CN211032304U

CN211032304U - Transmission equipment and van-type vehicle

Info

Publication number: CN211032304U
Application number: CN201921791072.7U
Authority: CN
Inventors: 林冬烁
Original assignee: SF Technology Co Ltd
Current assignee: SF Technology Co Ltd; SF Tech Co Ltd
Priority date: 2019-10-23
Filing date: 2019-10-23
Publication date: 2020-07-17
Anticipated expiration: 2029-10-23

Abstract

The embodiment of the utility model discloses a transmission equipment and van-type vehicle, this transmission equipment includes support, drive arrangement, first bearing roller, second bearing roller and annular track, the both ends of first bearing roller and second bearing roller are connected with the support rotation; the output end of the driving device is connected with one end of the first carrier roller so as to drive the first carrier roller to rotate; the first carrier roller drives the second carrier roller to rotate through the annular crawler; wherein, endless track includes two at least track sections, can dismantle between two at least track sections and connect. The utility model discloses transmission equipment's annular track includes two at least track sections, and two at least track sections can be dismantled the connection to when one of them track section damages, annular track still can use, can not cause the unable work of transmission equipment, and, only need when restoreing annular track with the track section replacement of damage can, improved transmission equipment's life.

Description

Transmission equipment and van-type vehicle

Technical Field

The utility model relates to a transmission technical field, concretely relates to transmission and van vehicle.

Background

In the field of logistics, a large number of van trucks with doors at the tail are used for transporting goods. The goods are usually placed on pallets for transfer. Usually transport the goods to the carriage afterbody earlier with fork truck, then utilize artifical or hydraulic pressure car to send the goods to carriage inside and put, perhaps utilize fork truck to promote tray or equipment, push away the goods in the carriage. The boxcar is narrow, which is not beneficial to the movement of workers, and the manpower is required to be increased, so that the labor cost is increased; the goods are easy to damage by being pushed by a forklift. When the goods get on or off the vehicle, people need to climb into the carriage to move the goods, and particularly, people can slip easily when getting on or off the tail carriage in rainy days, so that the process is dangerous. Although the prior art has the problem that the transmission equipment is arranged in the carriage for loading or unloading, the transmission equipment cannot continue to work when the transmission equipment is partially damaged.

That is, in the prior art, when the transmission equipment is partially damaged, the whole transmission equipment cannot be used, the failure rate of the transmission equipment is high, and the service life of the transmission equipment is shortened.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an in provide a transmission and van vehicle can still can use when transmission local damage, can reduce transmission's fault rate, improves transmission's life.

On one hand, the utility model provides a transmission device, which comprises a bracket, a driving device, a first supporting roller, a second supporting roller and an annular crawler belt,

two ends of the first carrier roller and the second carrier roller are rotatably connected with the bracket;

the output end of the driving device is connected with one end of the first carrier roller so as to drive the first carrier roller to rotate;

the first carrier roller and the second carrier roller are wound by the annular crawler belt, and the first carrier roller drives the second carrier roller to rotate through the annular crawler belt;

wherein, endless track includes two at least track sections, can dismantle the connection between two at least track sections.

The annular crawler comprises hinge screw rods, hinge teeth are arranged on two sides of each crawler section, through holes are formed in the hinge teeth, the hinge teeth on two adjacent crawler sections are mutually meshed, and the hinge screw rods penetrate through the through holes of the hinge teeth, so that the two adjacent crawler sections are rotatably connected.

The inner surface of the track section is provided with a tooth groove, the side wall of the first carrier roller is provided with a rack, the rack is matched with the tooth groove, and when the first carrier roller rotates, the annular track is driven to rotate.

The transmission equipment comprises a supporting plate, the supporting plate is fixed on the support and located inside the annular crawler, and the top surface of the supporting plate is attached to the inner surface of the upper portion of the annular crawler to support the annular crawler.

