Cost-benefit analysis of using power trowels VS manual polishing for commercial concrete floors

  If the laser leveler is used improperly, it is easy to cause danger, especially if it rolls over, it is likely to cause casualties. Therefore, when using the leveler, you should always maintain the correct operation method, because only in this way can the safety of the laser leveler be guaranteed to the greatest extent, and the construction quality of the leveler can be well exerted. Please see the following for the correct operation method. ◀ Before the laser leveler moves, check the road conditions, remove obstacles on the road, keep irrelevant personnel away from the leveler, and then retract the telescopic arm to start. ◀ Check the direction of travel, determine the position of the drive wheel, and then honk the horn, and the laser leveler will start to move slowly. ◀ When reversing the laser leveler, estimate the space behind the car in advance. If the blind spot is too large, ask a special person to direct and coordinate behind. ◀ The driver controls the walking speed according to the road conditions. When walking on an open flat ground, you can select "1" gear, and the walking speed of the laser leveler will automatically increase or decrease according to the working pressure of the hydraulic walking circuit; when going up and downhill, you can select "0" gear, and the laser leveler will walk at a low speed and high torque. ◀ Try to choose a flat road when the laser leveler is walking. ◀ Avoid walking the leveler in water as much as possible. If you must wade, remember to explore the water depth and the soft and hard platform of the bottom of the water in advance. It is not suitable to walk if the underwater silt is too deep or the water surface exceeds the wheels The above is the correct operation method of the laser leveler. I hope you can get some substantial reference value from this article. If you have other questions, please feel free to consult us at any time, and we will answer them one by one.

1. Definition: 1.1 Definition of laser leveling machine: guided by laser, used for leveling and leveling concrete a kind of machine equipment. 1.2 Definition of laser leveling: When large-area concrete floor is being constructed, laser leveling machine is used to vibrate,  level and control the ground elevation of newly poured concrete. 2. Introduction of floor concrete laser leveling machine The technology principle of the laser leveling machine for floor concrete relies on gasoline generator to generate electricity,  and uses the flat head to drive the laser measurement and control system, computer control system and servo drive system  to complete the leveling work. The whole machine is composed of the fuselage and flat head, and the leveling of concrete  is mainly completed by the flat head part. 3. Preparation 3.1 After the basic level treatment, the laser leveling machine equipment debugging, according  to the original leveling point to a fixed reference level; Lay plastic film, tie steel mesh (according  to the design needs), set the edge die; Set up the laser transmitter, according to the original level  of the floor elevation into the laser leveling machine. 3.2 The concrete shall be transported by commercial concrete and transported to the construction  site by concrete truck. 3.3 Elevation check Use the hand-held receiver to check the elevation of the floor, introduce the elevation into the laser  leveling machine, adjust the reference point of the leveling machine. 4. Concrete paving Within the effective construction range of the flat head of the laser leveling machine, the concrete  is first made artificially to the height of 1-2㎝ (the specific height depends on the concrete slump),  and then the vibration, compaction and leveling work is completed by the laser leveling machine  of the floor concrete in one time.

