A nail and its nail gun

Abstract

The application discloses a shot and a pneumatic nail gun thereof and belongs to the technical field of tunnel support. The shot comprises a first rotary arm and a second rotary arm. The first rotary arm and the second rotary arm comprise a rotating disc part located in the center and a pressing arm part located at both ends. An anchor tip part is vertically connected to the pressing arm part. The rotating disc parts of the first rotary arm and the second rotary arm are hinged through a damping rotating shaft. The rotating disc parts of the first rotary arm and the second rotary arm are provided with rotating grooves embedded with each other. The rotating disc part of the second rotary arm is provided with a non-circular insertion groove. The pneumatic nail gun comprises a gun body and a handle. The gun body is provided with an impact piston. The handle is provided with a trigger. The gun head end of the gun body is provided with a firing port. The gun body is rotatably connected with a rotating rod. The rotating rod comprises an insertion end and a rotating end. The insertion end is provided with an insertion head. The gun tail end is provided with a damping knob. The rotating end is fixedly connected with the damping knob. The shot can solve the problem of the flexible net emptying and guarantee the performance of the flexible net without being damaged. The shot can guarantee the smooth shot concrete to hang the slurry and reduce the threat of rock burst disaster.

Description

Technical Field

[0001] This invention relates to the field of tunnel support technology, and in particular to a nail gun and its pneumatic nail gun. Background Technology

[0002] During tunnel excavation, under high ground stress, the strain energy accumulated in the surrounding rock is transformed into dynamic potential energy of the rock blocks by excavation disturbance. After unloading during excavation, this can induce dynamic instability of brittle hard rock, leading to rockbursts. Rockbursts pose a threat to the safety of construction personnel and machinery. Traditional steel mesh support cannot effectively absorb rockburst energy. Therefore, flexible mesh support methods have been developed to replace traditional metal mesh. Compared to metal mesh, flexible mesh has high strength and high toughness, acting as a flexible buffer and energy release mechanism. It can absorb rockburst energy through its own deformation, thus better ensuring construction safety.

[0003] While flexible wire mesh has a stronger energy absorption effect than ordinary steel wire mesh, its rigidity is relatively low. It is prone to deformation at locations where the anchor bolts are not firmly anchored, resulting in a lack of tight adhesion to the rock surface and subsequent gaps. This causes significant vibration during shotcreting, leading to concrete falling off already applied areas and resulting in substantial waste of materials and construction time. Current solutions involve temporary reinforcement at the gaps in the flexible mesh to improve its fit. These temporary reinforcement methods often use pneumatic nail guns to drive T-shaped or U-shaped nails into the rock surface to improve adhesion. However, T-shaped nails can damage the flexible mesh strips, degrading their performance, while U-shaped nails have a fixed spacing, making them unadjustable and unsuitable for multi-size strip installations. Clearly, a temporary fixing device that can be used for multi-size flexible mesh without compromising its performance is currently lacking. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned technical problems and provide a nail gun and its pneumatic nail gun, which can solve the problem of flexible netting falling out, while ensuring that the performance of the flexible netting is not damaged, ensuring that shotcrete can be applied smoothly, and reducing the threat of rock burst disasters to personnel and machinery.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention discloses a nail gun, including a first rotating arm and a second rotating arm. Both the first rotating arm and the second rotating arm include a turntable portion located in the center and pressure arm portions located at both ends. The pressure arm portions located at both ends are symmetrically and staggered along the center of the turntable portion. An anchor tip portion is vertically connected to the end of the pressure arm portion away from the turntable portion. The turntable portion of the first rotating arm and the turntable portion of the second rotating arm are hinged by a damping shaft. The back side of the turntable portion of the first rotating arm and the pressure surface of the turntable portion of the second rotating arm are provided with rotating grooves for mutual insertion. The rotating grooves have a design groove depth that allows the pressure surfaces of the pressure arm portions of the first rotating arm and the second rotating arm to be flush with each other. The back side of the turntable portion of the second rotating arm is provided with a non-circular slot for inserting the rotating rod of the pneumatic nail gun.

[0006] Preferably, the pressure arm is a rectangular rod, the width of which is equal to the radius of the turntable, and the misalignment position of the pressure arm of the first rotating arm is opposite to the misalignment position of the pressure arm of the second rotating arm.

[0007] 3. A nail according to claim 2, characterized in that the anchor tip is a right-angled triangle, one right-angled side of the right-angled triangle is fixedly connected to the pressure arm, and the long right-angled sides of the right-angled triangles on the pressure arms at both ends face opposite directions.

