Pneumatic nail gun

Abstract

The utility model discloses a pneumatic nail gun which comprises an air cylinder, a piston connected with a firing pin and a bottom cover arranged at the tail of the air cylinder, the piston is in sliding fit with the inner circumferential wall of the air cylinder, a protrusion is arranged on the face, away from the firing pin, of the piston, a limiting plug is arranged in the bottom cover, and the limiting plug is provided with a groove movably matched with the protrusion. After nail shooting is completed, air pressure pushes the piston to move towards the bottom cover till the protrusion on the piston enters the groove, the piston is limited through the limiting plug, after the air pressure in the air cylinder disappears, the piston is connected with the limiting plug in a matched mode, the piston cannot freely slide in the air cylinder, preparation is made for the next time that the piston is pushed by the air pressure to beat gun nails, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nail guns, in particular to a pneumatic nail gun. Background Art

[0002] Pneumatic tools are tools that use compressed air as a power source to output kinetic energy. As a pneumatic tool, an air nail gun includes a gun nozzle, a cylinder connected to the gun nozzle, and a driving piston that can reciprocate in the cylinder. The air pressure generated by the air pump in the cylinder is used as a power source. The driving piston drives the firing pin to hammer the nail into the object or shoot the nail out. However, when the air nail gun is not working, there is no air pressure in the cylinder. The piston and firing pin are easy to slide along the inner wall of the cylinder under the action of gravity. If the piston slides to a position close to the gun nozzle, when hitting the nail, it is necessary to use air pressure to push the piston to the tail of the cylinder (that is, the end of the cylinder away from the gun nozzle), resulting in reduced nail shooting efficiency. Utility Model Content

[0003] In view of the above problems, the utility model provides a pneumatic nail gun, in which a piston is matched with a limit plug so that the piston will not slide randomly in the cylinder, thereby improving work efficiency.

[0004] The technical solution adopted by the utility model is as follows: a pneumatic nail gun includes a cylinder, a piston connected to a firing pin and a bottom cover arranged at the tail of the cylinder, the piston slidingly cooperates with the inner circumferential wall of the cylinder, a protrusion is provided on the side of the piston facing away from the firing pin, a limit plug is provided inside the bottom cover, and the limit plug is provided with a groove that movably cooperates with the protrusion.

[0005] Optionally, the limiting plug includes a first limiting portion and a second limiting portion connected to the first limiting portion, the outer peripheral wall of the first limiting portion is tightly fitted and connected to the inner peripheral wall of the bottom cover, and the second limiting portion is provided with the groove.

[0006] Optionally, a first annular groove is provided between the two ends of the protrusion, one end of the second limiting portion is connected to the first limiting portion, and the inner wall of the other end of the second limiting portion is provided with a first annular protrusion matching the first annular groove.

[0007] Optionally, a plurality of notches are provided at intervals along the circumferential direction at one end of the second limiting portion away from the first limiting portion.

[0008] Optionally, the diameter of the second limiting portion is smaller than the diameter of the first limiting portion, one end of the second limiting portion is located inside the first limiting portion and connected to the first limiting portion, the other end of the second limiting portion extends outside the first limiting portion, and there is a cavity between the inner circumferential wall of the first limiting portion and the outer circumferential wall of the second limiting portion, and a plurality of first supporting ribs are arranged at intervals in the cavity.

[0009] Optionally, the first limiting portion is provided with a second annular protrusion, and the inner peripheral wall of the bottom cover is provided with a second annular groove matching with the second annular protrusion.

[0010] Optionally, a plurality of second supporting ribs are provided at intervals on the outer peripheral wall of the first limiting portion.

[0011] Optionally, a buffer plug is provided inside the end of the cylinder away from the bottom cover, the striker passes through the buffer plug, and the piston movably abuts against the buffer plug.

[0012] Optionally, the piston is provided with a third ring groove, a wear-resistant ring is installed in the third ring groove, and the wear-resistant ring protrudes out of the third ring groove.

[0013] Optionally, the cylinder is connected to the bottom cover via threads.

