TWI734417B - Pneumatic structure of pneumatic nail gun - Google Patents

Abstract

The present invention provides an air circuit structure of a pneumatic nail gun, which includes a main air chamber forming a high-pressure air in a gun body, a disc-shaped piston air chamber, and a delay air chamber that continuously releases high-pressure air to the atmosphere. The gun body is provided with There is a trigger valve and a slide rod valve. A safety air chamber and an auxiliary air chamber are formed in the trigger valve. The trigger valve controls the high-pressure air in the disc-shaped piston air chamber to discharge to the outside. The slide rod valve controls the high-pressure air flow in the main air chamber. To the disc-shaped piston air chamber, the delay air chamber and the auxiliary air chamber, the safety air chamber is constantly connected to the main air chamber and collects high-pressure air. The slide valve can control the high-pressure air in the auxiliary air chamber to be discharged to the outside, as well as through a trigger Restrict and control the high-pressure air in the auxiliary air chamber to the delay air chamber; thereby improving the safety of the traditional pneumatic nail gun.

Description

Pneumatic structure of pneumatic nail gun

The invention relates to the structure configuration of a pneumatic nail gun, and particularly relates to a pneumatic structure of a pneumatic nail gun.

The pneumatic nail gun is a pneumatic hand tool that relies on high-pressure air as a power source to drive the piston down to drive the nail and move up and reset. Generally, according to the safety operation sequence when the user uses the pneumatic nail gun to strike nails, it can be divided into two types: sequential actuation mode and contact actuation mode. Among them:

Sequential operation mode refers to the mode in which the user must first touch the work object to be nailed with the percussion seat on the safety slide or rod, and then press the trigger to activate the trigger valve for nailing. In this mode, whenever the user wants to strike the nail again, he must follow the sequence of releasing the trigger first and then repeatedly pressing the trigger before he can strike the nail again. When the user violates this operation sequence, that is, first presses the trigger and then presses the safety slide bar or the percussion seat on the lever, the trigger valve cannot be activated, thereby inhibiting the pneumatic nail gun from striking the nails. It can be seen that the sequential operation mode can ensure the safety of the user when operating the pneumatic nail gun.

Knock operation mode means that the user first presses and pulls the trigger continuously, and then moves the safety slide bar or the percussion seat on the rod toward the position of the work object to be stapled for continuous contact percussion, and the trigger valve is activated successively , Carry out continuous contact nailing operation. In this mode, the user is also allowed to press and hold the percussion seat on the safety slide or rod on the work object to be nailed first, and then perform a single or continuous triggering action to facilitate the work object to be nailed. Single or multiple nails. It can be seen from this that, although the percussion operation mode can provide the user with convenience when operating the pneumatic nail gun to continuously nail multiple nails, it is more prone to the danger of accidentally striking the nails than the sequential operation mode.

In addition, in order to switch the two nailing modes of the sequence operation and the knocking operation in the traditional pneumatic nail gun, a manual switching valve stem is provided on the pneumatic nail gun to facilitate the user to switch the nailing mode for nailing. However, the switching device easily increases the structural complexity of the pneumatic nail gun (including the gas path), and the manual switching valve stem is no longer in compliance with the newer gun safety rules.

More specifically, the newer safety rules for gun use have tended to regulate that the pneumatic nail gun must be limited to start operation in the sequence mode at the beginning of the start, that is, the user must first press the safety slide (or the percussion seat on the rod). On the work object to be nailed, the trigger can be pressed to start a single nailing, and the start timing of the nailing mode of the hammering operation is further regulated through the action of the safety slide bar to improve the safety of the gun; but as of now , The industry’s technology is immature.

The purpose of the present invention is to improve the gun safety of traditional pneumatic nail guns, especially under the premise of complying with the newer gun safety regulations, eliminating the traditional sequence/percussion manual switch valve stem configuration, the present invention In particular, the sliding action of the safety rod is used as the starting point of control, and the habit of using the gun of the matching user is used to switch between the more secure sequence mode and the striking mode of the nail mode. In addition, the present invention is also equipped with a safety mechanism that can automatically return to the sequence mode when the nail gun is placed over time, so as to improve the safety of the gun.

To this end, the present invention provides an air circuit structure of a pneumatic nail gun, including: a gun body with a main air chamber for gathering high-pressure air, a disc-shaped piston air chamber, and a delay for continuously releasing high-pressure air to the atmosphere. Air chamber; a trigger valve, set on the gun body, the trigger valve includes a shuttle valve ring, a trigger valve stem, a safety air chamber and an auxiliary air chamber, the shuttle valve ring is slidably set on the trigger valve On the rod, the two ends of the shuttle valve ring are respectively exposed in the safety air chamber and the main air chamber, and the shuttle valve ring extends through the auxiliary air chamber, and the high-pressure air in the safety air chamber forms a first Thrust, the high-pressure air in the main air chamber forms a second thrust, the high-pressure air in the auxiliary air chamber forms a third thrust, the first thrust, the second thrust and the third thrust respectively act on the shuttle valve ring Up, and the second thrust and the third thrust are respectively the same as the first thrust In the opposite direction, the trigger valve controls the high-pressure air in the disc-shaped piston air chamber to be discharged to the gun body through the shuttle valve ring and the trigger valve rod, and the gun body is also equipped with a trigger for pressing the trigger valve rod; A slide rod valve is arranged on the gun body, the slide rod valve includes a safety slide rod, the safety slide rod extends through the trigger, the slide rod valve controls the high-pressure air flow in the main air chamber through the safety slide rod To the disc-shaped piston air chamber, the delay air chamber and the auxiliary air chamber; wherein the safety air chamber is constantly connected to the main air chamber and collects high-pressure air, and the safety slide rod is displaced along its axial direction to a bottom position, The slide rod valve can control the high-pressure air in the auxiliary air chamber to be discharged to the outside of the gun, so that the sum of the third thrust and the second thrust is less than the first thrust, and then drives the shuttle valve ring to move to a safety open position ; The safety slide rod is displaced along its axial direction to a top position, so that the slide rod valve can control the high-pressure air in the main air chamber to the auxiliary air chamber, so that the third air is formed by gathering high-pressure air in the auxiliary air chamber The sum of the thrust and the second thrust is greater than the first thrust, and then drives the shuttle valve ring to move from the safety open position to a safety closed position; the safety slide bar is displaced to an intermediate position by the restraint of the trigger, the The middle position is located between the bottom position and the top position, so that the high-pressure air in the auxiliary air chamber is continuously released into the atmosphere through the delay air chamber, so that the combined force of the third thrust and the second thrust is gradually smaller than the first thrust. A thrust force further drives the shuttle valve ring to move from the safety closed position to the safety open position.

