Pre-fixing abrasive and water jet united cutting tooth type roller of coal mining machine

Abstract

A pre-fixing abrasive and water jet united cutting tooth type roller of a coal mining machine comprises a cutting shaft, a barrel, a high-pressure hose, cutting teeth, a spray head assembly and a core sleeve. The barrel sleeves the periphery of the core sleeve, and the cutting shaft sleeves a matched inner cavity in the core sleeve to drive a cutting head to move. The two ends of the high-pressure hose are in threaded connection with the core sleeve and the barrel respectively. A nozzle base flow channel, a sleeve and a nozzle are arranged in the spray head assembly. The cutting shaft is provided with a water inlet hole, a main flow channel and a water outlet hole. One end of the water inlet hole is connected with a high-pressure water source, the other end of the water inlet hole is communicated with the main flow channel, one end of the water outlet hole is connected with the main flow channel, the other end of the water outlet hole is communicated with a core sleeve flow channel, and the barrel is provided with a barrel flow channel. A mixture of water and abrasive enters the main flow channel through the water inlet hole, passes through the core sleeve flow channel through the water outlet hole, flows into the barrel flow channel through the high-pressure hose, then flows into the spray head assembly, successively passes through the nozzle base flow channel and the sleeve in the spray head assembly to enter the nozzle, and forms a high-pressure abrasive and water jet. The efficiency of mining a thin coal seam can be effectively improved, and cutter wear is reduced.

Description

technical field [0001] The invention relates to a front-mixed abrasive water jet combined with a pick-type shearer drum, which is especially suitable for mining thin coal seams containing gangue. Background technique [0002] At present, the mining of thin coal seams in my country mainly uses the drum shearer, which relies on the action of the picks installed on the drum and the coal wall for coal mining. However, it is difficult to overcome the contradiction of "small body and high power" in a small space. In the thin coal seam containing gangue, the mining efficiency will be greatly reduced, and the picks on the drum are easy to be worn, and the service life is shortened. The existing water jet assisted cutting head rock breaking technology uses pure water jet, which has weak cutting ability and has no obvious effect on the mining of thin coal seams containing gangue, and can only meet the work requirements of spraying and dust reduction. [0003] The pre-mixed abrasive wa...

AI Technical Summary

Problems solved by technology

[0002] At present, the mining of thin coal seams in my country mainly uses the drum shearer, which relies on the action of the picks installed on the drum and the coal wall for coal mining. However, it is difficult to overcome the contradiction of "small body and high power" in a small space. In the thin coal seam containing gangue, the mining efficiency will be greatly reduced, and the picks on the drum are easy to be worn, and the service life is shortened

The existing water jet assisted cutting head rock breaking technology adopts pure water jet, the cutting ability of pure water jet is weak, and the mining effect for thin coal seam containing gangue is not obvious, and it can only meet the working requirements of spray dust reduction

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