A medium speed coal mill

Abstract

The invention discloses a medium-speed coal mill. The medium-speed coal mill comprises a motor, a speed reducer, a lower frame body, a middle frame body, a separator, grinding disc assemblies, grinding roller assemblies, a pressurizing device, a pull rod mechanism, a hydraulic system, a slag discharging device, a lubricating system and a foundation; and the improvement of the medium-speed coal mill is that the shape of grinding roller sleeves of grinding parts is in a centripetal arc bowl shape, the grinding molded lines are still arc-shaped, and the curvature radius of the intermediate diameter of the grinding roller sleeves is 0.5 times to infinity times of the pitch diameter of the mill. The medium-speed coal mill has the positive effects that the shape of the original roller sleeves is changed, and the cross section of the roller sleeves is changed from a tire shape into a centripetal arc kidney shape so that the grinding area of the roller sleeves and grinding disc tiles can be increased, the crushing efficiency of raw coal can be improved within unit time, and therefore the output of the coal mill can be improved; and arc-shaped grinding rollers rotate on the grinding disc tiles along the intermediate diameter of grinding rails of the grinding discs, and therefore the linear speed difference value of the grinding roller sleeves and the grinding disc tiles can be reduced, and the abrasion of the outer side parts of the roller sleeves can be reduced.

Description

technical field [0001] The invention belongs to the technical field of pulverizing and pulverizing equipment, and in particular relates to coal grinding equipment for coal-fired thermal power plants. Background technique [0002] Medium-speed coal mills are widely used in thermal power plants and other coal-fired enterprises, including main motor, reducer, lower frame body, middle frame body, separator, grinding disc assembly, grinding roller assembly, pressurizing device, tie rod mechanism, hydraulic system , slag discharge device, lubrication system, foundation and other components. When the equipment is running, the main motor drives the grinding disc fixed on the reducer to rotate through the coupling, and the grinding disc shoe is fixed on the grinding disc. Under the action of friction, the grinding disc drives the grinding roller to rotate. The raw coal that falls on the grinding tile through the coal falling pipe of the separator is ground by the grinding roller, an...

AI Technical Summary

Problems solved by technology

Affected by the structure of the grinding parts, the amount of raw coal in the grinding area is relatively small, which affects the output of the coal mill; at the same time, due to the large linear velocity difference between the outside of the roller sleeve and the grinding plate tile, the external wear, reducing the service life of the grinding components

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