TWI730897B - Pneumatic impact tool - Google Patents

Abstract

A pneumatic impact tool includes a cylinder base unit, an air cylinder, a piston rod and a tool kit. The cylinder seat unit defines a first air chamber, an accommodating space, and an installation chamber. The cylinder has a second air chamber facing the first air chamber, a receiving groove facing the installation chamber, and a ring groove, and A stomata structure. Two opposite ends of the piston rod respectively extend into the second air chamber and the first air chamber, the piston rod slidably abuts against the inner wall surface of the cylinder, and the piston rod has an air inlet passage and a chamber And a hole structure, an air source forms an air flow flowing from the first air chamber into the air inlet channel, and the air flow is used to push the piston rod to move. The piston rod can reciprocate between a pneumatic state and an exhaust state relative to the cylinder, and link an impact part of the tool kit to generate an impact force.

Description

Pneumatic impact tool

The present invention relates to a pneumatic impact tool, in particular to a pneumatic impact tool used to remove surface substances.

Referring to Fig. 1, an existing pneumatic rust removal gun inserts several steel needles 91 into a needle seat 92 at the front end in a bundle, and uses high-pressure gas to push a piston 93 to reciprocate in a cylinder 94, and the piston 93 hits a needle seat 92. The impact block 95 then impacts the needle base 92 by the impact block 95, and causes the steel needles 91 to generate an impact force, thereby removing the rust or surface material of the object.

However, when the pneumatic rust removal gun is in use, the piston 93 hits the impact block 95 and generates continuous vibration, which causes discomfort to the operator's hand. In order to reduce the vibration generated by the impact, the industry will use the pneumatic rust removal gun A rubber pad (not shown in the figure) is installed in the internal space to absorb shock. Although it can reduce the degree of vibration, the shock absorption effect is limited and there is still room for improvement.

Therefore, the purpose of the present invention is to provide a device that can effectively reduce vibration Pneumatic impact tool.

Therefore, the pneumatic impact tool of the present invention is suitable for connecting an air source. The pneumatic impact tool includes a cylinder base unit, an air cylinder, a piston rod, a tool kit, and an elastic member.

The cylinder base unit surrounds an axis and defines a first air chamber, an accommodating space, and an installation chamber that are communicated with each other, and the first air chamber and the installation chamber are located at two opposite ends of the accommodating space along the axis, The barrel base unit also has an air inlet for connecting the air source. The cylinder is movably disposed in the accommodating space along the axis. The cylinder includes a ring wall surrounding the axis and a connecting wall. The axis passes through the connecting wall. The ring wall cooperates with the connecting wall to define a A second air chamber facing the first air chamber, and a pocket facing the installation chamber, the second air chamber is substantially not directly connected to the pocket, and the inner wall of the ring wall has a surface around the axis and An annular groove formed in the second air chamber, and an air hole structure respectively used to communicate with the second air chamber, the accommodating space and the containing groove.

The piston rod is telescopically arranged on the cylinder and the barrel seat unit, two opposite ends of the piston rod respectively extend into the second air chamber and the first air chamber, and the piston rod slidably abuts against the cylinder The piston rod has an air inlet passage extending along the axis and communicating with the first air chamber, a chamber communicating with the second air chamber, and a hole structure. The air inlet passage is substantially It is not directly connected to the chamber, and the pore structures are respectively opened to the outside and the air inlet passage and the chamber. The air source enters the air inlet and forms a flow from the first air chamber into the air inlet passage. Air flow, which is used to push the piston rod toward the The direction of the container moves. The tool kit is detachably arranged in the cavity of the cylinder, and the tool kit has an impact part exposed outside the barrel base unit. The elastic member can be compressed and arranged in the installation chamber and used to generate a potential energy of an elastic force that constantly pushes the tool kit to move in the direction of the piston rod.

The piston rod can reciprocate with respect to the cylinder between a pneumatic state and an exhaust state and link the impact part to generate an impact force. In the pneumatic state, the hole structures communicate with the ring groove, and the air flow enters The second air chamber is pressurized to generate an air that makes the piston rod and the cylinder move in the opposite direction, thereby causing the tool kit to be driven by the cylinder and compress the elastic member. In the exhaust state, The chamber is communicated with the chamber through the pore structures, so that the airflow flows out of the chamber to be exhausted, and the elastic member releases the potential energy.

