Manual labor-saving glue gun

Abstract

The utility model relates to a manual labor-saving glue gun, which belongs to the technical field of glue guns and comprises a glue solution tank, an inflator component, a partition plate, a spring and a glue outlet pipe, a glue solution bag is mounted in the glue solution tank, an air inlet is arranged at the bottom end of the glue solution tank, a glue outlet is arranged at the top end of the glue solution tank and communicated with the inside of the glue solution bag, and a limit cylinder is clamped at the glue outlet; the top end of the inflator assembly is detachably connected to the bottom end of the glue solution tank, and an air outlet in the top end of the inflator assembly communicates with an air inlet of the glue solution tank; the partition plate is clamped between the top end of the inflator assembly and the bottom end of the glue solution tank and is provided with a vent hole communicated with the air outlet hole and the air inlet hole, and an elastic one-way valve plate is fixed to the inner side wall of the vent hole and covers the air outlet hole; the spring is telescopically connected in the limiting cylinder; the bottom end of the glue outlet pipe is pressed against the top end of the spring. According to the utility model, compressed air is exhausted through the air outlet hole, can elastically eject open the one-way valve plate and is introduced into the glue solution tank, so that a glue solution bag in the glue solution tank is extruded and compressed.

Description

Technical Field

[0001] The utility model relates to the technical field of glue guns, in particular to a manual labor-saving glue gun. Background Art

[0002] With the continuous improvement of living standards and aesthetic awareness, in interior decoration, more and more people will use glue products such as adhesives, grout sealants, and bonding adhesives to fill the gaps in interior decoration and beautify the interior space.

[0003] At present, glue products are mainly applied by using a glue gun. The traditional glue gun mainly consists of a tank body, a sealing cover plate, a pressing pump, and a discharge pipe. The inside of the tank body is filled with glue and its top surface is provided with an opening; the sealing cover plate is hermetically fixed at the opening of the tank body and a through hole is provided in the middle thereof; the pressing pump is inserted and fixed at the through hole and the discharge port at its top passes through the through hole; the discharge pipe is fixedly connected to the discharge port at the top of the pressing pump; the glue gun nozzle is detachably connected to the discharge pipe; in actual use, by reciprocally pressing the glue gun nozzle, the discharge pipe will be driven to reciprocally press the pressing pump. At this time, the pressing pump will extract the glue filled in the tank body and spray it out through the glue gun nozzle to complete the glue application work. However, the above glue gun requires the operator to repeatedly press the pressing pump to eject glue normally, resulting in too high labor intensity and being not conducive to the long-term glue application by the operator.

[0004] To solve the above problems, a number of automatic pressure glue guns have been introduced in the market. The principle is to add a pressure tank on the basis of the traditional glue gun and use the compressed air stored in the pressure tank to extrude the glue inside the tank body, so as to reduce the labor intensity of the operator and improve the convenience of glue application. However, due to the fact that the pressure tank is not easy to transport and cannot be stored for a long time, the promotion scope of the automatic pressure glue gun is limited and it is not conducive to large-area promotion and application.

[0005] Therefore, how to design a manual glue gun that is both labor-saving and safe is an urgent problem to be solved by those skilled in the art. Summary of the Utility Model

[0006] The utility model provides a manual labor-saving glue gun, which solves the technical problems that the existing labor-saving glue guns are inconvenient to transport, not easy to store, and prone to explosion.

[0007] The technical solution for the utility model to solve the above technical problems is as follows. A manual labor-saving glue gun includes: a glue tank, a pump assembly, a partition board, a spring, and a glue outlet pipe.

[0008] Inside the glue tank, a glue bag is installed, and an air inlet hole is provided at its bottom end. An outlet hole is provided at the top end of the glue tank, and the outlet hole communicates with the inside of the glue bag. A limiting cylinder is clamped at the outlet hole, and an annular limiting portion is fixed on the inner side wall of the limiting cylinder; the top end of the air pump assembly is detachably connected to the bottom end of the glue tank, and the air outlet hole at its top end communicates with the air inlet hole of the glue tank; the partition is clamped between the top end of the air pump assembly and the bottom end of the glue tank and is provided with a ventilation hole communicating with the air outlet hole and the air inlet hole. An elastic one-way valve plate is fixed on the inner side wall of the ventilation hole, and the one-way valve plate covers the air outlet hole. The compressed gas flowing out of the air outlet hole can elastically push open the one-way valve plate; the spring is placed inside the limiting cylinder, and its bottom end abuts against the annular limiting portion; the bottom end of the glue outlet pipe is a closed end, and the closed end presses against the top end of the spring. The side wall of the glue outlet pipe is provided with a glue passing hole, and the glue passing hole can extend into the glue tank as the glue outlet pipe squeezes the spring.

