Locking structure and lifting platform

Abstract

The utility model belongs to the technical field of machining equipment, and discloses a locking structure and a lifting platform, and the locking structure comprises a rack and a locking assembly. The locking assembly comprises a driving piece and a locking piece, the output end of the driving piece is fixedly connected with the locking piece, the driving piece can drive the locking piece to move so that the locking piece can have a locking position capable of preventing the connecting shaft from moving and an unlocking position capable of avoiding the connecting shaft and enabling the connecting shaft to move, and therefore the connecting shaft moving in the first direction is locked. According to the lifting platform, by applying the locking structure, the stopping precision of a specific position in the working stroke of the working medium cylinder can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of processing equipment, in particular to a locking structure and a lifting platform. Background Art

[0002] A working fluid cylinder is a drive device that uses gas, liquid, or solid as a working medium to move its cylinder rod through a fixed stroke. As the power element of process equipment with precise displacement requirements, such as adhesive machines, laminators, and riveters, the control accuracy of the cylinder rod's travel directly affects the functionality of the products produced by these machines.

[0003] Taking a gluing machine with a lifting function as an example, for two parts that need to be glued together, it is often necessary to place one part on the workbench, and then use the working fluid cylinder to drive the lifting platform to move, stop at a specific position of the cylinder rod of the working fluid cylinder, and clamp the other part on the lifting platform. The gluing mechanism of the gluing machine applies colloid to the part clamped on the lifting platform, and then the cylinder rod of the working fluid cylinder moves to the full stroke, and the part clamped on the lifting platform applies pressure to the part on the workbench, so as to ensure that the adhesion strength between the two parts meets the process requirements. If the stop position accuracy of the cylinder rod of the working fluid cylinder at a specific position is not enough, the gluing mechanism will not be able to apply an appropriate amount of colloid to the parts. Due to the fact that the working medium is difficult to control, the cylinder rod of the working fluid cylinder can only ensure the stopping position accuracy of the cylinder rod when working at full stroke. If the cylinder rod needs to stop at a specific position in its moving stroke, the stopping position accuracy of the cylinder rod at a specific position cannot be guaranteed.

[0004] Due to the particularity of the working principle of the viscose machine lifting platform, if the working cylinder cannot accurately extend the cylinder rod to a specific position, the adhesion strength between the two parts will not meet the process requirements, resulting in defective products. Utility Model Content

[0005] The purpose of the utility model is to provide a locking structure and a lifting platform, which can improve the stopping accuracy of a specific position in the working stroke of a working medium cylinder to ensure the processing quality of the product.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] In a first aspect, a locking structure is provided, the locking structure comprising:

[0008] A connecting shaft, the connecting shaft being movable along a first direction;

[0009] The locking assembly includes a driving member and a locking member, wherein an output end of the driving member is connected to the locking member and is capable of driving the locking member to move so that the locking member has a locked position capable of preventing the connecting shaft from moving and an unlocked position capable of avoiding the connecting shaft and allowing the connecting shaft to move;

[0010] A limiting piece is sleeved on the connecting shaft; a first through hole and a second through hole are provided on the locking piece, the first through hole can only allow the connecting shaft to pass through, and the second through hole can allow the connecting shaft and the limiting piece to pass through together. When the locking piece is in the locked position, the first through hole is coaxial with the connecting shaft, and when the locking piece is in the unlocked position, the second through hole is coaxial with the connecting shaft.

[0011] Preferably, the inner diameters of the first through hole and the second through hole are both larger than the outer diameter of the connecting shaft; the outer diameter of the limiting member is larger than the inner diameter of the first through hole, and the outer diameter of the limiting member is smaller than the inner diameter of the second through hole.

[0012] Preferably, the limiting member is arranged on the connecting shaft in an adjustable manner along the first direction.

[0013] Preferably, the locking structure further includes a fixing member, and the limiting member is locked on the connecting shaft through the fixing member.

[0014] Preferably, a buffer member is provided on a side of the limiting member facing the locking member.

[0015] Preferably, the locking assembly further comprises a locking piece sleeve, which is sleeved on the outside of the locking piece and has a through slot for the locking piece to move, and the driving piece can drive the locking piece to move in the through slot.

