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Large-area concrete laser leveling diamond wear-resistant floor and corrugated compartment joint anti-cracking construction method is a comprehensive floor construction method, which is explained in detail below: Ⅰ. Features of the method 1. High-precision leveling: – With the help of a concrete laser leveling machine, the operation is carried out based on the precise plane reference formed by the laser beam. The laser receiver feedbacks the deviation information in real time, and the leveling machine automatically and accurately adjusts the scraper height and vibration frequency to ensure that the floor flatness error can be controlled within a very small range, usually within ±2mm, providing a solid foundation for subsequent processes, especially suitable for precision manufacturing workshops, high-end storage facilities and other places with strict requirements on flatness. 2. Excellent wear resistance: – In the initial setting stage of concrete, diamond wear-resistant materials are evenly spread. With its high hardness and high strength, it is closely integrated with the surface of concrete. After smoothing and finishing, a solid and wear-resistant protective layer is formed, which greatly improves the wear resistance of the floor, effectively copes with high-intensity wear scenes such as heavy-loaded vehicles and frequent cargo handling, and significantly extends the service life of the floor. 3. Unique corrugated compartment joint design: – Abandoning the traditional straight compartment joint, the corrugated compartment joint is adopted. This design not only meets the needs of concrete expansion and contraction and prevents cracks, but also has a better stress dispersion effect than the straight joint, which can effectively reduce the risk of cracks caused by uneven foundation settlement and temperature changes. It can also add a unique visual beauty to the floor and enhance the overall image of the site. 4. High efficiency of construction: – All construction links are closely connected, from base treatment, concrete pouring, laser leveling, to wear-resistant material spreading, compartment joint setting and subsequent maintenance, all in one go and in an orderly manner. Laser leveling technology greatly improves the leveling efficiency. Compared with traditional manual leveling methods, the construction speed can be increased several times, which greatly shortens the overall construction period and reduces the project construction cost. Ⅱ. Scope of application It is widely used in various large-scale and high-load indoor and outdoor concrete floor projects, such as large industrial plants, logistics distribution centers, airport aprons, exhibition halls, port terminal cargo yards and other places, especially for projects with high requirements for floor flatness, wear resistance and crack resistance, and the expectation of a certain aesthetics. Ⅲ. Process principle 1. Laser leveling principle: – The laser transmitter releases a rotating laser beam to form a high-precision horizontal control surface. The laser receiver installed on the leveling machine continuously captures the laser signal, compares the real-time elevation of the floor with the laser reference surface, and transmits the generated deviation signal to the control system, prompting the hydraulic mechanism of the leveling machine to respond quickly, accurately control the scraper, vibrator and other components, and realize fast and accurate leveling and vibration of the concrete, achieving a high-precision leveling effect. 2. The wear-resistant principle of corundum: – When the concrete is in the initial setting state and the surface has a certain viscosity, the spread corundum particles can be embedded in the surface of the concrete. With the subsequent leveling and finishing operations, the corundum is deeply combined with the concrete. With its excellent hardness and wear resistance, it builds a solid defense line against wear on the concrete surface, protecting the main structure of the floor from friction loss in daily use. 3. The anti-cracking principle of the corrugated compartment joint: – Compared with the straight joint, the curved shape of the corrugated compartment joint can more effectively disperse the stress during the expansion and contraction of the concrete. When the concrete needs to expand and contract due to factors such as temperature rise and fall and foundation settlement, the corrugated joint guides the stress to disperse along the curve to avoid excessive stress concentration, thereby reducing the possibility of cracks and ensuring the integrity and stability of the floor. Ⅳ. Construction process and operation points 1. Construction preparation: – Technical preparation: Read the construction drawings in detail, clarify the technical requirements, prepare a rigorous construction plan, and organize construction personnel to conduct technical briefings. – Site preparation: Thoroughly clean up debris and accumulated water on the construction site, ensure that the base is flat, and take reinforcement measures for weak bases; reasonably plan the temporary drainage system for construction; design the concrete pouring and leveling route and the layout of the compartment joints according to the shape and area of ​​the site. – Material preparation: Strictly purchase high-quality cement, sand, admixtures, diamond wear-resistant materials, etc. according to design requirements, strictly inspect the raw materials to ensure that the quality meets the standards; prepare sufficient water and electricity for construction. – Equipment preparation: Comprehensively debug concrete laser leveling machines, concrete mixing equipment, transportation equipment, wear-resistant material spreaders, trowels, etc. to ensure that the equipment is in good operating condition; accurately calibrate the laser system to ensure that the emitted laser plane matches the floor design elevation. 2. Base treatment: – Deeply clean the base to remove dust, oil and other pollutants; compact the base with a roller or compacting machine, with a compaction degree of not less than 90%; use concrete or mortar to repair and level the local potholes and holes on the base, so that the base leveling error is controlled within ±10mm. 3. Concrete pouring: – Accurately weigh the raw materials according to the designed mix ratio, use a forced mixer to fully mix the concrete, and the mixing time is not less than 90 seconds to ensure the uniformity of the concrete; use pumping or self-unloading to transport the concrete to the construction area, control the pouring speed, prevent concrete segregation, and the pouring thickness should be slightly higher than the designed floor elevation by 10-20mm to reserve operating space for subsequent leveling. 4. Laser leveling: – Turn on the laser leveling machine and keep moving at a constant speed, usually controlled at 1-2m/min; the operator flexibly adjusts the scraper height and vibration frequency of the leveling machine in real time according to the signal fed back by the laser receiver to ensure that the concrete surface is flat and vibrated densely; the leveling work of adjacent areas must be completed before the initial setting of the concrete, and the overlapping construction width must be no less than 10cm to ensure the integrity of the floor. 5. Spreading of wear-resistant materials: – When the concrete is initially set (generally there are slight footprints when stepping on it, and the sinking depth is about 3-5mm), use a special spreader to evenly spread the diamond wear-resistant material on the floor surface according to the specified amount, and the spreading thickness is approximately 3-5mm; during the spreading process, the spreading speed and direction must be accurately controlled to prevent the accumulation or leakage of wear-resistant materials, and ensure that the spreading uniformity reaches more than 90%. 6. Smoothing and finishing: – After the wear-resistant material is spread, use the trowel to smooth it immediately. The trowel should be operated in a crisscross pattern to make the wear-resistant material fully blend with the concrete. The number of smoothing times should be no less than 3 times. As the concrete continues to harden, when there is no water stain on the surface and it feels slightly hard when pressed with fingers, it should be smoothed manually. Aluminum alloy rulers, trowels and other tools should be used to make the floor surface bright and smooth. 