[0009] The beneficial effects of the present utility model are as follows: First, use the air pump assembly to output compressed gas. After the compressed gas is discharged from the air outlet hole, it will elastically push open the one-way valve plate and enter the glue tank to squeeze the glue bag inside the compressed glue tank; then use the glue outlet pipe to squeeze the compressed spring to make the glue passing hole communicate with the inside of the glue bag, thus omitting the traditional glue discharging action of repeatedly squeezing the glue outlet pipe, reducing the labor intensity of the operator, and improving the uniformity and continuity of the glue discharging of the glue outlet pipe.

[0010] On the basis of the above technical solution, the present utility model can be further improved as follows.

[0011] Further, the glue tank includes a tank body, an end cover, an upper connection cylinder and a lower connection cylinder. An opening is provided at the top end of the tank body; the end cover is placed at the opening at the top end of the tank body, and a through hole is provided in the middle thereof; the upper connection cylinder is located outside the tank body and is fixed and communicated with the through hole of the end cover; the lower connection cylinder is placed inside the tank body and is fixed and communicated with the through hole of the end cover; the bag mouth of the glue bag is fixed and communicated with the lower connection cylinder; the air inlet hole is provided at the bottom end of the tank body; the outlet hole is the inner hole of the upper connection cylinder; the air pump assembly is detachably connected to the bottom end of the tank body; the partition is clamped between the top end of the air pump assembly and the bottom end of the tank body.

[0012] Further, the glue tank further includes a locking sleeve. The outer side wall of the tank body near its top end is provided with a thread; the inner wall of the locking sleeve is provided with an internal thread and is threadedly connected to the thread at the top end of the tank body. A pressing ring is fixed at the inner top end of the locking sleeve, and the pressing ring presses against the end cover.

[0013] The further beneficial effects are as follows: By using the pressing ring on the locking sleeve to press against the end cover, the stability of the placement of the end cover can be improved, and the shaking or movement of the end cover can be avoided.

[0014] Furthermore, it further includes a glue gun nozzle, and the glue gun nozzle includes a connecting sleeve, a discharge end cover, a discharge conical tube, a fixed base ring and a pressing frame plate. The outer part of the upper connecting cylinder is provided with an external thread; the inner wall of the connecting sleeve is provided with an internal thread and is threadedly connected to the external thread of the upper connecting cylinder. A sealing ring is fixed on the inner top wall of the connecting sleeve; the discharge end cover is placed above the connecting sleeve and a material passing hole is provided in the middle thereof; the large-diameter end of the discharge conical tube is fixed and communicated with the material passing hole at the top end of the discharge end cover; the top end of the glue outlet tube sequentially passes through the sealing ring and the material passing hole and extends into the discharge conical tube; the fixed base ring is fixed on the connecting sleeve corresponding to the outer peripheral side of the discharge end cover, and a vertical plate is vertically fixed on one side of the top surface thereof; the pressing frame plate is sleeved on the outer peripheral side of the discharge conical tube, and one end thereof is hinged to the top end of the vertical plate. A pressing block is fixed on the pressing frame plate corresponding to the upper part of the discharge end cover, and the pressing block can press the discharge end cover as the pressing frame plate rotates.

[0015] The further beneficial effects are as follows: By using the lever principle, the pressing frame plate is sleeved on the outer peripheral side of the discharge conical tube and one end thereof is hinged to the vertical plate. Since a pressing block is fixed on the pressing frame plate corresponding to the upper part of the discharge end cover, when the other end of the pressing frame plate is pressed, the pressing force of the glue gun can be reduced, the labor intensity of the operator can be reduced, and the convenience and safety of using the glue gun can be improved.

