A Survey of Calculation Methods for Multihead Weigher of Transmission Belts

Author: Smartweigh–Multihead Weighter

The raw material load data signal and speed data signal of the multihead weigher of the transmission belt are input into the excellent weighing control panel to accurately measure the socket, and the specific feeding amount is measured. The automatic control system compares the specific feeding amount with the set feeding amount, and adjusts the output control amount. The operating speed of the conveyor belt keeps the feeding amount close to the range of the set amount analysis.. Electronic device belt multihead weigher Multihead weigher Measuring range calculation method: Electronic device belt multihead weigher commonly used weighing multihead weigher Measuring range selection It can be determined according to the evaluation and evaluation of factors such as the larger weighing value of the scale, the number of the weighing ground, the weight of the scale body, and the large wheel weight and load that are likely to cause the ground. Generally speaking, the larger the measurement range of the multihead weigher is. The closer the load is assigned to each multihead weigher, the higher the accuracy of its weighing. However, in specific applications, because the load added to the multihead weigher is not only the object to be weighed, but also the weight of the scale itself. , tare weight, wheel weight and vibration impact and other loads, so when using the weighing multihead weigher to measure the range, it is necessary to consider many factors to ensure the safety and service life of the weighing multihead weigher. The calculation method of the weighing distance is After taking into account every element that harms the scale body, after many tests, it is clear that the formula is calculated as follows: =(+)—Rated range of single weighing multihead weigher;—The weight of the scale body;—The highest value of the net weight of the item being weighed;—The total number of pivot points selected by the scale body;—Commercial insurance index, generally assigned in ~ middleman;—impact index;—Offset index of the center of gravity of the scale body;—Air pressure index. Talk about how to use weighing multihead weigher multihead weigher is called the cardiovascular of weighing equipment, and its characteristics determine the accuracy and reliability of weighing equipment on a very large level. In the design proposal When weighing equipment, it is often difficult to use a multihead weigher. How to use a multihead weigher to weigh a multihead weigher is actually a device that converts the quality data signal into an electronic signal output that can be accurately measured. The first thing to use a multihead weigher is Considering the specific office environment where the multihead weigher is located, this is particularly important for the proper use of the multihead weigher, and it is related to whether the multihead weigher can work properly and other security and lifespan, and even all electronic reliability and safety factors. Naturally The environmental damage to the multihead weigher is mainly due to the following aspects: () The high temperature environment causes the multihead weigher to melt the coating raw materials, open the spot welding, and cause structural changes in the thermal stress of the polyurethane elastomer. The ground multihead weigher often chooses heat-resistant multihead weigher; in addition, be sure to add equipment such as heat insulation, water cooling or air cooling. () Smoke, humidity and cold cause short-circuit failure to the multihead weigher. It should be used here under the standard of natural environment The tightness is very strong. Multihead weigher. Different multihead weighers have different sealing methods, and their tightness is very different. Generally, the sealing is filled or coated with sealant; rubber sheet machinery is tightened for sealing; Electric welding (argon arc welding machine, etc. electron beam welding) and vacuum packaging nitrogen-filled sealing. From the actual effect of sealing, electric welding sealing is the best, and the amount of filling and coating sealant is poor. For the cleanliness of the room , For multihead weighers working in a dry environment, you can choose a multihead weigher that is sealed with glue, and for some multihead weighers that work in a humid, cold, dusty environment than a fortress, you should choose a pulse damper that is heat-sealed or sealed. Pulse damper electric welding sealing, vacuum packaging nitrogen-filled multihead weigher. () In the corrosive natural environment, such as wet and cold, acid and alkali damage to the multihead weigher causing damage to the polyurethane elastomer or causing short-circuit failure, external The surface layer has been carried out electrostatic spraying or stainless steel plate cover, which has good corrosion resistance and good sealing performance. The head weigher outputs the hazard of chaotic data signals. In this case, to solve the multihead weigher's shielding performance, carry out a rigorous inspection to see if it has good electromagnetic resistance. () Flammability, flammability and explosion Multihead weighers lead to premature hazards, and the return of other machinery and equipment and life safety results in great threats. Therefore, multihead weighers that work in flammable, flammable and explosive environments clearly put forward a more fortress for explosion-proof characteristics. Regulations: Explosion-proof multihead weighers must be used in flammable, flammable and explosive environments. The airtight housing of such multihead weighers must not only take into account its airtightness, but also fully consider the compressive strength of explosion-proof type, and The cable leads to moisture-proof, waterproof, explosion-proof, etc. Next, the selection of the total number of multihead weighers and the measurement range. The selection of the total number of multihead weighers is based on the main purpose of the weighing equipment, the number of points that the scale body must support (the number of fulcrums). It should be determined according to the standard of overlapping the geometric center of gravity of the scale body and the specific gravity center point. Generally speaking, several multihead weighers are used for