What principles should be followed when adjusting the angle of the power trowel blade?

    The determination of the initial setting time of concrete and the entry timing of laser levelings are directly related to the quality, efficiency and cost of floor construction. Now I will provide you with a detailed analysis of these two core points. The "initial setting" of concrete is a physicochemical process, referring to a point in time when concrete begins to transform from a plastic state to a solid state, rather than a period of time. In terms of standards, the initial setting time refers to the period from the moment water is added and mixed until the concrete loses its fluidity and begins to set. Judgment methods and criteria This is the method stipulated in the national standard (GB/T 50080), which is usually carried out in the laboratory or at important construction sites. Method: Use a penetration resistance meter to penetrate the mortar screened out from the concrete mixture at a specified speed. When the penetration resistance reaches 3.5MPa, the corresponding time is the initial setting time. Advantages: The data is precise, objective and reliable. Disadvantages: It requires dedicated equipment, the operation is rather complicated, and it is not suitable for on-site rapid judgment. In actual construction, workers and technicians mainly rely on the following empirical methods to make judgments: Acupressure method (the most classic) : Apply a slight pressure to the concrete surface (usually with the thumb). The criterion for judgment: If, after pressing with a finger, a clear mark about 2-3 millimeters deep can be left on the surface, and the concrete is not sticky to the hand, with no obvious water marks or slurry overflow around, it is considered to have reached the initial setting state at this time. State analogy: It feels like moist clay or plasticine. Scratch method Make a mark on the concrete surface with a nail, a screwdriver or your finger. The criteria for judgment: The scratch marks are clear, the edges are neat, and the bottom of the scratch can maintain its shape and will not be quickly filled and healed by the slurry. Footprint method A person walks on the concrete and observes the footprints. Judgment criteria: The depth of the footprints should be around 5 to 10 millimeters, and there should be no obvious cracking or excessive bleeding around the footprints. Vibration rod insertion method Insert the small vibrator into the concrete and then pull it out. The criterion for judgment: The hole formed after being pulled out can basically remain in its original state and will not collapse and close rapidly. Important note: The on-site experience method requires construction personnel to have certain experience. The best practice is to make a comprehensive judgment by combining multiple methods and compare it with the estimated initial setting time provided by the laboratory. The entry timing of the laser leveling must be closely coordinated with the setting state of the concrete. Entering the market too early or too late can lead to serious problems. Question Sinking: The tracks or wheels of the leveling may get stuck in the concrete, causing deep ruts and disrupting the flatness. Bleeding: The equipment's rolling will force water and fine particles to float up, forming a surface slurry layer, which leads to dusting, sanding and insufficient strength in the later stage. The concrete cannot support the weight of the equipment, and the leveling head cannot be effectively leveled. Instead, it will disrupt the concrete. Condition description: The fingerprinting mark is very deep (>5mm), or the footprint is deeply sunken, and the scratch heals rapidly. Question Construction difficulties: The resistance of the leveling machine's movement is huge, the engine load is high, and it may even be unable to move. Poor surface quality: The flat head cannot effectively smooth out the already hardened surface, leaving marks of roughening and cracking, which damages the integrity of the surface. Poor joint: It cannot bond well with the subsequent poured concrete, resulting in cold joints. Ineffective compaction: The concrete has lost its plasticity, and the vibration of the leveled head cannot make it compact again. Condition description: There is almost no mark when pressed by finger, or a very strong force is needed to leave a shallow mark. The edge of the scratch will crack. The laser leveling should be put into operation when the concrete reaches the initial setting state, or slightly earlier than the initial setting (that is, close to the initial setting but not yet fully reached). Specific timing to grasp Core standard: When using the finger press method and the depth of the finger press impression is around 3-5mm, it is the best time for the leveling to enter the site. Operation process connection: The ideal construction process is: The preparatory processes: concrete spreading, initial vibration, and leveling with scraping bars have been completed. Wait for the right moment: Let the concrete stand naturally, bleed water and evaporate, gradually developing towards the initial setting state. During this period, workers can carry out manual operations such as edge and corner treatment. Judgment and entry: The construction supervisor continuously observes the condition of the concrete. Once it reaches the aforementioned "golden finger pressure standard", they immediately direct the laser leveling machine to enter the site. High-efficiency operation: The leveling, with its highly efficient functions of scraping, vibrating and leveling, can quickly complete large-scale operations when the concrete is still plastic but capable of supporting the weight of the equipment at its optimal state. Prediction is key: Before construction, it is necessary to understand the mix ratio of the concrete to be used and the estimated initial setting time measured in the laboratory (for example, at 20℃, the initial setting time of ordinary concrete is approximately 4 to 6 hours). This provides a time reference for on-site judgment. Environmental factors: Temperature, humidity and wind speed have a significant impact on the initial setting time. High temperature, strong wind and low humidity will shorten the initial setting time. It is necessary to prepare in advance to reduce the waiting time. Conversely, it will be extended. Personnel and Communication: A designated person (such as a foreman or technician) must be assigned to determine the initial setting time and maintain smooth communication with the equipment operator. It's better to arrive a little earlier than too late: When it's impossible to make an accurate judgment, entering the site a little earlier (the concrete is slightly softer) might just require dealing with the track indentations. However, if the entry is too late and the concrete becomes too hard, the quality problems caused are almost irreversible and the handling cost is extremely high. In short: When you "feel" the concrete with your hand and it feels like a moist and solid piece of clay, that's the best time for the laser leveling to shine. Accurately seizing this opportunity is the core technology for creating high-level and high-quality concrete floors. Note: The parameters provided in this document are for reference only and are not mandatory. Due to differences in technical characteristics between different brands and models of laser levelers, please consult the manufacturer for a suitable solution before actual operation. This reference document assumes no responsibility for any issues arising from failure to follow the manufacturer's instructions.    