7. Corrugated compartment joint setting: – Before the concrete is finally set, according to the pre-designed compartment joint layout, a special mold or cutting equipment is used to make a corrugated compartment joint. The mold or cutting tool should ensure that the depth of the joint reaches 1/3 – 1/4 of the thickness of the concrete slab, and the joint width is controlled at 5 – 10mm. During the production process, the shape of the joint should be regular and smooth, and the anti-cracking and aesthetic functions of the compartment joint should be effectively exerted. 8. Maintenance: – After finishing and setting the compartment joints, the floor shall be maintained in time by covering with plastic film, spraying curing agent or laying water straw mats, etc. The maintenance time shall not be less than 7 days. During this period, the concrete surface must be kept moist to avoid cracks caused by water loss; warning signs shall be set up during the maintenance period, and vehicles and pedestrians are strictly prohibited from passing on the floor that does not meet the strength requirements. Ⅴ. Quality Control 1. Flatness Quality Control: – Before construction, use professional instruments to finely calibrate the laser system to ensure the accuracy of the laser plane; during the construction process, regularly use a 2m ruler and feeler gauge to check the flatness, at least once every 100-200 square meters, and adjust the leveler immediately if deviation is found; after finishing, use a laser flatness meter to comprehensively test the flatness of the floor to ensure that it meets the design requirements. 2. Wear-resistant performance quality control: – Select diamond abrasive wear-resistant materials strictly according to design requirements, and carefully check quality certification documents; in the spreading process, strengthen on-site supervision to ensure that the spreading amount and uniformity meet the standards; after maintenance, on-site wear resistance tests can be carried out, such as grinding a certain area with a grinding wheel, observing the wear condition, and judging whether the wear resistance meets the standards. 3. Partition seam quality control: – When making partition seams, strictly control the depth, width and shape of the seams, and use precise measuring tools for inspection; regularly inspect the partition seams to check whether there are debris blocking them. If problems are found, clean and repair them in time to ensure that the partition seams function normally. Ⅵ. Safety measures 1. Organize construction personnel to participate in safety training to familiarize them with the operating specifications and safety precautions of various construction equipment (such as laser leveling machines, concrete mixers, cutting equipment, etc.). 2. Set up safety warning signs in conspicuous locations on the construction site to clearly divide the construction area and non-construction area to prevent unrelated personnel from entering the construction danger zone. 3. Regularly conduct safety inspections on construction equipment, focusing on electrical insulation, mechanical protection devices, etc., to ensure the safe operation of equipment and prevent safety accidents caused by equipment failure. 4. Provide construction personnel with complete personal protective equipment, including safety helmets, safety shoes, gloves, etc., to ensure the personal safety of construction personnel. VII. Environmental Protection Measures 1. Classify and collect solid waste such as concrete residues and discarded diamond abrasive material packaging bags generated during the construction process, and regularly transport them to designated garbage disposal sites. 2. Reasonably plan construction time, avoid high-noise concrete mixing, equipment operation and other operations during residents' rest periods, and take noise reduction measures when necessary, such as installing silencers on equipment. 3. Strengthen the control of dust on construction sites, cover material storage sites, close transport vehicles, regularly sprinkle water to reduce dust, and maintain a clean environment on the construction site. Ⅷ. Benefit Analysis 1. Economic Benefit: – High-precision laser leveling combined with efficient construction process greatly shortens the construction period and reduces labor, equipment rental and other cost expenditures; diamond abrasive wear-resistant floor reduces the cost of later maintenance and floor replacement; corrugated compartment seams reduce the cost caused by crack repair, and the comprehensive economic benefits are significant. 2. Social Benefit: – Provide high-quality floor solutions for large-scale industrial, logistics and other projects to meet the needs of industry development; reduce construction noise, dust and other pollution, and help environmental protection and urban sustainable development. Ⅸ. Application Examples In a large automobile manufacturing plant construction project, this construction method was used, with a construction area of ​​more than 80,000 square meters. The floor flatness error is precisely controlled within ±1.5mm, meeting the requirements for the installation of precision equipment on the automobile production line; the diamond abrasive wear-resistant layer effectively resists the wear caused by the transportation of production equipment and vehicle driving; the corrugated compartment seams are beautiful and have no cracks, providing a solid guarantee for the efficient and stable operation of the plant, and have been highly praised by the owner. For example, in the renovation project of a busy port terminal cargo yard, this construction method also achieved remarkable results. A large area of ​​floor was quickly built with excellent wear and crack resistance, which met the high-intensity operation needs of the port and greatly improved the cargo yard operation efficiency.

The automated operation of concrete laser leveling machines usually relies on advanced control systems and sensor technologies, which together realize the intelligence and automation of the equipment. The following are some key technologies and methods to achieve automated operation: 1. Laser control system: Laser leveling machines use laser transmitters and receivers to ensure the best ground flatness by precisely controlling the height of the laser beam. This system can monitor and adjust the height of the leveling head in real time to ensure the flatness of the ground. 2. Sensors and actuators: The built-in sensors of the machine can monitor construction parameters such as the density and moisture of the concrete in real time, and the actuators automatically adjust the construction actions according to these parameters to ensure the construction quality. 3. Computer control system: The core components of the laser leveling machine include a high-strength integral frame and a microcomputer control system, which is responsible for controlling the upper and lower heights and the front and rear height balance of the leveling mechanism to ensure that the angle of the fuselage relative to the horizontal plane is fixed. 4. Automated construction process: The automated construction process includes a series of actions such as concrete paving, vibration, and leveling, which are completed by the laser leveling machine at one time, improving construction efficiency and ground density. 5. Remote control and monitoring system: Operators can remotely control the laser leveling machine through remote control equipment or monitoring system to achieve automated operation and reduce manual intervention. 6. Intelligent safety monitoring: Automated equipment is usually equipped with an intelligent safety monitoring system, which can timely detect safety hazards at the construction site through video monitoring and intelligent alarm system to ensure the safety of workers and on-site personsity. 7. Data analysis and optimization: By collecting construction data such as construction speed and concrete density, the system can analyze and optimize the construction process to further improve the effect of automated operation. Through the above technological innovations, the concrete laser leveling machine can achieve automated operation, improve construction efficiency and quality, and reduce labor costs and labor intensity.

