TWM627122U - Pneumatic impact tool with vibration damping structure - Google Patents

Abstract

The utility model relates to a pneumatic impact tool with a vibration damping structure, which comprises a handle, a cylindrical part and an air flow reversing valve inside. The cylinder piece is connected with an inner pipe piece, which includes a ring wall and a chamber, a hammer body is arranged in the chamber and is divided into front and rear chambers, the ring wall is provided with at least one exhaust hole, and the air flow reversing valve can Switch airflow input to front and rear chambers. The outer peripheral surface of the hammer body is provided with an exhaust passage, which communicates with the front chamber and does not communicate with the rear chamber. When the high-pressure gas is input into the front chamber, the hammer body is pushed backward, and the high-pressure gas is discharged through the exhaust passage and the exhaust hole, thereby reducing the force of the hammer body to be pushed.

Description

Pneumatic impact tool with vibration damping structure

This creation relates to hand tools, especially a pneumatic impact tool.

Pneumatic impact tools will vibrate due to the reciprocating displacement of the hammer body during use, which will have adverse effects on the palm of the user when used for a long time. The greater the vibration, the greater the damage to the user, so it must be improved.

my country's Invention Patent Announcements No. I235700 and No. I729809 respectively disclose a pneumatic tool. In the structure of the barrel, an air chamber is arranged at the rear, so as to squeeze the air in the air chamber when the hammer body moves backward, so as to produce a buffer effect, and Reduce the vibration caused by the hammer body to the barrel. Figure 4 of I729809 discloses another pneumatic tool. There is a spring or a rubber block behind the barrel to push the spring or rubber block when the hammer body moves backwards, and it deforms to produce a buffer effect and lower the hammer. Vibration caused by the body to the barrel.

The above two conventional structures both add other components to the existing structure of the pneumatic tool (changing the space configuration to form an air chamber, adding a spring or a rubber block, etc.), and after the pneumatic tool generates a large amount of vibration, it is buffered. To reduce the vibration, in addition to the disadvantage of increased cost, the most important thing is that the vibration reduction effect is not ideal, and the user still feels uncomfortable in the operation.

In the structure disclosed in Fig. 5 of the above-mentioned I235700 patent, it is provided with an air intake pipe connected to the front end of the barrel, so as to move the hammer body that has moved to the front end of the barrel through high-pressure gas to move it backward, And about the middle of the barrel is provided with an exhaust hole for pressure relief. However, when the hammer body hits the tool head forward and rebounds back, the high-pressure gas in the barrel must be released after the hammer body passes through the exhaust hole in the middle position, but the gas has been discharged before it is released. The hammer body is driven back to the rear end of the barrel with high pressure, so as to hit the rear end of the barrel with a large force, which is the fundamental cause of the vibration of the pneumatic tool.

In view of this, how to improve the above problem is the primary issue that this creation intends to solve.

The main purpose of this creation is to provide a pneumatic impact tool with a vibration-damping structure. The hammer body is provided with an exhaust channel that communicates with the front chamber of the inner pipe, and the air is continuously deflated at the beginning of the hammer body's retreat process, thereby directly weakening the The impact force of the hammer body back, thereby reducing vibration. Accordingly, the present invention produces the effect of vibration reduction without adding additional components.

In order to achieve the aforementioned purpose, the present invention provides a pneumatic impact tool with a vibration damping structure, which includes: a handle, which is provided with an alcove inside, the handle is provided with an air inlet channel connected to the alcove, wherein an air flow switch is arranged in the air inlet channel; A cylindrical piece accommodated in the recessed cavity, the cylindrical piece is provided with an air flow reversing valve, and a side wall of the cylindrical piece is provided with a through hole communicating with the air inlet passage, so that the high-pressure gas can be introduced into the air flow reversing valve ; An inner pipe includes a ring wall fixed on the cylinder 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. The airflow reversing valve and the airflow channel of the front chamber, the airflow channel forms a first air inlet in the front chamber, the rear chamber is provided with a second air inlet connected to the airflow reversing valve, the airflow The reversing valve can switch the air flow to be alternatively input into the front chamber from the first air inlet, or input into the rear chamber from the second air inlet; The 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 rear end, and is not connected to the rear chamber. When the high-pressure gas is injected into the rear chamber from the second air inlet, the hammer body is high-pressured 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. When the air passage communicates with the exhaust hole, the high-pressure gas in the front chamber is discharged through the exhaust passage and the exhaust hole, thereby reducing the force for pushing the hammer body.

