Coal Mine Gas Drainage System and Method for Increasing Gas Drainage Concentration by Variable-diameter Reaming

Abstract

The invention discloses a coal mine gas drainage system and method for increasing the concentration of gas drainage with variable diameter expansion. The system includes a coal mine drilling machine, a drilling bit, a hole sealing mechanism, a grouting pipeline system, and a gas drainage pipeline system And the reaming bit, the reaming bit includes a power transmission mechanism and three drill blades, the power transmission mechanism includes a sun gear, three planetary gears, and on the sun gear shaft and the planetary gear shaft, the three drill blades are respectively connected to the three The planetary gear is fixedly connected, and the bit blade is connected with a pick through the tooth base; a hydraulic cylinder and a push rod are arranged inside the sun gear shaft, a spiral chute is arranged on the ejector rod, and a slider is arranged on the inner wall of the sun gear shaft; The method comprises steps: 1. drilling; 2. expanding the hole; 3. washing the hole; 4. grouting and sealing the hole; 5. gas drainage. The invention has novel and reasonable design, high strength of the reaming bit, simple reaming process, can improve the sealing quality and gas extraction concentration, is practical and effective, and is easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of coal mine gas drainage, and in particular relates to a coal mine gas drainage system and method for increasing the concentration of gas drainage by variable diameter and reaming. Background technique [0002] In recent years, gas disasters have become one of the important factors threatening mine safety production. The fundamental measure to solve mine gas accidents is to reduce the gas content in the coal seam, thereby reducing its danger. Gas pre-extraction is the most fundamental and effective measure at present, and it has been widely used in outburst mines at home and abroad. However, the gas extraction concentration in most coal mines in my country is low, and the extraction effect is generally poor. According to statistics, about 65% of bedding boreholes have a gas drainage concentration lower than 30%. The reason for the generally low gas drainage concentration is mainly the limitation of hole se...

AI Technical Summary

Problems solved by technology

The sealing quality of this method is relatively good when it is applied to drilling through layers, descending drilling, and drilling with a certain inclination angle. It is easy to form a "crescent"-shaped air leakage channel, which leads to serious air leakage in gas extraction

Since the drilling plugging is a one-time operation, the material cannot be taken out for secondary use, and the failure of the sealing means that the drilling cannot be reused

For coal mining enterprises, not only did not achieve a good governance effect, but also a large amount of engineering waste

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