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Author: Smartweigh–Multihead Weighter
During the application process of the multihead weigher, it is mainly based on the change of the weight of the raw material in the scale body to continuously and accurately measure the raw materials. The appearance of the multihead weigher will gradually replace the original electronic belt scale, screw scale, and even Accumulative scales, as a brand-new measurement verification method, are more and more widely used in metallurgy, mining, chemical plants, and chemical fiber energy manufacturing industries. All the control and processing functions in the multihead weigher are performed by it, and the control panel of its equipment will effectively calculate the weight change rate of the scale body within the working time based on its signal as the actual instantaneous flow rate , Then compare it with the set target flow, and output a 4-20mA current signal after PID calculation to change the output frequency of the soft starter of the feeding motor. In this way, the speed ratio of the motor can be changed to make the actual feeding amount as close as possible to the set target flow rate, so as to achieve the purpose of precise feeding.
If the multihead weighter performs PID control according to the signal transmitted by the controller, because the weight change experienced by the controller in this time range will be reduced, which may cause the signal to be out of frame and control the prohibition, so it is also necessary to set the Set the filling time, which starts counting down when the gate valve is closed. The feeding motor of the multihead weigher will keep the same frequency before feeding during the period from the beginning of feeding to the end of the feeding time. In other words, the multihead weigher is fixed during the whole process. Frequency operation—static data manipulation. There are many main reasons why the multihead weigher affects the working precision of its equipment during operation, such as gas flow, such as fans in the workshop, central air conditioners, and wind blowing, etc. are all common factors that affect the precision of automatic multihead weighers Hazards, road vibration, because the production workshop is noisy, the equipment often runs to cause road vibration, and even the uneven road surface of some production workshops will also affect the precision of the automatic multihead weigher.
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