Characteristics of concrete cutting

  – Polishing : When the poured and leveled concrete reaches the initial setting, the ground polishing process begins. First, use a single-disc polishing machine and a trowel disc to cross-break the slurry and trowel to ensure the flatness control of the machine operation process. Then, use a 3-meter scraper to rotate 360° to level the surface layer to achieve full control of flatness. After the first disc cross-trowel, professional technicians use a 3-meter scraper to fully level the compacted concrete surface layer. – Finishing : As the disc trowels, the machine uses a blade to smooth it. According to the speed of the strength increase, when the concrete theoretically reaches the final setting, the mechanical vertical knife method is used, combined with the machine speed and blade angle, to perform the final finishing on the surface layer.   – Moisturizing maintenance: After the floor is finished, use a maintenance blanket or a special maintenance non-woven fabric to cover it and water it to keep it moist. Concrete needs to be cured 12 hours after pouring. It can be covered with plastic cloth, watered, or sprayed for maintenance. The curing should be carried out for at least 7 days. – Temperature control: Ensure that the temperature difference between the inside and outside of the concrete is less than 25℃, assign a special person to watch over it, ensure that the concrete surface is clean and watered in place.   – Cover protection: If the upper construction continues on the finished floor, it is necessary to strengthen the protection of the finished product. The paper fiberboard can be used to cover the entire system to protect the concrete surface. – Protective measures: When dismantling the shelf, you can use a protective bamboo fence to cover the entire range of the dismantled shelf, and throw the dismantled steel pipes and fasteners on the bamboo fence to prevent the steel pipes and fasteners from directly hitting the "clear water concrete" floor (ground).   – Anti-pollution treatment: If there are anti-pollution requirements for the finished floor (ground) surface, a special concrete sealing wax can be applied to the finished surface to form a surface wax coating to prevent pollution from damaging the floor (ground) surface. – Expansion joint cutting: After the concrete is finally set, the expansion joint is cut according to the design requirements to prevent the ground from cracking.  

    Before a concrete laser leveling machine that has been idle for a long time is reactivated, a systematic inspection should be carried out to eliminate potential faults (such as component rust, circuit aging, hydraulic jamming, etc.), and the equipment performance should be restored in combination with maintenance to avoid construction quality problems or safety accidents caused by component failure when it is reactivated. The following are the specific inspection and maintenance steps, which are disassembled according to the logic of "appearance → core system → auxiliary components → trial operation" First, inspect thex eterior of the equipment and its easily worn parts, with a focus on checking for physical damage, rust or loosening caused by long-term idleness. This is the foundation for ensuring subsequent system checks. Check whether the frame of the machine body, the leveling scraper and the vibration beam have any deformation or cracks (especially at the welding parts). If there is any slight deformation, it needs to be corrected. If there are cracks, they need to be repaired by welding and ground smooth. Check whether all exposed metal parts (such as bolts, pins, and connecting brackets) are rusted. Rusted areas should be cleaned with a wire brush and then coated with anti-rust oil. Severely rusted parts (such as pins that are stuck) need to be replaced. If it is a wheeled model: Check whether the tire pressure is normal (refer to the standard value in the equipment manual), whether there are cracks, bulges or foreign objects embedded in the tire surface, and whether the valve stems are leaking. If it is a tracked model: Check whether the track plate is excessively worn (the tread depth should be replaced if it is less than 1mm), whether the track tension is appropriate (press the middle section of the track with your hand, and the subsidence should be controlled within 10-15mm), and whether the track pin shaft is stuck (try to rotate it after injecting grease). Check whether the protective covers of the emergency stop button and the operating handle are intact. After the emergency stop button is pressed, it should be able to immediately cut off the power and start normally after resetting. Check whether the warning lights and buzzers are functioning properly (test after power-on), and whether the safety guardrails and anti-slip steps are firm, without any looseness or missing parts.   The core performance of the laser leveling machine machine relies on the power system, hydraulic system and laser control system. It is necessary to check each internal potential hazard one by one to avoid "breaking down" or precision failure when it is put into use. Type Inspection items Maintenance measures Diesel engine 1. Oil level and quality If the engine oil is below the mark, it needs to be replenished (using the same type of engine oil). If it deteriorates (turns black or contains impurities), it should be completely replaced 2. Fuel tank and fuel quality 2. Drain the deteriorated diesel from the fuel tank, clean the tank and then add new diesel. Check if the fuel filter element is clogged (if it is clogged, it needs to be replaced). 3. Coolant level 3. If the coolant is insufficient, it needs to be replenished. (Mix the antifreeze in proportion and avoid adding tap water directly.) 4. Air filter element 4. Remove the air filter element and blow it clean in reverse with compressed air (if the filter element is damaged, it needs to be replaced). 5. Spark plugs/fuel injectors 5. Remove the spark plugs to clean the carbon deposits (if the gap is abnormal, adjust it). The fuel injectors need to be disassembled to check the atomization effect (if the atomization is poor, clean it). Electric motor 1. Motor housing and terminal blocks Clean the dust off the motor casing and check if the terminal blocks are loose or oxidized (oxidation should be sanded with sandpaper). 