[0016] Furthermore, the air pump assembly includes an outer cylinder, an inner cylinder, a sliding rod and a handle. A hollow stud is fixedly connected to the tank body corresponding to its air inlet hole; the top end of the outer cylinder is fixedly connected with a screw sleeve, and the screw sleeve is threadedly connected to the hollow stud; a partition plate is placed in the screw sleeve, and both end faces thereof are in contact with the bottom end of the hollow stud and the top end of the outer cylinder respectively; the inner cylinder is fixedly arranged in the outer cylinder and the top end thereof is a closed end; the air outlet hole is arranged at the closed end of the inner cylinder; the sliding rod is slidably connected in the inner cylinder; the handle is fixed to the bottom end of the sliding rod extending out of the inner cylinder.

[0017] The further beneficial effects are as follows: By using the sliding rod to slide in the inner cylinder, the gas inside the inner cylinder can be extruded from the air outlet hole.

[0018] Further, the air pump assembly further includes a connecting rod, a one-way air guide plate, and a sealing ring. The connecting rod is located inside the inner cylinder, and its bottom end is fixed to the top end of the sliding rod. The one-way air guide plate is located inside the inner cylinder, and its plate surface is vertically fixed to the top end of the connecting rod. The one-way air guide plate is provided with air guide holes. The sealing ring is sleeved on the connecting rod, and its outer ring contacts the inner wall of the inner cylinder. The diameter of the sealing ring is smaller than the length of the connecting rod, so that after the sealing ring contacts the one-way air guide plate, the outside air can be introduced into the inner cylinder through the air guide holes.

[0019] The further beneficial effects of the above are as follows: First, push the sliding rod upward. The sealing ring contacts the top end of the sliding rod and the inner wall of the inner cylinder, which can isolate the inner cylinder from the outside world, and then it is convenient to discharge the gas in the inner cylinder from the air outlet. Subsequently, pull the sliding rod back downward. The sealing ring disengages from the top end of the sliding rod and contacts the one-way air guide plate. At this time, the inside of the inner cylinder communicates with the outside through the air guide holes, the gap between the sealing ring and the connecting rod, the gap between the sealing ring and the top end of the sliding rod, and the gap between the outer side wall of the sliding rod and the inner wall of the inner cylinder, and the outside air can be introduced into the inner cylinder.

[0020] Further, the annular limiting portion includes a guiding ring and a limiting ring. The guiding ring is fixed to the inner side wall of the limiting cylinder. The limiting ring is fixed to the inner side wall of the guiding ring. The spring is placed inside the guiding ring, and its bottom end abuts against the limiting ring.

[0021] The further beneficial effects of the above are as follows: First, place the spring inside the guiding ring, which can prevent the spring from shaking and changing its position. Description of the Drawings

[0022] Figure 1 is a three-dimensional structural schematic diagram of a manual labor-saving glue gun of the present invention;

[0023] Figure 2 is an internal structural schematic diagram of a manual labor-saving glue gun of the present invention;

[0024] Figure 3 is Figure 2 a partial enlarged structural schematic diagram at A;

[0025] Figure 4 is Figure 2 a partial enlarged structural schematic diagram at B;

[0026] Figure 5 is Figure 2 a partial enlarged structural schematic diagram at C.

[0027] In the drawings, the list of components represented by each reference numeral is as follows:

[0028] 1. Glue liquid tank, 11. Tank body, 12. End cover, 13. Upper connecting cylinder, 14. Lower connecting cylinder, 15. Locking sleeve, 16. Hollow stud, 2. Air pump assembly, 21. Outer cylinder, 22. Inner cylinder, 23. Slide bar, 24. Handle, 25. Nut sleeve, 26. Connecting rod, 27. One-way air guide plate, 271. Air guide hole, 28. Sealing ring, 3. Partition board, 31. Vent hole, 32. One-way valve plate, 4. Spring, 5. Glue outlet pipe, 51. Glue through hole, 6. Glue liquid bag, 7. Limit cylinder, 71. Guide ring, 72. Limit ring, 8. Glue gun nozzle, 81. Connecting sleeve, 82. Discharge end cover, 83. Discharge conical pipe, 84. Fixed base ring, 85. Pressing frame plate, 86. Vertical plate, 87. Pressing block. Detailed implementation manners

[0029] The principles and features of the present utility model will be described below in conjunction with the accompanying drawings. The examples given are only used to explain the present utility model and are not intended to limit the scope of the present utility model.