[0008] A pneumatic nail gun is also disclosed, comprising a gun body and a handle. The gun body contains an impact piston for firing the aforementioned nail, and the handle has a trigger for actuating the impact piston. The gun body has a firing port at the head end for the impact piston to slide through. The gun body is characterized by a rotating rod rotatably connected to it. The rotating rod includes a plug-in end extending from the head end of the gun body and a rotating end extending from the tail end of the gun body. The plug-in end has a plug connector that matches a non-circular slot of the nail. The pressure arm of the nail is located on the movement path of the impact piston. A damping knob is rotatably connected to the tail end of the gun body, and the rotating end is fixedly connected to the damping knob.

[0009] Preferably, the gun barrel has an arc-shaped abutment cover at the gun head end.

[0010] Preferably, there are two impact pistons, each with a semi-annular firing head, and the gun body has two semi-annular firing ports at the head end, the firing ports being symmetrically arranged with their ring tops facing away from each other.

[0011] Preferably, the gun body is provided with a sealed mounting cavity, the sealed mounting cavity is provided with an air intake channel and an exhaust channel communicating with the outside, and a control cylinder and an impact cylinder with a self-contained return air tank are installed in the sealed mounting cavity, the impact cylinder and the control cylinder are arranged sequentially from the gun head end to the gun tail end of the gun body;

[0012] The impact cylinder includes a first impact chamber and a second impact chamber divided by the impact piston. The first impact chamber is close to the muzzle end of the gun body, and the second impact chamber is close to the breech end of the gun body. The firing port is connected to the first impact chamber. The semi-annular firing head is located in the first impact chamber. The second impact chamber is provided with an air inlet. The first impact chamber is provided with a return air port and a throttling air port. The return air port and the throttling air port are on the moving path of the impact piston. The return air port and the throttling air port are connected to the return air tank.

[0013] The control cylinder includes a first control chamber and a second control chamber divided by a control piston. The first control chamber is close to the first impact chamber, and the second control chamber is close to the rear end of the gun body. The first control chamber is provided with a first air inlet, and the second control chamber is provided with a second air inlet. The second air inlet is connected to the exhaust channel. The first air inlet is located on the movement path of the control piston moving towards the second control chamber. The control piston is provided with a sealing end and a through channel. The first control chamber is provided with an end protrusion for the sealing end to be slidably connected in a sealing manner. The through channel connects the end protrusion and the second control chamber. The air inlet is located on the movement path of the sealing end. There is a gas gap between the end protrusion and the air inlet. The gas gap is connected to the sealing mounting cavity.

[0014] The handle is equipped with a handle air tank, and the handle air tank is equipped with a first air inlet, a second air inlet and an air inlet connector. The first air inlet is connected to the air inlet channel, and the air inlet connector is connected to the high-pressure air supply tank.

[0015] The trigger includes a three-way housing and a trigger body. The three-way housing includes a main pipe and a branch pipe that are interconnected. One end of the main pipe is connected to the second air inlet through a throttle valve, and the branch pipe is connected to the first air inlet. The trigger body includes a pulling part, a sliding rod part, and a blocking part that can block the throttle valve, which are connected in sequence. The sliding rod part is slidably connected to the other end of the main pipe. The blocking part is located inside the main pipe, and the pulling part is located outside the main pipe. A return spring is provided between the pulling part and the handle. The diameter of the sliding rod part is smaller than that of the main pipe, and the diameter of the blocking part matches that of the main pipe.

[0016] Preferably, the gun body is provided with two impact cylinders, and the return air tank outside the impact cylinder is semi-cylindrical. The rectangular surfaces of the two return air tanks are interlocked, and the rectangular surface of the return air tank is provided with a rotating rod channel for the rotating rod to be inserted.

[0017] Preferably, the device includes a nail gun magazine, which comprises a magazine mounting bracket, a U-shaped bracket, and an L-shaped push plate. The magazine mounting bracket is hinged to the lower end of the gun head of the gun body. The magazine mounting bracket is provided with a magazine slide rail. The web of the U-shaped bracket has a frame slide groove on the side facing away from the support arm. The frame slide groove is slidably connected to the magazine slide rail. The support arm of the U-shaped bracket has a strip-shaped sliding hole. The L-shaped push plate has a sliding lever for slidingly connecting to the strip-shaped sliding hole. The sliding lever extends out of the strip-shaped sliding hole. A limiting plate is fixedly connected to the support arm of the U-shaped bracket. A nail gun slide groove is formed between the limiting plate and the support arm for the anchor tip to be inserted and slid. The extension direction of the strip-shaped sliding hole and the nail gun slide groove is consistent. Hooks for hooking the sliding lever are provided on both sides of the gun body.

