Fire-fighting smoke gun convenient to fold and store

Abstract

The utility model discloses a fire-fighting smoke gun convenient to fold and store, which comprises a smoke generator and a control rod fixedly connected to the bottom of the smoke generator, a control button is arranged on the surface of the control rod, the bottom end of the control rod is connected with an extension tube, the inner wall of the extension tube is slidably connected with a telescopic tube, and a locking strip is fixedly connected in the extension tube. A locking strip is arranged on the telescopic pipe, a plurality of first locking teeth are fixedly connected to the side face of the locking strip, a locking block is arranged on the telescopic pipe, second locking teeth are fixedly connected to the side face of the locking block, the first locking teeth and the second locking teeth are in a right-angle triangular block shape, and the first locking teeth and the second locking teeth are matched to lock the telescopic pipe in a one-way mode. According to the utility model, the extension length of the telescopic tube can be adjusted during use through the arrangement of the slidable telescopic tube so as to adapt to detectors at different height positions, the telescopic tube can be locked through the arrangement of the first locking teeth and the second locking teeth, the telescopic tube is prevented from retracting into the extension tube, extra electric drive is not needed, and the cost is reduced.

Description

Technical Field

[0001] This application relates to the field of fire smoke gun technology, and in particular to a fire smoke gun that is easy to fold and store. Background Technology

[0002] Smoke detectors are common alarm devices in daily life. When the smoke concentration around the detector reaches a certain level, it triggers the alarm, allowing for the early detection of potential fires. To ensure more accurate and effective fire detection, smoke detectors need to be inspected regularly, and damaged detectors should be removed and replaced with new ones. Currently, a common method is to place a fire extinguisher nozzle below the smoke detector, allowing the smoke from the nozzle to diffuse into the detector, thus checking for any malfunctions.

[0003] A search revealed that Chinese Patent CN221889087U discloses a fire smoke gun that is easy to fold and store. It pressurizes the inside of the pressurizing pipe by setting up a pressurizing pump and a liquid injection pipe; and transmits hydraulic medium through the liquid injection hole to adjust the position of the sliding rod and the sliding cylinder, thereby adjusting the position of the fire smoke gun. However, this device uses multiple liquid pumps for pressurization, which requires additional electricity to drive the liquid pumps, resulting in high costs. Therefore, a fire smoke gun that is easy to fold and store is proposed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a fire smoke gun that is easy to fold and store, so as to solve the problems mentioned in the background art.

[0005] The embodiments of this application adopt the following technical solutions:

[0006] A fire smoke gun that is easy to fold and store includes a smoke generator and a control rod fixedly connected to the bottom of the smoke generator. The control rod has a control button on its surface. An extension tube is connected to the bottom end of the control rod. A telescopic tube is slidably connected to the inner wall of the extension tube. A locking strip is fixedly connected inside the extension tube. Multiple first locking teeth are fixedly connected to the side of the locking strip. A locking block is provided on the telescopic tube. A second locking tooth is fixedly connected to the side of the locking block. Both the first and second locking teeth are right-angled triangular blocks. The first and second locking teeth cooperate to lock the telescopic tube in one direction.

[0007] Preferably, the inner wall of the extension tube extends radially inward to form a limiting strip, and the surface of the telescopic tube is formed with a limiting groove adapted to the limiting strip. The limiting strip and the limiting groove are slidably connected, and the telescopic tube is slidably connected to the extension tube through the limiting strip and the limiting groove.

[0008] Preferably, the locking strip is fixedly connected to the end of the limiting strip in the extension direction, the locking block is disposed inside the limiting groove, and the horizontal outer wall of the first locking tooth is located below the inclined outer wall to cooperate with the second locking tooth to restrict the telescopic tube from retracting into the extension tube.

[0009] Preferably, the inner wall of the limiting groove is provided with a sliding hole, and a sliding rod is slidably connected to the inner wall of the sliding hole. One end of the sliding rod is fixedly connected to the locking block. A first spring is sleeved on the surface of the sliding rod. One end of the first spring is fixedly connected to the locking block, and the other end of the first spring is fixedly connected to the inner wall of the limiting groove. The end of the sliding rod away from the locking block is connected to a transmission structure for driving the two locking blocks to move closer to each other. A handle is fixedly connected to the bottom end of the telescopic tube. The bottom of the transmission structure extends into the handle and is fixedly connected to a movable block. A sliding groove is provided on the surface of the handle, and the movable block is slidably connected to the sliding groove.