[0014] The beneficial effect of the utility model is that after the nail shooting is completed, the air pressure pushes the activity to move toward the bottom cover until the protrusion on the piston enters the groove, and the limit plug limits the piston. When the air pressure in the cylinder disappears, the piston and the limit plug are matched and connected, so that the piston will not slide freely in the cylinder, and prepare for the next time the piston is pushed by the air pressure to hit the gun nail, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a pneumatic nail gun proposed in an embodiment of the utility model;

[0016] Figure 2 A structural diagram of a limit stopper for a pneumatic nail gun according to an embodiment of the utility model;

[0017] Figure 3 A schematic diagram of a piston of a pneumatic nail gun according to an embodiment of the utility model.

[0018] The marks in the accompanying drawings are: 1. cylinder; 2. piston; 3. bottom cover; 4. protrusion; 5. groove; 6. first limiting portion; 7. second limiting portion; 8. first ring groove; 9. first ring convex; 10. notch; 11. first supporting rib; 12. second ring convex; 13. second ring groove; 14. second supporting rib; 15. buffer plug; 16. third ring groove; 17. wear-resistant ring; 18. firing pin. DETAILED DESCRIPTION

[0019] The utility model is described in detail below in conjunction with the accompanying drawings.

[0020] like Figures 1 to 3As shown, this embodiment discloses a pneumatic nail gun, including a cylinder 1, a piston 2 connected to a firing pin 18, and a bottom cover 3 arranged at the tail of the cylinder 1, wherein the piston 2 is slidably matched with the inner peripheral wall of the cylinder 1, a protrusion 4 is provided on the side of the piston 2 facing away from the firing pin 18, and a stopper is provided inside the bottom cover 3, wherein the stopper is provided with a groove 5 that movably matches the protrusion 4. After nail shooting is completed, the air pressure pushes the piston 2 to move toward the bottom cover 3 until the protrusion 4 on the piston 2 enters the groove 5, and the stopper limits the piston 2. When the air pressure in the cylinder 1 disappears, the piston 2 is matched and connected with the stopper, and will not slide freely in the cylinder 1, so as to prepare for the piston 2 to be pushed by the air pressure to hit the nail next time, thereby improving work efficiency.

[0021] like Figure 2 As shown, the stopper includes a first stopper 6 and a second stopper 7 connected to the first stopper 6, the outer peripheral wall of the first stopper 6 is tightly matched with the inner peripheral wall of the bottom cover 3, and the second stopper 7 is provided with the groove 5. The first stopper 6 and the second stopper 7 are an integrally formed structure.

[0022] In this embodiment, if Figure 2 As shown, a first annular groove 8 is provided between the two ends of the protrusion 4, one end of the second limiting portion 7 is connected to the first limiting portion 6, and the inner wall of the other end of the second limiting portion 7 is provided with a first annular protrusion 9 that matches the first annular groove 8. When the protrusion 4 enters the groove 5, the first annular groove 8 on the protrusion 4 and the first annular protrusion 9 on the second limiting portion 7 are engaged with each other, which plays a certain degree of fixing effect on the piston 2.

[0023] In this embodiment, if Figure 2 As shown, the second limiting portion 7 is provided with a plurality of notches 10 at intervals along the circumferential direction at one end away from the first limiting portion 6. The notches 10 increase the outward expansion force of the free end of the second limiting portion 7. When the cylinder 1 is inflated, the air pressure can push the protrusion 4 on the piston 2 to disengage from the groove 5 and move forward.

[0024] like Figure 2 As shown, the diameter of the second limiting portion 7 is smaller than that of the first limiting portion 6, one end of the second limiting portion 7 is located inside the first limiting portion 6 and connected to the first limiting portion 6, and the other end of the second limiting portion 7 extends outside the first limiting portion 6, and there is a cavity between the inner peripheral wall of the first limiting portion 6 and the outer peripheral wall of the second limiting portion 7, and a plurality of first supporting ribs 11 are arranged in the cavity at intervals. The cavity facilitates the extrusion of the first limiting portion 6, and the first limiting portion 6 is smoothly inserted into the bottom cover 3, and the first supporting ribs 11 enhance the strength of the first limiting portion 6 itself.