The effect of the present invention is that the air in the first air chamber and the second air chamber can absorb the impact force and can buffer the vibration caused by the reciprocating movement of the piston rod in the cylinder, and the shock absorption effect is better, which can effectively reduce Vibration, so it is more comfortable to use.

1: Cylinder base unit

100: accommodating space

101: first air chamber

102: installation room

103: second air chamber

104: Tolerance

11: Handle tube seat

111: Seat

112: Air Cap

113: External thread

114: air inlet

115: valve port

116: Lid

117: Airtight inner ring

118: Airtight outer ring

119: limit buckle

12: Main tube seat

121: Internal thread

122: External thread

13: Front tube seat

131: Installation Department

133: Containment Department

134: Stop

14: The first washer

15: second washer

2: Operation unit

21: Air valve group

211: Valve

212: plug

213: Tower spring

214: Washer

22: Pressing parts

3: Cylinder

31: Ring Wall

310: Stomatal structure

311: ring groove

312: vent hole

313: Into the Stoma

32: connecting wall

4: Piston rod

40: Hole structure

41: First path section

42: The second diameter section

43: intake channel

44: Room

45: Piercing

46: Through hole

47: Through hole

5: Tool kit

51: Needle seat

52: Metal bead needle

521: Shock Department

6: Elastic parts

8: Air source

X: axis

I: Airflow

Other features and effects of the present invention will be clearly presented in the embodiment with reference to the drawings, in which: Figure 1 is a cross-sectional view of an existing pneumatic rust removal gun; Figure 2 is the first implementation of the pneumatic impact tool of the present invention Example for a gas source connection Figure 3 is a perspective exploded view of the first embodiment; Figure 4 is an incomplete cross-sectional schematic view of the first embodiment, illustrating that a pressing member of the first embodiment pushes a valve, and a The piston rod is in a pneumatic state relative to a cylinder; Figure 5 is a view similar to Figure 4, illustrating that the pressing member has not yet pushed the air valve, and an air inlet of a cylinder seat unit is not in communication with a first air chamber Figure 6 is a perspective cross-sectional view of the cylinder; Figure 7 is a perspective cross-sectional view of the piston rod; Figure 8 is a cross-sectional view taken along the line VIII-VIII in Figure 4, illustrating a hole structure of the piston rod and A ring groove of the cylinder is connected; Figure 9 is an incomplete cross-sectional view of the first embodiment, illustrating that the piston rod is in the pneumatic state relative to the cylinder and an elastic member is compressed; Figure 10 is a diagram similar to Figure 9 Figure 11 is a view similar to Figure 10, illustrating that the piston rod moves to an exhaust state relative to the cylinder; Figure 12 is the first pneumatic impact tool of the present invention A perspective view of the second embodiment; and FIG. 13 is a perspective view of the third embodiment of the pneumatic impact tool of the present invention.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same numbers.

2 to 4, the first embodiment of the pneumatic impact tool of the present invention is suitable for connecting an air source 8 which is a kind of compressed air. The pneumatic impact tool includes a cylinder base unit 1, an operating unit 2, a cylinder 3, a piston rod 4, a tool set 5 and an elastic member 6. In the first embodiment, a straight pneumatic rust remover is used as an illustration. The pneumatic rust remover can be used to remove rust, glue, paint or other surface materials.

The cylinder base unit 1 surrounds an axis X and defines a first air chamber 101, an accommodating space 100, and an installation chamber 102 that are communicated with each other. The first air chamber 101 and the installation chamber 102 are located along the axis X. Two opposite ends of the accommodating space 100. The barrel base unit 1 of the first embodiment includes a handle barrel base 11, a main barrel base 12 rotatably screwed to the handle barrel base 11, and a front of the main barrel base 12 rotatably screwed. The barrel base 13, preferably, the barrel base unit 1 further includes a first gasket 14 arranged between the handle barrel base 11 and the main barrel base 12, and a first gasket 14 arranged between the main barrel base 12 and the front barrel base The second washer 15 between 13, the first washer 14 and the second washer 15 are respectively a flexible O-ring, and the handle barrel base 11 and the main barrel base 12 will be squeezed when screwed The first gasket 14 can improve the airtightness. Similarly, the second gasket 15 is provided between the main cylinder base 12 and the front cylinder base 13 to improve the airtightness.

