Pneumatic nailing gun with adjustable nailing force

Abstract

The present invention provides a pneumatic nailing gun with adjustable nailing force, which belongs to the field of mechanical technology. It solves the technical problem that the nailing force adjustment accuracy of the existing pneumatic nailing gun cannot be maintained for a long time. The pneumatic nailing gun includes a shell and a firing pin. A first cylinder and a second cylinder are also provided in the shell. A first piston is provided in the first cylinder, and the first piston divides a first air chamber. A second piston is provided in the second cylinder. The firing pin is fixedly connected to the second piston, and the second piston divides a second air chamber. The first air chamber and the second air chamber are interconnected through a fully enclosed ventilation channel, so that the first air chamber, the ventilation channel and the second air chamber form a pneumatic structure that is closed relative to the outside world. An air hole that enables the pneumatic structure to maintain communication with the outside world is provided on the pneumatic structure, and a handle that can adjust the ventilation volume between the air hole and the outside world is provided on the shell. Since the air hole is a static ventilation structure, the accuracy of adjustment can be maintained for a long time.

Description

Technical Field

[0001] The invention belongs to the field of mechanical technology and relates to a pneumatic nailing gun, in particular to a pneumatic nailing gun capable of adjusting the nailing force. Background Art

[0002] A pneumatic nail gun is a tool that drives nails using high-pressure gas. Existing pneumatic nail guns are divided into single-cylinder nail guns and double-cylinder nail guns. A single-cylinder nail gun mainly drives nails by inputting high-pressure gas from an external source into a single cylinder. The external high-pressure gas is generally a high-pressure gas tank or a high-pressure gas output by a compressor. Therefore, a single-cylinder pneumatic nail gun needs to be connected to the high-pressure gas source through an air pipe and can only be moved and used near the high-pressure gas source. A double-cylinder nail gun adds a cylinder to the single cylinder to generate high-pressure gas and is driven by a built-in power source. Therefore, a double-cylinder nail gun is a portable nail gun that can be moved within any range.

[0003] The nailing force of a single-cylinder pneumatic nailing gun is regulated by setting a balancing valve in the air path between the single cylinder and the external high-pressure air source to adjust the pressure input into the single cylinder. The pressure is mainly regulated in the internal air path isolated from the outside world, and the high-pressure air source will not leak to the outside world.

[0004] The nailing force of a double-cylinder nail gun is mainly adjusted by spring force adjustment and sensor program control adjustment. The spring force adjustment structure is disclosed in a Chinese patent with publication number CN109693210A. A nail gun is provided with a spring and an adjustment knob at the piston to which the firing pin is fixed. When the piston contracts, the spring is compressed so that the spring force acts on the piston. The adjustment knob can adjust the initial position of the spring and thus change the spring force. When the piston is released, different spring forces can produce different nailing forces.

[0005] Another type of sensor program control adjustment mainly uses a number of sensors to set a preset nailing position. When the piston of the cylinder that generates high pressure with compressed gas reaches the preset position, it is sensed by the sensor and nailing is performed by program control, or the sensor senses the initial position and stroke to calculate the nailing position and nailing is performed by program control.

[0006] The above-mentioned methods for adjusting nailing force are all very effective, but they cannot maintain long-term accuracy in adjusting the accuracy of nailing force. Whether it is the spring or the sensor, the accuracy will gradually decrease in long-term use, and it is difficult to maintain long-term accuracy. Summary of the invention

[0007] The present invention aims at the above problems existing in the prior art and provides a pneumatic nailing gun, the technical problem to be solved is how to accurately adjust the nailing force over a long period of time.