[0018] Preferably, the connector and the non-circular slot can be magnetized.

[0019] The present invention achieves the following technical effects compared to the prior art:

[0020] The nail in this invention mainly consists of a first rotating arm and a second rotating arm, which are hinged together by a central turntable. This allows the first and second rotating arms to be extended and retracted. When extended, the first and second rotating arms form an X-shape, with an angle between their pressing parts. This angle can be adjusted according to the width of the flexible mesh strips to accommodate anchoring of flexible mesh strips with different widths. During anchoring, similar to a U-shaped nail, the anchor tips of the first and second rotating arms are anchored into the rock surface, while the fitting part and the turntable part press the flexible mesh tightly, thereby eliminating the problem of the flexible mesh anchoring area separating from the rock surface. Compared to T-shaped nails, which do not damage the flexible mesh strips, intersecting U-shaped nails can adapt to the width of the flexible mesh strips. This solves the problem of the flexible mesh separating from the rock surface while ensuring that the performance of the flexible mesh is not damaged, ensuring smooth application of shotcrete and reducing the threat of rockburst disasters to personnel and machinery. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the external structure of a pneumatic nail gun;

[0023] Figure 2 This is a schematic diagram of the internal structure of the gun.

[0024] Figure 3 A schematic diagram of the nail gun, rotating rod, and damping knob;

[0025] Figure 4 This is a schematic diagram of the structure of a nail gun;

[0026] Figure 5 This is a schematic diagram of the impact cylinder.

[0027] Figure 6 This is a structural diagram of the magazine mounting bracket;

[0028] Figure 7 This is a schematic diagram of the U-shaped frame structure;

[0029] Figure 8 A schematic diagram illustrating the principle of firing the piston (before the trigger is pulled);

[0030] Figure 9 This is a schematic diagram illustrating the principle of firing the piston (after the trigger is pulled).

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Gun body; 2. Handle; 3. Trigger; 4. Nail clip; 5. Rotating lever; 6. Impact cylinder; 7. Control cylinder; 8. Nail;

[0033] 101. Intake passage; 102. Exhaust passage; 103. Arc-shaped abutment cover; 104. Hinge frame; 105. Rotation hole; 106. Sealed mounting cavity;

[0034] 201. Handle air tank; 202. First air inlet; 203. Air inlet connector; 204. Second air inlet;

[0035] 301. Main pipe; 302. Branch pipe; 303. Throttling valve; 304. Actuating part; 305. Sliding rod part; 306. Sealing part; 307. Return spring; 308. Trigger protection ring;

[0036] 401. Magazine mounting bracket; 402. U-shaped bracket; 403. L-shaped push plate; 404. Magazine slide rail; 405. Strip-shaped sliding hole; 406. Sliding lever; 407. Limiting plate; 408. Nail gun slide groove; 409. Frame slide groove; 410. Hinge rod;

[0037] 501. Damping knob;

[0038] 601. Impact piston; 602. First impact chamber; 603. Second impact chamber; 604. Return air tank; 605. Return air port; 606. Throttling air port; 607. Rotary rod channel; 608. Semi-annular firing head;

[0039] 701. Control piston; 702. First control chamber; 703. Second control chamber; 704. First air inlet; 705. Second air inlet; 706. Gas gap; 707. Through passage; 708. Sealing end;

[0040] 801. Turntable section; 802. Pressure arm section; 803. Anchor tip section; 804. Rotating groove; 805. Non-circular slot; 806. Damping shaft. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Example 1