[0025] In this embodiment, if Figure 1As shown, the first limiting portion 6 is provided with a second annular protrusion 12, and the inner peripheral wall of the bottom cover 3 is provided with a second annular groove 13 that cooperates with the second annular protrusion 12. The second annular groove 13 cooperates with the second annular protrusion 12, so that the limiting plug and the bottom cover 3 are closely matched.

[0026] In this embodiment, if Figure 2 As shown, a plurality of second support ribs 14 are provided at intervals on the outer peripheral wall of the first limiting portion 6. The second support ribs 14 also further increase the support strength of the first limiting portion 6.

[0027] like Figure 1 As shown, a buffer plug 15 is provided inside the end of the cylinder 1 away from the bottom cover 3, and the firing pin 18 passes through the buffer plug 15, and the piston 2 movably abuts against the buffer plug 15. When the air pressure drives the piston 2 to move forward until the piston 2 abuts against the buffer plug 15 to play a buffering role, at this time, the firing pin 18 enters the gun mouth to hit the nail.

[0028] like Figure 1 As shown, the piston 2 is provided with a third annular groove 16, in which a wear-resistant ring 17 is installed, and the wear-resistant ring 17 protrudes from the third annular groove 16. When the piston 2 reciprocates in the cylinder 1, the wear-resistant ring 17 slides against the inner wall of the cylinder 1. The cylinder 1 is connected to the bottom cover 3 by threads. The cylinder 1 and the bottom cover 3 can also be connected by a snap-fit ​​structure.

[0029] The above description is only a preferred embodiment of the utility model, and does not limit the patent protection scope of the utility model. Any equivalent structural transformation made using the contents of the utility model specification and drawings, directly or indirectly used in other related technical fields, is also included in the protection scope of the utility model.

Claims

1. A pneumatic nail gun, characterized in that: It includes a cylinder, a piston connected to a striker, and a bottom cover arranged at the tail of the cylinder. The piston is slidably matched with the inner wall of the cylinder. A protrusion is provided on the side of the piston facing away from the striker. A limit plug is provided inside the bottom cover, and the limit plug is provided with a groove that movably cooperates with the protrusion.

2. The pneumatic nail gun according to claim 1, characterized in that: The limiting plug includes a first limiting portion and a second limiting portion connected to the first limiting portion, the outer peripheral wall of the first limiting portion is tightly matched with the inner peripheral wall of the bottom cover, and the second limiting portion is provided with the groove.

3. The pneumatic nail gun according to claim 2, characterized in that: A first annular groove is provided between the two ends of the protrusion, one end of the second limiting portion is connected to the first limiting portion, and the inner wall of the other end of the second limiting portion is provided with a first annular protrusion matched with the first annular groove.

4. The pneumatic nail gun according to claim 3, characterized in that: An end of the second limiting portion away from the first limiting portion is provided with a plurality of notches at intervals along the circumferential direction.

5. The pneumatic nail gun according to claim 2, characterized in that: The diameter of the second limiting portion is smaller than that of the first limiting portion, one end of the second limiting portion is located inside the first limiting portion and connected to the first limiting portion, the other end of the second limiting portion extends outside the first limiting portion, and a cavity is provided between the inner circumferential wall of the first limiting portion and the outer circumferential wall of the second limiting portion, and a plurality of first supporting ribs are arranged in the cavity.

6. The pneumatic nail gun according to claim 2, characterized in that: The first limiting portion is provided with a second annular protrusion, and the inner peripheral wall of the bottom cover is provided with a second annular groove matched with the second annular protrusion.

7. The pneumatic nail gun according to claim 2, characterized in that: A plurality of second supporting ribs are arranged at intervals on the outer peripheral wall of the first limiting portion.

8. The pneumatic nail gun according to claim 1, characterized in that: A buffer plug is arranged inside the end of the cylinder away from the bottom cover, the striker passes through the buffer plug, and the piston movably abuts against the buffer plug.

9. The pneumatic nail gun according to claim 1, characterized in that: The piston is provided with a third ring groove, a wear-resistant ring is installed in the third ring groove, and the wear-resistant ring protrudes from the third ring groove.

10. The pneumatic nail gun according to claim 1, characterized in that: The cylinder is connected to the bottom cover via threads.

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