CN201152142Y

CN201152142Y - Latent punch

Info

Publication number: CN201152142Y
Application number: CNU2008203000963U
Authority: CN
Inventors: 张泉; 严宏嘉
Original assignee: LONGYUAN PETROLEUM TECHNOLOGY DEVELOPMENT Co Ltd SICHUAN
Current assignee: LONGYUAN PETROLEUM TECHNOLOGY DEVELOPMENT Co Ltd SICHUAN
Priority date: 2008-01-17
Filing date: 2008-01-17
Publication date: 2008-11-19
Anticipated expiration: 2018-01-17

Abstract

The utility model discloses a down-the-hole hammer with a good dustproof structure, which comprises a cylinder and a piston. The piston is sleeved and arranged in the cylinder. A dustproof seal is arranged between the cylinder and the piston. The structure that a seal ring is arranged between the cylinder and the piston not only can improve the effect that only the junction surface of the cylinder and the piston is depended by the down-the-hole hammer for sealing an upper air chamber and a lower air chamber, but also can discharge grinding objects generated by the mutual movement of the piston and the cylinder and the entered dust in time. The junction surface is kept clean and the work efficiency of the down-the-hole hammer is improved. In addition, the seal performance of the piston and the cylinder is improved. As a result, on one hand, the work atmospheric pressure of the hammer is improved and the striking efficiency of the hammer is improved; on the other hand, the manufacturing accuracy of the piston and the cylinder can be properly reduced and the production cost can be reduced.

Description

Down-the-hole air hammer

Technical field

The utility model relates to a kind of pneumatic rock drilling machinery, is applicable to construction operations such as the shot hole that carries out in engineering fields such as oil exploration, mine, water conservancy, shot hole.

Background technology

Present on the structure design of down-the-hole air hammer, no matter be that the valve impactor is arranged, or the valveless impactor, on the structure design of piston and cylinder, all do not consider dust prevention.So in actual use, the dust of down-hole and the aboveground impurity that enters impactor by drill pipe bore will enter in the impactor, cause do at a high speed, the wearing and tearing of the piston of high-frequency relative motion and cylinder, jam etc., influencing the service efficiency of impactor, is the main cause that causes impactor to lose efficacy.

On the other hand, the contact surface of piston and cylinder also must play sealing function, but owing to need do high-frequency reciprocating motion between them, fit clearance is little can influence their relative motion, and the sealing that the gap is big can influence goes up lower chamber causes the high pressure draught leakage, the wind energy loss, reduce impact energy and frequency of impact, influence service efficiency, this also is the technical bottleneck of this type of impactor.

In the gas distribution structure design that the valve impactor is arranged at present, usually to utilize the part inner headed face of outer tube or the cylinder inner headed face forms a pair of relative motion with the periphery of piston counterpart, the difficulty of processing and the manufacturing cost of outer tube have so just been improved, simultaneously, because the periphery of piston is with cylinder and the common counterpart that constitutes one group of relative motion of outer tube inner headed face, in process, be difficult to guarantee their axiality, general solution is to reduce their machining accuracy, will have influence on the sealing of the last lower chamber that forms by the variation of the relative position between them like this, form and let out in certain, cause the wind energy loss, reduce impact energy and frequency of impact.

The utility model content

Technical problem to be solved in the utility model provides the down-the-hole air hammer with better dustproof construction.

The technical scheme that its technical problem that solves the utility model adopts is: down-the-hole air hammer, comprise cylinder and piston, and piston bush is contained in the cylinder, is provided with dust seal between cylinder and piston.

Described piston is provided with seal groove, and dust seal is installed in the seal groove.

The quantity of described dust seal is at least one, along axially spaced-apart setting between cylinder and the piston.

Described dust seal is a circular ring type, and its section is for becoming trapezium structure, and periphery is the conical surface.

The conical surface cutting edge of described dust seal is towards lower chamber.

Dust seal is provided with groove towards the end face of lower chamber.