[0008] The present invention is realized by the following technical scheme: a pneumatic nail gun, comprising a shell and a firing pin which can be reciprocated on the shell and used for nailing, the shell is provided with a locking member which can lock or release the firing pin, a first cylinder and a second cylinder are also provided in the shell, a first piston which can perform a compression stroke and a return stroke is provided in the first cylinder, and the first piston divides a first air chamber which can be used to store gas in the first cylinder, the first piston is driven by a motor to reciprocate linearly, a second piston which can reciprocate between a first position and a second position is provided in the second cylinder, the firing pin is fixedly connected to the second piston, the second piston divides a second air chamber in the second cylinder, and the first air chamber and the first air chamber are connected to each other. The two air chambers are interconnected through a fully enclosed ventilation channel, so that the first air chamber, the ventilation channel and the second air chamber form a pneumatic structure that is closed relative to the outside world, and it is characterized in that an air hole that can keep the pneumatic structure connected with the outside world is provided on the pneumatic structure, and a handle that can adjust the ventilation amount between the air hole and the outside world is provided on the shell. When the second piston is in the first position and the locking member locks the firing pin, the first piston performs a compression stroke to compress the gas in the air chamber, and discharges part of the compressed gas to the outside through the air hole. When the second piston is in the second position and the locking member releases the firing pin, the first piston performs a return stroke to return the second piston to the first position and is locked by the locking member, and a part of the external gas is sucked into the pneumatic structure through the air hole.

[0009] The working principle of the pneumatic nailing machine is as follows: the first air chamber, the ventilation channel and the second air chamber form a pneumatic structure. When nailing, the air holes on the pneumatic structure maintain a ventilation volume determined by the outside world when the handle is adjusted in advance. When the second piston is in the first position, the piston is retracted to the bottom of the second cylinder. Since the locking member locks the striker and the striker is fixedly connected to the second piston, the second piston is restricted to the bottom of the second cylinder and cannot move. The volume of the second air chamber is fixed, and the first piston performs a compression stroke to compress the gas in the first cylinder to generate high-pressure gas, thereby forming a high-pressure state in the entire pneumatic structure. Since the air holes remain connected to the outside world, part of the high-pressure gas is discharged from the pneumatic mechanism, so that the actual pressure value of the high-pressure gas is less than the pressure value generated by the predetermined stroke of the first piston. First, the handle is operated so that the handle can adjust the pressure value of the actual high-pressure gas in the first air chamber at different positions to achieve the adjustment of the nailing force. After the first piston completes the compression stroke, the locking piece is released, and the second piston moves at a high speed under the action of the high-pressure gas to drive the striker to nail. Then the first piston performs a return stroke. Since the pneumatic structure formed by the first air chamber, the ventilation passage and the second air chamber is closed except for the air hole, in the return stroke, the first air chamber generates a negative pressure relative to the second air chamber, and the second piston in the second cylinder is pulled back to the first position and locked by the locking piece. During the return process, the air hole remains connected to the outside world, and the pressure of the first air chamber is also less than the atmospheric pressure, so that the first air chamber is pre-filled with part of the gas, and the gas required by the first air chamber is replenished in advance. Because only a certain amount of the outside atmosphere enters the first air chamber after the air hole and the handle are matched, it is not enough to affect the negative pressure generated by the first air chamber relative to the second air chamber, and it can smooth the motor torque that gradually increases when the first piston is returned, so that the motor runs smoothly and the motor runs accurately. In addition, since the air hole is a static ventilation structure and does not move dynamically like a spring, it can maintain the accuracy of adjustment for a long time.

[0010] In the above-mentioned pneumatic nail gun, the second cylinder is coaxially arranged outside the first cylinder, and cylinder end covers that can form a seal with the cylinder body of the first cylinder and the cylinder body of the second cylinder are provided at the end of the cylinder body of the first cylinder and the end of the cylinder body of the second cylinder, thereby forming a first air chamber and a second air chamber located on the same side, and the above-mentioned ventilation channel is located in the cylinder end cover, and the above-mentioned air hole is arranged on the cylinder end cover or on the cylinder body of the first cylinder or on the cylinder body of the second cylinder, and the air hole is connected with the ventilation channel or is connected with the first air chamber or the second air chamber.