In a further implementation, an air inlet runner is formed in the gun body, and both ends of the air inlet runner extend to the main air chamber and the safety air chamber respectively, and the high-pressure air in the main air chamber passes through the air inlet runner To the safe air chamber.

In a further implementation, the trigger valve further includes a trigger valve seat. The trigger valve seat is located at the bottom of the trigger valve and is assembled on the gun body. The trigger valve stem extends through the shuttle valve ring and The trigger valve seat, the safety air chamber are formed between the shuttle valve ring and the trigger valve seat, and the auxiliary air chamber is formed between the gun body and the shuttle valve ring. The shuttle valve ring has a first end surface, a second end surface, and a third end surface, the first end surface is exposed in the safety air chamber, the second end surface is exposed in the main air chamber, and the third end surface Exposed in the auxiliary air chamber, the first end surface has a thrust area that can contact high-pressure air is relatively larger than the second end surface, and the second end surface The sum of the thrust area with which the third end surface can contact the high-pressure air is relatively larger than the first end surface. A trigger valve first valve part, a trigger valve second valve part, and a trigger valve third valve part are formed between the shuttle valve ring and the trigger valve stem. The ring wall of the shuttle valve ring includes a connection formed thereon. The first through hole that communicates with the slide rod valve, a second through hole that communicates with the atmosphere, a third through hole that communicates with the slide rod valve, and a fourth through hole that communicates with the slide rod valve. The first valve portion of the trigger valve is used to block The first perforation is in communication with the main air chamber, the second valve portion of the trigger valve can control the timing of communication between the first perforation and the second perforation, and the third valve portion of the trigger valve can control the timing of the communication between the third perforation and the third perforation. The timing of communication between the fourth perforations. The first valve portion of the trigger valve, the second valve portion of the trigger valve, and the third valve portion of the trigger valve are respectively formed in sequence between the shuttle valve ring and the trigger valve stem along the axial direction of the shuttle valve ring, The first through hole, the second through hole, the third through hole and the fourth through hole are respectively formed on the ring wall of the shuttle valve ring in sequence along the axial direction of the shuttle valve ring.

In a further implementation, the slide rod valve includes a slide rod valve chamber, the safety slide rod slide assembly is in the slide rod valve chamber, one end of the safety slide rod protrudes to the outside of the gun, and the other of the safety slide rod One end is implanted in the main air chamber. A first valve part of a slide rod valve, a second valve part of a slide rod valve and a third valve part of a slide rod valve are formed between the slide rod valve chamber and the safety slide rod. The wall surface includes a first flow path communicating with the disc-shaped piston air chamber, a second flow path communicating with the trigger valve, a third flow path communicating with the atmosphere, a fourth flow path communicating with the delay air chamber, A fifth flow path communicating with the trigger valve and a sixth flow path communicating with the main air chamber, the first valve part of the slide valve can control the timing of communication between the main air chamber and the first flow path, and control The timing of the communication between the second flow passage, the third flow passage, the fourth flow passage and the fifth flow passage, the first valve part of the slide valve can simultaneously control the first flow passage and the second flow passage The second valve part of the slide rod valve can control the communication timing between the fourth flow passage and the fifth flow passage, and the third valve part of the slide rod valve can control the fourth flow passage and the fifth flow passage. The timing of the communication between the fifth flow channel and the sixth flow channel. The first valve part of the slide rod valve, the second valve part of the slide rod valve, and the third valve part of the slide rod valve are respectively formed in the slide rod valve chamber and the safety along the axial direction of the slide rod valve chamber. Between the slide bars, the first flow channel, the second flow channel, the third flow channel, the fourth flow channel, the fifth flow channel and the first flow channel Six flow channels are respectively formed on the wall surface of the slide rod valve chamber in sequence along the axial direction of the slide rod valve chamber.

In a further implementation, the trigger is formed with an opening through which the safety slide bar can penetrate, the safety slide bar is formed with a stopper, and the safety slide bar receives the restraint of the trigger via the stopper. The outer diameter of the blocking portion is relatively larger than the aperture of the opening.

In a further implementation, a pressure relief hole connected to the delay air chamber is formed on one side of the gun body, and the high-pressure air in the delay air chamber is continuously released into the atmosphere through the pressure relief hole. The cross-sectional area of the delay gas chamber is relatively larger than the pressure relief hole. One side of the gun body is also formed with an exhaust hole communicating with the delay air chamber and a pressure rod for controlling the exhaust hole to communicate with the atmosphere, and the cross-sectional area of the exhaust hole is relatively larger than the pressure relief hole.

