TW202210246A - Pneumatic impact tool relieves the vibration caused by the reciprocation movement of piston stem in gas cylinder by using the air suction impact force in first gas chamber and second gas chamber - Google Patents

Abstract

A pneumatic impact tool comprises a sleeve seat unit, a pneumatic cylinder, a piston stem, and a tool kit. The sleeve seat unit defines a first gas chamber, an accommodation space, and a mounting chamber. The gas cylinder has a second gas chamber toward the first gas chamber, an accommodation groove toward the mounting chamber, a ring groove, and an air hole structure. Two reversed ends of the piston stem respectively stretch into the second gas chamber and the first gas chamber. The piston stem can slideably lean against an inner wall surface of the gas cylinder. The piston stem has an air intake channel, a containing chamber, and a hole structure. A gas source is formed into airstream flowing into the air intake channel from the first gas chamber. The airstream is used for pushing the piston stem to move. The piston stem, which is relative to the gas cylinder, can perform a reciprocating movement between a pneumatic state and an air discharge state and link to an impact portion 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 for removing surface substances.

Referring to FIG. 1, an existing pneumatic rust removal gun inserts several steel needles 91 in bundles on a needle seat 92 at the front end, and uses high-pressure gas to push a piston 93 to reciprocate in a cylinder 94, and the piston 93 strikes a The impact block 95, and then the impact block 95 hits the needle base 92, and makes the steel needles 91 generate 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 will collide with the impact block 95 to generate continuous vibration, which will cause discomfort to the operator's hand. A rubber pad (not shown in the figure) is set in the inner space of the fuselage to absorb shock. Although the degree of vibration can be reduced, the shock absorption effect is limited, and there is still room for improvement.

Therefore, the object of the present invention is to provide a pneumatic impact tool that can effectively reduce vibration.

Therefore, the pneumatic impact tool of the present invention is suitable for connecting to an air source, and the pneumatic impact tool includes a cylinder seat unit, a cylinder, a piston rod, a tool set 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 communicate with each other. The first air chamber and the installation chamber are located at opposite ends of the accommodating space along the axis. The cartridge base unit also has an air inlet for connecting to 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, and the ring wall cooperates with the connecting wall to define a A second air chamber facing the first air chamber, and a receiving groove facing the installation chamber, the second air chamber is substantially not in direct communication with the receiving groove, and the inner wall surface of the ring wall has a circumference around the axis and An annular groove is formed in the second air chamber, and an air hole structure is respectively used to communicate with the second air chamber, the accommodating space and the accommodating groove.

The piston rod is telescopically arranged on the cylinder and the cylinder base unit, two opposite ends of the piston rod extend into the second air chamber and the first air chamber respectively, and the piston rod is slidably abutted against the cylinder The inner wall surface of the piston rod has an 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 intake passage is substantially Not directly communicated with the chamber, the hole structures are respectively open to the outside, the air inlet channel and the chamber, the air source enters the air inlet and forms a flow from the first air chamber into the air inlet channel. Air flow, the air flow is used to push the piston rod to move in the direction of the receptacle. The tool set is detachably arranged in the accommodating groove of the air cylinder, and the tool set has an impact part exposed to the cylinder seat unit. The elastic member can be compressively disposed in the installation chamber and used to generate an elastic force that constantly pushes the tool set to move in the direction of the piston rod.

The piston rod can reciprocate relative to the cylinder between an aerodynamic state and an exhaust state, and is linked to the impact portion to generate impact force. In the aerodynamic state, the hole structures are communicated with the annular groove, and the airflow enters The second air chamber is pressurized to generate an air force that causes the piston rod and the cylinder to move in the opposite direction, so that the tool set is driven by the cylinder and compresses the elastic member. In the exhaust state, The accommodating chamber is communicated with the accommodating tank through the air hole structures, so that the airflow flows out of the accommodating tank for exhausting, and the elastic member releases the potential energy.

The effect of the present invention lies in: using the air in the first air chamber and the second air chamber to absorb the impact force, the vibration caused by the reciprocating movement of the piston rod in the cylinder can be buffered, and the shock absorption effect is better, which can effectively reduce the Vibration, therefore, is more comfortable to use.

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

Referring to FIGS. 2 to 4 , the first embodiment of the pneumatic impact tool of the present invention is suitable for connecting to an air source 8 , and the air source 8 is a compressed air. The pneumatic impact tool includes a cylinder seat unit 1 , an operating unit 2 , an air cylinder 3 , a piston rod 4 , a tool set 5 and an elastic member 6 . The first embodiment is described with a straight-type pneumatic rust remover, which can be used to remove rust, glue, paint or other surface substances.

