An unlocking structure

Abstract

This invention discloses an unlocking structure and unlocking method, comprising: a traction rope, one end of which is fixedly connected to a first locking member, and a first locking groove corresponding to the position of the locking member; the other end of which is fixedly connected to a second locking member, and a second locking groove corresponding to the position of the locking member; initially, the first locking member and the first locking groove are engaged, and the second locking member and the second locking groove are engaged, thereby forming a locked state; a pressing part, which is linked to a pressing element, and when unlocking is required, pressing the operating rod and driving the control guide wheel to slide downward relative to the first sliding groove through the connecting pull rod, and using the control guide wheel to pull the traction rope, at which time the left end of the traction rope pulls the left locking assembly downward under the action of the left guide wheel, and at the same time the right end of the traction rope pulls the right locking assembly downward under the action of the right guide wheel, thereby realizing the synchronous unlocking of the left and right locking assemblies.

Description

Technical Field

[0001] This invention relates to the field of lift component technology, specifically to an unlocking structure and unlocking method applicable to column lifts. Background Technology

[0002] A lift is a mechanical device used to raise heavy objects (most commonly cars) to a certain height for maintenance, inspection, parking, and other work. It is an indispensable core piece of equipment in places such as auto repair shops, 4S shops, and tire shops. It is generally equipped with a locking mechanism to prevent the hydraulic system from malfunctioning and causing the object to fall.

[0003] In the prior art, Chinese patent application number CN201010565507.3 discloses an emergency unlocking device for a lift safety mechanism, including a base beam, a pair of columns, a support arm movably mounted on each column via a slide, a hydraulic cylinder located within the column cavity, a piston rod mounted on the hydraulic cylinder and a plate chain cooperating with the piston rod, a hydraulic pump station connected to the hydraulic cylinder via an oil pipe, a return valve rod and a motor mounted on the hydraulic pump station, multiple stops spaced apart on the inner wall of the column, and a safety mechanism mounted on the slide. The safety mechanism includes a safety plate, a safety lock, a tension spring, and an unlocking cable. Its key feature is the addition of an emergency unlocking device between the hydraulic pump station and the oil pipe connecting the hydraulic cylinder. This emergency unlocking device includes a detachable jack and a three-way ball valve. The three-way ball valve is mounted on the oil pipe, and the detachable jack is connected to the three-way ball valve via a branch oil pipe. Advantages: It ensures the safety of the vehicle and personnel and extends the service life of the lift.

[0004] For example, in the prior art, Chinese patent application number CN202410022336.1 discloses a car lift, including a recessed bracket and a lifting pile lateral movement control mechanism. The recessed bracket includes a U-shaped base plate, and two support piles are fixedly connected to the bottom surface of the center of the U-shaped base plate. Two left and right corresponding support plates are provided on the upper side of the U-shaped base plate. The ends of the two support plates that are far apart from each other are respectively fixedly connected to the top of the two ends of the U-shaped base plate by screws. The middle part of the ends of the two support plates that are far apart from each other is respectively provided with a rectangular notch. The ends of the two support plates that are close to each other are fixed to the top of the support piles. The lifting pile lateral movement control mechanism is installed inside the U-shaped base plate.

[0005] For example, in the prior art, Chinese patent application number CN202510510517.3 discloses a lifting machine locking mechanism, including a lifting machine body, an adjusting threaded rod rotatably connected inside the lifting machine body, a rotating motor fixedly installed at the top of the lifting machine body, and the output shaft of the rotating motor fixedly installed with the adjusting threaded rod, a lifting machine base fixedly installed at one end of the lifting machine body, an installation plate fixedly installed inside the lifting machine body, and the installation plate is connected through the adjusting threaded rod, a ratchet fixedly installed on the outer periphery of the adjusting threaded rod, and the ratchet rotatably connected to the installation plate, a first pawl for limiting the position rotatably connected at the top of the installation plate, and a second pawl for limiting the position rotatably connected at the top of the installation plate, a first connecting spring fixedly installed at one end of the first pawl, and a second connecting spring fixedly installed at one end of the second pawl.

