Self-drainage anti-leakage water pump

Abstract

The self-drainage anti-leakage water pump specifically comprises a water pump body, a water outlet pipe is fixedly installed at the upper end of the water pump body, a water inlet pipe is fixedly connected to the left side of the water pump body, and external water pipes are connected to the ends, away from the water pump body, of the water outlet pipe and the water inlet pipe through flanges; protective assemblies are movably mounted at the joints of the water outlet pipe and the water inlet pipe with the external water pipe, and clamping plates are arranged on the two sides of the joints of the water outlet pipe and the water inlet pipe with the external water pipe respectively. Through cooperation of the water pump body, the water outlet pipe, the water inlet pipe, the external water pipe, the protection assembly and the clamping plates, the clamping plates are installed on the two sides of the joint of the pipeline of the water pump body and the external pipeline correspondingly, and the clamping effect of the clamping plates on the two sides on the joint of the pipeline of the water pump body and the external pipeline is achieved; the tightness of the joint of the pipeline of the water pump body and the external pipeline is improved, and water leakage caused by looseness of bolts at the joint of the pipeline of the water pump body and the external pipeline is prevented.

Description

Technical Field

[0001] This invention relates to the field of water pumps, specifically a self-draining, leak-proof water pump. Background Technology

[0002] A self-priming water pump, also known as a self-draining pump or self-priming pump, is a type of water pump that can automatically expel air and establish a sufficient vacuum to draw liquid without requiring manual filling of the pump and suction pipe with water before starting (i.e., "priming" or "priming"). Before starting the pump, the pump casing is filled with water (or the pump casing itself contains water). After starting, the impeller rotates at high speed, causing the water in the impeller channel to flow towards the volute. At this time, a vacuum is formed at the inlet, causing the inlet check valve to open. Air in the suction pipe enters the pump and reaches the outer edge through the impeller channel. Through repeated circulation, the air in the suction pipe is gradually expelled, allowing water to enter the pump and completing the self-priming process.

[0003] However, existing self-draining water pumps require external pipes to provide a water flow channel in practical applications. The connection between the self-draining water pump and the external pipe is achieved via bolts. When the self-draining water pump starts, the water flow suddenly accelerates from a stationary state, violently impacting the pipe like a piston. Furthermore, when it stops, the flowing water rapidly reverses due to the sudden loss of power, generating a significant reverse impact force on the pipe and connection. This repeated impact of the water flow on the self-draining water pump and pipe causes vibration between them. This vibration can loosen the bolts connecting the self-draining water pump and the external pipe, leading to water leakage at the connection point. This not only wastes water resources but also affects the normal water delivery function of the self-draining water pump. Summary of the Invention

[0004] This application proposes a self-draining, leak-proof water pump, which has the following advantages: it strengthens the tightness of the connection between the pump pipe and the external pipe, prevents the bolts at the pipe connection from loosening, and maintains the sealing effect at the connection of the pump pipe, thus solving the technical problems mentioned in the background art.

[0005] To achieve the above objectives, this application adopts the following technical solution: a self-draining, leak-proof water pump, comprising a pump body, an outlet pipe fixedly installed at the upper end of the pump body, an inlet pipe fixedly connected to the left side of the pump body, and an external water pipe flanged at the ends of the outlet pipe and the inlet pipe away from the pump body. Protective components are movably installed at the connections of the outlet pipe, the inlet pipe, and the external water pipe. Clamping plates are respectively provided on both sides of the connections of the outlet pipe, the inlet pipe, and the external water pipe. A fixing block is movably engaged at the upper end of each clamping plate. The fixing block is detachably connected to the clamping plate via a spring clip. A round rod is fixedly installed at the upper end of the fixing block. A cylindrical tube is movably sleeved on the outer wall of the round rod. An active component for controlling the position of the clamping plates is provided on the inner side of the inner end of the round rod.

[0006] Preferably, a sealing ring is movably installed at the connection between the water outlet pipe and an external water pipe and at the connection between the water inlet pipe and another external water pipe. Several rubber pillars are evenly distributed on one side of the sealing ring. Several connecting bolts are threadedly connected at the connection between the water outlet pipe and an external water pipe and at the connection between the water inlet pipe and another external water pipe.