[0016] In the second aspect, a lifting platform is provided, including a frame, a working fluid cylinder, a lifting plate and the above-mentioned locking structure; the working fluid cylinder includes a cylinder body and a cylinder rod telescopically connected to the cylinder body, the cylinder body is fixed to the frame, and the cylinder rod is connected to the lifting plate; the locking assembly is arranged on the frame, and the connecting shaft of the locking structure is connected to the lifting plate.

[0017] Preferably, the lifting platform also includes a first preset position detection component, which is fixed to the locking component and is communicatively connected to the working fluid cylinder. When the limiting component is lifted to the height of the first preset position detection component, the first preset position detection component can be triggered by the limiting component.

[0018] Preferably, there are multiple locking structures, and the multiple locking structures are arranged at intervals along the circumference of the lifting plate.

[0019] Preferably, the setting position of the locking assembly on the frame is adjustable.

[0020] Beneficial effects of the utility model:

[0021] The locking structure provided by the utility model comprises a locking assembly including a driving member and a locking member, wherein the output end of the driving member is fixedly connected to the locking member, and the driving member can drive the locking member to move so that the locking member has a locking position and an unlocking position. When the locking member is in the locking position, the locking member can prevent the connecting shaft from moving. When the locking member is in the unlocking position, the locking member avoids the connecting shaft and enables the connecting shaft to move, thereby finally enabling the locking member to lock the connecting shaft moving along the first direction.

[0022] The utility model also provides a lifting platform, which can improve the stopping accuracy of a specific position in the working stroke of the working fluid cylinder by applying the above-mentioned locking structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of the lifting platform provided by the utility model;

[0024] Figure 2 yes Figure 1 Schematic diagram of the structure after the rack is hidden;

[0025] Figure 3 It is a structural schematic diagram of the locking structure provided by the utility model;

[0026] Figure 4 It is a structural diagram of the locking assembly provided by the utility model;

[0027] Figure 5 yes Figure 4 Cross-sectional view at AA.

[0028] In the picture:

[0029] 1. Connecting shaft;

[0030] 2. Locking assembly; 21. Driving member; 22. Locking member; 221. Through hole; 2211. First through hole; 2212. Second through hole; 23. Locking member sleeve; 231. Through slot;

[0031] 31. Limiting member; 32. Buffering member; 33. Fixing member;

[0032] 4. Rack;

[0033] 5. Working medium cylinder; 51. Cylinder body; 52. Cylinder rod;

[0034] 6. Lifting plate. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0036] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, terms such as "upper," "lower," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0039] Figure 1 FIG. 1 shows a schematic structural diagram of the lifting platform provided in this embodiment. Figure 2 Shown Figure 1 The structural diagram after hiding the rack 4 is as follows: Figures 1 to 2As shown, this embodiment provides a lifting platform, which is used in a glue machine. The lifting platform includes a frame 4, a working fluid cylinder 5 and a lifting plate 6. The working fluid cylinder 5 includes a cylinder body 51 and a cylinder rod 52 that is retractably connected to the cylinder body 51. The cylinder body 51 is fixed to the frame 4, and the cylinder rod 52 is connected to the lifting plate 6. The steps for using the glue machine are as follows: first, place the first workpiece on the workbench of the glue machine (not shown in the figure); start the working fluid cylinder 5 to drive the lifting plate 6 connected to the cylinder rod 52 to move to a first preset position, and then place the second workpiece on the lifting plate 6; the glue dispensing mechanism of the glue machine (not shown in the figure) performs a glue dispensing operation on the second workpiece placed on the lifting plate 6; start the working fluid cylinder 5 to drive the lifting plate 6 connected to the cylinder rod 52 to move to a second preset position. At this time, the first workpiece and the second workpiece are in contact with each other, and the second workpiece can apply pressure to the first workpiece under the driving action of the working fluid cylinder 5, so that the first workpiece and the second workpiece are adhered.

