Platform lifting and moving mechanism and its assembled platform

Abstract

Provided are a platform lifting and moving mechanism capable of holding a platform and an assembled platform thereof. 【Solution means】The assembled platform includes a platform including multiple steps and a platform lifting and moving mechanism 100. The platform lifting and moving mechanism is provided with a parallel four-link structure and rollers, and includes a lifting body fixedly connecting the platform and a handle assembly 1 connected to the lifting body. The handle assembly can be operated to lift and lower the rollers by the parallel four-link structure, and a locking member 3 is further fixedly connected to the tip of the handle assembly. The locking member is stopped at the tip of the step of the platform so as to maintain the operating state of placing the platform by the platform lifting and moving mechanism.

Description

Technical Field

[0001] This application relates to a lifting assistance mechanism, and particularly to a platform lifting and moving mechanism and its assembled platform.

Background Art

[0002] Assembled platforms are applied to many lifting scenarios, but basically they are fixed. Mainly because of their large volume and heavy weight, it is difficult to realize lifting.

[0003] To solve this problem, a utility model with the publication number CN217297113U discloses a mechanism for controlling platform lifting and a lifting platform. By using a parallel four-link structure and a handle, it assists in manually performing the lifting and transfer operations of the assembled platform. However, during use, it is found that this mechanism frequently has defects such as accidentally releasing the lifted state during transfer, which not only affects the working process but also easily causes safety accidents.

[0004] Furthermore, when performing lifting operations with the handle, defects such as the moving wheels on both sides not synchronously lifting and lowering easily occur, which affects the conveyance and movement efficiency and easily causes safety issues such as rolls.

Summary of the Invention

Problems to be Solved by the Invention

[0005] According to the research of the applicant, although the conventional lifting mechanism is also provided with a locking piece, the locking piece itself is movably provided on the tie rod assembly, and the fixed position of the locking piece itself becomes uncertain due to the form of being movably connected. Furthermore, it has been discovered that the accidental release of the lifted state usually occurs when the ground is not flat. When passing through obstacles such as cables, the obstacles exert a certain inhibitory acting force on the casters. Due to such an acting force, it is possible to just promote the lifting of the base, which is transmitted to the handle assembly, causing the unlocking and retraction of the handle assembly. When passing through the obstacle, a certain degree of vibration occurs in the entire structure. Such vibration is transmitted to the handle assembly, promoting the locking piece thereon to be similarly moved upward unintentionally. Once such upward movement occurs, even if it is slight, since the weight of the platform is very large, the current stable state is quickly destroyed, the handle assembly quickly retracts, the lifting is released, and it has been discovered that the platform quickly drops to the ground.

[0006] In addition, on the left and right sides of the handrail of the conventional lifting mechanism, the lower lifting base is connected using two connecting rods respectively. The two connecting rods are separate and independent. Furthermore, when lifting or lowering, the weight of the platform is too large to ensure complete synchronization on the left and right sides.

Means for Solving the Problems

[0007] In order to solve at least one of the above problems, the present application adopts the following technical solutions.

[0008] A platform lifting and moving mechanism, wherein the platform includes multiple steps, and the platform lifting and moving mechanism includes A lifting body provided with a parallel four-link structure and rollers for fixedly connecting the platform, A handle assembly connected to the lifting body, and the handle assembly can be operated to lift and lower the roller by the parallel four-link structure. A locking member is further fixedly connected to the tip of the handle assembly, and the handle assembly is fixedly connected to the upper end of the locking member. The locking member can be stopped at the tip of the step of the platform so as to maintain the operating state of placing the platform by the platform lifting and moving mechanism.

[0009] As one aspect of the present application, a hook portion is further provided at the lower end of the locking member. When the platform lifting and moving mechanism is in the operating state, the hook portion is located below the tip of the step.

