Safety insurance axial nail gun

Abstract

The application discloses a safe and secure axial nail shooting device, relates to the technical field of nail shooting and fastening, and comprises a main sleeve, wherein an insurance device for realizing locking or unlocking of a limiting pin is arranged on the front end of an axial limiting groove of the main sleeve and can rotate around the main sleeve; S1: when the insurance device is controlled to rotate to the locking state, the limiting pin is located at the front end of the axial limiting groove and is locked by the insurance groove of the insurance device, and the nail shooting device is in an inoperable state; and S2: when the insurance device is controlled to rotate to the unlocking state, the limiting pin is located in the axial limiting groove and the giving space gap of the insurance device and is unlocked, and the nail shooting device is in an operable state. The nail shooting device is provided with the insurance device on the main sleeve, the limiting pin can be locked by rotating the insurance device and the nail shooting device cannot be fired before shell ejection of a dud is encountered, no matter how the shell is ejected, the integrated nail cannot be detonated again, and the technical problem that the existing nail shooting device is prone to hurting people when shell ejection of a dud is encountered is solved.

Description

Technical Field

[0001] This invention relates to the field of nail fastening technology, and specifically to a safety-safe axial nail gun. Background Technology

[0002] A nail gun is a fastening tool that uses a firing pin to fire a single-piece nail, and the thrust generated by the explosion of the nail quickly drives the nail into the substrate. With the development of nail fastening technology, nail guns are increasingly widely used in various industries due to their advantages such as light weight, good fastening effect, and ease of use.

[0003] Currently, most nail guns on the market are axial in structure. For example, patent application CN109940557A discloses a fast-release axial nail gun. This type of nail gun mainly includes a main sleeve, a movable sleeve, a nail tube, a firing pin body (including a pin shaft and a pin seat), a firing pin sleeve, a braking pin (firing pin), a limiting pin (cylindrical pin), and a spring. The axial movement of the firing pin body is limited by simultaneously inserting the limiting pin into a positioning pin hole in the firing pin body, a symmetrically arranged slot in the firing pin sleeve, and a symmetrically arranged axial limiting groove on the rear section of the main sleeve, thus ensuring stable and reliable firing. However, in actual use, due to various reasons, duds may occur where the nail cartridge in the integrated nail is not fired, meaning the cartridge in the integrated nail is not detonated inside the nail tube. If the main sleeve pushes the firing pin body into the nail tube to release the dud cartridge, the cartridge may be detonated when the firing pin touches the integrated nail, posing a potential safety hazard. Summary of the Invention

[0004] This invention addresses the safety hazard of existing nail guns, which are prone to re-explosion and injury when encountering unexploded ordnance. It provides a safe and secure axial nail gun. This nail gun incorporates a safety device on the main sleeve. Before encountering unexploded ordnance, the safety device can be rotated to lock the limiting pin, thereby locking the firing pin body, braking pin, and firing pin sleeve, preventing movement. This ensures safety during unexploded ordnance ejection, regardless of the ejection method, and solves the technical problem of injury caused by unexploded ordnance in existing nail guns.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A safety-safe axial nail gun includes a main sleeve, on which a safety device is provided at the front end of the axial limiting groove, which can rotate around the main sleeve to achieve a locking or unlocking state of the limiting pin. S1: When the control safety device is rotated to the locked state, the limit pin is located at the front end of the axial limit groove and is locked by the safety groove of the safety device. The firing pin body, brake pin, and firing pin sleeve are all locked and cannot move, and the nail gun is in a state where it cannot fire. S2: When the control safety device is rotated to the unlocked state, the limit pin is located in the axial limit groove and the clearance notch of the safety device and is unlocked. The limit pin can move in the axial limit groove, and the nail gun is in the firing state.

[0006] The safety groove and the clearance notch are symmetrically formed on the side wall of the safety device. When the safety device is rotated to the locked state, the clearance notch is misaligned with the axial limiting groove, and the two ends of the limiting pin are respectively locked by the safety groove to the front end of the axial limiting groove. When the safety device is rotated to the unlocked state, the clearance notch communicates with the axial limiting groove, and the safety device releases the locking of the limiting pin.