The crawler belt comprises a crawler belt section, a roller cavity, a roller, a supporting plate and a roller, wherein the crawler belt section is provided with the roller cavity, an opening of the roller cavity is positioned on the inner surface of the crawler belt section, the roller is arranged in the roller cavity, the roller is rotatably connected with the side wall of the roller cavity, and the side wall of the roller protrudes out of the opening of the roller cavity so as to roll on the supporting plate.

The transmission equipment comprises a supporting carrier roller and a sliding base, wherein the sliding base is positioned on two sides of the support, the sliding base can move up and down relative to the support, two ends of the supporting carrier roller are respectively connected with the sliding base in a rotating mode, and the supporting carrier roller is positioned on the outer side of the annular crawler and positioned at the bottom of the annular crawler.

Wherein, first bearing roller with the second bearing roller is located the top of support, drive arrangement is fixed in the bottom of support, drive arrangement includes the motor, the output of motor is equipped with first belt pulley, the one end of first bearing roller is equipped with the second belt pulley, and the winding has the belt on first belt pulley and the second belt pulley, the motor passes through first belt pulley, belt the second belt pulley drives first bearing roller rotates.

And a baffle is arranged on one side of the first carrier roller, which is far away from the second carrier roller, the baffle is fixed on the bracket, and the baffle is higher than the annular track.

On the other hand, the utility model provides a van, van includes the carriage, carriage inboard bottom is provided with foretell transmission.

The van vehicle comprises a cab, a display screen and a controller are arranged in the cab, the controller is coupled with the driving device to control the driving device, a camera device is arranged at the top of the inner side of the cab, the camera device is coupled with the display screen, a control box is arranged on the outer side of the cab, and the control box is coupled with the driving device to control the driving device.

The embodiment of the utility model provides a transmission device, which comprises a bracket, a driving device, a first carrier roller, a second carrier roller and an annular crawler belt, wherein both ends of the first carrier roller and the second carrier roller are rotatably connected with the bracket; the output end of the driving device is connected with one end of the first carrier roller so as to drive the first carrier roller to rotate; the first carrier roller drives the second carrier roller to rotate through the annular crawler; wherein, endless track includes two at least track sections, can dismantle between two at least track sections and connect. The utility model discloses transmission equipment fault rate among the prior art is higher, under the lower condition of life, creatively provided a transmission equipment, transmission equipment's annular track includes two at least track sections, and two at least track sections can be dismantled the connection to when one of them track section damages, annular track still can use, can not cause the unable work of transmission equipment, and, only need when restoreing annular track can with the track section replacement of damage, improved transmission equipment's life.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of a transmission device provided by an embodiment of the present invention;

FIG. 2 is a schematic block diagram of region A of the transmission of FIG. 1;

FIG. 3 is a schematic illustration of a track link of the transmission of FIG. 1;

fig. 4 is a schematic structural diagram of an embodiment of a van vehicle according to an embodiment of the present invention;

fig. 5 is a schematic circuit structure diagram of the van vehicle in fig. 4.

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 those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the invention. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known structures and processes are not shown in detail to avoid obscuring the description of the invention with unnecessary detail. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

The embodiment of the utility model provides a transmission device, which comprises a bracket, a driving device, a first carrier roller, a second carrier roller and an annular crawler belt, wherein both ends of the first carrier roller and the second carrier roller are rotatably connected with the bracket; the output end of the driving device is connected with one end of the first carrier roller so as to drive the first carrier roller to rotate; the first carrier roller drives the second carrier roller to rotate through the annular crawler; wherein, endless track includes two at least track sections, can dismantle between two at least track sections and connect. The following are detailed below.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a transmission device according to an embodiment of the present invention; FIG. 2 is a schematic block diagram of region A of the transmission of FIG. 1; FIG. 3 is a schematic diagram of a track link of the transmission of FIG. 1.

