CN210061384U

CN210061384U - Pneumatic perforating gun

Info

Publication number: CN210061384U
Application number: CN201920510519.2U
Authority: CN
Inventors: 高志成
Original assignee: SIHUI YANCHUANG ELECTRICAL APPLIANCES CO Ltd
Current assignee: SIHUI YANCHUANG ELECTRICAL APPLIANCES CO Ltd
Priority date: 2019-04-15
Filing date: 2019-04-15
Publication date: 2020-02-14
Anticipated expiration: 2029-04-15

Abstract

The utility model discloses a pneumatic rifle that punches, include body, trigger device, hold power device and go up the mould device, the body includes the rifle body, front end housing, rear end cap and the stock of a gun, the stock of a gun sets up one side of the rifle body and with rifle body fixed connection, trigger device sets up in the stock of a gun, trigger device includes valve control handle, valve rod and reset spring, valve control handle's one end with the stock of a gun is articulated, the stock of a gun is close to valve control handle is equipped with movable chamber, the one end of valve rod with valve control handle is articulated, the tip fixed connection of the valve rod other end reset spring stretches into movable chamber is intracavity, and with the movable intracavity wall butt of stock of a gun, it includes piston rod, piston rod base, spring and hydraulic oil to hold power device. The utility model discloses a puncher simple structure, controllability are strong, punch efficiently, very easily change different pipe diameters.

Description

Pneumatic perforating gun

Technical Field

The utility model relates to a drilling equipment field, concretely relates to pneumatic perforating gun.

Background

At present, plastics, the pneumatic puncher structure of blanking that the paper article carried out porous blanking and use is complicated, the structure reproducibility is low, lead to product development cycle length, delivery date is slow, high in production cost, and because poor stability, it is short-lived, cause the pass precision of punching to be low, easily produce badly, be unfavorable for production, in addition, in the actual work, in order to guarantee the quality of punching, the staff often need fix a position by die-cut article in addition, guarantee by the stability of die-cut article, we have designed a neotype pneumatic puncher that can punch high-efficiently for this reason.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a pneumatic rifle that punches to the not enough that efficiency of punching of present rifle exists.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a pneumatic perforating gun, includes body, trigger device, holds power device and goes up the mould device, the body includes the rifle body, front end housing, rear end cap and stock, the stock set up the one side of the rifle body and with rifle body fixed connection, trigger device sets up in the stock, trigger device includes valve control handle, valve rod and reset spring, valve control handle's one end with the stock is articulated, the stock is close to valve control handle is equipped with movable chamber, the one end of valve rod with valve control handle is articulated, the tip fixed connection of the valve rod other end reset spring stretches into movable chamber, and with the movable intracavity wall butt of stock, hold power device and include piston rod, piston rod base, spring and hydraulic oil, be equipped with first through-hole in the piston rod base, be equipped with respectively in the first through-hole hydraulic oil, The piston rod, piston rod one end with the one end butt of hydraulic oil, the other end of piston rod with the rear end cap butt, the other end of hydraulic oil stretches out the front end housing, the piston rod base with the periphery of piston rod is all nested the spring, the one end butt of spring is in on the piston rod base, the other end butt of spring is in on the piston rod, the activity chamber be equipped with gas passage with the rifle body intercommunication.

Optionally, a sealing groove is formed in the periphery of the piston rod, which is close to the rear end cover, and a piston rod sealing ring is arranged in the sealing groove.

Optionally, an exhaust passage and an air inlet passage are further arranged in the gun handle, and the air inlet passage and the exhaust passage are parallel to each other and are communicated with the movable cavity.

Optionally, a groove is formed in the periphery of the piston rod base, which is close to the front end cover, and a piston rod sealing ring is arranged in the groove.

Optionally, the periphery of the front end cover is sleeved with the upper die device, and the upper die device is close to the front end cover and provided with a locking nut.

Optionally, the upper die device comprises a lower die sleeve, a punching needle, a spring piece and an oil filling hole, the upper die device is provided with a second through hole, the periphery of the punching needle is nested in the spring piece and is arranged in the second through hole of the upper die device, and the oil filling hole is arranged right above the punching needle and close to the hydraulic oil.

