CN211393742U

CN211393742U - Unmanned carrying vehicle

Info

Publication number: CN211393742U
Application number: CN201921814141.1U
Authority: CN
Inventors: 陈盛; 张月; 穆方波
Original assignee: Zhejiang Dahua Robot Technology Co ltd
Current assignee: Zhejiang Huaray Technology Co Ltd
Priority date: 2019-10-25
Filing date: 2019-10-25
Publication date: 2020-09-01
Anticipated expiration: 2029-10-25

Abstract

The utility model provides an unmanned carrying vehicle, including automobile body and fork, the fork is installed on the automobile body, and can reciprocate along vertical axis direction on the automobile body, unmanned carrying vehicle still includes jacking piece, rotation unit and cable, jacking piece includes installation department and can be relative the lift portion that the installation department goes up and down, the installation department is fixed to be set up in the automobile body, rotation unit installs in the lift portion, the cable is set up in rotation unit, and cable one end is connected with the electrical components of fork, the other end is connected with the electric cabinet of automobile body, the lift portion can drive the cable and move along with the motion of fork, compared with the prior art, when the lift portion goes up and down relative installation department, so that the lift portion drives rotation unit to go up and down, thereby make the cable that walks around rotation unit move along with the motion of lift portion, in order to avoid the cable to be dragged, cause the cable to break and the problem of blocking, the cable can be stably connected into the electric cabinet body.

Description

Unmanned carrying vehicle

Technical Field

The utility model relates to a commodity circulation transportation field especially relates to an unmanned transport vehicle.

Background

With the development of industrial automation and intelligence, Automatic Guided Vehicles (AGVs) are increasingly widely used in the field of logistics transportation. The AGV can be controlled by the platform control system to realize actions such as automatic driving, loading, transporting, unloading, obstacle avoidance and the like without manual intervention. The AGV can replace manual work to complete a large amount of material handling work, and meanwhile, the continuous work for 24 hours can be realized, so that the labor cost of an enterprise can be effectively reduced; the AGV executes a preset program, so that the condition of material delivery errors is effectively reduced; for some environment conditions (strong current, strong magnetism, chemical engineering, spraying workshops and the like) which are not suitable for manual work, the AGV can replace manual work to finish material transferring work.

The fork assembly is provided with electronic components such as a sensor and the like, and the electronic components are electrically connected with an electric control box in the vehicle body through cables. However, since the fork assembly is movable up and down relative to the vehicle body, the cable connected between the electronic component and the electric cabinet is dragged, which may cause the cable to be broken and blocked.

SUMMERY OF THE UTILITY MODEL

The utility model provides a pair of unmanned carrying vehicle for the cable of connection between electronic parts and electric cabinet can be dragged among the solution prior art, can cause the cable to break and block the technical problem who hinders.

In order to solve the technical problem, the utility model discloses a following technical scheme:

the utility model provides an unmanned carrying vehicle, includes automobile body and fork, the fork install in on the automobile body, and can reciprocate along vertical axis direction on the automobile body, unmanned carrying vehicle still includes jacking piece, rotation unit and cable, jacking piece includes the installation department and can be relative the lift portion that the installation department goes up and down, the installation department is fixed set up in the automobile body, rotation unit install in lift portion, the cable is set up in rotation unit, just cable one end with the electrical components of fork is connected, the other end with the electric cabinet of automobile body is connected, lift portion can drive the cable along with the motion of fork and motion.

In one embodiment, the automated guided vehicle further includes a stopper unit mounted to the vehicle body for preventing the cable from being separated from the electrical cabinet.

In one embodiment, the limiting unit comprises an installation seat and a locking piece, the installation seat is installed on the vehicle body and is provided with an avoiding hole for the cable to pass through, and the locking piece is locked on the cable and is in contact fit with the installation seat.

In one embodiment, the limiting unit further includes an elastic sheet, the elastic sheet is mounted on the mounting seat and provided with a through hole for the cable to move, and the locking member is in contact fit with the elastic sheet.

In one embodiment, the turning unit comprises a turning wheel rotatable about a horizontal axis, the turning wheel cooperating with the cable.