[0040] It should be noted that, in actual operation, the first preset position of the lifting plate 6 is located between the initial position of the lifting plate 6 and the second preset position, and the second preset position is the position to which the cylinder rod 52 of the working fluid cylinder 5 can drive the lifting plate 6 when the lifting plate 6 is fully traveled. However, due to the difficulty in controlling the working medium in the working fluid cylinder 5, the stopping position accuracy of the cylinder rod 52 of the working fluid cylinder 5 can only be guaranteed when the cylinder rod 52 is operating at full travel. If the cylinder rod 52 is required to stop at a specific position during its travel, the stopping position accuracy cannot be guaranteed. In other words, the lifting plate 6 can stop accurately at the second preset position, but the stopping accuracy at the first preset position is not high. If the lifting plate 6 cannot stop accurately at the first preset position, the position of the glue dispensing mechanism of the glue machine relative to the second workpiece in the second preset position cannot be guaranteed for each glue dispensing operation. It is also impossible to ensure that the amount of glue dispensed by the glue dispensing mechanism on the second workpiece is the same each time. As a result, the amount of glue on the second workpiece may not meet the required usage, which will affect the glue dispensing effect on the second workpiece, and further lead to poor adhesion between the first and second workpieces, affecting the quality of the finished product.

[0041] Figure 3 : shows a schematic structural diagram of the locking structure provided in this embodiment, Figure 4 FIG. 2 shows a schematic structural diagram of the locking assembly 2 provided in this embodiment. Figure 5 Shown Figure 4 The cross-sectional view at AA. Figures 1 to 5As shown, a stopper 31 is sleeved on the connecting shaft 1, and a first through-hole 2211 and a second through-hole 2212 are provided on the locking member 22. The first through-hole 2211 is only for the connecting shaft 1 to pass through, while the second through-hole 2212 is for the connecting shaft 1 and the stopper 31 to pass through together. When the locking member 22 is in the locked position, the connecting shaft 1 is coaxial with the first through-hole 2211, and the stopper 31 cannot pass through the first through-hole 2211, thereby allowing the connecting shaft 1 to stop when the stopper 31 contacts the locking member 22. When the locking member 22 is in the unlocked position, the connecting shaft 1 is coaxial with the second through-hole 2212, and the stopper 31 can pass through the second through-hole 2212, allowing the connecting shaft 1 to continue to move in the first direction. The axial direction of the connecting shaft 1 is the first direction, and the first direction is parallel to the extension and retraction direction of the cylinder rod 52. The first through hole 2211 on the locking member 22 blocks the limiting member 31 from passing through, so that the connecting shaft 1 is locked by the locking member 22 during the process of moving along the first direction.

[0042] Specifically, the inner diameters of the connecting shaft 1 and the first and second through holes 2211, 2212 are all larger than the outer diameter of the connecting shaft 1, such that the projected area of the connecting shaft 1 in the first direction is smaller than the first and second through holes 2211, 2212, allowing the connecting shaft 1 to pass normally through the first and second through holes 2211, 2212 when moving in the first direction. The outer diameter of the stopper 31 is larger than the inner diameter of the first through hole 2211, such that the projected area of the stopper 31 in the first direction is larger than the first through hole 2211, preventing the stopper 31 from passing through the first through hole 2211 when moving in the first direction. The outer diameter of the stopper 31 is smaller than the inner diameter of the second through hole 2212, such that the projected area of the stopper 31 in the first direction is smaller than the second through hole 2212, allowing the stopper 31 to pass through the second through hole 2212 when moving in the first direction.

[0043] When the locking structure is applied to a lifting platform, the locking assembly 2 can be set on the frame 4, and the connecting shaft 1 can be fixedly connected to the lifting plate 6. When the working cylinder 5 drives the lifting plate 6 to move, it can drive the connecting shaft 1 to move synchronously. The driving member 21 drives the locking member 22 to switch to the locking position. When the lifting plate 6 moves to the first preset position, the movement of the connecting shaft 1 is locked, so that the lifting plate 6 stops at the first preset position, ensuring the stopping accuracy of the lifting plate 6. When the lifting plate 6 needs to move in the first direction, the driving member 21 drives the locking member 22 to switch to the unlocking position. At this time, the lifting plate 6 and the connecting shaft 1 can both move smoothly in the first direction.