[0006] Based on the above information, it can be seen that the locking structure in the existing technology generally needs to be installed inside the left and right support columns of the lift. In actual use, after the lift is used, the staff needs to unlock the locking mechanisms on the left and right sides in turn. This process requires two operations before the lift can be lowered, making the overall operation quite cumbersome. Summary of the Invention

[0007] The purpose of this invention is to provide an efficient unlocking structure and unlocking method to solve the problem mentioned in the background art, which requires two unlocking operations and results in a cumbersome process.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an unlocking structure, comprising: A traction rope, one end of which is fixedly connected to a first locking member and a first locking groove corresponding to the position of the locking member; the other end of which is fixedly connected to a second locking member and a second locking groove corresponding to the position of the locking member; initially, the first locking member and the first locking groove are engaged, and the second locking member and the second locking groove are engaged, thereby forming a locked state; The pressing part is linked to a pressing component. When unlocking is required, the pressing component is driven to press the traction rope, thereby simultaneously pulling the first locking component out of the first locking slot and the second locking component out of the second locking slot, thus forming an unlocked state.

[0009] Preferably, the unlocking structure is used for locking and unlocking the vertical movement of the support arm of the column lift.

[0010] Preferably, the traction rope is a traction steel wire rope; the first locking component is a locking component rotatably installed on the outer side of the upper end of the left lifting assembly, and the second locking component is a locking component rotatably installed on the outer side of the upper end of the right lifting assembly. The locking assembly includes a locking block and an unlocking block that are rotatably connected to each other. A tension spring is installed on the upper external part of the locking block. The right end of the unlocking block is connected to the traction steel wire rope. The traction steel wire rope connects the left and right locking assemblies through a linkage mechanism and moves synchronously.

[0011] Preferably, it also includes a fixing plate that is fixedly installed on the inner walls of both the left and right support columns. The fixing plate has a locking groove inside that engages with the locking block. The first and second engaging grooves are the locking grooves.

[0012] Preferably, the linkage mechanism includes a left guide wheel rotatably mounted on the inner wall of the lower end of the left support column and a right guide wheel rotatably mounted on the outer side of the right lifting assembly, and the traction wire rope is wound around the outside of the left guide wheel and the right guide wheel.

[0013] Preferably, it further includes a control guide wheel and a tension guide wheel, wherein the control guide wheel and the tension guide wheel are in opposite directions.

[0014] Preferably, the pressing part includes a connecting rod installed at the top of the rotating shaft of the control guide wheel, and the lower end of the connecting rod is rotatably connected to the operating lever, and the pressing element is the right guide wheel.

[0015] Preferably, the left support column has a first groove and a second groove on its side, the control guide wheel is slidably connected to the first groove, the tension guide wheel is rotatably connected to the connecting slider, the connecting slider is slidably connected to the second groove, and a tension spring is fixedly installed between the lower surface of the connecting slider and the inner wall of the second groove.

[0016] Preferably, a manual pull rope is installed at the rear end of the unlocking block, and the top end of the manual pull rope is located at the same point as the traction wire rope.

[0017] Preferably, the traction wire rope is provided with a reset spring for resetting it, and the upper end of the reset spring is provided with a spring adjustment buckle.

[0018] Preferably, the storage box has a square-shaped connecting groove on the left side, and the application roller is inserted into the storage box through the connecting groove. The application roller is made of sponge material, and the position of the application roller corresponds to the position of the traction steel wire rope. A filling pipe connected to the lubricating oil pumping device is fixedly installed on the top of the storage box.

[0019] Preferably, the front and rear sides of the coating roller are coaxially fixedly equipped with driven gears for driving its rotation, and the driven gears are meshed with the driving gears, and the driving gears are coaxially fixedly installed with the upper guide wheel.