In one embodiment, the automated guided vehicle further comprises a laser navigator mounted to the vehicle body.

In one embodiment, the automated guided vehicle further includes a protection unit mounted to the vehicle body and configured to protect the laser navigator.

In one embodiment, the protection unit comprises a protection cover and a fixing unit, the protection cover is rotatably installed on the vehicle body, the fixing unit is installed on the vehicle body and can fix the protection cover, and the protection cover covers the circumference of the laser navigator when being separated from the fixing unit.

In one embodiment, the protection unit further includes a detection sensor and a controller, the detection sensor is respectively in communication connection with the controller and the fixing unit, the detection sensor sends a received detection signal to the controller, the controller receives the detection signal and processes the detection signal, and the controller controls the fixing unit according to the processed detection signal.

In one embodiment, the automated guided vehicle further comprises a transmission member, the rotating unit further comprises a transmission wheel capable of rotating around a horizontal axis, the transmission member is erected on the transmission wheel, one end of the transmission member is connected with the vehicle body, the other end of the transmission member is connected with the fork, and the jacking member drives the fork to move up and down along the vertical axis direction by lifting the transmission member.

Compared with the prior art, the utility model provides a pair of unmanned carrying vehicle has following advantage:

when the relative installation department of lift portion goes up and down, lift portion can drive the rotation unit and go up and down to the cable that the rotation unit was walked around in the messenger moves along with the motion of lift portion, in order to avoid the cable can be pulled, causes the problem that the cable broke and block and hinder, can make the cable stably plug into the electric cabinet internally.

Drawings

The following drawings are only for the purpose of enabling those skilled in the art to better understand the technical solution of the present invention, and are not intended to limit the present invention, and other drawings can be obtained by those skilled in the art according to the technical solution of the present invention.

Fig. 1 is a first schematic structural view of an automated guided vehicle according to an embodiment of the present invention;

fig. 2 is a second schematic structural view of an automated guided vehicle according to an embodiment of the present invention;

FIG. 3 is an enlarged view of portion A of FIG. 2;

FIG. 4 is a schematic view of a portion of the automated guided vehicle shown in FIG. 1;

fig. 5 is a third schematic structural view of an automated guided vehicle according to an embodiment of the present invention;

fig. 6 is a fourth schematic structural view of the automated guided vehicle according to an embodiment of the present invention;

fig. 7 is a block diagram of a control system of the automated guided vehicle.

Description of reference numerals:

100. an automated guided vehicle; 101. a laser navigator; 102. an electric cabinet; 103. a detection sensor; 104. a controller; 10. a vehicle body; 11. laser fixing piece; 12. a sensing fixture; 13. an electromagnetic support; 20. a pallet fork; 21. a fork leg; 30. a jacking piece; 31. an installation part; 32. a lifting part; 33. a connecting shaft; 40. a rotating unit; 41. a rotating wheel; 411. rotating the groove; 42. a driving wheel; 50. a cable; 60. a limiting unit; 61. a mounting seat; 611. avoiding holes; 62. a locking member; 63. a spring plate; 70. a protection unit; 71. a protective cover; 72. a fixing unit; 721. an electromagnet; 80. a transmission member; 90. a guide assembly; 91. a guide rail; 92. a slider.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

For a better description and illustration of embodiments of the application, reference may be made to one or more of the drawings, but additional details or examples for describing the drawings should not be construed as limiting the scope of any of the inventive concepts of the present application, the presently described embodiments, or the preferred versions.

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 a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components 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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 to 4, the present invention provides an automated guided vehicle 100, wherein the automated guided vehicle 100 is applied to a work site (not shown) of a logistics system, and the automated guided vehicle 100 can walk on the ground of the work site and consign/transport goods to a predetermined position of the work site.

The automated guided vehicle 100 includes a movable vehicle body 10, and a fork 20 that can move up and down in a vertical axis direction is provided on the vehicle body 10. Wherein the forks 20 comprise two parallel arranged fork legs 21, the goods are placed on a pallet (not shown), the forks 20 will the pallet be shipped/transported to the predetermined position of the work site, and the transport of the pallet on the ground can be realized.