[0044] In some embodiments, the locking member 22 has a through hole 221 through which the connecting shaft 1 passes. The through hole 221 is loosely fitted with the connecting shaft 1. The driving member 21 can drive the locking member 22 to move, causing the inner wall of the through hole 221 to contact the connecting shaft 1 to prevent its movement or to avoid the connecting shaft 1 to allow the connecting shaft 1 to pass through. Therefore, the stopper 31 is no longer required, simplifying the structure. In other words, when the locking member 22 is in the locked position, the connecting shaft 1 contacts the wall of the through hole 221, and the friction between the wall of the through hole 221 and the connecting shaft 1 prevents the connecting shaft 1 from moving further. When the locking member 22 is in the unlocked position, a gap exists between the connecting shaft 1 and the wall of the through hole 221, ensuring that the connecting shaft 1 can move smoothly in the first direction.

[0045] It is worth noting that the driving member 21 can adopt a cylinder, a motor or an oil cylinder, which can drive the locking member 22 to move within a specific range, so that it can switch repeatedly between the locked position and the unlocked position. All driving members 21 that can move the locking member 22 within a specific range and switch repeatedly between the locked position and the unlocked position are within the scope of protection of this application. The specific type of the driving member 21 is a relatively common driving member in this field and will not be described one by one here.

[0046] like Figure 3 As shown, in this embodiment, the stopper 31 is detachably connected to the connecting shaft 1. The stopper 31 is adjustable along the first direction on the connecting shaft 1, thereby controlling the travel of the connecting shaft 1 to reach a specific stop position and changing the specific stop position of the connecting shaft 1. Specifically, the connecting shaft 1 is an optical shaft with an external thread, and the stopper 31 is a nut that is threadedly engaged with the connecting shaft 1. When the connecting shaft 1 moves in the first direction, the stopper 31 collides with the outer surface of the locking member 22, causing the connecting shaft 1 to stop moving in the first direction. Of course, in other embodiments, the stopper 31 can also be a stopper protrusion structure integrally formed on the connecting shaft 1, which can also achieve the above-mentioned effect.

[0047] However, after the locking member 22 collides with the limiting member 31, the limiting member 31 will inevitably loosen, causing its fixed position relative to the connecting shaft 1 to change, thereby reducing the stopping accuracy of the connecting shaft 1 at a specific position. To solve the above problem, the locking structure also includes a fixing member 33. The limiting member 31 is locked to the connecting shaft 1 by the fixing member 33, so that after the locking member 22 moves along the first direction and contacts the limiting member 31, the limiting member 31 can remain relatively stationary relative to the connecting shaft 1. Specifically, the limiting member 31 is a locking nut that is threadedly connected to the connecting shaft 1 and is arranged on the side of the limiting member 31 away from the locking member 22. The locking nut is self-locking, preventing the limiting member 31 from sliding relative to the connecting shaft 1 due to impact, thereby maintaining the stopping accuracy of the connecting shaft 1 at a specific position.

[0048] Furthermore, the locking structure also includes a buffer member 32, which is arranged on the side of the limit member 31 facing the locking member 22. The buffer member 32 is arranged in contact with the limit member 31, so that when the connecting shaft 1 moves along the first direction, the locking member 22 first contacts the buffer member 32, thereby preventing the limit member 31 from being worn due to long-term impact. At the same time, the buffer member 32 can also absorb part of the impact potential energy generated by the limit member 31 colliding with the locking member 22, thereby reducing the impact potential energy transmitted to the driving member 21 and preventing damage to the driving member 21.

[0049] It can be understood that the buffer part 32 belongs to the existing technology and can be made of nylon, polyformaldehyde, bakelite, etc. All plastic materials that can absorb the impact potential energy generated by the locking part 22 hitting the limit part 31 are within the scope of protection of this application. The specific type and structure of the buffer part 32 are relatively common plastic materials and structures in this field. The specific material of any existing plastic material can achieve the purpose of this application to reduce the impact strength of the limit part 31.

[0050] After using the locking structure for a long time, the displacement stroke of the locking member 22 will always be offset, resulting in the locking member 22 being in the unlocked position, but the connecting shaft 1 and the locking member 22 are interfering with each other, making the locking structure unable to be used normally. Figure 3 As shown, the locking assembly 2 also includes a locking piece sleeve 23, which is sleeved on the outside of the locking piece 22. The locking piece sleeve 23 has a through slot 231 for the locking piece 22 to move. The driving piece 21 can drive the locking piece 22 to move in the through slot 231, and the through slot 231 can correct the moving direction of the locking piece 22.