[0010] Preferably, the transmission structure is a lever transmission mechanism, which includes a lever body fixedly connected to the end of the slide rod. The bottom end of the lever body extends into the handle and is fixedly connected to the movable block. The bottom end of the telescopic tube and the top end of the handle are both provided with clearance openings to facilitate the movement of the lever body. The movable block slides longitudinally in the slide groove.

[0011] Preferably, the transmission structure is a pull rod transmission mechanism, which includes a pull rod body. A force-receiving deflector is fixedly connected to the top end of the pull rod body, and both ends of the force-receiving deflector are respectively connected to the ends of two slide rods. A sliding opening is provided at the bottom end of the telescopic tube and the top end of the handle. The pull rod body is slidably connected to the sliding opening. The bottom end of the pull rod body passes through the sliding opening and is fixedly connected to a movable block. The movable block moves vertically in the sliding groove. When the pull rod body moves downward in the vertical direction, the force-receiving deflector causes the slide rod to be subjected to a horizontal pulling force toward the axis of the telescopic tube.

[0012] Preferably, the force-receiving deflector is a multi-joint connector, which includes a fixing block fixedly connected to the top end of the pull rod body, and connecting rods rotatably connected to both ends of the fixing block. The end of the connecting rod away from the fixing block is rotatably connected to the end of the slide rod.

[0013] Preferably, the force-receiving and direction-changing component is a pull rope, with both ends of the pull rope fixedly connected to the ends of the two slide rods, and the pull rod body fixedly connected to the middle of the pull rope.

[0014] Preferably, the control rod and the extension tube have two symmetrical folded pieces arranged radially on their surfaces. The folded pieces are rotatably connected to the surfaces of the control rod and the extension tube via a rotating shaft. A sleeve is slidably connected to the surface of the extension tube, and a guide rail is formed on the surface of the extension tube. A guide groove is formed on the inner wall of the sleeve, and the guide rail is slidably connected to the guide groove. A limiting protrusion is fixedly connected to the surface of the control rod, and the limiting protrusion is adapted to the guide groove. A bottom ring is fixedly connected to the bottom end of the guide rail, and a second spring is fixedly connected to the upper surface of the bottom ring. The top end of the second spring is fixedly connected to the bottom end of the sleeve.

[0015] The above-described technical solutions adopted in the embodiments of this application can achieve the following beneficial effects:

[0016] In this invention, a sliding telescopic tube is provided, allowing for adjustment of its extension length during use to accommodate detectors at different heights. The telescopic tube can also be easily stored inside the extended tube. By providing a first and a second locking tooth, the telescopic tube can be locked to prevent it from retracting into the extended tube. The first locking block and the second locking tooth work together to lock the telescopic tube in only one direction, allowing the user to easily pull the tube outwards for quick adjustment of its extension length. Compared to the prior art which uses a liquid pump, this invention eliminates the need for additional electrical power, reducing costs. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 Here is a three-dimensional structural schematic diagram of this utility model;

[0019] Figure 2 Here is a three-dimensional structural diagram of the extended tube and telescopic tube of this utility model;

[0020] Figure 3 See: A cross-sectional view of the extended tube and telescopic tube of this utility model;

[0021] Figure 4 See: A cross-sectional view of the telescopic tube according to Embodiment 1 of this utility model;

[0022] Figure 5 Example 1 of this utility model Figure 4 Enlarged structural diagram at point A;

[0023] Figure 6 Example 1 of this utility model Figure 4 Enlarged structural diagram at point B;

[0024] Figure 7 See: A cross-sectional view of the telescopic tube in Embodiment 2 of this utility model;

[0025] Figure 8 Example 2 of this utility model Figure 7 Enlarged structural diagram at point C;

[0026] Figure 9 This utility model is: Figure 7 Enlarged three-dimensional structural diagram of the movable block at point D (Examples 2 and 3);

[0027] Figure 10 Here is a cross-sectional view of the telescopic tube in Embodiment 3 of this utility model;

[0028] Figure 11 Here is a cross-sectional view of the sleeve of this utility model;

[0029] Figure 12 See: A front view structural diagram of the present invention in its retracted and folded state.