According to the above, the technical effects of the present invention are: whether the pneumatic nail gun is used for the first time or when the safety slide bar is not pressed within a certain period of time, and when the nailing operation is performed, the trigger is released and used Everyone must press the safety slide bar before starting the nailing operation, which improves the safety of the pneumatic nail gun and reduces the structural complexity of the pneumatic nail gun due to the elimination of the switching device.

The features and technical effects of the various embodiments disclosed herein will be presented in the following description and illustrations.

10: Gun body

11: Main air chamber

12: Cylinder

121: Top cylinder chamber

122: bottom cylinder chamber

13: Nail Piston

14: Disc piston

141: Disc piston air chamber

15: intake runner

20: Trigger valve

21: Shuttle valve ring

21a: The first end face

21b: second end face

21c: The third end face

21d: Insurance opening position

21e: Insurance closed position

211: First Piercing

212: second perforation

213: Third Piercing

214: Fourth Piercing

22: Trigger valve seat

221: Through Hole

23: Insurance air chamber

24: auxiliary air chamber

25: Trigger stem

261: Trigger valve first valve part

262: Trigger valve second valve part

263: Trigger valve third valve part

27a, 27b, 27c, 27d: air stop washer

28: Trigger

281: open hole

30: Slide valve

31: Sliding rod valve chamber

311: first runner

312: second runner

313: third runner

314: fourth runner

315: Fifth runner

316: Sixth Runner

32: safety slide

32a: bottom position

32b: middle position

32c: Top position

321: Block

331: The first valve part of the slide valve

332: The second valve part of the slide valve

333: The third valve part of the slide valve

34a, 34b, 34c, 34d: air stop washer

40: Delay air chamber

41: Pressure relief hole

42: Vent

43: pressure bar

F ₁ : First thrust

F ₂ : Second thrust

F ₃ : Third thrust

Figure 1 is a cross-sectional view illustrating a pneumatic nail gun according to the present invention.

Fig. 2 is a schematic configuration diagram of an embodiment of the air path structure of the pneumatic nail gun of the present invention.

Fig. 2a and Fig. 2b are respectively partial enlarged schematic diagrams of Fig. 2.

Figures 3 to 8 are successively explanatory diagrams of the continuous action when the safety slide bar is pressed first and then the trigger valve stem is pressed.

Figures 9 to 10 are successively explanatory diagrams of the continuous action when the safety slide bar is not pressed and the trigger valve stem is released during the nailing process.

Figures 11 to 12 are successively explanatory diagrams of the continuous action when the trigger valve stem is pressed first and then the safety slide bar is pressed.

Please refer to FIGS. 1 and 2 together to disclose the configuration details of the first embodiment of the present invention, and illustrate the gas circuit structure of the pneumatic nail gun of the present invention, including a gun body 10, a trigger valve 20 and a slide valve 30 ,in:

The gun body 10 is equipped with a cylinder 12 inside, and a nailing piston 13 is provided in the sliding group of the cylinder 12. The nailing piston 13 divides the inside of the cylinder 12 to form a top cylinder chamber 121 and a bottom cylinder chamber 122 with variable volumes; the top of the cylinder 12 is movably configured with a disc valve or firing valve ) 14. The disc-shaped piston 14 does not have to be in the form of a disc. For example, the piston is made into a rectangular or other shape; specifically, as long as it is used to control the high-pressure air in the gun body 10 from entering the cylinder 12 The timing of the inner (including the top cylinder chamber 121 or the bottom cylinder chamber 122), and the piston used to drive the nailing piston 13 to fire the nails in a timely manner, all belong to the disc piston 14 described in the present invention. A disc-shaped piston air chamber 141 is formed on the top of the disc-shaped piston 14, and a main air chamber 11 that can contain high-pressure air and collects pressure is formed in the gun body 10. The main air chamber 11 surrounds the cylinder 12 and the disc-shaped piston 14 The gun body 10 is also formed inside a delay air chamber 40, the delay air chamber 40 can continue to release high-pressure air into the atmosphere.

Please refer to Figures 2 and 2a together, it is explained that the trigger valve 20 is arranged on the gun body 10. The trigger valve 20 includes a shuttle valve ring 21, a trigger valve seat 22 and a trigger valve stem 25, wherein the trigger valve The seat 22 is located at the bottom of the trigger valve 20 and is assembled on the gun body 10. A through hole 221 is formed at the bottom of the trigger valve seat 22. One end of the trigger valve stem 25 extends through the trigger valve through the through hole 221. The seat 22 is exposed outside the gun body 10, and the shuttle valve ring 21 is slidably assembled on the other end of the trigger valve stem 25. The two ends of the shuttle valve ring 21 are respectively exposed in the main air chamber 11 and a safety air chamber 23. The safety air chamber 23 is formed between the shuttle valve ring 21 and the trigger valve seat 22, and the shuttle valve The ring 21 extends through an auxiliary air chamber 24 formed between the gun body 10 and the shuttle valve ring 21. In practice, the shuttle valve ring 21 is driven by the high-pressure air in the main air chamber 11, the safety air chamber 23 and the auxiliary air chamber 24 to move along the axial direction of the trigger valve stem 25, so that the shuttle valve The ring 21 can control the disc-shaped piston air chamber 141 The high-pressure air is discharged to the outside of the gun body 10. The gun body 10 is provided with a trigger 28, and the trigger 28 is arranged on the gun body 10. The so-called configuration means that the trigger 28 can be arranged on the gun body 10 in a pivotal or sliding manner; in this embodiment, For example, the trigger 28 is configured in a pivoting manner; in detail, one end of the trigger 28 is pivoted on the gun body 10, and the other end of the trigger 28 contacts the trigger valve stem 25, so that the user's fingers can pass the trigger 28 presses the trigger valve stem 25; furthermore, an opening 281 is formed on the trigger 28. In addition, an intake runner 15 is formed in the gun body 10, and the two ends of the intake runner 15 respectively extend to the main air chamber 11 and the safety air chamber 23, so that the high-pressure air in the main air chamber 11 passes through under normal conditions. The intake runner 15 continuously introduces the safety air chamber 23 so that high-pressure air is constantly collected in the safety air chamber 23.