[0020] Compared with the prior art, the beneficial effects of the present invention are: the column lift has a highly efficient unlocking structure, which adopts a novel structural design, the details of which are as follows: 1. The lifting components inside the left and right support columns drive the support arms to move upward under hydraulic action, thereby achieving the purpose of lifting the car. After the lifting is completed, the locking components are locked into the locking grooves opened inside the fixed plate to achieve the purpose of automatic locking and avoid the danger of falling due to hydraulic device failure during the use of the device. Furthermore, when unlocking is required, the operator operates the lever outside the left support column. At this time, the lever drives the control guide wheel to slide downward relative to the first slide groove through the connecting rod. The control guide wheel pulls the traction steel wire rope. At this time, the left end of the traction steel wire rope pulls the left locking assembly downward under the action of the left guide wheel. At the same time, the right end of the traction steel wire rope pulls the right locking assembly downward under the action of the right guide wheel. Thus, the locking assemblies on both sides are unlocked synchronously with the locking groove. During this process, the operator only needs to operate once to achieve full unlocking through the linkage mechanism, making the overall operation more convenient and faster. Furthermore, a redundant design is adopted, retaining a double-sided unlocking design on the basis of single-sided unlocking. In the event of a failure of single-sided unlocking, the double-sided unlocking mechanism can still be used to unlock, ensuring the normal operation of the device. Furthermore, a tensioning guide wheel is installed inside the left support column. The tensioning guide wheel slides relative to the second slide groove through the connecting slider. A tensioning spring is fixedly installed between the lower surface of the connecting slider and the inside of the second slide groove. The elasticity of the tensioning spring is used to tighten the tensioning guide wheel and prevent the traction steel wire rope from loosening when the lifting assembly moves up and down.

[0021] 2. Storage boxes are installed on the inner side of the upper end of the left and right support columns. The storage boxes store special lubricating oil for traction wire ropes, and an application roller is installed on the outside of the storage boxes. The application rollers penetrate into the storage boxes through the connecting grooves to pick up the lubricating oil, and then apply the lubricating oil to the surface of the traction wire rope to reduce wear. Furthermore, when the traction steel wire rope moves, it drives the upper guide wheel that it is in conjunction with to rotate. During the rotation of the upper guide wheel, it drives the drive gear that is fixedly installed with it to rotate. During the rotation of the drive gear, it drives the driven gear that is meshed with it to rotate. In turn, the driven gear drives the coating roller to rotate, so that the coating roller applies the coating to the traction steel wire rope more evenly. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the traction rope in the unlocking structure of the present invention; Figure 2 This is a schematic diagram of the pressing part in the unlocking structure of the present invention; Figure 3 This is a schematic diagram of the overall southwest axis side structure of the unlocking structure in the present invention applied to a column lift. Figure 4 This is a schematic diagram of the overall southeast axis side structure of the unlocking structure of the present invention applied to a column lift; Figure 5 This is a schematic diagram of the cooperation structure between the left support column and the left lifting assembly of the present invention; Figure 6 This is a schematic diagram of the inner structure of the left lifting assembly of the present invention; Figure 7 This is a schematic diagram of the cooperation structure between the right support column and the right lifting assembly of the present invention; Figure 8 This is a schematic diagram of the connection relationship between the unlocking block and the locking block of the present invention; Figure 9 This is a schematic diagram of the traction wire rope layout structure of the present invention; Figure 10 This is a schematic diagram of the control guide wheel and tension guide wheel structure of the present invention; Figure 11 This is a schematic diagram of the storage box structure of the present invention; Figure 12 For the present invention Figure 11 Enlarged structural diagram at point B; Figure 13 This is a schematic diagram of the coating roller structure of the present invention.

[0023] In the diagram: 1. Left support column; 2. Right support column; 3. Connecting crossbeam; 4a. Left lifting assembly; 4b. Right lifting assembly; 5. Support arm; 6. Locking assembly; 601. Locking block; 602. Unlocking block; 603. Tension spring; 7. Fixing plate; 8. Locking groove; 9. Left guide wheel; 10. Right guide wheel; 11. Traction wire rope; 12. Control guide wheel; 13. First slide groove; 14. Connecting rod; 15. Operating lever; 16. Tensioning guide wheel; 17. Connecting slider; 18. Second slide groove; 19. Tensioning spring; 20. Hydraulic controller; 21. Upper guide wheel; 22. Storage box; 23. Applying roller; 24. Connecting groove; 25. Filling pipe; 26. Driven gear; 27. Driven gear; 28. Manual pull rope; 29. ​​Return spring; 30. Spring adjusting buckle. Detailed Implementation

[0024] 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.

