The feeding device is powered by the main circuit of the circuit breaker control system. The machine starts, after the Weighing system starts, the PLC control switch closes, and the motor driving the mixing knife and the motor driving the conveyor belt start; The two motors are separately connected to a fuse. The motor of coarse and fine screw feeding device is controlled by frequency converter respectively, and the control switch of frequency converter is controlled by PLC. The weighing module converts the weighing signal into A voltage signal, which is amplified and adjusted by the transmitter, and converted by the data acquisition card for A/D conversion, and the generated digital quantity enters the dosing controller for processing. These quantities can be displayed in the weighing display, and the motor, push device and discharge valve can also be fed back to adjust the coordinated action. The presets are entered from the keyboard to the controller.

The design of the feeding system adopts vacuum conveying feeding technology. When the vacuum pump starts, a vacuum is generated in the vacuum tank immediately, and the bulk material is transported to the hopper. The filter separates the material from the vacuum pump to prevent the dust from overflowing.

The design of the feeding system uses a conveyor with double helix structure, the double helix structure is installed in an "8" shaped body, with the spiral rotation, the material in the body is subject to a forward thrust forward movement, at the same time, in this process, the material is squeezed, making the body produce a certain sealing effect, and then there is a certain sealing pressure, so, This conveying structure has a good effect on conveying wet materials such as powder, paste and filter cake.

The feeding device mainly includes hopper, feeding device, feeding device, weighing module, power source and control device. Controlled by PLC system, it can realize continuous working cycle of automatic feeding, material conveying, material quantitative weighing and automatic feeding cup. And on the basis of the usual dynamic weighing control mode, compared with its advantages and disadvantages, the operation mode of dual-core weighing material is designed. The working process is divided into three stages:

(1) Material preparation stage.

(2) Coarse weighing stage.

(3) Fine weighing stage.

The last two stages are executed in a cycle after the machine is started until the end signal is given and the whole process is over. First, the operator will put the weighing cup to the position of the conveyor belt, and the weighing cup will be brought to the discharge port of the coarse weighing unit by the conveyor belt, and touch the travel switch; At the same time, the coarse weighing unit starts, when the stroke switch and the preset value of the coarse weighing meet the requirements, the coarse weighing unit will open the discharge port, and the material will fall into the weighing cup; Delay for a certain time, so that all the materials of the coarse weighing unit fall, and then push the weighing cup to the discharge port of the fine weighing unit by the pushing mechanism, and touch the travel switch, at this time the fine weighing unit repeats the action of the coarse weighing unit, completing a coarse weighing and fine weighing process. When the push device pushes the first weighing cup to the discharge port of the fine weighing unit, the coarse weighing unit does not need to wait, and directly starts the next rough weighing. The weighing cup receiving the blanking in the fine weighing unit will be sent to the discharge table by the push mechanism. Double core weighing material can make coarse weighing and fine weighing at the same time, with easy operation, accurate and reliable measurement, high production efficiency.