As shown in fig. 1 to 4, the automated guided vehicle 100 further includes a jacking member 30, a rotating unit 40 and a cable 50, the jacking member 30 includes an installation portion 31 and a lifting portion 32 that can be lifted relative to the installation portion 31, the installation portion 31 is fixedly disposed on the vehicle body 10, the rotating unit 40 is installed on the lifting portion 32, the cable 50 is installed on the rotating unit 40, one end of the cable 50 is connected to an electrical component (not shown) of the fork 20, the other end of the cable is connected to the electric cabinet 102 of the vehicle body 10, and the lifting portion 32 can drive the cable 50 to move along with the movement of the fork 20.

It is understood that the electrical components are electrically connected to the electrical cabinet 102 by the cable 50. When the relative installation department 31 of lift portion 32 goes up and down, lift portion 32 can drive the unit 40 that rotates and rise to the messenger moves along with the motion of lift portion 32 around the cable 50 of unit 40 that rotates, in order to avoid cable 50 can be dragged, causes the problem that cable 50 broke and blocked, can make cable 50 stably plug into electric cabinet 102 internally.

In this embodiment, the jack 30 is a cylinder including a cylinder body and a piston rod that can reciprocate in the cylinder body, the mounting portion 31 is the cylinder body, and the elevating portion 32 is the piston rod. Of course, in other embodiments, the lifting member 30 may be a cylinder or other driving element as long as the driving element can make the fork 20 perform the lifting motion.

Further, as shown in fig. 3, the automated guided vehicle 100 further includes a stopper unit 60, and the stopper unit 60 is mounted to the vehicle body 10 to prevent the cable 50 from being detached from the electric cabinet 102.

It can be understood that when the lifting portion 32 is lifted relative to the mounting portion 31, due to the uncertainty of the rolling direction of the rotating unit 40, it may happen that the cable 50 near the side of the vehicle body 10 is pulled outward (i.e., pulled toward the pallet fork 20), which may cause the cable 50 in the electric cabinet 102 of the vehicle body 10 to be pulled apart or the cable 50 to be pulled to cause a lifting jam, and then the cable 50 is damaged. The cable 50 close to the side of the car body 10 is prevented from being pulled outwards (i.e., pulled towards the direction of the fork 20) by the limiting unit 60, so that the cable 50 in the electric cabinet 102 of the car body 10 can be prevented from being broken or pulled, and the lifting part 32 is prevented from being lifted and blocked and then the cable 50 is prevented from being damaged. When the lifting portion 32 is lowered relative to the mounting portion 31, the cable 50 will naturally roll back to the position of the forks 20 because the cable 50 is in a taut, relaxed state.

Further, as shown in fig. 3, the limiting unit 60 includes an installation seat 61 and a locking member 62, the installation seat 61 is installed on the vehicle body 10, and is provided with an avoiding hole 611 for the cable 50 to pass through, and the locking member 62 is locked on the cable 50 and is in contact fit with the installation seat 61.

It can be understood that, when the cable 50 near the side of the vehicle body 10 is pulled outward (i.e., pulled toward the fork 20), and the locking member 62 on the cable 50 reaches the position of the mounting seat 61, the locking member 62 will abut against the mounting seat 61 to prevent the cable 50 from being pulled outward (i.e., pulled toward the fork 20), so that the cable 50 in the electric cabinet 102 of the vehicle body 10 can be prevented from being pulled apart or the cable 50 is pulled, the lifting portion 32 is prevented from being lifted and blocked, and the cable 50 is damaged.

Further, as shown in fig. 3, the limiting unit 60 further includes an elastic sheet 63, the elastic sheet 63 is mounted on the mounting seat 61 and is provided with a through hole for the cable 50 to move, and the locking member 62 is in contact fit with the elastic sheet 63.

