Battery carrying equipment

By designing a battery carrying equipment including fork plate components, robotic assembly and fire extinguishing device, the problem that existing equipment can only carry a single type of battery is solved, and diversified carrying of different types of batteries is achieved, and stability and safety are improved. sex.

CN222498595UActive Publication Date: 2025-02-18BEIJING FOTONDAIMLER AUTOMOTIVE
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Patent Information

Application Number
CN202420159355.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-01-23
Publication Date
2025-02-18
Estimated Expiration
2034-01-23

AI Technical Summary

Technical Problem

Existing battery-carrying equipment can only carry a single model of batteries, which are not widely applicable, have low carrying stability, and pose safety risks.

Method used

A battery carrying device including a carrier vehicle, a fork plate assembly, a robot assembly and a fire extinguishing device is designed. The fork plate assembly and the robot assembly are used to transport different models of batteries respectively. The robot assembly can grab batteries of special-shaped structures, the fork plate assembly can support batteries of conventional shapes, and the fire extinguishing device is used to prevent fire accidents.

Benefits of technology

It realizes diversified transportation of different models of batteries, improves carrying stability and safety, is convenient to operate and has high flexibility.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a battery carrying device which comprises a carrying cart, a battery pack, a battery pack, a battery pack, a battery pack, a battery pack and a battery pack. The fork plate assembly is installed on the chassis in a lifting mode and extends out of the outer side of the chassis, and the fork plate assembly is suitable for lifting a battery; the manipulator assembly is mounted on the chassis, and the manipulator assembly is suitable for grabbing the battery; the fire extinguishing device is installed on the side, back on to the fork plate assembly, of the chassis. According to the battery carrying equipment, batteries of different models can be carried, and the battery carrying equipment has the advantages of being diversified in carried battery type, good in stability, good in safety and the like.
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Description

Technical Field

[0001] The utility model relates to the technical field of battery replacement equipment, and in particular to a battery carrying equipment. Background Art

[0002] During the battery production process, the batteries need to be transported. Most of the batteries are transported manually, which is troublesome and laborious. In addition, the surface of the battery is relatively smooth. If the operation is not careful, it is easy to slip from the hand and cause injuries. In order to improve production efficiency and reduce labor intensity, some battery transport equipment is used for transportation during the operation of the battery.

[0003] The battery carrier in the related art can only carry a single type of battery, but each vehicle is of different sizes and is equipped with different types of batteries, such as round batteries or square batteries. The battery carrier can only carry a single battery, which is not widely applicable and has low carrying stability. Moreover, batteries are flammable objects that are prone to fire, posing a safety hazard. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery carrier, which can carry batteries of different models and has the advantages of carrying a variety of battery types, good stability, good safety, etc.

[0005] To achieve the above-mentioned purpose, according to an embodiment of the utility model, a battery transport device is proposed, including: a transport vehicle, which is constructed with a chassis and wheels; a fork plate assembly, which is liftably installed on the chassis and extends to the outside of the chassis, and the fork plate assembly is suitable for lifting the battery; a manipulator assembly, which is installed on the chassis, and the manipulator assembly is suitable for grabbing the battery; a fire extinguishing device, which is installed on the side of the chassis facing away from the fork plate assembly.

[0006] According to the battery transport device of the embodiment of the utility model, the fork plate assembly and the manipulator assembly are respectively controlled to transport batteries of different models. The fork plate assembly can transport some batteries of conventional shapes, and the batteries are stacked on the fork plate assembly for transportation. For some batteries with smooth surfaces and special-shaped structures, the stability of the battery during transportation can be guaranteed by grabbing them with the manipulator assembly. The fork plate assembly is forked and supported at the bottom of the battery. After the fork plate assembly lifts the battery, the carrier moves to transport the battery to the target position. The manipulator assembly grabs batteries of other models, and the battery transportation is more diverse and more flexible. Moreover, the manipulator assembly can also cooperate with the fork plate assembly to grab the battery and stack the grabbed battery with the battery supported by the fork plate assembly to ensure the stability of transportation. In addition, by constructing a fire extinguishing device, when a fire accident occurs in the battery or other components, it can be handled in time and the fire can be prevented from spreading, thereby ensuring the safety of the equipment and operators.

[0007] Therefore, the battery carrier 1 according to the embodiment of the utility model has the advantages of convenient operation, good flexibility and high safety.

[0008] According to some specific embodiments of the utility model, the fork plate assembly includes: a lifting frame, which is installed on the chassis and extends upward; a fork, which is installed on the lifting frame in a liftable manner, and the fork is suitable for being forked at the bottom of the battery to carry the battery; a fixing clamp, which is installed on the lifting frame in a liftable manner, and the fixing clamp is located above the fork and is suitable for clamping and fixing the battery on both sides.

[0009] According to some specific embodiments of the utility model, the fixing clamp includes: a cross bar, which is liftably installed on the lifting frame, the cross bar extends in a horizontal direction, the fork is connected to the bottom of the cross bar and is lifted and lowered together with the cross bar; a clamping arm, the clamping arm is installed on the cross bar and adjacent to both ends of the cross bar, and the clamping arm is suitable for clamping and fixing the battery.

