Pneumatic nail pulling gun

Abstract

The pneumatic nail pulling gun comprises a gun body and a handle, an air cylinder is arranged in the gun body, an air storage cavity is formed between the gun body and the air cylinder, an air inlet communicated with the air storage cavity and a compressed air source is formed in the side wall of the gun body, the upper end of the gun body is connected with an air cylinder cover, and an opening and closing valve assembly is arranged between the air cylinder cover and the air cylinder. An exhaust channel is arranged between the opening and closing valve assembly and the cylinder cover, a piston rod is connected in the cylinder in a sliding and sealing mode so as to divide an inner cavity of the cylinder into an upper air cavity and a lower air cavity, and the lower end of the piston rod penetrates out of the gun body to be connected with the nail pulling claw and is connected with the gun body in a sliding and sealing mode. The nail pulling device is simple in structure and convenient to operate, a compressed air source is used as power to replace manpower to pull out nails, the labor intensity is relieved, the working efficiency is improved, the nails can be pulled out vertically, bending deformation of the nails is effectively avoided, and recycling is facilitated.

Description

Technical Field

[0001] The present invention relates to a pneumatic nail puller. Background Art

[0002] During the processes of template and wooden pallet recycling, processing, and disassembly, it is necessary to first pull out the nails. At present, nail pulling is usually carried out manually using pliers or a claw hammer, which is inconvenient to operate, has a large labor intensity, low work efficiency, and is time-consuming and laborious. Therefore, in the recycling and reuse of templates and wooden pallets, the existing technology still needs to be improved and developed. Summary of the Invention

[0003] In view of the deficiencies in the above problems, the present invention provides a pneumatic nail puller.

[0004] To achieve the above object, the present invention provides a pneumatic nail puller, including a gun body and a handle. A cylinder is provided inside the gun body, and there is an air storage cavity between the two. An air inlet communicating the air storage cavity and a compressed air source is provided on the side wall of the gun body, and the upper end is connected to a cylinder head. An opening and closing valve assembly is provided between the cylinder head and the cylinder. An exhaust passage is provided between the opening and closing valve assembly and the cylinder head. A piston rod is slidably and sealingly connected inside the cylinder to divide the inner cavity of the cylinder into an upper air cavity and a lower air cavity. The lower end of the piston rod passes through the gun body and is connected to a nail pulling claw, and is slidably and sealingly connected to the gun body. A solenoid valve is provided on the handle. The solenoid valve, the cylinder head, and the gun body are provided with an intermediate passage communicating with the air storage cavity corresponding to the movable part of the opening and closing valve assembly, and the opening and closing of the intermediate passage is controlled by the solenoid valve. In the no-air state, the movable part of the opening and closing valve assembly blocks the communication between the air storage cavity and the upper air cavity, the upper air cavity communicates with the outside through the exhaust passage, the air storage cavity communicates with the lower air cavity, and does not communicate with the intermediate passage. In the air-filling state, the movable part of the opening and closing valve assembly is opened by the air pressure in the air storage cavity to communicate the air storage cavity with the upper air cavity, and the communication between the upper air cavity and the exhaust passage is closed. The piston rod is pressed to move to the lowest position of the cylinder. When the solenoid valve is energized to open the intermediate passage, after the air pressure on the movable part of the opening and closing valve assembly is balanced, it resumes blocking the communication between the air storage cavity and the upper air cavity, opens the communication between the upper air cavity and the exhaust passage, and the piston rod is pressed to move to the highest position of the cylinder to achieve nail pulling.

[0005] Further, a first annular sleeve part and a second annular sleeve part are provided in the cylinder head from outside to inside. The opening and closing valve assembly includes an upper buffer pad, an opening and closing valve ring, and an opening and closing compression spring. The upper buffer pad is clamped inside the second annular sleeve part and there is an exhaust gap between it and the second annular sleeve part. A plurality of exhaust holes are provided on the cylinder head, and the exhaust holes and the exhaust gap form an exhaust passage. The opening and closing valve ring is slidably and sealingly arranged between the first annular sleeve part and the second annular sleeve part and is driven by the opening and closing compression spring to block the communication between the air storage cavity and the upper air cavity. In the air-filling state, the opening and closing valve ring is pressed to move upward and abuts against the upper buffer pad to close the communication between the upper air cavity and the exhaust passage.

