Hydraulic in-the-hole hammer with dual nozzles and combined valve
A technology of hydraulic down-the-hole hammer and compound valve, which is applied to the drilling driving device, drilling equipment, earth-moving drilling and mining in the wellbore, etc. Effect
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[0009] The double-nozzle compound valve type hydraulic down-the-hole hammer includes a shell 1, an upper valve 2, a hammer 3, a hammer nozzle 4 and a lower joint 5. The upper center of the shell 1 is provided with an upper nozzle 6, which faces the upper valve 2 The upper valve upper cavity 7 and the central hole 9 can use the jet formed by the high-speed movement of the liquid flow to produce a low pressure effect at the position of the upper valve upper cavity 7; the outer diameter of the upper valve 2 forms a sliding fit with the inner diameter of the part of the housing 1, and the mating surface is open There is a longitudinal groove 8, the upper valve 2 can move up and down freely and is limited when moving down, the movement stroke is A, and the value of A is 1-500 mm. The upper section of the punch 3 forms a sliding fit with the housing 1, and the lower section forms a sliding fit with the inner hole of the upper section of the lower joint 5 to ensure that the punch 3 can m...
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