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 communicate with each other. The first air chamber 101 and the installation chamber 102 are located along the axis X in the Two opposite ends of the accommodating space 100 are accommodated. The cylinder base unit 1 of the first embodiment includes a handle base 11 , a main cylinder base 12 rotatably screwed to the handle cylinder base 11 , and a front surface rotatably screwed to the main cylinder base 12 . The cylinder base 13, preferably, the cylinder base unit 1 further includes a first washer 14 disposed between the handle cylinder base 11 and the main cylinder base 12, and a first washer 14 disposed between the main cylinder base 12 and the front cylinder base The second washer 15 between 13, the first washer 14 and the second washer 15 are respectively a flexible O-ring, which is squeezed when the handle barrel seat 11 is screwed with the main barrel seat 12 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.

Referring to FIGS. 3 to 5 , preferably, the handle holder 11 has a base 111 and an air cover 112 , and the first air chamber 101 is 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 to the air source 8 , and a valve port 115 open to the outside and communicating with the first air chamber 101 . The air port 114 communicates with the first air chamber 101 via the valve port 115 . The air cover 112 has a cover body 116 , an air-tight inner ring 117 , an air-tight outer ring 118 , and a limit ring 119 . The air-tight inner ring 117 is a flexible O-ring and is embedded in the The cover body 116 and the airtight outer ring 118 are flexible O-rings and are embedded between the cover body 116 and the base body 111 , thereby improving airtightness. The retaining ring 119 is embedded in the inner surface of the seat body 111 of the handle holder 11 and is used for the cover body 116 to abut against, so that the cover body 116 is positioned on the seat body 111 without being detached. The retaining ring 119 of the first embodiment is a flat C-shaped buckle, but other equivalent elements can also be used instead.

The main cylinder seat 12 is in the shape of a hollow tube and surrounds the axis X and defines the accommodating space 100 , the main cylinder seat 12 has an inner thread portion 121 for screwing the outer thread portion 113 of the handle cylinder seat 11 , and An external thread portion 122 adjacent to the front barrel seat 13 . The front cylinder seat 13 has a hollow tubular shape with open ends. The front cylinder seat 13 surrounds the axis X and forms the installation chamber 102 . The installation chamber 102 has an installation portion 131 and an accommodating portion arranged in sequence. 133 and a blocking portion 134, the mounting portion 131 has an internal thread, 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 blocking portion 134 is smaller than the inner diameter of the accommodating portion 133, The external thread 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 cylinder seat unit 1 , and the operating unit 2 includes an air valve group 21 movably installed on the valve port 115 , and a presser 21 movably installed 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 in which they do not communicate with each other. In detail, the air valve group 21 has an air valve 211 that can be installed in the valve port 115 in a translational manner, a plug 212 that can be detachably penetrated through the seat body 111 of the handle holder 11 , and can be A tower spring 213 compressively disposed between the plug 212 and the air valve 211 , and two gaskets 214 sleeved on the outer surface of the air valve 211 . The tower spring 213 is used to provide a potential energy that constantly pushes the air valve 211 to move in the direction of the pressing member 22 , so that when the pressing member 22 is released, the air valve 211 can be pushed back to reset. The gaskets 214 can improve the air tightness between the air 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 communicates with the first air chamber through the valve port 115 101 is connected, and 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 a ring wall 31 and a connecting wall 32 surrounding the axis X, the axis X passes through the connecting wall 32 substantially vertically. The annular wall 31 cooperates with the connecting wall 32 to define a second air chamber 103 facing the first air chamber 101 and a receiving groove 104 facing the installation chamber 102. The second air chamber 103 is substantially not in direct communication with the container 104 . The annular wall 31 has an annular groove 311, at least one air outlet hole 312 and at least one air inlet hole 313. In the first embodiment, the number of the air outlet holes 312 is four, and the number of the air inlet holes 313 is six, but the number can be determined according to Adjust according to actual needs. The diameter of each air inlet hole 313 is smaller than that of each air outlet hole 312. Preferably, the air outlet holes 312 are located in the circumferential direction around the axis X and are angularly staggered from each other, and the air inlet holes 313 are located at Circumferentially and angularly offset from each other around the axis X. The annular groove 311 surrounds the axis X and forms an inner wall surface and is located in the second air chamber 103 , and the annular groove 311 is further away from the accommodating groove 104 than the air outlet holes 312 . The air outlet holes 312 communicate with the second air chamber 103 and the accommodating space 100 , and the air inlet holes 313 communicate with the accommodating groove 104 and the accommodating space 100 . The first embodiment utilizes the air outlet holes 312 and the accommodating space 100 . The air inlet holes 313 are used as the air hole structure 310 for communicating the second air chamber 103 , the accommodating space 100 and the accommodating groove 104 , but the number, arrangement position and distribution angle of the air outlet holes 312 and the air inlet holes 313 Not a limitation in this case.

