High-efficiency helical water-through jackrod
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HEBEI JIKAI IND GRP
- Publication Date
- 2008-10-29
- Estimated Expiration
- Not applicable · inactive patent
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Abstract
Description
technical field
[0001] The invention relates to a tool for drilling holes in coal seams, in particular to a high-efficiency helical water-through drilling rod. Background technique
[0002] In the process of coal mine production, in order to prevent coal and gas outburst accidents, it is necessary to drill release holes in the coal seam before tunneling to release the gas in the coal seam to eliminate the stress of the coal seam. The drill pipes used for drilling in existing coal mines are common auger drill pipes. The common auger drill pipes have several drill pipe units that are connected as a whole through insertion and positioning. Each drill pipe unit has a drill pipe core, a spiral body, a square rod, A retaining ring fixed on the square bar, a horizontal pin matched with the retaining ring, and a helical spring (spring body) for limiting support of the horizontal pin. Even if it is changed to a water-passing drill pipe in the form of a helical spring limited to the ...