[0043] This embodiment provides a nail gun, such as Figures 1 to 9As shown, the device includes a first rotating arm and a second rotating arm. Both the first and second rotating arms include a turntable portion 801 and two pressure arms 802. The turntable portion 801 is located at the center of the rotating arm, and the two pressure arms 802 are connected to both sides of the turntable portion 801, i.e., located at both ends of the rotating arm. The two pressure arms 802 are symmetrically and staggered around the center of the turntable portion 801. Anchor tips 803 are fixedly connected to the pressing surfaces of the two pressure arms 802. The anchor tips 803 are perpendicular to the pressing surfaces of the pressure arms 802 and are located at the end of the pressure arms 802 furthest from the turntable portion 801. The turntable portions 801 of the first and second rotating arms are hinged together by a damping shaft 806, allowing the first and second rotating arms to maintain a certain angle after rotating out of rotation. The turntable portion 801 of the first rotating arm has a rotating groove 804 on its back side (opposite to the pressing surface). The turntable portion 801 of the second rotating arm also has a rotating groove 804 on its pressing surface. The rotating grooves 804 of the first and second rotating arms interlock, and their depth is designed so that after the rotating grooves 804 of the first and second rotating arms are engaged, the pressing surfaces of the pressing arms 802 of the first and second rotating arms are flush, ensuring that the pressing surfaces of the pressing arms 802 of the first and second rotating arms fit well against the anchoring surface. The turntable portion 801 of the second rotating arm has a non-circular slot 805. Inserting the rotating rod 5 of the pneumatic nail gun into the non-circular slot 805 completes the installation of the nail 8 and the pneumatic nail gun. By manually controlling the first rotating arm and rotating the rotating rod 5 of the pneumatic nail gun to rotate the second rotating arm, the first and second rotating arms can be unfolded. Adjusting the angle between them can accommodate flexible mesh strips of different widths. For non-circular slots 805, any slot that is not perfectly circular is acceptable; it can be a triangular slot, a rectangular slot, or even an S-shaped slot. Figure 4 The groove is a combination of a circular groove and a strip groove to ensure that there is no relative rotation between the rotating rod 5 and the turntable part 801 of the second rotating arm.

[0044] Working principle:

[0045] Hold any one of the pressure arm portions 802 of the first rotating arm by hand, keeping the turntable portion 801 of the first rotating arm stationary. Rotate the rotating rod 5, and the turntable portion 801 of the second rotating arm will rotate around the damping shaft 806, causing the first and second rotating arms to unfold into an X shape. At this time, an angle is formed between the pressure arm portions 802 of the first and second rotating arms. Adjust this angle according to the width of the flexible net strip. Then, bring the anchor tip portion 803 of the first and second rotating arms close to the rock surface, so that the strip of the flexible net to be anchored is located between the two anchor tips 803 of the first rotating arm and between the anchor tips 803 of the second rotating arm. Then, use a pneumatic nail gun to knock the first and second rotating arms off the rotating rod 5 and impact them toward the rock surface until the anchor tips 803 of the first and second rotating arms are completely anchored into the rock surface. The position of the flexible net to be anchored is then anchored to the rock surface. Compared to T-shaped nails, which do not damage the flexible mesh strip, intersecting U-shaped nails can adapt to the width of the flexible mesh strip.

[0046] In this embodiment, as Figures 1 to 9 As shown, the pressure arm 802 is a rectangular rod, the width of which is equal to the radius of the turntable 801. The misalignment position of the pressure arm 802 of the first rotating arm is opposite to that of the pressure arm 802 of the second rotating arm. This arrangement ensures that when the nail is retracted, the sides of the pressure arm 802 of the first and second rotating arms can completely fit together, meaning there is no angle between the first and second rotating arms, forming a rod-like structure. Furthermore, compared to a circular rod, the rectangular rod has a larger pressing surface, improving the adhesion between the flexible mesh strips and the rock surface.

[0047] Furthermore, in this embodiment, as Figures 1 to 9 As shown, the anchor tip 803 is a right-angled triangle, with one right-angled side of the triangle perpendicularly fixed to the pressure arm 802. The other long right-angled side of the right-angled triangles on the two pressure arms 802 on either side of the turntable 801 faces opposite directions. This arrangement ensures that when the pressure arms 802 of the first and second rotating arms are fully engaged, the right-angled sides of the right-angled triangles of the anchor tips 803 and the second rotating arms are also fully engaged, allowing the anchor tips 803 and the second rotating arms to form a new triangle, as shown... Figure 4 As shown.

[0048] Example 2

[0049] This embodiment provides a pneumatic nail gun, such as Figures 1 to 9As shown, the gun includes a gun body 1 and a handle 2. The gun body 1 contains an impact piston 601, and the handle 2 has a trigger 3. The trigger 3 activates the impact piston 601. The principle by which the trigger 3 activates the impact piston 601 is exactly the same as that of existing pneumatic nail guns, so it will not be elaborated further here. The gun body 1 has a firing port at its head end, and the impact piston 601 is slidably and sealed to the firing port. After the trigger 3 activates the impact piston 601, the impact piston 601 quickly extends out of the firing port to fire the nail 8 in Embodiment 1. A rotating rod 5 is rotatably connected to the gun body 1. The rotating rod 5 includes a plug end and a rotating end. The plug end extends out of the gun body 1's head end, and a connector 501 is fixedly connected to the plug end. The connector 501 matches the non-circular slot 805 of the nail 8 to be inserted into the non-circular slot 805. The rotating end extends out of the gun body 1's tail end. A damping knob 502 is rotatably connected to the gun body 1's tail end. The damping knob 502 is fixedly connected to the rotating section. There is a damping force between the damping knob 502 and the gun body 1, ensuring that the rotating rod 5 will not rotate again after being released.