[0011] In the above-mentioned pneumatic nailing gun, the air hole is single and has a diameter of 0.5-5 mm or the air hole is multiple, and the total air flow of the multiple air holes is the same as that of a single air hole with a diameter of 0.5-5 mm.

[0012] In the above-mentioned pneumatic nail gun, the handle includes a threaded rod, which is threadedly connected to the cylinder end cover, and a blocking end is provided at the end of the threaded rod. After adjusting the handle, the blocking end can be located at different positions in the air hole, thereby changing the air output of the air hole.

[0013] In the above-mentioned pneumatic nailing gun, the handle includes a swing rod hinged on the shell, and a shielding plate is provided at the end of the swing rod. After adjusting the handle, the shielding plate can shield part of the air holes, thereby changing the air output of the air holes.

[0014] In the above-mentioned pneumatic nailing gun, the handle includes a turntable connected to the outer end of the threaded rod, a steel ball for positioning and a spring acting on the steel ball are also provided on the edge of the turntable, and a plurality of positioning holes evenly distributed in the circumferential direction are provided on the outer side of the cylinder end cover, and the steel ball abuts against the opening of one of the positioning holes under the action of the spring. When the turntable is rotated, the turntable rotates with the axial direction of the threaded rod as the center of the circle, and because the steel ball abuts against an opening under the action of the spring, during the rotation process, the steel ball will leave the original opening and enter the next opening along the trajectory and make a knocking sound to prompt the user to rotate to the next adjustment position and position it.

[0015] In the above-mentioned pneumatic nail gun, a columnar mounting seat is provided on the cylinder end cover, a threaded hole is provided in one end of the mounting seat, the air hole is provided in the other end and a vent hole is provided on the other end, the threaded rod of the handle is connected to the threaded hole through a thread, the inner end of the threaded rod extends to the air hole opening and is located between the air hole and the vent hole, and an air path connected to the vent hole is also provided in the lower half of the cylinder end cover, and the air path is connected to the outside world. This structure realizes exhaust and air intake with the outside world, and can also play a role in dust prevention.

[0016] In the above-mentioned pneumatic nail gun, the cylinder end cover includes an inner end cover and an outer end cover, the outer end cover is attached to the outer side of the inner end cover to form the above-mentioned ventilation channel between the inner end cover and the outer end cover, and the air path is arranged below the ventilation channel. Through this structure, external gas can enter the first air chamber from the lower side of the first cylinder upward, and the entering gas can be kept clean.

[0017] In the above-mentioned pneumatic nail gun, the air circuit includes a cylindrical fixing seat arranged on the outer side of the inner end cover, the above-mentioned mounting seat is inserted into the fixing seat and the fixing seat forms a seal, a ventilation groove connected to the above-mentioned vent hole is provided on the fixing seat, and a plurality of ribs are also provided outside the fixing seat on the outer side of the inner end cover, a concave cavity is formed between the ribs, and a hole connected to the outside is provided on the outer edge of the inner end cover, and the ventilation groove, the concave cavity and the hole are connected. By providing a concave cavity with a larger volume between the ventilation groove and the hole, the high-pressure gas discharged from the first air chamber can form a buffer to reduce noise.

[0018] In the above-mentioned pneumatic nail gun, a first convex portion inserted into the cylinder body of the first cylinder and sealedly connected and a second convex portion inserted into the cylinder body of the second cylinder and sealedly connected are respectively provided on the inner side surface of the inner end cover, a first through hole penetrating the inner end cover is provided on the first convex portion, a second through hole penetrating the inner end cover is provided on the second convex portion, a sealing ring is provided between the outer end cover and the inner end cover, the sealing ring encloses the first through hole and the second through hole within the sealing ring, and a groove connecting the first through hole and the second through hole is provided on the outer end cover.