With reference to fig. 1-3, in the embodiment of the present invention, the transmission device 10 includes a bracket 10, a driving device 14, a first idler 12, a second idler 13, and an endless track 15. The support 10 may be a three-dimensional frame. The support 10 is a frame structure, which can reduce the weight of the transmission device 10. The two ends of the first carrier roller 12 and the second carrier roller 13 are rotatably connected with the bracket 10. The embodiment of the utility model provides an in, annular track 15 twines in first bearing roller 12 and second bearing roller 13, and first bearing roller 12 passes through annular track 15 and drives second bearing roller 13 and rotate. Wherein, the endless track 15 comprises at least two track sections 150, and the at least two track sections 150 are detachably connected with each other. The endless track 15 of the transmission device 10 includes at least two track sections 150, and the at least two track sections 150 are detachably connected, so that when one track section 150 is damaged, the endless track 150 can still be used, the transmission device 10 cannot be disabled, and only the damaged track section 150 needs to be replaced when the endless track 15 is repaired, thereby prolonging the service life of the transmission device 10.

In a specific embodiment, both ends of the first idler 12 and the second idler 13 are respectively rotatably connected with the bracket 10 through self-aligning bearings. The roller ball track is spherical, and the bearing capable of adapting to angular deviation between two ball track axis lines is the self-aligning bearing. When the first carrier roller 12 and the second carrier roller 13 of the aligning bearing deflect in the axial direction, the aligning bearing can automatically align without increasing the bearing load, reduce the loss of the bearing and ensure the normal work of the transmission equipment 10.

In the embodiment of the present invention, the transmission device 10 includes a supporting plate 16, and the supporting plate 16 is fixed on the bracket 10. A support plate 16 is positioned inside the endless track 15, and a top surface of the support plate 16 is attached to an upper inner surface of the endless track 15 to support the endless track 15. When the annular crawler 15 carries out cargo transportation, the supporting plate 16 is used for bearing the self weight of the cargo, the annular crawler 15 does not need to bear the vertical gravity of the cargo, and the situation that the annular crawler 15 is broken by pressure can be avoided. Moreover, the rotation of the endless track 15 only needs to overcome the friction between the endless track and the support plate 16, which can reduce the resistance of the endless track 15 during rotation and reduce the energy consumption of the transmission apparatus 10. Preferably, the top surface of the supporting plate 16 is a plane, and the top surface of the supporting plate 16 is a plane, so that the bearing surface of the endless track 15 is relatively flat, and the bumping of goods is reduced.

The embodiment of the utility model provides an in, annular track 15 includes hinge lead screw (not shown), and the both sides of track festival 150 are equipped with hinge tooth 151, are equipped with the through-hole on the hinge tooth 151, and the mutual interlock of hinge tooth 151 on two adjacent track festival 150, hinge lead screw run through the through-hole of hinge tooth 151 to make two adjacent track festival 150 rotate and connect. In other embodiments, two adjacent track links 150 may be connected by hinges. Because the track sections 150 are rotatably connected, the endless track 15 may be made of a rigid material, for example, the endless track 15 may be made of a high-strength plastic or metal, and the rigid material is not easily deformed, so that the reduction of the transmission efficiency of the endless track 15 may be avoided, and the rigid material has a high strength and is capable of carrying heavy goods. Of course, in other embodiments, the endless track 15 may be made of a flexible material, which is not limited by the present invention.

The embodiment of the utility model provides an in, the internal surface of track section 150 is equipped with tooth's socket 152, and the lateral wall of first bearing roller 12 is equipped with rack 122, and rack 122 cooperates with tooth's socket 152, when first bearing roller 12 rotates, drives annular track 15 and rotates. When the first idler roller 12 rotates, the rack 122 on the first idler roller 12 makes a circular motion around the axis of the first idler roller 12, and when the rack 122 rotates to be embedded into the tooth groove 152 on the endless track 15, the endless track 15 is driven to rotate. Through the cooperation of the rack 122 and the tooth grooves 152, the occurrence of slippage between the endless track 15 and the first and

second idlers

12 and 13 when the endless track 15 is loaded with heavy objects can be avoided.