[0007] The safety device includes an integrally formed front rotating ring and a rear safety ring, with a safety groove formed on the rear safety ring and a clearance notch formed on the end face of the rear safety ring and located at one end of the safety groove.

[0008] The outer diameter of the front rotating ring is larger than the outer diameter of the rear safety ring. There is a second outer step between the front rotating ring and the rear safety ring. The protective sleeve of the nail gun is set between the second outer step and the connecting handle. The rear safety ring is set inside the front end of the protective sleeve.

[0009] The front rotating ring is a conical structure, a curved surface structure, a ring structure, or a combination of conical and ring structures, and the rear safety ring is a ring structure.

[0010] The main sleeve includes a front sleeve and a rear sleeve. The outer diameter of the front sleeve is larger than that of the rear sleeve. There is a first outer step between the front sleeve and the rear sleeve. An axial limiting groove is located on the rear sleeve. The front end of the axial limiting groove refers to the connection point between the front sleeve and the rear sleeve. An inner step adapted to the first outer step is provided between the front rotating ring and the rear safety ring. The front rotating ring and the rear safety ring are located on the front sleeve and the rear sleeve, respectively.

[0011] The rear end of the front sleeve is provided with an annular groove, and a positioning pin with its end extending into the annular groove is fixed on the front rotating ring.

[0012] The end of the positioning pin is provided with a retractable ball, and the bottom of the annular groove is provided with a locking positioning hole and an unlocking positioning hole that are adapted to the retractable ball. Under the action of the safety device, the positioning pin can slide between the locking positioning hole and the unlocking positioning hole. In the locked state, the retractable ball is located in the locking positioning hole, and the locking positioning hole and the retractable ball cooperate to position the safety device. In the unlocked state, the retractable ball is located in the unlocking positioning hole, and the unlocking positioning hole and the retractable ball cooperate to position the safety device.

[0013] The locking positioning hole and the unlocking positioning hole form an angle of 30-60 degrees with the extended axis of their respective axes.

[0014] The positioning pins are symmetrically fixed to the front rotating ring by a threaded connection structure, and the number of locking positioning holes and unlocking positioning holes are the same as the number of positioning pins.

[0015] Both the locking and unlocking positioning holes are hemispherical or conical.

[0016] The advantages of using this invention are: 1. The key innovation of this invention lies in the addition of a safety device on the main sleeve capable of locking and unlocking the limiting pin. When encountering a dud bullet during use and before ejection, the safety device can be rotated to the locked position. This locks the limiting pin in place at the front end of the axial limiting groove, preventing movement. Consequently, the firing pin body, brake pin, and firing pin sleeve are also locked and cannot move. At this point, the nail gun is in a non-firing state, and regardless of how the bullet is ejected, the integrated nail cannot be detonated again, ensuring safety during dud bullet ejection and avoiding the risk of injury. After the dud bullet is ejected, simply rotating the safety device to the unlocked position releases the locking restriction of the limiting pin. The limiting pin can then move normally within the axial limiting groove, and the nail gun is ready to fire, allowing normal firing of the integrated nail. This invention allows locking and unlocking of the limiting pin simply by rotating the safety device, offering advantages such as simple structure, convenient operation, and strong practicality.

[0017] 2. This invention utilizes symmetrically designed safety grooves, enabling the safety device to lock the limiting pins from both ends, thus improving the stability and reliability of the locking mechanism. If only a single safety groove is used, not only will the stability be poor and the safety groove itself be easily damaged, but the limiting structure of the nail gun will also be easily damaged.

[0018] 3. The present invention divides the safety device into a front rotating ring and a rear safety ring, and makes the outer diameter of the front rotating ring larger than that of the rear safety ring. This facilitates the rotation adjustment of the safety device, the positioning and installation of the nail gun protective sleeve, and also helps to hide the rear safety ring, the safety groove and the clearance notch inside the protective sleeve.

