Internal Structure Of Grinding Mill

Internal Structure Of Grinding Mill

Briefly describe the internal structure and characteristics of grinding mill

There are many kinds of metal ore resources in China, but the quality of most minerals is poor, miscellaneous and fine. In order to solve the outstanding problems in the economic, technical and environmental protection aspects of mining development, domestic metal mining enterprises actively introduce, digest and absorb foreign new and efficient mining production equipment. In this market background, the grinding mill is the first to obtain research and demonstration, and began to use high-efficiency crushing equipment in domestic metal mining enterprises. It is also the mine production equipment that is most concerned by the domestic mining industry. Below, I will briefly describe the internal structure and characteristics of the grinding mill:

Grinding Mill structure

Grinding mills are mainly composed of racks, rollers, bearings, transmission, feeding, hydraulics, lubrication and control systems. The motor is connected to the roller subsystem (the bearing and the roller mounted on the bearing) mounted on the horizontal rail of the frame through the universal joint and the reducer. The roller that cannot slide on the slide rail during operation is a fixed roller. The sliding roller is used as a moving roller for small sliding. The independent hydraulic system at both ends of the moving roller pushes the moving roller to the fixed roller to generate the pressure required for the crushing. There is a spacing block between the moving and fixed roller bearing seats to prevent the roller from contacting. The fixed roller and the moving roller have the same structure and are interchangeable.

The wear parts of the grinding mill are the roll sleeves of the rolls, and the inverted triangular cheeks for retaining the ends of the rolls. The roller sleeve and the cheek base are made of wear-resistant alloy steel, and have a wear-resistant protective layer on the contact surface with the mineral. At present, the roller sleeve generally adopts the surface of the tungsten carbide hard alloy column nail. When the grinding mill works, the material is filled between the columns to form a self-generated anti-abrasive pad to protect the roller surface. For moderately abrasive ores, the service life of such rolls is generally over 10,000 hours. In recent years, Koeppern has developed a wear-resistant roll sleeve with a surface powder metallurgy treatment. The base of the roll sleeve and the wear-resistant surface are seamlessly integrated, which overcomes the difficulty of repairing the stud and the brittle fracture, and the edge effect is large. The weakness has achieved self-repairing, improved wear resistance and further improved service life. Both forms of the sleeve can be removed and replaced after the service period.

Grinding mill working principle

The material to be pulverized in the feed bin of the grinding mill enters the crushing chamber of the grinding mill through the feeder of the adjustable opening size (the flow space is continuous and continuous, and the material column of 3 m or more can be realized to ensure the formation Sufficient ore pressure), the material packed in the crushing chamber is forced into the space of continuous compression under the dual action of the relative rotation of the roller and the weight of the column, and is compacted (the density of the ore cake reaches the true density of the ore) 0. 85 times), when it reaches a certain pressure, it is crushed or microcracks are formed inside the particles.

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