It can be understood that, when the cable 50 near the side of the vehicle body 10 is pulled outwards (i.e. pulled towards the direction of the fork 20), the locking member 62 on the cable 50 can abut against the elastic sheet 63, the locking member 62 compresses the elastic sheet 63, so that the elastic sheet 63 deforms to generate force, the cable 50 can be pulled towards the side of the vehicle body 10, the rolling direction of the rotating unit 40 is changed to be oriented, the length part of the cable 50 at the side of the fork 20 is pulled towards the side part of the vehicle body 10, and the stability of the cable 50 at the side of the vehicle body 10 is ensured, and the cable 50 is not pulled or broken.

In the present embodiment, the elastic sheet 63 is in an arch shape, the elastic sheet 63 has elasticity, and the through hole is formed in the middle of the elastic sheet 63.

Further, as shown in fig. 4, the rotating unit 40 includes a rotating wheel 41 rotatable about a horizontal axis, and the rotating wheel 41 is engaged with the cable 50.

It will be appreciated that the turning wheels 41 can reduce the friction between the cable 50 and the jack 30. The rotating wheel 41 is provided with a rotating slot 411 matched with the cable 50, and the rotating slot 411 can prevent the cable 50 from being separated from the rotating wheel 41.

Specifically, the mounting seat 61 is fixed on the vehicle body 10, the middle of the mounting seat 61 is provided with an avoiding hole 611 for allowing the cable 50 to pass through, and the avoiding hole is not in contact with the cable 50, the cable 50 passes through the through hole of the elastic piece 63, the locking piece 62 clamps the cable 50 under the elastic piece 63 under the action of the locking piece 62, when the cable 50 is pulled upwards, the cable 50 drives the locking piece 62 to ascend, the locking piece 62 presses the elastic piece 63, the elastic piece 63 deforms, the elastic piece 63 generates deformation force, and the cable 50 is pulled towards the vehicle body 10 again.

Further, as shown in fig. 4, the automated guided vehicle 100 further includes a transmission member 80, the rotating unit 40 further includes a transmission wheel 42 capable of rotating around a horizontal axis, the transmission member 80 is overlapped on the transmission wheel 42, one end of the transmission member 80 is connected to the vehicle body 10, the other end of the transmission member 80 is connected to the fork 20, and the jacking member 30 drives the fork 20 to move up and down along a vertical axis direction by lifting the transmission member 80.

It is understood that the transmission member 80 is a flexible member, one end of the transmission member 80 is fixedly connected to the vehicle body 10 through a fixing bolt, the other end is fixedly connected to the fork 20, and the cable 50 moves synchronously with the transmission member 80. The jacking member 30 jacks to drive the transmission member 80, so that the whole fork 20 is driven to move up and down along the vertical axis direction, the fork 20 is lifted stably, and the pallet placed on the fork 20 can be lifted and placed stably. The driving wheel 42 can reduce the friction between the driving member 80 and the jacking member 30, so that the driving member 80 can be jacked up by the jacking member 30 more easily, and the service life of the driving member 80 is prolonged.

The number of the driving wheels 42 is two, the two driving wheels 42 are correspondingly installed on two opposite sides of the jacking piece 30 one by one, the number of the driving pieces 80 is two, and the driving pieces 80 are respectively connected with the corresponding driving wheels 42. The two drive wheels 42 are able to distribute the force of the forks 20.

In this embodiment, the transmission member 80 is a jacking chain. Of course, in other embodiments, the transmission member 80 may be other transmission members 80 besides the jacking chain.

Preferably, the driving wheel 42 is a sprocket wheel, and the driving member 80 is a chain capable of cooperating with the driving wheel 42.

It will be appreciated that the sprocket wheel can reduce the friction between the drive member 80 and the jacking members 30. Wherein, the quantity of sprocket is two, and two sprockets are installed in the relative both sides of lift portion 32 of jacking piece 30, and the quantity of driving medium 80 is two, and driving medium 80 is connected with the sprocket that corresponds respectively. The two sprockets can distribute the force of the forks 20 against the jacking members 30.

Specifically, the chain wheel is provided with a bearing (not shown), the jacking piece 30 is provided with a connecting shaft 33, the axis of the connecting shaft 33 is perpendicular to the axis of the jacking piece 30, and the chain wheel is arranged at two ends of the connecting shaft 33 through the bearing.