Optionally, the lower die sleeve and the upper die device are coaxially arranged and fixedly connected with the inner wall of the second through hole.

Optionally, a pore channel is arranged in the middle of the lower die sleeve, and the pore channel is coaxial with the lower die sleeve.

Optionally, one side of the air inlet channel, which is far away from the gun body, is provided with a fastening groove, and a sealing gasket is arranged in the fastening groove.

Optionally, the gun body, the front end cover, the rear end cover, the piston rod base and the upper die device are all coaxially arranged.

The utility model has the advantages that: by adopting the independent air inlet channel and the independent air outlet channel, the punching operation of the whole equipment is ensured to be safer; through the arrangement of the lower die sleeve of the upper die device, the die head in the upper die can be guaranteed to be disassembled and replaced, the aperture of a punching position can be conveniently changed, and different application scenes are increased; through the cooperation of the valve control valve and the valve rod, the whole device has high controllability.

Drawings

The invention will be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the embodiments. Like reference numerals designate corresponding parts throughout the different views.

Fig. 1 is the structure diagram of the perforating gun of the utility model.

Fig. 2 is a schematic structural diagram of a point a of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention will be further described in detail with reference to the following embodiments thereof; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Other systems, methods, and/or features of the present embodiments will become apparent to those skilled in the art upon review of the following detailed description. It is intended that all such additional systems, methods, features and advantages be included within this description, be within the scope of the invention, and be protected by the accompanying claims. Additional features of the disclosed embodiments are described in, and will be apparent from, the detailed description that follows.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms described above will be understood by those of ordinary skill in the art according to the specific circumstances.

The first embodiment is as follows: as shown in fig. 1 and 2, the pneumatic perforating gun comprises a body, a trigger device, a power accumulating device and an upper die device, wherein the body comprises a gun body 15, a front end cover, a rear end cover and a gun handle 16, the gun handle 16 is arranged on one side of the gun body 15 and is fixedly connected with the gun body 15, the trigger device is arranged in the gun handle 16, the trigger device comprises a valve control handle 3, a valve rod 4 and a return spring 5, one end of the valve control handle 3 is hinged with the gun handle 16, the gun handle 16 is provided with a movable cavity 17 close to the valve control handle 3, one end of the valve rod 4 is hinged with the valve control handle 3, the end part of the other end of the valve rod 4 is fixedly connected with the return spring 5, extends into the movable cavity 17 and is abutted against the inner wall of the movable cavity 17 of the gun handle 16, and the power accumulating device comprises a piston rod 19, a piston rod base 18, Spring 2 and hydraulic oil 1, be equipped with first through-hole in the piston rod base 18, be equipped with respectively in the first through-hole hydraulic oil 1 piston rod 19, piston rod 19 one end with the one end butt of hydraulic oil 1, piston rod 19's the other end with the rear end cap butt, the other end of hydraulic oil 1 stretches out the front end housing, piston rod base 18 with piston rod 19's periphery is all nested spring 2, the one end butt of spring 2 is in on the piston rod base 18, the other end butt of spring 2 is in on the piston rod 19, the activity chamber be equipped with gas passage with the rifle body 15 intercommunication. And a sealing groove is formed in the periphery of the piston rod 19 close to the rear end cover, and a piston rod sealing ring 14 is arranged in the sealing groove. The gun handle 16 is also internally provided with an exhaust channel 7 and an air inlet channel 6, and the air inlet channel 6 and the exhaust channel 7 are parallel to each other and are communicated with the movable cavity 17. A groove is formed in the periphery of the piston rod base 18 close to the front end cover, and a piston rod sealing ring 14 is arranged in the groove. The periphery of front end housing cup joints go up the mould device, it is close to go up the mould device the front end housing is equipped with lock nut 12. The die device comprises a lower die sleeve 11, a punching needle 10, a spring piece 9 and an oil filling hole 8, the upper die device is provided with a second through hole, the spring piece 9 is embedded in the periphery of the punching needle 10 and arranged in the second through hole of the upper die device, and the oil filling hole 8 is arranged right above the punching needle and close to hydraulic oil 1. The lower die sleeve 11 and the upper die device are coaxially arranged and fixedly connected with the inner wall of the second through hole. The middle part of the lower die sleeve 11 is provided with a pore channel which is coaxial with the lower die sleeve 11. One side of the air inlet channel, which is far away from the gun body, is provided with a fastening groove, and a sealing gasket is arranged in the fastening groove. The gun body 15, the front end cover, the rear end cover, the piston rod 19, the piston rod base 18 and the upper die device are all coaxially arranged.