3 to 5, preferably, the handle barrel base 11 has a seat 111 And an air cover 112, the first air chamber 101 is surrounded and defined by the base 111 and the air cover 112. The seat body 111 has an external thread portion 113 formed on the outer surface, an air inlet 114 suitable for connecting the air source 8, and a valve port 115 that opens to the outside and communicates with the first air chamber 101. The inlet The air port 114 communicates with the first air chamber 101 via the valve port 115. The air cover 112 has a cover 116, an airtight inner ring 117, an airtight outer ring 118, and a limit retaining ring 119. The airtight inner ring 117 is a flexible O-ring and is embedded in The cover 116 and the airtight outer ring 118 are a flexible O-ring and are embedded between the cover 116 and the seat 111, thereby improving the airtightness. The limiting buckle 119 is embedded in the inner surface of the base 111 of the handle barrel base 11 and is used for the cover 116 to abut against, so that the cover 116 is positioned on the base 111 without detaching. The limiting buckle 119 of the first embodiment is a flat-material C-shaped buckle, but it can also be replaced by other equivalent elements.

The main barrel base 12 is hollow and tubular and surrounds the axis X and defines the accommodating space 100. The main barrel base 12 has an internal threaded portion 121 for screwing on the outer threaded portion 113 of the handle barrel base 11, and An external threaded portion 122 adjacent to the front barrel base 13. The front tube seat 13 has a hollow tube shape and both ends are open. The front tube seat 13 surrounds the axis X and forms the mounting chamber 102. The mounting chamber 102 has a mounting portion 131 and a receiving portion arranged in sequence. 133 and a stopping portion 134, the mounting portion 131 has internal threads, the inner diameter of the accommodating portion 133 is smaller than the inner diameter of the mounting portion 131, and the inner diameter of the stopping portion 134 is smaller than the inner diameter of the accommodating portion 133, The external threaded portion 122 of the main cylinder seat 12 is detachably screwed to the mounting portion 131 and abuts against the accommodating portion 133.

The operating unit 2 is operably disposed on the barrel seat unit 1, and the operating unit 2 includes an air valve group 21 movably installed on the valve port 115, and a presser set movably on the handle barrel seat 11 The pressing member 22 is used to push the air valve group 21 to open or block the valve port 115 and the air inlet 114, thereby controlling the opening or closing between the air inlet 114 and the first air chamber 101 As shown in FIG. 5, when the pressing member 22 is not pressed, the air inlet 114 and the first air chamber 101 are in a closed state without communication. In detail, the air valve assembly 21 has an air valve 211 movably installed on the valve port 115, a plug 212 detachably inserted through the seat body 111 of the handle barrel seat 11, and a plug member 212 that can be movably installed on the valve port 115. A tower spring 213 compressed between the plug 212 and the air valve 211, and two washers 214 sleeved on the outer surface of the air valve 211. The tower spring 213 is used to provide a potential energy to constantly push the air valve 211 toward the pressing member 22, so that the air valve 211 can be pushed to reset when the pressing member 22 is released. The gaskets 214 can improve the air tightness of the valve 211 and the valve port 115. As shown in FIG. 4, when the pressing member 22 is pressed, the pressing member 22 pushes the air valve 211 to move and squeezes the tower spring 213, so that the air inlet 114 passes through the valve port 115 and the first air chamber 101 is in communication. At this time, the air inlet 114 and the first air chamber 101 are in an open state of communication.

3, 4 and 6, the cylinder 3 is movably disposed in the accommodating space 100 along the axis X. The cylinder 3 includes an annular wall 31 surrounding the axis X and a connecting wall 32. The axis X substantially perpendicularly passes through the connecting wall 32, and the ring wall 31 is connected to the connecting wall The wall 32 cooperates to define a second air chamber 103 facing the first air chamber 101, and a receiving groove 104 facing the installation chamber 102, and the second air chamber 103 is substantially not directly connected to the receiving groove 104 . The ring wall 31 has a ring groove 311, at least one air outlet 312, and at least one air inlet 313. In the first embodiment, the number of the air outlet 312 is four, and the number of the air inlet 313 is six, but the number may vary depending on The actual demand is adjusted. The aperture of each air inlet 313 is smaller than the aperture of each air outlet 312. Preferably, the air outlets 312 are located in the circumferential direction around the axis X and are angularly offset from each other, and the air inlets 313 are located at It is angularly offset from each other in the circumferential direction around the axis X. The ring groove 311 surrounds the axis X and forms an inner wall surface and is located in the second air chamber 103, and the ring groove 311 is farther away from the receiving groove 104 than the air outlet holes 312. The air outlets 312 are connected to the second air chamber 103 and the accommodating space 100, and the air inlets 313 are connected to the accommodating groove 104 and the accommodating space 100. The first embodiment uses the air outlets 312 and the accommodating space 100. The air inlet holes 313 are used as the air hole structure 310 for connecting the second air chamber 103, the accommodating space 100 and the container 104, but the number, arrangement positions and distribution angles of the air outlet 312 and the air inlet 313 It is not a limitation of this case.