Module title It is very important to ensure the safety and reliability of the concrete laser leveling machine during the construction process. This is not only related to the quality of the project, but also directly affects the safety of the operator. Here are some key steps and suggestions to ensure the safe and reliable operation of the concrete laser leveling machine: Preparation before operation 1. Training and certification: Ensure that all operators have received appropriate operation training and are familiar with all functions and emergency stop procedures of the equipment. 2. Equipment inspection: Before starting work every day, perform a comprehensive visual inspection of the leveling machine, including checking tires, fuel levels, oil, coolant, and all controls. 3. Laser calibration: Ensure that the laser transmitter is properly installed and calibrated to provide an accurate height reference. 4. Safety protection: Ensure that all safety devices such as emergency brake buttons, safety guardrails, etc. are in good condition. Construction site management 1. Site leveling: Before using the laser leveling machine, properly prepare the construction site to ensure that the ground is relatively flat and free of large debris. 2. Traffic control: Set up warning signs and fences to restrict unauthorized personnel from entering the work area. 3. Material supply: Rationally arrange the supply speed of concrete to avoid idling of equipment or pouring too quickly due to waiting for concrete, resulting in quality degradation. 4. Smooth communication: Ensure good communication means within the construction site to facilitate command and dispatch and emergency response. Precautions during operation 1. Smooth driving: The operator should maintain a constant speed and avoid sharp turns or sudden braking, which can improve flatness and reduce the risk of equipment damage. 2. Monitoring laser signals: Keep an eye on the working conditions of the laser receiver to ensure that a stable signal is received. 3. Timely adjustment: Adjust the scraper angle and vibration frequency according to the actual construction conditions to achieve the best effect. 4. Rest and inspection: Let the machine rest regularly and check the equipment condition again during this period. Daily maintenance 1. Regular maintenance: Perform routine maintenance tasks according to the manufacturer's recommended schedule, such as changing the engine oil and cleaning the filter. 2. Record keeping: Keeping detailed records of each maintenance helps track the historical performance of the equipment and predict possible problems in the future. 3. Professional repair: When encountering complex failures, please contact professional repair services instead of trying to repair them yourself. The above measures can greatly improve the safety and reliability of concrete laser leveling machines on the construction site. It is important to always follow the guidelines in the user manual provided by the manufacturer and comply with relevant local safety regulations

Technological innovation plays a vital role in improving the construction efficiency of concrete laser leveling machines. The following are some technological innovation directions that can be considered to improve construction efficiency and equipment performance: 1. Automation and intelligence: The introduction of automation and intelligent technologies, such as unmanned driving technology, can realize automated operation, reduce manpower requirements, and improve operation speed and accuracy. 2. High-precision measurement technology: The application of high-precision measurement technology, such as laser measurement and control system, can monitor and control the construction process in real time to ensure that each construction link meets the design requirements and quality standards. 3. Internet of Things Technology: The use of Internet of Things technology to achieve interconnection between equipment, remote monitoring and management of construction equipment, and improve equipment utilization and maintenance efficiency. 4. New material application: The use of new materials, such as high-performance concrete, can improve construction quality and reduce resource waste. 5. Energy-saving technology and renewable energy: The use of energy-saving technology and renewable energy can reduce energy consumption during construction. 6. Drone technology: Use drones for high-altitude surveys and monitoring to obtain accurate terrain and building information and improve logistics efficiency and accuracy. 7. BIM (Building Information Modeling) Technology: BIM technology can realize digital simulation of the entire life cycle of a building, conduct precise planning and design optimization before construction, and reduce changes and adjustments during construction. 8. Artificial Intelligence Monitoring: Use artificial intelligence to monitor various parameters in the construction process in real time, find problems in time and issue warnings to ensure construction safety and quality. 9. Equipment Monitoring and Maintenance: Through sensors and control systems, equipment can be monitored and maintained in real time, which reduces the occurrence of failures and improves equipment stability. 10. Construction Planning and Layout Optimization: Through reasonable construction planning and layout, the waste of land and water resources can be reduced and the project cost can be reduced. Through these technological innovations, the construction efficiency of concrete laser leveling machines can be significantly improved, construction costs can be reduced, and project quality can be improved.

1. Experimental research method – Flatness test experiment – Using level and tower ruler: On the ground after the concrete laser leveling machine is constructed, set measurement points at a certain interval (such as every 1 meter or 2 meters). Use the level and tower ruler to measure the elevation of each point, and then calculate the flatness indicators of the ground, such as maximum deviation, mean square error, etc. This method can intuitively evaluate the control ability of the leveling machine on the flatness of the ground. For example, in a factory floor construction project, the ground after the laser leveling machine is measured. If the maximum deviation is within the allowable range (such as within 3-5mm of the industrial floor flatness requirement), it means that its flatness performance is good. – Laser scanner: The laser scanner can quickly obtain three-dimensional data of a large area of ​​ground. Place the laser scanner in a suitable position, scan the ground after construction, and obtain the point cloud data of the ground. By processing these data with professional software, a three-dimensional model of the ground can be generated, and parameters such as the flatness and slope of the ground can be accurately calculated. Compared with levels and tower rulers, laser scanners are more efficient and can obtain more comprehensive data. – Strength test experiment – Concrete test block production and compression test: During the construction of the laser leveling machine, concrete test blocks are produced at the same time. The production conditions of these test blocks (such as concrete mix ratio, vibration method, etc.) should be consistent with the construction site. After the test blocks reach the specified curing period, the test blocks are tested for compressive strength using a pressure testing machine. By comparing the compressive strength of the test blocks with the design strength requirements, it is evaluated whether the construction process of the laser leveling machine has an impact on the strength of the concrete. For example, if the design requires the compressive strength of the concrete to be C30, after testing, the average compressive strength of the test blocks reaches or exceeds 30MPa, and the discreteness is small, indicating that the construction of the leveling machine has little effect on the strength and the performance is reliable. – Rebound Hammer Test: On the concrete surface after construction, a rebound test is performed using a rebound hammer. The rebound hammer infers the strength of the concrete by hitting the concrete surface and based on the rebound value. This method is easy to operate, and can be used to perform multi-point tests on a large area of ​​concrete surface to quickly evaluate the strength uniformity of the concrete. However, the results of the rebound test are affected by factors such as the surface quality of the concrete and the depth of carbonization, and need to be comprehensively judged in combination with methods such as the test block compression test. – Efficiency test experiment – Construction time record: In concrete construction projects of different scales (such as different areas and thicknesses), record the time it takes for the laser leveler to start construction and complete the leveling task. At the same time, record the pause time during the construction process (such as equipment failure maintenance, material supply interruption, etc.), and evaluate its construction efficiency by calculating the amount of work completed per unit time (such as square meters/hour). For example, in a 1,000 square meter ground construction, if the laser leveler completes the construction in 8 hours without any fault, its construction efficiency is 125 square meters/hour. – Comparative test: Compare the concrete laser leveler with the traditional leveling method (such as manual vibration, small mechanical vibration, etc.) under the same construction conditions (such as the same amount of concrete, the same site environment, etc.). Record the respective construction time, manpower input, energy consumption and other data, and highlight the efficiency advantage of the laser leveler through comparative analysis. 