Platform lifting and moving mechanism

Abstract

The utility model discloses a platform lifting and moving mechanism capable of keeping a bearing and moving state of a platform, which comprises a lifting main body, a lifting mechanism, a lifting mechanism, a lifting mechanism and a lifting mechanism, and is characterized in that the lifting main body is provided with a parallel four-connecting-rod structure and a rolling piece; the handle assembly is connected with the lifting main body; the handle assembly can be operated to enable the rolling piece to ascend or descend through the parallel four-connecting-rod structure. The front end of the handle assembly is further fixedly connected with a locking piece. The upper end of the locking piece is fixedly connected with the handle assembly, and the lower end of the locking piece is provided with a hooking part; when the platform lifting and moving mechanism is in a working state of movably bearing the platform, the locking piece is in contact with the front end of the step and is stopped; in the working state, the handle assembly is allowed to be pulled forwards by a preset distance, so that the hooking part is moved out from the lower part of the step to an unshielded unlocking state; and when the hooking part is in the unlocking state, the handle assembly is allowed to controllably rotate upwards.

Description

Technical Field

[0001] The utility model relates to an auxiliary lifting mechanism, in particular to a platform lifting and moving mechanism. Background Art

[0002] Modular platforms are used in many climbing scenarios, but they are basically fixed, mainly because they are large in size and heavy in weight, making them difficult to lift.

[0003] To solve this problem, the utility model patent with announcement number CN217297113U discloses a mechanism for platform lifting control and a lifting platform, which utilizes a parallel four-bar structure and a handle to assist manual lifting and transfer operations of the modular platform. However, during use, it was found that the lifting state of the mechanism was often mistakenly eliminated during the transfer process, which not only affected the operation progress but also easily caused safety accidents.

[0004] In addition, when the lifting and lowering operation is performed by the handle, the moving wheels on both sides are prone to asynchronous lifting and lowering, which affects the moving efficiency and easily causes safety problems such as tilting. Utility Model Content

[0005] The inventors have found that although the existing lifting mechanism is also provided with a locking plate, the locking plate itself is movably arranged on the pull rod assembly, and the movable connection method causes the locking plate itself to be not firmly fixed in position, and thus it is easy to lose its position, resulting in the release of the lifting state; further research has found that the misunderstanding of the lifting state usually occurs when the ground is uneven or when passing by obstacles such as cables. This is because the obstacles will give the universal wheel a certain degree of obstructive force, and this force can just cause the base to lift, thereby transmitting it to the handle assembly, causing the handle assembly to unlock and retreat, and when passing by an obstacle, the entire structure will vibrate to a certain extent, and this vibration will be transmitted to the handle assembly, causing the locking plate thereon to also move up unexpectedly. Once this upward movement occurs, even if it is slight, the current stable state will be quickly broken due to the excessive weight of the platform, and the handle assembly will quickly retreat, resulting in the lifting being released and the platform quickly landing.

[0006] Furthermore, the armrest of the existing lifting mechanism uses two connecting rods on the left and right sides to connect the lifting base below, and the two connecting rods are independent of each other. Therefore, when lifting or lowering, it is difficult to ensure complete synchronization of the left and right sides due to the heavy weight of the platform.

[0007] In order to solve at least one of the above problems, the utility model adopts the following technical solutions:

[0008] A platform lifting and moving mechanism, the platform includes multiple steps; the platform lifting and moving mechanism includes:

[0009] A lifting body used for fixedly connecting the platform, which is provided with a parallel four-link structure and a rolling element;

[0010] A handle assembly connected to the lifting body; the handle assembly can be manipulated to lift or lower the rolling element through the parallel four-bar linkage structure; wherein the front end of the handle assembly is also fixedly connected to a locking element; the upper end of the locking element is fixedly connected to the handle assembly, and the lower end is provided with a hooking portion;

[0011] Wherein, when the platform lifting and moving mechanism is in a working state of movably carrying the platform, the locking piece contacts the front end of the step and is stopped, and the hook portion is located below the front end of the step; in this working state, the handle assembly is allowed to be pulled forward a predetermined distance so that the hook portion moves out from under the step to an unlocked state that is not blocked; when the hook portion is in the unlocked state, the handle assembly is allowed to be manipulated to rotate upward.