Concrete construction is generally leveled manually, and the appearance of laser leveling machines completely liberates the inconvenience of manual operation. It greatly reduces the labor cost for the construction site, and has a significant improvement in the leveling effect of the concrete. Therefore, mechanized operations in this era can have a great impact on the construction industry. Concrete laser leveling is a scientific and reasonable design, and there is no need for manual assistance in the operation of the equipment, which is the convenience, science, technology, etc. in the design process. Of course, the laser leveling equipment used in different construction fields is different. Because the concrete laser leveling equipment has a variety of models and sizes in the production process, it has a wide range of uses. All of these need to improve the advantages and technical characteristics in this aspect during the leveling process, so as to be able to occupy an advantage in the industry and improve the brand characteristics. As in concrete laser leveling, it must be seen through the concrete construction process. This is the key to technological progress. It has full advantages and status in the field of various leveling and leveling equipment, and has been recognized and trusted by more builders, so it has been widely promoted in construction sites across the country. Issues that should be noted: (1) Due to the high construction efficiency, the later cutting must keep up. Generally, each laser leveling machine is equipped with 7-8 cutting machines to meet the requirements. (2) In the early stage, plastic film should be used for maintenance, and non-woven fabric should be covered after cutting. (3) During the construction process, due to the lateral pressure of the concrete, the steel mesh is easy to displace horizontally. For this reason, an isolation bench is placed directly on the adjacent steel mesh, so that the horizontal displacement of the steel mesh can be effectively controlled, and the bench can be used repeatedly. Advanced equipment such as laser leveling machines are especially suitable for projects such as docks, storage yards, expressways, airports, large squares, parking lots, and municipal roads that have relatively simple shapes, large amounts of action, and high construction quality requirements.       DETAIL   IMAGES      

◆  Daily inspection Routine inspections are key to ensuring that your concrete laser leveling is working properly and extending its service life. After each day's work is completed, the following inspections should be carried out on the leveling machine: 1. Check the engine oil level and coolant level to ensure sufficient oil and water. 2. Check whether the screws of each component are loose, and tighten them in time if they are loose. 3. Check whether the cable is damaged and replace it immediately if it is damaged. 4. Check whether wearing parts such as scrapers and laser transmitters are seriously worn. If they are severely worn, replace them in time. ◆ Regular cleaning Regular cleaning of the concrete laser leveling can prevent dirt and debris from causing damage to the equipment and improve the efficiency of the equipment. The leveling machine should be thoroughly cleaned once a week. Key cleaning areas include: 1. Engine: Use professional engine cleaner to clean to remove carbon deposits and sludge. 2. Laser transmitter: Wipe it with alcohol cotton to remove dust and fingerprints. 3. Scraper: Polish with sandpaper or replace with a new scraper 4. Cable: Wipe with dry cloth and keep dry ◆ Lubrication system The lubrication system of a concrete laser leveling is vital to the normal operation of the equipment. Equipment should be lubricated regularly. The lubrication parts include: 1. Use professional engine lubricating oil for the engine crankshaft, connecting rod and other parts. 2. Use professional grease for each bearing, chain and other parts 3. Regularly check whether there is any leakage in the lubrication system, and deal with it promptly if there is any leakage. ◆ Battery and charger The battery and charger of the compact soil laser leveler are the energy supply system of the equipment and require special attention and maintenance. Batteries and chargers should be checked regularly for the following: 1. Check the battery power and charge it in time if the power is insufficient. 2. Check whether the charger is working properly. If there is any problem, repair or replace it in time. 3. When the device is not used for a long time, the battery should be removed, stored separately and charged regularly to prevent battery damage. 4. Avoid using the battery at too high or too low temperature to prevent the battery from overheating or freezing. 5. Avoid over-discharging or charging the battery to prevent shortening of battery life. ◆ Replacement of wearing parts Some parts of the compact soil laser leveling machine are wearing parts and need to be replaced regularly to ensure the normal operation of the equipment and extend its service life. These wearing parts include: 1. Scraper: Replace regularly according to the degree of wear. It is recommended to replace it every 50 hours of work. 2. Filter: Replace regularly according to working conditions. It is generally recommended to replace it every 200 working hours. 3. Cable: If damaged, it should be replaced in time. It is generally recommended to replace it once a year. 4. Seals: If there are signs of aging, oil leakage, etc., they should be replaced in time. 5. Replacement of wearing parts should be carried out in accordance with the equipment manufacturer's recommendations, and original accessories should be used to ensure equipment performance and safety. ◆ Safety inspection Safety inspection is an important part of the maintenance of concrete laser leveling machine, which can ensure that the equipment will not cause accidents during work. The following safety checks should be performed on the equipment regularly: 1. Check whether the screws of each component are loose, especially the screws of the engine and important components. 2. Check whether the cable is damaged to prevent electric shock accidents. 3. Check the equipment for oil leakage to prevent fire accidents. 4. Check whether the lights and alarms of the equipment are working properly and ensure that the equipment can send out warning signals in time during work. 5. Check whether the emergency stop button of the equipment is working properly to ensure that the equipment can be stopped immediately in an emergency. 6. When conducting safety inspections, the equipment manufacturer's safety operating procedures and precautions should be followed to ensure the safety of the inspection process. If safety hazards are discovered, they should be dealt with promptly to prevent accidents.