The actual operation method of weightlessness scale in the industrial field
As raw materials, especially solid raw materials, continue to increase in appropriate and accurate measurement and control regulations during the entire process of industrial production, a weightlessness scale has been created. Based on the change in the net weight of the raw materials on the scale, the raw materials are continuously and accurately measured, replacing the original electronic belt scale and spiral scale. , And even accumulation scales, as a new measurement method, have been more and more commonly used in metallurgy, mining, chemical plants, and textile industries. The weighing platform, the loading bin and all the machinery and equipment on the weighing platform are used as all the scales of the weightless scale. The sensor continuously transmits the net weight change of the scale to the weightless scale control instrument, and calculates the unit time based on the data signal The elastic coefficient of the net weight of the inner scale body is taken as the specific instantaneous total flow. Then compare with the set overall target total flow. After carrying out PID calculation, output 4-50mA current data signal, change the output frequency of the soft starter of the knife motor, and change the motor speed ratio, as close as possible to the set overall The target total flow rate, to achieve the goal of the appropriate knife. In order to better complete the continuity provided by the weightlessness scale and the accuracy of the measurement verification, the loading bin must be equipped with a large and medium-sized raw material warehouse that can be continuously provided and a fully automatic gate valve that can be operated and supplemented. Set the supplementary upper limit value and supplementary lower limit value in the control instrument. When the net weight of the control instrument scale reaches the supplementary lower limit value, a data signal to open the supplementary valve is sent, and the valve is opened. The raw materials of the warehouse are connected to Load the 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, a data signal to close the gate valve is transmitted, and the gate valve is closed. When the replenishment time delay is completed, the weightlessness scale is fully automatically repaired and controlled in real time, that is, the motor is operated and supplied according to the data signal transmitted by the sensor. The whole process of the operation of the weightlessness scale is so repetitive.