[0012] As one aspect of the present application, the locking member includes a locking plate; the hooking portion is an inner hook body arranged at the lower end of the locking plate; the locking plate and the inner hook body are an integrally formed structure; the upper end of the locking plate is welded and connected to the handle assembly.

[0013] As one aspect of the present application, the locking plate is fixedly connected to the bottom of the handle assembly in an inwardly inclined manner; the narrow surface of the locking plate faces the step; the hook body extends obliquely inward and upward at the lower end of the locking plate, forming a concave groove between the locking plate and the locking plate.

[0014] As one aspect of the present application, the lifting body includes: a platform connecting frame for fixing the connecting platform and a lifting base frame connected in parallel to the bottom of the platform connecting frame; the rolling member is arranged on the lifting base frame; the handle assembly is connected to the lifting body through a connecting rod; the rear end of the handle assembly is rotatably connected to the upper end of the connecting rod; the rotatable angle range of the handle assembly relative to the connecting rod is greater than 90 degrees.

[0015] As one aspect of the present application, when the platform lifting and moving mechanism is in a working state of movably carrying the platform, the connecting rod and the rear end of the step are spaced apart by a predetermined distance; the predetermined distance is the maximum distance the handle assembly is allowed to be pulled forward in the working state.

[0016] As one aspect of the present application, when the handle assembly is in the working state, an angle between the connecting rod and the plane where the platform connecting frame is located is greater than 60 degrees and less than 90 degrees.

[0017] As one aspect of the present application, when the handle assembly moves to the unlocked state, the angle between the connecting rod and the plane where the platform connecting frame is located is less than or equal to 90 degrees and greater than the angle of the connecting rod in the working state.

[0018] As one aspect of the present application, two connecting rods are arranged in parallel and are rotatably connected to two rear ends of the handle assembly respectively;

[0019] The platform lifting and moving mechanism is also provided with a reinforcing connecting rod; the two ends of the reinforcing connecting rod are respectively and vertically fixedly connected to the two connecting rods.

[0020] As one aspect of the present application, a plurality of reinforcing connecting rods are fixedly connected in parallel between two connecting rods.

[0021] As one aspect of the present application, the platform lifting and moving mechanism is also provided with a limit member; the limit member is configured to ensure that the angle between the connecting rod and the plane where the platform connecting frame is located does not exceed 90 degrees.

[0022] Beneficial Effects

[0023] The platform lifting and moving mechanism utilizes the platform's own gravity to maintain its lifted and unlocked state; even if the handle assembly tends to retreat due to obstacles or uneven roads during walking, the handle assembly can be maintained in the working position due to the presence of the hook portion, and unexpected displacement will not occur, thereby maintaining the load-bearing and moving state of the platform.

[0024] With reference to the following description and the accompanying drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope.

[0025] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0026] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 This is a three-dimensional structural diagram of a platform lifting and moving mechanism of an embodiment of the utility model;

[0029] Figure 2 yes Figure 1 Another view of;

[0030] Figure 3 yes Figure 1 Side view of

[0031] Figure 4 yes Figure 1 A magnified view of the X portion;

[0032] Figure 5 yes Figure 3 A magnified view of the Y portion;

[0033] Figure 6 Is adopted Figure 1 Three-dimensional structural diagram of the raised platform;

[0034] Figure 7 yes Figure 6 Another view of;

[0035] Figure 8 yes Figure 6 A magnified view of the Z part;

[0036] Fig. 9 It is a structural schematic diagram of the platform lifting and moving mechanism in a working state (state A);

[0037] Fig.10 yes Fig. 9 A partial enlarged view of

[0038] Fig.11 It is a schematic diagram of the platform lifting movement mechanism switching from the unlocking state (B state) to the unlocking completion state (C state);

[0039] Fig.12 It is a schematic diagram of the connecting rod of the platform lifting and moving mechanism being in a lying state;

[0040] Fig.13 It is a structural diagram of a platform lifting and moving mechanism according to another embodiment of the utility model. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0042] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be another element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be another element centered thereon at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0043] It should be understood that "installed", "connected", "connected", and "coupled" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal communication of two elements. However, if other words can achieve the same purpose, the words can be replaced by other expressions.