[0006] Further, the opening and closing valve assembly further includes an opening and closing valve fixing ring, which is clamped above the cylinder and cooperates with the opening and closing valve ring to block the communication between the air storage cavity and the upper air cavity, and a convex ring portion is provided corresponding to the first ring sleeve portion. A plurality of ventilation grooves are provided at the lower end of the first ring sleeve portion, and a plurality of ventilation holes are provided on the opening and closing valve fixing ring corresponding to the ventilation grooves. An annular groove is provided on the lower side wall of the outer side wall of the opening and closing valve ring.

[0007] Further, the solenoid valve includes a valve body, a valve rod, a first spring member, a trigger, and an adjustment assembly. The valve body is fixedly connected to the side wall of the gun body and is internally provided with an installation cavity communicating with the middle channel. The valve rod is slidably disposed in the installation cavity and is driven by the first spring member to block and close the middle channel. The trigger is hinged to the handle and controls the axial movement of the valve rod to open the middle channel through the adjustment assembly.

[0008] Further, the adjustment assembly includes a solenoid valve coil, an electronic switch, a controller, a battery pack, and a main power switch. The solenoid valve coil is fixedly connected to the valve body and its output end cooperates with the valve rod. The electronic switch is fixedly provided on the handle and transmits an electrical signal to the controller under the drive of the trigger. The controller is fixedly connected to the handle and is electrically connected to the solenoid valve coil and the battery pack. The battery pack is fixedly provided on the handle and is electrically connected to the main power switch. The main power switch is fixedly provided on one side of the gun body.

[0009] Further, a first channel and a second channel are respectively provided on the gun body. The cylinder head is provided with a third channel corresponding to the movable member of the closing valve assembly and communicating with the second channel. The valve body is provided with a fourth channel and a fifth channel communicating with the installation cavity. The fourth channel corresponds to the first channel and communicates with the air storage cavity. The fifth channel corresponds to the second channel and communicates with the third channel. The first channel, the second channel, the third channel, the fourth channel, and the fifth channel form the middle channel. An abutting ring portion is provided on the inner wall of the valve body and extends inwards between the fourth channel and the fifth channel. A sealing convex ring portion is provided on the side wall of the valve rod and an installation groove is provided at the head. The two ends of the first spring member respectively abut between the gun body and the installation groove, and are used to seal and connect the sealing convex ring portion on the valve rod and the abutting ring portion to block the communication between the fourth channel and the fifth channel. When the valve rod is axially moved towards the first spring member under the drive of the adjustment assembly, the sealing convex ring portion on the valve rod leaves the abutting ring portion to open the communication between the fourth channel and the fifth channel.

[0010] Further, an air compressor is provided on one side of the gun body, and a start-stop switch is provided on the air path between the air compressor and the air inlet. The start-stop switch is fixedly provided on one side of the gun body.

[0011] Further, a lower buffer pad is provided at the lower end inside the gun body, and the lower buffer pad is sleeved outside the piston rod.

[0012] Further, an air outlet is provided below the side wall of the gun body, and an air outlet valve is provided at the air outlet.

[0013] Furthermore, the gun body is divided into an upper gun body and a lower gun body that are detachably connected. A straight pipe portion for the piston rod to move is provided at the lower end of the lower gun body. A guide chute is provided on one side of the straight pipe portion along the moving direction. The nail pulling claw passes through the guide chute and is connected to the lower end of the piston rod. A safety guard is provided at the lower end of the lower gun body corresponding to the nail pulling claw.