Example two: a pneumatic perforating gun comprises a body, a triggering device, a force accumulating device and an upper die device, wherein the body comprises a gun body 15, a front end cover, a rear end cover and a gun handle 16, the gun handle 16 is arranged on one side of the gun body 15 and fixedly connected with the gun body 15, the triggering device is arranged in the gun handle 16 and comprises a valve control handle 3, a valve rod 4 and a reset spring 5, one end of the valve control handle 3 is hinged with the gun handle 16, the gun handle 16 is provided with a movable cavity 17 close to the valve control handle 3, one end of the valve rod 4 is hinged with the valve control handle 3, the end part of the other end of the valve rod 4 is fixedly connected with the reset spring 5, the reset spring 5 extends into the movable cavity 17 and is abutted against the inner wall of the movable cavity 17 of the gun handle 16, and the force accumulating device comprises a piston rod 19, a piston rod base 18 and a piston rod, Spring 2 and hydraulic oil 1, be equipped with first through-hole in the piston rod base 18, be equipped with respectively in the first through-hole hydraulic oil 1 piston rod 19, piston rod 19 one end with the one end butt of hydraulic oil 1, piston rod 19's the other end with the rear end cap butt, the other end of hydraulic oil 1 stretches out the front end housing, piston rod base 18 with piston rod 19's periphery is all nested spring 2, the one end butt of spring 2 is in on the piston rod base 18, the other end butt of spring 2 is in on the piston rod 19, the activity chamber be equipped with gas passage with the rifle body 15 intercommunication. Specifically, the gun body 15 is a hollow barrel, the inner walls of the gun body 15 are arranged in parallel, the peripheries of the gun body 19 close to the front end cover and the rear end cover are provided with threads, and the front end cover and the rear end cover can be fastened and connected with the gun body 15 through the threads. When the valve control handle 3 is pressed down, the valve rod 4 enters the movable cavity 17 of the gun handle 16, at the moment, compressed air of the air inlet 8 enters the movable cavity 17 and enters the gun body 15 through the air channel, the piston rod 19 in the gun body 15 is pushed by the compressed air, forward pushing is achieved, and in the pushing process, the hydraulic oil 1 generates pressure on the piston in front, and then the workpiece is pushed to be punched. The piston rod 19 comprises a cross rod and a vertical rod, one end of the cross rod is fixedly connected with the symmetric center of the vertical rod, and the cross rod of the piston rod 19 is inserted into the piston rod base 18. When compressed air enters the gun body 15, the vertical rod is pushed, so that the cross rod moves in the piston rod base 18 and presses the hydraulic oil. In particular, the cross bar is parallel to the inner wall of the gun body 15. The outlet of the gas channel connecting the gun body 15 is arranged below the vertical rod so that all other parts entering the gun body 15 can push the piston rod 19 to move.

And a sealing groove is formed in the periphery of the piston rod 19 close to the rear end cover, and a piston rod sealing ring 14 is arranged in the sealing groove. In particular, the piston rod sealing ring 14 is added so that the piston rod 19 can be pushed when compressed air enters the gun body 15. That is, the compressed air acts entirely on the vertical rod of the piston rod, so that the piston rod 19 can be moved to the position of the piston rod seat 18. The sealing groove on the piston rod is formed along the periphery of the piston rod 19, and the depth of the sealing groove is smaller than the circumference of the piston rod sealing ring 14, so that the piston rod sealing ring 14 protrudes outside and is sealed with the inner wall of the gun body 15, and all compressed air is guaranteed to act on the piston rod 19.

