A pneumatic nail gun

Abstract

The present application provides a kind of pneumatic nail gun, including gun body and handle, the gun body is equipped with air cylinder, and there is gas storage cavity between the two, the gun body side wall is equipped with the air inlet of the communication gas storage cavity and compressed gas source, upper end is connected with cylinder cover, the cylinder cover is equipped with open-close valve assembly between the air cylinder, the open-close valve assembly is equipped with exhaust passage between the cylinder cover, the air cylinder is slidably sealed and connected with piston rod in, to divide the air cylinder cavity into upper air chamber and lower air chamber, the piston rod lower end is connected with nail claw and slidably sealed and connected with gun body by penetrating out of gun body;The present application is simple in structure, convenient to operate, uses compressed gas source as power instead of manpower to pull out nail, reduces labor intensity, improves work efficiency, and can pull out nail vertically, effectively avoids the bending deformation of nail, so as to recycle.

Description

Technical Field

[0001] This invention relates to a pneumatic nail puller. Background Technology

[0002] In the process of recycling, processing, and dismantling templates and wooden pallets, nails need to be removed first. Currently, nail removal is usually done manually using pliers or a claw hammer, which is inconvenient, labor-intensive, inefficient, time-consuming, and labor-intensive. Therefore, existing technologies for the recycling and reuse of templates and wooden pallets still need improvement and development. Summary of the Invention

[0003] To address the shortcomings mentioned above, this invention provides a pneumatic nail puller.

[0004] To achieve the above objectives, the present invention provides a pneumatic nail puller, comprising a gun body and a handle. The gun body contains a cylinder with an air storage chamber between it and the cylinder. An air inlet is provided on the side wall of the gun body, connecting the air storage chamber and a compressed air source, and its upper end is connected to the cylinder head. An on / off valve assembly is provided between the cylinder head and the cylinder, and an exhaust passage is provided between the on / off valve assembly and the cylinder head. A piston rod is slidably and sealingly connected inside the cylinder to divide the cylinder cavity into an upper air chamber and a lower air chamber. The lower end of the piston rod extends through the gun body and connects to the nail puller claw, and is slidably and sealingly connected to the gun body. A solenoid valve is provided on the handle. The movable parts of the solenoid valve, cylinder head, and gun body corresponding to the on / off valve assembly are connected to the air storage chamber. The intermediate channel is controlled by a solenoid valve to open and close. In the depressurized state, the movable part of the opening and closing valve assembly blocks the connection between the gas storage chamber and the upper gas chamber. The upper gas chamber is connected to the outside through the exhaust channel. The gas storage chamber is connected to the lower gas chamber but not to the intermediate channel. In the pressurized state, the movable part of the opening and closing valve assembly is opened by the air pressure in the gas storage chamber to connect the gas storage chamber and the upper gas chamber, and closed by the upper gas chamber to connect the exhaust channel. The piston rod is pressed and moves to the lowest position of the cylinder. When the solenoid valve is energized to open the intermediate channel, the air pressure on the movable part of the opening and closing valve assembly is balanced and the connection between the gas storage chamber and the upper gas chamber is restored, and the connection between the upper gas chamber and the exhaust channel is opened. The piston rod is pressed and moves to the highest position of the cylinder to achieve nail removal.

[0005] Furthermore, the cylinder head is provided with a first ring sleeve and a second ring sleeve from the outside to the inside. The opening and closing valve assembly includes an upper buffer pad, an opening and closing valve ring, and an opening and closing pressure spring. The upper buffer pad is engaged in the second ring sleeve and there is an exhaust gap between the upper buffer pad and the second ring sleeve. The cylinder head is provided with multiple exhaust holes. The exhaust holes and the exhaust gap form an exhaust channel. The opening and closing valve ring is slidably sealed between the first ring sleeve and the second ring sleeve and is driven by the opening and closing pressure spring to block the communication between the air storage chamber and the upper air chamber. In the charging state, the opening and closing valve ring is pressed upward and abuts against the upper buffer pad to close the communication between the upper air chamber and the exhaust channel.

