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How Does Raymond Mill Work?

xinhai 2020-01-28(06:01:03) 2549 0

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Raymond mill is a commonly used equipment for processing non-metallic mineral grinding powder. Its structure is mainly composed of a host, an analyzer, a fan, a finished product cyclone separator, a fine powder cyclone separator and an air pipe. Do you know how does it work? 

Now, here will explain in detail how Raymond mill is working.

1. The working principle of  Raymond mill

After Raymond mill crushes the bulk raw material to the required feed size, the material is conveyed to the storage bin by the bucket elevator, and then sent to the grinding chamber of the main engine by the electromagnetic feeder. The material entering the grinding chamber is ground between the grinding roll and the grinding ring. The grinding powder is carried by the air flow of the fan to the analyzer for grading, and fineness is achieved. The required fine powder is transported through an air tube to a cyclone collector, separated and collected, and discharged as a finished product.


2. The steps of operation of Raymond mill

  • Start the bucket elevator;

  • Start the jaw crusher;

  • After the material is stored in the silo, start the analysis machine;

  • Start the blower (start at no load and load it after normal operation);

  • Start the Raymond mill host, and the electromagnetic vibration feeder will start immediately after starting the host.

At this time, the grinding work of Raymond Mill is started.

3. The main working process of  Raymond mill

The working process of the main engine is to drive the central shaft to rotate by means of the transfer support equipment. The upper end of the shaft relates to the plum blossom rack. The rack is equipped with a universal education device for grinding rollers to form a swing fulcrum. It not only revolves around the center, but also revolves around the grinding ring. 

At the same time, the shovel cutter and the grinding roll throw the material shovel into the grinding roll and the grinding ring during the same rotation process. A cushion layer is formed, which is crushed by the centrifugal force (i.e. extrusion force) generated by the rotation of the grinding roll, thus achieving the purpose of pulverizing.

The analyzer rotates the blades on the turntable through a speed motor and a two-stage deceleration to form a grading effect on the powder. The speed of blade rotation is adjusted according to the size of finished powder. If we want to get finer particles, we must increase the speed of the blade, increase the contact between the blade and the powder, make the unqualified powder thrown out by the blade and separate from the airflow, the coarse particles fall into the grinding chamber for re-grinding due to the action of self-gravity, and the qualified powder is sucked into the large cyclone collector with the airflow through the blade.

 After separating the powder from the powder, the powder is collected. The cyclone collector plays an important role in the performance of the mill. When the air with powder enters the collector, it is in a high-speed rotating state. When the air and powder are separated, the air flow moves to the bottom of the cone with the cone wall contracting to the center (natural length of the air flow). A rotating upward airflow cylinder is formed when the powder is collected.

Because the upward rotating air core is in a negative pressure state, the sealing requirement for the lower end of the collector is very high. It must be strictly separated from the outside air. Otherwise, the collected powder will be taken away again by the core air flow, which directly affects the output of the whole machine. Therefore, the lower end of the collector is equipped with a powder lock, whose function is to keep the outside positive pressure gas.

Isolated from the negative pressure gas of the collector, this is a very important component. If the tongue plate of the collector is not tightly sealed, it will cause no powder or less powder, which will affect the output of the whole machine.


These are the details about raymond mill work. In order to ensure the normal operation of the Raymond mill, the staff should understand the entire process flow and do the maintenance and repair work of each component.

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