In this embodiment, the sprocket is a toothless sprocket, and the jacking chain is engaged with the toothless sprocket to prevent the transmission member 80 from being separated from the sprocket. Of course, in other embodiments, the sprocket may be other rotating elements than a toothless sprocket.

Further, as shown in fig. 1, 2 and 3, a guide assembly 90 is disposed on the vehicle body 10, and the fork 20 is connected to the guide assembly 90 and can move along the guide assembly 90.

It will be appreciated that when the forks 20 move up and down along the vertical axis on the vehicle body 10, the movement of the forks 20 relative to the vehicle body 10 can be guided by the guide assembly 90, and the guide assembly 90 moves the forks 20 in a fixed direction to limit the movement direction of the forks 20.

Preferably, the guide assembly 90 includes a guide rail 91 and a slider 92 engaged with the guide rail 91, the slider 92 being mounted on the fork 20, the guide rail 91 being mounted on the vehicle body 10.

It will be appreciated that the slider 92 is capable of reciprocating along the guide rail 91, causing the forks 20 to move in a fixed direction on the body 10. The movement direction of the fork 20 is limited through the matching of the sliding part 92 and the guide rail 91, the fork can only move along the direction of the guide rail 91, and the jacking power comes from the jacking part 30, so that the phenomenon that the goods incline in the lifting process is avoided.

The number of the sliding parts 92 is two, the number of the guide rails 91 is two, the two sliding parts 92 are respectively and correspondingly arranged on the guide rails 91, and the pallet fork 20 is provided with a fixing plate for mounting the sliding parts 92.

Of course, in other embodiments, the slider 92 is mounted to the body 10 and the rails 91 are mounted to the forks 20.

Preferably, the sliding member 92 includes at least two rollers, and the two rollers are mounted on the fork 20 or the body 10 at intervals, and the guide rail 91 is provided with a sliding groove (not shown) engaged with the rollers.

It will be appreciated that the guide rail 91 limits the movement of the forks 20 by limiting the rollers, ensuring that the movement path of the forks 20 is along a vertical axis during lifting. The rollers reduce the friction with the rail 91, making it more convenient for the forks 20 to move up and down along the vertical axis.

As shown in fig. 5 and 6, the automated guided vehicle 100 further includes a laser navigator 101 attached to the vehicle body 10.

It can be understood that the vehicle body 10 is provided with the laser fixing member 11, the laser navigator 101 is fixed on the laser fixing member 11, the laser navigator 101 realizes real-time positioning, navigation and obstacle avoidance work of the automated guided vehicle 100 in a working area thereof, and other positioning facilities are not needed on the ground; the driving path of the automated guided vehicle 100 can be flexible and changeable, and can be suitable for various field environments.

As shown in fig. 5 and 6, the automated guided vehicle 100 further includes a protection unit 70, and the protection unit 70 is mounted on the vehicle body 10 and is used for protecting the laser navigator 101.

It will be appreciated that the protection unit 70 does not trigger a sensor transmission scan that is not protected and does not affect the navigation laser for collision avoidance protection of the navigation laser, triggering immediate activation of the protection. The protection unit 70 can play a role of mechanical collision avoidance protection for the laser navigator 101.

Preferably, the protection unit 70 includes a protection cover 71 and a fixing unit 72, the protection cover 71 is rotatably mounted on the vehicle body 10, the fixing unit 72 is mounted on the vehicle body 10 and can fix the protection cover 71, and the protection cover 71 covers the laser navigator 101 in the circumferential direction when being separated from the fixing unit 72.

It will be appreciated that the laser navigator 101 region is detected for the entry of an obstacle. If an obstacle is detected to enter the laser navigator 101 area, the protective cover 71 is separated from the fixing unit 72, the protective cover 71 rotates relative to the vehicle body 10, and finally the protective cover 71 covers the whole laser navigator 101, so that a mechanical collision avoidance effect is generated.

The fixing unit 72 includes an electromagnet 721, and the electromagnet 721 is mounted on the vehicle body 10 and can be magnetically connected to the protective cover 71.