2. Data analysis tools – Statistical analysis software (such as SPSS, Excel advanced functions) – Data collation and descriptive statistics: Input the data obtained from the experimental test (such as flatness measurement value, strength test value, construction time, etc.) into the statistical analysis software. Use the data collation function of the software to clean and preprocess the data to remove outliers, etc. Then perform descriptive statistical analysis to calculate statistical indicators such as mean, standard deviation, maximum value, minimum value, etc. to understand the central trend and dispersion of the data. For example, through the Excel data analysis plug-in, calculate the mean and standard deviation of the flatness measurement data to intuitively display the overall situation and fluctuation range of the ground flatness. – Correlation analysis: When studying the relationship between different performance indicators of the laser leveling machine, such as between construction efficiency and flatness, between construction time and strength, etc., statistical analysis software can be used for correlation analysis. By calculating the correlation coefficient, it is determined whether the two indicators are positively correlated, negatively correlated, or unrelated. For example, if a negative correlation is found between construction time and flatness, that is, the shorter the construction time, the worse the flatness, the further analysis of the cause is needed. It may be that the construction speed is too fast and affects the leveling effect. – Professional engineering software (such as AutoCAD Civil 3D, Midas Gen) – 3D modeling and visualization analysis: Use software such as AutoCAD Civil 3D to import the ground 3D point cloud data obtained by the laser scanner to generate a high-precision ground 3D model. Through this model, you can intuitively view the flatness and slope of the ground, and perform virtual roaming and spatial analysis. For example, in concrete construction on complex terrain, the 3D model can accurately evaluate whether the laser leveling machine has completed the slope shaping of the ground according to the design requirements. – Structural analysis (for concrete structure performance): For situations involving concrete structure performance evaluation, such as the bearing capacity of large concrete slabs, use structural analysis software such as Midas Gen. Input the concrete structure parameters (such as thickness, strength, etc.) after the laser leveling machine is constructed into the software, and combined with the actual load conditions, structural mechanics analysis is performed to evaluate the safety and reliability of the structure. This kind of analysis is very important for some concrete projects with high requirements on bearing capacity (such as parking lots, industrial plant floors, etc.).

1. Technical innovation for high temperature climate – Intelligent temperature control system: – Develop an advanced intelligent temperature control system that can monitor the temperature of the engine, hydraulic system and key electrical components in real time. When the temperature approaches the critical value, the system automatically adjusts the working state of the equipment, such as reducing the engine speed or reducing the load of the hydraulic system to prevent overheating. For example, by installing a high-precision temperature sensor in the engine coolant circulation system, when the temperature reaches 90-95℃ (different equipment may vary slightly), the system automatically adjusts the speed of the cooling fan to speed up and enhance the heat dissipation effect. – The intelligent temperature control system can also be combined with remote monitoring technology to transmit the temperature data of the equipment to the operator's mobile device or control center in real time. In this way, even if the operator is not next to the equipment, he can understand the temperature of the equipment in time and take measures in advance, such as arranging equipment rest or adjusting the construction plan. – Application of high temperature resistant materials: – Use high temperature resistant sealing materials and lubricants in key parts of the engine and hydraulic system. For example, the use of high temperature resistant sealing materials such as fluororubber can effectively prevent leakage problems caused by aging and deformation of seals at high temperatures. At the same time, choose hydraulic oil with good high-temperature performance, which has a high flash point and oxidation stability, can maintain good performance in high-temperature environments, and reduce system failures caused by the decline of hydraulic oil performance. – For the outer surface of the equipment, use reflective heat-insulating coatings. This coating can reflect infrared and ultraviolet rays in sunlight and reduce the heat absorbed by the equipment. For example, nano-ceramic reflective heat-insulating coatings can effectively reduce the surface temperature of the equipment. In a high-temperature environment, the surface temperature of the equipment can be reduced by about 10-15℃. – Efficient heat dissipation structure design: – Optimize the heat dissipation structure of the equipment and increase the heat dissipation area and ventilation channel of the radiator. For example, a fin-type radiator design is used to increase the contact area with the air and improve the heat dissipation efficiency. At the same time, reasonable vents and air guides are designed on the equipment casing, and the natural wind or forced ventilation devices (such as fans) generated when the equipment is running are used to guide the cold air to flow through the key heating components and take away the heat. – For the hydraulic system, an independent hydraulic oil heat dissipation circuit is designed to dissipate the heat of the hydraulic oil through a special cooler. The cooler can be water-cooled or air-cooled, and can be flexibly selected according to the actual construction environment and equipment requirements. 2. Technical innovation for low temperature climate – Fast preheating technology: – Develop efficient engine preheating system, such as the combination of electric heating plug and intake preheater. The electric heating plug can directly heat the air in the engine cylinder, while the intake preheater preheats the cold air entering the engine. Before starting, the controller automatically starts the preheating program, which can preheat the engine to the appropriate starting temperature (such as 30-40℃) in a low temperature environment of -20℃ in just 5-8 minutes. – For hydraulic systems and working parts, use oil heating technology. Install heating devices, such as oil heaters, in the lubrication system of hydraulic oil tanks and working parts. Before starting the equipment, heat the hydraulic oil and lubricating oil to achieve the appropriate working viscosity, reduce the resistance when the equipment is started, and improve the starting efficiency of the equipment. – Optimization of low temperature adaptability components: – Design the battery for low temperature adaptability, such as using cold-resistant batteries or adding special electrolyte additives inside the battery to improve the discharge performance of the battery at low temperatures. At the same time, optimize the insulation structure of the battery, wrap the battery with insulation materials to reduce heat loss. – Choose tire or track materials suitable for low temperature environment. At low temperatures, ordinary rubber will become hard and brittle, affecting the driving performance and comfort of the equipment. Using cold-resistant rubber materials to make tires or tracks can ensure good elasticity and grip in low temperature environments. – Automatic snow and ice removal function: – Equip the equipment with automated snow and ice removal devices. For example, heating wires are installed on the working parts of the equipment such as scrapers and spiral spreaders. When the equipment is started, the heating wires automatically work to melt the snow and ice on the working parts to prevent them from affecting the normal operation of the working parts. – Set up a small snow blowing device around the walking device (tires or tracks) of the equipment, and use compressed air or fans to blow the snow away from the walking device to ensure that the equipment can travel normally on snowy or icy roads. 