[0019] 4. The present invention can set the front rotating ring as a conical structure, a curved surface structure, a ring structure, or a combination of conical and ring structures, and set the rear safety ring as a ring structure, which has the advantages of conforming to human hand ergonomics, easy operation, and beautiful appearance.

[0020] 5. The invention, through the cooperation of the first outer step and the inner step, helps to prevent the safety device from falling out of the front cover when it is in the unlocked state.

[0021] 6. The present invention, through the cooperation of the annular groove and the positioning pin, can play a guiding role when the safety device rotates, thereby making the rotation of the safety device more stable, flexible and accurate.

[0022] 7. This invention, through the cooperation of a retractable ball bearing, a locking positioning hole, and an unlocking positioning hole, can position the safety device in both the locked and unlocked states. Specifically, when the retractable ball bearing on the positioning pin enters the locking or unlocking positioning hole, the safety device will be positioned and unable to rotate freely. This structure improves the stability and reliability of the safety device in both locked and unlocked states, and prevents locking or unlocking failures due to accidental slippage. Furthermore, when the safety device rotates, the retractable ball bearing is compressed, without affecting its normal rotation.

[0023] 8. The present invention sets the angle between the extension lines of the locking positioning hole and the unlocking positioning hole to 30-60 degrees, which is beneficial for the safety device to achieve state switching under the premise of rotating a small angle, thereby making the locking and unlocking operation of the nail gun more convenient.

[0024] 9. The symmetrical positioning pins of this invention help to further improve the stability of the guide.

[0025] 10. In this invention, both the locking positioning hole and the unlocking positioning hole are designed as hemispherical or conical holes, which facilitates accurate compression of the retractable ball when controlling the rotation of the safety device, thereby allowing the safety device to be rotated with a smaller force. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the planar structure of the safety device in the locked state; Figure 2 for Figure 1 A schematic diagram of the AA cross-sectional structure; Figure 3 This is a three-dimensional structural diagram of the safety device in the locked state; Figure 4 This is a schematic diagram of the planar structure of the safety device in the unlocked state; Figure 5 for Figure 4 Schematic diagram of the BB cross-sectional structure; Figure 6 This is a three-dimensional structural diagram of the safety device in the unlocked state; Figure 7 This is a schematic diagram of the front view structure of the safety device; Figure 8 for Figure 7 CC cross-sectional view of the structure; Figure 9 This is a schematic diagram of the right-side plan view of the safety device. Figure 10 This is a schematic diagram of the left-side plan view of the safety device; Figure 11 A three-dimensional structural diagram of the safety device (I); Figure 12 A three-dimensional structural diagram of the safety device (II); Figure 13 A schematic diagram of the main unit's floor plan; Figure 14 for Figure 13 Schematic diagram of the DD cross-sectional structure; Figure 15 for Figure 13 A schematic diagram of the EE cross-sectional structure; Figure 16 A schematic diagram of the three-dimensional structure of the main unit; Figure 17 A schematic diagram of the planar assembly structure of a nail gun; Figure 18 A schematic diagram of the three-dimensional assembly structure of a nail gun; Figure 19 A three-dimensional structural diagram of the assembled nail gun; Figure 20 This is a schematic diagram of the nail gun in the unlocked state. Figure 21 for Figure 20 A schematic diagram of the FF cross-sectional structure; Figure 22 for Figure 21 Schematic diagram of the cross-sectional structure of GG; Figure 23 This is a schematic diagram of the nail gun in the locked state. Figure 24 for Figure 23 A schematic diagram of the cross-sectional structure of the penis; Figure 25 for Figure 24 A schematic diagram of the KK cross-sectional structure.