[0030] In the diagram: 1. Smoke generator; 2. Control lever; 3. Button; 4. Extension tube; 5. Telescopic tube; 6. Locking bar; 7. First locking tooth; 8. Locking block; 9. Second locking tooth; 10. Limiting bar; 11. Limiting groove; 12. Slide rod; 13. First spring; 14. Handle; 15. Pull rope; 16. Movable block; 17. Slide groove; 18. Lever body; 19. Clearance opening; 20. Pull rod body; 21. Sliding opening; 22. Fixing block; 23. Connecting rod; 24. Folding piece; 25. Sleeve; 26. Guide rail; 27. Guide groove; 28. Limiting protrusion; 29. ​​Bottom ring; 30. Second spring. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0033] Please see Figure 1-12 This utility model provides a technical solution for a fire smoke gun that is easy to fold and store:

[0034] A fire smoke gun that is easy to fold and store includes a smoke generator 1 and a control rod 2 fixedly connected to the bottom of the smoke generator 1. The control rod 2 is provided with a control button 3. The bottom end of the control rod 2 is connected to an extension tube 4. A telescopic tube 5 is slidably connected to the inner wall of the extension tube 4. A locking strip 6 is fixedly connected inside the extension tube 4. Multiple first locking teeth 7 are fixedly connected to the side of the locking strip 6. A locking block 8 is provided on the telescopic tube 5. A second locking tooth 9 is fixedly connected to the side of the locking block 8. Both the first locking teeth 7 and the second locking teeth 9 are right-angled triangular blocks. The first locking teeth 7 and the second locking teeth 9 cooperate to lock the telescopic tube 5 in one direction.

[0035] Specifically, by setting a sliding telescopic tube 5, the extension length of the telescopic tube 5 can be adjusted during use to adapt to detectors at different heights. At the same time, the telescopic tube 5 can be retracted into the paper extension tube 4 for convenient storage. By setting a first locking tooth 7 and a second locking tooth 9, the telescopic tube 5 can be locked to prevent it from retracting into the extension tube 4. The first locking block and the second locking tooth 9 work together to lock the telescopic tube 5 in one direction only, which makes it easy for users to pull the telescopic tube 5 outward to quickly adjust the extension length of the telescopic tube 5. Compared with the use of a liquid pump in the prior art, no additional power is required, reducing its cost.

[0036] Two symmetrical folding pieces 24 are radially arranged on the surfaces of the control lever 2 and the extension tube 4. The folding pieces 24 are rotatably connected to the surfaces of the control lever 2 and the extension tube 4 via a rotating shaft. A sleeve 25 is slidably connected to the surface of the extension tube 4. A guide rail 26 is formed on the surface of the extension tube 4. A guide groove 27 is opened on the inner wall of the sleeve 25. The guide rail 26 is slidably connected to the guide groove 27. A limit protrusion 28 is fixedly connected to the surface of the control lever 2. The limit protrusion 28 is adapted to the guide groove 27. A bottom ring 29 is fixedly connected to the bottom end of the guide rail 26. A second spring 30 is fixedly connected to the upper surface of the bottom ring 29. The top of the second spring 30... The end is fixedly connected to the bottom end of the sleeve 25. By setting the folding piece 24, the control rod 2 and the extension tube 4 can be folded to reduce the overall length of the fire smoke gun for easy storage. By setting the sleeve 25 to cooperate with the limiting protrusion 28, the unfolded control rod 2 and the extension are positioned. The second spring 30 keeps the sleeve 25 in a limiting position on the limiting protrusion 28 to keep the control rod 2 stable. When storage is required, pull down the sleeve 25 and then use the folding piece 24 to rotate the control rod 2 so that the control rod 2 and the extension tube 4 are folded. After releasing the spring, the sleeve 25 rests on the folding piece 24 to store the fire smoke gun.

