Stable lifting equipment for electric power facility installation

Abstract

The invention relates to the technical field of electric power facility installation, in particular to stable lifting equipment for electric power facility installation, which comprises a base, a lifting mechanism is installed on the base, the lifting mechanism comprises a rotating shaft rotating on the base, a gear is fixed on the rotating shaft, one side of the gear is meshed with a rack, and the rack is meshed with the lifting mechanism. A rack is arranged in the buffer cylinder, a limiting cylinder is arranged on the outer side of the rack in a sleeving mode, and one side of the rack penetrates through the limiting cylinder to be connected with a lifting table. And along with the increase of the amount of gas in the buffer cylinder, the gas pressure overcomes the elastic force of the first spring, so that the buffer plate is pushed to move to extrude the lifting table, buffering is carried out when equipment on the lifting table descends, and meanwhile, the equipment on the lifting table is protected when the device suddenly descends accidentally.

Description

Technical Field

[0001] This invention relates to the field of power facility installation technology, specifically to a stable lifting device for power facility installation. Background Technology

[0002] Electrical equipment refers to various devices used to produce, transmit, distribute, and use electrical energy. Different electrical equipment has different functions and uses. Power generation equipment includes generators, wind turbines, solar panels, etc. These devices can convert mechanical energy or other forms of energy into electrical energy. Power transmission equipment transmits electrical energy from power plants to users through high-voltage transmission lines, substations, transformers, and other transfer equipment.

[0003] Existing power facility installation lifting equipment may malfunction during use if an accident occurs. Summary of the Invention

[0004] The purpose of this invention is to provide a stable lifting device for power facility installation, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a stable lifting device for power facility installation, comprising a base on which a lifting mechanism is mounted; The lifting mechanism includes a rotating shaft that rotates on a base, a gear fixed on the rotating shaft, a rack meshing with one side of the gear, a limiting cylinder sleeved on the outside of the rack, a lifting platform connected to one side of the rack through the limiting cylinder, and a protective mechanism provided on the rack. The protective mechanism includes a windmill rotating on a rack, a sealing plate movable inside the windmill, an air extraction plate movable at the bottom of the sealing plate, an air intake pipe connected to one end of the sealing plate, a first exhaust pipe connected to one side of the air intake pipe on the sealing plate, a buffer cylinder connected to one end of the first exhaust pipe, a buffer plate movable inside the buffer cylinder, an air inflation cylinder connected to the other end of the first exhaust pipe, a ratchet movable on the base, a push rod movable on one side of the ratchet, a limiting sleeve provided on one side of the base, a second limiting block provided at one end of the push rod, the second limiting block movable inside the limiting sleeve, and a first limiting block fixed on one side of the ratchet.

[0006] Preferably, a fixed platform is fixed to one side of the base, and a motor is fixed on the fixed platform, with the output end of the motor connected to the rotating shaft.

[0007] Preferably, fixed posts are provided on both sides of the rotating shaft, the gear rotates inside the two sets of fixed posts on the rotating shaft, and one end of the fixed post is fixedly connected to the base.

[0008] Preferably, a limiting post is provided inside the rack, and the limiting post is fixedly connected to the base.

[0009] Preferably, the lifting platform is provided with a limiting groove, and a protective cover is inserted into the limiting groove.

[0010] Preferably, a reciprocating screw is fixed to the bottom of the sealing plate, an air extraction disc slides on the reciprocating screw, an L-shaped limiting sleeve is provided at the bottom of the impeller, the L-shaped limiting sleeve is inserted into the limiting post, a fixed shaft is connected to one side of the L-shaped limiting sleeve, and the fixed shaft is inserted into the reciprocating screw.

[0011] Preferably, the intake pipe is provided with a first one-way valve, the exhaust pipe is provided with a second one-way valve, and one end of the first exhaust pipe passes through a limiting cylinder and communicates with a buffer cylinder.

[0012] Preferably, a first spring is provided inside the buffer cylinder, one end of the first spring is connected to the inner wall of the buffer cylinder, one end of the first spring is connected to the buffer plate, and one end of the buffer plate is movably connected to the bottom of the lifting platform.

