Grade of strength of concrete

    The engine is the "heart" of the leveling machine. Proper maintenance is of vital importance, which can effectively extend the service life of the equipment, ensure construction efficiency and reduce maintenance costs. The following is a detailed summary of the key points for engine maintenance and the oil change cycle for you Maintenance work can be divided into three parts: daily maintenance, weekly/monthly maintenance and long-term storage maintenance. Machine inspection: Before starting, run the machine once to check for oil or water leakage and whether any components are loose or damaged. Check the engine oil level Park the machine on a level ground, turn off the engine and let it stand for 10 to 15 minutes to allow the engine oil to flow back to the oil pan. Pull out the oil dipstick, wipe it clean with a clean cloth, insert it again and pull it out. Check if the oil level is between the "upper limit" (FULL/Max) and "lower limit" (LOW/Min) marks on the dipstick. When insufficient, it should be added to the upper limit position, but must not exceed. Check the coolant level When the engine is cooling, check whether the water level in the expansion tank is between the "FULL" and "LOW" marks. If it is too low, add the same brand and model of antifreeze coolant. Do not directly add tap water to avoid the formation of scale and rust. Check the air filter Check the vacuum indicator on the air filter housing. If the indicator window turns red, it indicates that the filter element is clogged and needs to be cleaned or replaced immediately. In construction sites with extremely high levels of dust, the air filter elements should be cleaned every day or even after each shift. Check the fuel system Check the fuel level in the fuel tank and replenish it in time. Open the water drain valve of the fuel filter to drain the accumulated water and impurities at the bottom. (For oil-water separators with manual pumps, pump the oil to release air first and then drain the water.) Clean the machine: After the operation is completed, promptly clean the cement, dust and debris on the engine surface and radiator to ensure good heat dissipation. Change the engine oil and oil filter: For details, see Part Two. Clean/Replace the air filter Remove the filter element and repeatedly blow and wash it from the inside out with low-pressure compressed air (pressure < 0.5MPa). Do not strike the filter element. If the filter element is damaged, severely contaminated with oil or the indicator still alarms after cleaning, it must be replaced immediately. Replace the fuel filter It is usually replaced every 250 to 500 hours. After replacement, be sure to expel all the air in the fuel line to ensure a smooth start. Check and tighten the fan belt Check if the belt has any cracks or wear. Press the middle of the belt with your finger. The deflection (downward pressure distance) should be between 10 and 15mm. Both being too loose and too tight will affect the normal operation of the water pump and fan. Check the battery Check whether the battery terminals are securely fastened and free from corrosion (vaseline can be applied for protection), and whether the electrolyte level is normal (this operation is not required for maintenance-free batteries). This is a question without a fixed number of days for the answer. The optimal cycle depends on the "engine working hours" and the "working environment". Primary reference: Equipment user manual The maintenance cycles of engines of different brands and models vary. Please be sure to refer to the "User and Maintenance Manual" of the equipment you purchased. This is the most authoritative basis. General reference standard Standard operating conditions: If your leveling machine operates in an environment with little dust and normal load, the general replacement cycle is every 200 to 250 working hours. Harsh working conditions: If your equipment operates for a long time in the following environments, the replacement cycle should be shortened to 150 hours or even shorter: High-dust environments: such as cement grinding and construction sites with heavy sand and dust, dust can accelerate the deterioration of engine oil. Continuous heavy-load operation: Long-term high-intensity leveling. Frequent starts and stops. How to determine if the engine oil needs to be changed? Dipstick observation method: Near the replacement cycle, pull out the dipstick and drop a drop of engine oil onto a white paper towel. Observe the situation after the oil droplets have spread: The color of the central oil ring: If it is dark black and contains many impurities, it indicates that the engine oil is severely dirty. Diffusion ring boundary: If the boundary is unclear and there is no obvious three-layer diffusion ring, it indicates that the dispersibility of the engine oil has declined. The hand feel method: Rub the engine oil with your fingers. If you feel a distinct granular sensation or it loses its stickiness and smoothness, it indicates that there are too many impurities or it has lost its effectiveness. Important Notice The engine oil and filter must be replaced simultaneously! If only the engine oil is changed but the oil filter is not, the dirty oil in the old oil filter will quickly contaminate the new oil. Use the specified grade of engine oil: According to the season and local temperature, select the CF-4, CH-4 or higher grade diesel engine oil recommended in the manual. If the equipment is planned to be parked for more than one month, the following measures should be taken: Drain all the coolant and engine oil from the engine. Inject approximately 15ml of clean engine oil into each cylinder through the intake port and rotate the crankshaft several times to form an oil film on the inner walls of the cylinders for rust prevention. Fill the fuel tank to the brim to prevent condensation of water droplets and disconnect the negative terminal of the battery. Clean the entire machine thoroughly and park it in a dry and well-ventilated room. For the engine maintenance of diesel concrete laser leveling machines, please keep in mind: Regular inspection: Daily checks of oil, water and air are the foundation. Regular replacement: Follow the instructions and replace the engine oil, oil filter, fuel filter and air filter regularly according to the working hours. Under standard operating conditions, changing the engine oil and oil filter every 200 to 250 hours is a safe reference value. Heavy environmental conditions: Under harsh working conditions, the maintenance cycle should be shortened. Use genuine products: Use genuine oil products and filter elements that meet the specifications. By developing good maintenance habits, your equipment will be able to serve you for a longer time and more efficiently.   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.    