[0014] The beneficial effects of the present invention compared with the prior art are as follows: The structure of the present invention is simple and easy to operate. It uses compressed air source as power to replace manual labor to pull out nails, reducing the labor intensity, improving the work efficiency, and can pull out nails vertically, effectively avoiding the bending deformation of nails for recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a cross-sectional view of a pneumatic nail puller of the present invention; Figure 2 is a perspective view of the upper gun body involved in this solution; Figure 3 is a perspective view of the cylinder head involved in this solution; Figure 4 is a perspective view of the upper buffer pad involved in this solution; Figure 5 is a perspective view of the pneumatic nail puller involved in this solution. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] As Figure 1As shown in the figure, a pneumatic nail puller according to an embodiment of the present invention includes a gun body 1 and a handle 4. A cylinder 5 is provided in the gun body 1, and there is an air storage cavity 6 between the two. An air inlet 1-1 is provided on the side wall of the gun body 1, and the air inlet 1-1 is used to connect the air storage cavity 6 and a compressed air source. The upper end of the gun body 1 is connected to a cylinder head 7. An opening and closing valve assembly 9 is provided between the cylinder head 7 and the cylinder 5. An exhaust passage 15 is provided between the opening and closing valve assembly 9 and the cylinder head 7. A piston rod 16 is slidably and sealingly connected in the cylinder 5 to divide the inner cavity of the cylinder 5 into an upper air cavity 5-1 and a lower air cavity 5-2. The lower end of the piston rod 16 passes through the gun body 1 and is connected to a nail pulling claw 17 and is slidably and sealingly connected to the gun body 1. A solenoid valve 19 is provided on the handle 4. The solenoid valve 19, the cylinder head 7, and the gun body 1 are provided with an intermediate passage 29 communicating with the air storage cavity 6 corresponding to the movable member of the opening and closing valve assembly 9. The opening and closing of the intermediate passage 29 is controlled by the solenoid valve 19. In the non-air state, the movable member of the opening and closing valve assembly 9 blocks the communication between the air storage cavity 6 and the upper air cavity 5-1. The upper air cavity 5-1 communicates with the outside through the exhaust passage 15. The air storage cavity 6 communicates with the lower air cavity 5-2 and is not connected to the intermediate passage 29. In the air filling state, the movable member of the opening and closing valve assembly 9 is opened by the air pressure in the air storage cavity 6 to connect the air storage cavity 6 and the upper air cavity 5-1 and closes the communication between the upper air cavity 5-1 and the exhaust passage 15. The piston rod 16 is pressed to move to the lowest position of the cylinder 5. When the solenoid valve 19 is energized to open the intermediate passage 29, after the air pressure on the movable member of the opening and closing valve assembly 9 is balanced, it resumes blocking the communication between the air storage cavity 6 and the upper air cavity 5-1 and opens the communication between the upper air cavity 5-1 and the exhaust passage 15. The piston rod 16 is pressed to move along the axis of the cylinder 5 to the highest position of the cylinder 5 to pull out the nail. The operation is convenient. Using the compressed air source as the power to replace manual labor to pull out the nail reduces the labor intensity, improves the work efficiency, and can pull out the nail vertically, effectively avoiding the nail from being bent and deformed, so as to facilitate recycling.

[0017] Specifically, as Figure 1 , Figure 2 shown, the gun body 1 in this embodiment is divided into an upper gun body 2 and a lower gun body 3. The upper gun body 2 and the lower gun body 3 are detachably fixed by bolts, and can also be detachably fixed by other connection methods. Among them, the lower end of the upper gun body 2 is provided with an installation bottom 2-1 along the circumference for cooperating with the cylinder head 7 to limit the axial movement of the cylinder 5, and a plurality of air inlet grooves 2-11 are provided on the installation bottom 2-1 to make the air storage cavity 6 communicate with the lower air cavity 5-2. The lower end of the lower gun body 3 is provided with a straight pipe portion 3-1 for the piston rod 16 to move. A guide chute 3-11 is provided on one side of the straight pipe portion 3-1 along the moving direction. The nail pulling claw 17 passes through the guide chute 3-11 and is connected to the lower end of the piston rod 16. A safety guard 18 is provided corresponding to the nail pulling claw 17 at the lower end of the lower gun body 3. The setting of the safety guard 18 effectively protects the operator. When the nail is pulled out, the ejected nail can only fall into the safety guard 18 in a restricted manner.

