Interpretation of the grinding principle of Raymond mill in the grinding production line

Raymond milling process (grinding material process)

After the bulk material is crushed to the required particle size by the jaw crusher, the material is sent to the storage hopper by the hoist, and then uniformly and quantitatively fed into the Raymond mill main grinding chamber by the oscillating feeder for grinding, after grinding The powder is taken away by the fan airflow.

The main operation of the Raymond Mill is to roll through the center shaft of the transmission equipment. The upper end of the shaft is connected to the plum blossom frame. The frame is equipped with grinding roller equipment and constitutes a swinging fulcrum. The grinding roller revolves around the grinding ring. The effect of the conflict is spinning. The airflow is then drawn into the blower by the return air duct at the upper end of the large cyclone collector.

In the grinding chamber, due to the certain moisture content of the material to be ground, the heat generated during grinding causes the gas transpiration in the grinding chamber to change the gas flow rate, and the pipes of the whole machine are not tightly connected, so that the outside air is sucked in, so that the airflow of the recirculating airflow is added, resulting in grinding. The machine has a small amount of powder and even a blasting machine. In this regard, the new European version of the ladder-type mill has been equipped with an explosion-proof method on the upper part of the body, which can prevent the accidental damage caused by the blasting of the Raymond mill. The condition can also be adjusted to balance the airflow by adjusting the residual air duct between the fan and the main engine, and the excess gas is introduced into the small cyclone collector, and the fine powder brought into the residual gas is collected, and then the upper part of the small cyclone collector is collected. The exhaust pipe is discharged into the atmosphere or introduced into the dust collector to purify the exhaust air. However, the skill requirements of the operating staff are relatively high, and the demand is found and adjusted in time.

During the grinding process of R Raymond mill, the powder separator (analyzer) passes through the speed regulating motor and rotates through 60 blades on the secondary deceleration rotor to form a classification effect on the powder. The high-pressure Raymond mill airflow system is closed and recurrent, and it is recurrent in positive and negative pressure conditions. The lower end of the plum blossom frame is equipped with a blade system, the orientation of which is at the lower end of the grinding roller, and the blade and the grinding roller are thrown into the grinding roller and the grinding ring during the same turning process to form a cushion layer, and the material layer is subjected to the grinding roller. The centrifugal force that occurs outward by the rotation (ie, the squeezing force) crushes the material, that is, the intention to achieve the milling. The powder is sorted by the powder sorting machine, and the fine powder conforms to the airflow and enters the large cyclone collector through the pipeline, and is collected separately, and then discharged through the powder tube is the product powder.

If you want to obtain finer-grained powder, you must advance the blade speed of the high-pressure Raymond mill (and also pay attention to the cooperation of the wind speed of the fan), so that the blade and the powder are added in contact, so that the undesired powder is thrown by the blade to the outer wall. It is separated from the center airflow, and the coarse powder falls into the grinding chamber for re-grinding due to the effect of gravity. The qualified product powder is sucked into the large cyclone collector by the blade with the airflow. After the effect of the dust collector, the airflow and the powder are separated. , the powder was collected.

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