[0027] The markings in the diagram are as follows: 1. Main sleeve, 2. Axial limiting groove, 3. Safety device, 4. Limiting pin, 5. Safety groove, 6. Relief notch, 7. Front rotating ring, 8. Rear safety ring, 9. Inner step, 10. First outer step, 11. Ring groove, 12. Unlocking positioning hole, 13. Locking positioning hole, 14. Positioning pin, 15. Silencing sleeve assembly, 16. Pin tube sleeve, 17. Firing pin sleeve, 18. Movable sleeve, 19. Return spring, 20. Firing pin body, 21. Protective sleeve, 22. Firing spring, 23. Brake pin, 24. Connecting handle, 25. Grip, 26. Front sleeve, 27. Rear sleeve. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0029] Example 1 like Figure 1-19 As shown, this embodiment provides a safety-locking axial nail gun. The safety-locking structure includes a main sleeve 1, which comprises a front sleeve 26 and a rear sleeve 27. The outer diameter of the front sleeve 26 is larger than that of the rear sleeve 27. A first outer step 10 is provided between the front sleeve 26 and the rear sleeve 27. The rear sleeve 27 is provided with an axial limiting groove 2, and a limiting pin 4 penetrating the firing pin sleeve 17 and the firing pin body 20 is provided within the axial limiting groove 2. Crucially, the main sleeve 1 has a safety device 3 at the front end of the axial limiting groove 2, which can rotate around the main sleeve 1 to achieve a locked or unlocked state for the limiting pin 4. S1: When the control safety device 3 is rotated to the locked state, the limit pin 4 is located at the front end of the axial limit groove 2 and is locked by the safety groove 5 of the safety device 3. At this time, the firing pin body 20, the brake pin 23, and the firing pin sleeve 17 are all locked and cannot move, and the nail gun is in a state where it cannot fire. S2: When the control safety device 3 is rotated to the unlocked state, the limit pin 4 is located in the axial limit groove 2 and the clearance notch 6 of the safety device 3 and is unlocked. At this time, the limit pin 4 can move in the axial limit groove 2, and the firing pin body 20, the brake pin 23, and the firing pin sleeve 17 are all unlocked and can move. The nail gun is in the firing state.

[0030] Those skilled in the art will understand that the aforementioned front end of the axial limiting groove 2 refers to the connection point between the front sleeve 26 and the rear sleeve 27 near the front end of the axial limiting groove 2.

[0031] In this embodiment, by controlling the rotation of the safety device 3, the system can switch between a locked state and an unlocked state, thereby enabling the nail gun to switch between a firing state and a non-firing state. When encountering a dud, simply rotating the safety device 3 to the locked state will lock the limiting pin 4, firing pin body 20, braking pin 23, and firing pin sleeve 17, preventing them from moving. At this time, no matter how the casing is ejected, the integrated nail cannot be detonated again, ensuring the safety of the dud during ejection. After ejection, simply rotating the safety device 3 to the unlocked state will release the locking of the limiting pin 4. At this time, the limiting pin 4, firing pin body 20, braking pin 23, and firing pin sleeve 17 can all move normally, and the nail gun can fire the nail cartridge normally.

[0032] According to a preferred embodiment of this example, such as Figure 1-12As shown, the safety groove 5 and the clearance notch 6 are symmetrically formed on the side wall of the safety device 3, and the safety groove 5 and the clearance notch 6 are connected. The width of the clearance notch 6 is equal to or slightly larger than the width of the axial limiting groove 2. When the safety device 3 is rotated to the locked state, the clearance notch 6 is misaligned with the axial limiting groove 2, and the clearance notch 6 and the axial limiting groove 2 are not connected. At this time, both ends of the limiting pin 4 are locked to the front end of the axial limiting groove 2 by the safety groove 5, and the limiting pin 4 cannot move within the axial limiting groove 2. When the safety device 3 is rotated to the unlocked state, the clearance notch 6 is connected to the axial limiting groove 2. At this time, the safety device 3 releases the locking of the limiting pin 4, and the limiting pin 4 can move within the axial limiting groove 2.

[0033] It should be noted that this embodiment does not limit the specific structure of the safety device 3. Any structural component that can cooperate with the limit pin 4 and achieve the above functions is acceptable.

[0034] like Figure 17-19 As shown, the above-mentioned nail gun also includes a silencer sleeve assembly 15, a nail tube sleeve 16, a firing pin sleeve 17, a movable sleeve 18, a return spring 19, a firing pin body 20, a protective sleeve 21, a firing spring 22, a connecting handle 24, a grip 25, a braking pin 23, and other structural components. The structure, position, and connection relationship of the aforementioned components are all existing conventional technologies and will not be described in detail.

