CN221253821U - Stable telescopic lifting device, lifting platform and lifting vehicle - Google Patents

Abstract

The application discloses a stable telescopic lifting device, a lifting platform and a lifting vehicle, wherein the lifting device comprises: the lifting assembly at least comprises a first lifting column and a second lifting column which are in sliding fit, the lifting assembly is in a contracted state and an expanded state, and the second lifting column is sleeved on the periphery of the first lifting column in the contracted state; the driving assembly drives the lifting assembly to enter a contracted state or an expanded state; and the gap eliminating assemblies are at least arranged between gaps between the first lifting column and the second lifting column, each gap eliminating assembly comprises a fixed adapting piece and a self-adapting piece, each self-adapting piece comprises a working piece capable of moving in the radial direction of the lifting column, and the working piece and the fixed adapting piece are respectively matched with the other lifting column to maintain the matched gaps between the first lifting column and the second lifting column. According to the application, the clearance control of the lifting column is realized through the clearance eliminating assembly formed by the matching of the fixed adapting piece and the self-adapting piece, so that the lifting stability and the service life are ensured.

Description

Stable telescopic lifting device, lifting platform and lifting vehicle

Technical Field

The application relates to the field of lifting vehicles, in particular to a lifting device, a lifting platform and a lifting vehicle, wherein the lifting device, the lifting platform and the lifting vehicle are stable and telescopic.

Background

The lift truck plays an important role in the production operation. The lifting mode of the common lifting vehicle is represented by scissors type, crank arm type, mast type and the like according to different use requirements. Along with the development of the technical level, especially the development in the fields of internet of things and intelligent storage, traditional lift trucks are increasingly prominent in short plates on material storage and sorting because of the limitation of traditional design ideas.

Thus, those skilled in the art have optimized designs for this use scenario based on mast hoists. For example, publication CN102372239a discloses a mast lift comprising a base, a platform and a lifting assembly connected between the base and the platform. The lift assembly moves the platform between a lowered position and a raised position. A drive screw is connected between the base and the lift assembly, and a pneumatic support bar acts between the base and the lift assembly and biases the lift assembly and the platform to the raised position.

In order to control the overall size of the device, the mast type lifting device generally adopts a mode that a plurality of lifting columns are sleeved with one another. The inventors found that the technical dilemma in terms of service life and lifting stability of the cooperation between the lifting columns in the prior art limited further developments in this field.

Disclosure of utility model

In order to solve the technical problems, the application discloses a lifting device capable of stably stretching, which comprises:

The lifting assembly at least comprises a first lifting column and a second lifting column which are in sliding fit, the lifting assembly is in a contracted state for reducing the overall axial length and in an opposite expanded state, and the second lifting column is sleeved on the periphery of the first lifting column in the contracted state;

The driving assembly is at least linked with one lifting column in the lifting assembly and drives the lifting assembly to enter the contracted state or the expanded state;

The clearance eliminating assemblies are at least arranged between the gaps between the first lifting columns and the second lifting columns, each clearance eliminating assembly comprises a fixed adapting piece and an adaptive adapting piece, the fixed adapting pieces and the adaptive adapting pieces are symmetrically arranged on one lifting column, each adaptive adapting piece comprises a working piece capable of moving in the radial direction of the lifting column, and the working piece and the fixed adapting piece are respectively matched with the other lifting column to keep the fit gap between the first lifting column and the second lifting column.

The following provides several alternatives, but not as additional limitations to the above-described overall scheme, and only further additions or preferences, each of which may be individually combined for the above-described overall scheme, or may be combined among multiple alternatives, without technical or logical contradictions.

Optionally, the movement direction of the workpiece is the clearance elimination axis of the clearance elimination assembly; at least two anti-backlash components are arranged at the top of the lifting column, and anti-backlash axes of the two anti-backlash components are intersected.