[0044] It should be noted that modular platforms (such as large herringbone ladders, moon-shaped ladders, modular scaffolding, etc.) are used in many climbing scenes. Workers need to stand on the large platform to work, so the large platform is basically fixed. The modular platform is large in size and heavy in weight, and it is difficult to be lifted to change its height. The embodiment of the present application provides a mechanism for platform lifting control, which is used to be assembled on the large platform, so that the large platform can be lifted upward to adjust the height of the platform.

[0045] The following will be combined Figure 1-Figure 13 The platform lifting and moving mechanism 100 involved in the embodiment of the present application is described in detail. It should be noted that the following embodiments are only used to explain the present application and do not constitute a limitation on the present application.

[0046] like Figures 1 to 12 An embodiment of the utility model provides a platform lifting and moving mechanism 100, wherein the platform includes a multi-step 201. The platform lifting and moving mechanism 100 includes: a lifting body connected to the platform, which is provided with a parallel four-bar linkage structure; and a handle assembly 1 connected to the lifting body through a connecting rod 4. The handle assembly 1 can be manipulated to lift or lower the platform through the parallel four-bar linkage structure.

[0047] The lifting body includes: a platform connecting frame 5a for fixing the platform and a lifting frame 5b connected in parallel to the platform connecting frame 5a. The lifting frame 5b is connected to the platform connecting frame 5a through a parallel four-bar linkage structure, and moves up and down relative to the platform connecting frame 5a by means of the parallel four-bar linkage structure; the lifting frame 5b is also provided with a rolling element.

[0048] The handle assembly 1 is connected to the parallel four-bar linkage structure through the connecting rod 4, and can use the parallel four-bar linkage structure to drive the lifting frame 5b to move up and down relative to the platform connecting frame 5a, thereby raising or lowering the platform. The rear end of the handle assembly 1 is rotatably connected to the upper end of the connecting rod 4. The front end of the handle assembly 1 is also fixedly connected to a locking member 3; the upper end of the locking member 3 is fixedly connected to the handle assembly 1, and the lower end is provided with a hooking portion 31.

[0049] When the platform lifting and moving mechanism 100 is in a working state of movably carrying the platform, the handle assembly 1 spans across a step 201, and the locking member 3 contacts and is stopped at the front end 2011 of the step 201, thereby maintaining the current state of the platform lifting and moving mechanism 100. At this time, the hook portion 31 is located below the front end 2011 of the step 201; in this working state, the handle assembly 1 can be manipulated to be pulled forward (a predetermined distance) so that the hook portion 31 moves out from under the step 201 to an unlocked state that is not blocked; when the hook portion 31 is in the unlocked state, the handle assembly 1 is allowed to be manipulated to flip upward, and at this time, the lifting chassis 5b is pressed down and lifted under the gravity of the platform, and the platform drops to the ground by itself.

[0050] The platform is carried by the platform lifting and moving mechanism 100, and the gravity of the platform presses down the lifting chassis 5b, and then pulls the handle assembly 1 back through the connecting rod 4, forcing the locking member 3 to contact the front end 2011 of the step 201 and be stopped, so as to maintain the current state of the platform lifting and moving mechanism 100. In this way, the platform lifting and moving mechanism 100 uses the gravity of the platform itself to maintain its lifted and unlocked state. During the walking process, even if there is an unexpected vibration caused by passing by obstacles or uneven roads, the handle assembly 1 is maintained in a working state due to the presence of the hook part 31, and no unexpected displacement occurs, thereby being able to maintain the load-bearing and moving state of the platform.

[0051] It should be noted that the front, rear, left, right, upper and lower orientations of the present utility model are referenced based on the orientation of the combined platform in its normal use state. For example, when a staff member climbs the step 201 or pulls the handle in a facing posture, the end of the step 201 or the handle that faces or is close to the staff member is the front end, and the end facing away from the person is the rear end. The left and right directions are based on the left and right directions when the user climbs the ladder or pushes the platform, which is also the transverse direction in this application.