The beneficial effects of the utility model are, this structure of a joint ring is installed between piston and cylinder, not only can improve the bonding surface that this down-the-hole air hammer only relies on piston and cylinder and play the effect that lower chamber is gone up in sealing, and piston and cylinder grinding thing that produces in moving mutually and the dust that enters in time can also be discharged, the cleaning that keeps bonding surface improves piston and cylinder operation efficient.Owing to improved the sealing performance of piston and cylinder, having improved the operating air pressure of impactor on the one hand simultaneously, the impactor target efficiency is effectively improved, is the quality of fit that can suitably reduce piston and cylinder on the other hand, reduces production costs.

Description of drawings

This manual comprises following 4 width of cloth accompanying drawings:

Fig. 1 is the front view of the utility model down-the-hole air hammer.

Fig. 2 is the partial enlarged drawing of A in the utility model down-the-hole air hammer.

Fig. 3 is the front view of dust seal in the utility model down-the-hole air hammer.

Fig. 4 is the B-B sectional view of dust seal in the utility model down-the-hole air hammer.

Component, position and numbering among the figure: cylinder 1, piston 2, dust seal 3, seal groove 4, cutting edge 5, lower chamber 6 and groove 7.

The specific embodiment

Below in conjunction with accompanying drawing the utility model is further specified.

See figures.1.and.2, down-the-hole air hammer comprises cylinder 1 and piston 2, and piston 2 is sleeved in the cylinder 1, is provided with dust seal 3 between cylinder 1 and piston 2.This set has the down-the-hole air hammer of dust seal 3 to solve preferably to enter the dust problem in the cylinder; Simultaneously, owing to increased the gap between piston 2 and the cylinder 1, play sealing function by dust seal 3, the friction that this has just significantly reduced between piston 2 and the cylinder 1 has prolonged application life of down-the-hole air hammer.

In order to make installation dustproof convenient, dust seal 3 designs have an opening, and piston 2 is provided with seal groove 4, and dust seal 3 is installed in the seal groove 4.

In order to make dust seal reach better effect, the operation of piston 2 in cylinder 1 is more steady, in seal groove 4, install the quantity of dust seal 3 be at least one, along axially spaced-apart setting between cylinder 1 and the piston 2.

As shown in Figure 3 and Figure 4, dust seal 3 is a circular ring type, and its section is a trapezium structure, periphery is the conical surface, this structure has guaranteed the sealing of lower chamber on the cylinder 1, and the inner headed face that the while can make the outer conical surface of dust seal 3 remain with cylinder 1 is the line contact, has reduced frictional resistance.The cutting edge 5 of the conical surface can utilize the cutting edge 5 of the conical surface to wipe off attached to the dust on the cylinder wall towards lower chamber 6.Dust seal 3 is provided with groove 7 towards the end face of lower chamber 6, is used to compile impurity and scrapings.Dust seal 3 adopts the heat resistant and wear resistant material, after dust seal 3 wearing and tearing, is replaced with new dust seal 3, and this down-the-hole air hammer can work on.

Claims

1. down-the-hole air hammer comprises cylinder (1) and piston (2), and piston (2) is sleeved in cylinder (1) cylinder body, it is characterized in that: be provided with dust seal (3) between cylinder (1) and piston (2).

2. described down-the-hole air hammer as claimed in claim 1 is characterized in that: piston (2) is provided with seal groove (4), and dust seal (3) is installed in the seal groove (4).

3. described down-the-hole air hammer as claimed in claim 1 or 2 is characterized in that: the quantity of described dust seal (3) is at least one, along axially spaced-apart setting between cylinder (1) and the piston (2).

4. described down-the-hole air hammer as claimed in claim 1 or 2 is characterized in that: described dust seal (3) is a circular ring type, and its section is a trapezium structure, and periphery is the conical surface.

5. described down-the-hole air hammer as claimed in claim 4 is characterized in that: the conical surface cutting edge (5) of described dust seal (3) is towards lower chamber (6).

6. described down-the-hole air hammer as claimed in claim 5 is characterized in that: dust seal (3) is provided with groove (7) towards the end face of lower chamber (6).