Core valve energy storing type hydraulic down-the-hole hammer

Abstract

The invention discloses a core valve energy storing type hydraulic down-the-hole hammer. The lower portion of an outer shell (1) is in rigid connection with a lower connector (6), an upper hammer body and a lower hammer body in the outer shell (1) are in rigid connection, the upper segment and the middle segment of the upper hammer body are sleeved with hammer springs (2), a core valve (4) and a valve spring (5) are assembled in an inner cavity in the lower hammer body, the valve spring is arranged between an annular large head (9) of the top of the core valve and a step (11) of an inner cavity in the lower hammer body, the lower connector (6) is divided into an upper segment and a lower segment, the upper segment is in a cylinder shape, the bottom of the cylinder is a hammering face, a liquid draining hole (14) is formed in the center of the lower segment, the lower segment is communicated with a bottom cavity with an inner thread through the liquid draining hole, and the lower hammer body, the core valve, the valve spring and the hammering face of the lower connector form a core valve type valve control mechanism, wherein the core valve, the valve spring and the lower connector are installed in the lower hammer body. The core valve energy storing type hydraulic down-the-hole hammer can overcome defects in a valve control mechanism in the prior art, and the valve control mechanism of the energy storing type hydraulic down-the-hole hammer is not interfered by the hammer lifting process.

Description

technical field [0001] The invention relates to the field of drilling machinery, in particular to a core-valve energy-storage hydraulic down-the-hole hammer mainly used in the percussion rotary drilling technology of rock core drilling, water wells, oil drilling and mine drilling engineering. Background technique [0002] Hydraulic down-the-hole hammer has multiple action principles such as positive action, reverse action, double action and compound action. The energy-storage hydraulic down-the-hole hammer is a reaction type, for example: the energy-storage hydraulic down-the-hole hammer with the patent number ZL200910094971.6. [0003] The energy-storage hydraulic down-the-hole hammer has the advantages of simple structure, high energy utilization rate, small required working medium flow rate, reduced working hydraulic pressure, relatively large impact energy, adjustable frequency, flow rate from small to large within the rated working flow range, and working hydraulic press...

AI Technical Summary

Problems solved by technology

However, because the sleeve valve in the valve control mechanism also has the function of the cylinder liner when the piston is hydraulically lifted, it is a composite function valve control mechanism, so the function of the valve is vulnerable to the inferior quality of solid particles in the process of lifting the hammer. The interference of the working fluid or the over-tight seal makes the hammer work unstable. The impact is stopped halfway and the valve is closed but not completely closed after the impact is stopped. The drainage resistance increases significantly, and the working fluid flows from the valve. The speed of spraying from the gap between the valve seat and the valve seat is dozens of times the normal liquid discharge speed, and the high-speed sprayed working medium containing mud and sand will quickly erode the closed surface between the valve and the valve seat, resulting in the loss of valve function and other failures; the above problems It restricts the application range of the energy storage hydraulic DTH hammer; the key to solving the above problems is to develop a valve control mechanism that is completely free from the interference of the hammer lifting process.

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