[0010] According to some specific embodiments of the present utility model, the cross bar is configured with a slide groove extending along the length direction, and the clamping arm is movably installed in the slide groove to clamp and fix the battery.

[0011] According to some specific embodiments of the utility model, a pulley bracket is constructed on one side of the cross bar facing the lifting frame, and the pulley bracket is provided with a pulley; the lifting frame is constructed with a slide groove extending in a vertical direction, and the pulley is movably installed in the slide groove.

[0012] According to some specific embodiments of the present utility model, the wheel includes: a front wheel and a rear wheel, the diameter of the front wheel is larger than the diameter of the rear wheel, the fork plate assembly is installed on the side of the chassis facing the front wheel, and the manipulator assembly and the fire extinguishing device are installed on the side of the chassis adjacent to the rear wheel.

[0013] According to some specific embodiments of the present utility model, the fire extinguishing device includes: a water tank, which is installed on the chassis and located above the rear wheel; and a nozzle, which is connected to a side of the water tank facing away from the fork plate assembly.

[0014] According to some specific embodiments of the present utility model, a slide extending in a vertical direction is constructed on a side of the water tank facing away from the fork plate assembly, and the spray head can be installed on the slide in a liftable manner.

[0015] According to some specific embodiments of the utility model, the manipulator assembly includes: a weight-lifting support arm, one end of which is installed on the chassis, and the weight-lifting support arm and the fire extinguishing device are arranged side by side behind the fork plate assembly; a clamping claw, which is connected to the other end of the weight-lifting support arm, and is suitable for clamping and carrying the battery.

[0016] According to some specific embodiments of the utility model, the lifting support arm includes: a first connecting arm, the lower end of which is hinged to the chassis and extends obliquely upward; a second connecting arm, which is hinged to the upper end of the first connecting arm; a first driving cylinder, which drives the first connecting arm to rotate relative to the chassis; and a second driving cylinder, which drives the second connecting arm to rotate relative to the first connecting arm.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 It is a structural schematic diagram of a vehicle carrying device according to an embodiment of the utility model;

[0020] Figure 2 is another structural schematic diagram of a vehicle carrying device according to an embodiment of the utility model;

[0021] Figure 3 is a structural schematic diagram of a fork plate assembly of a vehicle carrying device according to an embodiment of the utility model;

[0022] Figure 4 It is a partial schematic diagram of a fork plate assembly of a vehicle carrying equipment according to an embodiment of the utility model.

[0023] Reference numerals:

[0024] Battery carrier 1, carrier 100, fork plate assembly 200, manipulator assembly 300, fire extinguishing device 400,

[0025] chassis 110, wheel 120, front wheel 121, rear wheel 122, lifting frame 210, fork 220, fixing clamp 230,

[0026] Crossbar 231, clamping arm 232, weight-lifting support arm 310, clamping claw 320, first connecting arm 311,

[0027] The second connecting arm 312, the first driving cylinder 313, the second driving cylinder 314, the slide groove 201, the pulley bracket 202,

[0028] Pulley 203 , water tank 410 , nozzle 420 , slideway 411 . DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0032] In the description of the present invention, "multiple" means two or more, and "several" means one or more.

[0033] The battery carrier 1 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0034] like Figure 1-Figure 4 As shown, the battery carrier 1 according to the embodiment of the present utility model includes a carrier 100 , a fork plate assembly 200 , a manipulator assembly 300 and a fire extinguishing device 400 .

[0035] The carrier 100 is constructed with a chassis 110 and wheels 120. A fork plate assembly 200 is escalably mounted on the chassis 110 and extends outward from the chassis 110, and the forks of the fork plate assembly 200 are suitable for lifting batteries. A manipulator assembly 300 is mounted on the chassis 110, and the manipulator assembly 300 is suitable for grabbing batteries. A fire extinguishing device 400 is mounted on a side of the chassis 110 that is away from the fork plate assembly 200.

[0036] For example, in the process of transporting batteries, the carrier 100 provides support and installation carriers through the chassis 110. The batteries are transported to a suitable position through the wheels 120. The fork plate assembly 200 is installed on the outside of the chassis 110, and the forks are arranged and supported on the bottom of the battery. The manipulator assembly 300 is installed on the upper part of the chassis 110, and can be freely moved to a suitable grasping position to grasp batteries of different positions and sizes. The fire extinguishing device 400 is located side by side with the manipulator assembly 300 on the top of the chassis 110 to ensure the safety of the battery transport device 1.