several fulcrum points of the scale body, but for some unique scale bodies such as electronic hook scales Only one multihead weigher is selected, and some electromechanical engineering fusion scales should clearly use the number of multihead weighers according to the specific situation. The selection of the multihead weigher measurement range can be based on the larger weighing value of the scale, the number of multihead weighers, and the scale itself. Factors such as weight, wheel weight and load that are likely to be larger are evaluated to clarify. Generally speaking, the closer the measurement range of the multihead weigher is to the load assigned to each multihead weigher, the higher the weighing accuracy. In specific applications, because the load added to the multihead weigher not only includes the object to be weighed, but also has loads such as its own weight, tare weight, wheel weight, and vibration impact. There are many factors to ensure the safety and service life of the multihead weigher. The calculation method of the measurement range of the multihead weigher is after taking into account each factor that harms the scale body, and has been clearly tested after many tests. The formula is calculated as follows: = ( +)—Rated range of single multihead weigher;—The weight of the scale body;—The highest value of the net weight of the item being weighed;—The total number of pivot points selected by the scale body;—Commercial insurance index, generally assigned in ~ middleman;—impact index;—Offset index of the center of gravity of the scale body;—Air pressure index. For example: an electronic floor scale, the larger weight is, the weight of the scale body is index—=, pressure index =, try to determine the cargo capacity of the multihead weigher. Solution: According to the calculation method of the measurement range of the multihead weigher: = (+) Learn: =××××(+)/= Therefore, the measurement range of the multihead weigher can be used (the cargo capacity of the multihead weigher is generally only, etc., unless it is uniquely customized). Within its measurement range, but for some electronics that have a large impact force in the whole process of application, such as dynamic rail scales, dynamic electronic truck scales, stainless steel plate scales, etc., when using multihead weigher, it is generally necessary to expand its The measurement range is to make the multihead weigher work within its measurement range, and to expand the weighing storage capacity of the multihead weigher to ensure the safety and service life of the multihead weigher. Again, consider the application of multiple types of multihead weighers The key to the selection of the multihead weigher form is the type of weighing place and the installation indoor space to ensure that the installation is suitable and the weighing is reliable; on the other hand, the manufacturer's proposal should be considered. Performance parameters, installation methods, structural forms, polyurethane elastomer materials and other characteristics require multihead weigher applications. For example, aluminum cantilever beam multihead weigher is suitable for billing scales, platform scales, case scales, etc.; steel cantilever beam multihead weigher is suitable for materials Warehouse scales, electronic belt scales, multihead weighers, etc.; steel accumulation chain multihead weighers are suitable for rail scales, electronic truck scales, traveling scales, etc.; column-type multihead weighers are suitable for electronic truck scales, dynamic rail scales, and large-capacity silo scales, etc. Finally, the multihead weigher accuracy level is also selected. The multihead weigher accuracy level includes multihead weigher nonlinearity, stress relaxation, stress relaxation repair, lag, repeatability, sensitivity and other performance indicators. In the case of a weigher, it is not necessary to simply pursue a perfect and advanced multihead weigher, but not only consider the accuracy requirements of the electronic weigher, but also its cost. The selection of the multihead weigher level must consider the following two criteria: . Consider the input requirements of the instrument panel. The weighing display instrument has the output data signal of the multihead weigher to be enlarged,/transformed, etc. to display the information weighing result. Therefore, the output data signal of the multihead weigher must be greater than or equal to the instrument panel specification. Type data signal size, will be mult The output sensitivity of ihead weigher replaces the matching formula of multihead weigher and instrument panel. For example: a weighing scale is a quantitative packaging machine, and the larger scale is a measuring range for people; the scale body is only——type multihead weigher, the measurement range is , the sensitivity is±/, the electrical working pressure of the stone arch bridge; the scale uses the instrument panel. Ask whether the multihead weigher can be matched with the instrument panel. Solution: After inspection, the input sensitivity of the instrument panel is μ/, so according to the multihead weigher and the instrument panel, the matching formula must be obtained. The specific input data signal of the instrument panel is:××/××=μ／＞μ/ Therefore, the selected multihead weigher is specified by considering the input sensitivity of the instrument panel, which can be matched with the selected instrument panel. Considering the accuracy of an electronic scale, an electronic scale is mainly composed of the scale body, The multihead weigher and the instrument panel are composed of three parts. In the case of selecting the accuracy of the multihead weigher, the accuracy of the multihead weigher should be slightly higher than the calculated value of the basic theory, because the basic theory is usually limited by objective reasons, such as the pressure resistance of the scale body. The strength is a little bit worse, the characteristics of the instrument panel are not very good, the office environment of the scale floor is relatively extreme, and other factors immediately endanger the accuracy requirements of the scale floor. Therefore, the regulations must be improved from all levels, and economic benefits must be considered to ensure that the goal is achieved. ..

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