CN219217441U - Lifting vehicle - Google Patents

Abstract

The utility model discloses a lifting vehicle, which comprises: a frame; the lifting device comprises a lifting table and a first driving device, the lifting table is arranged on the frame in a vertically movable manner, and the first driving device is used for driving the lifting table to move; the driving wheel assembly is arranged on the frame and can be switched between an extending state and a retracting state, and the driving wheel assembly can drive the frame to move in the extending state. The lifting vehicle provided by the embodiment of the utility model can move or lift the power battery, and is beneficial to improving the efficiency of dismounting and mounting the power battery.

Description

Lifting vehicle

Technical Field

The utility model relates to the field of automobile production and maintenance, in particular to a lifting vehicle.

Background

In the related art, the power battery of the electric automobile is heavy, when the power battery needs to be disassembled and assembled, the power battery needs to be placed on the lifting vehicle, the lifting vehicle is moved by manpower, and the hydraulic pump is operated to lift the power battery, so that the labor intensity of workers is high and the efficiency is low.

Disclosure of Invention

In view of the above, the present utility model aims to provide a lift truck that can move or lift a power battery, which is advantageous in improving the efficiency of the disassembly and assembly of the power battery.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

a lift truck comprising: a frame; the lifting device comprises a lifting table and a first driving device, wherein the lifting table is arranged on the frame in a vertically movable manner, and the first driving device is used for driving the lifting table to move; the driving wheel assembly is arranged on the frame and is switchable between an extending state and a retracting state, and the driving wheel assembly can drive the frame to move in the extending state.

The lifting vehicle provided by the embodiment of the utility model can move or lift the power battery, and is beneficial to improving the efficiency of dismounting and mounting the power battery.

Compared with the prior art, the lifting vehicle has the following additional technical characteristics:

according to some embodiments of the utility model, the lift truck further comprises a second driving device connected to the frame and the driving wheel assembly for driving the driving wheel assembly to switch between the extended state and the retracted state.

In some embodiments, the second driving means comprises: a securing member secured to one of the drive wheel assembly and the frame; the moving piece is in transmission connection with the fixed piece, the moving piece is connected with one of the driving wheel assembly and the frame, and the moving piece moves relative to the fixed piece so as to drive the driving wheel assembly to switch between an extending state and a retracting state.

In some examples, the moving member is in sliding engagement with the frame, one of the moving member and the frame having a concave spherical surface and the other having a convex spherical surface that engages the concave spherical surface.

In some examples, the stationary member defines a chamber therein for storing a liquid, and the movable member is in close engagement with an inner peripheral wall of the chamber.

In some examples, the second driving device further includes a control lever coupled to the fixed member for controlling movement of the movable member.

In some embodiments, the drive wheel assembly comprises: the base is rotatably connected with the frame through a connecting rod, and the second driving device is arranged between the base and the frame; the driving wheel is rotatably arranged on the base; and the third driving device is connected with the driving wheel and used for driving the driving wheel to rotate.

In some examples, a reset member is disposed between the frame and the base, one end of the reset member is connected to the frame and the other end is connected to the base for driving the drive wheel assembly to switch from the extended state to the retracted state.

In some examples, the third drive means comprises a motor and a decelerator.

According to some embodiments of the utility model, the lower part of the frame is provided with a plurality of supporting wheels, and in the extended state of the driving wheel assembly, the driving wheel assembly is matched with a part of the supporting wheels to drive the frame to move; and/or the frame is provided with a control valve, and the control valve is used for controlling the first driving device to work.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 is a schematic structural view of a lift truck according to an embodiment of the present utility model.

Reference numerals illustrate: a lifting vehicle 1,

A frame 100,

A lifting table 210, a first driving device 220,

Base 310, driving wheel 320, connecting rod 330,

A fixed member 410, a movable member 420, a control lever 430,

Reset piece 500, support wheel 600, control valve 700.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

The utility model will be described in detail below with reference to fig. 1 in connection with an embodiment.

The lift truck 1 according to an embodiment of the present utility model includes a frame 100, a lifting device, and a driving wheel assembly.