Referring to FIG. 4 , FIG. 7 and FIG. 8 , the piston rod 4 is telescopically disposed on the air cover 112 of the cylinder 3 and 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 is slidably abutted 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 whose outer diameter is larger than that of the first diameter section 41 . , the first diameter section 41 penetrates behind the airtight inner ring 117 of the cover body 116 and extends into the first air chamber 101 , and the second diameter section 42 is slidably abutted against the cylinder 3 . The piston rod 4 also has an 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 channel 43 located at the second diameter section 42 and connected to the second air chamber The accommodating chamber 44, at least one through hole 45, at least one through hole 46, and at least one through hole 47 communicated with 103, the air inlet passage 43 is communicated with the first air chamber 101, and the air inlet passage 43 is substantially connected to the accommodating chamber 44 not directly connected. As shown in FIG. 8 , the number of the through holes 45 , the through holes 46 and the through holes 47 is two respectively, and the through holes 45 and the through holes 46 are radial holes and are located in the circumferential direction around the axis X , and are angularly staggered from each other. The through holes 45 open to the outside and the air intake passage 43, the through holes 46 open to the outside and the chamber 44, the through holes 47 are axial holes and open to the chamber 44 and extend to the The through-holes 46 use the through-holes 45 , the through-holes 46 and the through-holes 47 as the hole structure 40 opening to the outside, the air inlet channel 43 and the chamber 44 .

Referring to FIGS. 3 and 4 , the tool set 5 is detachably disposed in the cavity 104 of the air cylinder 3 , the tool set 5 of the first embodiment is a metal needle bundle, and the tool set 6 includes a The needle seat 51 of the groove 104 of the cylinder 3 and the metal ball needles 52 movably arranged on the needle seat 51, the front end of the metal ball needles 52 defines an impact portion exposed to the cylinder seat unit 1 521, it should be noted that the metal ball needles 52 are installed on the needle seat 51 in a loose fit, so there is a small gap between the metal ball needles 52 and the needle seat 51, so that the metal ball needles 52 are The needle 52 has a degree of freedom of movement.

The elastic member 6 is located in the installation chamber 102 and is compressibly disposed between the front cylinder seat 13 and the needle seat 51 . The two ends of the elastic member 6 spring against the needle seat 51 and the installation chamber 102 The stopper 134 , the elastic member 6 is a cylindrical helical compression spring and is used to generate an elastic potential energy that constantly pushes the tool set 5 to move in the direction of the piston rod 4 .

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

Referring to FIG. 4 and FIG. 11 , by the action of the airflow I, the piston rod 4 can reciprocate relative to the cylinder 3 between a pneumatic state (as shown in FIG. 4 ) and an exhaust state (as shown in FIG. 11 ) and link the The impact portion 521 generates impact force.

Referring to FIGS. 4 and 8 , in the pneumatic state, the through holes 45 of the hole structure 40 communicate with the annular groove 311, so that the airflow I flows along the through holes 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 actuated force generated in the pneumatic state causes the tool set 5 to be driven by the air 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 touch the accommodating portion 133 of the front cylinder seat 13, and therefore, no impact force will be generated. However, if the cylinder 3 continues to move downward unexpectedly, the bottom surface of the cylinder 3 will also be blocked by the accommodating portion 133 to prevent the cylinder 3 from detaching from the piston rod 4 and failing to function.