Optionally, a plurality of gap eliminating components are arranged at the top and the bottom of the lifting column; compared with the axis of the lifting column, the self-adaptive fitting at the top of the lifting column and the self-adaptive fitting at the bottom of the lifting column are positioned at the same side; compared with the side wall of the lifting column, the self-adaptive fitting at the top of the lifting column and the self-adaptive fitting at the bottom of the lifting column are positioned at different sides.

Optionally, the plurality of anti-backlash components form an anti-backlash plane, the anti-backlash plane is perpendicular to the axis of the lifting column, and at least four anti-backlash components are included on one anti-backlash plane, wherein the anti-backlash axes of at least two anti-backlash components are perpendicular to each other, and the anti-backlash axes of at least two anti-backlash components are parallel to each other.

Optionally, the adaptive adapting member comprises

The work piece;

a housing fixed on the outer peripheral surface of the first lifting column, wherein the working piece has a working state radially propped against the corresponding lifting column and an assembling state;

And the energy storage mechanism is used for keeping the working piece in the working state.

Optionally, the anti-backlash assembly comprises a driving slide block, the driving slide block is arranged in the shell and slides in the axial direction of the lifting column, a driving inclined plane for driving the workpiece to enter a working state is arranged on the driving slide block, and the energy storage mechanism is used for driving the driving slide block to move.

Optionally, the fixing adaptor and the working piece are made of self-lubricating materials or oil storage structures; or (b)

The fixed adapter and the working piece are matched with the inner peripheral surface of the second lifting column through rolling.

Optionally, the lifting device further comprises a transmission assembly, wherein the transmission assembly is linked with each lifting column of the lifting assembly and synchronizes the movement of each lifting column, and the driving assembly is linked with only one lifting column of the lifting assemblies.

The application also discloses a lifting platform, which comprises:

The lifting device is in the technical scheme;

The operation platform is fixed on one lifting column of the lifting device and changes the self height along with the state switching of the lifting device.

The application also discloses a lift truck, comprising:

The lifting device is in the technical scheme;

The walking chassis is connected with one lifting column of the lifting device and used for driving the lifting device to move on the supporting plane.

According to the technical scheme disclosed by the application, the clearance between the lifting columns is controlled through the clearance eliminating assembly formed by matching the fixed adapting piece and the self-adapting piece, so that the working piece can self-adaptively keep the matching relation between the lifting columns through self-movement, the lifting stability is ensured, and the service life is ensured.

Specific advantageous technical effects will be further explained in the detailed description in connection with specific structures or steps.

Drawings

FIG. 1 is a schematic view of a lift truck according to an embodiment;

FIG. 2 is a schematic diagram illustrating different states of a lifting platform according to an embodiment;

FIG. 3 is a schematic view of a lifting assembly according to an embodiment;

FIG. 4 is a schematic cross-sectional view of the lift assembly of FIG. 3;

FIG. 5 is an enlarged schematic top view of the lift assembly of FIG. 4;

FIG. 6 is a schematic top view of a lift assembly according to one embodiment;

FIGS. 7-9 are schematic diagrams illustrating different viewing angles of an adaptive adapter of an anti-backlash assembly according to an embodiment;

FIG. 10 is a schematic view of an embodiment of a lift truck.

Reference numerals in the drawings are described as follows:

1. A walking chassis;

2. A lifting device; 21. a lifting assembly; 211. a first column; 212. a second column; 213. a third column; 214. a fourth column; 215. the base is connected; 22. a drive assembly; 23. a transmission assembly; 24. an anti-backlash assembly; 241. fixing the adapter; 242. an adaptive adapter; 2421. a housing; 2422. a work piece; 2423. an energy storage mechanism; 2424. driving a sliding block; 2425. a driving inclined plane; 2426. a guide post; 2427. a working window; 243. an anti-backlash axis;

3. An operating platform; 31. a safety barrier; 32. an operation platform; 33. an actuating mechanism.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 10, the present application discloses a stable telescopic lifting device 2, comprising:

The lifting assembly 21 at least comprises a first lifting column and a second lifting column which are in sliding fit, wherein the lifting assembly 21 is provided with a contracted state (such as shown in fig. 1) for reducing the overall axial length and an opposite expanded state (such as shown in fig. 10), and the second lifting column is sleeved on the periphery of the first lifting column in the contracted state;

a driving assembly 22 which is interlocked with at least one lifting column in the lifting assembly 21 and drives the lifting assembly 21 to enter a contracted state or an expanded state;

A plurality of anti-backlash components 24 are arranged at least between the gaps between the first lifting column and the second lifting column, each anti-backlash component 24 comprises a fixed adapter 241 and an adaptive adapter 242 symmetrically arranged on one lifting column, the adaptive adapter 242 comprises a working piece 2422 capable of moving in the radial direction of the lifting column, and the working piece 2422 and the fixed adapter 241 are respectively matched with the other lifting column to maintain the matched gap between the first lifting column and the second lifting column.

In the prior art, sliding fit between the lifting columns of the lifting assembly 21 is often realized through sliding pairs, but in order to realize better lifting stability, especially stability in a unfolded state, the sliding pairs between the lifting columns tend to be designed as tight fit, so that fit gaps and gaps brought by material deformation are eliminated. But a close fit increases the load on the sliding pair, resulting in an increase in the wear rate of the sliding pair. Thus, the technical dilemma in terms of service life and lifting stability mentioned in the background art arises. This problem is further exacerbated as the load of the lifting device 2 and the lifting stroke increase. In order to overcome the above problems, conventional ideas in the prior art are to optimize the strength of the components in the sliding pair, fine-tune the fit clearance of the sliding pair, shorten the maintenance period of the lifting device 2, and the like. However, the above concepts have drawbacks due to the nested assembly of the lifting columns and the material limitations. The technical scheme of the application provides a brand new technical idea through the redesigned gap eliminating assembly 24, the gap eliminating assembly 24 realizes the gap control between the lifting columns through the collocation arrangement of the fixed adapting piece 241 and the self-adapting piece 242, and the working piece 2422 in the self-adapting piece 242 can self-adaptively keep the matching relationship between the lifting columns through self-movement. On the premise of adopting the existing materials and industrial manufacturing capacity, the lifting stability and the service life are ensured, and meanwhile, the maintenance period can be effectively prolonged.

The specific number of the lifting columns is not limited in the present application, and when the number of the lifting columns is greater than two, the first lifting column and the second lifting column mentioned above refer to the relative relationship between the two lifting columns to be analyzed in the coordination. For example, in the embodiment shown in the drawings, three mutually nested lifting columns are provided, namely an innermost first column 211, a middle inner second column 212, a middle outer third column 213 and an outermost fourth column 214. In analyzing the matching relationship between the first column body 211 and the second column body 212 and the arrangement of the anti-backlash assembly 24, the second column body 212 is sleeved on the periphery of the first column body 211, namely, the second column body 212 is a second lifting column in the relationship between the first column body and the second column body, and the first column body 211 is a first lifting column in the relationship between the first column body and the second column body. In analyzing the matching relationship between the second column 212 and the third column 213 and the arrangement of the anti-backlash assembly 24, the third column 213 is sleeved on the outer periphery of the second column 212, that is, the third column 213 is the second lifting column in the relationship between the two columns, and the second column 212 is the first lifting column in the relationship between the two columns. The same applies hereinafter. There is no gap relationship between two non-adjacent lifting columns nor is there a gap eliminating assembly 24 provided, i.e. the concepts of the first lifting column and the second lifting column of the present application are absent.