The lifting device comprises a lifting platform 210 and a first driving device 220, wherein the lifting platform 210 is arranged on the frame 100 in a vertically movable manner, and the first driving device 220 is used for driving the lifting platform 210 to move so as to drive the objects on the lifting platform 210 to lift to a proper height.

Specifically, the user may place the power battery on the lifting platform 210, and when the first driving device 220 drives the lifting platform 210 to move up and down, the power battery may be driven to move up and down to drive the power battery to rise or fall to a proper height, so that the user may perform maintenance, replacement, and other operations on the power battery.

The driving wheel assembly is arranged on the frame 100, and the driving wheel assembly can be switched between an extending state and a retracting state, and can be driven to walk by the electric power of the storage battery in the extending state, so that the frame 100 is driven to move, and the lifting table 210 and the first driving device 220 are further driven to move, so that the power battery is moved to a designated place.

In some embodiments, the power cells are often required to be disassembled and assembled during maintenance of the electric vehicle. The power battery of the electric automobile is mostly arranged at the bottom of the electric automobile, and the electric automobile is required to be lifted to a certain height when being dismounted, so that a user can conveniently operate the lower part of the electric automobile.

When the power battery needs to be detached, the user can move the lifting vehicle 1 to the lower part of the electric vehicle, and then control the first driving device 220 to drive the lifting table 210 to lift to be attached to the power battery at the bottom of the electric vehicle, so that the lifting table 210 can bear the weight of the power battery, the user can detach the power battery from the electric vehicle conveniently, and then control the first driving device 220 to drive the lifting table 210 to descend to the common height.

At this time, the user adjusts the driving wheel assembly to be in an extended state, so as to drive the lifting vehicle 1 and the power battery to move to a designated place through the driving wheel assembly.

In addition, when the power battery needs to be mounted, the mounting step is opposite to the dismounting step.

Specifically, by utilizing the lift truck 1 of the application to detach or mount the power battery, the difficulty of user operation can be reduced, the workload of the user can be reduced, and the work efficiency of the user can be improved conveniently.

Therefore, according to the lift truck 1 of the embodiment of the utility model, only one person is required to move or lift the power battery, which is beneficial to improving the efficiency of dismounting and mounting the power battery.

A lift truck 1 according to an embodiment of the present utility model is described below with reference to the accompanying drawings.

As shown in fig. 1, a lift truck 1 according to an embodiment of the present utility model includes a frame 100, a lifting device, and a drive wheel assembly.

In some embodiments of the present utility model, the first driving device 220 is a cylinder-piston structure to drive the lifting platform 210 to move in the up-down direction. Under normal conditions, the lifting vehicle 1 only needs to lift the power battery at the fixing station, and the fixing station is generally provided with an air source, so that the air cylinder piston structure can lift the power battery by utilizing the air source at the fixing station.

Wherein a cylinder piston structure may be disposed under the middle of the elevating platform 210. Specifically, the cylinder piston structure includes a cylinder, a piston and a piston rod, the cylinder is disposed on the frame 100, one end of the piston rod is connected with the piston, the piston is in sliding fit with the inner peripheral wall of the cylinder, and the other end of the piston rod is connected with the middle lower surface of the lifting platform 210.

When the power battery needs to be lifted, the control valve of the air cylinder can be operated to extend the piston rod, so that the lifting platform 210 is pushed to lift together with the power battery, and the height of the power battery attached to the mounting surface of the vehicle body is reached.

In some embodiments, the frame 100 is provided with a plurality of linear bearing blocks, the lower surface of the lifting platform 210 is provided with a plurality of guide shafts arranged at intervals, and the guide shafts are in sliding fit with the linear bearing blocks, so as to play a role in guiding and limiting, and prevent the lifting platform 210 from tilting in the lifting process. The number of the guide shafts and the linear bearing sliding blocks can be two or more. In some embodiments of the utility model, the lift truck 1 further comprises a second drive means connected to the frame 100, the drive wheel assembly for driving the drive wheel assembly to switch between the extended and retracted state.