[0050] Working principle:

[0051] Inserting the non-circular slot 805 of the nail 8 into the connector 501 completes the nail insertion. Then, controlling the first rotating arm of the nail 8 and rotating the damping knob 502 unfolds the first and second rotating arms, forming an X shape. Adjust the angle between the first and second rotating arms according to the width of the flexible mesh strips. Then, pulling the trigger 3 triggers the impact piston 601, which quickly extends from its firing port to strike the pressure arm 802 of the nail 8. This causes the non-circular slot 805 of the nail 8 to disengage from the connector 501, and the nail 8 is driven into the pressure surface to complete anchoring. The pressure arm 802 and the turntable 801 then press the flexible mesh strips together, completing the anchoring of the flexible mesh area.

[0052] This embodiment provides a pneumatic nail gun, such as Figures 1 to 9 As shown, the gun body 1 has an arc-shaped abutment cover 103 at the gun head end. The arc-shaped abutment cover 103 is located on the upper part of the gun head end. When in use, the arc-shaped abutment cover 103 of the gun body 1 is pressed against the rock surface, which is beneficial for positioning and improving firing stability.

[0053] This embodiment provides a pneumatic nail gun, such as Figures 1 to 9 As shown, there are two impact pistons 601 inside the gun body 1. Each impact piston 601 is equipped with a semi-annular firing head 608. The gun head end of the gun body 1 has two semi-annular firing ports, which are symmetrically arranged with their ring tops facing away from each other. After the two semi-annular firing heads 608 are respectively sealed and slidably connected to the two firing ports, the two semi-annular firing heads 608 can form a complete circle, as shown. Figure 1 As shown.

[0054] This embodiment provides a pneumatic nail gun, such as Figures 1 to 9 As shown, the gun body 1 has a sealed mounting cavity 106. The sealed mounting cavity 106 has an air inlet channel 101 and an exhaust channel 102, and the exhaust channel 102 is connected to the outside. An impact cylinder 6 and a control cylinder 7 are installed in the sealed mounting cavity 106. The impact cylinder 6 has its own return air tank 604. The impact cylinder 6 and the control cylinder 7 are arranged sequentially from the gun head end to the gun tail end of the gun body 1.

[0055] The impact cylinder 6 is equipped with an impact piston 601, which divides the impact cylinder 6 into a first impact chamber 602 and a second impact chamber 603. The first impact chamber 602 is located near the muzzle, while the second impact chamber 603 is located near the breech. The firing port communicates with the first impact chamber 602, and a semi-annular firing head 608 is located within the first impact chamber 602. The second impact chamber 603 has an air inlet. The first impact chamber 602 has a return air port 605 and a throttling air port 606. From the muzzle to the breech, the return air port 605 and the throttling air port 606 are arranged sequentially and are located on the moving path of the impact piston 601. That is, as the impact piston 601 moves toward the first impact chamber 602, the throttling air port 606 and the return air port 605 can be closed sequentially. Moving toward the second impact chamber 603, the return air port 605 and the throttling air port 606 can be opened. Both the return air port 605 and the throttling air port 606 are connected to the return air storage tank 604.

[0056] The control cylinder 7 contains a control piston 701, which divides the control cylinder 7 into a first control chamber 702 and a second control chamber 703. The first control chamber 702 is located near the second impact chamber 603, and the second control chamber 703 is located near the rear of the gun. The first control chamber 702 has a first air inlet 704, and the second control chamber 703 has a second air inlet 705, which communicates with the exhaust passage 102. The first air inlet 704 is located on the path of the control piston 701 as it moves toward the second control chamber 703. This means that as the control piston 701 moves toward the second control chamber 703, the first air inlet 704 will gradually close, while as it moves toward the first control chamber 702, the first air inlet 704 will gradually open. The control piston 701 is provided with a sealing end 708 and a through channel 707. The first control chamber 702 is provided with an end protrusion for sealing and sliding connection of the sealing end 708, so that the first control chamber 702 forms a sealed chamber. The through channel 707 passes through the sealing end 708 and the control piston 701, and connects the end protrusion and the second control chamber 703. The end protrusion and the air inlet are coaxially arranged. The air inlet is located on the moving path of the sealing end 708, and there is a gas gap 706 between the end protrusion and the air inlet. The gas gap 706 communicates with the sealing mounting cavity 106. This means that when the control piston 701 moves toward the first control chamber 702, the sealing end 708 will gradually seal the gas gap 706 and the end protrusion. When the control piston 701 moves toward the second control chamber 703, it will gradually close the first air inlet 704.

