Hoisting device for transferring and installing transformer coil

Abstract

The invention relates to the technical field of coil transportation, in particular to a hoisting device for transformer coil transfer and installation, which comprises an installation frame, an air cylinder is fixed at the top end of the installation frame, and a transmission end of the air cylinder penetrates and extends to the bottom of the installation frame to fix a fixed frame; a grabbing mechanism is arranged, a clamping plate is driven by a second motor to clamp a coil, the clamping plate moves towards a fixed plate in the clamping process, a movable plate is ejected out by a convex block and deflects while moving, the movable plate is assisted in clamping the coil, and when an electrical insertion column and an electrical socket are clamped to form electrical connection, the clamping plate is driven by the second motor to clamp the coil. Therefore, the second motor is controlled to stop working, and the situation that the coil is damaged due to too large clamping force is avoided. The four suction cups and the sealing blocks are driven by the air cylinders to ascend and descend, when the fixing frame integrally ascends and descends, the sealing plates extrude the air bags, the air bags exhaust air in the air bags and blow and clean dust on the surfaces of the coils, the suction cups make contact with the coils and adsorb the coils, and therefore coil grabbing is assisted.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer coil transportation, and particularly relates to a hoisting device for transporting and installing a transformer coil. Background Art

[0002] The transformer coil is an important component inside the transformer. The handling and installation of the transformer coil generally involve pressing the forged steel plate into a bent shape, opening lifting ports at both ends of the section steel plate, passing one end of the forged steel plate through the center of the transformer coil, and then connecting the two lifting ports through a hoisting device. The coil is lifted into the transformer housing by the cooperation of the hoisting device and the forged steel plate to achieve the purpose of installing the transformer coil. For example, Chinese Patent with the application number 202010789406.8 discloses a hoisting tool for a transformer coil. Since the hook plates are arranged horizontally and parallelly, this device can avoid the height dislocation of the transformer coil during transportation, prevent the deformation of the transformer coil, and ensure the integrity of the transformer coil. However, the grasping method of this device is single, it is difficult to perform corresponding grasping methods on the coil according to different placement requirements, the scope of use is relatively limited, and only a single device is used for grasping during the grasping process, so the safety cannot be guaranteed, and there may be relatively large potential safety hazards. In view of the above technical defects, a solution is now proposed. Summary of the Invention

[0003] The purpose of the present invention is to solve the problem that the hoisting device for transporting and installing a transformer coil in the prior art cannot clamp and grasp various coils and the safety cannot be guaranteed, and to propose a hoisting device for transporting and installing a transformer coil.

[0004] To achieve the above purpose, the present invention adopts the following technical solution: A hoisting device for transporting and installing a transformer coil, including a mounting frame. A cylinder is fixed at the top of the mounting frame. The transmission end of the cylinder penetrates and extends to the bottom of the mounting frame and is fixed with a fixing frame. Two mounting plates are symmetrically fixed on both sides of the bottom of the fixing frame. Two vacuum pumps are symmetrically fixed at the front and rear ends of the upper surface of the mounting plate. The output end of the vacuum pump penetrates and extends to the bottom of the mounting plate and is fixed with a suction cup. Two fixing blocks are symmetrically arranged on both sides inside the mounting frame. A second motor is fixed inside the fixing block. The transmission end of the second motor is fixed with a second lead screw. A telescopic block slidably connected inside the fixing block is sleeved on the outer layer of the second lead screw. One side of the telescopic block penetrates and extends outside the fixing block and is equipped with a grasping mechanism.

[0005] Furthermore, the grasping mechanism includes a fixing plate fixed to one side of the telescopic block. At the four corners on one side of the fixing plate, fixing seats are fixed. Inside the fixing seats, plug posts are slidably connected. A second limiting plate is sleeved on the outer layer of one side of the plug post inside the fixing seat. An electrical plug post is fixed to one side of the second limiting plate, and an electrical socket is fixed at the position corresponding to the electrical plug post inside the fixing seat.