[0025] Example 1: Please refer to Figures 1-2 To achieve convenient and quick unlocking, this embodiment provides the following technical solution, specifically disclosing an unlocking structure comprising: A traction rope, one end of which is fixedly connected to a first locking member and a first locking groove corresponding to the position of the locking member; the other end of which is fixedly connected to a second locking member and a second locking groove corresponding to the position of the locking member; initially, the first locking member and the first locking groove are engaged, and the second locking member and the second locking groove are engaged, thereby forming a locked state; The pressing part is linked to a pressing component. When unlocking is required, the pressing component is driven to press the traction rope, thereby simultaneously pulling the first locking component out of the first locking slot and the second locking component out of the second locking slot, thus forming an unlocked state. Example 2: Please refer to Figures 1-8 To achieve convenient and quick unlocking, this embodiment provides the following technical solution, specifically disclosing: a left support column 1 and a right support column 2 fixedly installed on the ground; a left lifting assembly 4a and a right lifting assembly 4b respectively installed on the inner side of the left support column 1 and the right support column 2; and support arms 5 rotatably installed on the outer side of both the left lifting assembly 4a and the right lifting assembly 4b; and a hydraulic controller 20 for controlling the internal hydraulic drive structure is fixedly installed on the front side of the left support column 1; the left lifting assembly 4a and the right lifting assembly 4b... A locking assembly 6 is rotatably mounted on the outer side of the upper end of component 4b. The locking assembly 6 includes a locking block 601 and an unlocking block 602 that are rotatably connected to each other. A tension spring 603 is mounted on the outer side of the upper end of the locking block 601, and a fixing plate 7 is fixedly mounted on the inner wall of both the left support column 1 and the right support column 2. The fixing plate 7 has a locking groove 8 inside that engages with and fixes the locking block 601. A traction steel wire rope 11 is connected to the right end of the unlocking block 602. The traction steel wire rope 11 connects the left and right locking assemblies 6 through a linkage mechanism and moves synchronously. The structure includes a left guide wheel 9 rotatably mounted on the inner wall of the lower end of the left support column 1 and a right guide wheel 10 rotatably mounted on the outer side of the right lifting assembly 4b. A traction steel cable 11 is wound around the outside of the left guide wheel 9 and the right guide wheel 10. A control guide wheel 12 and a tension guide wheel 16 are installed on the inner wall of the middle part of the left support column 1, with the control guide wheel 12 and the tension guide wheel 16 facing opposite directions. A first groove 13 and a second groove 18 are formed on the side of the left support column 1, and the control guide wheel 12 slides smoothly between the control guide wheel 12 and the first groove 13. Next, a connecting rod 14 located on the outside of the left support column 1 is installed at the top of the rotating shaft of the control guide wheel 12, and the lower end of the connecting rod 14 is rotatably connected to the operating rod 15, and the top of the operating rod 15 is rotatably connected to the outer surface of the left support column 1. A manual pull rope 28 is installed at the rear end of the unlocking block 602, and the top of the manual pull rope 28 is located at the same point as the traction wire rope 11. A reset spring 29 for driving the traction wire rope 11 to reset is provided on the outside, and a spring adjustment buckle 30 is provided at the upper end of the reset spring 29.