[0035] The implementation principle of this embodiment is as follows: When the nail gun encounters a dud during firing and needs to eject the spent cartridge, such as Figure 1-3 As shown in Figures 23-25, first control the safety device 3 to rotate to the locked state, causing the clearance notch 6 to misalign with the axial limiting groove 2. At this time, the clearance notch 6 and the axial limiting groove 2 are not connected. The safety device 3 locks the limiting pin 4 to the front end of the axial limiting groove 2 through the safety groove 5. Correspondingly, the firing pin body 20, the brake pin 23, and the firing pin sleeve 17 are all locked and cannot move. The brake pin 23 cannot contact the firing surface, the firing pin cannot be released, and the nail gun is in a non-firing state. At this time, no matter what method is used to eject the shell, the integral nail in the nail tube cannot be detonated again, ensuring the safety of the unexploded shell ejection and avoiding the risk of injury. After the unexploded shell is ejected, as Figure 4-6 As shown in Figures 20-22, first control the safety device 3 to rotate to the unlocked state, so that the clearance notch 6 communicates with the axial limiting groove 2. At this time, the safety device 3 releases the lock on the limiting pin 4, and the limiting pin 4, firing pin body 20, braking pin 23, and firing pin sleeve 17 can all move normally. The nail gun is in the firing state and can fire the nail cartridge normally.

[0036] Example 2 This embodiment further optimizes the safety and security structure of the nail gun based on Embodiment 1.

[0037] like Figure 7-12As shown, the safety device 3 includes an integrally formed front rotating ring 7 and a rear safety ring 8. The front rotating ring 7 and the rear safety ring 8 are located on the front sleeve 26 and the rear sleeve 27, respectively. An inner step 9 is provided between the front rotating ring 7 and the rear safety ring 8, which is adapted to the first outer step 10 on the main sleeve 1. During installation, the safety device 3 can be sleeved onto the main sleeve 1 from the rear end of the rear sleeve 27. Under the limiting action of the cooperation between the first outer step 10 and the inner step 9, the axial forward movement of the safety device 3 can be restricted and it can be prevented from falling out of the front sleeve 26, thus ensuring better stability of the safety device 3 on the main sleeve 1. The outer diameter of the front rotating ring 7 is larger than the outer diameter of the rear safety ring 8. The outer diameter of the rear safety ring 8 is matched with the inner diameter of the protective sleeve 21 on the nail gun. A second outer step is formed between the front rotating ring 7 and the rear safety ring 8. The protective sleeve 21 of the nail gun is located between the second outer step and the connecting handle 24. The rear safety ring 8 is located inside the front end of the protective sleeve 21. After the nail gun is assembled, the rear safety ring 8 and its safety groove 5 and clearance notch 6 are all located inside the protective sleeve 21.

[0038] Furthermore, the safety groove 5 is formed on the rear safety ring 8, and the clearance notch 6 is formed on the end face of the rear safety ring 8 and located at one end of the safety groove 5, making the state switching of the safety device 3 more accurate and reliable.

[0039] According to a preferred embodiment of this example, such as Figure 7-12 As shown, the front rotating ring 7 can be a conical structure, a curved surface structure, a ring structure, or a combination of conical and ring structures, and the rear safety ring 8 can be a ring structure. It has the advantages of conforming to human hand ergonomics, easy operation, and beautiful appearance.

[0040] Example 3 This embodiment further optimizes the safety and security structure of the nail gun based on embodiment 2.

[0041] like Figure 1-19 As shown, the rear end of the front sleeve 26 is provided with an annular groove 11. The front rotating ring 7 is fixed with a positioning pin 14 whose end extends into the annular groove 11 through a threaded connection structure. The positioning pin 14 extends into the annular groove 11 through its end, which plays a role in rotating and guiding the safety device 3, so that the safety device 3 can only rotate radially on the main sleeve 1 and cannot move axially.

