Powerful extension bar

Abstract

The application provides a powerful extension bar, comprising a body, a water diversion member, a fixed part, an elastic flexible pipe, a first control part and a movable part. End parts of two ends of the body are provided with a first connection part and a water injection hole communicated with a water inlet hole. The fixed part is fixed on the side wall of the body close to one end of the firstconnection part. The movable part is slidably mounted on the side wall of the body close to one end of a second connection part. The elastic flexible pipe is mounted on the fixed part and the movablepart. A cavity is formed between the elastic flexible pipe and the body. A polishing layer is arranged on the side wall of the elastic flexible pipe away from one side of the body. A first control part is used for controlling a water flow to flow from the water injection hole. The elastic flexible pipe of the present application can accumulate water to expand, thereby achieving sealing of the coal seam drilling; the water diversion member and the first control member simultaneously satisfy the requirements of coal seam water injection and sealing; the polishing layer is used to enable the powerful extension bar to have the function of polishing a coal seam sealing hole.

Description

technical field [0001] The application relates to the technical field of coal mine safety production, in particular to a strong connecting rod. Background technique [0002] In the process of coal mining, the coal seam structure becomes loose by injecting water into the coal seam to be mined, which is beneficial to mining and increasing the water content of the coal seam, and achieves the purpose of reducing dust and improving coal quality. At present, the coal seam water injection work needs to use the sealing device to seal the borehole. The sealing performance is the key to the success of the above work. The sealing device is suitable for the working face with thick coal seam and large gas, and the density of the drill hole is determined according to the thickness of the coal seam. and depth, coal seam water injection should be carried out in advance and mined 3 to 5 days after water injection, but the existing water injection equipment is prone to explosion during operat...

AI Technical Summary

Problems solved by technology

At present, the coal seam water injection work needs to use the sealing device to seal the borehole. The sealing performance is the key to the success of the above work. The sealing device is suitable for the working face with thick coal seam and large gas, and the density of the drill hole is determined according to the thickness of the coal seam. and depth, coal seam water injection should be carried out in advance and mined 3 to 5 days after water injection, but the existing water injection equipment is prone to explosion during operation, poor safety, less repeated use times and frequent replacement, and the use and removal process of the sealing device is cumbersome At the same time, during the drilling construction process, due to the rocking of the drill pipe, soft coal quality and stress concentration around the drilling, the wall of the coal seam drilling is often rough, which will also affect the sealing effect of the sealing device on the drilling

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