The weighing Feeder is composed of a weighing silo, a screw feeder and a control device. The weighing silo equipped with a weighing module serves to calibrate the screw scale online and control the material level inside the silo. The horizontal rotary screw feeder, which is made up of a pressure reducing silo, a pressure equalizing silo and a rotor cavity, serves as the pre-feeding device for the metering equipment and forms a closed-circuit control with the screw powder metering scale. Through variable frequency speed regulation, Adjust the feeding amount according to the set value. The spiral powder weighing scale is composed of a motor, a weighing module, a transmission shaft, a feeding device, a discharging device, a scale body and a measuring disc set inside the scale body. After the material enters the scale body, it moves radially outward from the center of the measuring disc as it rotates. During this process, the material is subjected to the action of a spiral. By detecting the size of the screw through the weighing module, an accurate material flow rate can be obtained. The control device is responsible for completing multiple tasks of the entire system, including signal acquisition, status judgment, error correction, operation processing, data display, system regulation, and system communication.

The weighing feeders are fed by their respective feeding screws and discharged through their respective discharge hoppers. The positions of each discharge hopper are marked by the corresponding position switches. Corresponding weighing instruments are configured with weighing raw materials. The PLC controls the position of the material valves and the feeding motor according to the raw material formula. When the batching and weighing start, the PLC controls the material valves to reach the corresponding discharge volume. The frequency converter starts the feeding motor through switch quantity control to start the material feeding and weighing. According to the weighing status signal fed back by the weighing instrument, the PLC controls the frequency converter to adjust the motor speed to control the start and stop, speed and speed of the feeding screw feeding. When the current raw material weighing is completed, the motor is turned off, and the PLC reads the weighing result value of the weighing instrument.

The weighing bin reflects the changing trend of the material flow inside the bin through the display signal of the weighing module. Then, through the material flow regulation circuit, the comprehensive material flow of the feeding weighing bin is adjusted to achieve dynamic control of the material level in the weighing bin. According to the grinding principle of the press material bed, when the press is continuously extruding and running, a continuous and stable material bed needs to be formed between the roller gaps. The material in the material bed is extruded and crushed by the transmission of high pressure by the material bed. A Weighing system is set above the press to force feeding by the gravity of the materials inside the bin, ensuring that the press is in a supersaturated feeding state and enabling continuous material layers to pass through the press.

The feeding process of the press mainly consists of the weighing section, the transmission section and the feeding section. The weighing section includes the hopper, weighing module and cylinder. The transmission section includes feeding valves, three-phase asynchronous motors, and guide rail screws. The feeding section includes a hopper, a frame and a cylinder. The working process of the feeding equipment for the press: Materials enter the weighing hopper through the storage bin. When they reach the set weight, the material door of the weighing hopper opens, and the materials fall onto the feeding valve. The feeding valve then transports the materials to the feeding mechanism hoppers in front of each press. When the press needs materials, the feeding section operates to deliver the materials to the press. There are multiple presses in this control system. The feeding valves travel back and forth to the silo. In the weighing section, three Weighing modules are used to achieve precise weighing of materials. The feeding valve can operate at high and low speeds through the speed regulation of the frequency converter of the three-phase asynchronous motor. According to its process flow, the feeding equipment of the press must meet the following control requirements: (1) The feeding equipment of the press should have both automatic and manual control modes to meet the requirements of automated production and equipment commissioning and maintenance; (2) The weighing module can precisely weigh materials and detect the weight through the touch screen. (3) The feeding valve can recognize the call of the press, determine the direction of travel, and accurately and quickly transport the materials to the call point. When the control system is initialized, each section of the equipment stops at the initial position. In case of any abnormality in each section, an alarm indicator light will sound the alarm.