In the embodiment of the present invention, a roller cavity 153 is disposed on the track section 150, an opening of the roller cavity 153 is disposed on the inner surface of the track section 150, a roller 154 is disposed in the roller cavity 153, the roller 154 is rotatably connected to the sidewall of the roller cavity 153, and the sidewall of the roller 154 protrudes out of the opening of the roller cavity 153 to roll on the support plate 16. In a specific embodiment, the roller 154 includes a roller and a roller, the roller is sleeved on the roller, the roller is rotatably connected with the roller, and two ends of the roller are fixed on the side wall of the roller cavity 153 by screwing, riveting, clamping, and the like. The number of the roller cavities 153 may be 1, 2 or more, which is not limited by the present invention. When the endless track 15 slides on the support plate 16, the friction between the endless track 15 and the support plate 16 is rolling friction, and the resistance when the endless track 15 slides on the support plate 16 can be effectively reduced.

The embodiment of the utility model provides an in, transmission equipment 10 includes support roller 17 and sliding bottom (not shown), and sliding bottom is located the both sides of support 10, but sliding bottom relative support 10 carries out elevating movement, and support roller 17's both ends rotate with sliding bottom respectively to be connected, and support roller 17 is located the outside of annular track 15, and is located the bottom of annular track 15. Since the support rollers 17 can move up and down with respect to the frame 10, the endless track 15 can be tightened, and a reduction in transmission efficiency of the endless track 15 can be avoided. The supporting carrier roller 17 is rotatably connected with the sliding base, so that the supporting carrier roller 17 can rotate relative to the bracket 11, when the annular crawler 15 slides on the supporting carrier roller 17, rolling friction is formed between the supporting carrier roller 17 and the annular crawler 15, the friction is low, and the rotation resistance of the annular crawler 15 is reduced.

In a specific embodiment, a driving assembly (not shown) and a vertical sliding groove (not shown) are arranged on both sides of the support frame 10, the sliding base is embedded in the vertical sliding groove on the support frame 10, and the output end of the driving assembly is connected with the sliding base. The driving component can be any one of an air cylinder or a hydraulic cylinder, and the utility model discloses do not limit this. The output end of the driving component stretches and retracts to drive the sliding base to move up and down relative to the support 10, so that the supporting carrier roller 17 moves up and down.

In the embodiment of the present invention, the first supporting roller 12 and the second supporting roller 13 are located at the top of the bracket 10, and the driving device 14 is fixed at the bottom of the bracket 10. The driving device 14 includes a motor 141, an output end of the motor 141 is provided with a first belt pulley 143, one end of the first idler 12 is provided with a second belt pulley 121, the first belt pulley 143 and the second belt pulley 121 are wound with a belt 133, and the motor 141 drives the first idler 12 to rotate through the first belt pulley 143, the belt 133 and the second belt pulley 121. The motor 141 may be any one of a synchronous motor and a servo motor, and the present invention is not limited thereto. The driving device 14 is located at the bottom of the support 10, so that the disturbance of the driving device 14 to the support 10 during operation can be reduced, and the stability of the transmission device 10 can be improved.

Further, the driving device 14 further includes a reduction box 142, and the reduction box 142 is disposed on the output end of the motor 141. The reduction gearbox 142 is used to reduce the speed while increasing the output torque. By adjusting the reduction gearbox 142, the rotational speed and output torque of the endless track 15 can be adjusted to output different rotational speeds and torques for different goods being transported.

The embodiment of the utility model provides an in, one side that second bearing roller 13 was kept away from to first bearing roller 12 is equipped with baffle 111, and on baffle 111 was fixed in support 10, baffle 111 was higher than the height of annular track 15. The provision of the baffle 111 can prevent the cargo from falling off the endless track 15.