[0006] Furthermore, one side of the plug post penetrates and extends to the outside of the fixing seat and is fixed with a clamping plate. A second spring sleeved on the outside of the fixing seat is fixed between the fixing plate and the clamping plate. Two sliding plate movable plates are symmetrically rotatably connected to the upper and lower ends of the clamping plate. A number of anti-slip strips are equidistantly fixed on the side surfaces of the clamping plate and the sliding plate movable plates. The sliding plate movable plate can only rotate unidirectionally by 90°.

[0007] Furthermore, bumps are slidably connected to the upper and lower ends on the side surface of the fixing plate corresponding to the positions of the sliding plate movable plates. Knobs are arranged at the positions corresponding to the bumps at the front and rear ends of the fixing plate. One end of the knob is fixed with a bolt that penetrates and extends into the inside of the fixing plate. Screw holes are opened at the positions corresponding to the bolts at the front and rear ends on one side of the bump.

[0008] Furthermore, a screw sleeve that penetrates and extends into the inside of the mounting frame is fixed to one side of the fixing block. A through groove is opened at the position corresponding to the fixing block on the inner side of the mounting frame. A first lead screw rotatably connected to the two sides inside the mounting frame penetrates through the inside of the screw sleeve. A worm gear is fixed to the top end of the first lead screw. A worm is arranged at the rear end of the worm gear. A rotating shaft penetrates through the inside of the two worms. One side of the rotating shaft penetrates and extends to the outside of the mounting frame and is fixed with a first motor.

[0009] Furthermore, a fixing rod is fixed to the bottom of the fixing frame. A lifting cylinder is slidably sleeved on the outer layer of the bottom of the fixing rod, and a first limiting plate is fixed to the outer layer of the lifting cylinder. Two sliding rods fixed to the upper surface of the lifting cylinder are symmetrically slidably connected to both sides of the first limiting plate. A first spring fixed between the first limiting plate and the lifting cylinder is sleeved on the outer layer of the sliding rod. A sealing plate is fixed to the bottom end of the fixing rod inside the lifting cylinder. An airbag is fixed to the bottom of the sealing plate. A sealing block sleeved on the outside of the airbag is fixed to the bottom of the lifting cylinder. A number of air holes are equidistantly opened on the outside of the sealing block.

[0010] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are: 1. In the present invention, a grasping mechanism is provided. The second motor drives the second lead screw to rotate, thereby driving the telescopic block to move. The clamping plate is driven by the telescopic block to clamp the coil. During the clamping process, the clamping plate moves towards the fixed plate. During the movement, it is buffered by the rebounding force of the first spring. At the same time, the movable plate is pushed out and deflected by the convex block until it rotates 90°. The movable plate is assisted to clamp the coil. When the movable plate rotates to 90°, the electrical plug post is engaged with the electrical socket to form an electrical connection, thereby controlling the second motor to stop working, avoiding continuously driving the moving block to move, and further preventing the situation that the clamping force is too large and damages the coil. When the overall width and height of the coil cannot be clamped, the knob is rotated to drive the bolt out of the screw hole. Then, when the clamping plate drives the movable plate to move, the convex block cannot form a pushing effect on the movable plate because it cannot be fixed, thereby forming an overall clamping effect on the coil with a larger width. The clamping method is diverse and can grasp various coils.

[0011] 2. In the present invention, the cylinder drives the fixed frame to lift and lower. The lifting and lowering of the fixed frame drives the four suction cups and the sealing block at the bottom to lift and lower. The height of the sealing block is lower than that of the suction cups. When the fixed frame is lifted and lowered as a whole, the sealing block first contacts the coil. As the fixed frame continues to descend, the sealing plate squeezes the airbag. After being squeezed, the airbag discharges the internal air, and the air is discharged through the air holes on the side of the sealing block, thereby blowing and cleaning the dust on the surface of the coil. Then, as the fixed frame continues to descend, the suction cups contact and adsorb the coil, and a negative pressure effect is formed by the vacuum pump to adsorb and fix the coil, thereby assisting in grasping the coil and making the overall grasping effect more stable.