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

Preferably, when the hammer body is in contact with the tool bit, the groove communicates with the exhaust hole. Further, the ring wall is provided with three exhaust holes, and the distances between the exhaust holes and the tool head are different respectively; when the hammer body is in a position in contact with the tool head, the groove is the closest to the tool head. The two exhaust holes of the tool head communicate with each other.

In another embodiment, the exhaust passage includes a communicating groove portion and a cylindrical gap, and the groove portion extends linearly to the head end along the moving direction of the hammer body and communicates with the front cavity. The cylindrical gap is formed by a band-shaped concave portion concave on the outer peripheral surface of the hammer body.

Preferably, when the hammer body is in contact with the tool head, the cylindrical gap communicates with the exhaust hole. Furthermore, the annular wall is provided with three exhaust holes, and the distances between the exhaust holes and the tool head are different respectively; when the hammer body is in a position in contact with the tool head, the cylindrical gap is connected to the two holes. The vent holes closest to the tool head communicate with each other.

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

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

Please refer to Figures 1 and 2, which show a first embodiment of a pneumatic impact tool with a vibration-damping structure provided for this creation, including a handle 1, a barrel 2, an inner tube 3 and a hammer 4 . The handle 1 can be in the shape of a pistol or a straight cylinder. In this embodiment, the handle 1 is in the shape of 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 channel 12 extending upward and communicating with the recess 11 for connecting to an external high-pressure gas supply source. The air intake passage 12 is provided with an air flow switch 13 for controlling the passage of air, and a button 14 is connected to the air flow switch 13 on one side of the handle 1 for operation.

The cylindrical member 2 of this embodiment is accommodated in the concave chamber 11 , and the bottom end of the concave chamber 11 is provided with a spring 15 for buffering the cylindrical member 2 . A through hole 21 communicated with the air inlet passage 12 is formed on the side wall of the cylindrical member 2, and a conventional airflow reversing valve 22 is arranged in the cylindrical member 2. After the high-pressure gas is introduced into the air inlet passage 12, it will pass through the air inlet passage 12. The through hole 21 enters the air flow reversing valve 22, and the air flow reversing valve 22 is used to output the high-pressure gas in two different paths.

The inner pipe member 3 is a round pipe structure with a ring wall 31 and a cavity 32 surrounded by the ring wall 31 , wherein the ring wall 31 extends into the cylinder member 2 and is fastened to the cylinder member 2 by threads The chamber 32 is provided with a hammer body 4 closely connected to the ring wall 31 , and the chamber 32 is further divided into a front chamber 321 and a rear chamber 322 . The inner pipe member 3 protrudes out of the cylinder member 2, and a tool head 5 is arranged at the front end thereof, and the tool head 5 can be replaced according to actual use requirements. The annular wall 31 is provided with an airflow channel 33 connected to the airflow reversing valve 22 in the interior of the annular wall 31 that is different from the chamber 32 , which forms a first air inlet 34 in the front chamber 321 ; and the rear chamber 322 A second air inlet 35 connected to the airflow reversing valve 22 is provided. Accordingly, the airflow reversing valve 22 can selectively output high-pressure gas to the airflow channel 33 at an appropriate time, and then inject the high-pressure gas into the front chamber 321 through the first air inlet 34; The second air inlet 35 is injected into the rear chamber 322 .

Furthermore, the annular wall 31 is provided with at least one exhaust hole 36 for connecting the chamber 32 to the outside; in this embodiment, the number of the exhaust holes 36 is three, which are along the axial direction of the inner pipe member 3 . Arranged in a straight line, the distances between the exhaust holes 36 and the tool head 5 are different. Further, 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 Half of the total length of the chamber 32 .

As shown in Figures 2 and 3, the hammer body 4 includes a head end 41 near the first air inlet 34 and a rear end 42 near the second air inlet 35, with an outer peripheral surface therebetween. 43 , the outer diameter of the hammer body 4 is equal to the inner diameter of the cavity 32 , so that the outer peripheral surface 43 is closely connected to the annular wall 31 . An exhaust passage is formed 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 rear end 42 , so the exhaust passage is not connected to the rear end 42 . The rear chamber 322 is communicated. In this embodiment, the exhaust passage is formed by a groove 44 recessed on the outer peripheral surface 43 , wherein the groove 44 extends in a spiral shape, and the number and pitch of the grooves 44 can be determined according to design requirements. be changed.