3. Technical innovation for humid climates – Upgrade of waterproof sealing technology: – Adopt higher-level waterproof sealing technology, such as IP67 or IP68 level sealing standards (IP level is the international code used to identify the protection level, and the larger the number, the higher the protection level). For key components such as electrical control cabinets and motors, use sealing rubber rings, sealing pads and sealants for multiple sealing to prevent water, dust and moisture from entering. – Develop waterproof and breathable membranes to cover the vents and parts of the equipment that may be flooded. This membrane allows air to circulate but prevents water from entering, balancing the air pressure inside the equipment while keeping the equipment dry. For example, using a waterproof and breathable membrane on the housing of the laser transmitter and receiver can prevent water from entering without affecting the transmission of the signal. – Dehumidification and drying system: – Install a dehumidification and drying system that can dehumidify the air inside the equipment using desiccant or the principle of refrigeration and dehumidification. For example, a small dehumidifier is installed in the cab or electrical control cabinet of the equipment. When the humidity sensor detects that the air humidity exceeds the set value (such as 70% – 80%), the dehumidifier automatically works to reduce the air humidity to an appropriate range. – For hydraulic systems and lubricating oil systems, vacuum drying technology is used. During equipment maintenance, the water in the system is extracted by a vacuum pump to ensure the dryness and purity of the oil and extend the service life of the oil. – Intelligent monitoring and protection against rust: – Develop an intelligent monitoring system for anti-rust, and monitor the rust of components in real time by installing corrosion sensors on key metal components of the equipment. The sensor can detect parameters such as humidity, salinity and pH on the metal surface. When these parameters reach critical values ​​that may cause rust, the system will sound an alarm. – Based on the monitoring data, a device for intelligently spraying rust inhibitors is used. When the system determines that rust prevention treatment is required, it automatically sprays rust inhibitors on the parts that may rust, or protects the metal parts of the equipment through electrochemical protection methods, such as cathodic protection technology, to prevent rust.

1. Under high temperature climate conditions – Cooling system maintenance: – Under high temperature environment, the engine (if it is a fuel laser leveler) and hydraulic system are prone to overheating. For the engine, make sure that the coolant in the radiator is sufficient and clean. The coolant level should be checked regularly, generally every 8-10 hours of work, and the coolant should be replaced regularly according to the requirements of the equipment manual. It is usually recommended to replace it once a year. – Clean the dust and debris on the surface of the radiator, as these will affect the heat dissipation effect. You can use a compressed air can or a soft brush to gently clean it to avoid damaging the radiator fins. – For the hydraulic system, some laser levelers are equipped with a hydraulic oil cooler. Also ensure that its surface is clean and pay attention to the temperature of the hydraulic oil. If the hydraulic oil temperature is too high, it may cause the performance of the hydraulic system to decline or even damage. – Equipment working time adjustment: – Try to avoid using the equipment for a long time when the temperature is highest during the day (usually 12 noon-3 pm). Because during the high temperature period, the operating temperature of each component of the equipment is already high, and long-term continuous operation will further aggravate heat accumulation and increase the risk of equipment failure. – The working time can be adjusted to the early morning or evening, when the ambient temperature is relatively low, which is conducive to the normal operation of the equipment. If it is unavoidable to work during high temperature periods, the rest frequency of the equipment should be increased. After every 1-2 hours of work, the equipment should be allowed to rest for 15-20 minutes to allow the various parts of the equipment to fully dissipate heat. – Lubrication and seal inspection: – High temperature will accelerate the evaporation and aging of lubricating oil (grease), so the lubrication of the equipment should be checked more frequently. For example, for the bearings, chains and other parts of the equipment, lubrication may be performed once every 50-100 hours of work. In a high temperature environment, it is necessary to check and add grease every 30-50 hours of work. – At the same time, check the seals of the equipment, such as the seals at the joints of the hydraulic pipes and the engine oil seals. High temperature may cause the seals to age and deform, resulting in leakage. If the seals show signs of damage, they should be replaced in time to avoid leakage of hydraulic oil or coolant, which will affect the normal operation of the equipment. 2. Under low temperature climate conditions – Fuel and battery management: – For fuel-type laser levelers, use fuel suitable for low temperature environments. In cold weather, diesel may wax, which will affect the start and normal operation of the engine. You can add anticoagulants or use low-grade winter diesel to solve this problem. – Battery performance will decrease at low temperatures, so make sure the battery is fully charged. When the equipment is not in use, the battery can be removed and placed in a warm room for charging and storage. In addition, before starting the equipment, the battery can be preheated, such as using a battery heater, which can improve the battery's starting ability. – Preheating before starting: – The engine should be fully preheated before starting. According to the requirements of the equipment manual, use a preheating device to preheat the engine. The preheating time is generally determined by the ambient temperature. For example, in an environment of about minus 10℃, the preheating time may take 10-15 minutes. – For the hydraulic system and working parts, do not let the equipment work at full load immediately after starting. Let the equipment run at no load for 5-10 minutes to gradually heat up the hydraulic oil and various components. After reaching the normal working temperature, start construction. – Precautions for equipment storage: – If the equipment is not used for a long time, it should be stored indoors or in a place with insulation measures to avoid exposure to cold outdoor environments. If it can only be stored outdoors, the equipment should be properly covered to prevent damage to the equipment caused by snow and ice. – Antifreeze can be added to the water tank and hydraulic oil tank of the equipment to prevent the water tank and oil tank from freezing and cracking at low temperatures. The amount of antifreeze added should be in accordance with the requirements of the equipment manual. Generally, the concentration of antifreeze should be ensured to effectively prevent freezing at the expected minimum temperature. 3. Under humid climate conditions – Waterproof and moisture-proof measures: – Check the electrical system of the equipment to ensure that all electrical components (such as motors, controllers, sensors, etc.) have good waterproof seals. For wire connectors exposed to the outside, waterproof tape or sealant can be used to wrap them to prevent moisture from entering and causing short circuits. – The laser transmitter and receiver of the laser leveling machine should also be waterproof. In humid weather, if these precision components are damp, it may affect the transmission and reception of laser signals, thereby affecting the construction accuracy. You can use a special waterproof cover to protect it. When the equipment is not in use, store these parts in a dry place. – Rust-proof treatment: – Humid air can easily cause equipment to rust, especially the metal parts of the equipment. Anti-rust oil or anti-rust paint can be applied to the surface of the equipment, and the parts that are prone to rust (such as chassis, scrapers, screws, etc.) should be protected. – Regularly check whether the equipment has signs of rust. For rusted parts, rust removal should be carried out in time. You can use sandpaper or rust remover to remove the rust, and then apply anti-rust oil or touch-up paint. – Post-work drying treatment: – After working in humid weather, the equipment should be cleaned and dried in time. Use a clean rag to wipe off the moisture on the surface of the equipment. For parts inside the equipment that may be damp (such as the cab, electrical control cabinet, etc.), a hair dryer or dehumidifier can be used to dry them. – At the same time, the working parts of the equipment (such as scrapers, spiral distributors, etc.) should be cleaned to prevent concrete residues and moisture from mixing and solidifying on the parts, affecting the next use of the equipment.