In the layout of the anti-backlash assembly 24, referring to one embodiment, the motion direction of the work piece 2422 is the anti-backlash axis 243 of the anti-backlash assembly 24 where it is located; at least two anti-backlash assemblies 24 are arranged at the top of the lifting column, and anti-backlash axes 243 of the two anti-backlash assemblies 24 are intersected. The axial direction of the anti-backlash axis 243 is the direction of the force of the anti-backlash assembly 24 on the lifting column. In most cases, the anti-backlash axis 243 is parallel to the line of connection between the fixed adapter 241 and the adaptive adapter 242, and the fixed adapter 241 and the adaptive adapter 242 exert opposing forces on the lifting column in the direction of the anti-backlash axis 243, i.e. forces of equal opposite magnitudes. The gap between two adjacent lifting columns is maintained by the opposing force. Wherein the line between the fixed adapter 241 and the adaptive adapter 242 of some anti-backlash assemblies may not be parallel to its own anti-backlash axis 243, such as the several anti-backlash assemblies shown in fig. 6, for example, for reasons of assembly relation requiring avoidance, etc. The stresses of its fixed adapter 241 and of the corresponding adaptive adapter 242 still satisfy the opposite-directional equality and the direction parallel to the own anti-backlash axis 243, enabling the counter-forces mentioned above to be formed.

The anti-backlash assembly 24 of the present application adopts the form of matching the fixing adaptor 241 and the adaptive adaptor 242, and has the advantage that the fixing adaptor 241 can be matched with the adaptive adaptor 242 to achieve a stroke limiting effect. Compared with the countermeasure system formed by the self-adaptive adapting piece 242 and the self-adaptive adapting piece 242, the countermeasure system formed by the fixed adapting piece 241 and the self-adaptive adapting piece 242 in the application can ensure the coaxiality of each lifting column and reduce the freedom degree of the lifting column in the radial direction while self-adaptively adjusting. This arrangement can effectively improve the lifting stability of the lifting device 2. Stability is further enhanced in this embodiment by intersecting the anti-backlash axes 243 of the two anti-backlash assemblies 24. The two anti-backlash assemblies 24 with the anti-backlash axes 243 intersecting can achieve clearance control of the lifting columns from different dimensions, thereby better achieving coaxiality maintenance of the first lifting column and the second lifting column. In fig. 6, a plurality of anti-backlash assemblies 24 form an anti-backlash plane. The components of the anti-backlash assembly 24 may or may not lie in an anti-backlash plane. The emphasis is that the anti-backlash axes 243 of the plurality of anti-backlash assemblies 24 define an anti-backlash plane, and when the anti-backlash axes of the plurality of anti-backlash assemblies 24 are greater than two, any two of the anti-backlash axes define an anti-backlash plane, and the remaining definitions define an anti-backlash plane that is parallel to the anti-backlash plane. In the illustrated embodiment, the anti-backlash planes are perpendicular to the axis of the lifting column, and at least four anti-backlash assemblies 24 are included on one anti-backlash plane, wherein the anti-backlash axes 243 of at least two anti-backlash assemblies 24 are perpendicular to each other and the anti-backlash axes 243 of at least two anti-backlash assemblies 24 are parallel to each other. In this embodiment, the establishment of the anti-backlash plane not only can improve the coaxiality of the first lifting column and the second lifting column, but also can realize the torsion resistance between the first lifting column and the second lifting column, thereby structurally improving the lifting stability of the lifting device 2.

In addition to optimizing the arrangement of the lifting columns in the radial direction, the anti-backlash assembly 24 may also be optimized for the axial direction of the lifting columns, with reference to the embodiments shown in fig. 4 and 6, in which the top and bottom of the lifting columns are provided with a plurality of anti-backlash assemblies 24. The anti-backlash assemblies 24 arranged at the two axial ends can effectively bear loads of the lifting column under various working conditions, so that lifting stability is guaranteed. In detail, the adaptive fitting 242 at the top of the lifting column is on the same side as the adaptive fitting 242 at the bottom of the lifting column, as compared to the axis of the lifting column. This arrangement can avoid roll of the lifting column due to adaptation of the adaptation piece 242 or wear during use. The self-adapting piece 242 at the top of the lifting column is located on a different side than the self-adapting piece 242 at the bottom of the lifting column compared to the side walls of the lifting column. In this embodiment, the adaptive fitting 242 at the top of a certain lifting column is actually engaged with the lifting column at the outer periphery of the lifting column, and the adaptive fitting 242 at the bottom of a certain lifting column is actually engaged with the lifting column at the inner side of the lifting column. In the embodiment shown in the drawings, the bottom of the first column 211 located at the innermost side is not provided with the anti-backlash assembly 24, mainly because the bottom of the first column 211 is provided with a connection base 215 for connection with the support platform or the walking chassis 1. In other embodiments, the connection base 215 may be disposed on other lifting columns, and accordingly, the bottom of the corresponding lifting column may not be provided with the anti-backlash assembly 24.