Furthermore, the shuttle valve ring 21 has a first end surface 21a, a second end surface 21b, and a third end surface 21c. The third end surface 21c is located between the first end surface 21a and the second end surface 21b. The first end surface 21 a is exposed in the safety air chamber 23, the second end surface 21 b is exposed in the main air chamber 11, and the third end surface 21 c is exposed in the auxiliary air chamber 24. The shuttle valve ring 21 can be driven by the high-pressure air in the safety air chamber 23 via the first end face 21a to move along the axial direction of the trigger valve stem 25 to a safety opening position 21d, or can receive the main air chamber via the second end face 21b The drive of the high-pressure air in 11 and the drive of the high-pressure air in the auxiliary air chamber 24 via the third end surface 21c moves along the axial direction of the trigger stem 25 to a safety closed position 21e.

In specific implementation, the high-pressure air in the safety air chamber 23 forms a first thrust F ₁ , the high-pressure air in the main air chamber 11 forms a second thrust F ₂ , and the high-pressure air in the auxiliary air chamber 24 forms a The third thrust F ₃ , the first thrust F ₁ , the second thrust F ₂ and the third thrust F ₃ respectively act on the shuttle valve ring 21, and the second thrust F ₂ and the third thrust F ₃ are respectively the same as the first thrust F 2 and the third thrust F 3 The direction of a thrust F _{1 is opposite.} Wherein the first force F ₁ acting on the first end surface 21a, the second force F ₂ is acting on the second end face 21b, the third force F ₃ is applied to the third end face 21c, the first The end face 21a has a thrust area that can contact high-pressure air is relatively larger than the second end face 21b, and the sum of the third end face 21c and the second end face 21b has a thrust area that can contact high-pressure air is relatively larger than the first The end face 21a has a thrust area capable of contacting high-pressure air; that is to say, since the main air chamber 11 and the safety air chamber 23 are constantly connected, the safety air chamber 23 is constantly assembled with the same high-pressure air thrust as the main air chamber 11, so when the high pressure air in the auxiliary chamber 24 to vent to the outer housing 10, the shuttle valve 21 by a first ring end surface 21a is subjected to a first force F ₁ is larger than a second opposite end surface 21b is subjected to a first The combination of the second thrust F _{2 and the third thrust F 3} received by the third end face 21c (ie F ₁ >F ₂ +F ₃ ) makes the shuttle valve ring 21 first along the axial direction of the trigger stem 25 The thrust F ₁ moves to the safety opening position 21d (as shown in Figure 3); on the contrary, when the high-pressure air is introduced into the auxiliary air chamber 24, the first end face 21a (shown in Figure 5 and Figure 2a) is used to withstand the A thrust F _{1 is relatively smaller than the sum of the second thrust F 2} borne by the second end face 21b _{and the third thrust F 3} borne by the third end face 21c (ie F ₁ <F ₂ +F ₃ ), So that the shuttle valve ring 21 is moved along the axial direction of the trigger valve stem 25 by the second thrust F ₂ and the third thrust F ₃ to the safety closed position 21e (as shown in FIG. 5); in other words, the auxiliary air chamber the third thrust of high-pressure air is formed in the size of 24 F ₃ driven to move the shuttle ring 21 to safety valve open position or safety closed position 21d 21e.

Please refer to FIGS. 2 and 2b together. It is illustrated that the slide rod valve 30 is provided on the gun body 10. The slide rod valve 30 includes a slide rod valve chamber 31 and a safety slide rod 32, wherein the slide rod valve chamber 31 is formed in the gun body 10, the safety sliding rod 32 is sliding group in the sliding rod valve chamber 31, one end of the safety sliding rod 32 protrudes out of the gun body 10, and passes through the opening 281 The trigger 28 and the other end of the safety sliding rod 32 are implanted in the main air chamber 11. The slide valve 30 can control the high-pressure air in the main air chamber 11 to flow into the disc-shaped piston air chamber 141, the delay air chamber 40 and the auxiliary air chamber 24. The safety slide bar 32 can be sequentially displaced along its axial direction to a bottom position 32a, an intermediate position 32b, and a top position 32c. The intermediate position 32b is located between the bottom position 32a and the top position 32c. When the safety slide bar 32 is not pressed, the safety slide bar 32 is at the bottom position 32a. When the user presses the safety slide bar 32, the safety slide bar 32 is moved to the top position 32c. When the user presses the trigger 28 and When the safety slide bar 32 is released, the safety slide bar 32 is restrained by the trigger 28 at the intermediate position 32b. The safety slide bar 32 is implemented with a stopper 321, the outer diameter of the stopper 321 is relatively larger than the opening The aperture of 281 enables the safety slide bar 32 to receive the restraint of the trigger 28 via the stop 321 and move to the intermediate position 32b.

A pressure relief hole 41 connected to the delay air chamber 40 is formed on one side of the gun body 10, and the delay air chamber 40 is connected to the atmosphere through the pressure relief hole 41. The cross-sectional area of the delay air chamber 40 must be relatively larger than the pressure relief hole 41, so that the high-pressure air accumulated in the delay air chamber 40 can be continuously released into the atmosphere. In addition, the delay air chamber 40 is also provided with an exhaust hole 42 and a pressure rod 43 that controls the exhaust hole 42 to communicate with the atmosphere. The cross-sectional area of the exhaust hole 42 is relatively larger than the pressure relief hole 41. When the user presses the pressure When the lever 43 is used, the high-pressure air in the delay air chamber 40 can be quickly released into the atmosphere through the exhaust hole 42.

