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Author: Smartweigh–Multihead Weighter
With the improvement of the regulation of continuous, accurate and accurate measurement of raw materials, especially solid raw materials, in the whole process of industrial production, the multihead weigher has resulted in the continuous, accurate and accurate measurement of raw materials according to the change of the net weight of raw materials on the scale body, replacing the original electronic belt scales and spiral scales. , and even accumulation scales, as a new measurement method, have been more and more widely used in metallurgy, mining, chemical plants, and textile industries. The weighing platform, the loading bin and all the machinery and equipment functioning on the weighing platform are used as the entire weighing body of the multihead weigher. The sensor continuously transmits the net weight change of the weighing body to the multihead weigher control instrument, and calculates the unit time according to the data signal. The net weight elastic coefficient of the inner scale is used as the specific instantaneous total flow. Then compare it with the set overall target total flow. After PID calculation, output a 4-50mA current flow data signal, change the output frequency of the soft starter of the feed motor, and change the speed ratio of the motor to be as close to the set overall flow as possible. The target total flow, to achieve the purpose of the appropriate knife.
In order to better complete the continuity and measurement accuracy provided by the multihead weigher, the upper silo must be equipped with a large and medium-sized raw material warehouse that can be continuously supplied and a fully automatic gate valve that can be operated and replenished. Set the upper limit value and lower limit value of replenishment in the control instrument. When the net weight of the control instrument scale reaches the lower limit value of replenishment, the data signal of opening the replenishment valve will be transmitted, the valve will be opened, and the raw materials in the warehouse will be connected to the Loading silo, the net weight of the scale is increased. When the net weight of the control instrument scale reaches the set supplementary upper limit value, the data signal of closing the gate valve is sent out, and the gate valve is closed.
When the replenishment time delay is over, the multihead weigher automatically restores the real-time control, that is, operates the supply motor according to the data signal sent by the sensor. The whole process of the operation of the multihead weigher goes back and forth like this.
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