[0010] A platform lifting and moving mechanism, wherein the platform includes multiple steps, and the platform lifting and moving mechanism is provided with a parallel four-link structure and rollers, a lifting body for fixedly connecting the platform, a handle assembly connected to the lifting body, and the handle assembly can be operated to lift and lower the roller by the parallel four-link structure. A locking member is further fixedly connected to the tip of the handle assembly, and the handle assembly is fixedly connected to the upper end of the locking member, and a hook portion is provided at the lower end. When the platform lifting and moving mechanism is in the operating state of movably placing the platform, the locking member contacts and is stopped at the tip of the step, and the hook portion is located below the tip of the step. In this operating state, the handle assembly is allowed to be pulled forward by a predetermined distance, so that the hook portion is moved to an unlocked state where it is not shielded from below the step. When the hook portion is in the unlocked state, the handle assembly is allowed to rotate upward operably.

[0011] In one aspect of the present application, the locking member includes a locking plate, the hooking portion is an inner hook body provided at the lower end of the locking plate, the locking plate and the inner hook body have an integrally formed structure, and the handle assembly is welded and connected to the upper end of the locking plate.

[0012] In one aspect of the present application, the locking plate is inclined inward and fixedly connected below the handle assembly, the narrow surface of the locking plate faces the step, the inner hook body obliquely extends inward and upward from the lower end of the locking plate, and a groove recessed from the locking plate is formed therebetween.

[0013] In one aspect of the present application, the lifting body includes a platform connection frame for fixedly connecting a platform and a lifting base frame connected in parallel below the platform connection frame, the roller is provided on the lifting base frame, the handle assembly is connected to the lifting body via a connecting rod, the rear end of the handle assembly is rotatably connected to the upper end of the connecting rod, and the rotatable angle range of the handle assembly with respect to the connecting rod is greater than 90 degrees.

[0014] In one aspect of the present application, when the platform lifting and moving mechanism is in an operating state where the platform is movably placed thereon, the connecting rod and the rear end of the step are placed at a predetermined distance.

[0015] In one aspect of the present application, in the operating state, the length of the hooking portion located below the step is smaller than the predetermined distance.

[0016] In one aspect of the present application, the predetermined distance is the maximum distance that allows the handle assembly to be pulled forward in the operating state.

[0017] In one aspect of the present application, when the handle assembly is in the operating state, the included angle between the connecting rod and the platform connection frame in the plane where they are located is greater than 60 degrees and less than 90 degrees.

[0018] In one aspect of the present application, when the handle assembly moves to the unlocked state, the included angle between the connecting rod and the platform connection frame in the plane where they are located is 90 degrees or less, and is greater than the included angle in the operating state of the connecting rod.

[0019] In one aspect of the present application, the two connecting rods are provided in parallel and are rotatably connected to the two rear ends of the handle assembly respectively. One or more reinforcing links are further provided in the platform lifting and moving mechanism, and both ends of the reinforcing link are fixedly connected perpendicular to the two connecting rods respectively.

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

[0021] In one aspect of the present application, a position restricting member is further provided in the platform lifting and moving mechanism, and the position restricting member is arranged so that the included angle between the plane where the connecting rod and the platform connection frame are located does not exceed 90 degrees.

[0022] A modular platform, A platform including multiple steps, And a platform lifting and moving mechanism, the platform lifting and moving mechanism Is provided with a parallel four-link structure and rollers, and a lifting body for fixedly connecting the platform. A handle assembly connected to the lifting body, wherein the handle assembly can be operated to lift and lower the roller by the parallel four-link structure, and a locking member is further fixedly connected to the tip of the handle assembly. The locking member can be stopped at the tip of the step of the platform so as to maintain the operating state of placing the platform by the platform lifting and moving mechanism.

[0023] As one aspect of the present application, the platform lifting and moving mechanism can adopt the platform lifting and moving mechanism as described above.