Through setting up second drive arrangement, be convenient for when needs drive lift car 1 and remove, drive wheel subassembly switches to the state of stretching out, when need not to drive lift car 1 and remove, drive wheel subassembly switches to the state of retrieving, is convenient for accomodate drive wheel subassembly better, avoids article in the external environment to cause the drive wheel subassembly to scratch, damages drive wheel subassembly.

As shown in fig. 1, in some alternative embodiments of the present utility model, the second driving means includes a fixed member 410 and a movable member 420, the fixed member 410 is fixed to one of the driving wheel assembly and the vehicle frame 100, the movable member 420 is movably coupled to the fixed member 410, the movable member 420 is coupled to the other of the driving wheel assembly and the vehicle frame 100, and the distance between the vehicle frame 100 and the driving wheel assembly can be increased or decreased when the movable member 420 moves relative to the fixed member 410.

Specifically, the mover 420 and the stator 410 control the switching of the driving wheel assembly before the extended state and the retracted state by adjusting the distance between the frame 100 and the driving wheel assembly.

In some embodiments, the fixing member 410 is fixed to the driving wheel assembly, the moving member 420 is connected to the frame 100, and the user can control the moving member 420 to move in an up-down direction relative to the fixing member 410 (the up-down direction is shown in fig. 1, it should be understood that the above-mentioned direction limitation is only for convenience of description of the drawings, and does not limit the actual setting position and direction of the lift car 1).

When the user controls the moving member 420 to move upward relative to the fixed member 410, the moving member 420 has an upward force on the frame 100, the frame 100 has a downward reaction force on the moving member 420 and the fixed member 410, and under the reaction force, the fixed member 410 and the driving wheel assembly can move downward relative to the frame 100, and at this time, the driving wheel assembly can be switched to the extended state.

When the user controls the moving member 420 to move downward relative to the fixed member 410, the moving member 420 removes the upward force on the carriage 100 and moves the carriage 100 and the driving wheel assembly toward each other, at which time the driving wheel assembly can be switched to the retracted state.

In some embodiments of the present utility model, the moving member 420 is slidably engaged with the frame 100, one of the moving member 420 and the frame 100 has a concave spherical surface and the other has a convex spherical surface engaged with the concave spherical surface, so that the moving member 420 uniformly applies a force to the frame 100.

Specifically, when the moving member 420 moves upward relative to the fixed member 410, an interaction force is provided between the moving member 420 and the frame 100, and the frame 100 moves relative to the moving member 420. The moving member 420 is matched with the frame 100 through the convex spherical surface and the concave spherical surface, so that the frame 100 can be prevented from being blocked at a certain position when moving relative to the moving member 420.

That is, as the state of the driving wheel assembly is switched, the posture (e.g. the extending direction) of the moving member 420 is also adjusted, and by adopting the sliding fit of the concave spherical surface and the convex spherical surface, it is ensured that the moving member 420 can be smoothly matched with the frame 100 all the time during the posture adjustment.

In addition, it is convenient to ensure that the force of the moving member 420 on the frame 100 is always uniformly applied to the frame 100 when the frame 100 moves relative to the moving member 420, so that stable movement of the frame 100 is ensured. And, when the vehicle frame 100 needs to be steered, steering operation is facilitated.

In some embodiments, the frame 100 has a mounting plate extending outwards along a horizontal direction, the lower surface of the mounting plate has a concave spherical surface, the second driving device is arranged below the mounting plate, the lower end of the moving member 420 is movably matched with the fixed member 410, and the upper end of the moving member 420 has a convex spherical surface, so that the moving member 420 and the frame 100 are better matched.

In some alternative embodiments, the fixing member 410 defines a chamber for storing the liquid therein, and the moving member 420 is tightly engaged with an inner peripheral wall of the chamber to seal the chamber and move the moving member 420 by pressure of the liquid in the chamber. That is, the fixed member 410 may form a hydraulic cylinder and the moving member 420 forms a piston assembly engaged with the hydraulic cylinder.

In other alternative embodiments, the stationary member 410 includes a gear and the movable member 420 is formed as a rack that mates with the gear.