4, 7 and 8, the piston rod 4 is telescopically arranged on the cylinder 3 and the air cap 112 of the cylinder base unit 1, and two opposite ends of the piston rod 4 respectively extend into the second air chamber 103 With the first air chamber 101. The piston rod 4 slidably abuts against the inner wall surface of the cylinder 3. The piston rod 4 has a first diameter section 41 and a second diameter section 42 having an outer diameter larger than that of the first diameter section 41 , The first diameter section 41 penetrates the airtightness of the cover 116 The inner ring 117 extends into the first air chamber 101, and the second diameter section 42 slidably abuts against the cylinder 3. The piston rod 4 also has an air intake passage 43 located inside and extending from the first diameter section 41 to the second diameter section 42 along the axis X, and an intake passage 43 located on the second diameter section 42 and connected to the second air chamber. 103 communicated with the chamber 44, at least one through hole 45, at least one through hole 46, and at least one through hole 47, the air inlet passage 43 is connected to the first air chamber 101, and the air inlet passage 43 is substantially connected to the chamber 44 Not directly connected. As shown in FIG. 8, the numbers of the through holes 45, the through holes 46, and the through holes 47 are two respectively. The through holes 45 and the through holes 46 are radial holes and are located in the circumferential direction around the axis X , And staggered from each other in angle. The through holes 45 are opened to the outside and the air inlet passage 43, the through holes 46 are opened to the outside and the chamber 44, and the through holes 47 are axial holes that open in the chamber 44 and extend to the chambers 44, respectively. The through holes 46 use the through holes 45, the through holes 46 and the through holes 47 as the hole structure 40 that opens to the outside and the air inlet passage 43 and the chamber 44.

Referring to Figures 3 and 4, the tool kit 5 is detachably installed in the pocket 104 of the cylinder 3. The tool kit 5 of the first embodiment is a metal needle bundle, and the tool kit 6 includes a The needle holder 51 of the pocket 104 of the cylinder 3 and the metal ball needles 52 movably arranged on the needle holder 51. The front end of the metal ball needles 52 defines an impact part exposed to the cylinder base unit 1 521. It should be noted that the metal bead needles 52 are installed in the needle base 51 in a loose-fitting manner. Therefore, there is a slight gap between the metal bead needles 52 and the needle base 51, so that the metal The bead needle 52 has freedom of movement.

The elastic member 6 is located in the installation chamber 102 and can be compressed and arranged between the front cylinder seat 13 and the needle seat 51, and both ends of the elastic member 6 elastically abut against the needle seat 51 and the installation chamber 102 respectively. The stop portion 134, the elastic member 6 is a cylindrical spiral compression spring and is used to generate a potential energy of an elastic force that constantly pushes the tool set 5 to move in the direction of the piston rod 4.

2 and 4, pressing the pressing member 22 and making the air inlet 114 communicate with the first air chamber 101, the air source 8 enters the air inlet 114 and forms an inflow from the first air chamber 101 The airflow I of the air intake passage 43 is used to push the piston rod 4 to move toward the receiving groove 104.

4 and 11, the piston rod 4 can reciprocate relative to the cylinder 3 between a pneumatic state (Figure 4) and an exhaust state (Figure 11) by the action of the air flow I and link the The impact part 521 generates impact force.

4 and 8, in the pneumatic state, the perforations 45 of the hole structure 40 communicate with the annular groove 311, so that the airflow I follows the perforations 45, the annular groove 311, and the through holes 46. The accommodating chamber 44 flows into the second air chamber 103 to pressurize to generate an air force that makes the piston rod 4 and the cylinder 3 move in opposite directions.

As shown in FIG. 9, the air generated in the pneumatic state will cause the tool set 5 to be driven by the cylinder 3 to move downward and compress the elastic member 6, and the elastic member 6 accumulates the potential energy. In particular, when the cylinder 3 moves to the lowest point, it will not hit the accommodating portion 133 of the front cylinder seat 13, and therefore, no impact force will be generated. But if the cylinder 3 If the cylinder 3 continues to move downwards accidentally, the bottom surface of the cylinder 3 will also be blocked by the accommodating portion 133 to prevent the cylinder 3 from escaping from the piston rod 4 and losing its function.

