A double-pipe quick connection and dust collection device for air casing drilling and its application

Abstract

The invention relates to a double-pipe fast connecting and dust collecting device for drilling of an air casting pipe and applications of the double-pipe fast connecting and dust collecting device. The double-pipe fast connecting and dust collecting device is used in the drilling technology of a single-power-head air casting pipe of soft outburst coal seams and mainly comprises a drill rod, a casting pipe, a dust hood, a bearing, packing, a sealing ring, a slag discharging port and the like, wherein symmetrical pin shafts are arranged on the side face of the outer part of the drill rod, and special slotted holes matched with the pin shafts on the drill rod are formed in the casting pipe. The device is matched with the operation of a drilling machine, so that the fast connection and separation of the drill rod and the casting pipe can be realized, and the operation convenience of the drilling machine is increased. The casting pipe is connected with the dust hood through the bearing, and packing seal are installed on two sides of the bearing. The sealing ring is arranged between the dust hood and the drill rod. The dust hoop is utilized to guide return slag from annular clearances of the drill rod and the casting pipe to be discharged out of the hole from the slag discharging port in the side face of the dust hoop, and the concentrated disposal of the return slag in the hole in the drilling process of the air casting pipe is realized. The coals dust pollution in the sit construction is eliminated, the construction environment is improved, and the construction safety is increased.

Description

technical field [0001] The invention belongs to the technical field of single power head air casing drilling in soft outburst coal seams, and in particular relates to a double-pipe quick connection and dust collecting device for air casing drilling and its application. Background technique [0002] The soft outburst coal seam has poor air permeability, high gas pressure, soft and broken coal seam, and serious injection holes and collapsed holes during the construction process, resulting in difficult drilling construction, low porosity, shallow hole depth, and even hidden safety hazards of coal and gas outbursts. At present, the drilling of soft outburst coal seam mainly includes dry auger drilling, medium wind pressure air drilling and other technologies, but none of them can solve the problem of drilling soft coal seam well. The medium-wind pressure air casing drilling technology has the characteristics of hole protection and drilling segmented drilling, which can effective...

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Problems solved by technology

[0003] At present, single power head air casing drilling is mostly used in the construction of broken ground formations on the ground. Since the drill pipe and casing are driven by one power head, when the drilling process is changed, it is necessary to simultaneously drill the drill pipe and casing and switch to the drill pipe. Drilling alone, at this time, there is no good solution to the problem of quick connection and detachment of the drill pipe and casing, which increases the difficulty of construction and affects the drilling efficiency

In addition, the slag return in the hole mostly adopts the open method, that is, the slag returned from the gap between the drill pipe and the casing annulus is directly returned to the outside of the hole, the slag returned in the hole is not concentrated, the pollution is large during the construction process, and the construction environment on site is not good

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