[0006] Furthermore, the opening and closing valve assembly also includes an opening and closing valve fixing ring. The opening and closing valve fixing ring is engaged above the cylinder and cooperates with the opening and closing valve ring to block the air storage chamber from communicating with the upper air chamber. A protruding ring is provided on the corresponding ring sleeve part. A plurality of venting grooves are provided at the lower end of the ring sleeve part. A plurality of venting holes are provided on the opening and closing valve fixing ring corresponding to the venting grooves. An annular groove is provided on the lower side of the outer wall of the opening and closing valve ring.

[0007] Furthermore, the solenoid valve includes a valve body, a valve stem, a spring element, a trigger, and an adjustment assembly. The valve body is fixedly connected to the side wall of the gun body and has an internal mounting cavity communicating with the intermediate channel. The valve stem is slidably disposed in the mounting cavity and is driven by the spring element to block and close the intermediate channel. The trigger is hinged to the handle and controls the axial movement of the valve stem to open the intermediate channel through the adjustment assembly.

[0008] Furthermore, 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 stem. The electronic switch is fixedly mounted on the handle and is driven by the trigger to transmit electrical signals to the controller. The controller is fixedly connected to the handle and is connected to the solenoid valve coil and the battery pack circuit. The battery pack is fixedly mounted on the handle and is connected to the main power switch circuit. The main power switch is fixedly mounted on one side of the gun body.

[0009] Furthermore, the gun body is provided with channel one and channel two respectively, the cylinder head is provided with channel three corresponding to the movable part of the valve closing assembly, and the valve body is provided with channel four and channel five communicating with the mounting cavity. Channel four corresponds to channel one and communicates with the air storage cavity, and channel five corresponds to channel two and communicates with channel three. Channel one, channel two, channel three, channel four, and channel five constitute an intermediate channel. The inner wall of the valve body is provided with an abutting ring portion inward between channel four and channel five. The valve stem side wall is provided with a sealing convex ring portion and the head is provided with a mounting groove. The two ends of the spring member abut against the gun body and the mounting groove respectively, and are used to seal the sealing convex ring portion on the valve stem with the abutting ring portion to realize the blocking of the communication between channel four and channel five. When the valve stem is driven by the adjustment assembly to move axially in the direction of the spring member, the sealing convex ring portion on the valve stem leaves the abutting ring portion to realize the opening of the communication between channel four and channel five.

[0010] Furthermore, 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, and the start / stop switch is fixed on one side of the gun body.

[0011] Furthermore, a lower buffer pad is provided at the lower end of the gun body, and the lower buffer pad is sleeved on the piston rod.

[0012] Furthermore, the gun body has an air outlet on the lower side wall and an air valve at the air outlet.

[0013] Furthermore, the gun body is divided into a detachable upper gun body and a lower gun body. The lower end of the lower gun body is provided with a straight tube section for the piston rod to move. A guide groove is provided on one side of the straight tube section along the moving direction. The nail-pulling claw passes through the guide groove and is connected to the lower end of the piston rod. A safety cover is provided at the lower end of the lower gun body corresponding to the nail-pulling claw.

[0014] The advantages of this invention over the prior art are as follows: This invention has a simple structure and is easy to operate. It uses compressed air as power to remove nails instead of manual labor, which reduces labor intensity, improves work efficiency, and can remove nails vertically, effectively preventing nails from bending and deforming, so as to facilitate recycling. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of a pneumatic nail puller according to the present invention; Figure 2 This is a three-dimensional view of the upper gun body involved in this scheme; Figure 3 This is a 3D view of the cylinder head involved in this solution; Figure 4 This is a three-dimensional view of the upper buffer pad involved in this solution; Figure 5 This is a 3D view of the pneumatic nail puller involved in this solution. Detailed Implementation