[0013] Preferably, one end of the first exhaust pipe is connected to a second exhaust pipe, one end of the second exhaust pipe is connected to an air cylinder, a pressure valve is provided inside the second exhaust pipe, an L-shaped fixing plate is provided on one side of the base, a squeezing column is provided inside the air cylinder, and one end of the squeezing column is connected to a ratchet.

[0014] Preferably, a second spring is sleeved on the outside of the push rod, one end of the second spring is connected to a ratchet, the other end of the second spring is fixedly connected to the base, one end of the push rod moves inside the limiting sleeve, the L-shaped fixing plate is fixedly connected to the first limiting block, one end of the push rod is connected to the second limiting block, and the second limiting block moves inside the limiting sleeve.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes wind power to rotate a fan wheel on a rack, drawing in external gas through an intake pipe and simultaneously expelling the drawn-in gas through a first exhaust pipe to inflate the buffer cylinder. As the amount of gas inside the buffer cylinder increases, the gas pressure overcomes the elastic force of the first spring, thereby pushing the buffer plate to move and compress the lifting platform. This provides cushioning when the equipment on the lifting platform descends, and also protects the equipment on the lifting platform in the event of an unexpected and sudden drop.

[0016] This invention addresses the issue of gas entering the inflation cylinder through the second exhaust pipe when a certain amount of gas is introduced into the buffer cylinder. When the gas pressure exceeds the threshold of the pressure valve inside the second exhaust pipe, the gas from the first exhaust pipe enters the inflation cylinder through the second exhaust pipe. Simultaneously, when the internal gas pressure of the inflation cylinder is high, the ratchet drives the push rod to move, compressing the second spring. This causes the ratchet to engage with the first limiting block on the L-shaped fixing plate, preventing the ratchet from rotating. Furthermore, when the wind force is consistently high, this locks the lifting operation, preventing strong winds from affecting the lifting work and thus compromising its safety. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is one of the structural schematic diagrams of the lifting mechanism of the present invention; Figure 3 This is one of the schematic diagrams of the protective mechanism of the present invention; Figure 4 This is a second schematic diagram of the lifting mechanism of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of section A in the middle; Figure 6 This is a second schematic diagram of the protective mechanism of the present invention.

[0018] In the diagram: 1. Base; 2. Lifting mechanism; 21. Fixed platform; 22. Motor; 23. Rotating shaft; 24. Gear; 25. Rack; 26. Lifting platform; 27. Limiting column; 28. Limiting groove; 29. ​​Protective cover; 210. Limiting cylinder; 3. Protective mechanism; 31. Wind wheel; 32. Sealing plate; 33. Reciprocating screw; 34. Intake pipe; 35. First exhaust pipe; 36. L-shaped limiting sleeve; 37. Buffer cylinder; 38. Buffer plate; 39. First spring; 310. Limiting sleeve; 311. Second exhaust pipe; 312. Inflation cylinder; 313. L-shaped fixed plate; 314. Ratchet; 315. Extrusion column; 316. First limiting block; 317. Push rod; 318. Second spring; 319. Fixed shaft; 320. Second limiting block; 321. Suction plate. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0020] Please see Figures 1 to 6The present invention provides a stable lifting device for power facility installation, including a base 1 and a lifting mechanism 2 installed on the base 1; The lifting mechanism 2 includes a rotating shaft 23 that rotates on the base 1. A gear 24 is fixed on the rotating shaft 23. A rack 25 meshes with one side of the gear 24. A limiting cylinder 210 is sleeved on the outside of the rack 25. A lifting platform 26 is connected to one side of the rack 25 through the limiting cylinder 210. A protection mechanism 3 is provided on the rack 25. The protective mechanism 3 includes a windmill 31 that rotates on a rack 25. A sealing plate 32 is movable inside the windmill 31. An air extraction plate 321 is movable at the bottom of the sealing plate 32. One end of the sealing plate 32 is connected to an air intake pipe 34. A first exhaust pipe 35 is connected to one side of the air intake pipe 34 on the sealing plate 32. A buffer cylinder 37 is connected to one end of the first exhaust pipe 35. A buffer plate 38 is movable inside the buffer cylinder 37. The other end of the first exhaust pipe 35 is connected to an air inlet cylinder 312. A ratchet 314 is movable on the base 1. A push rod 317 is movable on one side of the ratchet 314. A limiting sleeve 310 is provided on one side of the base 1. A second limiting block 320 is provided at one end of the push rod 317. The second limiting block 320 is movable inside the limiting sleeve 310. A first limiting block 316 is fixed on one side of the ratchet 314.