[0019] Compared with the prior art, this pneumatic nail gun has the following advantages:

[0020] 1. This pneumatic nailing gun uses an air hole connected to the outside world to adjust the nailing force on the pneumatic structure. It can not only adjust the nailing force, but also smooth the gradually increasing motor torque when the first piston returns, so that the motor runs smoothly and maintains the accuracy of the motor operation. Moreover, since the air hole is a static ventilation structure and does not move dynamically like a spring, it can maintain the accuracy of adjustment for a long time.

[0021] 2. When the pneumatic nail gun exhausts and replenishes air through the air hole, air paths such as air grooves, inner cavities and holes are arranged outside the air hole, so that the exhaust is noiseless and a dust-free layer can enter the first air chamber during air replenishment, thereby maintaining long-term accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the cross-sectional structure of the pneumatic nail gun.

[0023] Figure 2 It is a partial three-dimensional exploded structural schematic diagram of the pneumatic nail gun.

[0024] Figure 3 yes Figure 2 An enlarged three-dimensional structural diagram of the cylinder end cover of a pneumatic nail gun.

[0025] Figure 4 yes Figure 1 Schematic diagram of the enlarged three-dimensional structure of part A.

[0026] Figure 5 It is a schematic structural diagram of the state of the pneumatic structure when the first piston performs a compression stroke.

[0027] Figure 6 It is a schematic structural diagram of the state of the pneumatic structure when the first piston completes the compression stroke.

[0028] Figure 7 It is a schematic diagram of the state of the pneumatic structure after nailing.

[0029] Figure 8It is a schematic structural diagram of the state of the pneumatic structure when the first piston performs a return stroke.

[0030] Fig. 9 It is a schematic structure showing that the state of the pneumatic structure returns to the initial state after the first piston completes the return stroke.

[0031] In the figure, 1, housing; 2, striker; 3, locking member; 4, first cylinder; 41, first piston; 411, piston rod; 42, first air chamber; 5, second cylinder; 51, second piston; 52, second air chamber; 6, motor; 61, gear reducer; 7, air hole; 71, vent hole; 8, ventilation channel; 9, cylinder end cover; 91, inner end cover; 911, first convex portion; 912, second convex portion; 913, first through hole; 914, first through hole; 915, sealing ring; 916, fixing seat; 917, ventilation groove; 918, rib; 95, cavity; 919, hole; 92, outer end cover; 921, groove; 922, positioning hole; 93, air path; 94, mounting seat; 10, battery; 11, motor control board; 12, button; 13, nail box; 14, handle; 141, threaded rod; 142, turntable; 143, steel ball; 144, spring. DETAILED DESCRIPTION

[0032] The present invention will be further described below in the form of embodiments in conjunction with the accompanying drawings.

[0033] Embodiment 1:

[0034] like Figure 1As shown, a pneumatic nail gun comprises a housing 1, a striker 2 which can reciprocate and is arranged on the housing 1 for nailing, and a locking member 3 which can lock or release the striker 2 is arranged on the housing 1, wherein the locking member 3 has a locking hook, and a slot is arranged on the side of the striker 2. When in a locked state, the locking hook is stuck in the slot to keep the striker 2 in a locked state and cannot move. A first cylinder 4 and a second cylinder 5 are also arranged in the housing 1, wherein a first piston 41 which can perform a compression stroke and a return stroke is arranged in the first cylinder 4, and the first piston 41 divides a first air chamber 42 which can be used to store gas in the first cylinder 4, a piston rod 411 is connected to the first piston 411, and a crank 412 is connected to the piston rod 411, and a motor 6 arranged in the housing 1 is connected to a gear reducer 61, and an output shaft of the gear reducer 61 is connected to the crank 412, and the piston rod 411 and the crank 412 form a crank-connecting rod structure, which changes the rotational power of the motor 6 into the power to drive the first piston 41 to perform linear reciprocating movement. A second piston 51 is provided in the second cylinder 5 and can reciprocate between a first position and a second position. The first position is the position where the striker 2 is locked so that the second piston 51 is located, and the second position is the position where the striker is nailed. The striker 2 is fixedly connected to the second piston 51. The second piston 51 divides a second air chamber 52 in the second cylinder 5. The first air chamber 42 and the second air chamber 52 are interconnected through a fully enclosed ventilation channel 8, so that the first air chamber 42, the ventilation channel 8 and the second air chamber 52 form a pneumatic structure that is closed relative to the outside. A detachable battery 10 is also provided at the lower end of the grip portion of the housing 1. The battery 10 supplies power to the motor control board 11. A button 12 is also provided at the lower end of the grip portion of the housing 1. The button 12 is also connected to the motor control board 11. After pressing the button 12, the motor control board 11 controls the motor 6 to drive the first piston 41 to perform a compression stroke and a return stroke. A nail box 13 is provided at the front end of the housing 1. The nails in the nail box 13 will automatically rise to the front of the striker 2 under the action of the spring. After the first piston 41 completes the compression stroke, the unlocking mechanism removes the lock hook from the slot of the striker 2, so that the striker 2 and the second piston 51 are both in the unlocked state. The second piston 51 moves at high speed under the action of high pressure, driving the striker 2 to hit the nail in front of the striker 2, completing a nailing action. After that, the first piston 41 performs a return stroke, and under the action of negative pressure, the second piston 51 returns from the first position to the second position, and the lock hook re-locks the striker 2. If the reciprocating cycle is repeated, continuous nailing is achieved.

[0035] Combination Figure 1 ,like Figure 2 As shown, Figure 2It is a three-dimensional exploded view of the pneumatic nail gun. The second cylinder 5 is located above the first cylinder 4, and the first cylinder 4 and the second cylinder 5 are coaxially arranged in parallel. The cylinder end of the first cylinder 4 and the end of the cylinder body of the second cylinder 5 are provided with a cylinder end cover 9 that can form a seal with the cylinder body of the first cylinder 4 and the cylinder body of the second cylinder 5. The end cover of the first cylinder 4 and the second cylinder 5 is the same cylinder end cover 9, which is installed on one side of the first cylinder 4 and the second cylinder 5, so as to form a first air chamber 42 and a second air chamber 52 located on the same side, and the ventilation channel 8 is located in the cylinder end cover 9. The cylinder end cover 9 includes an inner end cover 91 and an outer end cover 92. The inner side surface of the inner end cover 91 is respectively provided with a first convex portion 911 inserted into the cylinder body of the first cylinder 4 and sealedly connected, and a second convex portion 912 inserted into the cylinder body of the second cylinder 5 and sealedly connected. The first convex portion 911 is provided with a first through hole 913 penetrating the inner end cover 91, and the second convex portion 912 is provided with a second through hole 914 penetrating the inner end cover 91. A sealing ring 915 is provided between the outer end cover 92 and the inner end cover 91. The sealing ring 915 encloses the first through hole 913 and the second through hole 914 in the sealing ring 915, and a groove 921 connecting the first through hole 913 and the second through hole 914 is provided on the inner side surface of the outer end cover 92. Through this structure, the outer end cover 92 is attached to the outer side of the inner end cover and fixed to the cylinder body of the first cylinder 4 and the cylinder body of the second cylinder 5 by bolts. After the inner end cover 91 and the outer end cover 92 are fixed and attached, the above-mentioned ventilation channel 8 is formed between the inner end cover 91 and the outer end cover 92.