[0030] As Figure 1 shown, a manual labor-saving glue gun includes: a glue liquid tank 1, an air pump assembly 2, a partition board 3, a spring 4 and a glue outlet pipe 5. A glue liquid bag 6 is installed inside the glue liquid tank 1 and an air inlet hole is provided at its bottom end. An glue outlet hole is provided at the top end of the glue liquid tank 1 and the glue outlet hole communicates with the inside of the glue liquid bag 6. A limit cylinder 7 is clamped at the glue outlet hole and an annular limiting portion is fixed on the inner side wall of the limit cylinder 7. The top end of the air pump assembly 2 is detachably connected to the bottom end of the glue liquid tank 1 and the air outlet hole at its top end communicates with the air inlet hole of the glue liquid tank 1. The partition board 3 is clamped between the top end of the air pump assembly 2 and the bottom end of the glue liquid tank 1 and is provided with a vent hole 31 communicating with the air outlet hole and the air inlet hole. An elastic one-way valve plate 32 is fixed on the inner side wall of the vent hole 31 and the one-way valve plate 32 covers the air outlet hole. The compressed gas flowing out of the air outlet hole can elastically push open the one-way valve plate 32. The spring 4 is placed inside the limit cylinder 7 and its bottom end abuts against the annular limiting portion. The bottom end of the glue outlet pipe 5 is a closed end and the closed end presses against the top end of the spring 4. The side wall of the glue outlet pipe 5 is provided with a glue through hole 51 and the glue through hole 51 can extend into the glue liquid tank 1 as the glue outlet pipe 5 presses the spring 4.

[0031] In some specific embodiments, the glue liquid tank 1 may include a tank body 11, an end cover 12, an upper connecting cylinder 13 and a lower connecting cylinder 14. An opening is provided at the top end of the tank body 11. The end cover 12 is placed at the opening at the top end of the tank body 11 and a through hole is provided in the middle thereof. The upper connecting cylinder 13 is located outside the tank body 11 and is fixed and communicated with the through hole of the end cover 12. The lower connecting cylinder 14 is placed inside the tank body 11 and is fixed and communicated with the through hole of the end cover 12. The mouth of the glue liquid bag 6 is fixed and communicated with the lower connecting cylinder 14. The air inlet hole is provided at the bottom end of the tank body 11. The glue outlet hole is the inner hole of the upper connecting cylinder 13. The air pump assembly 2 is detachably connected to the bottom end of the tank body 11. The partition board 3 is clamped between the top end of the air pump assembly 2 and the bottom end of the tank body 11.

[0032] In some specific embodiments, the glue tank 1 may further include a locking sleeve 15. The outer wall of the tank body 11 near its top end is provided with a thread; the inner wall of the locking sleeve 15 is provided with an internal thread and is threadedly connected to the thread at the top end of the tank body 11. A pressing ring is fixed to the inner top end of the locking sleeve 15 and the pressing ring presses against the end cover 12.

[0033] In some specific embodiments, a glue gun nozzle 8 may further be included. The glue gun nozzle 8 includes a connecting sleeve 81, a discharge end cover 82, a discharge tapered tube 83, a fixed base ring 84, and a pressing frame plate 85. The outer part of the upper connecting tube 13 is provided with an external thread; the inner wall of the connecting sleeve 81 is provided with an internal thread and is threadedly connected to the external thread of the upper connecting tube 13. A sealing ring is fixed to the inner top wall of the connecting sleeve 81; the discharge end cover 82 is placed above the connecting sleeve 81 and a material passing hole is provided in the middle thereof; the large-diameter end of the discharge tapered tube 83 is fixed and communicated with the material passing hole at the top end of the discharge end cover 82; the top end of the glue outlet tube 5 sequentially passes through the sealing ring and the material passing hole and extends into the discharge tapered tube 83; the fixed base ring 84 is fixed to the connecting sleeve 81 corresponding to the outer peripheral side of the discharge end cover 82 and a vertical plate 86 is vertically fixed to one side of the top surface thereof; the pressing frame plate 85 is sleeved on the outer peripheral side of the discharge tapered tube 83 and one end thereof is hinged to the top end of the vertical plate 86. A pressing block 87 is fixed to the pressing frame plate 85 corresponding to the upper part of the discharge end cover 82 and the pressing block 87 can press the discharge end cover 82 as the pressing frame plate 85 rotates.