In addition to improving construction quality and efficiency, concrete laser leveling machines also have the following potential industrial application advantages: 1. High-precision control and data recording – High-precision control: – Laser leveling machines can achieve high-precision ground leveling at the millimeter level. In some industrial sites with extremely high requirements for flatness, such as electronic chip manufacturing plants, precision instrument production workshops, etc., the ground flatness can be accurately controlled to provide a stable foundation for the installation and operation of high-precision equipment. For example, in chip manufacturing workshops, the ground flatness error is required to be controlled within ±1-2mm, and laser leveling machines can meet this requirement well. – Its precise control system can automatically level through laser guidance, and operators can accurately set the leveling machine according to specific construction requirements, such as slope, elevation, etc. This is very important for building industrial sites with drainage slopes (such as open-air production areas of chemical companies) or storage areas where elevation needs to be precisely controlled (such as automated stereoscopic warehouses). – Data recording and analysis: – Modern advanced laser leveling machines are usually equipped with data recording functions, which can record various parameters during the leveling process, such as flatness data, slope changes, construction area, etc. These data are very valuable for quality control and subsequent site evaluation. For example, after the construction of a large logistics warehouse, the data can be analyzed to verify whether the ground meets the design standards and provide a reference for later ground maintenance and renovation. – Data can also be used to optimize the construction process. By analyzing multiple construction data, the construction team can find out the bottleneck links in the construction process, adjust the operating parameters of the leveling machine, and improve the overall efficiency and quality of the construction. 2. Reduce labor costs and labor intensity – Reduce labor input: – Compared with traditional manual leveling methods, laser leveling machines can greatly reduce the number of manual workers. A laser leveling machine can replace the work of multiple skilled workers to a certain extent, especially in large-scale industrial floor construction, this advantage is more obvious. For example, in the construction of an industrial plant floor of thousands of square meters, the use of a laser leveling machine may only require 2-3 operators, while the traditional method may require 10-15 workers. – With the continuous increase in labor costs, the use of laser leveling machines can effectively reduce the proportion of labor costs in the entire construction cost and improve the economic benefits of construction companies. At the same time, reducing manual operations also reduces the probability of construction quality problems caused by human factors. – Reducing labor intensity: – It is relatively easy to operate a laser leveling machine. The operator is mainly responsible for controlling the basic operations such as the direction and speed of the machine. There is no need to perform heavy physical labor like traditional construction, such as bending over for a long time with tools such as shovels and scrapers. This helps to improve the operator's work comfort and reduce the risk of occupational diseases caused by long-term high-intensity physical labor. 3. Adapt to a variety of complex working conditions – Complex terrain processing: – Concrete laser leveling machines can adapt to different terrain conditions. Whether it is a complex column grid layout indoors, an irregularly shaped industrial site, or an outdoor site with a certain slope change, it can be flexibly constructed. It can adapt to terrain changes by adjusting its own working mode (such as changing the scraper angle, vibration frequency, etc.). For example, in an industrial plant with multiple equipment foundations, the laser leveler can operate flexibly around the foundation to ensure the integrity and flatness of the ground. – For some renovation projects of old industrial sites, the ground may be uneven, with old foundation residues and other complex conditions. The laser leveler can use its powerful power system and working parts to effectively handle these complex grounds and create good conditions for new ground construction. – Adaptability to harsh environments: – In some industrial environments, there may be harsh conditions such as heavy dust, high temperature or chemical corrosion risks. The design of the laser leveler usually takes these factors into consideration. The body shell can be made of corrosion-resistant materials, and the engine and electrical system also have corresponding protection measures. For example, in the ground construction of chemical enterprises, the laser leveler can resist a certain degree of chemical corrosion to ensure the normal operation of the equipment.

