CN116551630A - Pneumatic impact tool with vibration damping structure - Google Patents

Abstract

The invention discloses a pneumatic impact tool with a damping structure, which is related to a hand tool. The pneumatic impact tool with vibration-absorbing structure includes a handle, and a cylinder part and an air flow reversing valve are arranged inside. The cylinder part is connected with an inner pipe part, which includes a ring wall and a chamber, a hammer body is arranged in the chamber and divided into front and rear chambers, the ring wall is provided with at least one exhaust hole, and the air flow reversing valve can be Switches the airflow input to the front and rear chambers. An exhaust passage is provided on the outer peripheral surface of the hammer body, which communicates with the front chamber and does not communicate with the rear chamber. When the high-pressure gas enters the front chamber, the hammer body is pushed backward, and the high-pressure gas is released through the exhaust channel and the exhaust hole, thereby reducing the force of the hammer body being pushed.

Description

Pneumatic impact tool with vibration-damping structure

technical field

The present invention relates to hand tools, in particular to a pneumatic impact tool, especially a pneumatic impact tool with a vibration-absorbing structure.

Background technique

Pneumatic impact tools will vibrate due to the reciprocal movement of the hammer body during use, which will have a negative impact on the palm of the user's hand after long-term use, especially the more powerful the impact force, the resulting The bigger the vibration, the bigger the damage to the user, so it must be improved.

No. I235700 and No. I729809 of China Taiwan Invention Patent Announcement disclose a kind of pneumatic tool respectively. Cushioning effect, and reduce the vibration caused by the hammer to the barrel. Figure 4 of No. I729809 discloses another kind of pneumatic tool again, and its gun barrel rear is provided with a spring or a rubber block, pushes the spring or rubber block for the hammer body when moving backward, and produces cushioning effect by its deformation, And reduce the vibration caused by the hammer to the barrel.

The above-mentioned two well-known structures all add other components in addition to the existing structure of the pneumatic tool (changing the space configuration to form an air chamber, adding a spring or rubber block, etc.), and then cushioning the air tool after the large vibration is generated. To reduce the vibration, in addition to the disadvantage of increased cost, the most important thing is that the vibration reduction effect is not satisfactory, and the user still feels uncomfortable in the hand during operation.

In the structure disclosed in the 5th figure of the above-mentioned No. I235700 patent, it is provided with an air intake pipe connected to the front end of the gun barrel, so that the hammer body that has moved to the front end of the gun barrel can be moved backward through the high-pressure gas, and There is a vent hole in the middle of the gun barrel for pressure relief. However, in the process of the hammer body hitting the tool head forward and rebounding backwards, the high-pressure gas in the gun barrel must be released after the hammer body passes through the vent hole in the middle position, but the gas has already been released before the hammer body is released. The high pressure drives the hammer back to the rear end of the gun barrel, thereby impacting the rear end of the gun barrel with greater force, which is the root cause of the vibration of the pneumatic tool.

In view of this, how to improve the above problems is the primary task to be solved by the present invention.

Contents of the invention

The main purpose of the present invention is to provide a pneumatic impact tool with a damping structure, which is provided with an exhaust channel connected to the front chamber of the inner pipe on the hammer body, and continues to deflate at the beginning of the retreat process of the hammer body, thereby directly Weaken the impact force of hammer receding, thereby reducing vibration. The invention thus produces a vibration-damping effect without adding additional components.

In order to achieve the above-mentioned purpose, the present invention provides a pneumatic impact tool with a damping structure, which includes:

A handle, which is provided with an alcove inside, and the handle is provided with an air intake channel connected to the alcove, wherein an air flow switch is arranged in the air intake channel;

A cylinder part accommodated in the alcove, the cylinder part is provided with an air flow reversing valve, and the side wall of the cylinder part is provided with a through hole communicating with the air inlet passage, so that high-pressure gas can be introduced into the air flow reversing valve. valve;