For large-scale industrial plants, the quality of concrete floor construction directly affects the normal production. Therefore, the floors of industrial plants now generally require special bearing capacity, anti-slip wear resistance, and flatness. Through practical research, we found that in the construction of steel fiber concrete wear-resistant ground in industrial plants, using a wider range of concrete laser leveling/ leveling machines for leveling, coupled with driving double-disc trowels for ground finishing, can Greatly improve the construction quality and speed of the floor. The following briefly introduces the characteristics, principles, processes and benefits of the construction of the concrete laser leveling/ leveling machine + car troweling machine. ◤Construction method characteristics◥: ◆ Higher construction quality: The floor elevation can reach laser-level precision, and the ground flatness and levelness are more than three times that of traditional manual leveling operations, which can guarantee the owner's requirements for ground flatness and levelness. ◆ Faster construction speed: It can greatly shorten the construction period and improve the work efficiency by 100~300% (150~300 square meters of paving work can be completed per hour, and 1500~2500 square meters can be completed every day on average), and the manpower can be reduced by more than 30%. It is especially suitable for engineering projects that require tight construction schedules, large injection areas, and high quality requirements. ◆ Better integrity of the ground: It is very easy to achieve large-area overall paving. This paving technology can avoid the hollowing problem caused by layered pouring of the floor. On the other hand, it can reduce a large number of construction joints and make the overall floor Sex is better. ◆ The post-maintenance cost of the ground is greatly reduced: due to the large-area overall paving, the construction joints can be reduced by 3-5 times, and the construction joints are easily damaged by the load, which can greatly reduce the post-maintenance cost of the ground. ◆ Wide scope of application: Not only can it be constructed on reinforced concrete ground with single-layer or double-layer steel mesh. Among them, the light-duty laser leveling machine is suitable for all kinds of concrete floors and reinforced concrete floors with single or double-layer steel mesh, especially suitable for large-scale, high-quality ground construction. ◤Process Principle◥: ◆ Concrete laser leveling machine leveling principle: use precision laser technology, closed-loop control technology and highly precise hydraulic system to achieve leveling under the automatic control of the computer. This closed-loop control can adapt to the elevation of the concrete surface and can Automatic adjustment 6 times. ◆ Concrete laser leveling machine leveling principle: Rely on the hydraulically driven leveling head, cooperate with the laser system and computer control system to complete the leveling work while automatically leveling. The leveling head is equipped with a scraper with integrated design and a leveling beam with a vibrator, which integrates all leveling work into one body. The computer control system automatically adjusts the elevation 6 times per second in real time, and the vibration frequency of the vibrator with balanced design can reach 30005000 times per minute. ◆ Principle of driving-type troweling machine finishing: the driving-type troweling machine is equipped with a double-disk knife holder, and the hydraulic drive system provides power and torque for the two non-overlapping knife holders respectively. To achieve better results, use the joystick on the handle to control the sprinkler system, so that the dry ground can be sprinkled at any time for remediation. ◤Construction process◥: Construction preparation ➨ D ividing separation joints ➨ Processing the ground base ➨ Supporting construction formwork ➨ Setting up laser leveling system and debugging equipment ➨ Pouring concrete ➨ Leveling with concrete laser leveling machine ➨ Manual leveling after mechanical leveling ➨ Disc extraction ➨ Scattering Abrasion-resistant aggregate ➨ disk operation ➨ drive-on trowel finishing ➨ maintenance and cutting. Compared with the original concrete floor construction technology, the benefits of using the dual-machine operation of concrete laser leveling machine + driving trowel machine are: fast construction speed, low construction investment, good overall appearance of the ground, and large investment in ground construction joints and corresponding materials. reduce and so on. In the future, with the continuous improvement of construction quality requirements for building ground engineering, this construction method will be widely promoted and applied.