The following is a detailed method for daily maintenance of the concrete laser leveling machine to ensure its long-term stable operation: 1. Inspection before work – Appearance inspection: – Carefully check whether the appearance of the equipment has signs of damage, such as whether the fuselage has cracks or deformation, especially whether the shell of the laser receiver and transmitter is intact. Because these parts are relatively delicate, damage to the shell may affect their performance. – Check the condition of the tires (if it is a wheeled leveling machine) or the crawler (if it is a crawler leveling machine), check whether the tires have obvious wear and scratches or whether the air pressure is normal (the tire pressure should generally be kept within a certain range as required by the equipment manual, such as 3-4 atmospheres); whether the crawler has loose or broken links, etc. – Connection parts inspection: – Check whether the bolts and nuts at each connection are tightened. Focus on checking the connection between the working parts such as scrapers and spiral feeders and the fuselage, because these parts will generate greater vibration and force during work, and loose bolts may cause parts to fall off or work abnormally. You can use a wrench to properly tighten the bolts at key locations. – Check whether the connection between the hydraulic and electrical lines is good. Make sure that there is no leakage in the hydraulic lines and there should be no oil stains on the pipe joints; the plugs and sockets of the electrical lines should be tightly connected, and the wires should not be damaged or aged. 2. Precautions during work – Operation specifications: – Operate strictly in accordance with the operating manual and avoid sudden acceleration, sudden braking or oversteering. For example, during the movement of the leveler, the speed should be controlled smoothly to avoid sudden changes in speed that cause the machine to vibrate violently, which may damage the internal structure of the machine and the laser calibration system. – Pay attention to the working status of the equipment, including the sound and temperature of the engine (if it is a fuel type) or the motor (if it is an electric type), as well as the operation of each working part (such as scraper, distributor, vibrator, etc.). If abnormal sounds (such as sharp friction sounds, impact sounds) or working parts shake or stagnate, stop the operation immediately and check the cause. – Laser system maintenance: – Make sure the lenses of the laser transmitter and receiver are clean. In the case of a bad working environment (such as dust, mortar splashing, etc.), the lens should be cleaned regularly. You can use a clean, soft, wet cloth to gently wipe the lens surface to avoid scratching the lens. – Pay attention to the strength and stability of the laser signal. If the laser signal is found to be interrupted or unstable, it may be due to the position of the transmitter or receiver being offset, the battery being low (for portable laser equipment), or being interfered with by the outside world. The position of the equipment should be adjusted in time, the battery should be replaced, or the interference source should be eliminated. 3. Cleaning and maintenance after work – Cleaning the body: – After each work, use a high-pressure water gun (be careful not to use too high a pressure to avoid damaging the equipment) or a soft brush, wet cloth and other tools to remove concrete residues, dust and other debris from the surface of the equipment. For hardened concrete that is difficult to remove, a special cleaning agent can be used for cleaning. – Focus on cleaning working parts, such as scrapers, blades of spiral feeders, etc., to ensure that there is no concrete residue on these parts to avoid affecting the accuracy and efficiency of the next work. At the same time, clean the bottom of the body to prevent the residual concrete from solidifying during the parking process of the equipment, affecting the normal placement of the equipment and the next start-up. – Lubrication and maintenance: – Lubricate key parts regularly according to the frequency of use and working intensity of the equipment. For example, the bearings, joints, chains (if any), etc. of the equipment should use appropriate lubricants (such as lithium-based grease). Generally, a simple lubrication check is performed every 8-10 working hours, and a comprehensive lubrication is performed every 50-100 working hours. – For the hydraulic system, check the oil level and oil quality of the hydraulic oil. The oil level should be kept within the specified scale range of the hydraulic oil tank. If the oil level is too low, a qualified hydraulic oil of the same model should be added; at the same time, observe the color and transparency of the hydraulic oil. If the hydraulic oil is found to be black, turbid or has a peculiar smell, it may be that the hydraulic oil is contaminated or aged. The hydraulic oil should be replaced in time. It is generally recommended to replace the hydraulic oil every 1000-1500 hours. – Storage environment: – Store the equipment in a dry and well-ventilated indoor environment to prevent the equipment from getting damp and rusting. If it can only be stored outdoors, the equipment should be covered with a waterproof cloth to prevent rain, dew, etc. from corroding the equipment. – During the storage period, the scraper, spreader and other working parts of the equipment can be raised to make the tires or tracks a certain distance from the ground (such as using blocks to raise them). This can reduce the pressure of the equipment's own weight on the tires, tracks and chassis and extend the service life of these parts. At the same time, disconnect the power supply of the equipment (if it is an electric equipment) or close the fuel valve (if it is a fuel equipment), and remove the battery (if it is easy to remove) to prevent battery leakage or fuel leakage.

Electric concrete trowels and gasoline-powered trowels each have their own advantages and disadvantages, and which one to choose depends on the specific application scenario and personal needs. Advantages of electric concrete trowels: 1. No emissions: Electric motors do not produce exhaust gases, making them suitable for use indoors or in enclosed spaces. 2. Low noise: Electric motors produce less noise than gasoline engines. 3. Easy to maintain: No complex fuel system, reducing the need for maintenance. 4. Cost-effective: In the long run, electricity may cost less than gasoline, and motors generally have longer life. 5. Instant start: No preheating or throttle adjustment is required like with gasoline engines. Disadvantages of electric concrete trowels: 1. Power limitation: Relying on a power outlet or battery, the working range is limited by the length of the cable or the battery life. 2. Power limitation: For large projects or occasions where long-term continuous work is required, electric motors may not provide as much power as internal combustion engines. Advantages of gasoline-powered trowels: 1. High flexibility: No need to connect the power cord, it can be freely moved and used in places far away from the power supply. 2. High power output: Suitable for larger scale or thicker concrete surface treatment. 3. Strong applicability: Especially suitable for outdoor work, not affected by power supply conditions. Disadvantages of gasoline-powered trowels: 1. Emission problems: It will produce exhaust gas and is not suitable for long-term use in a closed environment. 2. High noise: The noise generated during work is more obvious than that of electric models. 3. Complex maintenance: The fuel system needs to be maintained regularly, and pay attention to draining the fuel during storage to prevent oxidation and deterioration. 4. Trouble starting: Sometimes you need to pull the rope to start, which may add some inconvenience. In summary, if you mainly work indoors or in an environmentally friendly environment, you can choose an electric trowel; if your construction site changes frequently, or if you are doing large-scale construction outdoors, then a gasoline-powered trowel may be a better choice. Considering your area, decide the most suitable type of equipment based on the local power supply and specific construction conditions.

The dimensions of a concrete trowel (also called a concrete screed or concrete leveler) can vary by manufacturer and model, but here are some common ranges: 1. Working width: The working width of a trowel is usually between 60cm and 1.2m. Wider machines are suitable for large areas, while narrower machines are suitable for small or confined areas. 2. Blade diameter: The blade diameter of a trowel is generally between 600mm and 1200mm, which is used to ensure the flatness of the ground. 3. Machine length: The length of a trowel is usually between 1.5m and 2.5m, which affects the machine's operational flexibility and ease of transportation. 4. Machine height: The height of a trowel is usually adjustable, with an adjustment range of approximately 70cm to 110cm to suit different construction needs. 5. Weight: The weight of a trowel can range from 100kg to 300kg, with heavier machines generally providing better compaction. 6. Engine power: The engine power of the trowel can range from 5 horsepower to 20 horsepower or more, depending on the size of the machine and the construction requirements. 7. Fuel tank capacity: The fuel tank capacity is usually between 20 liters and 40 liters, which determines the working time of the machine between refueling. 8. Water tank capacity: For trowels with a water cooling system, the water tank capacity may be between 20 liters and 60 liters. 9. Operating handle length: The length of the operating handle is usually between 1.2 meters and 1.8 meters to provide a comfortable operating experience. 10. Number of blades: Some trowels may be equipped with multiple blades to improve work efficiency. Please note that these specifications are for reference only, and the specific size should be determined according to the actual construction needs and the model provided by the manufacturer. When choosing a trowel, factors such as the construction environment, construction area, ground type, and required flatness should be considered.

