The screw Feeder adopts the mode of multiple production lines in one location. The design uses a multi-channel system of "one machine for multiple feeders", among which the activation pre-feeding device is shared as one set, and the quantitative feeding device is designed for multiple channels. The activation pre-feeding device mainly consists of a controllable feeding component, a weighing chamber, a weighing sensor, an activation feeder and a support frame, which serves to pre-feed and stabilize the flow. The micro quantitative feeding device mainly consists of an isolated activation chamber, a negative pressure suction type micro screw feeding equipment, and a impeller pneumatic auxiliary jet cleaning device, achieving the function of stable and quantitative feeding. The pneumatic suction conveying device is composed of a pneumatic suction pump and a discharge spray-blowing assist device, which is responsible for forcefully and thoroughly blowing the materials to the designated process pipeline. All links of the entire system equipment are fully sealed, ensuring that there is no dust flying when the powder passes through, making the on-site use clean and environmentally friendly.

During the operation of the Weighing system, based on the characteristics of the micro-powder materials, it is first necessary to ensure that the material pressure at the outlet of the weighing feeding bin remains stable. A controllable impeller feeder and pneumatic gate valve are selected as the pre-feeding equipment of the weighing bin, installed above it. Their function is to reasonably control the height of the material surface in the weighing bin. Control the operation of the activated feeder as needed to ensure the smooth and stable flow of the micro-powder materials, and roughly adjust the flow rate to enable the materials to stably enter the micro-screw quantitative feeding device. The control system, based on the comparison result between the instantaneous flow value of the micro screw feeding equipment and the set value, adjusts the rotational speed of the micro screw, ensuring that the instantaneous value always tracks the set value, thereby achieving accurate measurement and stable control of the micro powder.

In addition to measuring weight, the screw feeder also has additional electronic tasks, such as calculating the mass flow rate during mass changes and adjusting the mass flow rate according to the pre-given rated value. Both the quantitative container and the quantitative mechanism for loading materials are weighed completely. The material flow leaves the quantitative mechanism in a spiral descent manner, and the weighing electronic part measures the weight at fixed time intervals (a few seconds). In the case of a drop, the weight decrease per unit time is calculated from the weight difference between the two measured values. The regulator at the back is used to calculate the actual mass flow rate and compare it with the rated mass flow rate.

The magnitude of the force acting on the quantitative feeder is converted into A corresponding voltage signal by the weighing module. This voltage signal is amplified by the amplifier and then converted into a discrete digital signal by A/D. This digital signal is sent to the PLC for processing and converted into a judgment value. Compare the judgment value with the reference value. When the value is reached or exceeded, the PLC stops the electromagnetic screw feeder to discharge materials, triggers the hopper door opening device to open the discharge door for unloading, and the materials fall into the packaging container, completing one filling cycle.

The material is continuously conveyed by the screw. When passing through the piezoelectric weighing module per unit time, under the gravitational force of the material, the screw, the sensor per unit time, etc., the sensor sensing element generates a charge quantity signal proportional to it. This signal is processed by the sensor circuit through charge amplification, filtering, etc., and then the useless signals caused by the screw, the sensor per unit time, etc. are removed by the tare and zero adjustment circuit. The useful signal after tare is discretized by the sampler/retainer. The analog signal is converted into A digital signal by the A/D converter and sent to the PLC control system to wait for relevant operations, processing, and the relevant results are stored on the touch screen. The PLC displays all the discretized signals of a certain period after relevant calculations and processing.

The powder materials are smoothly fed into the weighing feeding bin through the feeding device. The stable pre-feeding is maintained by the operation of the activated Feeding machine. According to the needs, they are filled into the material area of the micro screw feeding equipment. The variable frequency speed regulation motor transmits power to the micro screw feeding equipment through the reducer and the main shaft, driving the micro screw to rotate. As the micro-screw rotates, the powder-filled material area moves to the discharge port and falls into the wind-powered suction pump. Driven by the conveyed air, it quickly reaches the lower-level process equipment. Meanwhile, based on the weight loss signals collected from the weighing bin, the feeding is corrected online in stages. The auxiliary cleaning device also starts working simultaneously to assist in cleaning the materials in the discharge area, ensuring the completeness of the discharge.