Referring to FIGS. 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 the air outlet holes 312 of the cylinder 3 , the second air chamber The 103 and the chamber 44 will gradually communicate with the air outlet 312 of the air hole structure 310 , but the elastic member 6 is still compressed and has not released the potential energy at the moment. As shown in FIG. 11 , when the piston rod 4 moves relative to the cylinder 3 to the exhaust state, the air flow I can pass from the second air chamber 103 along the air outlet holes 312 , the accommodating space 100 , and the inlet air holes 312 . After the air hole 313 flows into the container 104, the air is exhausted to the outside through the gap between the metal ball needles 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 release the potential energy. The cylinder 3 is pushed up. On the other hand, the compressed air continuously entering from 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 make the piston rod 4 and the cylinder 3 approach again and return to the pneumatic state. Therefore, as long as the intake air is continued, the piston rod 4 can be made to reciprocate relative to the cylinder 3 between the pneumatic state and the exhaust state, so that the impact part 521 of the tool set 5 can continuously generate 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. The impact force can be absorbed and the vibration caused by the reciprocating movement of the piston rod 4 in the cylinder 3 can be buffered. Therefore, the shock absorption effect is better, the vibration can be effectively reduced, and the hand is more comfortable during use. In addition, since the first embodiment is provided with 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 air cylinder 3 and the piston rod. 4, the structure of the first embodiment is simple and the number of components is small. 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.

Referring to FIG. 12, it is a second embodiment of the pneumatic impact tool of the present invention, which is a gun-type pneumatic rust remover. The second embodiment is similar to the first embodiment, and the main differences are:

The pressing member 22 of the operating unit 2 is a gun-shaped handle, which is convenient for the operator to hold. The second embodiment has the same effect as the first embodiment.

Referring to FIG. 13, it is a third embodiment of the pneumatic impact tool of the present invention. The third embodiment is similar to the first embodiment, and the main differences are:

The tool kit 5 is a chisel that can be used to remove surface material of a larger area, and the third embodiment has the same effect as the first embodiment.

To sum up, the pneumatic impact tool of the present invention utilizes 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 has a better shock absorption effect and can effectively Vibration is reduced, so it is more comfortable to use, so it can indeed achieve the purpose of the present invention.

However, the above are only examples of the present invention, and should not limit the scope of implementation of the present invention. Any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the patent specification are still included in the scope of the present invention. within the scope of the invention patent.

1: Cylinder base unit 100: Accommodating space 101: First air chamber 102: Installation Room 103: Second air chamber 104: Container 11: Handle the barrel holder 111: seat body 112: Gas cover 113: External thread part 114: Air intake 115: valve port 116: Cover 117: Airtight inner ring 118: Airtight outer ring 119: Limit buckle 12: Main cylinder seat 121: Internal thread part 122: External thread part 13: Front barrel seat 131: Installation Department 133: accommodating part 134: Stopper 14: The first washer 15: Second washer 2: Operation unit 21: Air valve group 211: Air valve 212: Plugs 213: Tower Spring 214: Gasket 22: Press parts 3: Cylinder 31: Ring Wall 310: Stomatal Structure 311: Ring groove 312: vent 313: air inlet 32: Connection wall 4: Piston rod 40: Pore Structure 41: The first diameter segment 42: Second diameter segment 43: Intake channel 44: Room 45: Perforation 46: Through hole 47: Through hole 5: Tool Kit 51: Needle seat 52: Metal bead needle 521: Impact 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 embodiments with reference to the drawings, wherein: Fig. 1 is a sectional view of a kind of existing pneumatic descaling gun; 2 is a schematic diagram of the use of the first embodiment of the pneumatic impact tool of the present invention for connecting an air source; 3 is an exploded perspective view of the first embodiment; 4 is an incomplete cross-sectional schematic view of the first embodiment, illustrating that a pressing member of the first embodiment pushes an air valve, and a piston rod is in a pneumatic state relative to a cylinder; 5 is a view similar to FIG. 4, illustrating that the pressing member has not yet pushed the air valve, and an air inlet of a cylinder seat unit is not communicated with a first air chamber; Fig. 6 is a perspective sectional view of the cylinder; Fig. 7 is a perspective cross-sectional view of the piston rod; Fig. 8 is a sectional view taken along the line VIII-VIII in Fig. 4, illustrating that a hole structure of the piston rod communicates with a ring groove of the cylinder; 9 is a fragmentary cross-sectional view of the first embodiment, illustrating the piston rod in the pneumatic state with respect to the cylinder and a resilient member compressed; Fig. 10 is a view similar to Fig. 9, illustrating the piston rod is moved away from each other relative to the cylinder; Fig. 11 is a view similar to Fig. 10 illustrating the movement of the piston rod relative to the cylinder to an exhaust state; 12 is a perspective view of a second embodiment of the pneumatic impact tool of the present invention; and 13 is a perspective view of the third embodiment of the pneumatic impact tool of the present invention.