When the driving gear rotates positively, the gear can drive the rack to move upwards, so as to drive the frame 100 and the driving wheel assembly to move oppositely, so as to increase the distance between the frame 100 and the driving wheel assembly and drive the driving wheel assembly to switch to an extended state. When the driving gear rotates reversely, the gear can drive the rack to move downwards, so that the frame 100 and the driving wheel assembly are driven to move oppositely, the distance between the frame 100 and the driving wheel assembly is reduced, and the driving wheel assembly is driven to be switched to a retracted state.

In some embodiments of the present utility model, the second driving device further includes a control lever 430, and the control lever 430 is connected to the fixed member 410 for controlling the movement of the moving member 420, so that the user can control the movement of the moving member 420 through the control lever 430 to control the driving wheel assembly to switch between the extended state and the retracted state.

In some embodiments, a transmission member is disposed below the control rod 430, the transmission member defines a sealing cavity, the sealing cavity is communicated with the cavity, a pushing member is disposed in the sealing cavity, the pushing member can be in a piston structure, and the pushing member is tightly matched with the inner peripheral wall of the sealing cavity so as to ensure the sealing of the sealing cavity. The control rod 430 is cooperatively connected with the pusher to drive the pusher to move within the sealed cavity.

When the user presses down the control lever 430, the pushing member is pushed to move downward in the sealing cavity, and as the sealing cavity is communicated with the cavity, the pressure of the liquid in the cavity is increased, the moving member 420 is pushed to move upward, and the driving wheel assembly is further controlled to be switched to the extending state.

When the user lifts the control lever 430 upward, the pushing member may be pulled to move upward in the sealing chamber, and since the sealing chamber is communicated with the chamber, the pressure of the liquid in the chamber is reduced, and the moving member 420 is no longer pushed upward, at this time, the moving member 420 moves downward, thereby controlling the driving wheel assembly to be switched to the retracted state.

In other embodiments, the control lever 430 is cooperatively coupled to the gear to drive the gear in rotation, further driving the rack in upward or downward movement, further controlling the drive wheel assembly to switch between the extended and retracted states.

In some alternative embodiments of the present utility model, the drive wheel assembly includes a base 310, the base 310 being rotatably coupled to the frame 100 by a connecting rod 330, i.e., the base 310 is rotatable relative to the frame 100.

Further, the driving wheel assembly further includes a driving wheel 320, where the driving wheel 320 is rotatably disposed on the base 310, and when the base 310 swings relative to the frame 100, the driving wheel 320 can be driven to swing relative to the frame 100, so as to adjust the position of the driving wheel 320.

The driving wheel assembly further comprises a third driving device, wherein the second driving device is arranged between the base 310 and the frame 100, so that the base 310 can be controlled to swing relative to the frame 100 through the second driving device, the distance between the frame 100 and the base 310 is changed, and the distance between the driving wheel 320 and the frame 100 is further controlled to drive the driving wheel assembly to switch between an extending state and a retracting state.

Specifically, when the second driving device drives the base 310 and the frame 100 to move away from each other, the connecting rod 330 rotates downward with respect to the frame 100 to drive the driving wheel assembly to switch downward to the extended state. When the second driving device drives the base 310 and the frame 100 to move toward each other, the connecting rod 330 rotates upward relative to the frame 100 to drive the driving wheel assembly to switch upward to the retracted state.

The third driving device is connected to the driving wheel 320, and is used for driving the driving wheel 320 to rotate, so that the driving wheel 320 is used for driving the frame 100 to move.

In some embodiments of the present utility model, a reset member 500 is disposed between the frame 100 and the base 310, one end of the reset member 500 is connected to the frame 100 and the other end is connected to the base 310, so as to drive the driving wheel assembly to switch from the extended state to the retracted state, thereby simplifying the operation process of the user, and saving time and labor.

In embodiments where the frame 100 includes a mounting plate and the drive wheel assembly includes a base 310, one end of the reset member 500 is coupled to the mounting plate and the other end of the reset member 500 is coupled to the base 310, the reset member 500 may include one or more spaced apart members.

