An overflow ball mill with wedge-shaped liner plate structure and its liner plate installation method

Abstract

Disclosed are a wedge-key-shaped liner plate structure overflow ball mill and a liner plate mounting method thereof. The ball mill comprises an end cover (2) with end cover liner plates (5) at the two ends, a ball mill tube (1), a rubber pad layer (3) in the tube, and tube body liner plates (4), wherein each tube body liner plate is a wedge-key-shaped liner plate of which the two ends are bevel notch surfaces and the inner surface is the protruding arc surface; every two adjacent tube body liner plates are compressed through reverse wedge-key-shaped pressing strips (6) which are pressed into bevel notches; connecting bolts (7) penetrate through a tube body and fixedly connect the wedge-key-shaped pressing strips with the tube body, so that the tube body liner plates are firmly mounted; the bevel notch surfaces, at the two ends, of the tube body liner plates are wedged and clamped together with the end inclined surfaces of the end cover liner plates; the tube body liner plates and the end cover liner plates are formed through one-time casting of a high manganese chromium alloy which contains 10-20% of manganese and 1-5% of chromium. The wedge-key-shaped liner plate structure overflow ball mill is resistant to abrasion, durable, easy to mount and dismount, good in sealing performance and low in manufacturing cost.

Description

technical field [0001] The invention relates to the technical field of a large overflow ball mill structure. Background technique [0002] The ball mill is the main equipment used for grinding in mineral processing. The mill liner is the wear-resistant layer between the grinding body (grinding medium) and the grinding material and the barrel of the ball mill. It is used to protect the barrel and end cover of the ball mill. , so that it is free from the direct impact and friction of the grinding body (grinding medium) and the grinding material, prolonging the service life. The material, thickness and shape of the liner are closely related to its grinding wear resistance time and grinding efficiency. The thicker the liner is, the longer the wear-resistant service time of the liner is, but the effective volume of the grinding machine will be smaller and the grinding capacity will be reduced; the smaller the thickness of the liner is, the greater the effective volume of the gri...

AI Technical Summary

Problems solved by technology

At present, the materials used for ball mill liners are mostly manganese steel materials. Manganese steel materials have sufficient wear resistance and impact resistance toughness. The harsh working environment of the type ball mill, its wear resistance is still not ideal

[0004] In addition, the current large-scale overflow ball mill usually adopts through-hole liners, which have a large number of liners and many liner connecting bolts. Taking the MQY3660 overflow ball mill as an example, the number of liners in the large grinding cylinder is 230, and the number of liners is large. There are 576 connecting bolts for the liner of the grinding cylinder, and each through-hole liner is fixed by two through-hole bolts in the middle of the liner. After the tails of the fixing screws become smaller, the through liner is often easy to loosen, leak slurry, and even the liner breaks and falls off, which affects normal production; secondly, due to the large number of through liner and connecting bolts, it is necessary The workload is large, time-consuming, and labor-intensive, which has a great impact on production; and the cost of bolts required for each liner replacement is relatively high; at the same time, there are many bolt holes in the grinding body, which may easily cause slurry leakage and affect the grinding process. environmental sanitation

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