[0016] like Figure 1As shown, an embodiment of the present invention provides a pneumatic nail puller, comprising a gun body 1 and a handle 4. The gun body 1 contains a cylinder 5, and an air storage chamber 6 exists between the two. An air inlet 1-1 is provided on the side wall of the gun body 1, connecting the air storage chamber 6 and a compressed air source. The upper end of the gun body 1 is connected to a cylinder head 7. An on / off valve assembly 9 is provided between the cylinder head 7 and the cylinder 5, and an exhaust passage 15 is provided between the on / off valve assembly 9 and the cylinder head 7. A piston rod 1 is slidably and sealingly connected inside the cylinder 5. 6. The cylinder 5 is divided into an upper air chamber 5-1 and a lower air chamber 5-2. The lower end of the piston rod 16 extends out of the gun body 1 and connects with the nail puller 17, and is slidably sealed to the gun body 1. The handle 4 is equipped with a solenoid valve 19. The solenoid valve 19, the cylinder head 7, and the gun body 1 are provided with an intermediate channel 29 that communicates with the air storage chamber 6. The intermediate channel 29 is controlled to open and close by the solenoid valve 19. In the absence of air, the moving part of the opening and closing valve assembly 9 blocks the air storage chamber 6. The upper air chamber 5-1 is connected and connected to the outside through the exhaust channel 15. The air storage chamber 6 is connected to the lower air chamber 5-2 but not to the intermediate channel 29. In the inflation state, the moving part of the opening and closing valve assembly 9 is opened by the air pressure in the air storage chamber 6, connecting the air storage chamber 6 to the upper air chamber 5-1 and closing the upper air chamber 5-1 to the exhaust channel 15. The piston rod 16 is pressed and moves to the lowest position of the cylinder 5. When the solenoid valve 19 is energized and opens the intermediate channel 29, the air pressure on the moving part of the opening and closing valve assembly 9 is balanced and the air storage chamber 6 is closed and connected to the upper air chamber 5-1 and opened to the exhaust channel 15. The piston rod 16 is pressed and moves along the axis of the cylinder 5 to the highest position of the cylinder 5 to remove the nail. The operation is convenient. The compressed air source is used as power to remove the nail instead of manpower, which reduces the labor intensity and improves the work efficiency. The nail can be pulled out vertically, which effectively avoids the nail bending and deformation, so as to facilitate recycling.

[0017] Specifically, such as Figure 1 , Figure 2 As 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, or they can be detachably fixed by other connection methods. The lower end of the upper gun body 2 is provided with a mounting bottom 2-1 around the perimeter, which cooperates with the cylinder head 7 to restrict the axial movement of the cylinder 5. The mounting bottom 2-1 is provided with multiple air inlet grooves 2-11 so that the air storage chamber 6 is connected to the lower air chamber 5-2. The lower end of the lower gun body 3 is provided with a straight tube 3-1 for the piston rod 16 to move. One side of the straight tube 3-1 is provided with a guide groove 3-11 along the moving direction. The nail puller 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 cover 18 corresponding to the nail puller 17. The setting of the safety cover 18 effectively protects the operator. When the nail is pulled out, the nail can only fall into the safety cover 18 in a restricted manner.

[0018] Furthermore, such as Figure 1 , Figure 3 , Figure 4 , Figure 5 As shown, in this embodiment, the cylinder head 7 has a first ring part 7-1 and a second ring part 7-2 arranged from the outside to the inside. The inner side of the second ring part 7-2 is provided with an inner concave annular groove 7-21. 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 multiple snap-fit ​​protrusions 10-1 corresponding to the inner concave annular groove 7-21. The diameter of the snap-fit ​​protrusions 10-1 is smaller than the maximum diameter of the concave annular groove 7-21 and larger than the minimum diameter of the concave annular groove 7-21. The upper buffer pad 10 is snapped into the concave annular groove 7-21 of the second ring part 7-2 by the snap-fit ​​protrusions 10-1, and the upper buffer pad 10 is provided with a flow groove 10-2 between adjacent snap-fit ​​protrusions 10-1 so that there is an exhaust gap 14 between the upper buffer pad 10 and the second ring part 7-2. The cylinder head 7 is provided with multiple exhaust holes 7-3 and an upper end An exhaust cover 8, an exhaust hole 7-3, and an exhaust gap 14 constitute an exhaust channel 15. The exhaust cover 8 has a through hole, through which the exhaust channel 15 communicates with the outside. At the same time, the opening and closing valve ring 11 is slidably sealed between the first ring part 7-1 and the second ring part 7-2, and is driven by the opening and closing pressure spring 12 to block the air storage chamber 6 from communicating with the upper air chamber 5-1. In the inflation state, the opening and closing valve ring 11 is pressed upward and then abuts against the upper buffer pad 10 to close the upper air chamber 5-1 from communicating with the exhaust channel 15. The opening and closing pressure spring 12 is further compressed. When the solenoid valve 19 is energized to open the intermediate channel 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 opening and closing pressure spring 12 to block the air storage chamber 6 from communicating with the upper air chamber 5-1 and open the upper air chamber 5-1 from communicating with the exhaust channel 15.