[0026] The unlocking method includes the following: When using the device, firstly, the support arm 5 is lowered to its lowest position using the left lifting assembly 4a and the right lifting assembly 4b. Then, the vehicle is parked above the support arm 5 and in the corresponding support position. Afterward, the operator controls the hydraulic mechanism inside the left support column 1 and the right support column 2 through the hydraulic controller 20. Driven by the hydraulic mechanism, the left lifting assembly 4a and the right lifting assembly 4b move upward, thereby lifting the vehicle. When the vehicle is lifted to the specified height, the locking block 601 on the outer side of the upper end of the left lifting assembly 4a and the right lifting assembly 4b is engaged into the corresponding locking groove 8 opened on the inner side of the fixing plate 7 under the pulling action of the tension spring 603 to form a fixation. After the vehicle is repaired, the operator first pulls down the operating lever 15. At this time, the operating lever 15 rotates downward and pulls the control guide wheel 12 downward through the connecting pull rod 14 (at this time, the control guide wheel 12 slides downward relative to the first slide groove 13). As the guide wheel 12 moves downward, it pulls the traction steel cable 11. At this time, the left end of the traction steel cable 11 pulls the left unlocking block 602 to rotate under the change of direction of the left guide wheel 9. At this time, the unlocking block 602 presses against the inner wall of the left support column 1, squeezing the locking block 601 out of the lock between it and the corresponding locking groove 8. At the same time, the right end of the traction steel cable 11 pulls the right unlocking block 602 to rotate under the change of direction of the right guide wheel 10, thus achieving the purpose of unlocking. During this process, the operator only needs to operate the operating lever 15 once to achieve the purpose of linkage and synchronous unlocking (after unlocking, the elasticity of the return spring 29 is used to reset the traction steel cable 11, thereby resetting the unlocking block 602. The length of the return spring 29 can be adjusted by adjusting the spring force through the spring adjustment buckle 30). The overall unlocking operation is convenient and quick. Finally, the operator can lower the vehicle through the hydraulic controller 20. When a malfunction occurs when operating lever 15, the operator pulls the manual pull ropes 28 on the outside of the left lifting assembly 4a and the right lifting assembly 4b in sequence. After pulling, the operator manually holds the position of the manual pull ropes 28 and operates the hydraulic device. Under the pulling action of the manual pull ropes 28, the unlocking block 602 is rotated, thus achieving the purpose of unlocking. In this way, the redundant design ensures that the device can operate normally. Example 3: Please refer to Figures 9-10 In order to ensure the tension of the unlocking device, this embodiment provides the following technical solution, which specifically discloses that: the tension guide wheel 16 is rotatably connected to the connecting slider 17, and the connecting slider 17 is slidably connected to the second slide groove 18, and a tension spring 19 is fixedly installed between the lower surface of the connecting slider 17 and the inner wall of the second slide groove 18.

[0027] The unlocking method includes the following: During the use of the device, the elastic action of the tension spring 19 is used to push the connecting slider 17 to move upward in the second slide groove 18, thereby using the connecting slider 17 to drive the tension guide wheel 16 to move upward synchronously, and finally using the tension guide wheel 16 to tighten the traction wire rope 11, thereby achieving the purpose of automatic tensioning and preventing the traction wire rope 11 from becoming loose during the up and down movement of the left lifting assembly 4a and the right lifting assembly 4b. Example 4: Please refer to Figures 11-13 In order to achieve the purpose of applying lubricating oil and reducing wear, this embodiment provides the following technical solution, which specifically discloses: a storage box 22 for storing lubricating oil is fixedly installed on the inner side of the upper end of the left support column 1 and the right support column 2, and an application roller 23 is rotatably installed on the outer side of the storage box 22. An upper guide wheel 21 is rotatably installed on the inner side of the upper end of the left support column 1 and the right support column 2. The traction steel wire rope 11 crosses and connects to the cross frame 3 through the upper guide wheel 21. A square-shaped connecting groove 24 is opened on the left side of the storage box 22, and the application roller 23 is inserted into the storage box 22 through the connecting groove 24. The application roller 23 is made of sponge material. The position of the application roller 23 corresponds to the position of the traction steel wire rope 11. A filling pipe 25 connected to the lubricating oil pumping equipment is fixedly installed on the upper part of the storage box 22. A driven gear 26 for driving the application roller 23 is coaxially fixedly installed on the front and rear sides. The driven gear 26 is meshed with the driving gear 27, and the driving gear 27 is coaxially fixedly installed with the upper guide wheel 21.

[0028] Storage boxes 22 are installed on the inner side above the left support column 1 and the right support column 2. The storage boxes 22 contain special lubricating oil for the traction wire rope 11 (lubricating oil can be added to the storage boxes 22 at any time through the filling pipe 25). An applicator roller 23 is set on the outside of the storage boxes 22. One side of the applicator roller 23 is inserted into the storage boxes 22 through the connecting groove 24 and picks up the lubricating oil. The applicator roller 23 applies the lubricating oil to the outside of the traction wire rope 11 (the lubricating oil flows down the traction wire rope 11 under its own gravity to achieve the purpose of comprehensive application). When the traction wire rope 11 is pulled, it drives the upper guide wheel 21 to rotate. During the rotation of the upper guide wheel 21, it drives the drive gear 27 fixedly installed with it to rotate. During the rotation of the drive gear 27, the driven gear 26 meshing with it drives the applicator roller 23 to rotate, so that the applicator roller 23 applies the lubricating oil to the traction wire rope 11 more evenly.

