Down-the-hole drilling

Abstract

The invention discloses a down-the-hole drill, which comprises a rack, a drilling frame, a rotary air supply mechanism and a drilling tool, wherein a walking chassis, a hydraulic system, an air supply system and a drilling arm are mounted on the rack; the drilling tool comprises a main drill rod, a drill bit and an impactor; a first check valve is arranged in the upper end of the main drill rod; a stamping hammer is arranged in the impactor; the air supply system comprises an air compressor; a sleeve is mounted at the lower end of the drilling frame; a whistle head is arranged at the lower end of the sleeve; a second check valve is arranged in the middle of the main drill rod; an air duct is arranged on the air compressor; the walking chassis is a wheel walking chassis; the wheel walking chassis comprises front wheels mounted at the front end of the rack and rear wheels mounted at the rear end of the rack; and a walking frame deflection oil cylinder is arranged between the rack and the wheel walking chassis. The down-the-hole drill has the benefits as follows: the drill is unlikely to get stuck and the main drill rod and the impactor are unlikely to block, walking moving is convenient, the oil consumption is less, direct construction is achieved, construction auxiliary conditions are not required, construction time is shortened, the construction cost is reduced, the working efficiency is high, the maintenance cost is low and the service life is long.

Description

technical field [0001] The invention relates to a drilling device, in particular to a down-the-hole drill suitable for channel drilling. Background technique [0002] Down-the-hole drilling is equipment used to drill holes in rocks (load explosives in drilled holes) before engineering blasting. The down-the-hole drills sold in the market can only be used on the exposed rock surface on land to drill rock holes. If the construction is carried out on the river course, some conditions must be met: a large amount of earthwork needs to be used to form a cofferdam, and the construction area and the middle of the river course must be met. To isolate the water, a large number of excavating machines are used to clean up the silt, river sand, gravel, etc. in the river, and the underground rocks can be exposed before construction can be carried out. Simple roads need to be built to transport the equipment to the construction site, and several large pumping equipment are required. 24-ho...

AI Technical Summary

Problems solved by technology

The down-the-hole drills sold in the market can only be used on the exposed rock surface on land to drill rock holes. If the construction is carried out on the river course, some conditions must be met: a large amount of earthwork needs to be used to form a cofferdam, and the construction area and the middle of the river course must be met. To isolate the water, a large number of excavating machines are used to clean up the silt, river sand, gravel, etc. in the river, and the underground rocks can be exposed before construction can be carried out. Simple roads need to be built to transport the equipment to the construction site, and several large pumping equipment are required. 24-hour operation greatly increases the cost and time of down-the-hole drilling in river channel construction; when drilling in river channels, when the drilling depth reaches three meters, it is necessary to add more drill pipes, and the wind pressure needs to be suspended during the connection process. Suspension will lead to excessive ground water pressure, and the mud at the bottom of the drill hole will be poured into the impactor above the drill bit under the action of water pressure, causing the impactor to be blocked and unable to ventilate. The drill bit is stuck in the silt and cannot be pulled out, and the existing down-the-hole drills all adopt a simple crawler structure. In the construction area with deep silt, the central groove of the crawler is often involved in some stones and stones in the river. The walking gear is stuck, so that the drilling machine cannot walk, and it must be hoisted out of the car trap area with lifting equipment. This simple crawler-type submersible drill cannot be used for construction in areas with deep water levels. If large-scale crawler-type walking is used, The fuel consumption is large, which increases the construction cost; in addition, there is no sleeve on the existing down-the-hole drilling drill frame, only two iron frames support it, and after it is driven into the sandy rock layer, the stone is easy to get stuck on the drill bit and Can't go on, waste time and affect construction progress

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