Please refer to Figures 2 and 2a again to illustrate that a trigger valve first valve portion 261, a trigger valve second valve portion 262, and a trigger valve third valve portion 263 are formed between the shuttle valve ring 21 and the trigger valve stem 25 The trigger valve first valve portion 261, the trigger valve second valve portion 262, and the trigger valve third valve portion 263 are respectively formed in the shuttle valve ring 21 and the trigger in order along the axial direction of the shuttle valve ring 21. Between the valve stem 25; the ring wall of the shuttle valve ring 21 includes a first through hole 211 that communicates with the slide rod valve 30, a second through hole 212 that communicates with the atmosphere, and a third through hole that communicates with the slide rod valve 30. 213 and a fourth through hole 214 connected to the slide rod valve 30. The first through hole 211, the second through hole 212, the third through hole 213 and the fourth through hole 214 are implemented in sequence along the axial direction of the shuttle valve ring 21, respectively. It is formed on the ring wall of the shuttle valve ring 21. In the present invention, the valve part refers to an air flow channel formed between a plurality of objects.

Furthermore, four air stop washers 27a, 27b, 27c, 27d are arranged coaxially and spaced apart between the inner wall of the shuttle valve ring 21 and the stem wall of the trigger valve stem 25 along the axial direction, wherein the shuttle valve The inner wall of the ring 21, the stem wall of the trigger valve stem 25, the gas stop washer 27a and the gas stop washer 27b are constructed to form a trigger valve first valve portion 261. The inner wall of the shuttle valve ring 21 and the trigger valve The rod wall of the rod 25, the air stop washer 27b, and the air stop washer 27c are constructed to form a second trigger valve portion 262. The inner wall of the shuttle valve ring 21, the rod wall of the trigger valve stem 25, and the air stop The third valve portion 263 of the trigger valve is constructed between the ring 27c and the gas stop washer 27d. The first valve portion 261 of the trigger valve is used to block the communication between the first perforation 211 and the main air chamber 11. The second valve portion 262 can control the timing of communication between the first through hole 211 and the second hole 212, and the trigger valve third valve portion 263 can control the timing of communication between the third through hole 213 and the fourth through hole 214.

Please refer to FIGS. 2 and 2b again to illustrate that a first valve part 331 of a sliding rod valve, a second valve part 332 of a sliding rod valve, and a sliding rod valve are formed between the sliding rod valve chamber 31 and the safety sliding rod 32, respectively. The third valve portion 333. The wall surface of the slide rod valve chamber 31 includes a first flow passage 311 communicating with the disc-shaped piston air chamber 141, a second flow passage 312 communicating with the trigger valve 20, and a third flow passage 312 communicating with the atmosphere. Flow path 313, a fourth flow path 314 connected to the delay air chamber 40, a fifth flow path 315 connected to the trigger valve 20, and a sixth flow path 316 connected to the main air chamber 11. The sixth flow path 316 is in implementation The upper part extends to the intake flow passage 15 and communicates with the main air chamber 11. In addition, the second flow passage 312 and the fifth flow passage 315 are excluded from communicating with the intake flow passage 15.

Furthermore, four air stop washers 34a, 34b, 34c, 34d are arranged coaxially and spaced apart between the wall surface of the slide rod valve chamber 31 and the rod wall of the safety slide rod 32 along the axial direction, wherein the slide rod valve The wall surface of the chamber 31, the rod wall of the safety slide rod 32, the gas stop washer 34a and the gas stop washer 34b are constructed to form a first valve portion 331 of a slide rod valve. The first valve portion 331 of the slide rod valve can control The timing of the communication between the main air chamber 11 and the first flow path 311, and the timing of the communication between the second flow path 312, the third flow path 313, the fourth flow path 314, and the fifth flow path 315 are regulated. The first valve portion 331 of the valve can simultaneously control the timing of communication between the first flow passage 311 and the second flow passage 312. The flow channels 311 are connected to each other, and the second flow channel 312, the third flow channel 313, the fourth flow channel 314, and the fifth flow channel 315 are connected to each other, or the first flow channel 311 and the second flow channel are connected to each other. The passages 312 communicate with each other; the wall surface of the slide rod valve chamber 31, the rod wall of the safety slide rod 32, the gas stop washer 34b and the gas stop washer 34c are constructed to form a second valve part 332 of the slide rod valve. The second valve portion 332 of the lever valve can control the timing of communication between the fourth flow passage 314 and the fifth flow passage 315. In other words, the fourth flow passage 314 can be controlled by the second valve portion 332 of the slide valve. Communicate with the fifth flow passage 315; the wall surface of the slide rod valve chamber 31, the rod wall of the safety slide rod 32, the gas stop washer 34c and the stop The gas washer 34d is constructed to form a third valve portion 333 of the slide rod valve. The timing of communication, in other words, the fourth flow path 314, the fifth flow path 315, and the sixth flow path 316 can be communicated with each other by the control of the third valve portion 333 of the spool valve.