An inner pipe member, which includes a ring wall fixed to the cylinder member and a chamber surrounded by the ring wall, and a hammer body closely connected to the ring wall is arranged in the chamber so that the chamber is partitioned It is a front chamber and a rear chamber. The front end of the ring wall is provided with a tool head, and the ring wall is provided with at least one exhaust hole for connecting the chamber to the outside world. The reversing valve and the air flow passage of the front chamber, the air flow passage forms a first air inlet in the front chamber, the rear chamber is provided with a second air inlet connected to the air flow reversing valve, the air flow reversing The air flow switchable by the valve is input into the front chamber from the first air inlet or into the rear chamber from the second air inlet;

The above-mentioned hammer body has a head end close to the first air inlet and a tail end close to the second air inlet, and an exhaust passage is provided on the outer peripheral surface of the hammer body, wherein the exhaust passage extends to the The head end is connected to the front chamber, and the exhaust passage is not connected to the tail end, and thus not connected to the rear chamber. When high-pressure gas is injected into the rear chamber from the second air inlet, the hammer body is pressurized The gas is pushed to move toward the tool head; when the high-pressure gas is injected into the front chamber from the first air inlet, the hammer body is pushed away from the tool head by the high-pressure gas, during the process, when the hammer body is discharged When the gas channel communicates with the exhaust hole, the high-pressure gas in the front chamber will leak out through the exhaust channel and the exhaust hole, thereby reducing the force of the hammer body being pushed.

In one embodiment, the exhaust channel is formed by a helical groove recessed on the outer peripheral surface of the hammer body.

Preferably, when the hammer body is in contact with the tool head, the groove communicates with the exhaust hole. Furthermore, the surrounding wall is provided with three vent holes, and the distances between the vent holes and the tool head are respectively different; when the hammer body is in contact with the tool head, the groove and the closest The two exhaust holes of the tool head are connected.

In another embodiment, the exhaust passage includes a groove part and a cylindrical gap connected with each other. The groove part extends to the head end in a straight line along the hammer moving direction and communicates with the front chamber. , the cylindrical gap is the space between the belt-shaped concave portion recessed on the outer peripheral surface of the hammer body and the ring wall.

Preferably, when the hammer body is in contact with the tool head, the cylindrical gap communicates with the exhaust hole. Furthermore, the surrounding wall is provided with three air vents, and the distances between each air vent and the tool head are different; The air vent closest to the tool head is connected.

Preferably, the distance between the vent hole and the tool head is no more than half the total length of the chamber.

The above objects and advantages of the present invention can be easily understood from the following detailed descriptions and accompanying drawings of selected embodiments.

Description of drawings

Fig. 1 is the three-dimensional exploded schematic view of the first embodiment of the present invention;

2 is a schematic cross-sectional view of the whole of the first embodiment of the present invention;

Fig. 3 is a perspective view of the hammer body of the first embodiment of the present invention;

4 to 6 are schematic diagrams of the action states of the first embodiment of the present invention;

Fig. 7 is a three-dimensional exploded schematic view of the second embodiment of the present invention;

8 is a schematic cross-sectional view of the whole of the second embodiment of the present invention;

Fig. 9 is a perspective view of the hammer body of the second embodiment of the present invention;

10 to 12 are schematic diagrams of the action states of the second embodiment of the present invention.

Explanation of main reference signs:

Handle 1 Rear chamber 322

Alcove 11 Airflow channel 33

Air intake channel 12 First air intake port 34

Air flow switch 13 Second air inlet 35

Button 14 Vent 36

Spring 15 Hammer 4

Barrel 2 head end 41

Through hole 21 Tail end 42

Air flow reversing valve 22 Outer peripheral surface 43

Inner pipe 3 Groove 44

Ring wall 31 Tool head 5

Chamber 32 Hammer 9

Front chamber 321 Head end 91

Tail end 92 Cylindrical gap 96

Outer peripheral surface 93 Band-shaped recess 97

groove part 95

Detailed ways

Please refer to FIGS. 1 to 2 , which show the first embodiment of the pneumatic impact tool with vibration-damping structure provided by the present invention, which includes a handle 1 , a cylinder 2 , an inner pipe 3 and a hammer 4 . The handle 1 can be shaped like a pistol or a straight cylinder. In this embodiment, the handle 1 is shaped like a pistol. The top of the handle 1 is provided with an alcove 11 . The bottom of the handle 1 is provided with an air inlet passage 12 extending upwards and communicating with the alcove 11 for connecting to an external high-pressure gas supply source. An airflow switch 13 is provided in the air intake channel 12 to control the passage of airflow, and a button 14 is connected to the airflow switch 13 on one side of the handle 1 for operation.