[0021] The electrical equipment to be lifted is placed on the lifting platform 26 through the opening on the protective cover 29. At the same time, the motor 22 is started. When the motor 22 rotates, it drives the gear 24 to rotate through the rotating shaft 23. The gear 24 meshes with the rack 25, causing the rack 25 to rise inside the limiting cylinder 210. When the rack 25 rises, it synchronously drives the lifting platform 26 to move, thereby lifting the electrical equipment placed on the lifting platform 26 to the required height for installation.

[0022] Simultaneously, when strong winds occur during lifting, the wind force drives the impeller 31 to rotate on the rack 25. The impeller 31 is movably connected to the sealing plate 32, thus preventing the sealing plate 32 from rotating when the impeller 31 rotates, ensuring normal operation of the device. Simultaneously, the rotation of the impeller 31 causes the L-shaped limiting sleeve 36 to rotate inside the rack 25, restricting the impeller 31. The rotation of the L-shaped limiting sleeve 36 also causes the fixed shaft 319 on one side to rotate. The rotation of the fixed shaft 319 causes the reciprocating screw 33 to rotate. The rotation of the reciprocating screw 33, through a ball nut assembly, causes the suction disc 321 to move along the thread on the reciprocating screw 33, thereby drawing air through the suction pipe 34. The system draws in external gas and simultaneously discharges it through the first exhaust pipe 35. Backflow of gas is prevented by the first one-way valve inside the intake pipe 34 and the second one-way valve inside the first exhaust pipe 35. Gas enters the buffer cylinder 37 through the first exhaust pipe 35, inflating it. As the amount of gas inside the buffer cylinder 37 increases, the gas pressure overcomes the elastic force of the first spring 39, thereby pushing the buffer plate 38 to move and compress the lifting platform 26. This provides cushioning when the equipment on the lifting platform 26 descends, and also protects the equipment on the lifting platform 26 in the event of an unexpected and sudden drop.

[0023] Simultaneously, when a certain amount of gas is filled into the buffer cylinder 37, and the gas pressure exceeds the threshold of the pressure valve inside the second exhaust pipe 311, the gas inside the first exhaust pipe 35 enters the inflation cylinder 312 through the second exhaust pipe 311, compressing the extrusion column 315 inside the inflation cylinder 312. This compresses the extrusion column 315, pushing it to move and thus moving the ratchet 314. When the ratchet 314 moves, it drives the push rod 317 and the second limiting block 320 to move inside the limiting sleeve 310. At the same time, when the rotating shaft 23 rotates, it passes through the limiting... The cylinder 210 drives the second limiting block 320 to rotate, which in turn drives the ratchet 314 to rotate synchronously. At the same time, when the air pressure inside the air cylinder 312 is high, the ratchet 314 drives the push rod 317 to move, and at the same time squeezes the second spring 318, so that the ratchet 314 moves and engages with the first limiting block 316 on the L-shaped fixed plate 313, thus preventing the ratchet 314 from rotating. When the wind force is continuously strong, it locks the lifting operation to avoid affecting the lifting operation when the wind force is strong, thereby affecting the safety of the lifting operation.

[0024] In an optional embodiment, a fixed platform 21 is fixed to one side of the base 1, and a motor 22 is fixed on the fixed platform 21. The output end of the motor 22 is connected to the rotating shaft 23.

[0025] It should be noted that the motor 22 is fixed by the fixed platform 21 to ensure that the motor 22 works normally and the motor 22 drives the rotating shaft 23 to rotate when it is started.

[0026] In an optional embodiment, fixed posts are provided on both sides of the rotating shaft 23, and the gear 24 rotates inside the two sets of fixed posts on the rotating shaft 23. One end of the fixed post is fixedly connected to the base 1.

[0027] It should be noted that the rotation of the shaft 23 drives the gear 24 to rotate, thereby driving the rack 25 to rise inside the limiting cylinder 210 through the meshing of the gear 24 and the rack 25. When the rack 25 rises, it simultaneously drives the lifting platform 26 to move.