In this embodiment, the relative positional relationship between the groove 44 and the exhaust hole 36 is as shown in FIG. 4 . Specifically, when the hammer body 4 moves to the position where it contacts 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 and the high-pressure gas is introduced into the airflow reversing valve 22 through the intake passage 12 , the airflow reversing valve 22 first sends the high-pressure gas from the second air inlet 35 . When injected 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. Next, the air flow reversing valve 22 switches the air supply path, stops injecting high-pressure gas from the second air inlet 35 into the rear chamber 322, and instead introduces high-pressure air into the air passage 33, and then passes the first air inlet into the rear chamber 322. The air port 34 is injected into the front chamber 321 . As for the technology of switching the air supply path by the airflow reversing valve 22 , it is a common and conventional technology, and details are not repeated here.

At this time, the high pressure gas starts to push the hammer body 4 to move backward. As shown in FIG. 4 , when the hammer body 4 begins to leave the tool head 5 , the high-pressure gas in the front chamber 321 can begin to pass through the communication formed by the groove 44 and the exhaust hole 36 . The channel is vented all the way to the outside, reducing the pressure in the front chamber 321, thereby weakening the force of the hammer body 4 being pushed. Accordingly, when the hammer body 4 moves to the end of the stroke as shown in FIG. 6, the vibration caused by will decrease in magnitude.

In addition, in the process of vibration reduction in the present invention, when the hammer body 4 is at the starting point of the stroke as shown in FIG. 4, the groove 44 communicates with the exhaust hole 36, then the air can start to deflate at this time, in other words , the deflation timing of the present creation is much earlier than that of the conventional structure, so the force for pushing the hammer body 4 can be greatly weakened.

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

The feature of this creation is that at the source of the vibration of the pneumatic tool (that is, the impact force of the hammer body 4 retreating), the method of deflation directly weakens the impact force of the hammer body 4 retreating, so as to achieve the purpose of curing the root cause, it can produce more conventional The better vibration damping effect of the structure does not affect the force of the high-pressure gas driving the hammer body to strike the tool head, so the vibration damping effect can be produced under the premise of taking into account the output power of the pneumatic tool.

Figures 7 to 9 show the second embodiment of the invention, which is a pneumatic impact tool with the same structure as the previous embodiment, and the difference is the structure of the hammer body 9. Therefore, the structure of the previous embodiment will be added to the subsequent description.

The hammer body 9 also has a head end 91 and a tail end 92 as in the previous embodiment, and there is an outer peripheral surface 93 therebetween, and an exhaust channel is formed on the outer peripheral surface 93, wherein the exhaust channel is the same as the previous 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 rear end 92 , so that the exhaust passage does not communicate with the rear chamber 322 . In this embodiment, the exhaust passage 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 the groove portion 95 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 band-shaped concave portion 97 recessed from the outer peripheral surface 93 and the annular wall 31 .

Therefore, the relative positional relationship between the exhaust passage 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 .

Similar to the first embodiment, in this embodiment, when the hammer body 9 is at the starting point of the stroke as shown in FIG. 10, the air vent 36 is communicated through the cylindrical gap 96, and then the air can be deflated. In other words, the deflation timing is much earlier than the conventional structure. During the retreating process of the hammer body 9 , as shown in FIG. 11 , different exhaust holes 36 can be communicated through the cylindrical gap 96 to continuously deflate the air, and then, like the first embodiment, the hammer body 9 can be pushed back continuously to weaken. When the hammer body 9 reaches the end of the stroke as shown in Figure 12, the vibration is greatly reduced.

The disclosure of the above embodiments is only used to illustrate the present invention, not to limit the present invention, and the replacement of equivalent elements should still belong to the scope of the present invention.

To sum up, those skilled in the art can understand that this creation can indeed achieve the above-mentioned purpose, and it actually complies with the provisions of the Patent Law, and an application can be filed in accordance with the law.