In the arrangement of the anti-backlash assembly 24, the fixed adaptor 241 may be provided with an integral structure without movable components, the adaptive adaptor may be provided with a structure in which only the working element 2422 is movable, and the adaptive adaptor 242 may comprise, in the embodiments shown in fig. 7 to 9

Work 2422;

A housing 2421 fixed to an outer peripheral surface of the first elevating column, the working member 2422 having an operating state radially abutted against the corresponding elevating column and an assembled state (refer to fig. 5);

The energy storage mechanism 2423 is used for keeping the work piece 2422 in the working state.

The work piece 2422 is switched to realize the switching of different states by switching the position of the work piece 2422 relative to the shell 2421, and the energy storage mechanism 2423 can realize the radial propping of the work piece 2422 with the corresponding lifting column all the time so as to realize the clearance control. The energy storage mechanism 2423 may act directly between the housing 2421 and the work piece 2422 or between the corresponding lift column side walls and the work piece 2422. In the working condition with high load or high stability requirement, referring to the embodiment shown in the drawings, the anti-backlash assembly 24 includes a driving slide 2424, the driving slide 2424 is disposed in the housing 2421 and slides in the axial direction of the lifting column, a driving inclined plane 2425 for driving the working member 2422 into the working state is disposed on the driving slide 2424, and the energy storage mechanism 2423 is used for driving the driving slide 2424 to move.

In this embodiment, by the torque amplifying effect of the driving slide block 2424 and the driving inclined plane 2425, under the energy storage mechanism 2423 with the same performance, the working member 2422 can apply a larger radial torque to the corresponding lifting column, and the fixing adaptor 241 can achieve a better anti-backlash effect. The lifting device 2 as a whole can thus achieve more excellent lifting stability. At the same time, the drive slide 2424 is able to ensure itself to operate within the protected environment of the housing 2421, thereby avoiding the possibility of direct contact of the energy storage mechanism 2423 and other components with the lifting column side walls due to wear of the work piece 2422, and reducing maintenance costs while ensuring operational stability. For example, work piece 2422 may be replaced separately, and the reset of anti-backlash assembly 24 may be accomplished.

The energy storage mechanism 2423 may be configured as an elastic member, where the adaptive adapter 242 further includes a guide post 2426 fixed on the housing 2421, the energy storage mechanism is a pressure spring wound on the guide post 2426, one end of the pressure spring abuts against the housing 2421, the other end abuts against the driving slider 2424, and the driving slider 2424 moves under the acting force of the pressure spring and cooperates with the working member 2422 through the driving inclined plane 2425 to drive the working member 2422 into a working state. The whole shell is of a closed structure, a working window 2427 is arranged on the side face facing the corresponding lifting column, and the working piece 2422 pops out of the shell 2421 through the working window 2427. In the embodiment shown in the drawings, the working member 2422 still protrudes out of the housing 2421 (the working window 2427) in the assembled state, and this arrangement can fully utilize the effective stroke of the driving slider 2424 and the working member 2422 to prolong the maintenance period.

To further reduce friction, the material may be optimized, for example, in one embodiment, the stationary adapter 241 and the working member 2422 are self-lubricating. The self-lubricating material may be, for example, an oil-containing nylon or a material having the same self-lubricating property and mechanical strength. The fixed adapter 241 and the working member 2422 may also be configured for oil storage by structural optimization, such as in one embodiment. The shape optimization may also be matched, for example, the fixing adaptor 241 and the working member 2422 are matched with the inner peripheral surface of the second elevating post by rolling, for example, metal balls (rollers), engineering plastic balls (rollers), ceramic balls (rollers), and the like.