In this embodiment, the barrel 2 is accommodated in the alcove 11 , and the bottom of the alcove 11 is provided with a spring 15 for buffering the barrel 2 . The side wall of the cylinder part 2 is provided with a through hole 21 communicating with the air inlet passage 12, and a well-known air flow reversing valve 22 is arranged in the cylinder part 2. After the high-pressure gas is introduced into the air inlet passage 12, it will pass through the The through hole 21 enters the gas flow reversing valve 22, and the gas flow reversing valve 22 is used to output the high-pressure gas in two different paths.

The inner pipe member 3 is a circular pipe structure and has a ring wall 31 and a chamber 32 surrounded by the ring wall 31, wherein the ring wall 31 extends in the barrel member 2 and is screwed to the barrel On the member 2; the chamber 32 is provided with a hammer body 4 closely connected to the ring wall 31, and then the chamber 32 is divided into a front chamber 321 and a rear chamber 322. The inner pipe member 3 protrudes from the cylinder member 2, and a tool head 5 is provided at the front end thereof, and the tool head 5 can be replaced according to actual usage requirements. The interior of the ring wall 31 that is different from the chamber 32 is provided with an air passage 33 communicating with the air flow reversing valve 22, which forms a first air inlet 34 in the front chamber 321; and the rear chamber 322 is provided There is a second air inlet 35 connected to the airflow reversing valve 22 . Accordingly, the air flow reversing valve 22 can selectively output the high-pressure gas to the air flow channel 33 at an appropriate time, and then inject the high-pressure gas into the front chamber 321 through the first air inlet 34; Two air inlets 35 are injected into the rear chamber 322 .

Furthermore, the surrounding wall 31 is provided with at least one exhaust hole 36 that allows the chamber 32 to communicate with the outside world; They are arranged in a straight line, and the distances between the exhaust holes 36 and the tool head 5 are different. Furthermore, the above-mentioned three exhaust holes 36 are arranged between the first air inlet 34 and the second air inlet 35, and the distance between the exhaust holes 36 and the tool head 5 is not greater than the cavity half of the total length of the chamber 32.

As shown in Figures 2 to 3, the hammer body 4 includes a head end 41 close to the first air inlet 34 and a tail end 42 close to the second air inlet 35, with an outer peripheral surface 43 between them. , the outer diameter of the hammer body 4 is equal to the inner diameter of the chamber 32 , and the outer peripheral surface 43 is in close contact with the ring wall 31 . An exhaust passage is provided on the outer peripheral surface 43, wherein the exhaust passage extends to the head end 41 and communicates with the front chamber 321, and the exhaust passage is not connected to the tail end 42, so the exhaust passage does not It communicates with the rear chamber 322 . In this embodiment, the exhaust passage is formed by grooves 44 recessed on the outer peripheral surface 43, wherein the grooves 44 extend in a spiral shape, and the number and pitch of the grooves 44 can be changed according to design requirements. .

In this embodiment, the relative positional relationship between the groove 44 and the exhaust hole 36 is shown in FIG. 4 . Specifically, when the hammer body 4 moves to the position of contacting the tool head 5 , the groove 44 communicates with the two exhaust holes 36 closest to the tool head 5 .