Advantages of the Invention

[0024] Regarding the beneficial effects, The platform lifting and moving mechanism maintains a state where it cannot be unlocked by being lifted by the gravity of the platform itself. Even when passing through obstacles or uneven ground during traveling and there is a tendency for the handle assembly to retract, the handle assembly is maintained in the operating state position due to the presence of the engaging portion, and can maintain the loading and moving state of the platform without any unintended deviation.

[0025] With reference to the following description and drawings, specific embodiments of the present application are disclosed in detail, and aspects in which the principles of the present application can be adopted are clearly shown. It should be understood that the embodiments of the present application are not restricted thereby in terms of scope.

[0026] Regarding the features described and / or shown in one embodiment, they can be used in one or more other embodiments in the same or similar aspects, combined with the features in other embodiments, or substitute the features in other embodiments.

[0027] It must be emphasized that when the term "comprising / including" is used in the text, it refers to the presence of features, entire members, steps or members, but does not exclude the presence or addition of one or more other features, entire members, steps or members.

Brief Description of the Drawings

[0028] To more clearly explain the technical content in the embodiments of the present application or the prior art, the attached drawings necessary for describing the embodiments or the prior art are briefly introduced below. It is obvious that the drawings described below are only certain embodiments of the present application. On the premise that those skilled in the art do not need to make creative efforts, other drawings can be obtained based on these drawings.

[0029]

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Modes for Carrying Out the Invention

[0030] In order for those skilled in the art to better understand the technical solutions in this application, hereinafter, in connection with the drawings in the embodiments of this application, the technical solutions in the embodiments of this application will be clearly and completely described. It is obvious that the described embodiments are only some of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative efforts should belong to the protection scope of this application.

[0031] In addition, when an element is referred to as being "provided on" another element, it may be directly located on the other element, or there may be other elements in the middle. When an element is considered to be "connected to" another element, it may be directly connected to the other element, or there may be other elements existing simultaneously in the middle. Terms such as "vertical", "horizontal", "left", "right" and similar expressions used in this text are for illustrative purposes only and do not represent the only embodiment.

[0032] "Mounting", "connecting", "connecting", "coupling" should be understood in a broad sense. For example, it may be fixedly connected, removably connected, integrated, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or the internal communication of two elements. However, if the same purpose can be achieved with other terms, the above terms may be replaced with other expressions.

[0033] In addition, assembled platforms (such as large stepladders, moon ladders, assembled scaffolds, etc.) are applicable to many climbing scenarios. Since the operator needs to stand on a large platform to work, the large platform is basically fixed. The assembled platform is large in volume and heavy in weight, so it was difficult to lift and change its height. The embodiments of this application provide a mechanism for controlling the lifting of the platform for assembly on a large platform so that the large platform can be lifted and the height of the platform can be further adjusted.

[0034] Hereinafter, with reference to FIGS. 1 to 13, the platform lifting and moving mechanism 100 according to the embodiment of the present application will be described in detail. It should be noted that the following embodiments do not constitute a limitation of the present application and are merely for explaining the present application.

[0035] As shown in FIGS. 1 to 12, the present application provides a platform lifting and moving mechanism 100, and the platform includes a multi-step 201. The platform lifting and moving mechanism 100 is provided with a parallel four-link structure, and includes a lifting body for connecting the platform and a handle assembly 1 connected to the lifting body via a connecting rod 4. The handle assembly 1 can be operated to lift and lower the roller by the parallel four-link structure.

[0036] The lifting body includes a platform connection frame 5a for fixedly connecting the platform and a lifting base frame 5b connected in parallel below the platform connection frame 5a. The lifting base frame 5b is connected to the platform connection frame 5a via a parallel four-link structure and moves up and down relative to the platform connection frame 5a by the parallel four-link structure. A roller is further provided on the lifting base frame 5b.