Please refer to Figures 3 to 8 in order to illustrate that when the pneumatic nail gun is in the initial state (as shown in Figure 3), that is, when the user does not press the trigger valve stem 25 and the safety slide bar 32 (also That is to say, the safety slide bar 32 is currently at the bottom position 32a), the high-pressure air in the main air chamber 11 will enter the safety air chamber 23 through the air intake passage 15 to maintain a constant pressure, and the high-pressure air in the auxiliary air chamber 24 has been discharged. , Making the first thrust F ₁ greater than the combination of the second thrust F ₂ and the third thrust F ₃ (ie F ₁ >F ₂ +F ₃ ), causing the shuttle valve ring 21 to be moved to the safety opening position _{by the first thrust F 1} 21d, the trigger valve second valve portion 262 closes the passage from the first perforation 211 to the second perforation 212, so that the high-pressure air in the disc-shaped piston air chamber 141 cannot be discharged to the outside of the gun body 10 through the trigger valve 20. At the same time, The high-pressure air in the main air chamber 11 enters the disc-shaped piston air chamber 141 through the first flow passage 311 on the slide rod valve chamber 31.

Then, when the user presses the safety slide bar 32 (as shown in FIG. 4, the safety slide bar 32 is moved to the top position 32c), the first valve portion 331 of the slide valve valve closes the main air chamber 11 to the first flow path The passage of 311 and the opening of the passage of the first flow passage 311 to the second flow passage 312 prevent the high-pressure air in the main air chamber 11 from entering the disc-shaped piston air chamber 141; at the same time, the second valve part 332 of the slide rod valve is closed The third flow passage 313 leads to the fourth flow passage 314, and the third valve part 333 of the slide valve opens the passage between the fourth flow passage 314, the fifth flow passage 315 and the sixth flow passage 316 to make the main air chamber In addition to entering the safety air chamber 23 through the intake flow passage 15, the high-pressure air in 11 also enters the delay air chamber 40 through the sixth flow passage 316, the third valve portion 333 of the slide valve, and the fourth flow passage 314, and It enters the auxiliary air chamber 24 through the sixth flow passage 316, the third valve part 333 of the slide rod valve, the fifth flow passage 315, the fourth hole 214, the third valve part 263 of the trigger valve, and the third hole 213. Since the delay air chamber 40 continuously releases high-pressure air into the atmosphere, the first thrust F _{1 is} less than the combination of the second thrust F ₂ and the third thrust F ₃ (ie F ₁ <F ₂ + F ₃ ), so that the shuttle valve a second thrust ring 21 is thrust F ₂ and F ₃ to push to move the third safety closed position 21e (Figure 5). When the shuttle valve ring 21 moves to the safety closed position 21e, the original main air chamber 11 passes through the sixth flow passage 316, the third valve portion 333 of the slide valve, the fifth flow passage 315, the fourth perforation 214, and the second trigger valve. The high-pressure air entering the auxiliary air chamber 24 through the valve portion 262 and the third through hole 213 directly enters the auxiliary air chamber 24 through the sixth flow passage 316, the third valve portion 333 of the slide valve, and the fifth flow passage 315.

Then, when the user presses the safety slide bar 32 and does not release and then presses the trigger valve stem 25 (as shown in FIG. 6), the second valve portion 262 of the trigger valve opens the passage from the first perforation 211 to the second perforation 212, so that The high-pressure air in the disc-shaped piston air chamber 141 is discharged through the first flow passage 311, the first valve portion 331 of the slide rod valve, the second flow passage 312, the first perforation 211, the second valve portion 262 of the trigger valve, and the second perforation 212. The gun body is 10 outside.

Finally, when the user presses the trigger valve lever 25 and releases the safety slide bar 32 (as shown in Figure 7, the safety slide bar 32 is restrained by the trigger 28 in the middle position 32b without returning from the top position 32c to the bottom position 32a ), the first valve portion 331 of the slide valve valve opens the passage of the main air chamber 11 to the first flow passage 311 and closes the passage of the first flow passage 311 to the second flow passage 312, so that the high-pressure air in the main air chamber 11 enters In the disc-shaped piston air chamber 141, at the same time, the third valve part 333 of the slide rod valve closes the passages between the fourth flow path 314, the fifth flow path 315, and the sixth flow path 316, and the slide rod valve The second valve part 332 opens the passage from the fourth flow passage 314 to the fifth flow passage 315, so that the high-pressure air in the main air chamber 11 cannot enter the delay air chamber 40 and the auxiliary air chamber 24, and the auxiliary air chamber 24 The high-pressure air enters the delay air chamber 40 through the fifth flow passage 315, the second valve portion 332 of the slide rod valve, and the fourth flow passage 314 and is released into the atmosphere. The pressure in the auxiliary air chamber 24 drops due to venting (the third thrust F ₃ drops), so that the first thrust F _{1 is} greater than the combination of the second thrust F ₂ and the third thrust F ₃ (ie F ₁ >F ₂ + F ₃ ), the shuttle valve ring 21 is _{moved by the first thrust F 1} to the safety opening position 21d (as shown in Fig. 8); in other words, the user does not press the safety slide bar 32 within a certain period of time, It will cause the shuttle valve ring 21 to move to the safety opening position 21d, making the pneumatic nail gun unable to drive nails.

Please refer to Figures 9 to 10 in order to illustrate that when the pneumatic nail gun is in the end nailing state (that is, the shuttle valve ring 21 is in the safety closed position 21e), the safety slide 32 is not pressed and the trigger valve rod 25 is released ( As shown in Figure 9), because the trigger 28 stops restraining the safety slide bar 32, the safety slide bar 32 is moved to the bottom position 32a; at this moment, the first valve part 331 of the slide valve valve opens the second flow passage 312 and the third flow passage 313 The passage between the fourth flow passage 314 and the fifth flow passage 315 allows the high-pressure air in the auxiliary air chamber 24 to be discharged to the gun through the fifth flow passage 315, the first valve part 331 of the slide valve, and the third flow passage 313体10外。 Body 10 outside. At this time, because the high-pressure air in the main air chamber 11 (first thrust F ₁ ) is constantly accumulated in the safety air chamber 23, and the pressure in the auxiliary air chamber 24 drops due to catharsis (the third thrust F ₃ drops), so The first thrust F ₁ can be instantaneously greater than the combination of the second thrust F ₂ and the third thrust F ₃ (ie F ₁ >F ₂ +F ₃ ), and the shuttle valve ring 21 is pushed to the safety opening _{by the first thrust F 1} Position 21d (shown in Figure 10); in other words, when the user releases the trigger valve stem 25 during the nailing operation, the shuttle valve ring 21 will move to the safety opening position 21d, making the pneumatic nail gun unable to Hit nails.