[0036] like Figure 3 and Figure 4As shown, a single air hole 7 connected to the air passage 8 is provided on the cylinder end cover 9, and the aperture of the air hole 7 is 0.5-5 mm. A handle 14 capable of adjusting the ventilation volume between the air hole 7 and the outside is provided on the housing 1. The handle 14 comprises a threaded rod 141, and the threaded rod 141 is threadedly connected to the cylinder end cover 9. The inner end of the threaded rod 141 is a blocking end. After adjusting the handle, the blocking end can be located at different positions in the air hole 7 to change the air volume of the air hole 7. As a replaceable structure, the air hole 7 can be set on the cylinder body of the first cylinder 4 or the cylinder body of the second cylinder 5, and the air hole 7 is connected to the first air chamber 42 or the second air chamber 52. The number of air holes 7 can also be replaced by multiple, and the total ventilation volume of the multiple air holes is the same or similar to that of a single air hole with an aperture of 0.5-5 mm. In order to increase the strength, a columnar mounting seat 94 made of metal copper or other materials is provided on the inner end cover 91 and the outer end cover 92 of the cylinder end cover 9. The mounting seat 94 is embedded in the cylinder end cover 9 made of plastic. A threaded hole is provided in one end of the mounting seat 94. The air hole 7 is provided in the other end and a vent hole 71 is provided on the other end. The threaded rod 141 of the handle 14 is connected to the threaded hole by threading. The inner end of the threaded rod 141 extends to the opening of the air hole 7 and is located between the air hole 7 and the vent hole 71. The handle 14 includes a rotating disk 142 connected to the outer end of the threaded rod 141. A steel ball 143 for positioning and a spring 144 acting on the steel ball 143 are also provided on the edge of the rotating disk 142. A plurality of positioning holes 922 evenly distributed in the circumferential direction are provided on the outer side surface of the cylinder end cover 9. The steel ball 143 abuts against the opening of one of the positioning holes 922 under the action of the spring 144. The turntable 142 rotates with the axial direction of the threaded rod 141 as the center. Since the steel ball 143 is pressed against an orifice under the action of the spring 144, the steel ball 143 will break away from the original orifice and enter the next orifice along the trajectory during the rotation, making a knocking sound to prompt the user to rotate to the next adjustment position and position it.

[0037] The air hole 7 keeps the pneumatic structure connected with the outside through the air path 93 arranged in the cylinder end cover 9. The air path 93 is arranged in the lower half of the cylinder end cover 9 and below the ventilation channel 8. Specifically, the air path 93 includes a cylindrical fixing seat 916 arranged on the outer side of the inner end cover 91, the mounting seat 94 is inserted in the fixing seat 916 and forms a seal with the fixing seat 916, a ventilation groove 917 connected with the air hole 71 is arranged on the fixing seat 916, and a plurality of ribs 918 are arranged outside the fixing seat 916 on the outer side of the inner end cover 91, and a concave cavity 95 is formed between the ribs 918. A hole 919 connected with the outside is arranged on the outer edge of the inner end cover 91, and the ventilation groove 917, the concave cavity 95 and the hole 919 are connected.

[0038] The working process of the present invention is as follows Figure 5-Figure 9 As shown, the first air chamber 42, the ventilation channel 8 and the second air chamber 52 form a pneumatic structure. Figure 1 The positions of the first piston 41 and the second piston 51 shown are in the initial state. When the handle 14 is pre-adjusted, the air hole 7 on the pneumatic structure maintains a certain ventilation volume with the outside world, and the second piston 51 is located in the first position, that is, the first piston 51 is retracted at the bottom of the second cylinder 5, and the locking member 3 with a locking hook locks the striker 2.

[0039] like Figure 5 As shown, the first piston 41 performs a compression stroke, compressing the gas in the first cylinder 4 to generate high-pressure gas, thereby forming a high-pressure state in the entire pneumatic structure. Since the air hole 7 is connected to the outside through the air path 93, part of the high-pressure gas is discharged to the outside through the ventilation groove 917, the cavity 95 and the hole 919, so that the actual pressure value of the high-pressure gas is less than the pressure value generated by the predetermined stroke of the first piston 41, so as to realize the adjustment of the nailing force.