[0028] In an optional embodiment, a limiting post 27 is provided inside the rack 25, and the limiting post 27 is fixedly connected to the base 1.

[0029] It should be noted that when the rack 25 moves, it generates relative displacement with the limiting post 27, which restricts the movement of the rack 25.

[0030] In an optional embodiment, a limiting groove 28 is provided on the lifting platform 26, and a protective cover 29 is inserted into the limiting groove 28.

[0031] It should be noted that the protective cover 29 is restricted by the limiting groove 28 to prevent it from falling off after lifting, and the protective cover 29 also protects the electrical facilities on the lifting platform 26.

[0032] In an optional embodiment, a reciprocating screw 33 is fixed to the bottom of the sealing plate 32, and an air extraction plate 321 slides on the reciprocating screw 33. An L-shaped limiting sleeve 36 is provided at the bottom of the impeller 31. The L-shaped limiting sleeve 36 is inserted into the limiting post 27. A fixed shaft 319 is connected to one side of the L-shaped limiting sleeve 36, and the fixed shaft 319 is inserted into the reciprocating screw 33.

[0033] It should be noted that the wind force drives the impeller 31 to rotate on the rack 25. At the same time, the impeller 31 is movably connected to the sealing plate 32, so that the sealing plate 32 does not rotate when the impeller 31 rotates, thus ensuring the normal operation of the device. At the same time, when the impeller 31 rotates, it drives the L-shaped limiting sleeve 36 to rotate inside the rack 25, which restricts the impeller 31. When the L-shaped limiting sleeve 36 rotates, it drives the fixed shaft 319 on one side to rotate. The rotation of the fixed shaft 319 drives the reciprocating screw 33 to rotate. The rotation of the reciprocating screw 33 drives the suction plate 321 to move along the thread on the reciprocating screw 33 through the ball nut pair connection.

[0034] In an optional embodiment, a first one-way valve is provided inside the intake pipe 34, and a second one-way valve is provided inside the first exhaust pipe 35. One end of the first exhaust pipe 35 passes through the limiting cylinder 210 and communicates with the buffer cylinder 37.

[0035] It should be noted that external gas is drawn in through the suction pipe 34 and discharged through the first exhaust pipe 35. At the same time, the gas backflow is prevented by the first one-way valve inside the suction pipe 34 and the second one-way valve inside the first exhaust pipe 35. The gas enters the buffer cylinder 37 through the first exhaust pipe 35 to inflate the buffer cylinder 37.

[0036] In an optional embodiment, a first spring 39 is provided inside the buffer cylinder 37. One end of the first spring 39 is connected to the inner wall of the buffer cylinder 37, and the other end of the first spring 39 is connected to the buffer plate 38. One end of the buffer plate 38 is movably connected to the bottom of the lifting platform 26.

[0037] It should be noted that as the amount of gas inside the buffer cylinder 37 increases, the gas pressure overcomes the elastic force of the first spring 39, thereby pushing the buffer plate 38 to move and compress the lifting platform 26, thus buffering the equipment on the lifting platform 26 when it descends, and protecting the equipment on the lifting platform 26 in the event of an unexpected sudden drop.

[0038] In an optional embodiment, one end of the first exhaust pipe 35 is connected to the second exhaust pipe 311, one end of the second exhaust pipe 311 is connected to the air cylinder 312, a pressure valve is provided inside the second exhaust pipe 311, an L-shaped fixing plate 313 is provided on one side of the base 1, and a squeezing column 315 is provided inside the air cylinder 312, one end of the squeezing column 315 is connected to the ratchet 314.

[0039] It should be noted that when a certain amount of gas is filled into the buffer cylinder 37, and the gas pressure exceeds the threshold of the pressure valve inside the second exhaust pipe 311, the gas inside the first exhaust pipe 35 enters the inflation cylinder 312 through the second exhaust pipe 311, squeezing the extrusion column 315 inside the inflation cylinder 312, pushing the extrusion column 315 to move, thereby driving the ratchet 314 to move. When the ratchet 314 moves, it drives the push rod 317 and the second limiting block 320 to move inside the limiting sleeve 310. At the same time, when the rotating shaft 23 rotates, it drives the second limiting block 320 to rotate through the limiting cylinder 210, thereby driving the ratchet 314 to rotate synchronously.