[0037] The inner wall of the extension tube 4 extends radially inward to form a limiting strip 10. The surface of the telescopic tube 5 is formed with a limiting groove 11 that matches the limiting strip 10. The limiting strip 10 and the limiting groove 11 are slidably connected. The telescopic tube 5 is slidably connected to the extension tube 4 through the limiting strip 10 and the limiting groove 11. By setting the limiting strip 10 and the limiting groove 11, the sliding between the telescopic tube 5 and the extension tube 4 is realized.

[0038] The locking strip 6 is fixedly connected to the end of the limiting strip 10 in the extension direction. The locking block 8 is set inside the limiting groove 11. The horizontal outer wall of the first locking tooth 7 is located below the inclined outer wall to cooperate with the second locking tooth 9 to restrict the telescopic tube 5 from retracting into the extension tube 4.

[0039] The inner wall of the limiting groove 11 has a sliding hole, and a sliding rod 12 is slidably connected to the inner wall of the sliding hole. One end of the sliding rod 12 is fixedly connected to the locking block 8. A first spring 13 is sleeved on the surface of the sliding rod 12. One end of the first spring 13 is fixedly connected to the locking block 8, and the other end of the first spring 13 is fixedly connected to the inner wall of the limiting groove 11. The end of the sliding rod 12 away from the locking block 8 is connected to a transmission structure for driving the two locking blocks 8 to move closer to each other. A handle 14 is fixedly connected to the bottom end of the telescopic tube 5. The bottom of the transmission structure extends into the handle 14 and is fixedly connected to a movable block 16. A sliding groove 17 is opened on the surface of the handle 14, and the movable block 16 is fixedly connected to the handle 14. The moving block 16 is slidably connected to the slide groove 17. By setting the first spring 13, the first locking tooth 7 and the second locking tooth 9 are kept in a meshed state under normal conditions. In this state, the telescopic tube 5 can only be pulled outward, but cannot be retracted into the extension tube 4. The handle 14 is set to facilitate the user's holding. The movable block 16 is set to facilitate the user's operation of the movable block 16 when holding the handle 14. With the cooperation of the transmission structure, the slide rod 12 is driven to move, so that the two locking blocks 8 move away from each other, thereby separating the second locking tooth 9 from the first locking tooth 7. In this state, the telescopic tube 5 can be retracted into the extension tube 4.

[0040] Example 1

[0041] like Figures 4-6 As shown, the transmission structure is a lever transmission mechanism, which includes a lever body 18 fixedly connected to the end of the slide bar 12. The bottom end of the lever body 18 extends into the handle 14 and is fixedly connected to the movable block 16. The bottom end of the telescopic tube 5 and the top end of the handle 14 are both provided with clearance openings 19 to facilitate the movement of the lever body 18. The movable block 16 slides longitudinally in the slide groove 17. When in use, with the handle in hand, the fingers press the two movable blocks 16, causing the two movable blocks 16 to move towards the axis of the handle 14. The movable blocks 16 drive the lever body 18 to move, the lever body 18 drives the slide bar 12 to move, the sliding drives the locking block 8 to move, and the locking block 8 drives the second locking tooth 9 to move, so that the second locking tooth 9 separates from the first locking tooth 7.

[0042] Example 2

[0043] like Figures 7-9 As shown, the transmission structure is a pull rod transmission mechanism, which includes a pull rod body 20. A force-receiving deflector is fixedly connected to the top of the pull rod body 20, and the two ends of the force-receiving deflector are respectively connected to the ends of two slide rods 12. The bottom end of the telescopic tube 5 and the top end of the handle 14 are both provided with sliding openings 21. The pull rod body 20 is slidably connected to the sliding openings 21. The bottom end of the pull rod body 20 passes through the sliding openings 21 and is fixedly connected to the movable block 16. The movable block 16 moves vertically in the sliding groove 17. When the force-receiving deflector moves the pull rod body 20 downward in the vertical direction, the slide rod 12 is subjected to a horizontal pulling force toward the axis of the telescopic tube 5. In use, when holding the handle 14, the thumb moves one of the movable blocks 16 downward. The movable block 16 drives the pull rod body 20 to move, and the pull rod body 20 drives the force-receiving deflector to move. The force-receiving deflector causes the end of the slide rod 12 to be subjected to a horizontal pulling force toward the axis of the telescopic tube 5, so that the two slide rods 12 move closer to each other.