1: Cylinder base unit

100: Accommodating space

101: First air chamber

102: Installation Room

103: Second air chamber

104: Container

11: Handle the barrel holder

111: seat body

112: Gas cover

114: Air intake

115: valve port

117: Airtight inner ring

119: Limit buckle

12: Main cylinder seat

13: Front barrel seat

131: Installation Department

133: accommodating part

134: Stopper

14: The first washer

15: Second washer

2: Operation unit

21: Air valve group

211: Air valve

212: Plugs

213: Tower Spring

214: Gasket

22: Press parts

3: Cylinder

310: Stomatal Structure

311: Ring groove

312: vent

313: air inlet

4: Piston rod

40: Pore Structure

41: The first diameter segment

42: Second diameter segment

43: Intake channel

44: Room

45: Perforation

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 seat unit, which surrounds an axis and defines a first air chamber, an accommodating space and an installation chamber which are communicated with each other. The first air chamber and the installation chamber are located at 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 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, and the ring wall and the connecting wall are matched to define A second air chamber facing the first air chamber, and a receiving groove facing the installation chamber, the second air chamber is substantially not in direct communication with the receiving groove, and the inner wall surface of the annular wall has a circumference around the axis and a ring groove formed in the second air chamber, and an air hole structure for communicating with the second air chamber, the accommodating space and the accommodating groove respectively; A piston rod is telescopically arranged on the cylinder and the cylinder base unit, two opposite ends of the piston rod respectively extend into the second air chamber and the first air chamber, and the piston rod is slidably abutted against the On the inner wall surface of the cylinder, the piston rod has an 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 intake passage is substantially The upper part is not directly communicated with the chamber, the hole structures are respectively opened to the outside, the air inlet channel and the chamber, the air source enters the air inlet and forms a flow from the first air chamber into the air inlet channel The air flow is used to push the piston rod to move in the direction of the container; a tool set, detachably disposed in the cavity of the cylinder, the tool set has an impact part exposed to the cylinder seat unit; and an elastic member, which can be compressibly disposed in the installation chamber and used to generate an elastic force that constantly pushes the tool set to move in the direction of the piston rod, The piston rod can reciprocate relative to the cylinder between an aerodynamic state and an exhaust state, and is linked to the impact portion to generate impact force. In the aerodynamic state, the hole structures are communicated with the annular groove, and the airflow enters The second air chamber is pressurized to generate an air force that causes the piston rod and the cylinder to move in the opposite direction, so that the tool set is driven by the cylinder and compresses the elastic member. In the exhaust state, The accommodating chamber is communicated with the accommodating tank through the air hole structures, so that the airflow flows out of the accommodating tank for exhausting, and the elastic member releases the potential energy. The pneumatic impact tool according to claim 1, wherein the air hole structure of the air cylinder has at least one air outlet hole and at least one air inlet hole, the air outlet hole is communicated with the second air chamber and the accommodating space, and the air inlet hole is communicated with the accommodating groove and the accommodating space. The pneumatic impact tool of claim 2, wherein the annular groove is further away from the accommodating groove than the air outlet hole. 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, the through hole and the through hole are located in the circumferential direction around the axis and are angularly offset from each other , the through hole is open to the outside and the air inlet channel, and the through hole is open 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, and the through hole opens in the chamber and extends to the through hole. The pneumatic impact tool as claimed in claim 1, wherein the barrel seat unit comprises a handle barrel seat, a main barrel seat rotatably screwed to the handle barrel seat, and a main barrel seat rotatably screwed to the main barrel seat The front barrel seat is formed with the air inlet and the first air chamber, the main barrel seat is formed with the accommodating space, and the front barrel seat is formed with the installation chamber. The pneumatic impact tool of claim 6, wherein the barrel seat unit further comprises a first washer disposed between the handle barrel seat and the main barrel seat, and a first washer disposed between the main barrel seat and the front barrel seat Second washer. The pneumatic impact tool of claim 6, wherein the handle holder has a seat and an air cover, the first air chamber is defined by the seat and the air cover, and the piston rod is movably penetrated through the gas 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 passed through 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 as claimed in claim 6, further comprising an operation unit, the operation unit comprising an air valve for blocking the air inlet and the first air chamber, and an air valve disposed on the handle holder in a pressable manner The pressing piece is used to push the air valve.

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