The gun handle 16 is also internally provided with an exhaust channel 7 and an air inlet channel 6, and the air inlet channel 6 and the exhaust channel 7 are parallel to each other and are communicated with the movable cavity 17. Specifically, the exhaust passage 7 and the air inlet passage 6 are different pore canals, so that no conflict is generated in the air inlet process, when the valve control handle is pressed down and then suddenly released, the exhaust passage 7 and the air inlet passage 6 can be independently opened, and the safety characteristic is achieved. The exhaust duct 7 and the intake duct 6 in this embodiment work in parallel and independently of each other, making full use of the space of the gun holder 16, and in another embodiment, the exhaust duct 7 or the intake duct 6 may be disposed in a non-parallel state. In addition, this embodiment exhaust passage 7, inlet channel 6 parallel to each other state still makes the process of admitting air, giving vent to anger all set up in same one side, prevents that the hand from snatching to produce the influence to outlet channel 7.

A groove is formed in the periphery of the piston rod base 18 close to the front end cover, and a piston rod sealing ring 14 is arranged in the groove. Specifically, the piston rod base 18 is provided with the piston seal ring 14, so that the air tightness of the space in the whole gun body 15 is higher, and it is ensured that in the compression process of the piston rod 19, gas leaks from one side of the piston rod base 18 to affect the air tightness of the whole device, so that the punching effect of the whole piston rod 19 is poor. The piston rod base comprises an inner layer and an outer layer, and the inner layer and the outer layer are of double-layer design structures, so that the whole double-layer structure of the piston rod base 18 cannot have relative displacement, and the inner layer of the piston rod base 18 is attached to the piston rod 19 more closely. In addition, a sealing ring 13 is further arranged between the inner layer and the outer layer of the piston rod base, and the sealing ring 13 prevents the inner layer and the outer layer of the piston rod base from moving relatively, and does not have relative displacement in the moving process of the piston rod 19.

The periphery of front end housing cup joints go up the mould device, it is close to go up the mould device the front end housing is equipped with lock nut 12. The die device comprises a lower die sleeve 11, a punching needle 10, a spring piece 9 and an oil filling hole 8, the upper die device is provided with a second through hole, the spring piece 9 is embedded in the periphery of the punching needle 10 and arranged in the second through hole of the upper die device, and the oil filling hole 8 is arranged right above the punching needle and close to hydraulic oil 1. The lower die sleeve 11 and the upper die device are coaxially arranged and fixedly connected with the inner wall of the second through hole. The middle part of the lower die sleeve 11 is provided with a pore channel which is coaxial with the lower die sleeve 11. Specifically, the front end housing is equipped with lock nut 12 and makes go up the mould device with the front end housing carries out fixed connection's process more convenient, when the die head of different models size is changed to needs, the process of change saves time more, laborsaving. The punching needle 10 extends forwards under the action of the hydraulic oil, and in the process that the piston rod 19 extends forwards and compresses the hydraulic oil 1, the hydraulic oil 1 drives the punching needle 10, and the punching needle 10 abuts against a front die head, so that the die head performs punching operation. One end of the spring 9 abuts against the inner wall of the second duct, the other end of the spring piece 9 abuts against the punch pin 10, and the spring piece 9 is compressed in the process of advancing the punch pin 10. In the process that the punch pin 10 moves forwards, the spring piece 9 stores force, and when the valve control handle 3 is pressed down and the piston rod 19 is withdrawn from the piston rod base piece 18, the spring piece 9 restores the original state, so that the punch pin 10 returns to the original position, wherein the original state is when the punch pin is not pushed by the piston rod 19.

One side of the air inlet channel 6, which is far away from the gun body 15, is provided with a fastening groove, and a sealing gasket is arranged in the fastening groove. Specifically, when the recess of inlet channel 6 makes and carries out the joint with the compressed gas pipeline of peripheral hardware, convenience more still makes external pipeline have a stable impetus, guarantees the rifle body 15 is in, the in-process of work, the pipeline can not drop easily. In addition, the sealing gasket also prevents air leakage during the process of ventilating the pipeline and the gun handle 16, so that compressed air is completely acted on the piston rod 19 during the pushing process.