[0019] Furthermore, such as Figure 1 As shown, the opening and closing valve assembly 9 in this embodiment also includes an opening and closing valve fixing ring 13. The opening and closing valve fixing ring 13 is engaged above the cylinder 5 and cooperates with the opening and closing valve ring 11 to block the air storage chamber 6 from communicating with the upper air chamber 5-1. A protruding ring portion 13-1 is provided corresponding to the ring sleeve portion 7-1. A plurality of ventilation grooves 7-11 are provided at the lower end of the ring sleeve portion 7-1. A plurality of ventilation holes 13-2 are provided corresponding to the ventilation grooves 7-11 of the opening and closing valve fixing ring 13. 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 chamber 6 acts on the annular groove 11-1 of the opening and closing valve ring 11. The opening and closing valve ring 11 is pressed and moves upward to open the air storage chamber 6 to communicate with the upper air chamber 5-1 and close the upper air chamber 5-1 to communicate with the exhaust channel 15.

[0020] Furthermore, such as Figure 1As shown, the solenoid valve 19 in this embodiment includes a valve body 20, a valve stem 21, a spring element 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 has 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 spring element 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. 4 is fixedly connected to the valve body 20 and its output end cooperates with the valve stem 21. The electronic switch 25 is fixedly mounted on the handle 4 and is driven by the trigger 21 to transmit electrical signals 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 mounted on the handle 4 and is electrically connected to the main power switch 28. The main power switch 28 is fixedly mounted on one side of the gun body 1. Among them, the electronic switch 25 is normally open. When the trigger 23 is pulled, the controller 26 receives the electrical signal and controls the solenoid valve coil 24 to be energized. The valve stem 21 moves axially under the action of electromagnetic force to open the intermediate channel 29.

[0021] Specifically, such as Figure 1 As shown, in this embodiment, the gun body 1 is provided with channel 1-2 and channel 2-3 respectively. The cylinder head 7 is provided with channel 3-4 above the valve ring 11 corresponding to channel 2-3. The valve body 20 is provided with channel 4-20-2 and channel 5-3 communicating with the mounting cavity 20-1. Channel 4-20-2 corresponds to channel 1-2 and communicates with the gas storage cavity 6. Channel 5-3 corresponds to channel 2-3 and communicates with channel 3-4. Channel 1-2, channel 2-3, channel 3-4, channel 4-20-2, and channel 5-3 form an intermediate channel 29. The inner wall of the valve body 20 is connected to channel 4-2 and... A contact ring 20-4 is provided inward between channels 5 and 20-3. A sealing protrusion 21-1 is provided on the side wall of valve stem 21, and a mounting groove 21-2 is provided at the head. The two ends of spring member 1 22 abut against the gun body 1 and the mounting groove 21-2 respectively, and are used to seal the sealing protrusion 21-1 on valve stem 21 with the contact ring 20-4 to block the connection between channels 4 and 20-3. When valve stem 21 is driven by the adjusting component to move axially in the direction of spring member 1 22, the sealing protrusion 21-1 on valve stem 21 leaves the contact ring 20-4 to open the connection between channels 4 and 20-3.

