Wind pressure drilling device of pneumatic down-hole hammer

Abstract

The invention relates to a drilling device of a pneumatic down-hole hammer, in particular to a wind pressure drilling device of a pneumatic down-hole hammer for drilling between crushed rock layers and sand and gravel layers. The device is characterized in that a wear-resistant sleeve is sleeved outside a drilling pipe; connecting discs are arranged between the wear-resistant sleeve and the drilling pipe; connecting couplings are arranged at two ends of the wear-resistant sleeve; the connecting coupling at the lower end opening is connected with a tapered sealing section; a disc is fixedly connected between the middle of the wear-resistant sleeve and the drilling pipe and the connecting coupling at the upper end opening of the wear-resistant sleeve is connected with a sealing disc to form a composite drilling pipe which improves the wind speed in the borehole; or the connecting discs are respectively arranged among the upper part and the lower part of the wear-resistant sleeve and the drilling pipe to serve as the fixed brackets of the wear-resistant sleeve to form a powder spooning pipe. By accelerating the wind speed in the borehole and additionally arranging the powder spooning pipe, the device of the invention can timely remove the rock powder, rock debris and gravel in the borehole and greatly improve the drilling efficiency.

Description

technical field [0001] The invention relates to a pneumatic down-the-hole hammer drilling device, in particular to a pneumatic down-the-hole hammer pneumatic drilling device for drilling in gravel layers and sand pebble layers. Background technique [0002] At present, in the drilling method of pneumatic down-the-hole hammer, especially Π-130 pneumatic down-the-hole hammer (drilling tool diameter 110mm, drilling diameter 130mm), air compressors are generally used as driving equipment. The wind pressure is a fixed value. With the increase of the drilling depth, the rock powder, cuttings and gravel produced by the DTH hammer cannot be discharged from the hole in time, and are suspended in the hole. When the wind supply is stopped, a large amount of rock powder and cuttings will And gravel accumulates at the bottom of the borehole, burying the drilling tool, and it is impossible to increase the drill pipe to continue drilling, especially when encountering a sandy pebble layer a...

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Problems solved by technology

[0002] At present, in the drilling method of pneumatic down-the-hole hammer, especially Π-130 pneumatic down-the-hole hammer (drilling tool diameter 110mm, drilling diameter 130mm), air compressors are generally used as driving equipment. The wind pressure is a fixed value. With the increase of the drilling depth, the rock powder, cuttings and gravel produced by the DTH hammer cannot be discharged from the hole in time, and are suspended in the hole. When the wind supply is stopped, a large amount of rock powder and cuttings will And gravel accumulates at the bottom of the drilling hole, burying the drilling tool, and it is impossible to increase the drill pipe to continue drilling, especially when encountering sandy pebble layer and gravel layer, this situation is more serious, and the drilling efficiency is greatly reduced

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