[0057] The handle 2 is equipped with a handle air tank 201. The handle air tank 201 is equipped with a first air inlet 202, a second air inlet 204 and an air inlet connector 203. The first air inlet 202 is connected to the air inlet channel 101 and the air inlet connector 203 is connected to the high-pressure air supply tank.

[0058] The trigger 3 includes a three-way housing and a trigger body. The three-way housing includes a main pipe 301 and a branch pipe 302 that are interconnected. One end of the main pipe 301 is connected to the second air inlet 204 through a throttle valve 303, and the branch pipe 302 is connected to the first air inlet 704. The trigger body includes a pulling part 304, a sliding part 305, and a sealing part 306 connected in sequence. The sliding part 305 is slidably connected to the other end of the main pipe 301, the sealing part 306 is located inside the main pipe 301, and the pulling part 304 is located outside the main pipe 301. A return spring 307 is provided between the pulling part 304 and the handle 2. The diameter of the slide rod 305 is smaller than that of the main pipe 301, so that there is an air outlet gap between the slide rod 305 and the main pipe 301. The diameter of the sealing part 306 matches that of the main pipe 301. The sealing part 306 can block the throttle valve 303 by moving towards the throttle valve 303. The sealing part 306 can block the air outlet gap by moving towards the end of the main pipe 301 without the throttle valve 303.

[0059] Working principle:

[0060] ① Trigger not pulled, state 3, refer to Figure 8 As shown: Under the action of the return spring 307, the sealing part 306 blocks the air outlet gap between the slide rod part 305 and the main pipe 301. Some of the high-pressure gas in the handle air tank 201 will enter the first control chamber 702 through the second air inlet 204, the branch pipe 302, and the air inlet channel 101. Another part of the high-pressure gas will enter the sealed mounting cavity 106 through the first air inlet 202 and the first air inlet 704. At the same time, the outside atmosphere enters the second control chamber 703 through the exhaust channel 102 and the second air inlet 705. Under the combined action of the high-pressure gas and the outside gas, the thrust on the control piston 701 is greater than the thrust on the control piston 701 by the gas in the sealed mounting cavity 106. As a result, the control piston 701 will move towards the first control chamber 702, and the sealing end 708 will move towards the second control chamber 703, thereby sealing the gas gap 706 and the air inlet opening of the second control chamber 703. At the same time, the through channel 707 on the control piston 701 connects the second control chamber 703 and the second impact chamber 603. The gas pressure in the second impact chamber 603 is equal to the external gas pressure and lower than the gas pressure provided by the return gas tank 604 to the first impact chamber 602 through the return gas port 605 and the throttle gas port 606. Therefore, the impact piston 601 will not drive the semi-annular firing head 608 to fire the firing nail 8.

[0061] ② The state after pulling trigger 3, see reference. Figure 9As shown: The pressing and releasing part 304 and the sliding rod part 305 push the sealing part 306 to block the throttle valve 303. The high-pressure gas in the handle gas tank 201 cannot enter the first control chamber 702 through the second air inlet 204, branch pipe 302, and air inlet channel 101. The air outlet gap between the sliding rod part 305 and the main pipe 301 opens, and the gas in the sealed mounting chamber 106 is discharged to the outside through the branch pipe 302 and the air outlet gap. All the high-pressure gas in the handle gas tank 201 will enter the sealed mounting chamber 106 through the first air inlet 202 and the first air inlet 704. The thrust of the gas in the sealed mounting chamber 106 on the control piston 701 is greater than the thrust of the atmospheric pressure in the second control chamber 703 on the control piston 701. Therefore, the control... The piston 701 moves toward the second control chamber 703, and the sealing end 708 moves away from the second impact chamber 603. Then, the gas gap 706 and the air inlet of the second control chamber 703 are both opened, and all the high-pressure gas in the sealed mounting cavity 106 enters the gas gap 706 and the second control chamber 703. At the same time, the through channel 707 is blocked by the cavity wall of the second control chamber 703, and atmospheric pressure cannot enter the second control chamber 703. The pressure in the second control chamber 703 is greater than the gas pressure provided by the return gas tank 604 to the first impact chamber 602 through the return gas port 605 and the throttling gas port 606. Therefore, the impact piston 601 will drive the semi-annular firing head 608 to quickly fire the firing nail 8.

