Self-rotating type pneumatic down-the-hole hammer

Abstract

The invention discloses a self-rotating type pneumatic down-the-hole hammer, and belongs to rock drilling tools. According to the pneumatic down-the-hole hammer, the drilling depth is not limited by a drill rod. The pneumatic down-the-hole hammer comprises a rotating device which drives the pneumatic down-the-hole hammer to rotate through a drill rod. The rotating device is composed of a supporting disc (1), a rotating connector (2) and a spiral pneumatic device (3) which are fixedly connected in sequence. The supporting disc (1) is composed of a supporting plate (1-3), an air inlet connector (1-1) and a lifting lug (1-2), and the rotary connector (2) is composed of an upper connector (2-1) fixedly connected with the supporting plate (1-3), a middle connector (2-2) fixedly connected with the upper connector and a lower connector (2-3) communicated with the middle connector in a rotating mode. The spiral pneumatic device (3) is composed of an air inlet pipe (3-1), a shell (3-3), an air outlet pipe (3-4) and a flow guide core body (3-2) welded in the shell through a spiral blade (3-5). The drill rod (4) is fixedly communicated with the air outlet pipe (3-4), and is fixedly communicated with the impactor (7).

Description

technical field [0001] The invention relates to a pneumatic down-the-hole hammer, in particular to a self-rotating pneumatic down-the-hole hammer, belonging to building foundation construction drilling tools. Background technique [0002] Pneumatic down-the-hole hammer is a drilling tool used to form pile holes in the construction of building foundations. It is usually composed of an impactor and an impact hammer that are slidably connected by splines. The working principle of its hole formation is to use the power head installed on the drilling rig to drive the pneumatic down-the-hole hammer to rotate through the drill pipe, and use the compressed air to push the piston in the impactor to force the impact hammer to make up and down reciprocating impact movements to achieve rock crushing; The cuttings are carried to the ground by the exhaust gas discharged by the down-the-hole hammer, so as to realize hole cleaning and slag discharge. [0003] At present, rigid connecting c...

AI Technical Summary

Problems solved by technology

[0004]1) The drilling depth is limited by the length of the drill pipe, which cannot meet the requirements of deep hole drilling;

[0005]2) If the drill pipe is too long, not only will there be a large swing, the drill pipe will easily rub against the wall of the pile hole, and it will also lead to a reduction in transmission efficiency;

[0006]3) If the drilling depth is too large, it will not only make it difficult to discharge slag, affect the drilling efficiency, but also easily aggravate the rapid wear of the impact hammer

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