[0052] When the platform lifting and moving mechanism 100 is in the working state ( Fig. 9 , Fig.10 state A) of movably carrying the platform, the connecting rod 4 and the rear end of the step 201 are spaced apart by a predetermined distance L1; the predetermined distance L1 is the maximum distance that the handle assembly 1 is allowed to be pulled forward in the working state. In this working state, the length of the hook portion 31 located below the step 201 is L2, where L1 is greater than L2.

[0053] The rotatable angle range of the handle assembly 1 relative to the connecting rod 4 is greater than 90 degrees. Specifically, the handle assembly 1 includes left and right handrails 11 and a middle handle 12. The rear ends 111 of the left and right handrails 11 are rotatably connected to the upper end of the connecting rod 4. The upper end of the connecting rod 4 is connected to the rear end of the handrail 11 through a pivot shaft 112. The cross-section of the connecting rod 4 is in the shape of a "匚", and the pivot shaft 112 penetrates through the upper end of the connecting rod 4 and the rear end of the handrail 11 at the same time to form a rotational connection. The left and right handrails 11 are horizontally arranged on the left and right sides of the middle handle 12, and the whole is in a U shape.

[0054] The platform connecting frame 5a and the lifting bottom frame 5b are connected through an intermediate connecting member. The two ends of the intermediate connecting member are respectively rotatably connected to the platform connecting frame 5a and the lifting bottom frame 5b. Specifically, there are two front and rear intermediate connecting members between the platform connecting frame 5a and the lifting bottom frame 5b. The two front and rear intermediate connecting members are arranged in parallel and are respectively connected to the front ends of the platform connecting frame 5a and the lifting bottom frame 5b and the rear ends of the platform connecting frame 5a and the lifting bottom frame 5b to form a parallelogram linkage structure. Figure 1 In, the lower end of the connecting rod 4 is fixedly connected to the front intermediate connecting member. The rolling members are universal wheels, including two front universal wheels 8 and two rear universal wheels 7. The intermediate connecting member is a connecting pair plate, and the upper and lower ends are respectively rotatably connected to the platform connecting frame 5a and the lifting bottom frame 5b. The front connecting pair plate is located in front of the rear connecting pair plate 6. One of the plates in the front connecting pair plate is a flat plate 9, and the other plate is an L-shaped plate 10. The L-shaped plate 10 is fixedly connected to the lower end of the connecting rod 4, and thus the connecting rod 4 moves together with this front connecting pair plate.

[0055] Of course, the lifting body, handle assembly 1, platform connecting frame 5a, lifting base frame 5b and rolling element in this embodiment can refer to the description of the previously applied utility model patent "A mechanism for platform lifting control and a lifting platform in CN217297113U" and the invention patent "A lifting mechanism and a lifting platform for a platform in CN114655874A", and the repeated parts will not be repeated.

[0056] When the handle assembly 1 is in the working state (state A), the angle between the connecting rod 4 and the plane where the platform connecting frame 5a is located is greater than 60 degrees and less than 90 degrees. When the handle assembly 1 moves to the unlocked state (state B), the angle between the connecting rod 4 and the plane where the platform connecting frame 5a is located is less than or equal to 90 degrees. When the handle assembly 1 is rotated in the direction f in the unlocked state and raised to the state C, the user only needs to unlock the locking member 3 to the state C. The weight of the platform itself will help the handle assembly 1 to retreat, and the rotating rod will rotate in the direction g by itself.

[0057] In this embodiment, the locking member 3 includes a locking plate; the hook portion 31 is an inner hook body arranged at the lower end of the locking plate; the locking plate and the inner hook body are an integrally formed structure. The locking plate is fixedly connected to the lower side of the handle assembly 1 in an inwardly inclined manner; the narrow surface of the locking plate faces the step 201. A plurality of locking plates are distributed left and right. The hook body extends obliquely inward and upward at the lower end of the locking plate, and forms a concave groove with the locking plate.