[0007] Preferably, the protective assembly includes an upper housing, a lower housing, and fastening bolts, wherein the front and rear ends of the upper housing and the lower housing are respectively threaded to the outer wall of the fastening bolts.

[0008] Preferably, a rubber pad is fixedly installed on the inner side of the clamping plate, and a locking block is fixedly connected to the outer side of the clamping plate. The inner wall of the locking block is movably engaged with the outer wall of the fixing block, and the fixing block is detachably connected to the locking block by a spring clip.

[0009] Preferably, a baffle located outside the locking block is fixedly installed on the outer side of the fixing block, a vertical rod is fixedly connected to the outer side of the baffle, a disc is fixedly installed at the end of the vertical rod away from the baffle, and one side of the disc is fixedly connected to the outer end of the rod. A plurality of sliders are evenly distributed on the outer wall of the inner end of the rod, and the end of the slider away from the rod is slidably connected to the inner wall of the cylindrical tube.

[0010] Preferably, the movable component includes a ball nut and a ball screw. The outer side of the ball nut is fixedly connected to the inner wall of the round rod. The inner wall of the ball nut is movably connected to the outer wall of the ball screw via balls. A rotating component is provided at the inner end of the ball screw. A rotating shaft is fixedly installed at the outer end of the rotating component. A knob is fixedly connected to the outer end of the rotating shaft. A limiting component located inside the knob is provided on the outer wall of the rotating shaft.

[0011] Preferably, the rotating assembly includes a first bevel gear and a second bevel gear, wherein the inner side of the first bevel gear and the second bevel gear are connected by an meshing manner, and the outer side of the first bevel gear is fixedly connected to a ball screw.

[0012] Preferably, the upper end of the second bevel gear is fixedly connected to the lower end of the rotating shaft, and a support rod is rotatably connected to the lower end of the second bevel gear. A housing located outside the rotating assembly is fixedly installed at the lower end of the support rod, and the housing is fixedly connected to the protective assembly. The housing is installed below the limiting assembly.

[0013] Preferably, the limiting component includes a limiting gear and a limiting block, the limiting block being engaged between two adjacent teeth of the limiting gear, and the inner wall of the limiting gear being fixedly sleeved with the outer wall of the rotating shaft.

[0014] Preferably, a telescopic rod is fixedly installed on the outer side of the limiting block, a movable block is fixedly connected to the end of the telescopic rod away from the limiting block, a spring is fixedly installed on the outer side of the movable block, a sleeve rod located outside the movable block and the spring is movably sleeved on the outer wall of the telescopic rod, and the inner side of the sleeve rod is fixedly connected to the outer shell, the end of the spring away from the movable block is fixedly connected to the inner wall of the sleeve rod, a magnetic block is fixedly installed on the upper end of the sleeve rod, an iron block is magnetically attracted to the upper end of the magnetic block, and the inner side of the iron block is fixedly connected to the outer side of the movable block.

[0015] The present invention has the following beneficial effects:

[0016] 1. This invention utilizes the cooperation between the water pump body, outlet pipe, inlet pipe, external water pipe, protective components, and clamps. By installing clamps on both sides of the connection between the water pump body's pipe and the external pipe, the clamps on both sides achieve a clamping effect on the connection between the water pump body's pipe and the external pipe, increasing the tightness of the connection between the water pump body's pipe and the external pipe, and preventing water leakage caused by loose bolts at the connection between the water pump body's pipe and the external pipe.

[0017] 2. This invention achieves the adjustment of the position of the clamping plate inside the protective component by coordinating the pump body, clamping plate, rotating component, and movable component, and by using the rotating component and movable component to move the clamping plate within the protective component. This allows the clamping plates on both sides to be used at the connection points between the pump body and the external pipe with different thicknesses, thereby improving the flexibility of the clamping plate in practical applications.

