With the rapid development of China's mining industry, the grinding industry has also received the attention of various enterprises. Raymond mill is composed of main machine, classifier, blower, bucket elevator, electromagnetic vibration feeder, storage hopper, jaw crusher, pipeline system and electric control cabinet. The transmission device of the equipment adopts closed gear box and belt pulley, with stable transmission and reliable operation. What are the performance characteristics of the controller of the automatic feeder of 4R Raymond mill?

The important parts of 4R Raymond grinding equipment are made of thickened high-quality steel, and the wear-resistant parts are made of high-performance wear-resistant materials. The whole machine has high wear resistance and reliable operation. The electrical system of the equipment adopts centralized control, and the grinding workshop can basically realize unmanned operation and convenient maintenance. Moreover, the pipeline and fan system are optimized to reduce the wind resistance and pipe wall wear, so as to ensure the stable increase of output.

We can flexibly configure the transmission system according to the special needs of materials or users to ensure that the system operates in the state. The whole machine of the equipment is of three-dimensional structure, with small floor area and strong systematization. It can form an independent production system from rough processing of raw materials to transportation to powder making and final packaging. The fineness of the finished powder is uniform, and the passing rate is 99%, which is difficult for other grinding equipment.  

If the automatic feeding of Raymond mill is to be realized, the first work to be completed is to detect the working load of the mill in real time, and control the feeder through microcomputer processing and analysis according to the load to realize automatic increase or decrease of feeding. The load of the mill can be reflected by the current of the main machine or the fan of the Raymond mill. After actual investigation, the following results are obtained:

① The conversion range of the host current is large, and the current jitter at the working point is large, which cannot accurately reflect the working load of the mill.

② The current conversion range of the fan is also relatively large, but the fan current is very sensitive when the main engine is loaded. Once the main engine is overloaded, the fan current will quickly drop (Note: the fan current changes in the opposite direction with the load). Therefore, in order to realize automatic feeding more accurately, this design uses the fan current as the input signal, and uses the mature PID control algorithm to drive the feeder to form a complete closed-loop system.