[0037] The handle assembly 1 is connected to the parallel four-link structure via a connecting rod 4 and can be driven to move the lifting base frame 5b up and down relative to the platform connection frame 5a by using the parallel four-link structure, thereby lifting and lowering the platform. The rear end of the handle assembly 1 is rotatably connected to the upper end of the connecting rod 4. A locking member 3 is further fixedly connected to the front end of the handle assembly 1. The upper end of the locking member 3 is fixedly connected to the handle assembly 1, and a hook portion 31 is provided at the lower end.

[0038] When the platform lifting and moving mechanism 100 is in an operating state where it can movably support the platform, the handle assembly 1 straddles above one step 201, the locking member 3 contacts the tip of the step 201 and is stopped, maintaining the current state of the platform lifting and moving mechanism 100. At this time, the hook portion 31 is located below the tip 2011 of the step 201, and in this operating state, the handle assembly 1 can be steered to be pulled forward (by a predetermined distance) so as to move the hook portion 31 from below the step 201 to an unlocked state where it is not shielded. When the hook portion 31 is in the unlocked state, it allows the handle assembly 1 to be reversibly turned upward operably. At this time, the lifting base frame 5b is pushed down by the gravity of the platform, and the platform descends by itself and falls to the ground.

[0039] When the platform is placed on the platform lifting and moving mechanism 100, the gravity of the platform pushes down the lifting base frame 5b, and further, the connecting rod 4 pulls the handle assembly 1 to retract, so that the locking member 3 contacts the tip 2011 of the step 201 and is stopped, maintaining the current state of the platform lifting and moving mechanism 100. Then, the platform lifting and moving mechanism 100 is lifted by the gravity of the platform itself and maintained in a state where it cannot be unlocked. Even when unexpected vibrations occur when passing through obstacles or uneven ground during travel, the handle assembly 1 is maintained in an operating state due to the presence of the hook portion 31, and can further maintain the loaded and moving state of the platform without causing any unexpected displacement.

[0040] In addition, the directions of front, back, left, right, up, and down in this application refer to the directions when the assembly platform is being used normally. For example, when an operator climbs onto the step 201 or pulls the handle in a facing-to-face position, the end of the step 201 or the handle that faces toward or approaches the operator is considered to be the front end, and the end that faces away from the operator is considered to be the rear end. The left and right directions are based on the left and right directions when the user climbs onto the step or pushes the platform, and similarly, are considered to be the lateral directions in this application.

[0041] When the platform lifting and moving mechanism 100 is in an operational state (state A in Figs. 9 and 10) in which the platform is movably mounted, the connecting rod 4 and the rear end of the step 201 are spaced apart by a predetermined distance L1, and the predetermined distance L1 is the maximum distance that allows the handle assembly 1 to be pulled forward in the operational state. In the operational state, the length of the hook portion located below the step is smaller than the predetermined distance. If the length of the hook portion 31 located below the step 201 is L2, L1 is larger than L2.

[0042] The angle range in which the handle assembly 1 can rotate relative to the connecting rod 4 is greater than 90 degrees. Specifically, the handle assembly 1 includes left and right handrails 11 and a central handle 12, and the rear ends 111 of the left and right handrails 11 are rotatably connected to the upper ends of the connecting rods 4. The upper ends of the connecting rods 4 are connected to the rear ends of the handrails 11 via a pivot shaft 112. The cross section of the connecting rods 4 is in a "U" shape, and the pivot shaft 112 passes through the upper end of the connecting rods 4 and the rear end of the handrails 11 at the same time to form a pivot connection. The left and right handrails 11 are arranged transversely on both the left and right sides of the handrail, forming an overall U-shape.

