Reverse-circulation pneumatic impact down-the-hole hammer

Abstract

The invention relates to an impact down-the-hole hammer, in particular to a reverse-circulation pneumatic impact down-the-hole hammer. The reverse-circulation pneumatic impact down-the-hole hammer isconstituted by an upper joint, a shell, a spline sleeve, a drill bit, a punch hammer and an air cylinder; the upper joint is mounted at one end of the shell in a threaded mode, the spline sleeve is mounted at the other end of the shell in a threaded mode, and the drill bit is slidably mounted in the spline sleeve through a key groove; and a core pipe is mounted in the shell, a check valve is mounted on the circumference of one end of the core pipe through a spring, the punch hammer is movably mounted on the circumference of the other end of the core pipe through the air cylinder, the punch hammer and the drill bit are connected in an intermittent contact mode, and a flow guiding joint is arranged between the air cylinder and the upper joint. According to the reverse-circulation pneumatic impact down-the-hole hammer, kinetic energy of high-pressure air can be converted into periodic axial impact acting force through the punch hammer, and thus the rock-breaking drilling speed is increased; and the rock core is returned upwards to the ground through a center channel of the core pipe, the purity of the rock core is improved, and pollution to the surrounding environment is reduced.

Description

technical field [0001] The invention relates to an impact down-the-hole hammer, in particular to a reverse-circulation pneumatic impact down-the-hole hammer. Background technique [0002] In the process of my country's current economic construction, the reverse circulation impact DTH hammer plays an increasingly important role in geotechnical drilling engineering. It is widely used in water supply, mining, municipal, environment, transportation and construction. Greatly improve drilling efficiency, reduce construction costs, and ensure project quality. Its economic benefits are very significant, and it has been highly valued by the drilling industry at home and abroad. Hammer works, using the reciprocating impact of the impactor on the drill bit to achieve the purpose of breaking the rock, and the broken rock is carried to the ground with the exhaust gas discharged after the DTH hammer works, so as to achieve the purpose of hole cleaning and slag discharge. However, due to The...

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Problems solved by technology

[0002] In the process of my country's current economic construction, the reverse circulation impact DTH hammer plays an increasingly important role in geotechnical drilling engineering. It is widely used in water supply, mining, municipal, environment, transportation and construction. Greatly improve drilling efficiency, reduce construction costs, and ensure project quality. Its economic benefits are very significant, and it has been highly valued by the drilling industry at home and abroad. Hammer works, using the reciprocating impact of the impactor on the drill bit to achieve the purpose of breaking the rock, and the broken rock is carried to the ground with the exhaust gas discharged after the DTH hammer works, so as to achieve the purpose of hole cleaning and slag discharge. However, due to There are certain deficiencies in the design of the existing reverse circulation impact DTH hammer, resulting in a lack of rock-breaking drilling speed, and when the air compressor stops working, the internal pressure of the system decreases, and formation water and cuttings may enter the air pressure. The reversing system will affect the reliability of its work, even damage parts, shorten the service life of tools, etc. Therefore, it is necessary to improve it

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