A kind of hydraulic hole reaming drilling tool and its reaming method for mechanically cavitating coal seam

Abstract

The invention discloses a hydraulic expanding drill used for mechanical hole making coal bed permeability improvement and an expanding method of the hydraulic expanding drill. An expanding tool can berotationally installed on the front side of a hollow cylinder shaft, with the transverse center line of the hollow cylinder shaft as the boundary, an arc clamping tooth is arranged on one side of theouter wall of the rear end of the expanding tool, a clamping groove is formed in the other side of the outer wall of the rear end of the expanding tool, and the top end of a clamping head penetratesa clamping device to be matched with the clamping groove. A hydraulic cylinder and a gas-water channel I for compressed air and high-pressure water flow to pass are arranged in a pipeline at the rearportion of a drill body, and a gear arranged on the hydraulic cylinder is engaged with the arc tooth. One end of a gas-water branch channel III communicates with the gas-water channel I, and the otherend of the gas-water branch channel III communicates with the bottom end of the clamping device. Due to the engagement of the gear and the arc clamping tooth, the hydraulic cylinders works, the gearrotates, the arc clamping tooth is driven to rotate, and the expanding tool is opened with an angle. The hydraulic expanding drill used for mechanical hole making coal bed permeability improvement andthe expanding method of the hydraulic expanding drill are simple in structure and convenient to operate and capable of adapting to the requirements for different expanding diameters, in addition, thelength of the expanding tool does not need to be changed, the expanding efficiency is improved, and the work cycle is shortened while the workload is reduced.

Description

technical field [0001] The invention relates to a reaming drilling tool, in particular to a hydraulic reaming drilling tool for mechanical hole-making coal seam anti-reflection and a reaming method thereof, belonging to the technical field of coal mine gas drainage. Background technique [0002] my country's coal mining industry has a long history, and the coal mining industry has also brought a large amount of coal resources, and coal resources are non-renewable resources. With the development and utilization of coal, my country's coal resource reserves have been greatly reduced. With the increase of coal resources The coal mining has been gradually extended to the deep, and the geological structure of deep coal seams has become more complex, and the gas content and gas pressure in coal seams have increased significantly, which has brought about frequent occurrence of safety accidents. For this reason, the primary task of mining has become gas drainage, but most of the coal ...

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Problems solved by technology

For this reason, the primary task of mining has become gas drainage. However, most of my country's coal resources are low-permeability coal seams, which greatly increases the time of gas drainage and reduces the efficiency of gas extraction, thus affecting the succession of mine production.

[0003] For a single high-gas and low-permeability coal seam that does not have the conditions for mining protective seams, in order to effectively solve the problem of gas drainage in low-permeability coal seams, it is necessary to increase the permeability of the coal seam by means of pressure relief and permeability enhancement within the seam. The gas drainage method of mechanical drilling can expand the inner surface area of ​​the drainage hole, thereby increasing the air permeability of the coal seam, but it has brought about problems such as low hole expansion efficiency, large workload and long working cycle.

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