Further, the transmission device 10 further includes a limiting portion, and the limiting portion is disposed on the endless track 10. The limiting portion is a protrusion on the outer surface of the endless track 10. When the limiting part moves along with the annular crawler 15 to the end, close to the first carrier roller 12, of the annular crawler 15, the switch of the driving device 14 is triggered, the driving device 14 stops driving, and therefore the annular crawler 15 stops moving. Through setting up spacing portion, can make annular track 15 stop motion when spacing portion moves the tip of transmission equipment 10, avoid transmission equipment 10 excessive motion to make the goods on it drop.

Further, the stopper portion extends in a direction perpendicular to the rotation direction of the endless track 15. Be equipped with a plurality of infrared laser sensor in spacing portion, a plurality of infrared laser sensor arrange in proper order in spacing portion, and a plurality of infrared laser sensor are located the surface of annular track 15. When the staff goes on loading, if the goods surpassed infrared laser sensor, infrared laser sensor sent prompt message to make the staff adjust the goods gesture, thereby kept the goods just keep in spacing portion when loading.

The utility model also provides a van, van include the carriage, and the inboard bottom in carriage is provided with foretell transmission.

Further, fig. 4 is a schematic structural diagram of an embodiment of a van vehicle provided in the embodiment of the present invention; figure 5 is a schematic diagram of the electrical circuit structure of the van in figure 4,

with reference to fig. 4 and 5, in the embodiment of the present invention, the van-type vehicle 20 includes a cabin 22 and a cab 21, and the transmission device 10 is disposed at the bottom inside the cabin 22. The structure of the driving device 10 is please participate in the previous embodiment, and is not described herein. Specifically, the car 22 includes a car opening located aft of the car 22. The second idler 13 of the transmission device 10 is located at a carriage opening of the carriage 22, and the second idler 13 of the transmission device 10 is located at a side of the first idler 12 away from the cab 21. The second carrier roller 13 is positioned at the opening of the carriage, and the annular crawler belts 15 extend to the opening of the carriage, so that the second carrier roller is conveniently butted with an automatic assembly line, and the loading and unloading efficiency is improved. The transmission device 10 is installed inside the compartment 22 of the van-type vehicle 20, which can assist the manpower to automatically deliver the goods into the van-type vehicle 20, and reduce the operation time for manually transporting the goods. The transmission device 10 adopts a full-automatic loading, unloading and conveying mode, so that the danger possibly generated when workers carry goods can be reduced.

In the embodiment of the present invention, a display screen 211 and a controller 212 are disposed in the cab 21. The controller 212 is coupled to the driving device 14 to control the driving device 14, and a camera device is disposed on the top of the inner side of the car 22 and connected to the display screen 211.

Specifically, camera device includes first camera 221 and second camera 222, and first camera 221 is fixed in the top one corner of carriage 22, and second camera 222 is fixed in the other corner of top of carriage 22, shoots the monitoring through two cameras to carriage 22 inside, can be to avoiding the inside dead angle that appears of carriage 22. The image pickup device picks up the highlight and transmits the picked-up image to the display 211. The worker can observe the inside of the vehicle compartment 22 through the display screen 211 inside the cab 21 and then operate the controller 212. The controller 212 may be a pull rod, a button, or the like. For example, the controller 212 includes three buttons, namely a loading button, an unloading button and an emergency stop button, when the loading button is triggered, the driving device 14 drives the endless track 15 to rotate toward the inside of the car 22 for loading; when the discharge button is activated, the drive device 14 drives the endless track 15 to rotate outwardly of the car 22 for discharge. When the scram button is activated, the driving device 14 drives the endless track 15 to stop rotating.

The control box 224 is provided outside the vehicle 22, and the control box 224 is coupled to the driving device 14 to control the driving device 14. The control box 224 includes three buttons, a load button, a unload button, and an emergency stop button. A control box 224 is provided outside the vehicle compartment 22 for the operator to operate outside the vehicle. The dual control of the transmission 10 can improve the safety of the van 20.