[0051] like Figures 1 to 3 As shown, the number of connecting shafts 1 can be more than one, and the specific number is not limited. The number of locking assemblies 2 is the same as the number of connecting shafts 1, and the connecting shafts 1 and the locking assemblies 2 are installed correspondingly, so that multiple locking structures can be used to lock the cylinder rod 52. That is, the number of locking structures can be multiple, and the multiple locking structures are arranged at intervals along the circumference of the lifting plate 6. If one of the locking assemblies 2 fails, the other locking assemblies 2 can also play the role of locking the lifting plate 6, thereby improving the specific stopping position accuracy of the lifting plate 6. In other embodiments, the connecting shaft 1 can also be omitted, and the cylinder rod 52 can be used as the connecting shaft 1; that is, the locking structure is set at a position near the working fluid cylinder 5 on the frame 4, and the cylinder rod 52 is set through the through hole 221. The cylinder rod 52 and the through hole 221 are clearance-matched, and the locking assembly 2 directly prevents the cylinder rod 52 from moving at a specific position.

[0052] Optionally, the setting position of the locking assembly 2 on the frame 4 is adjustable, as long as the locking member 22 can prevent the connecting shaft 1 from moving along the first direction at a specific position. Therefore, the locking assembly 2 can be installed on the frame 4 according to actual needs, so that the locking assembly 2 can adjust the installation position according to actual needs, so as to facilitate the modification of existing equipment that does not have the locking assembly 2 installed, thereby improving the adaptability of the locking structure.

[0053] For ease of description, Figure 1 As shown, the movement of the cylinder rod 52 in the extension direction is a forward movement, and the movement of the cylinder rod 52 in the retraction direction is a reverse movement.

[0054] The lifting platform provided in this embodiment also includes a controller. The working cylinder 5 and the driving member 21 are respectively communicatively connected to the controller. The controller is capable of issuing a first signal to control the forward movement of the cylinder rod 52 of the working cylinder 5, a second signal to control the switching of the driving member 21 between a locked position and an unlocked position, and a third signal to control the reverse movement of the cylinder rod 52 of the working cylinder 5. When the working cylinder 5 receives the first signal from the controller, it is capable of driving the cylinder rod 52 to move forward in a first direction, thereby causing the lifting plate 6 to move. When the driving member 21 receives the second signal from the controller, it is capable of driving the locking member 22 to switch between an unlocked position and a locked position. When the working cylinder 5 receives the third signal from the controller, it is capable of driving the cylinder rod 52 to move reversely in the first direction, thereby causing the lifting plate 6 to move. Specifically, when the cylinder rod 52 moves forward in the first direction, it drives the lifting plate 6 to move forward; when the cylinder rod 52 moves reversely in the first direction, it drives the lifting plate 6 to move reversely.

[0055] The lifting platform provided in this embodiment also includes a first preset position detection component, which is in communication connection with the working fluid cylinder 51. The first preset position detection component is fixed to the locking component 22 and can be triggered by the limiting component 31 when the locking component 22 prevents the limiting component 31 from passing through. Therefore, the first preset position detection component can send a fourth signal to stop the working fluid cylinder 5 from driving its cylinder rod 52, thereby preventing the connecting shaft 1 from continuously applying pressure to the locking component 22 and crushing the locking component 22, thereby increasing the service life of the locking component 22. It is worth noting that in order to prevent the first preset position detection component from being mistakenly triggered by the cylinder rod 52 before the lifting plate 6 moves to the first preset position, the first preset position detection component is preferably a magnetic switch, so that the limiting component 31 with a larger projected area along the first direction can trigger the first preset position detection component, while the cylinder rod 52 with a smaller projected area along the first direction than the limiting component 31 will not trigger the first preset position detection component.

[0056] In some embodiments, when the limit member 31 is lifted or lowered to the height of the first preset position detection member, the first preset position detection member can be triggered by the limit member 31, so that the first preset position detection member can send a fourth signal to stop the working fluid cylinder 5 from driving its cylinder rod 52, and utilize the inertia of the cylinder rod 52 moving along the first direction to move the lifting plate 6 to the first preset position, thereby reducing the impact strength of the limit member 31 on the locking member 22, thereby improving the service life of the locking member 22.

[0057] This embodiment further provides a control method for a lifting platform. Taking a locking structure as an example, the control method for the lifting platform provided by this embodiment is described:

[0058] S100: The controller sends a second signal, and the driving member 21 drives the locking member 22 to move to the locking position.

