Anatomy: the use of bearings in coal mine occupations

Source: China Bearing Network Time: 2014-04-24

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Coal mine machinery and equipment is a large-scale mechanical equipment excavated in coal mine; transport; transport; including mining machine; conveyor; well roadway excavation equipment; underground auxiliary transportation, vehicle equipment; mine winch; ventilation and dust removal equipment; coal washing Equipment; cranes; special vehicles, etc. He also has a large demand for bearings; there must be a great demand for quality. Therefore, in the process of purchasing bearings, we must pay attention to the characteristics of coal mine machinery and equipment.
The mechanical equipment produced in the coal mine has the following characteristics:
1. The working environment is bad; the equipment is surrounded by dust, water vapor and harmful gases.
2, working conditions are harsh; most mechanical equipment is operating under high-speed, heavy-duty, oscillating, shock, collision and medium corrosion conditions,
3, long running time; most of the machinery and equipment do not stay up all night;
4. Poor smooth conditions; because of the harsh environment; harsh working conditions; plus short stop time; this makes mechanical parts not outstanding smooth and protective.
Therefore, the economic losses formed each year are surprisingly large; as long as the correct bearings are selected; the protection is carried out regularly; the protection is timely; the quality of the protection is improved; the production equipment is guaranteed to operate in an outstanding state; the mechanical wear of the coal mine is reduced; Life expectancy; complete high-yield, efficient and safe production of coal; effective mining operators

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Tapping Screw

Although there are many types of tapping screws, they all have the following similarities:
(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.

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