1: Grip 11: Alcove 12: Intake channel 13: Airflow switch 14: Button 15: Spring 2: Cartridge 21: Through hole 22: Air flow reversing valve 3: Inner pipe fittings 31: Ring Wall 32: Chamber 321: Front Chamber 322: rear chamber 33: Air flow channel 34: First air intake 35: Second air intake 36: exhaust hole 4: Hammer body 41: head end 42: tail end 43: Outer peripheral surface 44: Groove 5: Tool head 9: Hammer body 91: head end 92: tail end 93: Peripheral surface 95: groove part 96: Cylindrical gap 97: Ribbon recess

Figure 1 is a schematic exploded perspective view of the first embodiment of the creation; Figure 2 is a schematic cross-sectional view of the entirety of the first embodiment of the creation; Figure 3 is a three-dimensional view of the hammer body according to the first embodiment of the creation; Figures 4 to 6 are schematic diagrams of the action states of the first embodiment of the creation; Fig. 7 is a three-dimensional exploded schematic diagram of the second embodiment of the creation; Figure 8 is a schematic cross-sectional view of the whole of the second embodiment of the creation; Figure 9 is a three-dimensional view of the hammer body according to the second embodiment of the creation; Figures 10 to 12 are schematic diagrams of operating states of the second embodiment of the invention.

1: Grip

11: Alcove

12: Intake channel

13: Airflow switch

14: Button

15: Spring

2: Cartridge

21: Through hole

22: Air flow reversing valve

3: Inner pipe fittings

31: Ring Wall

32: Chamber

321: Front Chamber

322: rear chamber

33: Air flow channel

34: First air intake

35: Second air intake

36: exhaust hole

4: Hammer body

41: head end

42: tail end

44: Groove

5: Tool head

Claims (10)

A pneumatic impact tool with a vibration-damping structure, comprising: a handle, which is provided with an alcove inside, the handle is provided with an air inlet channel connected to the alcove, wherein an air flow switch is arranged in the air inlet channel; A cylindrical piece accommodated in the recessed cavity, the cylindrical piece is provided with an air flow reversing valve, and a side wall of the cylindrical piece is provided with a through hole communicating with the air inlet passage, so that the high-pressure gas can be introduced into the air flow reversing valve ; An inner pipe includes a ring wall fixed on the cylinder 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. The airflow reversing valve and the airflow channel of the front chamber, the airflow channel forms a first air inlet in the front chamber, and the rear chamber is provided with a second air inlet connected to the airflow reversing valve, the airflow can be into the front chamber from the first air inlet, or into the rear chamber from the second air inlet; The 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 rear end, and is not connected to the rear chamber. When the high-pressure gas is injected into the rear chamber from the second air inlet, the hammer body is high-pressured 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 this process, when the exhaust passage communicates When the exhaust hole is used, the high-pressure gas in the front chamber is discharged through the exhaust passage and the exhaust hole, thereby reducing the force of the hammer body to be pushed. The pneumatic impact tool with a vibration damping structure as claimed in claim 1, wherein the exhaust passage is formed by a helical groove concave on the outer peripheral surface of the hammer body. The pneumatic impact tool with a vibration damping structure as claimed in claim 2, wherein when the hammer body is at a position in contact with the tool head, the groove communicates with the exhaust hole. The pneumatic impact tool with a vibration damping structure as claimed in claim 2, wherein the annular wall is provided with three exhaust holes, and the distances between the exhaust holes and the tool head are respectively different. The pneumatic impact tool with vibration damping structure as claimed in claim 4, wherein when the hammer body is in a position in contact with the tool head, the groove is connected to the two vent holes closest to the tool head connected. The pneumatic impact tool with a damping structure as claimed in claim 1, wherein the exhaust passage includes a groove portion and a cylindrical gap communicating with each other, and the groove portion is a straight line along the moving direction of the hammer body The cylindrical gap extends to the head end and communicates with the front chamber, and the cylindrical gap is the space between a band-shaped concave portion recessed on the outer peripheral surface of the hammer body and the annular wall. The pneumatic impact tool with a vibration damping structure as claimed in claim 6, wherein when the hammer body is at a position in contact with the tool head, the cylindrical gap communicates with the exhaust hole. The pneumatic impact tool with vibration damping structure as claimed in claim 6, wherein the annular wall is provided with three exhaust holes, and the distances between the exhaust holes and the tool head are respectively different. The pneumatic impact tool with a vibration damping structure as claimed in claim 8, wherein when the hammer body is at a position in contact with the tool head, the cylindrical gap is connected to the two exhaust gas closest to the tool head The holes are connected. The pneumatic impact tool with 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.

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