[0018] Furthermore, as Figure 1 ,Figure 3 , Figure 4 , Figure 5 As shown in Figure 3 , Figure 4 , and Figure 5 , in the cylinder head 7 of this embodiment, a first ring sleeve portion 7-1 and a second ring sleeve portion 7-2 are provided from the outside to the inside. An inner concave ring groove 7-21 is provided inside the second ring sleeve portion 7-2. The opening and closing valve assembly 9 includes an upper buffer pad 10, an opening and closing valve ring 11, and an opening and closing compression spring 12. The upper buffer pad 10 is provided with a plurality of clamping protrusions 10-1 corresponding to the inner concave ring groove 7-21. The diameter of the clamping protrusion 10-1 is smaller than the maximum diameter of the concave ring groove 7-21 and larger than the minimum diameter of the concave ring groove 7-21. The upper buffer pad 10 is clamped in the concave ring groove 7-21 of the second ring sleeve portion 7-2 through the clamping protrusion 10-1. And a flow-through groove 10-2 is provided between adjacent clamping protrusions 10-1 of the upper buffer pad 10, so that an exhaust gap 14 exists between the upper buffer pad 10 and the second ring sleeve portion 7-2. A plurality of exhaust holes 7-3 are provided on the cylinder head 7, and an exhaust cover 8 is provided at the upper end. The exhaust holes 7-3 and the exhaust gap 14 form an exhaust passage 15. A through hole is provided on the exhaust cover 8, and the exhaust passage 15 communicates with the outside through the through hole; at the same time, the opening and closing valve ring 11 is slidably sealed between the first ring sleeve portion 7-1 and the second ring sleeve portion 7-2 and is driven by the opening and closing compression spring 12 to block the communication between the air storage cavity 6 and the upper air cavity 5-1; in the inflation state, after the opening and closing valve ring 11 is pressed upward and abuts against the upper buffer pad 10 to close the communication between the upper air cavity 5-1 and the exhaust passage 15, the opening and closing compression spring 12 is further compressed. When the solenoid valve 19 is energized to open the middle passage 29, after the air pressure on the moving part of the opening and closing valve assembly 9 is balanced, the moving part of the opening and closing valve assembly 9 is moved downward by the action of the opening and closing compression spring 12 to block the communication between the air storage cavity 6 and the upper air cavity 5-1 and open the communication between the upper air cavity 5-1 and the exhaust passage 15.

[0019] Furthermore, as Figure 1 shown, the opening and closing valve assembly 9 in this embodiment further includes an opening and closing valve fixing ring 13. The opening and closing valve fixing ring 13 is clamped above the cylinder 5 and cooperates with the opening and closing valve ring 11 to block the communication between the air storage cavity 6 and the upper air cavity 5-1. And a protruding ring portion 13-1 is provided corresponding to the first ring sleeve portion 7-1. A plurality of ventilation grooves 7-11 are provided at the lower end of the first ring sleeve portion 7-1. The opening and closing valve fixing ring 13 is provided with a plurality of ventilation holes 13-2 corresponding to the ventilation grooves 7-11. An annular groove 11-1 is provided below the outer side wall of the opening and closing valve ring 11; in the inflation state, the air pressure in the air storage cavity 6 acts on the annular groove 11-1 of the opening and closing valve ring 11, and the opening and closing valve ring 11 is pressed upward to open the communication between the air storage cavity 6 and the upper air cavity 5-1 and close the communication between the upper air cavity 5-1 and the exhaust passage 15.

[0020] Furthermore, as Figure 1As shown in the figure, the solenoid valve 19 in this embodiment includes a valve body 20, a valve stem 21, a first spring member 22, a trigger 23, and an adjustment assembly. The valve body 20 is fixedly connected to the side wall of the gun body 1 and is internally provided with an installation cavity 20-1 communicating with the intermediate channel 29. The valve stem 21 is slidably disposed in the installation cavity 20-1 and is driven by the first spring member 22 to block and close the intermediate channel 29. The trigger 23 is hinged to the handle 4 and controls the axial movement of the valve stem 21 to open the intermediate channel 29 through the adjustment assembly. The adjustment assembly includes a solenoid valve coil 24, an electronic switch 25, a controller 26, a battery pack 27, and a main power switch 28. The solenoid valve coil 24 is fixedly connected to the valve body 20 and its output end cooperates with the valve stem 21. The electronic switch 25 is fixedly arranged on the handle 4 and is driven by the trigger 21 to transmit an electrical signal to the controller 26. The controller 26 is fixedly connected to the handle 4 and is electrically connected to the solenoid valve coil 24 and the battery pack 27. The battery pack 27 is fixedly arranged on the handle 4 and is electrically connected to the main power switch 28. The main power switch 28 is fixedly arranged on one side of the gun body 1. Among them, the electronic switch 25 is of the normally open type. When the trigger 23 is pulled, after the controller 26 receives the electrical signal, it controls the solenoid valve coil 24 to be energized, and the valve stem 21 moves axially under the action of the electromagnetic force to open the intermediate channel 29.