The gun body 15, the front end cover, the rear end cover, the piston rod 19, the piston rod base 18 and the upper die device are all coaxially arranged. Specifically, the gun body 15, the front end cover, the rear end cover, the piston rod 19, the piston rod base 18 and the upper die device are coaxially arranged, so that the whole gun body and components inside the whole gun body form a whole, and the piston rod is guaranteed to move forwards more smoothly and reliably. In addition, the coaxial arrangement also ensures more convenience in the process of maintenance or assembly.

Example three: on the basis of the second embodiment, the pneumatic punching machine of the embodiment comprises a frame, a punching machine head, a punching upper die, a punching lower die, a discharging guide rail, a discharging cylinder fixing plate, a discharging cylinder, a discharging push plate, a feeding cylinder fixing plate, a feeding cylinder, a feeding push plate, a feeding press plate rotating shaft, a feeding guide rail, a punching cylinder and a punching cylinder sliding guide rail, wherein the punching machine head is arranged above the frame, the punching upper die and the punching lower die are arranged on the punching machine head, a through hole is formed in the punching lower die and is positioned below the punching upper die, the punching cylinder sliding guide rail is arranged on the punching machine head, one end of the punching cylinder is arranged on the punching cylinder sliding guide rail, the other end of the punching cylinder is connected with the punching upper die, the discharging guide rail is arranged on one side of the punching lower die, discharging cylinder installs on discharging cylinder fixed plate, discharging cylinder's tailpiece of the piston rod links to each other with ejection of compact push pedal, ejection of compact push pedal sets up towards ejection of compact guide rail, feeding cylinder fixed plate install in the bed die that punches with discharging cylinder, one side that discharging guide rail is adjacent, feeding cylinder installs on feeding cylinder fixed plate, feeding cylinder links to each other with the feeding push pedal, the feeding push pedal is L shape, feeding clamp plate passes through the feeding clamp plate pivot and installs in the top of feeding push pedal, feeding guide rail installs in one side of feeding cylinder fixed plate, install the conveyer belt on the feeding guide rail, ejection of compact guide frame, discharge baffle mount, discharge baffle installs in one side of conveyer belt, discharge baffle is fixed in on the discharge baffle mount and it is located. The feeding guide rail is arranged on the conveying belt and is positioned between the conveying belt and the discharging guide frame. The discharging guide frame comprises a discharging guide frame pipe and a discharging guide frame pipe fixing frame, the discharging guide frame pipe fixing frame is installed on one side of the feeding guide rail, and the discharging guide frame pipe is installed on the discharging guide frame pipe fixing frame and is obliquely arranged on one side of the feeding guide rail. The feeding guide rail is arranged on the feeding guide rail, and the height limiting plate is arranged below the height limiting plate fixing frame and is positioned above the conveying belt. The distance between the height limiting plate and the feeding cylinder fixing plate is smaller than the distance between the discharging baffle plate and the feeding cylinder fixing plate.

In summary, the utility model provides a pneumatic perforating gun, which ensures the safer perforating operation of the whole device by adopting independent air inlet channel and air outlet channel; through the arrangement of the lower die sleeve of the upper die device, the die head in the upper die can be guaranteed to be disassembled and replaced, the aperture of a punching position can be conveniently changed, and different application scenes are increased; through the cooperation of the valve control valve and the valve rod, the whole device has high controllability.

Although the invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the invention. That is, the methods, systems, and devices discussed above are examples. Various configurations may omit, substitute, or add various procedures or components as appropriate. For example, in alternative configurations, the methods may be performed in an order different than that described, and/or various components may be added, omitted, and/or combined. Moreover, features described with respect to certain configurations may be combined in various other configurations, as different aspects and elements of the configurations may be combined in a similar manner. Further, elements therein may be updated as technology evolves, i.e., many elements are examples and do not limit the scope of the disclosure or claims.

Specific details are given in the description to provide a thorough understanding of the exemplary configurations including implementations. However, configurations may be practiced without these specific details, for example, well-known circuits, processes, algorithms, structures, and techniques have been shown without unnecessary detail in order to avoid obscuring the configurations. This description provides example configurations only, and does not limit the scope, applicability, or configuration of the claims. Rather, the foregoing description of the configurations will provide those skilled in the art with an enabling description for implementing the described techniques. Various changes may be made in the function and arrangement of elements without departing from the spirit or scope of the disclosure.