10 and 11, as shown in FIG. 10, when the cylinder 3 and the piston rod 4 are far away from each other until the bottom side of the piston rod 4 opens to the air outlet holes 312 of the cylinder 3, the second air chamber The chamber 103 and the chamber 44 gradually communicate with the air outlet 312 of the air hole structure 310, but the elastic member 6 is still compressed and the potential energy has not yet been released at the moment. As shown in FIG. 11, the piston rod 4 moves relative to the cylinder 3 to the exhaust state, and the air flow I can flow from the second air chamber 103 along the outlet holes 312, the accommodating space 100, and the inlets. After the air hole 313 flows into the receiving groove 104, it is exhausted to the outside through the gap between the metal ball needle 52 and the needle seat 51. The pressure in the second air chamber 103 drops and the elastic member 6 releases the potential energy to remove The cylinder 3 is pushed up. On the other hand, the compressed air that continues to enter the air inlet 114 (see FIG. 4) will also enter the first air chamber 101 again to push down the piston rod 4, push up the cylinder 3 and push down the piston rod. The two forces of 4 will cause the piston rod 4 and the cylinder 3 to approach again and return to the pneumatic state. Therefore, as long as the air intake is continued, the piston rod 4 can be caused to produce repeated reciprocating motions between the pneumatic state and the exhaust state relative to the cylinder 3, so that the impact portion 521 of the tool set 5 can continuously generate an impact. It can be used to remove rust, glue or paint.

In the first embodiment, the first air chamber 101 and the second air chamber 103 are provided at opposite ends of the piston rod 4 for reciprocating motion, and the air in the first air chamber 101 and the second air chamber 103 is used. Absorb impact force, can cushion the piston rod 4 from moving in the cylinder 3 The vibration caused by the repeated movement, therefore, the shock absorption effect is better, the vibration can be effectively reduced, and the hand is more comfortable when used. In addition, since the first embodiment provides the air hole structure 310 and the hole structure 40 on the cylinder 3 and the piston rod 4, respectively, the traveling direction of the airflow I is changed, thereby promoting the cylinder 3 and the piston rod. With the reciprocating movement of 4, the first embodiment has a simple structure and a small number of components. Therefore, the assembly and disassembly method is relatively simple, and the overall volume can be further reduced, which is convenient for the operator to hold and use.

Refer to Figure 12, which is a second embodiment of the pneumatic impact tool of the present invention, which is a gun-type pneumatic rust remover. This second embodiment is similar to the first embodiment. The main difference lies in the operation The pressing member 22 of the unit 2 is a gun-shaped grip, which is convenient for the operator to hold. The second embodiment has the same effect as the first embodiment.

Refer to FIG. 13, which is a third embodiment of the pneumatic impact tool of the present invention. The third embodiment is similar to the first embodiment. The main difference is that the tool set 5 is a chisel, which can be used to remove With a larger surface area, the third embodiment has the same effect as the first embodiment.

To sum up, the pneumatic impact tool of the present invention uses the air in the first air chamber 101 and the second air chamber 103 to buffer the vibration caused by the reciprocating movement of the piston rod 4, and the shock absorption effect is better and can be effective. The vibration is reduced, so it is more comfortable to use, so it can indeed achieve the purpose of the invention.

However, the above are only examples of the present invention. To limit the scope of implementation of the present invention, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still fall within the scope of the patent of the present invention.

1: Cylinder base unit

100: accommodating space

101: first air chamber

102: installation room

103: second air chamber

104: Tolerance

11: Handle tube seat

111: Seat

112: Air Cap

114: air inlet

115: valve port

117: Airtight inner ring

119: limit buckle

12: Main tube seat

13: Front tube seat

131: Installation Department

133: Containment Department

134: Stop

14: The first washer

15: second washer

2: Operation unit

21: Air valve group

211: Valve

212: plug

213: Tower spring

214: Washer

22: Pressing parts

3: Cylinder

310: Stomatal structure

311: ring groove

312: vent hole

313: Into the Air Hole

4: Piston rod

40: Hole structure

41: First path section

42: The second diameter section

43: intake channel

44: Room

45: Piercing

5: Tool kit

51: Needle seat

52: Metal bead needle

6: Elastic parts

X: axis

I: Airflow

Claims (10)