[0021] Specifically, as Figure 1 shown, the gun body 1 in this embodiment is respectively provided with a first channel 1-2 and a second channel 1-3. Above the corresponding opening and closing valve ring 11 of the cylinder head 7, there is a third channel 7-4 communicating with the second channel 1-3. The valve body 20 is provided with a fourth channel 20-2 and a fifth channel 20-3 communicating with the installation cavity 20-1. The fourth channel 20-2 corresponds to the first channel 1-2 and communicates with the air storage cavity 6. The fifth channel 20-3 corresponds to the second channel 1-3 and communicates with the third channel 7-4. The first channel 1-2, the second channel 1-3, the third channel 7-4, the fourth channel 20-2, and the fifth channel 20-3 form the intermediate channel 29. An abutting ring portion 20-4 is inwardly provided on the inner wall of the valve body 20 between the fourth channel 20-2 and the fifth channel 20-3. A sealing convex ring portion 21-1 is provided on the side wall of the valve stem 21, and an installation groove 21-2 is provided on the head. The two ends of the first spring member 22 respectively abut between the gun body 1 and the installation groove 21-2, and are used to hermetically connect the sealing convex ring portion 21-1 on the valve stem 21 with the abutting ring portion 20-4 to block the communication between the fourth channel 20-2 and the fifth channel 20-3. And when the valve stem 21 is driven by the adjustment assembly to axially move towards the first spring member 22, the sealing convex ring portion 21-1 on the valve stem 21 leaves the abutting ring portion 20-4 to open the communication between the fourth channel 20-2 and the fifth channel 20-3.

[0022] Furthermore, as Figure 1As shown in the figure, an air compressor 30 is provided on one side of the gun body 1 in this embodiment. The air compressor 30 can be powered by a built-in lithium battery or by the battery pack 27 in the control module 19. A start-stop switch 31 is provided on the air path between the air compressor 30 and the air inlet 1-1 to open and close the air path connection between the air compressor 30 and the air inlet 1-1. The start-stop switch 31 is fixedly installed on one side of the gun body 1. During use, the air compressor 30 is used to inflate the air storage cavity 6. When the air pressure in the air path reaches 130 PSI, the air compressor 30 stops producing gas. After one nail extraction, when the air pressure drops below 100 PSI, the start-stop switch 32 of the air compressor 30 closes the valve, and the air compressor starts to increase the pressure. After reaching 130 PSI, it stops again. Such a cycle supplies air for this product. At the same time, a low-pressure protection switch 32 is also connected to one side of the gun body 1. The low-pressure protection switch 32 is connected in series with the electronic switch 25 and the controller 26, or the low-pressure protection switch 32 is connected in series with the controller 26 and the solenoid valve coil 24. When the low-pressure protection switch 32 is connected in series with the electronic switch 25 and the controller 26, when the pressure reaches the set pressure value, the low-pressure protection switch 32 closes the valve, and the controller 26 can receive the electrical signal of the electronic switch 25 and control the solenoid valve coil 24 to be energized to open the middle channel 29 to pull out the nail. When the low-pressure protection switch 32 is connected in series with the controller 26 and the solenoid valve coil 24, when the pressure reaches the set pressure value, the low-pressure protection switch 32 closes the valve, and the controller 26 can control the solenoid valve coil 24 to be energized to open the middle channel 29 to pull out the nail. Both connection methods ensure the effective operation of the trigger 23.

[0023] Further, as Figure 1 shown, a lower buffer pad 33 is provided at the lower end inside the gun body 1 in this embodiment. The lower buffer pad 33 is sleeved outside the piston rod 16. The lower buffer pad 33 and the upper buffer pad 10 cooperate to provide a buffer force for the movement of the piston cylinder 16, effectively improving the service life of the product.

[0024] Further, as Figure 1 、 Figure 5 shown, an air outlet 1-4 is provided below the side wall of the gun body 1 in this embodiment, and an air outlet valve 34 is provided at the air outlet 1-4. After the nail extraction operation is completed, the air outlet valve 34 can be opened to discharge the compressed gas or liquid in the air storage cavity 6.