Further, the van-type vehicle 20 further includes a battery 214, a distribution box 215, and an engine 213. The battery 214, the distribution box 215, and the engine 213 are connected to the controller 212 in the cab 21. The engine 213 drives a generator to provide a constant supply of power to the battery 214. The distribution box 215 distributes the electricity in the battery 214 to the drive unit 14. Thus, the power of the transmission 10 is provided by the van 20 without the need for an external power source.

Different from the prior art, the utility model provides a van vehicle, van vehicle includes the carriage, and the inboard bottom in carriage is provided with transmission equipment, and transmission equipment includes support, drive arrangement, first bearing roller, second bearing roller and annular track, and the both ends of first bearing roller and second bearing roller are connected with the support rotation; the output end of the driving device is connected with one end of the first carrier roller so as to drive the first carrier roller to rotate; the first carrier roller drives the second carrier roller to rotate through the annular crawler; wherein, endless track includes two at least track sections, can dismantle between two at least track sections and connect. The utility model discloses an annular track of transmission equipment includes two at least track sections, and two at least track sections can dismantle the connection to when one of them track section damages, annular track still can use, can not cause the unable work of transmission equipment, and, only need when restoreing annular track with the track section replacement of damage can, improved transmission equipment's life.

The transmission device and the van vehicle provided by the embodiment of the present invention are described in detail above, and the principle and the embodiment of the present invention are explained herein by applying a specific example, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be some changes in the specific embodiments and the application scope, and in summary, the content of the description should not be understood as a limitation to the present invention.

Claims

1. A transmission device is characterized by comprising a bracket, a driving device, a first carrier roller, a second carrier roller and an annular crawler belt,

2. The transmission apparatus according to claim 1, wherein the endless track includes a hinge screw, the track segments are provided with hinge teeth on both sides thereof, the hinge teeth are provided with through holes, the hinge teeth on two adjacent track segments are engaged with each other, and the hinge screw penetrates through the through holes of the hinge teeth to rotatably connect the two adjacent track segments.

3. The transmission apparatus of claim 1, wherein the inner surface of the track segments is provided with splines, and the side wall of the first idler is provided with a rack that engages the splines to rotate the endless track when the first idler is rotated.

4. The transmission apparatus of claim 1, comprising a support plate secured to the frame, the support plate being located inside the endless track, a top surface of the support plate engaging an upper inner surface of the endless track to support the endless track.

5. The transmission apparatus of claim 4, wherein the track link is provided with a roller cavity, the opening of the roller cavity is located on the inner surface of the track link, a roller is provided in the roller cavity, the roller is rotatably connected with the side wall of the roller cavity, and the side wall of the roller protrudes out of the opening of the roller cavity to roll on the support plate.

6. The transmission apparatus according to claim 1, wherein the transmission apparatus includes a support roller and a slide base, the slide base is located on both sides of the frame, the slide base can perform an elevating motion relative to the frame, both ends of the support roller are respectively rotatably connected to the slide base, and the support roller is located on an outer side of the endless track and on a bottom of the endless track.

7. The transmission equipment according to claim 1, wherein the first idler and the second idler are located at the top of the support, the driving device is fixed at the bottom of the support, the driving device comprises a motor, a first belt pulley is arranged at an output end of the motor, a second belt pulley is arranged at one end of the first idler, belts are wound on the first belt pulley and the second belt pulley, and the motor drives the first idler to rotate through the first belt pulley, the belts and the second belt pulley.

8. The transmission apparatus of claim 1, wherein a baffle is provided on a side of the first idler remote from the second idler, the baffle being secured to the frame, the baffle being higher than the endless track.

9. A van vehicle, characterized in that the van vehicle comprises a carriage, and the transmission device of any one of claims 1-8 is arranged at the bottom of the inner side of the carriage.

10. A van-type vehicle as claimed in claim 9, wherein the van-type vehicle comprises a cab, a display screen and a controller are arranged in the cab, the controller is coupled to the driving device to control the driving device, a camera device is arranged at the top of the inner side of the cab, the camera device is coupled to the display screen, and a control box is arranged at the outer side of the cab, and the control box is coupled to the driving device to control the driving device.