[0034] In some specific embodiments, the air pump assembly 2 may include an outer cylinder 21, an inner cylinder 22, a sliding rod 23, and a handle 24. The tank body 11 is fixedly and communicatively connected with a hollow stud 16 corresponding to its air inlet hole; the top end of the outer cylinder 21 is fixedly and communicatively connected with a screw sleeve 25, and the screw sleeve 25 is threadedly connected to the hollow stud 16; a partition plate 3 is placed in the screw sleeve 25 and its two end faces are respectively in contact with the bottom end of the hollow stud 16 and the top end of the outer cylinder 21; the inner cylinder 22 is fixedly penetrated in the outer cylinder 21 and its top end is a closed end; an air outlet hole is provided in the closed end of the inner cylinder 22; the sliding rod 23 is slidably connected in the inner cylinder 22; the handle 24 is fixed to the bottom end of the sliding rod 23 extending out of the inner cylinder 22.

[0035] In some specific embodiments, the air pump assembly 2 may further include a connecting rod 26, a one-way air guiding plate 27, and a sealing ring 28. The connecting rod 26 is located in the inner cylinder 22 and its bottom end is fixed to the top end of the sliding rod 23; the one-way air guiding plate 27 is located in the inner cylinder 22 and its plate surface is vertically fixed to the top end of the connecting rod 26. An air guiding hole 271 is provided in the one-way air guiding plate 27; the sealing ring 28 is sleeved on the connecting rod 26 and its outer ring is in contact with the inner wall of the inner cylinder 22. The diameter of the sealing ring 28 is smaller than the length of the connecting rod 26, so as to introduce the outside air into the inner cylinder 22 through the air guiding hole 271 after the sealing ring 28 contacts the one-way air guiding plate 27.

[0036] In some specific embodiments, the annular limiting portion may include a guiding ring 71 and a limiting ring 72. The guiding ring 71 is fixed on the inner side wall of the limiting cylinder 7; the limiting ring 72 is fixed on the inner side wall of the guiding ring 71; the spring 4 is placed inside the guiding ring 71 and its bottom end abuts against the limiting ring 72.

[0037] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A manual labor-saving glue gun, characterized in that, Comprising: A glue solution tank (1), inside which a glue solution bag (6) is installed and an air inlet hole is provided at its bottom end. An outlet glue hole is provided at the top end of the glue solution tank (1), and the outlet glue hole is communicated with the inside of the glue solution bag (6). A limiting cylinder (7) is clamped at the outlet glue hole, and an annular limiting portion is fixed on the inner side wall of the limiting cylinder (7); A pump assembly (2), the top end of which is detachably connected to the bottom end of the glue solution tank (1), and the air outlet hole at its top end is communicated with the air inlet hole of the glue solution tank (1); A partition plate (3), which is clamped between the top end of the pump assembly (2) and the bottom end of the glue solution tank (1) and is provided with a ventilation hole (31) communicating with the air outlet hole and the air inlet hole. An elastic one-way valve plate (32) is fixed on the inner side wall of the ventilation hole (31), and the one-way valve plate (32) covers the air outlet hole. The compressed gas flowing out of the air outlet hole can elastically push open the one-way valve plate (32); A spring (4) and a glue outlet pipe (5), the spring (4) is placed inside the limiting cylinder (7) and its bottom end abuts against the annular limiting portion; the bottom end of the glue outlet pipe (5) is a closed end and its closed end presses against the top end of the spring (4). The side wall of the glue outlet pipe (5) is provided with a glue through hole (51), and the glue through hole (51) can extend into the glue solution tank (1) as the glue outlet pipe (5) squeezes the spring (4).

2. The manual labor-saving glue gun according to claim 1, wherein The glue solution tank (1) includes a tank body (11), an end cover (12), an upper connecting cylinder (13) and a lower connecting cylinder (14). An opening is provided at the top end of the tank body (11); the end cover (12) is placed at the opening at the top end of the tank body (11) and a through hole is provided in the middle thereof; the upper connecting cylinder (13) is located outside the tank body (11) and is fixed and communicated with the through hole of the end cover (12); the lower connecting cylinder (14) is placed inside the tank body (11) and is fixed and communicated with the through hole of the end cover (12); the bag mouth of the glue solution bag (6) is fixed and communicated with the lower connecting cylinder (14); the air inlet hole is provided at the bottom end of the tank body (11); the outlet glue hole is the inner hole of the upper connecting cylinder (13); the pump assembly (2) is detachably connected to the bottom end of the tank body (11); the partition plate (3) is clamped between the top end of the pump assembly (2) and the bottom end of the tank body (11).