[0062] In this embodiment, as Figures 1 to 9 As shown, the gun body 1 contains two impact cylinders 6. The return air tanks 604 outside the impact cylinders 6 are semi-cylindrical, and the rectangular surfaces of the two return air tanks 604 interlock. A rotating rod channel 607 is provided on the rectangular surface of the return air tanks 604, allowing the rotating rod 5 to be inserted and rotated. Correspondingly, both the gun head end and the gun tail end of the gun body 1 are provided with rotating holes 105, which are coaxially arranged with the rotating rod channel 607, allowing the rotating rod 5 to be inserted and rotated.

[0063] In this embodiment, as Figures 1 to 9As shown, the device includes a nail gun magazine 4, which comprises a magazine mounting bracket 401, a U-shaped bracket 402, and an L-shaped push plate 403. The magazine mounting bracket 401 is hinged below the muzzle end of the gun body 1. Specifically, a hinge bracket 104 can be provided below the muzzle end of the gun body 1, and the end of the magazine mounting bracket 401 is hinged to the hinge bracket 104 via a hinge rod 410. The magazine mounting bracket 401 is provided with a magazine slide rail 404. The side of the web plate of the U-shaped bracket 402 facing away from the support arm is provided with a frame slide groove 409, which is interference-fitted into the magazine slide rail 404, thus forming a detachable connection between the U-shaped bracket 402 and the magazine slide rail 404. The U-shaped frame 402 has a strip-shaped sliding hole 405 on its support arm. Both ends of the L-shaped push plate 403 have sliding levers 406, which are slidably connected to the strip-shaped sliding holes 405 on the two support arms and extend beyond them. The L-shaped push plate 403 supports the pressure arm 802 and the turntable 801 of the nail 8. A limiting plate 407 is fixedly connected to the support arm of the U-shaped frame 402, forming a nail groove 408 between the limiting plate 407 and the support arm. The strip-shaped sliding hole 405 and the nail groove 408 extend in the same direction. The anchor tip 803 of the nail 8 is embedded and slides within the nail groove 408. Under the support of the L-shaped push plate 403, several nails 8 are arranged side-by-side on the U-shaped frame 402. Hooks for hooking the sliding levers 406 are provided on both sides of the gun body 1. By releasing the hook from the limit of the sliding lever 406, the magazine mounting bracket 401 can be rotated from being attached to the gun body 1 to being perpendicular to the gun body 1. Then, by pushing the L-shaped push plate 403 upward through the sliding lever 406, the nail 8 can be pushed out from the end of the U-shaped bracket 402 away from the L-shaped push plate 403. Then, the nail 8 can be installed on the rotating rod 5.

[0064] Furthermore, in this embodiment, as Figures 1 to 9 As shown, the connector and the non-circular slot 805 can be magnetically mated. Both the connector and the non-circular slot 805 are magnetized so that they attract each other.

[0065] In this embodiment, as Figures 1 to 9 As shown, the trigger 3 also includes a trigger protection ring 308, which is fixed on the gun body 1 and the handle 2 to prevent the trigger 3's pulling part 304 from being accidentally activated.

[0066] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A type of nail, characterized in that, The device includes a first rotating arm and a second rotating arm. Both the first and second rotating arms include a central turntable and two end pressure arms. The end pressure arms are symmetrically and staggered around the center of the turntable. An anchor tip is vertically connected to the end of the pressure arm away from the turntable. The turntable of the first and second rotating arms is hinged by a damping shaft. The back side of the turntable of the first and second rotating arms and the pressure side of the turntable of the second rotating arm are provided with rotating grooves for mutual insertion. The rotating grooves have a design depth that allows the pressure sides of the pressure arms of the first and second rotating arms to be flush with each other. The back side of the turntable of the second rotating arm is provided with a non-circular slot for inserting the rotating rod of the pneumatic nail gun.

2. The nail gun according to claim 1, characterized in that, The pressure arm is a rectangular rod, the width of which is equal to the radius of the turntable. The misalignment position of the pressure arm of the first rotating arm is opposite to that of the pressure arm of the second rotating arm.

3. A nail gun according to claim 2, characterized in that, The anchor tip is a right-angled triangle, one of the right-angled sides of which is fixedly connected to the pressure arm. The long right-angled sides of the right-angled triangles on the pressure arms at both ends face opposite directions.

4. A pneumatic nail gun, comprising a gun body and a handle, wherein the gun body is provided with an impact piston for firing a nail as described in any one of claims 1 to 3, the handle is provided with a trigger for actuating the impact piston, and the gun body has a firing port at the tip for sliding the impact piston, characterized in that, A rotating rod is rotatably connected to the gun body. The rotating rod includes a plug-in end extending from the gun head end of the gun body and a rotating end extending from the gun tail end of the gun body. The plug-in end is provided with a plug connector that matches the non-circular slot of the nail. The pressure arm of the nail is located on the movement path of the impact piston. A damping knob is rotatably connected to the gun tail end of the gun body. The rotating end is fixedly connected to the damping knob.