In some embodiments, the second driving device may drive the frame 100 and the base 310 to move away from each other, so as to drive the driving wheel assembly to switch to the extended state, where the reset member 500 is deformed and stretched. When the second driving means no longer has a driving force on the frame 100 and the base 310, the frame 100 and the base 310 may remain in a stable state without relative movement. At this time, the reset member 500 gradually recovers the deformation and can pull the frame 100 and the base 310 to move toward each other, so as to drive the driving wheel assembly to switch to the retracted state.

In other embodiments, the second driving device may drive the frame 100 and the base 310 to move away from each other, so as to drive the driving wheel assembly to switch to the extended state, where the reset member 500 is deformed and stretched. The second driving device can also pull the frame 100 and the base 310 to move towards each other, and at this time, the reset member 500 is deformed to increase the pulling force on the frame 100 and the base 310, so that the frame 100 and the base 310 can stably move towards each other to drive the driving wheel assembly to move to the retracted state.

In some embodiments of the present utility model, the third driving device includes a motor and a speed reducer, where the motor is matched with the speed reducer, so as to reduce the rotation speed of the motor transmitted to the driving wheel, so that the driving wheel 320 stably drives the lift truck 1 to move.

In some embodiments, the driving wheel assembly includes two driving wheels 320, two motors and two reducers, one motor and one reducer are correspondingly matched to form a third driving device, so as to form two third driving devices, and the two third driving devices are correspondingly matched with the two driving wheels 320 one by one, so that each driving wheel 320 has independent driving force, and the driving force of the driving wheel assembly is increased. Even under the condition that the lifting vehicle 1 and the power battery have large mass, the driving wheel assembly can still stably drive the lifting vehicle 1 and the power battery to move.

In some alternative embodiments of the present utility model, the control lever 430 is provided with a button electrically connected to the motor, and the user can control the start and stop of the motor through the button, and further control the rotation of the driving wheel 320 to control the movement of the lift car 1.

In addition, the button is provided on the control lever 430, so that the button and the control lever 430 are integrally provided to control the rotation of the motor and the movement of the moving member 420 through the control lever 430, and the movement of the lift truck 1 by the user through the control lever 430 and the switching of the driving wheel assembly between the extended state and the retracted state are facilitated.

In some embodiments of the present utility model, a plurality of supporting wheels 600 are provided at the lower portion of the frame 100, and in the extended state of the driving wheel assembly, the driving wheel assembly cooperates with a part of the plurality of supporting wheels 600 to drive the frame 100 to move, so as to ensure that the frame 100 can move stably.

As shown in fig. 1, in the present embodiment, four support wheels 600 are provided at the lower portion of the frame 100, respectively disposed at 4 orientations of the frame 100.

When the driving wheel assembly is in the extended state, the two supporting wheels 600 close to the driving wheel assembly are lifted upwards, and at this time, the driving wheel 320 is matched with the two supporting wheels 600 far from the driving wheel assembly, so as to drive the frame 100 to move. When the driving wheel assembly is in the retracted state, the four supporting wheels 600 are engaged with each other, and a user can adjust the position of the vehicle frame 100 through the four supporting wheels 600.

The four supporting wheels 600 are universal wheels, so that a user can smoothly and smoothly adjust the position of the frame 100.

In some embodiments of the present utility model, the frame 100 is provided with a control valve 700, and the control valve 700 is used to control the operation of the first driving device 220 to control the lifting platform 210 to lift, and further control the lifting of the power battery on the lifting platform 210.

In some embodiments of the present utility model, the upper surface of the base 310 of the drive wheel assembly is connected to a transmission member, and the control lever 430 is cooperatively connected to the transmission member, so that the user can rotate the transmission member by rotating the control lever 430, thereby controlling the rotation of the drive wheel assembly to control the direction of movement of the drive wheel 320 and the direction of movement of the lift truck 1.

When the power battery is required to be installed, the user puts the power battery on the lifting platform 210, and drives the moving member 420 to move upwards by pressing the control lever 430 downwards, and the base 310 moves opposite to the frame 100 at this time, so that the driving wheel assembly is switched to the extended state.