[0059] S200: The controller sends a first signal, and the cylinder rod 52 of the working medium cylinder 5 starts to move forward in a first direction to drive the lifting plate 6 to move downward.

[0060] S300 , when the locking member 22 conflicts with the limiting member 31 , the first preset position detecting member is triggered, the first preset position detecting member sends a fourth signal, and the cylinder rod 52 stops moving.

[0061] S400: The controller sends a second signal again, and the driving member 21 drives the locking member 22 to move to the unlocking position.

[0062] S500: The controller sends the first signal again, and the cylinder rod 52 of the working medium cylinder 5 starts to move forward in the first direction to the full stroke position and then stops.

[0063] S600: The controller sends a third signal, and the cylinder rod 52 of the working medium cylinder 5 starts to move in the opposite direction along the first direction to the zero stroke position and then stops.

[0064] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the implementation methods of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A locking structure, characterized in that: The locking structure comprises: A connecting shaft (1), wherein the connecting shaft (1) is movable along a first direction; A locking assembly (2) comprising a driving member (21) and a locking member (22), wherein an output end of the driving member (21) is connected to the locking member (22) and is capable of driving the locking member (22) to move, so that the locking member (22) has a locking position capable of preventing the connecting shaft (1) from moving and an unlocking position capable of avoiding the connecting shaft (1) and allowing the connecting shaft (1) to move; A limiting member (31) is sleeved on the connecting shaft (1); a first through hole (2211) and a second through hole (2212) are provided on the locking member (22), wherein the first through hole (2211) can only allow the connecting shaft (1) to pass through, and the second through hole (2212) can allow the connecting shaft (1) and the limiting member (31) to pass through together; when the locking member (22) is in the locking position, the first through hole (2211) is coaxial with the connecting shaft (1); when the locking member (22) is in the unlocking position, the second through hole (2212) is coaxial with the connecting shaft (1).

2. The locking structure according to claim 1, characterized in that: The inner diameters of the first through hole (2211) and the second through hole (2212) are both larger than the outer diameter of the connecting shaft (1); the outer diameter of the limiting member (31) is larger than the inner diameter of the first through hole (2211), and the outer diameter of the limiting member (31) is smaller than the inner diameter of the second through hole (2212).

3. The locking structure according to claim 1, characterized in that: The position-limiting member (31) is arranged on the connecting shaft (1) in an adjustable manner along the first direction.

4. The locking structure according to claim 3, characterized in that: The locking structure further comprises a fixing member (33), and the limiting member (31) is locked on the connecting shaft (1) via the fixing member (33).

5. The locking structure according to claim 1, characterized in that: A buffer member (32) is provided on one side of the limiting member (31) facing the locking member (22).

6. The locking structure according to claim 1, characterized in that: The locking assembly (2) further comprises a locking piece sleeve (23), the locking piece sleeve (23) being sleeved outside the locking piece (22), the locking piece sleeve (23) having a through slot (231) for the locking piece (22) to move, and the driving piece (21) being capable of driving the locking piece (22) to move in the through slot (231).

7. A lifting platform, characterized in that: It comprises a frame (4), a working fluid cylinder (5), a lifting plate (6) and a locking structure according to any one of claims 1 to 6; the working fluid cylinder (5) comprises a cylinder body (51) and a cylinder rod (52) telescopically connected to the cylinder body (51), the cylinder body (51) is fixed to the frame (4), and the cylinder rod (52) is connected to the lifting plate (6); the locking assembly (2) is arranged on the frame (4), and the connecting shaft (1) of the locking structure is connected to the lifting plate (6).

8. The lifting platform according to claim 7, characterized in that: The lifting platform further comprises a first preset position detection member, which is fixed to the locking member (22) and is communicatively connected to the working fluid cylinder (5). When the limiting member (31) is lifted or lowered to the height at which the first preset position detection member is located, the first preset position detection member can be triggered by the limiting member (31).

9. The lifting platform according to claim 7, characterized in that: There are multiple locking structures, and the multiple locking structures are arranged at intervals along the circumference of the lifting plate (6).

10. The lifting platform according to claim 8, characterized in that: The setting position of the locking component (2) on the frame (4) is adjustable.

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