[0043] Between the platform connection frame 5a and the lifting base frame 5b, they are connected via a central connection member. Both ends of the central connection member are rotatably connected to the platform connection frame 5a and the lifting base frame 5b respectively. The moment arm length of the connection rod 4 is more than 3 times, preferably 5±2 times, the moment arm length of the central connection member. Specifically, between the platform connection frame 5a and the lifting base frame 5b, two front and rear central connection members are provided. The two front and rear central connection members are provided in parallel, and are respectively connected to the front ends of the platform connection frame 5a and the lifting base frame 5b and the rear ends of the platform connection frame 5a and the lifting base frame 5b, constituting a parallel four-link structure. In FIG. 1, the lower end of the connection rod 4 is fixedly connected to the central connection member. The rollers are casters, including two front casters 8 and two rear casters 7. The central connection member is a connection pair plate, and both the upper and lower ends are rotatably connected to the platform connection frame 5a and the lifting base frame 5b respectively. The front connection pair plate is located on the front side of the rear connection pair plate 6. One plate of the front connection 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 connection rod 4. Furthermore, the connection rod 4 moves together with the front connection pair plate.

[0044] Of course, the lifting body, the handle assembly 1, the platform connection frame 5a, the lifting base frame 5b and the rollers in this embodiment can refer to the descriptions of the previously filed utility model patent "Platform Lifting Control Mechanism and Lifting Platform of CN217297113U" and the invention patent "Lifting Mechanism and Lifting Platform for Platform of CN114655874A". For overlapping parts, detailed descriptions are omitted.

[0045] When the handle assembly 1 is in the operating state (state A), the included angle between the connection rod 4 and the platform connection frame 5a in the plane where they are located is greater than 60 degrees and less than 90 degrees. When the handle assembly 1 moves to the unlocked state (state B), the included angle between the connection rod 4 and the platform connection frame 5a in the plane where they are located is 90 degrees or less. When the handle assembly 1 is rotated in the f direction in the unlocked state and lifted as shown in state C, the user only needs to unlock the lock member 3 in state C. The self-weight of the platform helps the handle assembly 1 to retract, and the rotating rod rotates in the g direction by itself.

[0046] In this embodiment, the lock member 3 is provided on the handle assembly 1 and can be stopped at the tip of the step of the platform so as to maintain the operating state of placing the platform by the platform lifting and moving mechanism. The lock member 3 includes a lock plate, and the hook portion 31 is an inner hook body provided at the lower end of the lock plate. The lock plate and the inner hook body have an integrally formed structure. The lock plate is inclined inward and fixedly connected below the handle assembly 1, and the narrow surface of the lock plate faces the step 201. A plurality of lock plates are distributed on the left and right. The inner hook body obliquely extends inward and upward from the lower end of the lock plate, forming a recessed groove with the lock plate.

[0047] The two connection rods 4 are provided in parallel and are respectively 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 defect that the moving wheels on both sides do not rise synchronously, the platform lifting and moving mechanism 100 is further provided with a reinforcing link, and the two connection rods 4 are respectively fixedly connected to both ends of the reinforcing link. The reinforcing link and the connection rod 4 are perpendicular to each other. In order to further reinforce the structural strength, a plurality of reinforcing links are fixedly connected in parallel between the two connection rods 4.

[0048] As shown in FIG. 13, in another preferred embodiment, the platform lifting and moving mechanism 100 is further provided with a position restricting member, and the position restricting member is arranged such that the included angle between the plane where the connecting rod and the platform connection frame 5a are located does not exceed 90 degrees. The position restricting member is a first position restricting rod 301 fixedly connected on the platform connection frame 5a, located on the front side of the connecting rod 4, and includes the first position restricting rod 301 that restricts the position of the connecting rod 4 to be a stopper. When the connecting rod 4 rotates until it contacts the first position restricting rod 301, it is position-restricted. At this time, the included angle between the connecting rod 4 and the platform connection frame 5a in the plane where they are located does not exceed 90 degrees, and the handle assembly 1 is at the highest position. For example, when the connecting rod 4 is position-restricted and stopped by the first position restricting rod 301, the included angle between the connecting rod 4 and the platform connection frame 5a in the plane where they are located may be 85 degrees, 86 degrees, 87 degrees, or 90 degrees, etc.

