How to choose a multihead weigher?

Multihead weigher, also called combination weigher, is a fast quantitative weighing and packaging equipment. The multi-head weigher originated in the 1970s. Its weighing principle comes from the permutation and combination algorithm in mathematics. At present, the 10-head and 14-head combination weighers are the most widely used in the world. The 10-head scale has 10 independent weighing units, and the 14-head scale has 14 units. Now take the 10-head scale as an example: the material is distributed to the 10 weighing units through the independent feeding device above. Due to the size of the material particles, The uniformity and thickness of the material layer are different each time the material is fed, so the weight of the material falling on the weighing unit will be different each time. Now suppose the weight of the material falling into the weighing unit No. 1 to No. 10 (unit In grams) are 28.5, 25.5, 31.9, 38.7, 20.0, 20.5, 33.3, 36.0, 24.0, 19.1, and the target weight we need is 100±0.5. From the above weight value, we can find: No. 1 (28.5 ) + No. 3 (31.9) + No. 6 (20.5) + No. 10 (19.1) u003d 100 grams. I want to add the weight value of several weighing units equal to the target weight value of 100±0.5 grams. This is the biggest difference between the combination scale and the ordinary electronic scale. Because the combination scale uses a high-performance weight sampling chip and a data processing chip, the material is from The total time from falling to the weighing unit to reading the weight value, and then combining to calculate the target weight value is about 0.7 seconds, which ensures the need for rapid quantitative weighing. The first thing to consider when choosing a multi-head weigher is whether the weighing speed of the multi-head weigher matches the production line. General combination weigher quantitative weighing and packaging system is mainly composed of combination weigher, vertical packaging machine, vibrating feeder, Z conveyor, support platform, etc. The weighing speed of the multihead weigher mainly depends on the number of weighing hoppers involved. The more weighing hoppers, the faster the weighing speed. If users have ready-made packaging machines, they should refer to the operating speed of the packaging machine when choosing the speed of the multi-head weigher, but the speed of the multi-head weigher should be slightly higher than that of the packaging machine. speed. Secondly, we must consider the product's weighing range, material size, shape, and viscosity, etc. If the weighing range is large, the material should be considered to be a combination weigher with more heads such as 14; if the material is sticky, it will contact the material. The feeding hopper and weighing hopper should have anti-sticking properties. Generally, the concave-convex type weighing hopper will be selected, otherwise the speed and accuracy of the multi-head weigher will be affected. The third factor is the weighing accuracy of the multihead scale. Since the multi-head weigher is a very mature product, the performance of each multi-head weigher is not very different, but because the accuracy of the load cell used in the measurement is different, the weighing accuracy of each multi-head weigher will also have some differences. The multihead weigher basically does not need to be repaired during use, and only needs to be cleaned daily. In addition, food companies should pay special attention to two points in the process of using multi-head scales: First, maintain the continuity, stability, and rationality of the supply as much as possible. If the supply fluctuates, make the weighing hopper Too much or too little material will cause the difficulty or failure of the combination of the multi-head weigher, which will reduce the speed and accuracy of weighing; secondly, the weighing hopper should be as light as possible when disassembling and assembling the weighing hopper. Excessive force will cause the load cell Damaged affects the weighing accuracy and even cannot be used.

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