With the above structure, when the button 14 is pressed to control the airflow switch 13 so that the high-pressure gas is introduced into the airflow reversing valve 22 through the air inlet passage 12, the airflow reversing valve 22 first sends the high-pressure gas from the second air inlet 35 After injecting into the rear chamber 322, the high-pressure gas pushes the hammer body 4 to move forward at a high speed, and hits the tool head 5 to produce a working effect. Then, the gas flow reversing valve 22 switches the gas supply path, stops injecting the high-pressure gas into the rear chamber 322 from the second air inlet 35, and instead introduces the high-pressure gas into the air flow passage 33, and then the first gas inlet The air port 34 feeds into the front chamber 321 . As for the technique of switching the air supply path by the airflow reversing valve 22, it is a common and well-known technique, and will not be repeated here.

Now the high-pressure gas starts to push the hammer body 4 to move backward. As shown in FIG. 4, when the hammer body 4 starts to leave the tool head 5, the high-pressure gas in the front chamber 321 can start to pass through the channel formed by the connected groove 44 and the exhaust hole 36. Leak all the way to the outside, reduce the pressure in the front chamber 321, and then weaken the force that the hammer body 4 is pushed. Accordingly, when the hammer body 4 moves to the end of the stroke as shown in Figure 6, the vibration caused The magnitude will decrease.

And the present invention is in the action process of damping, when this hammer body 4 is at the starting point of stroke as shown in Figure 4, communicates with this vent hole 36 by this groove 44, then can begin to deflate at this moment, in other words, Compared with the known structure, the deflation timing of the present invention is greatly earlier, so the force of pushing the hammer body 4 can be greatly weakened.

Moreover, during the retreat process of the hammer body 4, as shown in Figure 5, different exhaust holes 36 can be connected through the groove 44 to continuously deflate, so that the force of the hammer body 4 being pushed back continues to be weakened, and the vibration will be reduced. was substantially weakened.

The characteristic of the present invention is that on the source of the vibration of the pneumatic tool (that is, the impact force of the hammer body 4 retreating), the mode of deflation is adopted to directly weaken the impact force of the hammer body 4 retreating, so as to achieve the purpose of curing the root cause, and a more familiar structure can be produced. Better vibration reduction effect, at the same time, it does not affect the power of the high-pressure gas to drive the hammer body forward and hit the tool head, so it can produce the effect of vibration reduction under the premise of taking into account the output power of the pneumatic tool.

7 to 9 show the second embodiment of the present invention, which is a pneumatic impact tool with the same structure as the above embodiment, the difference is the structure of the hammer body 9, so the subsequent description will add the structure of the above embodiment.

The hammer body 9 also has a head end 91 and a tail end 92 like the above-mentioned embodiment, and there is an outer peripheral surface 93 between the two, and an exhaust passage is provided on the outer peripheral surface 93, wherein the exhaust passage is the same as that of the above-mentioned embodiment. The same extends to the head end 91 and communicates with the front chamber 321 , and the exhaust passage is not connected to the tail end 92 , so the exhaust passage does not communicate with the rear chamber 322 . In this embodiment, the exhaust channel includes a groove portion 95 and a cylindrical gap 96 . The groove portion 95 extends linearly along the moving direction of the hammer body 9 , one end of which is connected to the head end 91 and communicates with the front chamber 321 , and the other end is connected to the cylindrical gap 96 . The cylindrical gap 96 is a space between a belt-shaped recess 97 recessed from the outer peripheral surface 93 and the ring wall 31 .

Therefore, the relative positional relationship between the exhaust channel and the exhaust hole 36 is formed as shown in FIG. 10 . Specifically, in this embodiment, when the hammer body 9 moves to the position where it contacts the tool head 5 , the cylindrical gap 96 communicates with the two exhaust holes 36 closest to the tool head 5 .

Same as the first embodiment, in this embodiment, when the hammer body 9 is at the starting point of the stroke as shown in Figure 10, the exhaust hole 36 is connected through the cylindrical gap 96, and then the gas can start to leak at this time, in other words , the timing of deflation is much earlier than that of the known structure. While the hammer body 9 is retreating, as shown in Figure 11, different exhaust holes 36 can be connected through the cylindrical gap 96 to continuously deflate, and then like the first embodiment, the force of the hammer body 9 being pushed back is continuously weakened. Strength, so that when the hammer body 9 reaches the stroke end point shown in Figure 12, the vibration is greatly weakened.