The quality of concrete trowels can be judged from the following aspects: 1. Power system – Engine: – If it is a fuel engine, a high-quality engine starts quickly. Under normal temperature conditions (such as 10-35 degrees Celsius), it should be able to start within 3-5 seconds after pulling the starter rope or pressing the electric start button. For example, brands such as Honda and Briggs & Stratton have a good reputation, reliable quality, strong and stable power. – The engine should be stable during operation, without obvious shaking and abnormal noise. You can judge by observing the vibration of the body when the trowel is working. If the vibration is too severe, it may be caused by unreasonable installation or poor quality of the internal parts of the engine. – The power must meet the use requirements. Generally, the power of the trowel used for small indoor floor construction may be around 3-5 horsepower, while the power of the trowel used for large-area outdoor projects may reach 7-10 horsepower or even higher. Insufficient power will lead to low trowel efficiency, while excessive power may cause energy waste and increase the difficulty of operation. – Motor (if it is an electric trowel): – Check the brand and parameters of the motor. High-quality motors are usually more efficient and can effectively use electrical energy. For example, motors from brands such as Siemens in Germany and Wolong in China have certain quality guarantees. – The insulation performance of the motor should be good to prevent leakage accidents. You can check the protection level mark of the motor. Generally, it is required to reach IP44 and above, which means that the motor can prevent the entry of solid foreign objects larger than 1mm and can prevent water splashing. – The motor heats up normally during operation and will not overheat. After working continuously for 1-2 hours, touch the motor housing with your hand and feel that the temperature is not hot (the temperature does not exceed about 70-80 degrees Celsius). If the motor overheats, it may shorten the life of the motor or even damage the motor. 2. Chassis part – Chassis material: – High-quality trowel chassis are usually made of high-strength aluminum alloy or high-quality steel. Aluminum alloy chassis is light, corrosion-resistant, easy to operate and has a long service life; steel chassis is strong and can withstand greater pressure. For example, some high-end brands of trowel chassis are made of aviation aluminum alloy, which is strong and light. – The thickness of the chassis is also an important factor. Thicker chassis (generally around 4-6mm thick) are more wear-resistant and less likely to deform. You can judge whether the thickness of the chassis meets the requirements by simple measurement or comparison with other brands. – Chassis flatness: – The surface of the chassis should be very flat and smooth, and the flatness error should be controlled within ±0.5mm. This can be preliminarily judged by naked eye observation and hand touch. A more accurate method is to use tools such as a level to measure. If the chassis is not flat, the ground flatness will be poor and uneven during the troweling process. 3. Trowel blade – Blade material: – The blade is generally made of high-hardness alloy steel, which has good wear resistance and toughness. For example, 65Mn alloy steel blades are hard and not easy to break. You can check the product manual or consult the manufacturer to understand the blade material. – High-quality blades undergo heat treatment processes such as quenching to improve their hardness and wear resistance. The surface hardness generally reaches around HRC50-60, which allows the blade to maintain good shape and performance after long-term friction with the concrete surface. – Number and layout of blades: – The number of trowel blades varies depending on the size and purpose of the trowel. Generally, small trowels have 4-6 blades, and large trowels may have 8-10 or more. The blade layout should be reasonable to ensure that the ground is fully and evenly troweled during work. For example, the blades are symmetrically distributed around the chassis, and the spacing between adjacent blades is uniform to avoid troweling dead corners. 4. Operation comfort – Armrest design: – The height of the armrest should be moderate, generally around 80-100cm, so that operators of different heights can hold it easily. The handrail material should have good anti-slip properties, such as rubber-wrapped metal handrails, so that the hand is not easy to slip during operation, improving the safety of operation. – The handrail should be able to flexibly adjust the angle to adapt to different operating postures and working scenes. For example, when operating in a narrow space such as a corner, the handrail can be adjusted to a suitable angle for easy operation. – Whole machine weight and balance: – The weight of the trowel should be moderate. Too light may cause the machine to have poor stability and easy to jump during operation; too heavy will increase the difficulty of operation. Generally, the weight of a small hand-held trowel is about 60-100kg, and the weight of a ride-on trowel may be about 200-300kg. – The center of gravity of the machine is reasonably designed to ensure good balance during operation. It can be judged by actual operation or observing the state of the machine at work. If the machine is easy to tip over or one side is heavy, it means that the balance is not good. 5. Safety performance – Protective device: – The trowel should be equipped with complete protective devices, such as emergency brakes. In case of emergencies, the operator can quickly stop the machine. The brake device should be sensitive and reliable, with a short braking distance. Generally, when the machine is running at full speed, the machine should stop rotating within 2-3 seconds after pressing the brake button. – Rotating parts (such as blades) should have protective covers, which should be firm and reliable to prevent operators from accidentally touching the high-speed rotating blades. The material of the protective cover is generally metal or high-strength plastic, and there should be obvious warning signs on the protective cover. – Electrical safety (for electric trowel machines): – In addition to the motor insulation performance mentioned above, the power cord of the electric trowel machine should have a good insulation layer and a moderate length, generally about 5-10m, which is convenient for operation and will not be too long to cause safety hazards. – The machine should have a grounding device to prevent leakage accidents. The grounding resistance must meet the standard requirements and generally does not exceed 4 ohms. 6. Brand and after-sales service – Brand reputation: – Choose a well-known brand of trowel machines, which usually have a strict production quality control system and a good reputation. – After-sales service: – Good after-sales service is an important guarantee of quality. Manufacturers should be able to provide timely technical support, such as maintenance manuals, operation videos and other materials. And when the product fails, they can provide fast maintenance services, including the supply of parts and door-to-door service by maintenance personnel. The maintenance outlets are widely distributed, which is convenient for users to contact manufacturers or maintenance personnel in time when needed.