[0018] 3. This invention achieves the connection between the pump body, rubber pad, clamping plate, spring clip, and fixing block through the cooperation between the pump body, rubber pad, clamping plate, spring clip, and fixing block. By changing the connection method between the spring clip and the clamping plate, it is easy to replace the worn rubber pad, thereby maintaining the clamping effect of the clamping plate on the connection between the pump body pipe and the external pipe. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the rubber column in the structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of the protective component in the structure of the present invention;

[0022] Figure 4 This is a schematic diagram of the connecting bolts in the structure of the present invention;

[0023] Figure 5 This is a schematic diagram of the rubber pad in the structure of the present invention;

[0024] Figure 6 This is a schematic diagram of the clamping plate in the structure of the present invention;

[0025] Figure 7 This is a schematic diagram of the internal structure of the circular rod in the structure of the present invention;

[0026] Figure 8 In the structure of this invention Figure 7 A magnified view of point A;

[0027] Figure 9 This is a schematic diagram of the cylindrical tube in the structure of the present invention;

[0028] Figure 10 In the structure of this invention Figure 9 A magnified view of point B;

[0029] Figure 11 This is a schematic diagram of the internal structure of the sleeve rod in the structure of the present invention;

[0030] Figure 12 This is a schematic diagram of the internal structure of the spring in the structure of the present invention.

[0031] In the diagram: 1. Pump body; 2. Outlet pipe; 3. Inlet pipe; 4. External water pipe; 5. Protective components; 501. Upper housing; 502. Lower housing; 503. Fastening bolts; 6. Clamping plate; 7. Fixing block; 8. Spring clip; 10. Round rod; 11. Cylindrical cylinder; 12. Movable component; 121. Ball nut; 122. Ball screw; 13. Sealing ring; 14. Rubber column; 15. Connecting bolts; 16. Rubber pad; 7. Engaging block; 18. Baffle; 19. Vertical rod; 20. Disc; 21. Slider; 22. Rotating assembly; 221. First bevel gear; 222. Second bevel gear; 23. Rotating shaft; 24. Limiting assembly; 241. Limiting gear; 242. Limiting block; 25. Knob; 26. Support rod; 27. Housing; 28. Telescopic rod; 29. ​​Moving block; 30. Spring; 31. Sleeve rod; 32. Magnetic block; 33. Iron block. Detailed Implementation

[0032] The technical solution of the present invention will be clearly and completely described below with reference to preferred embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] like Figure 1 , Figure 4 and Figure 5 A self-draining, leak-proof water pump includes a pump body 1. A water outlet pipe 2 is fixedly installed on the upper end of the pump body 1. A water inlet pipe 3 is fixedly connected to the left side of the pump body 1. An external water pipe 4 is flanged to the ends of the water outlet pipe 2 and the water inlet pipe 3 away from the pump body 1. Protective components 5 are movably installed at the connection points of the water outlet pipe 2 and the water inlet pipe 3 with the external water pipe 4. Clamping plates 6 are respectively provided on both sides of the connection points of the water outlet pipe 2 and the water inlet pipe 3 with the external water pipe 4. A fixing block 7 is movably snapped onto the upper end of the clamping plate 6. The fixing block 7 is detachably connected to the clamping plate 6 through a spring clip 8. A round rod 10 is fixedly installed on the upper end of the fixing block 7. A cylindrical tube 11 is movably sleeved on the outer wall of the round rod 10. A movable component 12 for controlling the position of the clamping plate 6 is provided on the inner side of the inner end of the round rod 10.

[0034] A sealing ring 13 is movably installed at the connection between the water outlet pipe 2 and an external water pipe 4, and at the connection between the water inlet pipe 3 and another external water pipe 4. Several rubber pillars 14 are evenly distributed on one side of the sealing ring 13. Several connecting bolts 15 are threadedly connected at the connection between the water outlet pipe 2 and an external water pipe 4, and at the connection between the water inlet pipe 3 and another external water pipe 4.

[0035] The protective component 5 includes an upper housing 501, a lower housing 502, and a fastening bolt 503. The fastening bolt 503 connects the upper housing 501 and the lower housing 502. The front and rear ends of the upper housing 501 and the lower housing 502 are respectively threaded to the outer wall of the fastening bolt 503.

[0036] like Figure 2 , Figure 8 and Figure 12 A rubber pad 16 is fixedly installed on the inner side of the clamping plate 6, and a locking block 17 is fixedly connected to the outer side of the clamping plate 6. The inner wall of the locking block 17 is movably locked with the outer wall of the fixing block 7. The fixing block 7 is detachably connected to the locking block 17 through a spring clip 8. Since the clamping force of the clamping plate 6 is judged by the deformation of the rubber pad 16, when the clamping plate 6 is damaged, the clamping plate 6 can be removed from the fixing block 7 by separating the spring clip 8 that connects the locking block 17 and the fixing block 7, so as to replace the worn rubber pad 16.

