A Gradient Rolling Type HP Type Coal Mill

Abstract

The invention relates to a gradual rolling HP type coal mill, in which a wear-resistant alloy is surfacing on the outer surface of the roller sleeve to form a roller-tired grinding roller with a semicircular arc-shaped cross section, and the The inner surface of the liner is surfacing welded with wear-resistant alloy to form an arc-shaped structure that is concave inward and adapts to the shape of the tire-type grinding roller. The outer surface of the liner is connected to the grinding bowl through a flat key. , the small end of the liner is pressed by the bowl clamping ring and the bowl hub, and the bowl extension retaining ring is fixedly installed on the large end of the liner and on the bowl hub, and the bowl extension retainer A gap is provided between the inner wall of the ring and the large end of the liner. This scheme can avoid discharging hard coal as coal gangue, which also reduces the discharge of coal gangue and improves the working efficiency of coal grinding.

Description

technical field [0001] The invention relates to the technical field of HP-type coal pulverizers, in particular to a gradual rolling type HP-type coal pulverizer. Background technique [0002] In the known technical field, coal mills are divided into vertical pulverizers, high-pressure suspension roller mills, medium-speed micro-powder mills, overpressure trapezoidal mills, and Raymond mills. Coal mills are used to crush coal blocks and grind them into coal It is an important auxiliary equipment for pulverized coal furnace. The coal grinding process is a process in which coal is broken and its surface area is continuously increased. To increase the new surface area, the binding force between solid molecules must be overcome, so energy is consumed. Coal is ground into coal powder in the coal mill, mainly through crushing, smashing and grinding, among which the crushing process consumes the least energy, and the grinding process consumes the most energy. All kinds of coal mil...

AI Technical Summary

Problems solved by technology

When grinding coal, it forms a working form of linear grinding, which is easy to grind for general high-quality bituminous coal; when encountering hard raw coal, when the coal mill is working, HP can be seen from the force of the vertical section. The contact of the grinding part of the mill is linear, the grinding pressure is evenly distributed, the grinding roller is prone to slipping, and the raw coal cannot be fully ground

Therefore, the harder raw coal is thrown to the pebble coal discharge area by the centrifugal force of the grinding bowl and is discharged by the coal mill. This is the main reason why the raw coal in the pebble coal will increase, so that some performance parameters cannot meet the design requirements.

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