The disclosure of the above embodiments is only used to illustrate the present invention, not to limit the present invention, and any replacement of equivalent components should still fall within the scope of the present invention.

To sum up, those skilled in the art can understand that the present invention can achieve the above-mentioned purpose, and it actually complies with the provisions of the Patent Law, so the application is filed according to the law.

Claims (10)

1. A pneumatic impact tool with a damping structure, characterized in that it comprises: A handle, which is provided with an alcove inside, and the handle is provided with an air intake channel connected to the alcove, wherein an air flow switch is arranged in the air intake channel; A cylinder part accommodated in the alcove, the cylinder part is provided with an air flow reversing valve, and the side wall of the cylinder part is provided with a through hole communicating with the air inlet passage, so that high-pressure gas can be introduced into the air flow reversing valve. valve; An inner pipe member, which includes a ring wall fixed to the cylinder member and a chamber surrounded by the ring wall, and a hammer body closely connected to the ring wall is arranged in the chamber so that the chamber is partitioned It is a front chamber and a rear chamber. The front end of the ring wall is provided with a tool head, and the ring wall is provided with at least one exhaust hole for connecting the chamber to the outside world. The reversing valve and the air flow passage of the front chamber, the air flow passage forms a first air inlet in the front chamber, and the rear chamber is provided with a second air inlet connected to the air flow reversing valve, and the air flow can be from The first air inlet enters the front chamber, or enters the rear chamber from the second air inlet; The above-mentioned hammer body has a head end close to the first air inlet and a tail end close to the second air inlet, and an exhaust passage is provided on the outer peripheral surface of the hammer body, wherein the exhaust passage extends to the The head end is connected to the front chamber, and the exhaust passage is not connected to the tail end, and thus not connected to the rear chamber. When high-pressure gas is injected into the rear chamber from the second air inlet, the hammer body is pressurized The gas is pushed to move toward the tool head; when the high-pressure gas is injected into the front chamber from the first air inlet, the hammer body is pushed away from the tool head by the high-pressure gas, and in the process, when the exhaust channel communicates When the exhaust hole is used, the high-pressure gas in the front chamber leaks out through the exhaust channel and the exhaust hole, thereby reducing the force of the hammer body being pushed. 2 . The pneumatic impact tool with a vibration-damping structure according to claim 1 , wherein the exhaust channel is formed by a helical groove recessed on the outer peripheral surface of the hammer body. 3 . 3. The pneumatic impact tool with a vibration-damping structure as claimed in claim 2, wherein when the hammer body is in contact with the tool head, the groove communicates with the exhaust hole. 4. The pneumatic impact tool with a vibration-damping structure as claimed in claim 2, wherein the surrounding wall is provided with three exhaust holes, and the distances between each exhaust hole and the tool head are different. 5. The pneumatic impact tool with a vibration-damping structure according to claim 4, wherein when the hammer body is in contact with the tool head, the groove and the two closest to the tool head The exhaust holes are connected. 6. The pneumatic impact tool with vibration-damping structure according to claim 1, wherein the exhaust passage includes a groove portion and a cylindrical gap connected thereto, and the groove portion moves along the hammer body The direction extends to the head end in a straight line and communicates with the front chamber. The cylindrical gap is the space between the belt-shaped concave portion recessed on the outer peripheral surface of the hammer body and the ring wall. 7. The pneumatic impact tool with a vibration-damping structure as claimed in claim 6, wherein when the hammer body is in contact with the tool head, the cylindrical gap communicates with the exhaust hole. 8 . The pneumatic impact tool with a vibration-damping structure as claimed in claim 6 , wherein the surrounding wall is provided with three exhaust holes, and the distances between each exhaust hole and the tool head are different. 9. The pneumatic impact tool with damping structure according to claim 8, characterized in that, when the hammer body is in contact with the tool head, the cylindrical gap and the two closest to the tool head The exhaust holes are connected. 10. The pneumatic impact tool with a vibration-damping structure as claimed in claim 1, wherein the distance between the exhaust hole and the tool head is not greater than half of the total length of the chamber.