[0058] Two connecting rods 4 are arranged in parallel and are rotatably connected to the two rear ends of the handle assembly 1. In order to improve the structural integrity of the platform lifting and moving mechanism 100 and avoid the problem of asynchronous lifting of the moving wheels on both sides, the platform lifting and moving mechanism 100 is also provided with a reinforcing connecting rod; the two ends of the reinforcing connecting rod are respectively fixedly connected to the two connecting rods 4. The reinforcing connecting rod is perpendicular to the connecting rod 4. In order to further strengthen the structural strength, a plurality of reinforcing connecting rods are fixedly connected in parallel between the two connecting rods 4.

[0059] like Fig.13As shown, in another preferred embodiment, the platform lifting and moving mechanism 100 is further provided with a limiter; the limiter is configured to make the angle between the connecting rod 4 and the plane where the platform connecting frame 5a is located not exceed 90 degrees. The limiter includes a first limit stopper 301 fixedly connected to the platform connecting frame 5a, and the first limit stopper 301 is located at the front side of the connecting rod 4 to limit and stop the connecting rod 4. When the connecting rod 4 rotates to contact with the first limit stopper 301, it is limited. At this time, the angle between the connecting rod 4 and the plane where the platform connecting frame 5a is located does not exceed 90 degrees, and the handle assembly 1 is located at the highest position. For example, when the connecting rod 4 is limited and stopped by the first limit stopper 301, the angle between the connecting rod 4 and the plane where the platform connecting frame 5a is located can be 85 degrees, 86 degrees, 87 degrees or 90 degrees, etc.

[0060] In other embodiments, the limiting member includes a second limiting stopper 302 fixedly connected to the lifting chassis 5b. The second limiting stopper 302 is located at the front side of the intermediate connecting member, and the intermediate connecting member is limited to stop, thereby limiting the connecting rod 4 to an angle of no more than 90 degrees with the plane where the platform connecting frame 5a is located.

[0061] By setting a limiter, the maximum rotation angle of the connecting rod 4 can be limited, and then the maximum standing height of the connecting rod 4 can be limited. It can not only adapt to steps 201 of different heights, but also avoid excessive flipping of the connecting rod 4 (more than 90 degrees). When the connecting rod 4 flips excessively, the weight of the platform will cause the connecting rod 4 to continue to lean forward and it will be difficult to retreat. Even if the staff unlocks the locking piece 3, it is still necessary to push the handle assembly 1 under the weight of the platform, which is labor-intensive. By setting a limiter, the angle between the connecting rod 4 and the plane where the platform connecting frame 5a is located does not exceed 90 degrees, and then the weight of the platform will help the handle assembly 1 to retreat, and the user only needs to unlock the locking piece 3. In addition, by setting the limiter, the user can directly Fig.13 The state shown pulls the platform lifting movement mechanism 100 forward.

[0062] The platform takes a crescent ladder 200 as an example, and there are multiple steps 201 between the two ladder legs of the crescent ladder 200. The platform lifting mobile mechanism 100 is placed in the crescent ladder 200, and the lifting main body is fixedly connected to the bottom of the crescent ladder 200 by bolts or multiple connecting strips. The front end 2011 of the step 201 is a front end plate, and the upper end is a tread 2015 for stepping on. At this time, the connecting rod 4 is in a lying state with the handle assembly 1, and the rolling element and the lifting chassis 5b are in a lifting state, and the platform is not supported. When it is necessary to support the mobile platform, the staff pulls the connecting rod 4 forward through the handle assembly 1 to rotate forward, and the lifting chassis 5b drives the rolling element to descend and translate together until it touches the ground. As the staff further pulls, the rolling element needs to further descend relative to the platform, and the platform is relatively lifted by ground support. Lift the platform to the highest height, at which point the connecting rod 4 contacts the limiter or the rear end of the step 201 contacts the connecting rod 4, and flip the handle assembly 1 downward until the handle assembly 1 is supported by the tread 2015 of the step 201. The handle assembly 1 is limited by the step 201 and cannot continue to flip downward. At this time, after unloading the force, the locking piece 3 of the handle assembly 1 will hook on the front end plate of the step 201, and the inner hook body will be located below the lower end 2012 of the front end plate, completing the lifting and positioning of the platform.