[0037] A baffle 18 located outside the locking block 17 is fixedly installed on the outside of the fixing block 7. A vertical rod 19 is fixedly connected to the outside of the baffle 18. A disc 20 is fixedly installed at the end of the vertical rod 19 away from the baffle 18. One side of the disc 20 is fixedly connected to the outer end of the round rod 10. Several sliders 21 are evenly distributed on the outer wall of the inner end of the round rod 10. The end of the slider 21 away from the round rod 10 is slidably connected to the inner wall of the cylindrical tube 11. The sliders 21 restrict the movement path of the round rod 10 in the cylindrical tube 11.

[0038] The movable component 12 includes a ball nut 121 and a ball screw 122. The outer side of the ball nut 121 is fixedly connected to the inner wall of the round rod 10. The inner wall of the ball nut 121 is movably connected to the outer wall of the ball screw 122 through balls. A rotating component 22 is provided at the inner end of the ball screw 122. A rotating shaft 23 is fixedly installed at the outer end of the rotating component 22. A knob 25 is fixedly connected to the outer end of the rotating shaft 23. A limiting component 24 located inside the knob 25 is provided on the outer wall of the rotating shaft 23.

[0039] like Figure 3 , Figure 7 and Figure 9 The rotating assembly 22 includes a first bevel gear 221 and a second bevel gear 222. The inner side of the first bevel gear 221 and the second bevel gear 222 are connected by meshing. The outer side of the first bevel gear 221 is fixedly connected to the ball screw 122.

[0040] The upper end of the second bevel gear 222 is fixedly connected to the lower end of the rotating shaft 23. As the rotating shaft 23 rotates, it drives the second bevel gear 222 to rotate on the support rod 26. Since two first bevel gears 221 mesh with the left and right sides of the second bevel gear 222 respectively, the rotation of the second bevel gear 222 drives the rotation of the first bevel gears 221. The rotation of the first bevel gears 221 on both sides drives the rotation of the ball screw 122. Because the ball screw 122 and the ball nut 121 are connected by balls, the circumferential rotation of the ball screw 122 drives the horizontal movement of the ball nut 121. The movement of the ball nut 121, in turn, drives the horizontal movement of the ball screw 122. The connection of the round rod 10, the disc 20, the vertical rod 19, the baffle 18, the fixing block 7, the spring clip 8, and the locking block 17 drives the clamping plate 6 to move towards the connection between the water inlet pipe 3 and the external water pipe 4, until the rubber pad 16 is moved to the connection between the water inlet pipe 3 and the external water pipe 4, until the contact surface between the rubber pad 16 and the connection between the water inlet pipe 3 and the external water pipe 4 generates a certain resistance, then the knob 25 can be stopped from rotating. The lower end of the second bevel gear 222 is rotatably connected to the support rod 26, and the lower end of the support rod 26 is fixedly installed with the outer shell 27 located outside the rotating component 22, and the outer shell 27 is fixedly connected to the protective component 5. The outer shell 27 is installed below the limiting component 24.

[0041] like Figure 6 , Figure 10 and Figure 11 The limiting component 24 includes a limiting gear 241 and a limiting block 242. The limiting block 242 is engaged between two adjacent teeth of the limiting gear 241, and the inner wall of the limiting gear 241 is fixedly sleeved with the outer wall of the rotating shaft 23.

[0042] A telescopic rod 28 is fixedly installed on the outer side of the limiting block 242. A movable block 29 is fixedly connected to the end of the telescopic rod 28 away from the limiting block 242. A spring 30 is fixedly installed on the outer side of the movable block 29. A sleeve rod 31 located outside the movable block 29 and the spring 30 is movably sleeved on the outer wall of the telescopic rod 28. The inner side of the sleeve rod 31 is fixedly connected to the outer shell 27. The end of the spring 30 away from the movable block 29 is fixedly connected to the inner wall of the sleeve rod 31. A magnetic block 32 is fixedly installed on the upper end of the sleeve rod 31. An iron block 33 is magnetically attracted to the upper end of the magnetic block 32. The inner side of the iron block 33 is fixedly connected to the outer side of the movable block 29. When the iron block 33 is pulled, it magnetically attracts the magnetic block 32. At this time, the movement of the iron block 33 drives the telescopic rod 28 to move into the sleeve rod 31 through the connection of the movable block 29. The spring 30 is compressed, and the limiting block 242 is separated from the limiting gear 241. The rotation of the knob 25 drives the rotation of the rotating shaft 23.