[0025] At the same time, all the sealed connections in the above description are sealed with sealing rings. The sealing method is simple and the sealing effect is good.

[0026] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pneumatic nail gun, characterized in that: The invention comprises a gun body (1) and a handle (4), wherein a cylinder (5) is provided in the gun body (1), and an air storage chamber (6) is provided between the two. An air inlet (1-1) which communicates with the air storage chamber (6) and a compressed air source is provided on a side wall of the gun body (1), and an upper end of the gun body (1) is connected to a cylinder head (7). An opening and closing valve assembly (9) is provided between the cylinder head (7) and the cylinder (5), and an exhaust passage (15) is provided between the opening and closing valve assembly (9) and the cylinder head (7). A sliding seal is provided in the cylinder (5). The piston rod (16) is sealed and connected to divide the inner cavity of the cylinder (5) into an upper air cavity (5-1) and a lower air cavity (5-2); the lower end of the piston rod (16) passes through the gun body (1) and is connected to the nail pulling claw (17), and is slidably sealed and connected to the gun body (1); the handle (4) is provided with a solenoid valve (19); the solenoid valve (19), the cylinder cover (7), and the movable parts of the gun body (1) corresponding to the opening and closing valve assembly (9) are provided with an intermediate channel (29) communicating with the air storage cavity (6); The middle passage (29) is opened and closed by the electromagnetic valve (19); in the airless state, the movable part of the opening and closing valve assembly (9) blocks the communication between the air storage chamber (6) and the upper air chamber (5-1), the upper air chamber (5-1) is communicated with the outside through the exhaust passage (15), the air storage chamber (6) is communicated with the lower air chamber (5-2) and is not connected with the middle passage (29); in the inflated state, the movable part of the opening and closing valve assembly (9) is opened by the air pressure in the air storage chamber (6) to communicate with the upper air chamber (5-1 ) is connected, the upper air chamber (5-1) is closed and connected to the exhaust passage (15), the piston rod (16) is pressed and moved to the lowest position of the cylinder (5), when the solenoid valve (19) is energized to open the intermediate passage (29), the air pressure on the movable part of the opening and closing valve assembly (9) is balanced and restored to block the connection between the air storage chamber (6) and the upper air chamber (5-1), open the connection between the upper air chamber (5-1) and the exhaust passage (15), the piston rod (16) is pressed and moved to the highest position of the cylinder (5), so as to achieve nail removal.

2. A pneumatic nail gun according to claim 1, characterized in that: The cylinder head (7) is provided with a first ring sleeve portion (7-1) and a second ring sleeve portion (7-2) from the outside to the inside. The opening and closing valve assembly (9) comprises an upper buffer pad (10), an opening and closing valve ring (11), and an opening and closing compression spring (12). The upper buffer pad (10) is clamped in the second ring sleeve portion (7-2) and an exhaust gap (14) exists between the upper buffer pad (10) and the second ring sleeve portion (7-2). The cylinder head (7) is provided with a plurality of exhaust holes (7-3). The exhaust holes ( The exhaust passage (15) is formed by a plurality of opening and closing valve rings (11) and an exhaust gap (14); the opening and closing valve ring (11) is slidingly sealed and arranged between the first ring sleeve portion (7-1) and the second ring sleeve portion (7-2), and is driven by an opening and closing compression spring (12) to block the communication between the air storage chamber (6) and the upper air chamber (5-1); in an inflated state, the opening and closing valve ring (11) is pressed upward and abuts against the upper buffer pad (10), so as to close the communication between the upper air chamber (5-1) and the exhaust passage (15).

3. A pneumatic nail gun according to claim 2, characterized in that: The on-off valve assembly (9) further comprises an on-off valve fixing ring (13), the on-off valve fixing ring (13) being clamped above the cylinder (5) and cooperating with the on-off valve ring (11) to seal the air storage chamber (6) and the upper air chamber (5-1) so as to communicate with each other, and a raised ring portion (13-1) is provided corresponding to the ring sleeve portion 1 (7-1), a plurality of ventilation grooves (7-11) are provided at the lower end of the ring sleeve portion 1 (7-1), a plurality of ventilation holes (13-2) are provided corresponding to the ventilation grooves (7-11), and an annular groove (11-1) is provided at the lower side of the outer side wall of the on-off valve ring (11).

