Quick adjustment technology for gaps between grinding rollers of coal mill and liner plate of grinding bowl

Abstract

The invention discloses a quick adjustment technology for gaps between grinding rollers of a coal mill and a liner plate of a grinding bowl, and belongs to the technical field of maintenance technologies of coal mills. The quick adjustment technology is used for quickly adjusting the gaps between the grinding rollers and the liner plate of the grinding bowl. According to the quick adjustment technology, the gaps between the grinding rollers of the bowl type coal mill and the liner plate of the grinding bowl are limited through asbestos boards, the grinding rollers go down slowly till the grinding rollers make contact with the asbestos boards and the asbestos boards slightly resist pulling, then, the gaps between the grinding rollers and the liner plate of the grinding bowl are limited within the needed gaps, and therefore, the gaps between the grinding rollers and the liner plate of the grinding bowl are quickly adjusted. The quick adjustment technology for the gaps between the grinding rollers of the coal mill and the liner plate of the grinding bowl is innovative in the industry; the process is simplified, and the adjustment process is completed in one step; the tedious measurement and adjustment process is avoided; maintenance time is shortened, and the labor efficiency of maintainers is improved; the continuous workability of a coal pulverizing system is improved, and it is guaranteed that the whole production process is smooth; and the quick adjustment technology provides guarantees for high-efficiency production of enterprises, has remarkable economic benefits and has great application and popularization value.

Description

technical field [0001] The invention relates to a process for quickly adjusting the gap between a grinding roller and a grinding bowl lining plate of an HP bowl-type coal mill, and belongs to the technical field of coal mill maintenance technology. Background technique [0002] The coal mill is the core equipment of the pulverizing system, which grinds the raw coal into the required coal powder according to the process requirements. After a period of operation, the liner is worn, and the gap between the grinding roller and the bowl liner increases, and a part of the large particle coal falls into the pebble coal chamber along the wind ring, and is sent into the pebble coal hopper by the scraper at the bottom of the mill bowl After being discharged, a part is lifted up by the hot air and then collides with the gas deflector installed on the coal mill body, and the coarser coal powder is reflected back to the grinding disc to continue grinding, which will inevitably cause a dr...

AI Technical Summary

Problems solved by technology

After a period of operation, the liner is worn, and the gap between the grinding roller and the bowl liner increases, and a part of the large particle coal falls into the pebble coal chamber along the wind ring, and is sent into the pebble coal hopper by the scraper at the bottom of the mill bowl After being discharged, part of it is lifted up by the hot air and collides with the gas deflector installed on the coal mill body, and the coarser coal powder is reflected back to the grinding table to continue grinding, which will inevitably lead to a decline in the pulverized coal grinding efficiency

To adjust the gap between the grinding roller and the grinding bowl liner of the current HP bowl coal mill, it is necessary to close the entire pulverizing system first. Loosen the nuts on the bolts of the roller limit tie rods gradually, so that the grinding roller rests on the grinding bowl liner, and then screw in three limit nuts, so that the grinding rollers are gradually raised by 12mm, and then the maintenance personnel withdraw from the mill Coal machine, close the maintenance manhole, start the grinding bowl, slowly loosen the limit nut, and gradually lower the grinding roller until the grinding roller sleeve and the grinding bowl liner just rub against each other continuously, and then turn the limit nut clockwise for one and a half planes. 135°, at this time, the gap between the grinding rollers and the bowl lining is about 3mm, the whole adjustment process of the three grinding rollers takes 9 hours, the adjustment process is relatively cumbersome, and needs to be adjusted 5 to 6 times a year, not only for the milling system Continuous work has a certain impact, and the entire production process needs to be readjusted, causing instability for safe production. At the same time, the lack of pulverized coal increases the cost of other fuels, which adversely affects the economic benefits of the enterprise

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