It is understood that the electromagnet 721 is fixed to the vehicle body 10 or the laser fixing member 11 through the electromagnetic bracket 13. When no obstacle is detected to enter, the electromagnet 721 is electrified to generate magnetic force to suck the protective cover 71, so that the protective cover 71 is prevented from being put down (when the protective cover 71 is installed, the horizontal plane included angle between the protective cover 71 and the laser direction of the laser navigator 101 is smaller than 90 degrees, namely when no electromagnet 721 is arranged, the protective cover can freely fall down), when the obstacle is detected to suddenly enter, the electromagnet 721 is powered off to lose the magnetic force, the protective cover 71 falls down to cover the whole laser navigator 101, and a mechanical anti-collision effect is generated.

Further, as shown in fig. 7, the protection unit 70 further includes a detection sensor 103 and a controller 104, the detection sensor 103 is respectively connected to the controller 104 and the fixing unit 72 in a communication manner, the detection sensor 103 sends a received detection signal to the controller 104, the controller 104 receives the detection signal and processes the detection signal, and the controller 104 controls the fixing unit 72 according to the processed detection signal.

It is understood that the detection sensor 103 is mounted to the laser mount 11 of the vehicle body 10 via the sensor mount 12. Whether the detection sensor 103 detects an obstacle. If the detection sensor 103 detects an obstacle, an obstacle signal is sent to the controller 104, the controller 104 processes the received obstacle signal, and controls the electromagnet 721 to be powered off according to the processed obstacle signal, so that the protective cover 71 protects the laser navigator 101.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides an unmanned carrying vehicle, includes automobile body and fork, the fork install in on the automobile body, and can reciprocate along vertical axis direction on the automobile body, its characterized in that, unmanned carrying vehicle still includes jacking piece, rotation unit and cable, jacking piece includes the installation department and can be relative the lift portion that the installation department goes up and down, the installation department is fixed set up in the automobile body, the rotation unit install in lift portion, the cable is set up in the rotation unit, just cable one end with the electrical components of fork is connected, the other end with the electric cabinet of automobile body is connected, lift portion can drive the cable along with the motion of fork and motion.

2. The automated guided vehicle of claim 1, further comprising a stop unit mounted to the vehicle body for preventing the cable from being disengaged from the electrical cabinet.

3. The automated guided vehicle according to claim 2, wherein the stopper unit includes a mounting seat and a locking member, the mounting seat is mounted on the vehicle body and has an avoiding hole for the cable to pass through, and the locking member is locked to the cable and is in contact fit with the mounting seat.

4. The automated guided vehicle of claim 3, wherein the positioning unit further comprises a resilient plate, the resilient plate is mounted on the mounting seat and defines a through hole for the cable to move, and the locking member is in contact with the resilient plate.

5. The automated guided vehicle of any one of claims 1-4, wherein the rotating unit comprises a rotating wheel rotatable about a horizontal axis, the rotating wheel cooperating with the cable.

6. The automated guided vehicle of claim 1, further comprising a laser navigator mounted to the vehicle body.

7. The automated guided vehicle of claim 6, further comprising a guard unit mounted to the vehicle body and configured to guard the laser navigator.

8. The automated guided vehicle according to claim 7, wherein the guard unit includes a guard rotatably mounted to the vehicle body, and a fixing unit mounted to the vehicle body and capable of fixing the guard, and the guard is provided so as to cover the laser navigator in a circumferential direction when detached from the fixing unit.

9. The automated guided vehicle of claim 8, wherein the guard unit further comprises a detection sensor and a controller, the detection sensor is in communication with the controller and the fixed unit, the detection sensor transmits a received detection signal to the controller, the controller receives the detection signal and processes the detection signal, and the controller controls the fixed unit according to the processed detection signal.

10. The automated guided vehicle of claim 1, wherein the automated guided vehicle further comprises a transmission member, the rotating unit further comprises a transmission wheel capable of rotating around a horizontal axis, the transmission member is disposed on the transmission wheel, one end of the transmission member is connected to the vehicle body, the other end of the transmission member is connected to the fork, and the jacking member drives the fork to move up and down along a vertical axis by lifting the transmission member.