[0063] It should be understood that the above description is for illustration and not for limitation. By reading the above description, many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art. Therefore, the scope of the present teachings should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents possessed by these claims. For the purpose of comprehensiveness, all articles and references, including the disclosures of patent applications and announcements, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to abandon the subject matter, nor should it be considered that the inventor has not considered the subject matter as part of the disclosed utility model subject matter.

Claims

1. A platform lifting and moving mechanism, wherein the platform comprises multiple steps; characterized in that: The platform lifting and moving mechanism comprises: A lifting body used for fixedly connecting the platform, which is provided with a parallel four-link structure and a rolling element; A handle assembly connected to the lifting body; the handle assembly can be manipulated to lift or lower the rolling element through the parallel four-bar linkage structure; wherein the front end of the handle assembly is also fixedly connected to a locking element; the upper end of the locking element is fixedly connected to the handle assembly, and the lower end is provided with a hooking portion; Wherein, when the platform lifting and moving mechanism is in a working state of movably carrying the platform, the locking piece contacts the front end of the step and is stopped, and the hook portion is located below the front end of the step; in this working state, the handle assembly is allowed to be pulled forward a predetermined distance so that the hook portion moves out from under the step to an unlocked state that is not blocked; when the hook portion is in the unlocked state, the handle assembly is allowed to be manipulated to rotate upward.

2. The platform lifting and moving mechanism according to claim 1, characterized in that: The locking member comprises a locking plate; the hooking portion is an inner hook body arranged at the lower end of the locking plate; the locking plate and the inner hook body are an integrally formed structure; the upper end of the locking plate is welded and connected to the handle assembly.

3. The platform lifting and moving mechanism according to claim 2, characterized in that: The locking plate is fixedly connected to the lower part of the handle assembly in an inwardly inclined manner; the narrow surface of the locking plate faces the step; the hook body extends inwardly and upwardly at the lower end of the locking plate, forming a concave groove between the hook body and the locking plate.

4. The platform lifting and moving mechanism according to claim 1, characterized in that: The lifting body includes: a platform connecting frame for fixing the connecting platform and a lifting base frame connected in parallel to the bottom of the platform connecting frame; the rolling member is arranged on the lifting base frame; the handle assembly is connected to the lifting body through a connecting rod; the rear end of the handle assembly is rotatably connected to the upper end of the connecting rod; the rotatable angle range of the handle assembly relative to the connecting rod is greater than 90 degrees.

5. The platform lifting and moving mechanism according to claim 4, characterized in that: When the platform lifting and moving mechanism is in a working state of movably carrying the platform, the connecting rod and the rear end of the step are spaced apart by a predetermined distance; the predetermined distance is the maximum distance that the handle assembly is allowed to be pulled forward in the working state.

6. The platform lifting and moving mechanism according to claim 4, characterized in that: When the handle assembly is in the working state, an angle between the connecting rod and the plane where the platform connecting frame is located is greater than 60 degrees and less than 90 degrees.

7. The platform lifting and moving mechanism according to claim 4, characterized in that: When the handle assembly moves to the unlocked state, the angle between the connecting rod and the plane where the platform connecting frame is located is less than or equal to 90 degrees, and is greater than the angle of the connecting rod in the working state.

8. The platform lifting and moving mechanism according to claim 7, characterized in that: Two connecting rods are arranged in parallel and are rotatably connected to the two rear ends of the handle assembly respectively; The platform lifting and moving mechanism is also provided with a reinforcing connecting rod; the two ends of the reinforcing connecting rod are respectively and vertically fixedly connected to the two connecting rods.

9. The platform lifting and moving mechanism according to claim 8, characterized in that: A plurality of reinforcing connecting rods are fixedly connected in parallel between the two connecting rods.

10. The platform lifting and moving mechanism according to claim 4, characterized in that: The platform lifting and moving mechanism is also provided with a limiting member; the limiting member is configured to ensure that the angle between the connecting rod and the plane where the platform connecting frame is located does not exceed 90 degrees.

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