The mining industry plays a crucial role in providing resources to sustain daily life. Mining equipment typically operates and continues to operate under extremely harsh conditions. As a key component of these devices, mining bearings need to withstand extremely harsh environments. This type of bearing must be sturdy, durable, withstand heavy loads, and provide high reliability to meet the specific needs of mining applications.
Specialized in mining, mineral processing, prospecting machinery is known as mining machinery and equipment, mining operations in the application of a large number of cranes, conveyors, ventilators and drainage machinery are collectively known as mining machinery and equipment. Mining machinery is a kind of processing ore, make low quality ore useful machinery. To separate valuable minerals from gangue. In a narrow sense, directly used in mineral mining and rich selection and other operations of machinery. Including mining machinery and mineral processing machinery. Broadly speaking, prospecting machinery also belongs to mining machinery.
Mining operations will be used in a lot of professional mechanical equipment is roughly divided into mining equipment, mineral processing equipment, and prospecting equipment. Mining machinery refers to the machinery directly used in mineral mining and beneficiation operations, including mining machinery and mineral processing machinery. The working principle and structure of prospecting machinery are mostly the same or similar to mining machinery, broadly speaking, it is also a kind of mining machinery. A large number of cranes, conveyors, ventilators and drainage machinery are also used in mine operations.
The coal industry in China during the period of "11th five-year plan" will be the new scale of coal mine 300 million tons, to adjust industrial structure, vigorously integration, reforming the existing coal mine, close the small coal mine, eliminate backward production capacity, to speed up the construction of large coal base and modern large mines, this for the development of mining machinery equipment companies in China provides a good opportunity.
Characteristics of bearing used in mining machinery
1. Most of the jaw crusher is used outdoors. Its working environment is very poor, which brings many adverse factors to the installation, use and maintenance of bearings.
2, because it is broken stone, dust is particularly large. If the seal fails, dust entering the bearing will aggravate bearing wear.
3, the bearing in the jaw crusher mainly bears a lot of radial load. In particular, it is often subjected to irregular and sudden impact load. This irregular and sudden impact load is very destructive to the bearing, which is easy to cause the inner or outer ring fracture.
4, the bearing lubrication condition in jaw crusher is also poor, not often refueling or irregular replacement of lubricating oil is the main reason for the early wear of bearing.
Two kinds of lubricating oil failure cases:
1, the removed bearing no grease
2, grease has dried up lubrication failure
Special bearing features for mining equipment
Cage: copper cage, high strength, good toughness; Special split cage design, more suitable for mining industry working occasions.
Inner ring: Use double raceway to cut into the high precision raceway.
Rollers: The processed rollers are sorted for many times to ensure that the dimension tolerance of rollers in the same bearing is 2UM.
Outer ring: the surface of the outer ring has a refueling hole and oil groove;
After two tempering stabilization treatment, it has higher impact resistance.
Clearance: The special clearance standard is that bearings have longer service life on mining equipment.
Anastomosis: BY CONTROLLING THE curvature of the roller, the ANASTOMosis of the contact surface between the roller and the raceway is increased from 60% to 80%-90%.
Matters needing attention in the process of bearing installation
The installation of straight hole bearing adopts oil heating method: it is equipped with non-corrosive mineral oil and oil pool heating, the oil temperature is controlled at 80-100℃, can not exceed 120℃, usually 93℃, put the bearing in the oil for 20-30 minutes, make it expand enough, so that it is easy to set the shaft. When the bearing is still hot, make it perpendicular to the shoulder of the shaft, and fix it with a locking hot ring splint. After the bearing is cooled, the locking nut should be tightened.
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