Variable-frequency automatic filling machine
The variable-frequency automatic filling machine can achieve real-time detection of the filling weight and real-time opening and closing of the solenoid valves during the filling process. It adopts a three-stage feeding method, with raw materials fed in at different speeds in sequence. One variable-frequency drive controls the motor, and the PLC controls the variable-frequency drive to adjust the speed through different combinations of output switch quantities, achieving rapid feeding, slow feeding, and precise feeding. When the weighing starts, rapid feeding is carried out. When the rapid feeding predicted value is reached, slow feeding begins; when the slow feeding predicted value is reached, precise feeding begins; when the total filling weight reaches "target weight - pipe material weight - allowable error", feeding stops. Among them, the pipe material weight is the weight of the material remaining in the pipe after the motor stops rotating and continuing to flow into the weighing bucket.