CN2212655Y

CN2212655Y - Pneumatic impact mechanism

Info

Publication number: CN2212655Y
Application number: CN 94239308
Authority: CN
Inventors: 王忠发
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-09-05
Filing date: 1994-09-05
Publication date: 1995-11-15
Anticipated expiration: 2004-09-05

Abstract

The utility model relates to a pneumatic impact mechanism. The utility model is suitable for working tools, e. g. pneumatic picks, pneumatic chipping hammers, pneumatic tampers, etc. and suitable for engineering machines, e. g. pneumatic rock drills, down-the-hole drills, etc. The impact mechanism adopts a central gas supply, and the means of cylinder wall air supply is changed so that time and material are saved when processing a cylinder. A center air pipe of the impact mechanism is fixed. A sealed kinematic pair is formed at the tail part of an impact hammer. The utility model has the advantages that simple structure and high reliability. In addition, the impact mechanism is has a method for preventing the phenomena that the cylinder is stricken by the stroke of the impact hammer and a valve seat is stricken by the return stroke of the impact hammer, thus, possible damages are avoided, and the vibration of the machine body is reduced.

Description

Pneumatic impact mechanism

The utility model relates to a kind of gas impact machine, is applicable to power tools such as gas pick, pneumatic chipping hammer, pneumatic tamping tool, also is applicable to engineering machinery such as air drill, hidden hole drilling.

Present widely used gas pick, pneumatic chipping hammer, pneumatic tamping tool, air drill, hidden hole drilling etc., all from the casing wall air feed, casing wall is thick, not only takes material, and processing capacity is big.

The described beater mechanism of patent (CN85106202A) adopts a flexibility central siphon air guide of moving with distributing valve, and the flexural deformation of dependence central siphon compensates the coaxiality error of inner body.This central siphon the time bears the thrust of valve body and pulling force, and the frictional resistance and the inertia force of termination in work, and these power all belong to shock loading, and its effect frequency equals frequency of impact.This working condition all has quite high requirement to the performance and the central siphon of central siphon material with connecting of valve body and termination, and it is very big specifically to implement difficulty, and structure is also complicated.

The purpose of this utility model is the gas impact machine that design is a kind of from central gas-supply, simple in structure, reliability is high.

The beater mechanism of the utility model, adopt central gas-supply, chamber, a valve body left side communicates with the right chamber of block stamp through center tracheae and block stamp endoporus, the gas port of the right chamber of valve body on valve seat communicates with chamber, a block stamp left side, the center tracheae is fixed, its end reaches in the endoporus of block stamp, constitutes the kinematic pair of sealing function at the block stamp left end.During beater mechanism work, the cause and the consequence of the motion of valve body and block stamp the other side's motion each other, thus realize the continuous valve body commutation motion and the reciprocal ballistic motion of block stamp.

Block stamp in stroke and backhaul at the end constitutes buffering pneumatic cushion with cylinder body and valve seat respectively, can avoid the impingement phenomenon of block stamp and cylinder body and valve seat, and the damage so that elimination may cause thus reduces body vibration.

Can install lining at the block stamp left end, be convenient to the processing of block stamp endoporus.Lining uses abrasion resistance and good metal or the plastics of self lubricity to manufacture, and can reduce frictional resistance, improves sealing.

Remarkable result of the present utility model is that beater mechanism has adopted central gas-supply, the casing wall attenuate, cylinder body is processed the material-saving that saves time.During beater mechanism work, have only the motion of valve body and block stamp, other part maintains static, and has therefore improved the reliability of beater mechanism work, and simple in structure, good manufacturability.

Below in conjunction with accompanying drawing the course of work of the present utility model is described in detail.

Fig. 1 is a generalized section of the present utility model.When beater mechanism was started working, valve body 1 and block stamp 5 were positioned at the left side or the right of stroke separately simultaneously, this can by intrinsic characteristics of the beater mechanism course of work or gravity be used for realize.

If valve body 1 and block stamp 5 are positioned at the left side of stroke separately at this moment, valve body 1 left chamber is closed, calm the anger and enter block stamp 5 left chambeies through valve body 1 right chamber, promoting block stamp 5 moves right, enter stroke, after block stamp 5 was closed steam vent E2, block stamp 5 right chamber air were compressed, air pressure raises, and enters valve body 1 left chamber through center tracheae 4.When the right side of block stamp 5 touched the left side of drilling tool 7, the output impact energy was externally done work, and stroke finishes.Simultaneously, steam vent E1 opens, block stamp 5 left chambeies and valve body 1 right chamber instantaneous loss of pressure, valve body 1 moves down into the right at its left chamber gas pressure, so valve body 1 right chamber is closed, calming the anger enters block stamp 5 right chambeies through valve body 1 left chamber and center tracheae 4, promote block stamp 5 to left movement, enter backhaul.After block stamp 5 was closed steam vent E1, block stamp 5 left chamber air were compressed, and air pressure raises, and enters valve body 1 right chamber.When steam vent E2 opens, block stamp 5 right chambeies and valve body 1 left chamber instantaneous loss of pressure, valve body 1 moves down into the left side at its right chamber gas pressure, so valve body 1 left chamber is closed, calm the anger and enter block stamp 5 left chambeies through valve body 1 right chamber, block stamp 5 decelerations--stopping--being moved right, enter stroke once more, so circulation is gone down.

When block stamp 5 finished at stroke, if phenomenon or overtravel occur fanning the air, the inner cylinder face D of its right-hand member external cylindrical surface C and cylinder body 6 right-hand members constituted clearance seal, has just produced buffering pneumatic cushion Q2 between block stamp 5 and the cylinder body 6 like this, had prevented the bump of block stamp 5 with cylinder body 6.During return movement, the inner cylinder face A of its left end external cylindrical surface B and valve seat 2 constitutes clearance seal to block stamp 5, has just produced buffering pneumatic cushion Q1 between block stamp 5 and the valve seat 2 so left, thereby has prevented the bump of block stamp 5 and valve seat 2.

At block stamp 5 left ends lining 3 is housed, lining 3 is to manufacture with abrasion resistance and good metal or the plastics of self lubricity.

Claims

1, a kind of gas impact machine adopts central gas-supply, it is characterized in that center tracheae (4) is fixed, and its end reaches in the endoporus of block stamp (5), constitutes the kinematic pair of sealing function at the left end of block stamp (5).

2, beater mechanism according to claim 1 is characterized in that, block stamp (5) in stroke and backhaul at the end constitutes buffering pneumatic cushion (Q2), (Q1) with cylinder body (6) and valve seat (2) respectively.

3, beater mechanism according to claim 1 is characterized in that, the left end of block stamp (5) is equipped with lining (3).

4, lining according to claim 3 (3) is to manufacture with abrasion resistance and good metal or the plastics of self lubricity.