[0029] It is worth noting that the above description is merely illustrative to facilitate understanding of the inventive concept according to this disclosure. Furthermore, although the operations are depicted in a specific order, this should be understood as requiring that such operations be performed in the specific order shown or in sequential order, or requiring that all illustrated operations be performed to achieve the desired result. In certain environments, multitasking and parallel processing may be advantageous. Similarly, although several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of this disclosure. Certain features described in the context of individual embodiments may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented individually or in any suitable sub-combination in multiple implementations.

[0030] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

[0031] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles of the embodiments, their practical application, or improvements to the technology in the market, or to make others in the art...

[0032] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] 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. An unlocking structure characterized by comprising: The unlocking structure comprises a traction rope, one end of the traction rope is fixedly connected with a first clamping piece, a first clamping groove corresponding to the position of the clamping piece is arranged, the other end of the traction rope is fixedly connected with a second clamping piece, a second clamping groove corresponding to the position of the clamping piece is arranged, initially, the first clamping piece and the first clamping groove are clamped, the second clamping piece and the second clamping groove are clamped, thereby forming a locking state; A pressing part is arranged in linkage with a pressing piece, when unlocking is needed, the pressing piece is driven to press the traction rope, thereby synchronously pulling the first clamping piece to be separated from the first clamping groove and the second clamping piece to be separated from the second clamping groove, thereby forming an unlocking state. The unlocking structure is applied to the locking and unlocking of the vertical movement of the support arm of the column type lifting machine.

2. An unlocking structure according to claim 1, characterized in that:

3. The unlocking structure according to claim 2, characterized in that: The traction rope is a traction steel wire rope (11); The first clamping piece is a lock catch assembly (6) rotatably arranged at the upper end of the left lifting assembly (4a), and the second clamping piece is a lock catch assembly (6) rotatably arranged at the upper end of the right lifting assembly (4b); The lock catch assembly (6) comprises a locking block (601) and an unlocking block (602) rotatably connected with each other, a tension spring (603) is arranged at the upper end of the locking block (601), the right end of the unlocking block (602) is connected with the traction steel wire rope (11), and the traction steel wire rope (11) is connected with and synchronously moves the left and right two lock catch assemblies (6) through a linkage mechanism. Further, a fixed plate (7) is fixedly arranged on the inner wall of the left support column (1) and the right support column (2), a locking groove (8) for clamping and fixing the locking block (601) is arranged in the fixed plate (7), and the first clamping groove and the second clamping groove are the locking groove (8).

4. An unlocking structure according to claim 3, wherein: The linkage mechanism comprises a left guide wheel (9) rotatably arranged on the lower end of the left support column (1) and a right guide wheel (10) rotatably arranged on the outer side of the right lifting assembly (4b), and the traction steel wire rope (11) is wound around the outer sides of the left guide wheel (9) and the right guide wheel (10).

5. An unlocking structure according to claim 4, wherein: Further, a control guide wheel (12) and a tension guide wheel (16) are arranged, and the directions of the control guide wheel (12) and the tension guide wheel (16) are opposite.

6. An unlocking structure according to claim 5, wherein: The pressing part comprises a connecting pull rod (14) arranged at the top end of the rotating shaft of the control guide wheel (12), the lower end of the connecting pull rod (14) is rotatably connected with an operating rod (15), and the pressing piece is the right guide wheel (10).

7. An unlocking structure according to claim 6, wherein: A first sliding groove (13) and a second sliding groove (18) are arranged on the side of the left support column (1), the control guide wheel (12) is slidably connected with the first sliding groove (13), the tension guide wheel (16) is rotatably connected with a connecting sliding block (17), the connecting sliding block (17) is slidably connected with the second sliding groove (18), and a tension spring (19) is fixedly arranged between the lower surface of the connecting sliding block (17) and the inner wall of the second sliding groove (18).

8. An unlocking structure according to claim 6, wherein: A manual pull rope (28) is arranged at the rear end of the unlocking block (602), and the top end of the manual pull rope (28) is located at the same point as the traction steel wire rope (11).

9. The unlocking structure of claim 3, wherein: ​ 10. An unlocking structure according to claim 9, wherein: The traction steel wire rope (11) is externally provided with a reset spring (29) for driving the reset of the traction steel wire rope (11), and the upper end of the reset spring (29) is provided with a spring adjusting buckle (30).

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