5. A pneumatic nail gun according to claim 4, characterized in that, The gun body has an arc-shaped abutment cover at the gun head end.

6. A pneumatic nail gun according to claim 4, characterized in that, There are two impact pistons, each with a semi-annular firing head. The gun barrel has two semi-annular firing ports at the muzzle end, which are symmetrically arranged with their tops facing away from each other.

7. A pneumatic nail gun according to claim 6, characterized in that, The gun body is provided with a sealed mounting cavity, and the sealed mounting cavity is provided with an air intake channel and an exhaust channel communicating with the outside. The sealed mounting cavity is equipped with a control cylinder and an impact cylinder with a self-contained return air tank. The impact cylinder and the control cylinder are arranged sequentially from the gun head end to the gun tail end of the gun body. The impact cylinder includes a first impact chamber and a second impact chamber divided by the impact piston. The first impact chamber is close to the muzzle end of the gun body, and the second impact chamber is close to the breech end of the gun body. The firing port is connected to the first impact chamber. The semi-annular firing head is located in the first impact chamber. The second impact chamber is provided with an air inlet. The first impact chamber is provided with a return air port and a throttling air port. The return air port and the throttling air port are on the moving path of the impact piston. The return air port and the throttling air port are connected to the return air tank. The control cylinder includes a first control chamber and a second control chamber divided by a control piston. The first control chamber is close to the first impact chamber, and the second control chamber is close to the rear end of the gun body. The first control chamber is provided with a first air inlet, and the second control chamber is provided with a second air inlet. The second air inlet is connected to the exhaust channel. The first air inlet is located on the movement path of the control piston moving towards the second control chamber. The control piston is provided with a sealing end and a through channel. The first control chamber is provided with an end protrusion for the sealing end to be slidably connected in a sealing manner. The through channel connects the end protrusion and the second control chamber. The air inlet is located on the movement path of the sealing end. There is a gas gap between the end protrusion and the air inlet. The gas gap is connected to the sealing mounting cavity. The handle is equipped with a handle air tank, and the handle air tank is equipped with a first air inlet, a second air inlet and an air inlet connector. The first air inlet is connected to the air inlet channel, and the air inlet connector is connected to the high-pressure air supply tank. The trigger includes a three-way housing and a trigger body. The three-way housing includes a main pipe and a branch pipe that are interconnected. One end of the main pipe is connected to the second air inlet through a throttle valve, and the branch pipe is connected to the first air inlet. The trigger body includes a pulling part, a sliding rod part, and a blocking part that can block the throttle valve, which are connected in sequence. The sliding rod part is slidably connected to the other end of the main pipe. The blocking part is located inside the main pipe, and the pulling part is located outside the main pipe. A return spring is provided between the pulling part and the handle. The diameter of the sliding rod part is smaller than that of the main pipe, and the diameter of the blocking part matches that of the main pipe.

8. A pneumatic nail gun according to claim 7, characterized in that, The gun body is equipped with two impact cylinders. The return air tank outside the impact cylinder is semi-cylindrical. The rectangular surfaces of the two return air tanks interlock with each other. The rectangular surface of the return air tank is provided with a rotating rod channel for the rotating rod to be inserted.

9. A pneumatic nail gun according to claim 4, characterized in that, The device includes a nail gun magazine, comprising a magazine mounting bracket, a U-shaped bracket, and an L-shaped push plate. The magazine mounting bracket is hinged to the lower end of the gun head of the gun body. The magazine mounting bracket is provided with a magazine slide rail. The web plate of the U-shaped bracket has a frame slide groove on the side facing away from the support arm. The frame slide groove is slidably connected to the magazine slide rail. The support arm of the U-shaped bracket has a strip-shaped sliding hole. The L-shaped push plate has a sliding lever for slidingly connecting to the strip-shaped sliding hole. The sliding lever extends out of the strip-shaped sliding hole. A limiting plate is fixedly connected to the support arm of the U-shaped bracket. A nail gun slide groove is formed between the limiting plate and the support arm for the anchor tip to be inserted and slid. The extension direction of the strip-shaped sliding hole and the nail gun slide groove is consistent. Hooks for hooking the sliding lever are provided on both sides of the gun body.

10. A pneumatic nail gun according to claim 4, characterized in that, The connector and the non-circular slot can be magnetized.

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