[0012] In summary, the device laterally clamps the coil through the picking mechanism to maintain the stability of the coil during the clamping process. At the same time, the clamping force is controlled through the touch effect during the clamping process, thereby maintaining the clamping stability and avoiding damage to the coil caused by excessive external force. At the same time, the suction cups are used to assist in grasping the coil to ensure the stability during the hoisting process, greatly reducing the safety hazard. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the structural schematic diagram inside the mounting frame of the present invention; Figure 3 is the structural schematic diagram inside the fixed block and the moving block of the present invention; Figure 4 is Figure 1 the enlarged view of part A in Figure 5 is the structural schematic diagram inside the fixed seat of the present invention; Figure 6 is the structural schematic diagram inside the fixed plate of the present invention; Figure 7 Structural schematic diagram of the fixing frame of the present invention; Figure 8 Structural schematic diagram inside the lifting cylinder of the present invention.

[0014] Reference numerals: 1, mounting frame; 2, cylinder; 3, through groove; 4, fixing frame; 5, grasping mechanism; 6, first motor; 7, worm; 8, rotating shaft; 9, worm gear; 10, fixing block; 11, telescopic block; 12, screw sleeve; 13, first lead screw; 14, bolt; 15, screw hole; 16, second motor; 17, second lead screw; 18, vacuum pump; 19, suction cup; 20, air hole; 21, sealing block; 22, lifting cylinder; 23, first limiting plate; 24, sliding rod; 25, first spring; 26, fixing rod; 27, sealing plate; 28, airbag; 29, knob; 30, convex block; 31, inserting post; 32, clamping plate; 33, anti-slip strip; 34, movable plate; 35, fixing plate; 36, second spring; 37, fixing seat; 38, second limiting plate; 39, electrical inserting post; 40, electrical socket; 41, mounting plate. Detailed implementation manners

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0016] Embodiment 1

[0017] In this embodiment, for the problem that most of the lifting devices for transporting and installing transformer coils in the prior art have a single grasping method, it is difficult to perform corresponding grasping methods on the coils according to different placement requirements, and the scope of use is relatively limited.

[0018] Such as Figures 1-6As shown in the figure, a hoisting device for transporting and installing a transformer coil includes an installation frame 1. Two fixing blocks 10 are symmetrically arranged on both sides inside the installation frame 1. A second motor 16 is fixed inside the fixing block 10. The transmission end of the second motor 16 is fixed with a second lead screw 17. An expansion block 11 that is slidably connected inside the fixing block 10 is sleeved on the outer layer of the second lead screw 17. One side of the expansion block 11 penetrates and extends outside the fixing block 10 and is installed with a grasping mechanism 5. The grasping mechanism 5 includes a fixing plate 35 fixed on one side of the expansion block 11. Four corners on one side of the fixing plate 35 are all fixed with fixing seats 37. A plug post 31 is slidably connected inside the fixing seat 37. A second limit plate 38 is sleeved on the outer layer of one side of the plug post 31 inside the fixing seat 37. An electrical plug post 39 is fixed on one side of the second limit plate 38. An electrical socket 40 is fixed at the position corresponding to the electrical plug post 39 inside the fixing seat 37. The state between the electrical plug post 39 and the electrical socket 40 is used to control the second motor 16, avoiding the situation of continuously applying pressure after grasping and clamping the coil, thereby damaging the coil; One side of the plug post 31 penetrates and extends outside the fixing seat 37 and is fixed with a clamping plate 32. A second spring 36 sleeved on the outside of the fixing seat 37 is fixed between the fixing plate 35 and the clamping plate 32. A buffering effect on the clamping plate 32 is formed through the second spring 36, avoiding damage to the coil caused by sudden increased pressure. Two sliding plate movable plates 34 are symmetrically rotatably connected to the upper and lower ends of the clamping plate 32. A number of anti-slip strips 33 are evenly fixed on the side surfaces of the clamping plate 32 and the sliding plate movable plates 34. The friction with the coil is increased by relying on the anti-slip strips 33 to avoid the situation of the coil slipping. The sliding plate movable plate 34 can only rotate unidirectionally by 90°. The sliding plate movable plate 34 is designed with a damping rotation. When the convex block 30 is in an unfixed state, it cannot form a pushing effect on the sliding plate movable plate 34. Convex blocks 30 are slidably connected to the upper and lower ends of the side surface of the fixing plate 35 corresponding to the position of the sliding plate movable plate 34. Knobs 29 are arranged at the positions corresponding to the convex blocks 30 at the front and rear ends of the fixing plate 35. One end of the knob 29 is fixed with a bolt 14 that penetrates and extends inside the fixing plate 35. Screw holes 15 are opened at the positions corresponding to the bolt 14 at the front and rear ends of one side of the convex block 30; One side of the fixing block 10 is fixed with a screw sleeve 12 that penetrates and extends inside the installation frame 1. A through groove 3 is opened at the position corresponding to the fixing block 10 on the inner side of the installation frame 1. A first lead screw 13 that is rotatably connected to the inner sides of both sides of the installation frame 1 penetrates inside the screw sleeve 12. A worm gear 9 is fixed at the top of the first lead screw 13. A worm 7 is arranged at the rear end of the worm gear 9. A rotating shaft 8 is jointly penetrated and connected inside the two worms 7. One side of the rotating shaft 8 penetrates and extends outside the installation frame 1 and is fixed with a first motor 6.