[0042] According to a preferred embodiment of this example, such as Figure 1-16As shown, the end of the positioning pin 14 is provided with a retractable ball, and the bottom of the annular groove 11 is provided with a locking positioning hole 13 and an unlocking positioning hole 12 adapted to the retractable ball. Both the locking positioning hole 13 and the unlocking positioning hole 12 are hemispherical or conical holes. Under the drive of the safety device 3, the positioning pin 14 can slide smoothly between the locking positioning hole 13 and the unlocking positioning hole 12; and when the safety device 3 is in the locked state, the retractable ball is located in the locking positioning hole 13. At this time, the locking positioning hole 13 and the retractable ball cooperate to position the safety device 3, so that the safety device 3 cannot rotate freely without the action of external force, thereby ensuring a stable and reliable locking effect. When the safety device 3 is in the unlocked state, the retractable ball is located in the unlocking positioning hole 12. At this time, the unlocking positioning hole 12 and the retractable ball cooperate to position the safety device 3, so that the safety device 3 cannot rotate freely without the action of external force, thereby ensuring a stable and reliable unlocking effect. Of course, the above-mentioned positioning structure is the preferred embodiment, and an equivalent positioning structure can be used instead in actual applications.

[0043] Furthermore, the number of the aforementioned positioning pins 14 is at least one, but considering the structure, cost, and stability, it is preferable that the number of positioning pins 14 is two and symmetrically fixed on the front rotating ring 7. Correspondingly, the number of locking positioning holes 13 and the number of unlocking positioning holes 12 are the same as the number of positioning pins 14.

[0044] Furthermore, such as Figure 15 As shown, when there are two locking positioning holes 13 and two unlocking positioning holes 12, the extended axis of two adjacent locking positioning holes 13 and unlocking positioning holes 12 forms an angle of 30-60 degrees. Preferably, the extended axis of two adjacent locking positioning holes 13 and unlocking positioning holes 12 forms an angle of 45 degrees, so as to achieve the state switching of the safety device 3 with a small rotation angle, thereby making the locking and unlocking operation of the nail gun more convenient.

[0045] The implementation principle of this embodiment is as follows: When the nail gun encounters a dud during firing and needs to eject the spent cartridge, such as Figure 1-3As shown in Figures 23-25, the safety device 3 is rotated to the locked state, causing the clearance notch 6 to misalign with the axial limiting groove 2. At this time, the safety device 3 locks the limiting pin 4 to the front end of the axial limiting groove 2 through the safety groove 5. The retractable ball on the positioning pin 14 is located in the locking positioning hole 13, forming a locking position for the safety device 3, preventing the safety device 3 from rotating freely without external force, thus achieving a stable and reliable locking effect. Correspondingly, the firing pin body 20, the braking pin 23, and the firing pin sleeve 17 are all locked and cannot move. The braking pin 23 cannot contact the firing surface, and the firing pin cannot be released. At this time, the nail gun is in a non-firing state. Regardless of the method of ejection, the integral nail in the nail tube cannot be detonated again, ensuring the safety of the unexploded cartridge ejection and avoiding the risk of injury. After the unexploded cartridge ejection is completed, as Figure 4-6 As shown in Figures 20-22, the safety device 3 is rotated to the unlocked state, making the clearance notch 6 communicate with the axial limiting groove 2. At this time, the safety device 3 releases the lock on the limiting pin 4, and the retractable ball on the positioning pin 14 is located in the unlocking positioning hole 12, forming an unlocked positioning for the safety device 3, preventing the safety device 3 from rotating freely without external force, thereby achieving a stable and reliable unlocking effect. Correspondingly, the limiting pin 4, the firing pin body 20, the braking pin 23, and the firing pin sleeve 17 can all move, the nail gun is in a firing state, and can normally fire the nail cartridge.

[0046] The above description is merely a specific embodiment of the present invention. Any feature disclosed in this specification may be replaced by other equivalent or similar features unless otherwise specified. All features or steps in all methods or processes disclosed may be combined in any way except for mutually exclusive features and / or steps.