[0040] In an optional embodiment, a second spring 318 is sleeved on the outside of the push rod 317. One end of the second spring 318 is connected to the ratchet 314, and the other end of the second spring 318 is fixedly connected to the base 1. One end of the push rod 317 moves inside the limiting sleeve 310. The L-shaped fixing plate 313 is fixedly connected to the first limiting block 316. One end of the push rod 317 is connected to the second limiting block 320, and the second limiting block 320 moves inside the limiting sleeve 310.

[0041] It should be noted that when the internal air pressure of the air cylinder 312 is high, the ratchet 314 drives the push rod 317 to move, and at the same time squeezes the second spring 318, so that the ratchet 314 moves and engages with the first limiting block 316 on the L-shaped fixed plate 313, thereby preventing the ratchet 314 from rotating. When the wind force is continuously strong, it locks the lifting operation to avoid affecting the lifting operation when the wind force is strong, thus affecting the safety of the lifting operation.

[0042] Working principle: The electrical equipment to be lifted is placed on the lifting platform 26 through the opening on the protective cover 29. At the same time, the motor 22 is started. When the motor 22 rotates, it drives the gear 24 to rotate through the rotating shaft 23. The gear 24 meshes with the rack 25, which drives the rack 25 to rise inside the limiting cylinder 210. When the rack 25 rises, it drives the lifting platform 26 to move synchronously, thereby lifting the electrical equipment placed on the lifting platform 26 to the required height for installation.

[0043] Simultaneously, when strong winds occur during lifting, the wind force drives the impeller 31 to rotate on the rack 25. The impeller 31 is movably connected to the sealing plate 32, thus preventing the sealing plate 32 from rotating when the impeller 31 rotates, ensuring normal operation of the device. Simultaneously, the rotation of the impeller 31 causes the L-shaped limiting sleeve 36 to rotate inside the rack 25, restricting the impeller 31. The rotation of the L-shaped limiting sleeve 36 also causes the fixed shaft 319 on one side to rotate, which in turn drives the reciprocating screw 33 to rotate. The rotation of the reciprocating screw 33, through a ball nut assembly, drives the suction disc 321 to rotate on the reciprocating screw 33. The device moves along the thread, thereby drawing in external gas through the suction pipe 34 and simultaneously expelling the drawn-in gas through the first exhaust pipe 35. Backflow of gas is prevented by the first one-way valve inside the suction pipe 34 and the second one-way valve inside the first exhaust pipe 35. Gas enters the buffer cylinder 37 through the first exhaust pipe 35, inflating it. As the amount of gas inside the buffer cylinder 37 increases, the gas pressure overcomes the elastic force of the first spring 39, thereby pushing the buffer plate 38 to move and compress the lifting platform 26, thus buffering the device as it descends on the lifting platform 26.

[0044] Simultaneously, when a certain amount of gas is filled into the buffer cylinder 37, and the gas pressure exceeds the threshold of the pressure valve inside the second exhaust pipe 311, the gas inside the first exhaust pipe 35 enters the inflation cylinder 312 through the second exhaust pipe 311, squeezing the extrusion column 315 inside the inflation cylinder 312, pushing the extrusion column 315 to move, thereby driving the ratchet 314 to move. When the ratchet 314 moves, it drives the push rod 317 and the second limiting block 320 to move inside the limiting sleeve 310. At the same time, when the rotating shaft 23 rotates, it drives the second limiting block 320 to rotate through the limiting cylinder 210, thereby driving the ratchet 314 to rotate synchronously. At the same time, when the air pressure inside the inflation cylinder 312 is high, the ratchet 314 drives the push rod 317 to move, and simultaneously squeezes the second spring 318, causing the ratchet 314 to move and engage with the first limiting block 316 on the L-shaped fixing plate 313, thereby preventing the ratchet 314 from rotating.

[0045] 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 scope of which is defined by the appended claims and their equivalents.