[0019] When performing grasping, the first motor 6 is started to drive the rotation of the rotating shaft 8. The rotation of the rotating shaft 8 drives the rotation of the worm 7. The rotation of the worm 7 drives the rotation of the worm gear 9. Relying on the rotation of the worm gear 9, the first lead screw 13 is driven to rotate, thereby driving the lifting of the nut sleeve 12. The lifting of the nut sleeve 12 drives the lifting of the grasping mechanism 5 until it reaches the position of the coil. The second motor 16 is started to drive the rotation of the second lead screw 17. The rotation of the second lead screw 17 drives the movement of the telescopic block 11. The movement of the telescopic block 11 drives the clamping plate 32 to closely adhere to the surface of the coil. As the clamping plate 32 continues to move, the sliding plate movable plate 34 is deflected by the pushing of the convex block 30. During the movement of the clamping plate 32, the insertion post 31 is driven to move. The movement of the insertion post 31 drives the movement of the second limiting plate 38. The movement of the second limiting plate 38 drives the movement of the electrical insertion post 39 until it is snap-fitted and fixed with the electrical socket 40. At this time, the second motor 16 is turned off. At this time, it is in the just right state of fixedly grasping the coil and will not cause damage to it. At the same time, the sliding plate movable plate 34 is deflected to 90°, thereby forming a grasping and fixing effect on the coil; When the width of the coil is too large and it cannot be grasped and fixed by the sliding plate movable plate 34, the knob 29 is rotated to drive the rotation of the bolt 14. The rotation of the bolt 14 is disengaged from the screw hole 15, thereby releasing the fixing effect on the convex block 30. At this time, when the clamping plate 32 moves, the convex block 30 cannot push the sliding plate movable plate 34. The sliding plate movable plate 34 cannot be deflected and clamps and grasps the coil together with the clamping plate 32, increasing the overall picking area, increasing the friction force with the coil, and making the grasping effect more stable.

[0020] Embodiment 2

[0021] In order to solve the problem that in the prior art, the hoisting device for transporting and installing the transformer coil only grasps through a single device during the grasping process, the safety is difficult to guarantee and there may be relatively large potential safety hazards.

[0022] Such as Figures 7-8As shown in the figure, the embodiment is a hoisting device for transporting and installing a transformer coil. At the top of the mounting frame 1, a cylinder 2 is fixed. The transmission end of the cylinder 2 penetrates and extends to the bottom of the mounting frame 1 and is fixed with a fixing frame 4. On both sides of the bottom of the fixing frame 4, two mounting plates 41 are symmetrically fixed. At the front and rear ends of the upper surface of the mounting plate 41, two vacuum pumps 18 are symmetrically fixed. The output end of the vacuum pump 18 penetrates and extends to the bottom of the mounting plate 41 and is fixed with a suction cup 19. At the bottom of the fixing frame 4, a fixing rod 26 is fixed. The outer layer of the bottom of the fixing rod 26 is slidably sleeved with a lifting cylinder 22. And on the outer layer of the lifting cylinder 22, a first limiting plate 23 is fixed. On both sides of the first limiting plate 23, two sliding rods 24 fixed to the upper surface of the lifting cylinder 22 are symmetrically slidably connected. The outer layer of the sliding rod 24 is sleeved with a first spring 25 fixed between the first limiting plate 23 and the lifting cylinder 22. At the bottom end of the fixing rod 26, a sealing plate 27 is fixed inside the lifting cylinder 22. At the bottom of the sealing plate 27, an airbag 28 is fixed. At the bottom of the lifting cylinder 22, a sealing block 21 sleeved outside the airbag 28 is fixed. The height of the airbag 28 is lower than that of the suction cup 19, which is convenient for the airbag 28 to contact the coil first, so as to clean the surface of the coil, and thus clean the floating dust on the surface of the coil, avoiding affecting the subsequent adsorption effect. At the same time, the surface dust enters the vacuum pump 18 through the suction cup 19, resulting in a shortened service life of the vacuum pump 18. A number of air holes 20 are equidistantly arranged on the outer side of the sealing block 21.