It is intended that the foregoing detailed description be regarded as illustrative rather than limiting, and that it be understood that it is the following claims, including all equivalents, that are intended to define the spirit and scope of this invention. The above examples are to be understood as merely illustrative of the present invention and not as limiting the scope of the invention. After reading the description of the present invention, the skilled person can make various changes or modifications to the present invention, and these equivalent changes and modifications also fall within the scope of the present invention defined by the claims.

Claims

1. A pneumatic perforating gun comprises a body, a triggering device, a power accumulating device and an upper die device, and is characterized in that the body comprises a gun body (15), a front end cover, a rear end cover and a gun handle (16), the gun handle (16) is arranged on one side of the gun body (15) and fixedly connected with the gun body (15), the triggering device is arranged in the gun handle (16), the triggering device comprises a valve control handle (3), a valve rod (4) and a reset spring (5), one end of the valve control handle (3) is hinged with the gun handle (16), the gun handle (16) is close to the valve control handle (3) and is provided with a movable cavity (17), one end of the valve rod (4) is hinged with the valve control handle (3), the end part of the other end of the valve rod (4) is fixedly connected with the reset spring (5) and extends into the movable cavity (17), and is abutted against the inner wall of a movable cavity (17) of the gun handle (16), the power storage device comprises a piston rod (19), a piston rod base (18), a spring (2) and hydraulic oil (1), a first through hole is arranged in the piston rod base (18), the hydraulic oil (1) and the piston rod (19) are respectively arranged in the first through hole, one end of the piston rod (19) is abutted against one end of the hydraulic oil (1), the other end of the piston rod (19) is abutted against the rear end cover, the other end of the hydraulic oil (1) extends out of the front end cover, the outer peripheries of the piston rod base (18) and the piston rod (19) are nested in the spring (2), one end of the spring (2) is abutted against the piston rod base (18), the other end of the spring (2) is abutted against the piston rod (19), and the movable cavity is provided with a gas channel communicated with the gun body (15).

2. The pneumatic perforating gun of claim 1, characterized in that the periphery of the piston rod (19) near the rear end cap is provided with a sealing groove in which a piston rod sealing ring (14) is arranged.

3. A pneumatic perforating gun as claimed in claim 1, characterized in that said gun holder (16) is provided with an air discharge channel (7) and an air inlet channel (6), said air inlet channel (6) and said air discharge channel (7) being parallel to each other and communicating with said movable chamber (17).

4. A pneumatic perforating gun as claimed in claim 1, characterized in that the outer circumference of the piston rod base (18) near the front end cap is provided with a groove in which a piston rod sealing ring (14) is arranged.

5. The pneumatic perforating gun of claim 1, wherein the upper die device is sleeved on the periphery of the front end cover, and a locking nut (12) is arranged on the upper die device and close to the front end cover.

6. The pneumatic perforating gun as recited in claim 5, characterized in that the upper die device comprises a lower die sleeve (11), a punch pin (10), a spring plate (9) and an oil filling hole (8), the upper die device is provided with a second through hole, the punch pin (10) is embedded in the spring plate (9) at the periphery and is arranged in the second through hole of the upper die device, and the oil filling hole (8) is arranged right above the punch pin and is close to the hydraulic oil (1).

7. A pneumatic perforating gun as claimed in claim 6, characterized in that the lower die sleeve (11) is arranged coaxially with the upper die means and is fixedly connected to the inner wall of the second through-hole.

8. The pneumatic perforating gun as claimed in claim 7, characterized in that the lower die sleeve (11) is provided with a hole in its central portion, said hole being coaxial with said lower die sleeve (11).

9. The pneumatic perforating gun as recited in claim 3 wherein a fastening groove is formed in a side of the air inlet channel away from the gun body, and a gasket is disposed in the fastening groove.

10. A pneumatic perforating gun as claimed in any one of claims 1 to 9, characterized in that the gun body (15), the front end cap, the rear end cap, the piston rod (19), the piston rod base (18) and the upper die means are arranged coaxially.