4. The pneumatic nail gun according to claim 1, characterized in that: The solenoid valve (19) comprises a valve body (20), a valve stem (21), a spring member (22), a trigger (23), and an adjusting assembly. The valve body (20) is fixedly connected to the side wall of the gun body (1) and is provided with an installation cavity (20-1) communicating with the intermediate channel (29). The valve stem (21) is slidably arranged in the installation cavity (20-1) and is driven by the spring member (22) to seal and close the intermediate channel (29). The trigger (23) is hinged to the handle (4) and controls the axial movement of the valve stem (21) through the adjusting assembly to open the intermediate channel (29).

5. A pneumatic nail gun according to claim 4, characterized in that: The regulating assembly comprises a solenoid valve coil (24), an electronic switch (25), a controller (26), a battery pack (27), and a main power switch (28). The solenoid valve coil (24) is fixedly connected to the valve body (20), and the output end cooperates with the valve stem (21). The electronic switch (25) is fixedly mounted on the handle (4) and driven by the trigger (21) to transmit an electrical signal to the controller (26). The controller (26) is fixedly mounted on the handle (4) and is circuit-connected to the solenoid valve coil (24) and the battery pack (27). The battery pack (27) is fixedly mounted on the handle (4) and is circuit-connected to the main power switch (28). The main power switch (28) is fixedly mounted on one side of the gun body (1).

6. A pneumatic nail gun according to claim 4 or 5, characterized in that: The gun body (1) is provided with a channel 1 (1-2) and a channel 2 (1-3), respectively; the cylinder head (7) is provided with a movable part corresponding to the closing valve assembly (9) and connected to the channel 2 (1-3); the valve body (20) is provided with a channel 4 (20-2) and a channel 5 (20-3) connected to the mounting cavity (20-1); the channel 4 (20-2) corresponds to the channel 1 (1-2) and is connected to the air storage cavity (6); the channel 5 (20-3) corresponds to the channel 2 (1-3) and is connected to the channel 3 (7-4); the channel 1 (1-2), the channel 2 (1-3), the channel 3 (7-4), the channel 4 (20-2) and the channel 5 (20-3) form an intermediate channel (29); the inner wall of the valve body (20) is connected to the channel 4 ( A contact ring portion (20-4) is provided inwardly between the valve stem (20-2) and the channel five (20-3), a sealing convex ring portion (21-1) is provided on the side wall of the valve stem (21), and a mounting groove (21-2) is provided on the head, and two ends of the spring member (22) are respectively abutted between the gun body (1) and the mounting groove (21-2) to seal the sealing convex ring portion (21-1) on the valve stem (21) and the contact ring portion (20-4) to achieve blocking the communication between the channel four (20-2) and the channel five (20-3), and when the valve stem (21) is driven by the adjustment component to move axially in the direction of the spring member (22), the sealing convex ring portion (21-1) on the valve stem (21) leaves the contact ring portion (20-4) to achieve opening the communication between the channel four (20-2) and the channel five (20-3).

7. The pneumatic nail extractor according to claim 1, characterized in that: An air compressor (30) is provided on one side of the gun body (1), and a start-stop switch (31) is provided on the air path between the air compressor (30) and the air inlet (1-1), and the start-stop switch (31) is fixedly mounted on one side of the gun body (1).

8. The pneumatic nail extractor according to claim 1, characterized in that: A lower buffer pad (33) is provided at the lower end of the gun body (1), and the lower buffer pad (33) is sleeved outside the piston rod (16).

9. The pneumatic nail gun according to claim 1, characterized in that: An air outlet (1-4) is provided below the side wall of the gun body (1), and an air outlet valve (34) is provided at the air outlet (1-4).

10. A pneumatic nail extractor according to claim 1 or 7 or 8 or 9, characterized in that: The gun body (1) is divided into an upper gun body (2) and a lower gun body (3) which are detachably connected. The lower end of the lower gun body (3) is provided with a straight tube portion (3-1) for the piston rod (16) to move. A guide groove (3-11) is provided on one side of the straight tube portion (3-1) along the moving direction. The nail pulling claw (17) passes through the guide groove (3-11) and is connected to the lower end of the piston rod (16). The lower end of the lower gun body (3) is provided with a safety shield (18) corresponding to the nail pulling claw (17).

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