How to clean the leveling head of concrete laser leveling machine

  In logistics warehousing, precision manufacturing, and other fields, **superflat floors** are fundamental to ensuring the smooth operation of high-reach forklifts, automated guided vehicles (AGVs), and high-precision equipment. The core indicator for measuring floor quality is the F-Numbers (F-value), which mainly includes two values: FF and FL. The following is an in-depth summary of its standard interpretation and testing methods: Compared to the traditional "3-meter straightedge test method," the F-value system uses statistical analysis of the undulations of the floor surface to more scientifically reflect the actual working performance of the floor. Meaning: Describes the degree of "undulation" (local unevenness) of the floor surface. Calculation Principle: Calculates the curvature change by measuring the height difference every 300mm (1 foot). Performance Characteristics: A higher FF value indicates a smoother floor, resulting in less shaking and bumping when forklifts are in motion. Meaning: Describes the overall inclination of the floor relative to the design horizontal plane (macro slope). Calculation Principle: Measures the total height difference over a distance of 3000mm (10 feet). Performance Characteristics: A higher FL value indicates a floor closer to absolute level. This is crucial for the verticality of high-bay racking (VNA). According to ACI (American Concrete Institute) 302.1R standard, floor grades are typically classified as follows: Flooring Classification Specify overall flatness (FF) Specify overall flatness (FF) Applicable Scenarios Standard 20 15 Machine rooms, parking lots, general warehouses Standard Grade 25 20 Light industrial and commercial office buildings Flat Grade 35 25 Narrow aisle warehouses (non-high-rise), laboratories Extra Flat Grade 45 35 Ice rinks, precision manufacturing plants Super Flat Grade 60+ 40+ High-rise VNA warehouses (above 12 meters), television studios The internationally accepted testing standard is ASTM E1155. Domestically, this standard or industry regulations are typically referenced for acceptance testing. This is currently the most widely recognized testing tool. It is a walking electronic level; the operator pushes it across the ground, and the device automatically records the elevation difference between every two points (usually 300mm apart). Golden Time: Testing should be conducted within 24 to 72 hours after concrete pouring. Reason: Because concrete undergoes long-term shrinkage and warping, early testing reflects construction quality, while later testing is affected by structural deformation. Test Line Layout: Multiple parallel and perpendicular test lines are typically laid out within each test section. Total Length Requirement: At least 34 elevation measurements are required per 1000 square feet (approximately 93 square meters) to ensure the validity of the statistical data. The acceptance report will show two key evaluation dimensions: Specified Overall Value (SOV): The average score for the entire floor slab, which must meet the design specifications. Minimum Local Value (MLV): The permissible baseline for quality (typically 60%-70% of the SOV). Even if the overall score is acceptable, if a local MLV fails to meet the standard, that area must be repaired. Laser leveling: Using a high-precision laser leveling is essential to achieving an F-value > 40. Repeated Scraping with a Highway Straightedge: Before the concrete initially sets, repeated cross-scraping with a large leveling (Highway Straightedge) is crucial for improving the F-value. Segmented Construction: Using a long-strip construction method makes it easier to control precision compared to large-area pouring.   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.    

    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.    

​ For the concrete laser leveling, the tire is the necessary factor to walk, is an important accessory of the equipment. Once there is a problem with the tire of the laser leveling machine, it will directly cause the equipment to fail to function properly. The Method Of Quick Tire Replacement 1.Starting the machine, look for a relatively flat open field, press down the boom lift rod, use the boom support to remove the front wheel off the ground, and then support the flash bridge close to the flat tire side, and wedge the rear wheel (must work closely with the driver to avoid personal injury). 2, the use of crowbar and other tools, remove the bezel and lock ring and then check whether the tire liner and the outer surface of the rim is adhesion (the tire use time is longer, the liner and the outer surface of the rim can be adhesion). If the support can be removed, so that the machine in a short distance slow back and forth until the liner is separated from the outer surface of the rim; Then, the front wheels are back up. 3, the internal and outer tire of the relative position of the mark, in order to find, remove foreign objects and repair tires. 4, using the crowbar and other tools, the tire from the rim to remove. Note that the action should be gentle with the tacit understanding, to avoid being hit by tires, and to protect the valve nozzle. 5.After the outer tire is injured by nails and other slender foreign bodies, if the surface does not have a significant opening or the wound is small, then the tire can continue to be used, if the opening is large, must be repaired (because the machine is operated, the tire is crushed and frictiond, a long time will damage the inner tube, even the opening is larger and larger, the inner tube protrudes, resulting in tire scrapping). 6. If the new inner tube, the bolts at the bottom of the valve nozzle must be tightened to prevent leakage, and then remove the foreign body from the inner cavity of the outer tube and sprinkle it with appropriate talcum powder, applied evenly. In order to make the liner and the inner and outer tire tight, after loading the inner tube should be properly inflated for the inner tube, and then stuffed into the pad. 7, the tire mounted on the rim, installed lock ring, bezel; 8, with the car air compressor to the tire inflatable. 9, press down the boom lift rod, take out the laser leveling machine bracket; Shandong Vanse Machinery has large, medium, small, various models of laser concrete flatflating machine, suitable for large-scale workshop plant. When you choose Vanse equipment, you also choose to have peace of mind after-sales protection. We provide quality after-sales service for all customers 365 days a day. If you have any problems with your equipment, please feel free to contact us at any time. Remote telephone after-sales guidance is an efficient after-sales support method. Our after-sales service engineers will get in touch with you as soon as possible and help you to restore the normal operation of the equipment as soon as possible. Vanse Service, anywhere and anytime!!!