Claims

1. A stable lifting device for installing power facilities, comprising a base (1), characterized in that, A lifting mechanism (2) is installed on the base (1); The lifting mechanism (2) includes a rotating shaft (23) that rotates on a base (1), a gear (24) fixed on the rotating shaft (23), a rack (25) meshing on one side of the gear (24), a limiting cylinder (210) sleeved on the outside of the rack (25), a lifting platform (26) connected to one side of the rack (25) through the limiting cylinder (210), and a protective mechanism (3) provided on the rack (25). The protective mechanism (3) includes a windmill (31) rotating on a rack (25), a sealing plate (32) movable inside the windmill (31), an air extraction plate (321) movable at the bottom of the sealing plate (32), an air intake pipe (34) connected to one end of the sealing plate (32), a first exhaust pipe (35) connected to one side of the air intake pipe (34) on the sealing plate (32), a buffer cylinder (37) connected to one end of the first exhaust pipe (35), and a buffer plate movable inside the buffer cylinder (37). (38) The other end of the first exhaust pipe (35) is connected to an air cylinder (312). A ratchet (314) is movable on the base (1). A push rod (317) is movable on one side of the ratchet (314). A limiting sleeve (310) is provided on one side of the base (1). A second limiting block (320) is provided on one end of the push rod (317). The second limiting block (320) moves inside the limiting sleeve (310). A first limiting block (316) is fixed on one side of the ratchet (314).

2. The stable lifting equipment for power facility installation according to claim 1, characterized in that, A fixed platform (21) is fixed on one side of the base (1), and a motor (22) is fixed on the fixed platform (21). The output end of the motor (22) is connected to the rotating shaft (23).

3. The stable lifting equipment for power facility installation according to claim 1, characterized in that, Fixed columns are provided on both sides of the rotating shaft (23). The gear (24) rotates inside the two sets of fixed columns on the rotating shaft (23). One end of the fixed column is fixedly connected to the base (1).

4. A stable lifting device for power facility installation according to claim 1, characterized in that, The rack (25) has a limiting post (27) inside, and the limiting post (27) is fixedly connected to the base (1).

5. A stable lifting device for power facility installation according to claim 1, characterized in that, A limiting groove (28) is provided on the lifting platform (26), and a protective cover (29) is inserted into the limiting groove (28).

6. A stable lifting device for power facility installation according to claim 1, characterized in that, The bottom of the sealing plate (32) is fixed with a reciprocating screw (33), and an air extraction plate (321) slides on the reciprocating screw (33). The bottom of the impeller (31) is provided with an L-shaped limiting sleeve (36), which is inserted into the limiting post (27). A fixed shaft (319) is connected to one side of the L-shaped limiting sleeve (36), and the fixed shaft (319) is inserted into the reciprocating screw (33).

7. A stable lifting device for power facility installation according to claim 1, characterized in that, The intake pipe (34) is equipped with a first one-way valve, and the exhaust pipe (35) is equipped with a second one-way valve. One end of the first exhaust pipe (35) passes through the limiting cylinder (210) and is connected to the buffer cylinder (37).

8. A stable lifting device for power facility installation according to claim 1, characterized in that, The buffer cylinder (37) is provided with a first spring (39) inside. One end of the first spring (39) is connected to the inner wall of the buffer cylinder (37), and the other end of the first spring (39) is connected to the buffer plate (38). One end of the buffer plate (38) is movably connected to the bottom of the lifting platform (26).

9. A stable lifting device for power facility installation according to claim 1, characterized in that, One end of the first exhaust pipe (35) is connected to the second exhaust pipe (311), one end of the second exhaust pipe (311) is connected to the air cylinder (312), a pressure valve is provided inside the second exhaust pipe (311), an L-shaped fixing plate (313) is provided on one side of the base (1), a squeezing column (315) is provided inside the air cylinder (312), and one end of the squeezing column (315) is connected to the ratchet (314).

10. A stable lifting device for power facility installation according to claim 1, characterized in that, The push rod (317) is fitted with a second spring (318) on its outer side. One end of the second spring (318) is connected to the ratchet (314), and the other end of the second spring (318) is fixedly connected to the base (1). One end of the push rod (317) moves inside the limiting sleeve (310). The L-shaped fixing plate (313) is fixedly connected to the first limiting block (316). One end of the push rod (317) is connected to the second limiting block (320), and the second limiting block (320) moves inside the limiting sleeve (310).

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