[0043] Working principle: In use, firstly, several connecting bolts 15 are used to connect the inlet pipe 3 to an external water pipe 4. At this time, the sealing ring 13 is installed between the inlet pipe 3 and the external water pipe 4, and the rubber column 14 is inserted into the inside of the inlet pipe 3. The setting of the sealing ring 13 increases the sealing effect at the connection between the inlet pipe 3 and the external water pipe 4. Then, the upper housing 501 is installed at the upper end of the connection between the inlet pipe 3 and the external water pipe 4, and the lower housing 502 is installed at the lower end of the connection between the inlet pipe 3 and the external water pipe 4. The lower housing 502 is used to connect the upper housing 501 and the fastening bolts 503, and the iron block 33 and the magnetic block 32 are pulled. Magnetic attraction occurs, at which point the movement of iron block 33, through the connection of moving block 29, drives telescopic rod 28 to move into sleeve rod 31. Spring 30 is compressed, and limiting block 242 separates from limiting gear 241. Rotation of knob 25 drives rotation of shaft 23. Simultaneously, rotation of shaft 23 drives rotation of second bevel gear 222 on support rod 26. Since two first bevel gears 221 mesh with each other on the left and right sides of second bevel gear 222, rotation of second bevel gear 222 drives rotation of first bevel gear 221. The rotation of first bevel gears 221 on the left and right sides drives ball screw 122. As the ball screw 122 rotates, it drives the ball nut 121 to move horizontally. Simultaneously, the ball screw 122's circumferential rotation, connected to the ball nut 121 via balls, causes the ball nut 121 to move horizontally. This movement, through the connection of the round rod 10, disc 20, vertical rod 19, baffle 18, fixing block 7, spring clip 8, and locking block 17, moves the clamping plate 6 towards the connection point between the inlet pipe 3 and the external water pipe 4. This continues until the rubber pad 16 is moved to the connection point, and once a certain resistance is generated at the contact surface between the rubber pad 16 and the connection point, the knob 25 can be turned off. Rotate, then separate the iron block 33 and the magnetic block 32. Utilize the spring 30's rebound to engage the limiting block 242 with two adjacent teeth, thus achieving the fastening effect of the protective component 5 on the connection between the inlet pipe 3 and the external water pipe 4. Then, following the above steps, install another set of protective components 5 at the connection between the outlet pipe 2 and another external water pipe 4. Finally, based on the judgment of the clamping force of the clamping plate 6 by the deformation of the rubber pad 16, when the clamping plate 6 is damaged, the spring clip 8 connecting the connecting block 17 and the fixing block 7 can be separated to remove the clamping plate 6 from the fixing block 7, thereby replacing the worn rubber pad 16.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention. The invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A self-draining, leak-proof water pump, comprising a pump body (1), characterized in that: A water outlet pipe (2) is fixedly installed at the upper end of the water pump body (1), and a water inlet pipe (3) is fixedly connected to the left side of the water pump body (1). Both the water outlet pipe (2) and the water inlet pipe (3) have flanged connections to external water pipes (4) at their ends away from the water pump body (1). Protective components (5) are movably installed at the connections between the water outlet pipe (2), the water inlet pipe (3), and the external water pipe (4). A clamping plate (6) is provided on both sides of the connection. A fixing block (7) is movably engaged at the upper end of the clamping plate (6). The fixing block (7) is detachably connected to the clamping plate (6) through a spring clip (8). A round rod (10) is fixedly installed at the upper end of the fixing block (7). A cylindrical tube (11) is movably sleeved on the outer wall of the round rod (10). An active component (12) for controlling the position of the clamping plate (6) is provided on the inner side of the inner end of the round rod (10).