    Selecting a second-hand polishing machine is a job that requires a lot of experience and skills. It can help you obtain a practical device at a lower cost, but if you make a wrong judgment, the subsequent maintenance and delayed construction period may cause you to lose more than you gain. The following is a detailed list of key points for choosing a second-hand polishing machine and common methods to avoid pitfalls. We hope it can be of great help to you. Fuselage structure Chassis (grinding disc) : This is the most crucial part. Check if it is flat and free of deformation. Slight wear and tear is normal, but if the wear is severe, there are pits or obvious deformation, it will lead to poor polishing effect and higher replacement cost. Blade (scraper) : Check if there is still sufficient thickness. If the metal substrate has been worn out, it needs to be replaced immediately, and this cost should be included in the cost. Protective cover: Check for any damage or severe deformation, as this is related to operational safety. Overall framework: Check for any signs of welding, cracks or repairs, which could be a sign of severe impact or drop. Engine (heart) Brand: Give priority to well-known brands such as Honda, Kohler, Briggs & Stratton, etc. Spare parts are easy to find and maintenance is convenient. Appearance: Check for any cracks in the engine casing, especially in the base and radiator sections. Check for obvious oil stains or carbon deposits. This might be a sign of oil leakage or poor maintenance. Air filter: You can ask to remove the air filter to have a look. If the inside is very dirty or even soaked with oil, it indicates that the previous owner might not have paid much attention to maintenance. Engine oil: You can pull out the oil dipstick to check. If the engine oil is black, viscous or contains metal debris, it indicates that the engine wear may be relatively severe and the maintenance condition is poor. Transmission system Gearbox: Check if there are any signs of oil leakage on the gearbox housing. Rotate the drive shaft by hand to feel if it is smooth, and if there is any jamming or abnormal noise. Belt/chain: Open the protective cover and check if the belt has cracks, wear or looseness. Check if the chain is loose and free of oil and rust. Be sure to ask the seller to start the machine for testing! Startup performance Cold start is the most illustrative. Observe whether the rope pulling is smooth and whether the machine can start smoothly within one to three rope pulls. If it is difficult to start, there may be problems (such as carburetors, spark plugs, insufficient compression, etc.). Engine sound After starting, listen to the sounds of the engine idling and accelerating. The operation should be smooth. A regular "tap-tap" sound is normal (valve sound). If there are loud "clicking" sounds, knocking sounds or irregular noises, it indicates that there is severe wear inside. Transmission system sound Let the trowel run idle and listen for any abnormal "clattering" sounds from the gearbox and transmission parts. The voice should be even and deep. Vibration condition When the machine is running, it should be smooth and the vibration should be within a reasonable range. If the vibration is abnormally severe, it may be due to deformation of the chassis, unbalanced installation of the blades or problems with the engine base Purchase time and source: Inquire about the specific year and channel of purchase of the machine to determine its service life. Usage frequency and scenarios: Is it for occasional household use or long-term high-intensity use by professional teams? The latter naturally wears out more severely. Maintenance and repair history: This is of Paramount importance. Has there been any major overhaul? (Such as engine cylinder opening, gearbox replacement When was the last time the engine oil, air filter and spark plugs were changed? Have there been any accidents (such as tipping over or collision)? A reliable seller will tell the truth, while a evasive one needs to be on guard. If possible, conduct a brief load test (such as grinding it on the ground). Observe after the load is applied: Whether the engine is prone to stall and whether the power is sufficient. Check for any slippage or abnormal noise in the transmission system. Whether the machine moves smoothly and if it deviates. Trap description: Merchants thoroughly clean and paint the machines to make their appearance look as good as new, thereby covering up internal wear and tear and malfunctions. Avoidance methods Pay special attention to the screws and interfaces: It is very difficult for a refurbished machine to have no signs of any screws being turned. Check whether there are any signs of wear on the engine fixing screws, chassis screws, etc. Paint surface consistency: The original factory paint surface is usually uniform. If you find that the paint color of some parts does not match the overall color or the paint layer is too thick, it might be due to later spraying. Don't judge a machine by its appearance: Don't be deceived by a clean exterior. The key is to check its operating status and internal wear. Trap description: The machine was once sold after its chassis and frame were deformed due to a fall or collision. It was sold after simple repairs. Avoidance methods Check the flatness: Place the machine on a flat ground and observe from the side whether the chassis is fully in contact with the ground and if there is any warping. Check the welding points: Carefully inspect each connection point of the rack to see if there are any irregular or rough welding points in the later stage. Running test: During no-load operation, observe whether the machine is stable and if there is any regular swinging. This might be a sign of an uneven chassis. Trap description: Piecing together a complete machine with "good" parts from different scrapped machines, which has poor compatibility and stability. Avoidance methods Brand consistency: Check whether the brand, model and newness of the main components such as the engine and fuselage match. Assembly machines often give the impression of being "mismatched". Check the nameplate: Whether the information on the body nameplate (such as model and production date) is consistent with the seller's description. Poor comprehensive operation: When the assembly machine is in operation, various minor problems may occur frequently, making it feel "not smooth". Trap description: The machine performs okay when it is cold or unloaded, but once it is heated up or loaded, problems become apparent (such as insufficient power, severe abnormal noises, and engine stalling). Avoidance methods Persist in long-term testing: Let the machine run for 10 to 15 minutes and observe whether the state is stable after warming up. Load testing is required: This is the best way to verify the true state of the machine. Check the engine oil: After warming up the machine, stop it immediately and check the engine oil. If there are many small bubbles (emulsions) in the engine oil, it might be that the cylinder gasket is being washed away, which is a big problem. Before deciding to purchase, quickly check the following list: Inspection items Qualification standard Be cautious/give up Fuselage chassis Smooth, evenly worn, and without deformation Deformation, cracks, wear limit Engine Well-known brand, smooth start-up, stable operation, pure sound, no oil leakage Difficult to start, severe abnormal noise, oil leakage, and heavy smoke Transmission system The rotation is smooth without any abnormal noise, and the belt/chain is not aged There is abnormal noise, jamming and oil leakage Seller Description Be honest, answer all questions, and keep clear maintenance records Vague and evasive, concealing history Price In line with market conditions (approximately 30% to 50% of a new model) Far below the market price (" There's no such thing as a free lunch ") Test run situation The hot and cold units start well and operate stably under no-load or load conditions Any test is unqualified Final suggestion: If possible, bring along an experienced master craftsman or mechanic. Their experience can help you discover many problems that beginners fail to notice. When making a purchase, it is best to sign a simple written agreement with the seller, clearly stating the condition of the machine, and keep the payment voucher for unexpected needs. Remember, the primary principle when purchasing second-hand equipment is "It's better to miss out than to buy wrongly." Wish you could find a sturdy and durable good 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.