[0040] like Figure 6 and 7 As shown, after the first piston 41 completes the compression stroke, the locking hook is moved out of the slot of the firing pin 2 by the unlocking mechanism, the locking member 3 is in a released state, the firing pin 2 and the second piston 51 are both in an unlocked state, and the second piston 51 moves at a high speed under the action of high pressure, driving the firing pin 2 to hit the nail in front of the firing pin 2, completing a nailing action. At this time, the second piston 51 is in the second position.

[0041] like Figure 8 As shown, the first piston 41 performs a return stroke. Since the pneumatic structure formed by the first air chamber 42, the ventilation passage 8 and the second air chamber 52 is closed except for the air hole 7, during the return stroke, the first air chamber 42 generates a negative pressure relative to the second air chamber 52, and the second piston 51 in the second cylinder 5 moves to the first position. During the return process, the air hole 7 remains connected to the outside world, and the pressure of the first air chamber 42 is also less than the atmospheric pressure, so that the first air chamber 42 is pre-filled with part of the gas through the ventilation groove 917, the concave cavity 95 and the hole 919, and the gas required by the first air chamber 42 is replenished in advance. Because only a certain amount of the outside atmosphere enters the first air chamber 42 after the air hole and the handle are matched, it is not enough to affect the negative pressure generated by the first air chamber 42 relative to the second air chamber 52, and it can smooth the torque of the motor 6 that gradually increases when the first piston 41 returns, so that the motor 6 runs smoothly and the motor 6 runs accurately.

[0042] like Fig. 9 As shown, when the first piston 41 returns to the initial position, the second piston 51 also returns to the first position under the action of negative pressure, and the locking member 3 re-locks the striker to complete a nailing cycle.

[0043] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A pneumatic nail gun, comprising a housing (1) and a firing pin (2) disposed on the housing (1) and capable of reciprocating for nailing, the housing (1) being provided with a locking member (3) capable of locking or releasing the firing pin (2), a first cylinder (4) and a second cylinder (5) being further disposed in the housing (1), a first piston (41) capable of performing a compression stroke and a return stroke being disposed in the first cylinder (4), and the first piston (41) dividing a first air chamber (42) in the first cylinder (4) capable of storing gas, the first piston (41) The second cylinder (5) is driven by a motor (6) to move back and forth in a straight line. A second piston (51) capable of moving back and forth between a first position and a second position is provided in the second cylinder (5). The striker (2) is fixedly connected to the second piston (51). The second piston (51) divides a second air chamber (52) in the second cylinder (5). The first air chamber (42) and the second air chamber (52) are connected to each other through an air passage (8), so that the first air chamber (42), the air passage (8) and the second air chamber (52) form a pneumatic structure that is closed relative to the outside. It is characterized in that The pneumatic structure is provided with an air hole (7) capable of maintaining communication between the pneumatic structure and the outside world, and the housing (1) is provided with a handle (14) capable of adjusting the ventilation volume between the air hole (7) and the outside world. When the second piston (51) is located at the first position and the locking member (3) locks the striker (2), the first piston (41) performs a compression stroke to compress the gas in the first air chamber (42), and discharges part of the compressed gas to the outside world through the air hole (7). When the second piston (51) is located at the second position and the locking member (3) releases the striker (2), the first piston (41) performs a return stroke to return the second piston (51) to the first position and is locked by the locking member (3), and a part of the outside gas is sucked into the pneumatic structure through the air hole (7).

2. The pneumatic nail gun according to claim 1, It is characterized in that The second cylinder (5) is coaxially arranged outside the first cylinder (4) in parallel, and a cylinder end cover (9) capable of forming a seal with the cylinder body of the first cylinder (4) and the cylinder body of the second cylinder (5) is provided at the cylinder end of the first cylinder (4) and the cylinder end of the second cylinder (5). The ventilation passage (8) is located in the cylinder end cover (9), and the air hole (7) is provided on the cylinder end cover (9) or on the cylinder body of the first cylinder (4) or on the cylinder body of the second cylinder (5). The air hole (7) is connected to the ventilation passage (8) or is connected to the first air chamber (42) or the second air chamber (52).