[0022] Furthermore, such as Figure 1As shown, in this embodiment, an air compressor 30 is provided on one side of the gun body 1. The air compressor 30 can be powered by its own lithium battery or by the battery pack 27 in the control module 19. A start / stop switch 31 is provided on the air passage between the air compressor 30 and the air inlet 1-1 to start and stop the air passage between the air compressor 30 and the air inlet 1-1. The start / stop switch 31 is fixed on one side of the gun body 1. In use, the air compressor 30 fills the air storage chamber 6. When the air pressure in the air passage reaches 130 PSI, the air compressor 30 stops producing air. After one nail removal, 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. This cycle supplies air to this product. At the same time, a low-pressure protection switch 3 is also connected to one side of the gun body 1. 2. 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 then receive the electrical signal from the electronic switch 25 and control the solenoid valve coil 24 to energize and open the intermediate 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 then control the solenoid valve coil 24 to energize and open the intermediate channel 29 to pull out the nail. Both series connection methods ensure the effective action of the trigger 23.

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

[0024] Furthermore, such as Figure 1 , Figure 5 As shown, in this embodiment, the gun body 1 has an air outlet 1-4 on the lower side wall and an air outlet valve 34 at the air outlet 1-4; after the nail removal operation is completed, the air outlet valve 34 can be opened to discharge the compressed gas or liquid in the air storage chamber 6.

[0025] Meanwhile, all the sealing connections described above use sealing rings for sealing, which is simple and has a good sealing effect.

[0026] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pneumatic nail puller, characterized in that: The gun includes a gun body (1) and a handle (4). The gun body (1) contains a cylinder (5) and a gas storage chamber (6) between them. The side wall of the gun body (1) has an air inlet (1-1) that connects the gas storage chamber (6) and a compressed air source, and its upper end is connected to the cylinder head (7). An on / off valve assembly (9) is provided between the cylinder head (7) and the cylinder (5). An exhaust passage (15) is provided between the on / off valve assembly (9) and the cylinder head (7). The cylinder (5) contains a sliding seal. The piston rod (16) is sealed to divide the inner cavity of the cylinder (5) into an upper air chamber (5-1) and a lower air chamber (5-2). The lower end of the piston rod (16) passes through the gun body (1) and connects with the nail puller (17), and is slidably sealed to the gun body (1). The handle (4) is equipped with a solenoid valve (19). The solenoid valve (19), the cylinder head (7), and the gun body (1) are equipped with a middle channel (29) that communicates with the air storage chamber (6) for the moving parts of the corresponding opening and closing valve assembly (9). The intermediate channel (29) is controlled to open and close by a solenoid valve (19); in the absence of air, the movable part of the opening and closing valve assembly (9) blocks the connection between the air storage chamber (6) and the upper air chamber (5-1), the upper air chamber (5-1) is connected to the outside through the exhaust channel (15), the air storage chamber (6) is connected to the lower air chamber (5-2) and not connected to the intermediate channel (29); in the inflation state, the movable part of the opening and closing valve assembly (9) is opened by the air pressure inside the air storage chamber (6) to connect the air storage chamber (6) and the upper air chamber (5-1). The upper air chamber (5-1) is connected to the exhaust passage (15), and 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), the air pressure on the moving part of the opening and closing valve assembly (9) is balanced and the sealing of the gas storage chamber (6) is restored. The upper air chamber (5-1) is connected to the upper air chamber (5-1), and the upper air chamber (5-1) is opened to connect with the exhaust passage (15). The piston rod (16) is pressed to move to the highest position of the cylinder (5) to achieve nail removal.

2. The pneumatic nail puller according to claim 1, characterized in that: The cylinder head (7) has a ring part one (7-1) and a ring part two (7-2) arranged from the outside to the inside. 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 engaged in the ring part two (7-2) and there is an exhaust gap (14) between the upper buffer pad (10) and the ring part two (7-2). The cylinder head (7) has a plurality of exhaust holes (7-3). 7-3) and the exhaust gap (14) form an exhaust channel (15). The opening and closing valve ring (11) is slidably sealed between the first ring part (7-1) and the second ring part (7-2), and is driven by the opening and closing pressure spring (12) to block the gas storage chamber (6) from communicating with the upper gas chamber (5-1). In the inflation state, the opening and closing valve ring (11) is pressed up and then abuts against the upper buffer pad (10) to close the communication between the upper gas chamber (5-1) and the exhaust channel (15).

