Environment of ore beneficiation is complex and bad. At work, crushing machines in ore beneficiation line often break down. The reasons causing equipment failures are various, including unreasonable design of ultrafine mill equipment, improper management and maintenance in operation process and so on. Crushers in ultrafine mill line are mainly used to crush and process ores with high hardness, which have big workload and long working time. Hence, wearing problem of these crushing machines is very serious, which is also the reason leading to short lifespan of equipment. Crushing is the link which is most seriously worn in ultrafine mill process. While coarse crushers are the machines directly contacting with ores, which are mainly responsible for crushing raw ores into suitable sizes that fits for medium and fine crushers. Therefore, abrasion of coarse crushers is the most serious. Here, the experts of SBM Machinery simply talk about abrasion and maintenance methods of commonly used crushers in ultrafine mill line.
1. Abrasion of coarse crushers
Commonly used coarse crushers are mainly jaw crusher and gyratory crusher. The seriously wearing part of jaw rock aw crusher is toothed plate. Because in periodical working process, toothed plate of jaw crusher is loaded or unloaded periodically. Hence, the material strength of toothed plate should be very high. Meanwhile, the toothed plate is often deformed or worn due to long-term immersion of high hardness ores and then being fractured. Under normal conditions, toothed plate is fixed on cast steel by high manganese steel plate. After having used for a period of time, the high manganese steel plate should be turned around for reusing or directly replace new high manganese steel plate. Wearing part of gyratory crusher is lining board. Because in using process of crushers, impact of the lining board is the biggest, so its abrasion is the most seriously. Therefore, materials of the lining board of gyratory crusher should be equipped with high strength and wear resistance.
2. Maintenance methods of coarse crusher
In general, quality is the precondition of highly efficient operation and production of equipment. scientific and reasonable maintenance is fundamental guarantee of long-term operation of equipment. So, purchase and daily maintenance of coarse crushing equipment are fundamental starting points of long-tem running of equipment. Firstly, selection of coarse crushers should accord with ore types and form of mines. It's well known that the same work can select different machines to complete, but the effect is not necessarily the same. Hence, when choosing coarse crushing equipment, we should be cautious and combine with actual situation so as to ensure that the selected equipment satisfy characteristics of minerals to the greatest extent. Even the same minerals, we should also carry out the specificity monitoring so as to select optimal equipment.
Secondly, we should also use the equipment with new technology and materials as far as possible, which can't rely on old high manganese steel materials. We can select equipment with high degree of automation. Thirdly, we should regularly check important parts of equipment so that we can find and solve problems in a timely manner. When it's necessary, we can stop production to carry out inspection so as to avoid unnecessary lose. Lastly, wear resistance of materials of equipment should be high, thus we can discover frequent troubles and other wastage beyond normal range when the equipment is in normal maintenance stage.

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