A pneumatic impact tool is suitable for connecting an air source. The pneumatic impact tool includes: a cylinder base unit that surrounds an axis and defines a communicating first air chamber, an accommodating space, and an installation chamber. The first The air chamber and the installation chamber are located at two opposite ends of the accommodating space along the axis. The cylinder base unit also has an air inlet for connecting the air source; a cylinder movably arranged in the housing along the axis. In the set space, the cylinder includes a ring wall surrounding the axis and a connecting wall, the axis passes through the connecting wall, and the ring wall cooperates with the connecting wall to define a second air chamber facing the first air chamber, And a pocket facing the installation chamber, the second air chamber is not substantially directly connected with the pocket, the inner wall of the ring wall has a ring groove around the axis and formed in the second air chamber, and An air hole structure respectively used to communicate with the second air chamber, the accommodating space and the accommodating groove; a piston rod is telescopically arranged on the cylinder and the barrel base unit, and two opposite ends of the piston rod respectively extend Into the second air chamber and the first air chamber, the piston rod slidably abuts against the inner wall surface of the cylinder, and the piston rod has an air intake passage extending along the axis and communicating with the first air chamber , A chamber communicating with the second air chamber, and a hole structure, the air inlet passage is not directly connected with the chamber, the hole structures are opened to the outside and the air inlet passage and the chamber respectively The air source enters the air inlet and forms an air flow flowing from the first air chamber into the air inlet channel, and the air flow is used to push the piston rod to move in the direction of the receiving groove; a tool kit, removable Set in the pocket of the cylinder, the tool The kit has an impact part exposed on the barrel base unit; and an elastic member, which can be compressed and arranged in the installation chamber and used to generate a potential energy of an elastic force that constantly pushes the tool kit to move in the direction of the piston rod, The piston rod can reciprocate with respect to the cylinder between a pneumatic state and an exhaust state and link the impact part to generate an impact force. In the pneumatic state, the hole structures communicate with the ring groove, and the air flow enters The second air chamber is pressurized to generate an air that makes the piston rod and the cylinder move in the opposite direction, thereby causing the tool kit to be driven by the cylinder and compress the elastic member. In the exhaust state, The chamber is communicated with the chamber through the pore structures, so that the airflow flows out of the chamber to be exhausted, and the elastic member releases the potential energy. The pneumatic impact tool according to claim 1, wherein the air hole structure of the cylinder has at least one air outlet and at least one air inlet, the air outlet communicates with the second air chamber and the accommodating space, and the air inlet communicates with The containing slot and the containing space. The pneumatic impact tool according to claim 2, wherein the ring groove is farther away from the pocket than the air outlet. The pneumatic impact tool according to claim 1, wherein the hole structure of the piston rod has at least one through hole and at least one through hole, and the through hole and the through hole are located in a circumferential direction around the axis and are angularly staggered from each other The perforation is opened to the outside and the air inlet passage, and the through hole is opened to the outside and the chamber. The pneumatic impact tool according to claim 4, wherein the hole structure of the piston rod further has at least one through hole, the through hole opens in the chamber and extends to the through hole hole. The pneumatic impact tool according to claim 1, wherein the barrel base unit includes a handle barrel base, a main barrel base rotatably screwed to the handle barrel base, and a rotatably screwed to the main barrel base A front tube seat, the handle tube seat is formed with the air inlet and the first air chamber, the main tube seat is formed with the accommodating space, and the front tube seat is formed with the installation chamber. The pneumatic impact tool according to claim 6, wherein the barrel base unit further includes a first washer provided between the handle barrel base and the main barrel base, and a first gasket provided between the main barrel base and the front barrel base The second washer. The pneumatic impact tool according to claim 6, wherein the handle barrel seat has a seat body and an air cover, the first air chamber is surrounded by the seat body and the air cover, and the piston rod is movably inserted through The air cap. The pneumatic impact tool according to claim 8, wherein the air cover has a cover body, an airtight inner ring and an airtight outer ring, the cover body is movably penetrated by the piston rod, and the airtight inner ring is embedded It is arranged between the cover body and the piston rod, and the airtight outer ring is embedded between the cover body and the seat body. The pneumatic impact tool according to claim 6, further comprising an operating unit, the operating unit including an air valve for blocking the air inlet and the first air chamber, and a pressable set on the handle barrel seat The pressing member is used to push the air valve.

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