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Working Principle of Different Grinding Mills

  • Raymond mill is a kind of common grinding equipment. On the basis of economic and technological development, Raymond mill has developed into several special types, such as powerful mill, ultrafine mill, and high-pressure mill.

    As a powerful mill, it adopts a high-pressure device on the basis of ordinary Raymond mill, and a high-pressure spring is set in the grinding device to increase the grinding pressure between the grinding roller and the grinding ring by 1.2 times. When the grinding roller and ring are worn to a certain extent, the length of the high-pressure spring is adjusted to keep the constant grinding pressure between the grinding roller and ring, so as to ensure the stable quality.

    At the same time, in the grinding device, through technical improvement, the contact area between the grinding roller and the grinding ring is large, which avoids the phenomenon that small particles can not be continuously crushed in the uneven gap in the general grinding machine. According to the Bernoulli equation calculation of gas flow and the results of simulation experiment, the geometric shape of the blade in the fineness classifier is changed, and the inclination angle and relative clearance of the baffle are readjusted, so that the ultra-fine powder entering the classification can be separated effectively.

    As a high-pressure micro powder mill, it is mainly composed of main machine, blower, ultra fineness analyzer, finished product cyclone dust collector, bag filter and connecting air pipe. According to the needs of users, it can be equipped with auxiliary equipment such as hoist, storage bin, electric control cabinet, feeder, crusher, etc. In the grinding chamber of the micro powder mill, the grinding roller assembly is suspended on the grinding roller hanger through the cross arm shaft. The grinding roller hanger is fixedly connected with the main shaft and the spade rest. The pressure spring is tightly pressed on the outer end of the cantilever of the bearing chamber of the grinding roller by the tension rod. With the cross arm shaft as the support point, the grinding roller is tightly pressed on the inner circular surface of the grinding ring by the spring pressure. When the motor rotates through the transmission device, the grinding roller is pressed on the inner circular surface of the grinding ring, The blade mounted on the blade rack rotates synchronously with the grinding roller, and the grinding roller rotates around itself while rolling on the inner circular surface of the grinding ring. The analyzer drives the impeller of the analyzer to rotate through the motor drive device, and the speed adjustment of the analyzer determines the fineness of the powder.

    Ultrafine mill is mainly composed of main machine, fan, separator, powder collector, dust collector and other parts. The main machine is divided into three parts: crushing room, plug room and fan room. During the operation of the machine, the material is put into the crushing chamber through the feed port, and then crushed by the impact between the blade fixed on the spindle and the liner plate of the casing and the shearing of the high gas injection. The crushed material enters the fan chamber by stages through the plug compartment, and the material enters the separator by the blowing of the wind wheel and the gravity of the machine, and then is treated by the separator again, The coarse material is returned to the crushing chamber by the return nozzle for re crushing, the finished material is led out by the induced draft fan and packed in the powder collector, and the residual air is discharged by the dust removal device.

    It can be seen that these kinds of mills developed on the basis of Raymond mill have great advantages, which have an important impact on the development of its grinding industry. On this basis, Raymond mill will have further development.