[0049] In another embodiment, the position restricting member includes a second position restricting rod 302 fixedly connected on the lifting base frame 5b. The second position restricting rod 302 is located on the front side of the central connecting member, and restricts the central connecting member to be a stopper, thereby restricting the included angle between the connecting rod 4 and the plane where the platform connection frame 5a is located not to exceed 90 degrees.

[0050] By providing a position restricting member, the maximum rotation angle of the connecting rod 4 can be limited, and further, the maximum standing height of the connecting rod 4 can be restricted. It can not only be adapted to the steps 201 of different heights, but also avoid the excessive inversion (exceeding 90 degrees) of the connecting rod 4. When the connecting rod 4 is excessively inverted, due to the weight of the platform, it becomes difficult to continue to lie down the connecting rod 4 forward and degenerate. Even if the operator unlocks the locking member 3, it is necessary to push the handle assembly 1 against the weight of the platform, resulting in a large working intensity. On the other hand, by providing a position restricting member, the included angle between the plane where the connecting rod 4 and the platform connecting frame 5a are located does not exceed 90 degrees. Furthermore, the weight of the platform helps the retraction of the handle assembly 1, and the user only needs to unlock the locking member 3. Additionally, due to the installation of the position restricting member, the user can directly pull the platform lifting and moving mechanism 100 forward in the state shown in FIG. 13 in a no-load state.

[0051] In another embodiment of the present application, a modular platform including a platform including multiple steps and a platform lifting and moving mechanism is further provided. Here, the platform lifting and moving mechanism adopts the platform lifting and moving mechanism described in the above embodiment, and detailed description is omitted here.

[0052] Furthermore, for the standing part, surrounding part, and other parts (such as the frame part of the ladder legs) of the platform of the modular platform provided by this embodiment, any appropriate existing structure can be selected. To clearly and concisely explain the technical solution provided by this embodiment, detailed description of these parts is omitted here.

[0053] Taking the platform ladder 200 as an example, there are multiple steps 201 between the two ladder legs of the platform ladder 200. The platform lifting and moving mechanism 100 is placed inside the platform ladder 200 and fixedly connects the lifting body to the lower part of the platform ladder 200 by bolts or a plurality of connecting bars. The tip 2011 of the step 201 is a tip plate, and the upper end is a tread surface 2015 for stepping. At this time, the connecting rod 4 is in a horizontal state together with the handle assembly 1, and the roller and the lifting base frame 5b are in a lifted state and do not support the platform. When it is necessary to support and move the platform, the operator pulls the connecting rod 4 forward and rotates it forward through the handle assembly 1. The lifting base frame 5b is lowered and advanced together with the roller until it contacts the ground. As the operator further pulls, the roller needs to be further lowered relative to the platform, and the platform is relatively lifted by ground support. When the platform is lifted to the highest height, at this time, the connecting rod 4 contacts the position regulating member, or the rear end of the step 201 contacts the connecting rod 4, and the handle assembly 1 is inverted downward until it is placed on the tread surface 2015 of the step 201. The handle assembly 1 is position-regulated by the step 201 so that it cannot be inverted further downward. At this time, after releasing the force, the locking member 3 of the handle assembly 1 catches on the tip plate of the step 201, and the inner hook body is located below the lower end 2012 of the tip plate, and the lifting positioning of the platform is completed.

[0054] The above description should be understood as illustrative and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of ordinary skill in the art upon reading the above description. Accordingly, the scope of the present teachings is not determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents of these claims. For the purpose of completeness, all articles and references (including published patent applications and publications) are hereby incorporated by reference. Although not recited in the claims, any aspect of the subject matter disclosed herein is not intended to be dedicated to the public and the inventors should not be regarded as having disclaimed such subject matter as part of the claimed subject matter of the disclosure.