Claims

1. A safety-safe axial nail gun, comprising a main sleeve (1), characterized in that: The main sleeve (1) is provided with a safety device (3) located at the front end of the axial limiting groove (2), which can rotate around the main sleeve (1) to lock or unlock the limiting pin (4); the method also includes the following steps: S1: When the control safety device (3) is rotated to the locked state, the limit pin (4) is located at the front end of the axial limit groove (2) and is locked by the safety groove (5) of the safety device (3). The firing pin body (20), the brake pin (23), and the firing pin sleeve (17) are all locked and cannot move, and the nail gun is in a state where it cannot fire. S2: When the control safety device (3) is rotated to the unlocked state, the limit pin (4) is located in the axial limit groove (2) and the clearance notch (6) of the safety device (3) and is unlocked. The limit pin (4) can move in the axial limit groove (2) and the nail gun is in the firing state. The safety groove (5) and the clearance notch (6) are symmetrically opened on the side wall of the safety device (3). When the safety device (3) is rotated to the locked state, the clearance notch (6) is misaligned with the axial limiting groove (2), and the two ends of the limiting pin (4) are respectively locked by the safety groove (5) at the front end of the axial limiting groove (2). When the safety device (3) is rotated to the unlocked state, the clearance notch (6) communicates with the axial limiting groove (2), and the safety device (3) releases the locking of the limiting pin (4). The safety device (3) includes an integrally formed front rotating ring (7) and a rear safety ring (8), with a safety groove (5) formed on the rear safety ring (8) and a clearance notch (6) formed on the end face of the rear safety ring (8) and located at one end of the safety groove (5); The main sleeve (1) includes a front sleeve (26) and a rear sleeve (27). The outer diameter of the front sleeve (26) is larger than that of the rear sleeve (27). There is a first outer step (10) between the front sleeve (26) and the rear sleeve (27). An axial limiting groove (2) is located on the rear sleeve (27). The front end of the axial limiting groove (2) refers to the connection between the front sleeve (26) and the rear sleeve (27). An inner step (9) adapted to the first outer step (10) is provided between the front rotating ring (7) and the rear safety ring (8). The front rotating ring (7) and the rear safety ring (8) are located on the front sleeve (26) and the rear sleeve (27), respectively. The rear end of the front sleeve (26) is provided with an annular groove (11), and a positioning pin (14) with its end extending into the annular groove (11) is fixed on the front rotating ring (7). The end of the positioning pin (14) is provided with a retractable ball. The bottom of the annular groove (11) is provided with a locking positioning hole (13) and an unlocking positioning hole (12) that are adapted to the retractable ball. Under the drive of the safety device (3), the positioning pin (14) can slide between the locking positioning hole (13) and the unlocking positioning hole (12). In the locked state, the retractable ball is located in the locking positioning hole (13), and the locking positioning hole (13) and the retractable ball cooperate to position the safety device (3). In the unlocked state, the retractable ball is located in the unlocking positioning hole (12), and the unlocking positioning hole (12) and the retractable ball cooperate to position the safety device (3).

2. The safety-protected axial nail gun according to claim 1, characterized in that: The outer diameter of the front rotating ring (7) is larger than the outer diameter of the rear safety ring (8). There is a second outer step between the front rotating ring (7) and the rear safety ring (8). The protective sleeve (21) of the nail gun is located between the second outer step and the connecting handle (24). The rear safety ring (8) is located inside the front end of the protective sleeve (21).

3. The safety-protected axial nail gun according to claim 1, characterized in that: The locking positioning hole (13) and the unlocking positioning hole (12) form an angle of 30-60 degrees along their axial extension lines.

4. A safety-safe axial nail gun according to claim 1, characterized in that: The positioning pins (14) are symmetrically fixed on the front rotating ring (7) through a threaded connection structure. The number of locking positioning holes (13) and unlocking positioning holes (12) are the same as the number of positioning pins (14).

5. A safety-safe axial nail gun according to claim 1, characterized in that: Both the locking positioning hole (13) and the unlocking positioning hole (12) are hemispherical or conical.

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