Valveless single cylinder blind hole channel down-hole hammer

Abstract

A valveless single cylinder blind hole channel down-hole hammer comprises a cylinder block. The upper end of the cylinder block is connected with a rear connector. A one-way air inlet channel of the rear connector is matched with a check valve mounted in a check valve seat. The lower end of the cylinder block is connected with a drill bit through a connector. The check valve seat is provided with an air distributing hole. A positioning sleeve is disposed below the check valve seat. The inner wall of the positioning sleeve is matched with an air distributing rod. A plurality of rubber rings are further disposed between the inner wall of the positioning sleeve and the air distributing rod. The air distributing hole is communicated with a central duct of the air distributing rod. The lower end of the air distributing rod is matched with a piston upper air supply chamber at the upper end of the piston. The piston upper air supply chamber is communicated with a piston upper exhaust hole. A piston lower air supply chamber which is communicated with a piston lower exhaust hole is disposed at the lower end of the piston. A guide sleeve is disposed between the lower end of the piston and the cylinder block. By the valveless single cylinder blind hole channel down-hole hammer, operation stability of the hammer is improved, the service lives of the rubber rings are prolonged, and reliability of an air distributing mechanism is improved.

Description

technical field [0001] The invention relates to a down-the-hole hammer, in particular to a valveless single-cylinder type blind hole down-the-hole hammer. Background technique [0002] The main feature of the existing domestic piston guide sleeve type valveless single-cylinder down-the-hole impactor is that the small end of the piston impacts the drill bit when the piston moves, and the large end of the piston interacts with the cylinder body for gas distribution and guidance, which has the following disadvantages: [0003] 1. There is a rubber ring between the valve seat and the rear joint, which can absorb a certain amount of energy when the impactor is working. However, after the impactor has been working for a period of time, the rubber is easy to age and deform, which will cause vibration and seriously affect all parts. The accuracy of fit between components reduces work efficiency and shortens the working life of the impactor. [0004] 2. The gas distribution rod, val...

AI Technical Summary

Problems solved by technology

[0003] 1. There is a rubber ring between the valve seat and the rear joint, which can absorb a certain amount of energy when the impactor is working. However, after the impactor has been working for a period of time, the rubber is easy to age and deform, which will cause vibration and seriously affect all parts. The precision of fit between parts reduces work efficiency and shortens the working life of the impactor

[0004] 2. The air distribution rod, the valve seat and the rear joint are rigidly connected by means of cross pins. The vibration and reaction force generated by the impactor during operation cannot be eliminated or weakened and are transmitted to the drilling rig, reducing work efficiency and causing machine parts to be damaged and scrapped early.

[0005] 3. The gas distribution rod is long and has a large air supply hole, which is prone to early fracture and reduces the reliability of the impactor when it is working.

[0006] 4. There are more intake and exhaust passages, resulting in greater air pressure loss

[0007] 5. There are many air distribution channels on the piston, the air channel turns and the distance is long, and the gas pressure loss is large, which makes it sensitive to heat treatment reaction, stress concentration, and often fails early due to process and structural reasons.

[0008] Chinese patent "201020546451.2" discloses a high-efficiency down-the-hole impactor with a piston guide sleeve type valveless single cylinder, which can overcome the defects in the prior art. The existing problem is that the gas distribution rod and the check valve seat are integrated, And there are many inclined holes connected with the central channel of the gas distribution rod, which is difficult to process, the shaft diameter is relatively large, and the stress condition is not good. Under the condition of alternating stress, the gas distribution rod or the gap between the gas distribution rod and the cylinder body The sealing ring between is easily damaged

The vibration generated by the valve rod affected by the piston will also affect the sealing condition of the check valve

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