[0023] When grasping the coil, start the cylinder 2 to drive the fixing frame 4 to descend. During the descent of the fixing frame 4, the sealing block 21 is driven to descend to the surface of the coil first. As the fixing frame 4 continues to descend, the fixing rod 26 drives the sealing plate 27 to squeeze the airbag 28. The airbag 28 is squeezed to expel the air inside, and the expelled air is discharged through the air holes 20, so as to form a blowing and cleaning effect on the dust on the surface of the coil, facilitating the subsequent adsorption and fixation of the coil by the suction cup 19. As the fixing frame 4 continues to descend, the suction cup 19 descends to the surface of the coil and squeezes and adsorbs. Start the vacuum pump 18 to pump out the air inside the suction cup 19, so as to form a negative pressure effect to adsorb and fix the coil and assist in clamping and grasping.

[0024] The working process and principle of the present invention: Step 1: When performing grasping, start the first motor 6 to drive the rotation of the rotating shaft 8. The rotation of the rotating shaft 8 drives the rotation of the worm 7. The rotation of the worm 7 drives the rotation of the worm gear 9. Relying on the rotation of the worm gear 9 to drive the rotation of the first lead screw 13, and then drive the lifting of the nut sleeve 12. Through the lifting of the nut sleeve 12, drive the grasping mechanism 5 to lift until it reaches the position of the coil. Start the second motor 16 to drive the rotation of the second lead screw 17. The rotation of the second lead screw 17 drives the movement of the telescopic block 11. The movement of the telescopic block 11 drives the clamping plate 32 to closely adhere to the surface of the coil. As the clamping plate 32 continues to move, the sliding plate movable plate 34 is deflected by the top of the convex block 30. During the movement of the clamping plate 32, it drives the movement of the plug post 31. The movement of the plug post 31 drives the movement of the second limit plate 38. The movement of the second limit plate 38 drives the movement of the electrical plug post 39 until it is engaged and fixed with the electrical socket 40. At this time, the second motor 16 is turned off. At this time, it is in the just right state of fixedly grasping the coil and will not cause damage to it. At the same time, the sliding plate movable plate 34 is deflected to 90°, thereby forming a grasping and fixing effect on the coil; When the width of the coil is too large and cannot be grasped and fixed by the sliding plate movable plate 34, rotate the knob 29 to drive the rotation of the bolt 14. The rotation of the bolt 14 is disengaged from the screw hole 15, thereby releasing the fixing effect on the convex block 30. At this time, when the clamping plate 32 moves, the convex block 30 cannot form a top effect on the sliding plate movable plate 34. The sliding plate movable plate 34 cannot be deflected and together with the clamping plate 32 clamps and grasps the coil, increasing the overall picking area, improving the friction with the coil, and making the grasping effect more stable; Step 2: When grasping the coil, start the cylinder 2 to drive the fixed frame 4 to descend. During the descent of the fixed frame 4, drive the sealing block 21 to first descend to the surface of the coil. As the fixed frame 4 continues to descend, the fixed rod 26 drives the sealing plate 27 to squeeze the airbag 28. The airbag 28 is squeezed to discharge the internal air. The discharged air is discharged through the air hole 20, thereby forming a blowing and cleaning effect on the dust on the surface of the coil, facilitating the subsequent adsorption and fixation of the coil by the suction cup 19. As the fixed frame 4 continues to descend, the suction cup 19 descends to the surface of the coil and squeezes and adsorbs. Start the vacuum pump 18 to pump out the air inside the suction cup 19, thereby forming a negative pressure effect to adsorb and fix the coil and assisting in clamping and grasping.