2. The self-draining, leak-proof water pump according to claim 1, characterized in that: A sealing ring (13) is movably installed at the connection between the water outlet pipe (2) and an external water pipe (4) and at the connection between the water inlet pipe (3) and another external water pipe (4). Several rubber pillars (14) are evenly distributed on one side of the sealing ring (13). Several connecting bolts (15) are threadedly connected at the connection between the water outlet pipe (2) and an external water pipe (4) and at the connection between the water inlet pipe (3) and another external water pipe (4).

3. The self-draining, leak-proof water pump according to claim 1, characterized in that: The protective component (5) includes an upper housing (501), a lower housing (502), and a fastening bolt (503). The front and rear ends of the upper housing (501) and the lower housing (502) are respectively threaded to the outer wall of the fastening bolt (503).

4. The self-draining, leak-proof water pump according to claim 1, characterized in that: A rubber pad (16) is fixedly installed on the inner side of the clamping plate (6), and a locking block (17) is fixedly connected to the outer side of the clamping plate (6). The inner wall of the locking block (17) is movably locked with the outer wall of the fixing block (7). The fixing block (7) is detachably connected to the locking block (17) through a spring clip (8).

5. A self-draining, leak-proof water pump according to claim 4, characterized in that: A baffle (18) located outside the locking block (17) is fixedly installed on the outside of the fixing block (7). A vertical rod (19) is fixedly connected to the outside of the baffle (18). A disc (20) is fixedly installed at the end of the vertical rod (19) away from the baffle (18). One side of the disc (20) is fixedly connected to the outer end of the round rod (10). A number of sliders (21) are evenly distributed on the outer wall of the inner end of the round rod (10). The end of the slider (21) away from the round rod (10) is slidably connected to the inner wall of the cylindrical tube (11).

6. A self-draining, leak-proof water pump according to claim 1, characterized in that: The movable component (12) includes a ball nut (121) and a ball screw (122). The outer side of the ball nut (121) is fixedly connected to the inner wall of the round rod (10). The inner wall of the ball nut (121) is movably connected to the outer wall of the ball screw (122) through balls. A rotating component (22) is provided at the inner end of the ball screw (122). A rotating shaft (23) is fixedly installed at the outer end of the rotating component (22). A knob (25) is fixedly connected at the outer end of the rotating shaft (23). A limiting component (24) located inside the knob (25) is provided on the outer wall of the rotating shaft (23).

7. A self-draining, leak-proof water pump according to claim 6, characterized in that: The rotating assembly (22) includes a first bevel gear (221) and a second bevel gear (222). The inner side of the first bevel gear (221) and the second bevel gear (222) are connected by meshing. The outer side of the first bevel gear (221) is fixedly connected to the ball screw (122).

8. A self-draining, leak-proof water pump according to claim 7, characterized in that: The upper end of the second bevel gear (222) is fixedly connected to the lower end of the rotating shaft (23). The lower end of the second bevel gear (222) is rotatably connected to a support rod (26). The lower end of the support rod (26) is fixedly installed with a housing (27) located outside the rotating assembly (22). The housing (27) is fixedly connected to the protective assembly (5). The housing (27) is installed below the limiting assembly (24).

9. A self-draining, leak-proof water pump according to claim 8, characterized in that: The limiting component (24) includes a limiting gear (241) and a limiting block (242). The limiting block (242) is engaged between two adjacent teeth of the limiting gear (241). The inner wall of the limiting gear (241) is fixedly sleeved with the outer wall of the rotating shaft (23).

10. A self-draining, leak-proof water pump according to claim 9, characterized in that: A telescopic rod (28) is fixedly installed on the outer side of the limiting block (242). A movable block (29) is fixedly connected to the end of the telescopic rod (28) away from the limiting block (242). A spring (30) is fixedly installed on the outer side of the movable block (29). A sleeve rod (31) located outside the movable block (29) and the spring (30) is movably sleeved on the outer wall of the telescopic rod (28). The inner side of the sleeve rod (31) is fixedly connected to the outer shell (27). The end of the spring (30) away from the movable block (29) is fixedly connected to the inner wall of the sleeve rod (31). A magnetic block (32) is fixedly installed on the upper end of the sleeve rod (31). An iron block (33) is magnetically attracted to the upper end of the magnetic block (32). The inner side of the iron block (33) is fixedly connected to the outer side of the movable block (29).

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