During installation, the adaptive adapter 242 of this embodiment may move the drive slide 2424 to achieve the assembled state of the work piece 2422 by way of a post which may be configured to be threaded, such as a through hole in the right housing of FIG. 8, configured as a threaded hole and threaded into engagement with the post. After the lifting columns are installed in place, the state switching of the working piece 2422 can be realized by disassembling the jacking columns, so that the assembly process is realized.

The application also discloses an assembling method of the lifting device 2, which comprises

The anti-backlash assembly 24 in the technical scheme is arranged on the lifting columns, and a plurality of lifting columns are sleeved with one another;

The lifting columns are mounted in place and then the top columns of the anti-backlash assemblies 24 are gradually released, and the fit clearances among the lifting columns are adjusted.

The working piece 2422 is in an assembled state, the lifting columns are in clearance fit, and the installation is simple; during the switching of the working member 2422 from the assembled state to the working state, the force of the energy storage mechanism 2423 can be released controllably and slowly by gradual disassembly of the abutments. Therefore, the lifting device 2 disclosed by the application is stable in lifting and long in service life, and solves the problems of complex assembly, large assembly stress and the like in the prior art.

The power for switching the state of the lifting assembly 21 is from the driving assembly 22, and the driving assembly 22 is electrically driven or hydraulically driven. The driving mode can adopt a ball screw pair or a sliding fit pair. To simplify the driving relationship, referring to an embodiment, the driving device further comprises a transmission assembly 23, wherein the transmission assembly 23 is linked with each lifting column of the lifting assembly 21 and synchronizes the movement of each lifting column, and the driving assembly 22 is linked with only one lifting column of the lifting assembly 21. The transmission assembly 23 includes guide rollers provided on the respective lifting columns and traction members (not shown) wound around the guide rollers, which may be traction ropes, chains, or the like. The specific arrangement of the transmission assembly 23 can be found in the prior art and will not be described in detail herein.

In combination with the above description, the lifting device 2 in the above technical solution can achieve a stable and long-acting lifting effect, and as can be seen from fig. 2, the application also discloses a lifting platform, which comprises:

The lifting device 2 is the lifting device 2 in the technical scheme;

The operating platform 3 is fixed on one lifting column of the lifting device 2 and changes the height of the operating platform along with the state switching of the lifting device 2.

The specific arrangement of the lifting device 2 is shown above and will not be described in detail here.

The operating platform 3 can be provided as a cabin or, with reference to the figures, as a standing platform with safety barriers 31. The standing platform is convenient for operators to realize more complex operation actions, and the operation platform 32 is also arranged on the operation platform 3. The working platform 32 and the standing platform are respectively arranged at two sides of the axis of the lifting device 2. The working platform 32 may be fixed on the lifting device 2, or referring to fig. 2, the working platform 32 is movably mounted on the lifting device 2 through an actuating mechanism 33 and can move relative to the standing operation platform 3, so as to provide a more flexible working mode.

In combination with the above description, the lifting device 2 in the above technical solution can achieve a stable and long-acting lifting effect, and as can be seen from fig. 1 and 10, the application also discloses a lifting vehicle, which comprises:

The lifting device 2 is the lifting device 2 in the technical scheme;

The walking chassis 1 is connected with one lifting column of the lifting device 2 and is used for driving the lifting device 2 to move on a supporting plane.

The specific arrangement of the lifting device 2 is shown above and will not be described in detail here.

The walking chassis 1 can be a detachable bracket, can be a platform with rollers, and can also be a controllable self-walking platform as shown in the attached drawings. The walking chassis 1 can move the lifting device 2 in a horizontal position, so that the operation setting modes are enriched.

