Bedding drilling hydraulic slotting coal cinder migration simulation system and test method

Abstract

The invention relates to a bedding drilling hydraulic slotting coal cinder migration simulation system and a test method, and belongs to the field of coal mine underground extraction. The device comprises a water supply system, a slotting and deslagging simulation system, a rotating device, a drilling simulation table and a monitoring system. And the water supply system is connected with the slotting and deslagging simulation system through a water supply pipe. Coal slag discharged by the slotting slag discharge simulation system is mixed with water flow in the water supply pipe through the slag discharge pipe and then enters the transparent drill hole together. A stepping motor in the rotating device is connected with the drill rod through a speed adjusting device. Data are collected through a high-speed camera and a speed sensor, then the coal cinder migration rule in a drill hole is analyzed, and the state that coal cinder flows to an outlet is observed through a high-speed camera placed at the outlet of the drill hole. The system can be used for testing coal cinder migration characteristics under different drilling angles, water supply flows, drill rod rotating speeds, drill rod spiral depths, coal cinder particle sizes and slotting slag discharge quantities.

Description

technical field [0001] The invention belongs to the field of underground mining in coal mines, and relates to a simulation system and a test method for the migration of coal slag by hydraulic slitting of drilled holes along the bed. Background technique [0002] In recent years, as coal mining gradually enters the deep part, the problems of gas drainage in high in-situ stress, high gas and low permeability coal seams have gradually become prominent. Emerging technical means are increasingly used in pressure relief and permeability enhancement of low permeability coal seams, and have achieved good results. However, at present, the biggest problem faced in the process of hydraulic cutting of bedding drilling is the problem of slag discharge. Due to the large amount of coal slag during the cutting process, and a large amount of coal will fall off in a short period of time, resulting in the process of cutting the seam. Problems such as hole plugging, spray hole, holding drillin...

AI Technical Summary

Problems solved by technology

But at present, in the process of bedding drilling hydraulic cutting, the biggest problem faced is the problem of slag discharge. Due to the large amount of coal slag during the cutting process, and a large amount of coal will fall of

Images