A medium speed coal mill

A coal mill, medium-speed technology, applied in the field of coal grinding equipment in coal-fired thermal power plants, can solve the problems of reducing the service life of the grinding parts, increasing the external wear of the grinding roller sleeve, affecting the output of the coal mill, etc. The effect of increasing the grinding area, improving the service life and increasing the output

Active Publication Date: 2019-09-17
CHANGCHUN POWER GENERATION EQUIP PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • A medium speed coal mill
  • A medium speed coal mill
  • A medium speed coal mill

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] refer to figure 1 , figure 2 , image 3 , the medium-speed coal mill of the present invention includes a main motor 1, a reducer 2, a lower frame body 3, a middle frame body 4, a separator 5, a grinding disc assembly 6, a grinding roller assembly 7, a pressurizing device 8, a pull rod mechanism 9, a base 10. Hydraulic system (not shown), slag discharge device (not shown), lubrication system (not shown). The improvement made is that the shape of the grinding roller sleeve 7-1 assembled by the grinding roller is tire-shaped and centripetal arc bowl-shaped (the grinding line is still arc-shaped), and the curvature radius of the middle diameter Rt of the grinding roller sleeve is taken as The pitch circle diameter Dj is 3000 times, and the running track of the grinding roller is consistent with the middle diameter of the grinding track of the grinding disc.

Embodiment 2

[0015] refer to figure 1 , figure 2 , image 3 , the medium-speed coal mill of the present invention includes a main motor 1, a reducer 2, a lower frame body 3, a middle frame body 4, a separator 5, a grinding disc assembly 6, a grinding roller assembly 7, a pressurizing device 8, a pull rod mechanism 9, a base 10. Hydraulic system (not shown), slag discharge device (not shown), lubrication system (not shown). The improvement made is that the shape of the grinding roller sleeve 7-1 assembled by the grinding roller is tire-shaped and centripetal arc bowl-shaped (the grinding line is still arc-shaped), and the curvature radius of the middle diameter Rt of the grinding roller sleeve is taken as The pitch circle diameter Dj is 2000 times, and the running track of the grinding roller is consistent with the middle diameter of the grinding track of the grinding disc.

Embodiment 3

[0017] refer to figure 1 , figure 2 , image 3 , the medium-speed coal mill of the present invention includes a main motor 1, a reducer 2, a lower frame body 3, a middle frame body 4, a separator 5, a grinding disc assembly 6, a grinding roller assembly 7, a pressurizing device 8, a pull rod mechanism 9, a base 10. Hydraulic system (not shown), slag discharge device (not shown), lubrication system (not shown). The improvement made is that the shape of the grinding roller sleeve 7-1 assembled by the grinding roller is tire-shaped and centripetal arc bowl-shaped (the grinding line is still arc-shaped), and the curvature radius of the middle diameter Rt of the grinding roller sleeve is taken as The pitch circle diameter Dj is 5000 times, and the running track of the grinding roller is consistent with the middle diameter of the grinding track of the grinding disc.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C15/00B02C23/00
Inventor 袁鸿飞张喜春张明昌戴永君迟振刚孟凡荣荣井涛杨柳赵家辉孙英臣戚世岩王立芳孙权徐春梅王赟翔安鹏杨喆
Owner CHANGCHUN POWER GENERATION EQUIP PLANT
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