3. A pneumatic nail puller according to claim 2, characterized in that: The opening and closing valve assembly (9) also includes an opening and closing valve fixing ring (13). The opening and closing valve fixing ring (13) is locked above the cylinder (5) and cooperates with the opening and closing valve ring (11) to block the air storage chamber (6) from communicating with the upper air chamber (5-1). A protruding ring (13-1) is provided on the corresponding ring sleeve part (7-1). Multiple ventilation grooves (7-11) are provided at the lower end of the ring sleeve part (7-1). Multiple ventilation holes (13-2) are provided on the opening and closing valve fixing ring (13) 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).

4. A pneumatic nail puller according to claim 1, characterized in that: The solenoid valve (19) includes a valve body (20), a valve stem (21), a spring element (22), a trigger (23), and an adjustment assembly. The valve body (20) is fixed to the side wall of the gun body (1) and has an installation cavity (20-1) that communicates with the intermediate channel (29). The valve stem (21) is slidably disposed in the installation cavity (20-1) and is driven by the spring element (22) to block and close the intermediate channel (29). The trigger (23) is hinged to the handle (4) and controls the valve stem (21) to move axially to open the intermediate channel (29) through the adjustment assembly.

5. A pneumatic nail puller according to claim 4, characterized in that: 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 fixed to the valve body (20) and its output end is connected to the valve stem (21). The electronic switch (25) is fixed to the handle (4) and is driven by the trigger (21) to transmit electrical signals to the controller (26). The controller (26) is fixed to the handle (4) and is connected to the solenoid valve coil (24) and the battery pack (27) in a circuit. The battery pack (27) is fixed to the handle (4) and is connected to the main power switch (28) in a circuit. The main power switch (28) is fixed to one side of the gun body (1).

6. A pneumatic nail puller according to claim 4 or 5, characterized in that: The gun body (1) is provided with channel one (1-2) and channel two (1-3) respectively. The cylinder head (7) is provided with channel three (7-4) corresponding to the movable part of the valve closing assembly (9) and channel two (1-3). The valve body (20) is provided with channel four (20-2) and channel five (20-3) communicating with the mounting cavity (20-1). Channel four (20-2) corresponds to channel one (1-2) and communicates with the gas storage cavity (6). Channel five (20-3) corresponds to channel two (1-3) and communicates with channel three (7-4). Channel one (1-2), channel two (1-3), channel three (7-4), channel four (20-2), and channel five (20-3) constitute an intermediate channel (29). The inner wall of the valve body (20) is connected to channel four (1-2). A contact ring (20-4) is provided inward between channel 20-2 and channel 5 (20-3). The valve stem (21) has a sealing convex ring (21-1) on its side wall and a mounting groove (21-2) on its head. The two ends of the spring element (22) are respectively abutted between the gun body (1) and the mounting groove (21-2) to seal the sealing convex ring (21-1) on the valve stem (21) and the contact ring (20-4) to achieve the connection between channel 4 (20-2) and channel 5 (20-3). When the valve stem (21) is driven by the adjustment component to move axially in the direction of the spring element (22), the sealing convex ring (21-1) on the valve stem (21) leaves the contact ring (20-4) to achieve the connection between channel 4 (20-2) and channel 5 (20-3).

7. A pneumatic nail puller 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). The start / stop switch (31) is fixed on one side of the gun body (1).

8. A pneumatic nail puller according to claim 1, characterized in that: The lower end of the gun body (1) is provided with a lower buffer pad (33), which is sleeved on the piston rod (16).

9. A pneumatic nail puller according to claim 1, characterized in that: The gun body (1) has an air outlet (1-4) on the lower side wall and an air valve (34) at the air outlet (1-4).

10. A pneumatic nail puller according to claim 1, 7, 8, or 9, characterized in that: The gun body (1) is divided into a detachable upper gun body (2) and a lower gun body (3). The lower gun body (3) has a straight tube (3-1) at its lower end for the piston rod (16) to move. A guide groove (3-11) is provided on one side of the straight tube (3-1) along the moving direction. The nail puller (17) passes through the guide groove (3-11) and is connected to the lower end of the piston rod (16). A safety cover (18) is provided at the lower end of the lower gun body (3) corresponding to the nail puller (17).

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