3. The pneumatic nail gun according to claim 2, It is characterized in that The pore (7) is single and has a pore diameter of 0.5 to 5 mm, or the pore (7) is multiple.

4. The pneumatic nailing gun according to claim 2 or 3, It is characterized in that The handle (14) comprises a threaded rod (141), the threaded rod (141) is connected to the cylinder end cover (9) by threads, the inner end of the threaded rod (141) is a blocking end, and after adjusting the handle (14), the blocking end can be located at different positions and block the air hole (7), thereby changing the air output of the air hole (7).

5. The pneumatic nail gun according to claim 1, 2 or 3, It is characterized in that The handle (14) comprises a swing rod hinged on the housing (1), and a shielding plate is provided at the end of the swing rod. After adjusting the handle (14), the shielding plate can shield part of the air hole (7), thereby changing the air output of the air hole (7).

6. The pneumatic nail gun according to claim 4, It is characterized in that The handle (14) comprises a rotating disk (142) fixedly connected to the outer end of the threaded rod (141), a steel ball (143) for positioning and a spring (144) acting on the steel ball (143) are also provided on the rotating disk (142), and a plurality of positioning holes (922) evenly distributed in the circumferential direction are provided on the outer side surface of the cylinder end cover (9), and the steel ball (143) is pressed against the opening of one of the positioning holes (922) under the action of the spring (144).

7. The pneumatic nail gun according to claim 6, It is characterized in that The cylinder end cover (9) is provided with a columnar mounting seat (94), a threaded hole is provided in one end of the mounting seat (94), the air hole (7) is arranged in the other end and a vent hole (71) is provided on the other end, the threaded rod (141) of the handle (14) is connected to the threaded hole through a thread, the inner end of the threaded rod (141) extends to the opening of the air hole (7) and is located between the air hole (7) and the vent hole (71), and an air path (93) connected to the vent hole (71) is also provided in the lower half of the cylinder end cover (9), and the air path (93) is connected to the outside.

8. The pneumatic nail gun according to claim 7, It is characterized in that The cylinder end cover (9) comprises an inner end cover (91) and an outer end cover (92), wherein the outer end cover (92) is attached to the outer side surface of the inner end cover (91) so that the ventilation channel (8) is formed between the inner end cover (91) and the outer end cover (92), and the gas path (93) is arranged below the ventilation channel (8).

9. The pneumatic nail gun according to claim 8, It is characterized in that The air path (93) comprises a cylindrical fixing seat (916) arranged on the outer side of the inner end cover (91), the mounting seat (94) is inserted into the fixing seat (916) and forms a seal with the fixing seat (916), a ventilation groove (917) connected to the ventilation hole (71) is provided on the fixing seat (916), and a plurality of ribs (918) are further provided outside the fixing seat (916) on the outer side of the inner end cover (91), a concave cavity (95) is formed between the ribs (918), and a hole (919) connected to the outside is provided on the outer edge of the inner end cover (91), and the ventilation groove (917), the concave cavity (95) and the hole (919) are connected.

10. The pneumatic nail gun according to claim 9, It is characterized in that A first convex portion (911) inserted into the cylinder body of the first cylinder (4) and sealed therein and a second convex portion (912) inserted into the cylinder body of the second cylinder (5) and sealed therein are respectively provided on the inner side surface of the inner end cover (91), a first through hole (913) penetrating the inner end cover (91) is provided on the first convex portion (911), a second through hole (914) penetrating the inner end cover (91) is provided on the second convex portion (912), a sealing ring (915) is provided between the outer end cover (92) and the inner end cover (91), the sealing ring (915) encloses the first through hole (913) and the second through hole (914) within the sealing ring (915), and a groove (921) communicating the first through hole (913) and the second through hole (914) is provided on the outer end cover (92).

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