[0044] The force-reducing component is a multi-joint connector, which includes a fixed block 22 fixedly connected to the top of the pull rod body 20. Both ends of the fixed block 22 are rotatably connected to connecting rods 23. The end of the connecting rod 23 away from the fixed block 22 is rotatably connected to the end of the slide rod 12. In use, when holding the handle 14, the thumb moves one of the movable blocks 16 downwards. The movable block 16 drives the pull rod body 20 to move, the pull rod body 20 drives the fixed block 22 to move, the fixed block 22 drives the two connecting rods 23 to move, and the two connecting rods 23 drive the two slide rods 12 to move closer to each other.

[0045] Example 3

[0046] like Figure 9 , Figure 10 As shown, the transmission structure is a pull rod transmission mechanism, which includes a pull rod body 20. A force-receiving deflector is fixedly connected to the top of the pull rod body 20, and the two ends of the force-receiving deflector are respectively connected to the ends of two slide rods 12. The bottom end of the telescopic tube 5 and the top end of the handle 14 are both provided with sliding openings 21. The pull rod body 20 is slidably connected to the sliding openings 21. The bottom end of the pull rod body 20 passes through the sliding openings 21 and is fixedly connected to the movable block 16. The movable block 16 moves vertically in the sliding groove 17. When the force-receiving deflector moves the pull rod body 20 downward in the vertical direction, the slide rod 12 is subjected to a horizontal pulling force toward the axis of the telescopic tube 5. In use, when holding the handle 14, the thumb moves one of the movable blocks 16 downward. The movable block 16 drives the pull rod body 20 to move, and the pull rod body 20 drives the force-receiving deflector to move. The force-receiving deflector causes the end of the slide rod 12 to be subjected to a horizontal pulling force toward the axis of the telescopic tube 5, so that the two slide rods 12 move closer to each other.

[0047] The force-receiving and direction-changing component is a pull rope 15. The two ends of the pull rope 15 are fixedly connected to the ends of the two slide rods 12, respectively. The pull rod body 20 is fixedly connected to the middle of the pull rope 15. When the handle 14 is held, the thumb moves one of the movable blocks 16 downwards. The movable block 16 drives the pull rod body 20 to move. The pull rod body 20 drives the middle of the pull rope 15 to move, which in turn drives the two ends of the pull rope 15 to move, so that the pull rope 15 drives the two slide rods 12 closer to each other. In other embodiments, there are two pull ropes 15. One end of the pull rope 15 is fixedly connected to the end of the slide rod 12, and the other end of the pull rope 15 is fixedly connected to the pull rod body 20, so that when the pull rod body 20 moves downwards, it drives the two slide rods 12 closer to each other.

[0048] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0049] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A fire smoke gun that is easy to fold and store, comprising a smoke generator (1) and a control rod (2) fixedly connected to the bottom of the smoke generator (1), wherein a control button (3) is provided on the surface of the control rod (2), characterized in that: The bottom end of the control rod (2) is connected to an extension tube (4), and the inner wall of the extension tube (4) is slidably connected to a telescopic tube (5). A locking strip (6) is fixedly connected inside the extension tube (4), and multiple first locking teeth (7) are fixedly connected to the side of the locking strip (6). A locking block (8) is provided on the telescopic tube (5), and a second locking tooth (9) is fixedly connected to the side of the locking block (8). The first locking tooth (7) and the second locking tooth (9) are both right-angled triangular blocks. The first locking tooth (7) and the second locking tooth (9) cooperate to lock the telescopic tube (5) in one direction.

2. A fire smoke gun that is easy to fold and store according to claim 1, characterized in that: The inner wall of the extended tube (4) extends radially inward to form a limiting strip (10), and the surface of the telescopic tube (5) is formed with a limiting groove (11) that is adapted to the limiting strip (10). The limiting strip (10) and the limiting groove (11) are slidably connected, and the telescopic tube (5) is slidably connected to the extended tube (4) through the limiting strip (10) and the limiting groove (11).