Claims

1. A platform lifting and moving mechanism, the platform including multiple steps, the platform lifting and moving mechanism comprising: a lifting body provided with a parallel four-link structure and rollers for fixedly connecting said platform; The lifting device includes a handle assembly connected to the lifting body, and the handle assembly can be operated to lift and lower the roller by the parallel four-link structure. A locking member is further fixedly connected to the tip of the handle assembly, and the handle assembly is fixedly connected to the upper end of the locking member. The locking member can be stopped at the tip of a platform step so as to maintain an operating state in which the platform is placed by the platform lifting movement mechanism. Platform lifting and moving mechanism.

2. The handle assembly is fixedly connected to an upper end of the lock member, and a hook is provided at a lower end of the lock member. When the platform lifting and moving mechanism is in an operational state in which the platform is movably placed, the locking member comes into contact with the tip of the step to be stopped, and the hook portion is located below the tip of the step, and in this operational state, the handle assembly is allowed to be pulled forward a predetermined distance to move the hook portion from below the step to an unlocked state where it is not shielded, and when the hook portion is in the unlocked state, the handle assembly is allowed to operably rotate upward.

2. The platform lifting and moving mechanism according to claim 1.

3. The locking member includes a locking plate, and the hook portion is an inner hook body provided at the lower end of the locking plate. The locking plate and the inner hook body are integrally formed, and the handle assembly is welded to the upper end of the locking plate.

3. The platform lifting and moving mechanism according to claim 2.

4. The lock plate is inclined inwardly and fixedly connected to the lower part of the handle assembly, the narrow surface of the lock plate faces the step, and the inner hook body extends obliquely inwardly and upwardly from the lower end of the lock plate, forming a recessed groove between the lock plate and the inner hook body.

4. The platform lifting and moving mechanism according to claim 3.

5. The lifting body includes a platform connection frame for fixedly connecting a platform, and a lifting base frame connected parallel to a lower side of the platform connection frame, the roller is provided on the lifting base frame, the handle assembly is connected to the lifting body through a connecting rod, a rear end of the handle assembly is rotatably connected to an upper end of the connecting rod, and a rotatable angle range of the handle assembly relative to the connecting rod is greater than 90 degrees.

3. The platform lifting and moving mechanism according to claim 2.

6. When the platform lifting and moving mechanism is in an operating state in which the platform is movably mounted, the connecting rod and the rear end of the step are spaced apart by a predetermined distance, and the length of the hook portion located below the step is shorter than the predetermined distance.

6. The platform lifting and moving mechanism according to claim 5.

7. When the handle assembly is in the operating state, the connecting rod and the platform connecting frame form a plane with an included angle greater than 60 degrees and smaller than 90 degrees, and when the handle assembly moves to the unlocked state, the connecting rod and the platform connecting frame form a plane with an included angle less than 90 degrees, which is greater than the included angle of the connecting rod in the operating state.

6. The platform lifting and moving mechanism according to claim 5.

8. The two connecting rods are arranged in parallel and pivotally connected to the two rear ends of the handle assembly, respectively; The platform lifting and moving mechanism is further provided with one or more reinforcing links, and both ends of the reinforcing links are fixedly connected to the two connecting rods vertically, respectively.

8. The platform lifting and moving mechanism according to claim 7.

9. The platform lifting and moving mechanism is further provided with a position restricting member, and the position restricting member is disposed so that the angle between the plane on which the connecting rod and the platform connecting frame are located does not exceed 90 degrees.

6. The platform lifting and moving mechanism according to claim 5.

10. A platform including multiple steps; a platform lifting and moving mechanism, the platform lifting and moving mechanism comprising: a lifting body provided with a parallel four-link structure and rollers, which fixedly connects said platform; The lifting device further includes a handle assembly connected to the lifting body, the handle assembly being operable to lift and lower the roller by the parallel four-link structure, and a locking member is further fixedly connected to the tip of the handle assembly, and the locking member can be stopped at the tip of the platform step so as to maintain an operating state in which the platform is placed by the platform lifting movement mechanism. A modular platform characterized by:

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