2. Carbon brushes (if any) When the carbon brush is worn down to one-third, it needs to be replaced to ensure good contact between the carbon brush and the commutator 3. Insulation resistance 3. Measure the insulation resistance with a megohmmeter. A resistance of ≥0.5MΩ is qualified (to avoid leakage). Long-term idleness of the hydraulic system is prone to deterioration of the oil and aging of the sealing parts, which requires special inspection: Hydraulic oil inspection: Open the oil tank cover and observe the color of the oil (normally light yellow. If it turns black or becomes turbid, it needs to be replaced) and the liquid level (it should be within the range of "MIN-MAX" on the oil gauge. If it is insufficient, add the same type of hydraulic oil). If the oil has been idle for more than six months, it is recommended to replace it even if its appearance is normal (the oil will oxidize and become ineffective). Leakage inspection: Check the hydraulic oil pipes, joints, and cylinders (especially the leveling cylinder and traveling cylinder) for any leakage marks. If leakage is found, replace the sealing parts or damaged oil pipes. The joint should be re-tightened according to the manual torque (to avoid over-tightening and damaging the thread). Maintenance of hydraulic components Clean the hydraulic oil filter element (if it is a paper filter element, replace it if it is clogged) to prevent impurities from entering the cylinder and causing wear. Manually push the piston rod of the oil cylinder to check for any jamming (if there is jamming, disassemble the oil cylinder to clean the internal impurities and refill the hydraulic oil). Before starting the equipment, manually rotate the coupling of the hydraulic pump to ensure there is no jamming (to avoid damage to the pump body). The laser system is the "eyes" of the leveling machine. When idle, it is prone to sensor moisture and poor circuit contact, and precise inspection is required Laser emitter Clean the dust off the transmitter lens (wipe it with a soft cloth to avoid scratches), and check the battery power (replace it if insufficient). Power on and test whether the transmitter can emit laser normally (the laser line should be uniform and free of flicker). If the laser is weak or there is no laser at all, check the internal circuit or replace the transmitter. Laser receiver Check whether the receiver probe is damaged or damp (if damp, it needs to be dried), and whether the terminal blocks are loose. Bring the receiver close to the transmitter to test if it can receive signals normally (the indicator light needs to switch normally according to the "high and low positions"). If the signal is unstable, the receiver needs to be calibrated (perform zero point calibration according to the steps in the equipment manual). Control circuit: Check whether the connection lines of the laser control system (from the receiver to the controller, and from the controller to the hydraulic valve) are damaged or aged. The line joints need to be re-plugged and unplugged to ensure good contact (to avoid signal interruption and accuracy deviation).   Apart from the core system, minor issues with auxiliary components may also cause the equipment to fail to operate normally. Each one needs to be confirmed Check the battery level (measure the voltage with a multimeter. For a 12V battery, a voltage of ≥12.4V is normal. If it is insufficient, it needs to be charged; if it has been idle for more than 3 months, it needs to be charged before use to avoid battery depletion and scrapping). Clean the dust inside the distribution box, check whether the fuses are intact (replace the fuses of the same specification if they are blown), and whether the contacts of the relays and contactors are oxidized (if oxidized, sand them with sandpaper). Apply grease to the "lubrication points" marked in the equipment manual (such as walking bearings, scraper connection shafts, and laser receiver rotating shafts) (use lithium-based grease and avoid mixing different types of grease). Each lubrication point should be filled until grease overflows (ensure adequate lubrication). Diesel model: Check whether the fuel pump and fuel line are unobstructed (you can manually pump fuel to remove air), and whether the exhaust pipe is blocked (clean carbon deposits). For electric models: Check if the charger is functioning properly (the indicator light needs to switch normally during charging), and if the cable is damaged (any damage should be repaired with insulating tape to prevent leakage). After completing all inspections and maintenance, it is necessary to conduct a trial run to confirm that the equipment is free of faults and avoid direct construction under load. Start the equipment (engine/motor), let it idle for 5 to 10 minutes, and observe whether the power system is stable (without abnormal noise or vibration) and whether there is any leakage in the hydraulic system. Test each action of the operation handle: walking (forward/backward, turning), lifting and lowering of the leveling scraper, and vibration of the vibrating beam. Ensure that the actions are smooth and without any lag. The laser control system can normally control the leveling height (for example, when the receiver detects the laser offset, the equipment can automatically adjust the height of the scraper). Lay a small amount of concrete (about 10-15cm thick) in an open area, start the equipment for leveling operation, and inspect: Whether the walking speed is uniform (no sudden fast or slow); Whether the vibration frequency of the vibrating beam is normal (no abnormal noise, no obvious honeycomb on the concrete surface); The flatness of the concrete surface after leveling (measured with a 2-meter straightedge, the error should be ≤3mm/2m, meeting the construction standards). During the trial operation, if any abnormality is detected (such as noise, leakage, or accuracy deviation), the machine must be stopped immediately and the fault rechecked.   Refer to the equipment manual: The structure of laser leveling machine machines of different brands may vary. All inspections and maintenance should be based on the parameters in the equipment manual (such as hydraulic oil type, lubrication point position, torque value) to avoid misoperation. Pre-idle record: If conditions permit, a record should be made before the next idle period (such as the time of oil change and the status of components) to facilitate targeted inspection during the next activation. Safety precautions: During inspection and maintenance, the power source must be cut off (remove the key, disconnect the negative terminal of the battery) to prevent accidental start-up. Safety belts must be worn during high-altitude inspections (such as the installation of laser emitters) to prevent falls. Through the above steps, the potential risks of long-term idleness can be comprehensively eliminated, ensuring that the laser leveling machine machine performs stably and meets the precision standards after being reactivated, and avoiding rework or safety accidents caused by equipment failure during construction. 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.