[0025] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A hoisting device for transporting and installing a transformer coil, comprising an installation frame, characterized in that, A cylinder is fixed to the top end of the mounting frame. The transmission end of the cylinder penetrates and extends to the bottom of the mounting frame and is fixed with a fixed frame. Two mounting plates are symmetrically fixed to both sides of the bottom of the fixed frame. Two vacuum pumps are symmetrically fixed to the front and rear ends of the upper surface of the mounting plate. The output end of the vacuum pump penetrates and extends to the bottom of the mounting plate and is fixed with a suction cup. Two fixing blocks are symmetrically arranged on both sides inside the mounting frame. A second motor is fixed inside the fixing block. The transmission end of the second motor is fixed with a second lead screw. A telescopic block slidingly connected inside the fixing block is sleeved on the outer layer of the second lead screw. A grasping mechanism is installed on one side of the telescopic block and penetrates and extends to the outside of the fixing block.

2. The hoisting device for transporting and installing a transformer coil according to claim 1, characterized in that, The grasping mechanism includes a fixing plate fixed to one side of the telescopic block. Fixed seats are fixed at the four corners on one side of the fixing plate. A plug post is slidably connected inside the fixed seat. A second limiting plate is sleeved on the outer layer of one side of the plug post inside the fixed seat. An electric plug post is fixed to one side of the second limiting plate. An electric socket is fixed at the position corresponding to the electric plug post inside the fixed seat.

3. The hoisting device for transporting and installing a transformer coil according to claim 2, wherein, One side of the plug post penetrates and extends to the outside of the fixed seat and is fixed with a clamping plate. A second spring sleeved on the outside of the fixed seat is fixed between the fixing plate and the clamping plate. Two sliding plate movable plates are symmetrically rotatably connected to the upper and lower ends of the clamping plate. A plurality of anti-slip strips are equidistantly fixed to the side surfaces of the clamping plate and the sliding plate movable plate. The sliding plate movable plate can only rotate 90° unidirectionally.

4. A hoisting device for transporting and installing a transformer coil according to claim 3, characterized in that, Protrusions are slidably connected to the upper and lower ends of the side surface of the fixing plate corresponding to the positions of the sliding plate movable plates. Knobs are arranged at the positions corresponding to the protrusions at the front and rear ends of the fixing plate. One end of the knob is fixed with a bolt that penetrates and extends into the fixing plate. Screw holes are opened at the positions corresponding to the bolts at the front and rear ends of one side of the protrusion.

5. The hoisting device for transporting and installing a transformer coil according to claim 1, characterized in that, A screw sleeve that penetrates and extends into the mounting frame is fixed to one side of the fixing block. A through groove is opened at the position corresponding to the fixing block on the inner side of the mounting frame. A first lead screw rotatably connected to the inner sides of both sides of the mounting frame penetrates through the screw sleeve. A worm gear is fixed to the top end of the first lead screw. A worm is arranged at the rear end of the worm gear. A rotating shaft penetrates through the two worms. One side of the rotating shaft penetrates and extends to the outside of the mounting frame and is fixed with a first motor.

6. A hoisting device for transporting and installing a transformer coil according to claim 1, characterized in that, A fixed rod is fixed to the bottom of the fixed frame. A lifting cylinder is slidably sleeved on the outer layer of the bottom of the fixed rod. A first limiting plate is fixed to the outer layer of the lifting cylinder. Two sliding rods fixed to the upper surface of the lifting cylinder are symmetrically slidably connected to both sides of the first limiting plate. A first spring fixed between the first limiting plate and the lifting cylinder is sleeved on the outer layer of the sliding rod. A sealing plate is fixed to the bottom end of the fixed rod inside the lifting cylinder. An airbag is fixed to the bottom of the sealing plate. A sealing block sleeved on the outside of the airbag is fixed to the bottom of the lifting cylinder. A plurality of air holes are equidistantly opened on the outer side of the sealing block.

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