At this time, the two universal wheels under the frame 100 near the driving wheel 320 are separated from the ground, the driving wheel 320 is matched with the two universal wheels far away from the driving wheel 320, and when the user presses a button on the control lever 430, the motor starts to rotate and drives the driving wheel 320 to rotate, so as to drive the lifting vehicle 1 to move to a designated position.

When the lift truck 1 reaches the designated position, the user presses the button again, stopping the rotation of the motor, and at this time, the user pulls the control lever 430 upward, causing the moving member 420 to move downward, and at this time, the base 310 moves toward the frame 100, causing the drive wheel assembly to switch to the retracted state.

At this time, two universal wheels near the driving wheel 320 are grounded, and a user can adjust the position of the lifting vehicle 1 in any direction by using the steering function of the universal wheels, so that the power battery is aligned with the installation position of the power battery on the vehicle body below the vehicle.

Then, the user may press the control valve 700 to cause the first driving device 220 to drive the elevating platform 210 to move in the up-down direction until the power battery is mounted to the mounting position, so that the power battery is mounted to the electric vehicle.

Wherein the step of removing the power battery is opposite to the mounting step.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (10)

1. A lift truck (1), characterized by comprising:

a frame (100);

the lifting device comprises a lifting table (210) and a first driving device (220), wherein the lifting table (210) is arranged on the frame (100) in a vertically movable manner, and the first driving device (220) is used for driving the lifting table (210) to move;

the driving wheel assembly is arranged on the frame (100) and can be switched between an extending state and a retracting state, and the driving wheel assembly can drive the frame (100) to move in the extending state.

2. Lift truck (1) according to claim 1, characterized by further comprising:

and the second driving device is connected with the frame (100) and the driving wheel assembly and is used for driving the driving wheel assembly to switch between the extending state and the retracting state.

3. Lift truck (1) according to claim 2, characterized in that said second driving means comprise:

a securing member (410), the securing member (410) being secured to one of the drive wheel assembly and the frame (100);

the moving piece (420), the moving piece (420) is connected with the fixed piece (410) in a transmission way, the moving piece (420) is connected with one of the driving wheel assembly and the frame (100), and the moving piece (420) moves relative to the fixed piece (410) to drive the driving wheel assembly to switch between an extending state and a retracting state.

4. A lift truck (1) according to claim 3, characterized in that the displacement member (420) is in sliding engagement with the frame (100), one of the displacement member (420) and the frame (100) having a concave spherical surface and the other having a convex spherical surface in engagement with the concave spherical surface.

5. A lift truck (1) according to claim 3, characterized in that the fixed member (410) defines a chamber for storing liquid therein, the moving member (420) being in close fit with the inner peripheral wall of the chamber.

6. A lift truck (1) according to claim 3, characterized in that the second drive means further comprise a control lever (430), the control lever (430) being connected to the stationary member (410) for controlling the movement of the moving member (420).

7. Lift truck (1) according to claim 2, characterized in that the drive wheel assembly comprises:

the base (310) is rotatably connected with the frame (100) through a connecting rod (330), and the second driving device is arranged between the base (310) and the frame (100);

a driving wheel (320), wherein the driving wheel (320) is rotatably arranged on the base (310);

and the third driving device is connected with the driving wheel (320) and is used for driving the driving wheel (320) to rotate.

8. The lift truck (1) according to claim 7, characterized in that a reset member (500) is arranged between the frame (100) and the base (310), one end of the reset member (500) being connected to the frame (100) and the other end being connected to the base (310) for driving the drive wheel assembly to switch from the extended state to the retracted state.

9. Lift car (1) according to claim 7, characterized in that the third drive means comprise a motor and a decelerator.

10. Lift truck (1) according to any of claims 1-9, characterized in that,

the lower part of the frame (100) is provided with a plurality of supporting wheels (600), and when the driving wheel assembly is in an extending state, the driving wheel assembly is matched with one part of the plurality of supporting wheels (600) to drive the frame (100) to move; and/or the number of the groups of groups,

the frame (100) is provided with a control valve (700), and the control valve (700) is used for controlling the first driving device (220) to work.

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