Further, the lift truck further comprises an operation platform 3, wherein the operation platform 3 is fixed on one lifting column of the lifting device 2 and changes the height of the lift truck along with the state switching of the lifting device 2. The specific arrangement of the operation platform 3 is described above and will not be described in detail.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description. When technical features of different embodiments are embodied in the same drawing, the drawing can be regarded as a combination of the embodiments concerned also being disclosed at the same time.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application.

Claims (10)

1. Stably telescopic elevating gear, its characterized in that includes:

The lifting assembly at least comprises a first lifting column and a second lifting column which are in sliding fit, the lifting assembly is in a contracted state for reducing the overall axial length and in an opposite expanded state, and the second lifting column is sleeved on the periphery of the first lifting column in the contracted state;

The driving assembly is at least linked with one lifting column in the lifting assembly and drives the lifting assembly to enter the contracted state or the expanded state;

The clearance eliminating assemblies are at least arranged between the gaps between the first lifting columns and the second lifting columns, each clearance eliminating assembly comprises a fixed adapting piece and an adaptive adapting piece, the fixed adapting pieces and the adaptive adapting pieces are symmetrically arranged on one lifting column, each adaptive adapting piece comprises a working piece capable of moving in the radial direction of the lifting column, and the working piece and the fixed adapting piece are respectively matched with the other lifting column to keep the fit gap between the first lifting column and the second lifting column.

2. The stable telescopic lifting device of claim 1, wherein the direction of movement of the work piece is a backlash axis of a backlash eliminating assembly; at least two anti-backlash components are arranged at the top of the lifting column, and anti-backlash axes of the two anti-backlash components are intersected.

3. The stable telescopic lifting device according to claim 2, wherein a plurality of anti-backlash components are arranged at the top and the bottom of the lifting column; compared with the axis of the lifting column, the self-adaptive fitting at the top of the lifting column and the self-adaptive fitting at the bottom of the lifting column are positioned at the same side; compared with the side wall of the lifting column, the self-adaptive fitting at the top of the lifting column and the self-adaptive fitting at the bottom of the lifting column are positioned at different sides.

4. The stable telescopic lifting device of claim 2, wherein the plurality of anti-backlash components form an anti-backlash plane and the anti-backlash plane is perpendicular to the axis of the lifting column, and at least four anti-backlash components are included on one anti-backlash plane, wherein the anti-backlash axes of at least two anti-backlash components are perpendicular to each other and the anti-backlash axes of at least two anti-backlash components are parallel to each other.

5. The stable telescopic lifting device of claim 1, wherein the adaptive adapter comprises

The work piece;

A housing fixed on the outer peripheral surface of the first lifting column, wherein the working piece has a working state radially propped against the corresponding lifting column and an assembling state;

And the energy storage mechanism is used for keeping the working piece in the working state.

6. The stable telescopic lifting device according to claim 5, wherein the anti-backlash assembly comprises a driving slide block, the driving slide block is arranged in the shell and slides in the axial direction of the lifting column, a driving inclined surface for driving the workpiece into a working state is arranged on the driving slide block, and the energy storage mechanism is used for driving the driving slide block to move.

7. The stable telescopic lifting device of claim 5, wherein the fixed adapter and the working member are self-lubricating materials or oil storage structures; or (b)

The fixed adapter and the working piece are matched with the inner peripheral surface of the second lifting column through rolling.

8. The stable telescoping lifting device of claim 1, further comprising a transmission assembly coupled to each lifting column of the lifting assembly and synchronizing movement of each lifting column, wherein the drive assembly is coupled to only one lifting column of the lifting assemblies.

9. Lifting platform, its characterized in that includes:

The lifting device is the lifting device according to any one of claims 1 to 8;

The operation platform is fixed on one lifting column of the lifting device and changes the self height along with the state switching of the lifting device.

10. The lift truck, its characterized in that includes:

The lifting device is the lifting device according to any one of claims 1 to 8;

The walking chassis is connected with one lifting column of the lifting device and used for driving the lifting device to move on the supporting plane.