Please refer to Figures 11 to 12 in order to illustrate that when the pneumatic nail gun first presses the trigger valve stem 25 (as shown in Figure 11) in the initial state, the third valve part 333 of the slide rod valve closes the fourth flow passage 314 and the first The passage between the five flow passages 315 and the sixth flow passage 316 prevents the high-pressure air in the main air chamber 11 from entering the delay air chamber 40, so that the shuttle valve ring 21 is maintained at the safety opening position 21d. Then, when the user presses the trigger valve stem 25 and then presses the safety slide bar 32 (as shown in FIG. 12, the safety slide bar 32 is moved to the top position 32c), because the shuttle valve ring 21 is maintained at the safety opening position 21d , The trigger valve second valve portion 262 closes the passage from the first perforation 211 to the second perforation 212, so that the high-pressure air in the disc-shaped piston air chamber 141 cannot pass through the first flow passage 311, the first valve portion 331 of the slide rod valve, The second flow passage 312, the first perforation 211, the second trigger valve portion 262, and the second perforation 212 are discharged to the outside of the gun body 10; at the same time, the high-pressure air in the main air chamber 11 is blocked by the air stop gasket 27d. The third valve part 263 of the trigger valve and the third hole 213 enter the auxiliary air chamber 24 through the sixth flow passage 316, the third valve part 333 of the slide rod valve, the fifth flow passage 315, and the fourth perforation 214, so that the main The high-pressure air in the air chamber 11 is released to the atmosphere through the through hole 221. As a result, the thrust formed by the high-pressure air in the auxiliary air chamber 24 is insufficient to drive the shuttle valve ring 21 toward the safety closed position. In other words, the user must follow the sequential operation mode, that is, first press the safety slide bar 32 to move the shuttle valve ring 21 to the safety closed position 21e before starting the nail driving operation.

The above embodiments only express the preferred embodiments of the present invention, but they should not be understood as a limitation on the scope of the patent application of the present invention. Therefore, the present invention should be subject to the content of the claims defined in the scope of the patent application.

10: Gun body

11: Main air chamber

141: Disc piston air chamber

15: intake runner

20: Trigger valve

21: Shuttle valve ring

211: First Piercing

212: second perforation

213: Third Piercing

214: Fourth Piercing

22: Trigger valve seat

221: Through Hole

24: auxiliary air chamber

25: Trigger stem

261: Trigger valve first valve part

262: Trigger valve second valve part

263: Trigger valve third valve part

28: Trigger

281: open hole

30: Slide valve

31: Sliding rod valve chamber

311: first runner

312: second runner

313: third runner

314: fourth runner

315: Fifth runner

316: Sixth Runner

32: safety slide

321: Block

331: The first valve part of the slide valve

332: The second valve part of the slide valve

333: The third valve part of the slide valve

40: Delay air chamber

41: Pressure relief hole

42: Vent

43: pressure bar

Claims (14)