3. A fire smoke gun that is easy to fold and store according to claim 2, characterized in that: The locking strip (6) is fixedly connected to the end of the extension direction of the limiting strip (10), the locking block (8) is set inside the limiting groove (11), and the horizontal outer wall of the first locking tooth (7) is located below the inclined outer wall to cooperate with the second locking tooth (9) to restrict the telescopic tube (5) from retracting into the extension tube (4).

4. A fire smoke gun that is easy to fold and store according to claim 3, characterized in that: The inner wall of the limiting groove (11) is provided with a sliding hole, and a sliding rod (12) is slidably connected to the inner wall of the sliding hole. One end of the sliding rod (12) is fixedly connected to the locking block (8). A first spring (13) is sleeved on the surface of the sliding rod (12). One end of the first spring (13) is fixedly connected to the locking block (8), and the other end of the first spring (13) is fixedly connected to the inner wall of the limiting groove (11). The end of the sliding rod (12) away from the locking block (8) is connected to a transmission structure for driving the two locking blocks (8) to approach each other. The bottom end of the telescopic tube (5) is fixedly connected to a handle (14). The bottom of the transmission structure extends into the handle (14) and is fixedly connected to a movable block (16). The surface of the handle (14) is provided with a sliding groove (17), and the movable block (16) is slidably connected to the sliding groove (17).

5. A fire smoke gun that is easy to fold and store according to claim 4, characterized in that: The transmission structure is a lever transmission mechanism, which includes a lever body (18) fixedly connected to the end of the slide bar (12). The bottom end of the lever body (18) extends into the handle (14) and is fixedly connected to the movable block (16). The bottom end of the telescopic tube (5) and the top end of the handle (14) are both provided with clearance openings (19) to facilitate the movement of the lever body (18). The movable block (16) slides longitudinally in the slide groove (17).

6. A fire smoke gun that is easy to fold and store according to claim 4, characterized in that: The transmission structure is a pull rod transmission mechanism, which includes a pull rod body (20). The top end of the pull rod body (20) is fixedly connected to a force-receiving deflector, and the two ends of the force-receiving deflector are respectively connected to the ends of two slide rods (12). The bottom end of the telescopic tube (5) and the top end of the handle (14) are both provided with sliding ports (21). The pull rod body (20) is slidably connected to the sliding ports (21). The bottom end of the pull rod body (20) passes through the sliding ports (21) and is fixedly connected to the movable block (16). The movable block (16) moves vertically in the sliding groove (17). When the force-receiving deflector moves downward in the vertical direction, the slide rod (12) is subjected to a horizontal pulling force toward the axis of the telescopic tube (5).

7. A fire smoke gun that is easy to fold and store according to claim 6, characterized in that: The force-receiving deflector is a multi-joint connector, which includes a fixing block (22) fixedly connected to the top of the pull rod body (20). Both ends of the fixing block (22) are rotatably connected to a connecting rod (23). The end of the connecting rod (23) away from the fixing block (22) is rotatably connected to the end of the slide rod (12).

8. A fire smoke gun that is easy to fold and store according to claim 6, characterized in that: The force-receiving and direction-changing component is a pull rope (15), the two ends of which are fixedly connected to the ends of the two slide rods (12) respectively, and the pull rod body (20) is fixedly connected to the middle part of the pull rope (15).

9. A fire smoke gun that is easy to fold and store according to claim 1, characterized in that: The control rod (2) and the extension tube (4) are provided with two symmetrical folding pieces (24) radially. The folding pieces (24) are rotatably connected to the control rod (2) and the extension tube (4) via a rotating shaft. The extension tube (4) is slidably connected to a sleeve (25). The extension tube (4) is formed with a guide rail (26). The inner wall of the sleeve (25) is provided with a guide groove (27). The guide rail (26) is slidably connected to the guide groove (27). The control rod (2) is fixedly connected to a limiting protrusion (28). The limiting protrusion (28) is adapted to the guide groove (27). The bottom end of the guide rail (26) is fixedly connected to a bottom ring (29). The upper surface of the bottom ring (29) is fixedly connected to a second spring (30). The top end of the second spring (30) is fixedly connected to the bottom end of the sleeve (25).

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