    Although the concrete laser leveling machine is a highly precise device, it is not a "fully automatic wonder". The final leveling accuracy (FF/FL value) of it is highly dependent on the perfect coordination of "human-machine-material-method". Often, the machine itself is not faulty, but the ground it produces has unevenness or wave patterns. Here are the four main sources of common errors and their specific solutions. This is a "guide to avoiding pitfalls" derived from countless construction sites. This is the most common but also the most easily overlooked source of error. The laser system serves as the benchmark for the leveling machine. If the benchmark is incorrect, everything will be ruined. Source of error Description of the phenomenon Solution Reference drift of the transmitter Over time, the overall elevation of the entire area has shifted or there has been a large-scale inclination. Root control: The launcher tripod must be set up on a completely stationary base (strictly prohibited from being placed on soil prone to subsidence or on vibrating floor slabs). Root control: The launcher tripod must be set up on a completely stationary base (strictly prohibited from being placed on soil prone to subsidence or on vibrating floor slabs). Laser signal dead zone / interference The machine suddenly started to move erratically, or the leveling head began to shake up and down. Clean up the site: Ensure there is no obstruction (workers moving, pillars) between the transmitter and the receiver. Light shielding reflection: Remove large areas of glass and stainless steel plates at the scene to prevent multi-path laser reflection that could cause false signals. Adjusting the Dead Band: Based on the requirements for flatness, appropriately set the sensitivity (width of the dead band) of the receiver. Strong wind vibration During outdoor construction, strong winds blew the transmitter, causing the base surface to shake up and down. Physical Wind Protection: Build a wind shield around the transmitter, or use a heavy tripod with added weights. 💡 Expert tip: Never allow the power cords of the concrete pump pipe or the vibration rod to come into contact with the frame of the laser emitter! This is the most embarrassing error that can occur on-site. The mechanical condition of the machine directly determines whether it can accurately execute the instructions of the laser system. Question: If there is a significant difference in tire pressure between the left and right wheels, the machine will shake while moving, causing the leveling head to sway left and right and resulting in wave patterns. Solution: Before construction, the tire pressure of all four wheels must be measured to ensure they are exactly the same. Question: The laser caused the scraper to rise, but the hydraulic cylinder responded half a second later, resulting in a "pit" on the ground. Solution: Check if the hydraulic oil temperature is too high and if the solenoid valve is clogged. Problem: The bottom of the scraper is worn unevenly, resulting in scratches or stripes on the polished surface. Solution: Daily inspect the wear plate at the bottom of the scraper. Replace it immediately if it is severely worn. This is the factor that the machine "cannot control" but is the most affected one. The inconsistency in slump (cohesion) is the number one killer of flatness. Too dry (<100mm): The machine cannot scrape, or the leveling head is "pushed up" by the counterforce, resulting in an overly high ground elevation. Too dry (<100mm): The machine cannot scrape, or the leveling head is "pushed up" by the counterforce, resulting in an overly high ground elevation. Solution: Strict control must be exercised over the material distribution at the concrete mixing station! Designate a dedicated person to test the slump before the tanker unloads the material. Those with Unqualified slumps must be immediately withdrawn or adjusted on-site. The optimal slump for the laser leveling machine is typically 140mm ± 20mm (depending on the model). Question: The interval between the first batch of materials and the second batch is too long, resulting in "cold joints" or hardness differences at the junction. The machine will vibrate when passing through. Solution: Ensure continuous supply of materials and avoid any interruptions. A good machine requires a good operator. The operator's experience determines 30% of the final outcome. Error principle: If the concrete in front of the scraper is piled up too high (for example, more than half the height of the feeding screw), the machine resistance becomes too large, the tires slip or the machine head is lifted. If it is piled up too little, it will result in the pit not being filled. Solution: The operator needs to work in coordination with the general workers to ensure that there is always only 2-3 cm of excess concrete remaining on the scraper during the rolling process. Make more corrections when necessary and avoid excessive adjustments. Solution: The recommended standard overlap width is usually between 15cm and 30cm, and the marking lines should be used to assist with walking. Solution: The recommended standard overlap width is usually between 15cm and 30cm, and the marking lines should be used to assist with walking. Question: It's like driving over a speed bump. If you go too fast, the suspension system doesn't have enough time to react. Solution: Maintain a constant speed. It is generally recommended to keep the speed within the range of 3 – 5 meters per minute, allowing sufficient reaction time for the hydraulic system. Check 1 (Test): Before starting each day's work, calibrate the laser transmitter and check the tire pressure. Check 2 (Control): Strictly control the slump of the first batch of concrete, and set the standard for the day. Check 3 (and): At a distance of 2 meters behind the leveling machine, arrange workers to hold a 3-meter scraper to perform fine adjustment (remember: it's fine adjustment, not re-scraping), to eliminate any minor defects that may remain at the turning points or seams of the machine.   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.