An air circuit structure of a pneumatic nail gun includes: a gun body with a main air chamber for gathering high pressure air, a disc-shaped piston air chamber and a delay air chamber for continuously releasing high pressure air to the atmosphere; a trigger valve , Set on the gun body, the trigger valve includes a shuttle valve ring, a trigger valve stem, a safety air chamber and an auxiliary air chamber, the shuttle valve ring is slidably set on the trigger valve stem, the shuttle valve The two ends of the valve ring are respectively exposed in the safety air chamber and the main air chamber, and the shuttle valve ring extends through the auxiliary air chamber. The high-pressure air in the safety air chamber forms a first thrust, and the main air chamber The high-pressure air formed a second thrust, the high-pressure air in the auxiliary air chamber formed a third thrust, the first thrust, the second thrust and the third thrust respectively act on the shuttle valve ring, and the second thrust The thrust force and the third thrust force are respectively opposite to the direction of the first thrust force. The trigger valve controls the high-pressure air in the disc-shaped piston air chamber to discharge to the gun body through the shuttle valve ring and the trigger valve rod. It is equipped with a trigger for pressing and touching the trigger valve stem; a sliding rod valve is arranged on the gun body, the sliding rod valve includes a safety sliding rod, the safety sliding rod extends through the trigger, and the sliding rod valve passes through The safety slide rod controls the high-pressure air in the main air chamber to lead to the disc-shaped piston air chamber, the delay air chamber and the auxiliary air chamber; wherein the safety air chamber is constantly connected to the main air chamber and collects high-pressure air, and the The safety sliding rod is displaced along its axial direction to a bottom position, so that the sliding rod valve can control the high-pressure air in the auxiliary air chamber to discharge to the outside of the gun, so that the combined third thrust and the second thrust are less than the first thrust, Then the shuttle valve ring is driven to move to a safety open position; the safety slide rod is displaced along its axial direction to a top position, so that the slide valve can control the high-pressure air in the main air chamber to the auxiliary air chamber, so that The sum of the third thrust and the second thrust formed by the accumulation of high-pressure air in the auxiliary air chamber is greater than the first thrust A pushing force drives the shuttle valve ring to move from the safety open position to a safety closed position; the safety slide bar is moved to an intermediate position by the restraint of the trigger, and the intermediate position is located at the bottom position and the top position In between, the high-pressure air in the auxiliary air chamber is continuously released to the atmosphere through the delay air chamber, so that the sum of the third thrust and the second thrust is gradually smaller than the first thrust, thereby driving the shuttle valve ring by The safety closed position moves to the safety open position. The air path structure of the pneumatic nail gun according to claim 1, wherein an air inlet runner is formed in the gun body, and both ends of the air inlet runner respectively extend to the main air chamber and the safety air chamber, and the main air chamber The high-pressure air flows into the safety air chamber through the intake flow passage. According to claim 2, the air circuit structure of the pneumatic nail gun, wherein the trigger valve further includes a trigger valve seat, the trigger valve seat is located at the bottom of the trigger valve, and is assembled on the gun body, the trigger valve The rod extends through the shuttle valve ring and the trigger valve seat, the safety air chamber is formed between the shuttle valve ring and the trigger valve seat, and the auxiliary air chamber is formed between the gun body and the shuttle valve Between the rings. The air path structure of the pneumatic nail gun according to claim 3, wherein the shuttle valve ring has a first end surface, a second end surface and a third end surface, the first end surface is exposed in the safety air chamber, and the first end surface Two end faces are exposed in the main air chamber, the third end face is exposed in the auxiliary air chamber, the first end face has a thrust area that can contact high-pressure air is relatively larger than the second end face, and the second end face and the third end face The sum of the thrust areas of the end surface that can contact the high-pressure air is relatively larger than the first end surface. The air circuit structure of the pneumatic nail gun according to claim 3, wherein a trigger valve first valve part, a trigger valve second valve part, and a trigger valve third valve are formed between the shuttle valve ring and the trigger valve stem Part, the ring wall of the shuttle valve ring includes a first through hole communicating with the slide rod valve, a second through hole communicating with the atmosphere, a third punch communicating with the slide rod valve, and a third hole communicating with the slide rod valve. The fourth perforation of the trigger valve, the first valve portion of the trigger valve is used to block the communication between the first perforation and the main air chamber, and the second valve portion of the trigger valve can control the timing of communication between the first perforation and the second perforation , The trigger valve third The valve part can regulate the timing of communication between the third through hole and the fourth through hole. The air circuit structure of the pneumatic nail gun according to claim 5, wherein the first valve portion of the trigger valve, the second valve portion of the trigger valve, and the third valve portion of the trigger valve are in sequence along the axial direction of the shuttle valve ring, respectively Formed between the shuttle valve ring and the trigger valve stem, the first perforation, the second perforation, the third perforation and the fourth perforation are respectively formed in the shuttle along the axial direction of the shuttle valve ring in sequence On the ring wall of the moving valve ring. The air circuit structure of the pneumatic nail gun according to claim 1, wherein the slide rod valve includes a slide rod valve chamber, the safety slide rod slide is set in the slide rod valve chamber, and one end of the safety slide rod protrudes to Outside the gun body, the other end of the safety sliding rod is implanted in the main air chamber. According to claim 7, the air circuit structure of the pneumatic nail gun, wherein a first valve part of a slide rod valve, a second valve part of a slide rod valve, and a slide rod are formed between the slide rod valve chamber and the safety slide rod. The third valve part of the stem valve. The wall surface of the slide rod valve chamber includes a first flow channel communicating with the disc-shaped piston air chamber, a second flow channel communicating with the trigger valve, and a third flow communicating with the atmosphere. Channel, a fourth flow channel communicating with the delay air chamber, a fifth flow channel communicating with the trigger valve, and a sixth flow channel communicating with the main air chamber, the first valve part of the slide valve can control the main air The communication timing between the chamber and the first flow channel, and control the communication timing between the second flow channel, the third flow channel, the fourth flow channel and the fifth flow channel, the first valve of the slide rod valve The second valve portion of the slide valve can control the timing of communication between the fourth flow channel and the fifth flow channel at the same time, and the slide rod The third valve portion of the valve can regulate the timing of communication between the fourth flow path, the fifth flow path, and the sixth flow path. According to claim 8, the air circuit structure of the pneumatic nail gun, wherein the first valve part of the slide rod valve, the second valve part of the slide rod valve, and the third valve part of the slide rod valve are respectively along the sliding rod valve chamber The axial direction is sequentially formed between the slide rod valve chamber and the safety slide rod, the first flow path, the second flow path, the third flow path, the fourth flow path, the fifth flow path and the The sixth flow passages are respectively formed in the sliding rod valve cavity in sequence along the axial direction of the sliding rod valve cavity The wall of the room. According to claim 1, the gas path structure of the pneumatic nail gun, wherein the trigger is formed with an opening through which the safety slide bar can penetrate, the safety slide bar is formed with a stopper, and the safety slide bar passes through the stopper Accept the constraints of the trigger. According to claim 10, the air path structure of the pneumatic nail gun, wherein the outer diameter of the blocking portion is relatively larger than the aperture of the opening. The air path structure of the pneumatic nail gun according to claim 1, wherein a pressure relief hole connected to the delay air chamber is formed on one side of the gun body, and the high pressure air in the delay air chamber is continuously released into the atmosphere through the pressure relief hole. The air circuit structure of the pneumatic nail gun according to claim 12, wherein the cross-sectional area of the delay air chamber is relatively larger than the pressure relief hole. According to claim 12, the air path structure of the pneumatic nail gun, wherein one side of the gun body is further formed with an exhaust hole communicating with the delay air chamber and a pressure rod for controlling the exhaust hole to communicate with the atmosphere, the exhaust hole The cross-sectional area is relatively larger than the pressure relief hole.

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