Grinding disk assembly of medium speed coal mill

Abstract

The invention provides a grinding disk assembly of a medium speed coal mill. The integral grinding disk comprises the medium speed coal mill, and a grinding disk installed on the medium speed coal mill; the grinding disk is of an integral structure cast overall, and the grinding disk is provided with a mounting groove for installing a grinding disk tile; the grinding disk tile is installed in themounting groove of the grinding disk, and fixedly connected by two pins, and the middle part of the grinding disk tile is provided with a clamping ring; the clamping ring and the grinding disk are cast separately, and the clamping ring is fixedly connected with the grinding disk by a holddown bolt; and the side wall of the grinding disk is provided with at least two scraper mechanisms used for discharging pebble coal and other materials in raw coal into a slag discharge box. The grinding disk assembly has the advantages that higher grinding pressure of the coal mill can be born, and meanwhilethe overall structure of the grinding disk is simplified; the working procedures for installing parts of the grinding disk are omitted, and meanwhile the casting and machining workload of the grindingdisk is reduced; and the manufacturing cost of equipment is reduced.

Description

technical field [0001] The invention belongs to the technical field of pulverizing and crushing equipment, and in particular relates to a grinding disc assembly of a medium-speed coal pulverizer. Background technique [0002] The medium-speed coal mill is mainly used in the positive pressure direct blowing pulverization system of thermal power plants. It is used to grind raw coal into coal powder with a certain fineness requirement, and at the same time complete the drying process of coal powder and transport the coal powder to the boiler furnace for combustion. When the coal mill is running, the grinding disc assembly is driven by the main motor to rotate the reducer. Under the action of friction, the raw coal on the grinding disc tile drives the grinding roller assembly to rotate, and the loading pressure of the coal mill is transmitted through the hydraulic oil station and the pull rod mechanism. To the loading frame and grinding roller, so as to realize the grinding of ...

AI Technical Summary

Problems solved by technology

[0003] The grinding disc in the old-fashioned grinding disc assembly is cast in a split structure, which is divided into upper and lower parts, which are only connected and fixed by three pins and bolts. The bearing pressure of the grinding disc is low, and there may be a possibility of screw breakage during use. In the installation process, the installation difficulty and construction time of the split grinding disc are increased; the use of a pin shaft for fixing the grinding disc tile cannot solve the problem that the cumulative installation tolerance of the grinding disc tile due to manufacturing errors is relatively large. Large phenomenon, so that the final installation of the disc tiles will have a large gap; the Chinese invention patent with the publication number CN 109718899 A discloses a coal mill grinding disc, and the Chinese invention patent with the publication number CN 103769274 A discloses a A kind of coal mill, its grinding disc is all divided into upper grinding disc and lower grinding disc, just there is above-mentioned technical problem

[0004] In addition, since there is no groove at the bottom of the grinding disc, when rainwater or water enters the coal mill at the installation site, the water inside the grinding disc cannot be discharged

The old-fashioned grinding disc pressing ring and the grinding disc are an integral structure. The grinding disc is in a U-shaped circumferential shape, which not only increases the difficulty of casting, but also easily causes casting defects on the grinding disc, and also increases the difficulty of machining; the old-fashioned scraper mechanism will Due to the occurrence of objects with high hardness such as large iron blocks and bolts in the pebble coal, the rigid contact between the object and the lower frame will cause the scraper mechanism to be stuck or severely deformed. On the spot, it is necessary to stop the grinding and check or replace the entire set of scrapers. This increases the difficulty of equipment maintenance and prolongs the construction time for equipment maintenance, resulting in frequent downtime of the coal mill for maintenance, which affects the safe and stable operation of the unit; because the angle of the cone in the cover plate is small, only 30°, the raw coal falls on the cover The plane time of the plate is extended, which delays the time for the raw coal to enter the grinding area of ​​the coal mill and reduces the working efficiency of the coal mill

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