    Lubrication and maintenance of the power trowel is the core work to ensure the long-term stable operation of the equipment and prevent sudden failures. The key lies in "using the right oil, finding the right time, doing it on time and using the right method". The following are the specific key points 1. Power trowel the main shaft bearing – the most crucial and frequent Location: The center drive shaft of the pan, usually with 1-2 grease nozzles. Lubricant: High-temperature resistant (≥120℃), extreme pressure lithium-based grease (such as molybdenum disulfide grease) must be used. Ordinary butter must not be used. Method and Cycle It must be carried out after each shift's work (working for 8 to 10 hours). Thoroughly clean the grease nipple and its surroundings. Add until the new grease overflows: Use a grease gun to add until the clean new grease is completely squeezed out from the edge of the bearing seal ring from the old grease. Wipe off the excess grease. Objective: To remove metal shavings and impurities produced by internal wear and ensure that the bearing cavity is filled with new grease. 2. Gearbox/reducer Lubricant: Select the specified type of gear oil (such as SAE 80W-90 GL-4) strictly in accordance with the instructions. Check: Every day, check through the oil window or dipstick whether the oil level is between the upper and lower marks. Replacement cycle First replacement: After the new machine has been running for 20 to 30 hours, remove the running-in debris. Regular replacement: Replace it every 300 to 500 hours of operation or annually thereafter. Key point: Oil change should be carried out when the oil temperature is still hot after the equipment is shut down to ensure that the old oil is completely drained. 3. Traveling wheels and steering mechanism Location: Walking wheel bearing, steering tie rod ball joint, hinge point. Lubricant: The high-temperature resistant lithium-based grease as mentioned above. Cycle: Every 50 hours of operation or once a week. Method: Clean each grease nozzle and add grease until new grease overflows from the gaps. 4. Engine (Gasoline model) Engine oil inspection and replacement Check the oil dipstick before starting every day to ensure the oil level is normal. First replacement: After running for 20 to 30 hours. Regular replacement: Every 100 hours or every quarter. The cycle should be shortened in harsh environments. Air filter maintenance: Regular cleaning. For oil bath air filters, use the dedicated air filter oil as per the instructions. Cleaning first: Before filling, be sure to clean the oil nozzle, oil cap and the surrounding area to prevent sand, dust and concrete particles from being brought into the interior. Strict specifications: Different parts should use the specified type of grease/oil products. They must not be mixed or substituted. High-temperature grease is the "life-saving oil" for the main shaft bearings. Squeezing out the old grease: For bearing lubrication, "adding until the new grease overflows" is a necessary step. This is the only effective way to remove contaminants and ensure the lubrication effect. Precise cycle: The maintenance cycle is mainly based on the operating hours (rather than calendar time) and is strictly recorded. Error: Lubricate the main shaft bearings with ordinary grease. Consequence: The grease melts and leaks away at high temperatures, the bearings dry grind rapidly and burn out at high temperatures, leading to the failure of the entire machine. Error: Only add fat without squeezing out the old fat. Consequence: Metal shavings accumulate in the bearing cavity, forming abrasives, accelerating wear, and causing abnormal noises and jamming. Error: Ignoring the oil level in the gearbox and its replacement. Consequence: Insufficient lubrication of gears and bearings leads to pitting corrosion, broken teeth, and scrapping of the reducer. Error: The spilled grease was not cleaned up after lubrication. Consequence: Grease adsorbs dust to form hard scale, which damages the sealing performance of the oil seal and makes it easier for impurities to invade. Create a lubrication chart: Make a simple chart of all lubrication points, oil types and cycles of the equipment, and stick it in a prominent place on the equipment. Equipped with dedicated tools: Use high-quality grease guns and dedicated oiling nozzles to ensure sufficient filling pressure. Record: After each maintenance, record the operating hours and maintenance items to form a traceable maintenance file. Long-term storage and maintenance: Before the equipment is out of use, thoroughly lubricate all lubrication points once. The engine oil should be changed or stabilizers added as per regulations to prevent internal rusting. The lubrication and maintenance of a power trowel essentially involve the continuous confrontation with its harsh working environment (heavy load, high temperature, and much dust). By grasping the two key points of "post-shift high-temperature grease extrusion lubrication" for the main shaft bearings and "regular oil change" for the gearboxes, the vast majority of major mechanical failures can be avoided, significantly extending the service life of the equipment.   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.