3. The manual labor-saving glue gun according to claim 2, wherein The glue solution tank (1) further includes a locking sleeve (15). The outer side wall of the tank body (11) near its top end is provided with a thread; the inner wall of the locking sleeve (15) is provided with an internal thread and is threadedly connected to the thread at the top end of the tank body (11). A pressing ring is fixed at the inner top end of the locking sleeve (15), and the pressing ring presses against the end cover (12).

4. The manual labor-saving glue gun according to claim 3, wherein It further includes a glue gun nozzle (8), and the glue gun nozzle (8) includes a connecting sleeve (81), a discharge end cover (82), a discharge conical tube (83), a fixed base ring (84) and a pressing frame plate (85). The outer part of the upper connecting cylinder (13) is provided with an external thread; the inner wall of the connecting sleeve (81) is provided with an internal thread and is threadedly connected to the external thread of the upper connecting cylinder (13). A sealing ring is fixed to the inner top wall of the connecting sleeve (81); the discharge end cover (82) is placed above the connecting sleeve (81) and a material passing hole is provided in the middle thereof; the large-diameter end of the discharge conical tube (83) is fixed and communicated with the material passing hole at the top end of the discharge end cover (82); the top end of the glue outlet tube (5) sequentially passes through the sealing ring and the material passing hole and extends into the discharge conical tube (83); the fixed base ring (84) is fixed to the connecting sleeve (81) corresponding to the outer peripheral side of the discharge end cover (82), and a vertical plate (86) is vertically fixed to one side of the top surface thereof; the pressing frame plate (85) is sleeved on the outer peripheral side of the discharge conical tube (83), and one end thereof is hinged to the top end of the vertical plate (86). A pressing block (87) is fixed to the pressing frame plate (85) corresponding to the upper part of the discharge end cover (82), and the pressing block (87) can press the discharge end cover (82) as the pressing frame plate (85) rotates.

5. The manual labor-saving glue gun according to claim 2, wherein, The air pump assembly (2) includes an outer cylinder (21), an inner cylinder (22), a sliding rod (23) and a handle (24). A hollow stud (16) is fixedly connected to the tank body (11) corresponding to its air inlet hole; the top end of the outer cylinder (21) is fixedly connected with a screw sleeve (25), and the screw sleeve (25) is threadedly connected to the hollow stud (16); a partition plate (3) is placed in the screw sleeve (25), and both end faces thereof are in contact with the bottom end of the hollow stud (16) and the top end of the outer cylinder (21) respectively; the inner cylinder (22) is fixedly penetrated in the outer cylinder (21), and the top end thereof is a closed end; the air outlet hole is provided at the closed end of the inner cylinder (22); the sliding rod (23) is slidably connected in the inner cylinder (22); the handle (24) is fixed to the bottom end of the sliding rod (23) extending out of the inner cylinder (22).

6. The manual labor-saving glue gun according to claim 5, characterized in that, The air pump assembly (2) further includes a connecting rod (26), a one-way air guide plate (27) and a sealing ring (28). The connecting rod (26) is located in the inner cylinder (22), and the bottom end thereof is fixed to the top end of the sliding rod (23); the one-way air guide plate (27) is located in the inner cylinder (22), and the plate surface thereof is vertically fixed to the top end of the connecting rod (26). A guide air hole (271) is provided on the one-way air guide plate (27); the sealing ring (28) is sleeved on the connecting rod (26), and the outer ring thereof is in contact with the inner wall of the inner cylinder (22). The diameter of the sealing ring (28) is smaller than the length of the connecting rod (26), so as to introduce the outside air into the inner cylinder (22) through the guide air hole (271) after the sealing ring (28) contacts the one-way air guide plate (27).

7. A manual labor-saving glue gun according to claim 1, characterized in that, The annular limiting portion includes a guiding ring (71) and a limiting ring (72). The guiding ring (71) is fixed on the inner side wall of the limiting cylinder (7); the limiting ring (72) is fixed on the inner side wall of the guiding ring (71); the spring (4) is placed inside the guiding ring (71) and its bottom end abuts against the limiting ring (72).

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