Middle-low air pressure down-hole hammer

Abstract

Provided is a middle-low air pressure down-hole hammer. The middle-low air pressure down-hole hammer comprises a back joint, a check valve, an air-distribution rod, a piston, an internal cylinder, an outer casing pipe, a clamping ring, a guide sleeve, a plug, a first spring, a rubber stick, a lateral pin, a pin-hanging type drill and a pin-hanging type front joint. The check valve is a one-way valve and provided with a valve seat and a second spring. The piston is a long-and-thin-shaped piston with a hole path. The air-distribution rod and an air inlet seat at the back end of the check valve are of an integrated structure. The internal cylinder is placed outside the air-distribution rod and the piston. In the process of piston motion, the matched end of the piston and the air-distribution rod is in the internal cylinder all the time, a cavity is formed between part of the piston and the outer casing pipe, and other parts of the piston are matched with the internal cylinder. According to the middle-low air pressure down-hole hammer, the air distribution rod and the valve seat of the check valve are integrated, the structure is simple, the functions of locating, vibration damping and air suction can be achieved, and stability and reliability are achieved in the process of work. Contact portions of the piston and the internal cylinder are reduced, and therefore the internal cylinder is wear-resisting, and working pressure ranges of the hammer are wide.

Description

technical field [0001] The invention relates to a pneumatic impact device, in particular to a pin-type down-the-hole impactor with medium and low wind pressure. Background technique [0002] The down-the-hole hammer is a typical pneumatic impact device. It is the drilling tool of the down-the-hole drilling rig and the working mechanism of the drilling rig for drilling. This equipment is mainly used for drilling blast holes with a diameter of 65-305mm and a hole depth of 60m. Among them, the drilling operations with a hole diameter of about 65-105mm are generally completed by medium and low pressure down-the-hole drilling tools. [0003] At present, the low-wind pressure down-the-hole impactors used in the market are characterized by a valve plate inside. Through the reversing of the valve plate, the compressed air can alternately enter the front and rear air chambers of the impactor to complete the air distribution action, and finally make the piston travel. into a recipro...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned non-valve double-cylinder submersible impactor has the following disadvantages: 1. There is a rubber ring between the valve seat and the rear joint, which can absorb a certain amount of energy by itself when the impactor is working. After a period of time, the aging and deformation of the rubber will cause vibration and seriously affect the matching accuracy of the various components, thereby reducing the work efficiency and shortening the working life of the impactor

2. The thin and long structure of the inner cylinder makes the processing more complicated and the production cost is high; and both ends of the inner cylinder are always under stress

3. The piston always reciprocates in the inner cylinder, which increases the wear of the inner cylinder

4. There are more intake and exhaust passages, resulting in greater air pressure loss

5. The failure rate of the built-in valve is high

6. Since the inner cylinder is a thin-walled long piece and is affected by force, its applicable wind pressure range is small (0.5-1.2MPa)

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