Anvil valve type hydraulic drive DTH hammer

Abstract

An anvil valve type hydraulic drive DTH hammer comprises an upper connector, an outer pipe, a spline sleeve and a lower connector which are sequentially connected. An anvil valve assembly is arrangedin the lower connector of a hollow structure and comprises a limiting cap, an anvil valve, an anvil valve spring and a guiding base. The limiting cap is fixed to the upper portion of the lower connector and provided with a conical hole, and the guiding base is fixed to the middle portion of the lower connector. The anvil valve is composed of an anvil valve head and an anvil valve rod, the anvil valve head is a cone matched with and attached to the conical hole, and the anvil valve rod is provided with a valve rod center hole. The side wall of the anvil valve rod is provided with a liquid passing groove hole communicating with the valve rod center hole, and the lower portion of the anvil valve rod is inserted in the guiding base and is in sliding fit with the guiding base. The anvil valve spring sleeves the anvil valve rod, and the two ends of the anvil valve spring press the anvil valve head and the guiding base correspondingly. By adoption of the anvil valve type hydraulic drive DTH hammer, the energy utilization rate and output ballistic work of the hydraulic drive DTH hammer can be effectively improved, the lower piston motion area sand accumulating dead angle can be reduced, rock cutting accumulated slag removal is facilitated, the service life of a motion seal pair is prolonged, and the jamming probability is reduced.

Description

technical field [0001] The invention relates to a construction device for geological drilling, in particular to an anvil valve type hydraulic down-the-hole hammer used in the fields of geological core drilling, scientific drilling, oil and gas exploration and the like. Background technique [0002] The hydraulic down-the-hole hammer is the impact load generating device in the hydraulic impact rotary drilling. The hydraulic down-the-hole hammer uses the energy in the flushing fluid supplied by the mud pump during the drilling process to directly drive the hammer in the hydraulic hammer to form an up and down The reciprocating motion continuously applies a certain frequency of impact load to the lower drilling tool, so as to realize the impact rotary drilling. Existing hydraulic down-the-hole hammers can be divided into positive-action hydraulic down-the-hole hammers, reverse-action hydraulic down-the-hole hammers, jet-type double-action hydraulic down-the-hole hammers, and je...

AI Technical Summary

Problems solved by technology

The above-mentioned hydraulic down-the-hole hammers all have a defect in the working process, that is, during the impact stroke, the pressure in the lower chamber increases due to the high-speed movement of the hammer, and when the hammer moves to the end of the stroke, it is more or less affected. The impact of pressure reduces the final velocity of impact and weakens the water cushion effect of impact energy

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