[0037] According to the battery transport device 1 of the embodiment of the utility model, the fork plate assembly 200 and the manipulator assembly 300 are respectively controlled to transport batteries of different models. The fork plate assembly 200 can transport some batteries of conventional shapes, and the batteries are stacked on the fork plate assembly 200 for transportation. For some batteries with smooth surfaces and special-shaped structures, the stability of the battery during transportation can be ensured by using the manipulator assembly 300 for grabbing. The fork plate assembly 200 is forked and supported at the bottom of the battery. After the fork plate assembly 200 lifts the battery, the carrier 100 moves to transport the battery to the target position. The manipulator assembly 300 grabs batteries of other models, and the battery transportation is more diverse and more flexible. Moreover, the manipulator assembly 300 can also cooperate with the fork plate assembly 200, and after grabbing the battery, the grabbed battery is stacked with the battery supported by the fork plate assembly 200 to ensure the stability of transportation. In addition, by constructing the fire extinguishing device 400, when a fire accident occurs in the battery or other components, it can be handled in time and the fire can be prevented from spreading, thereby ensuring the safety of the equipment and operators.

[0038] Therefore, the battery carrier 1 according to the embodiment of the utility model can carry batteries of different models, and has the advantages of carrying various types of batteries, good stability, good safety, etc.

[0039] In some specific embodiments of the present invention, Figure 1 and Figure 3As shown, the fork plate assembly 200 includes a lifting frame 210, a fork 220 and a fixing clamp 230. The lifting frame 210 is mounted on the chassis 110 and extends upward. The fork 220 is mounted on the lifting frame 210 so as to be liftable, and the fork 220 is suitable for forking at the bottom of the battery to carry the battery. The fixing clamp 230 is mounted on the lifting frame 210 so as to be liftable, and the fixing clamp 230 is located above the fork 220 and clamps and fixes the battery on both sides.

[0040] The battery is supported from the bottom by the fork 220 and can be raised and lowered. The battery can be lifted to different heights and stacked. The fixing clamps 230 are located on both sides of the fork 220 to clamp and fix the battery, ensuring the stability and safety of the battery during transportation, preventing the battery from sliding or tilting, and reducing safety hazards during transportation. The lifting of the fork 220 can ensure that the battery is placed in a suitable position for handling and transportation. The lifting frame 210 serves as an installation carrier for the fork 220, which can prevent the fork 220 and the battery thereon from tilting, thereby improving the safety of the battery transport device 1.

[0041] In some specific embodiments of the present invention, Figure 1 and Figure 3 As shown, the fixing clamp 230 includes a cross bar 231 and a clamping arm 232. The cross bar 231 is installed on the lifting frame 210 in a liftable manner, and the cross bar 231 extends in the horizontal direction. The fork 220 is connected to the bottom of the cross bar 231 and is lifted and lowered together with the cross bar 231. The clamping arm 232 is installed on the cross bar 231 and is adjacent to both ends of the cross bar 231. The clamping arm 232 is suitable for clamping and fixing the battery. The cross bar 231 extends in the horizontal direction and is connected to the fork 220, providing a stable support on the side of the battery, so that the fork 220 can stably carry and lift the battery. The clamping arm 232 is symmetrically installed on both sides of the cross bar 231 to clamp and fix the battery during transportation. When the cross bar 231 and the fork 220 are lifted and lowered, the clamping arm 232 provides a clamping force inward to fix the battery to maintain balance.

[0042] In some specific embodiments of the present invention, Figure 3 As shown, the crossbar 231 is constructed with a slide groove 201 extending in the length direction, and the clamping arm 232 is movably installed in the slide groove 201 to clamp and fix the battery. The slide groove 201 can adjust the position of the clamping arm 232. By adjusting the distance between the clamping arms 232 on both sides, it can be clamped at a suitable clamping position on the crossbar 231, thereby adapting to batteries of different sizes and ensuring that the battery can be firmly clamped. In addition, the structure of the slide groove 201 limits the movement of the clamping arm 232 on the crossbar 231 in the horizontal direction. When the clamping arm 232 moves to a suitable position, it can tightly clamp the battery to prevent the battery from sliding during transportation. At the same time, the clamping arm 232 can move in the slide groove 201 according to actual conditions, thereby improving the flexibility of the battery carrier 1.

[0043] In some specific embodiments of the present invention, Figure 4 As shown, a pulley bracket 202 is configured on one side of the cross bar 231 facing the lifting frame 210, and the pulley bracket 202 is provided with a pulley 203. The lifting frame 210 is configured with a slide groove extending in the vertical direction, and the pulley 203 is movably mounted on the slide groove. For example, both sides of the lifting frame 210 are configured with vertically extending slide grooves, and the pulley bracket 202 is mounted on the cross bar 231, and can move up and down along the extension direction of the slide groove through the pulley 203. Through the cooperation between the pulley 203 and the slide groove, the battery can be easily moved between the cross bar 231 and the lifting frame 210, thereby improving the convenience and operability of the battery carrier 1.

[0044] The slide groove ensures that the pulley 202 moves along a fixed path during the up and down movement of the battery, so that the battery remains stable during the lifting process.

[0045] In some specific embodiments of the present invention, Figure 1 and Figure 2 As shown, the wheel 120 includes a front wheel 121 and a rear wheel 122. The diameter of the front wheel 121 is larger than that of the rear wheel 122. The fork plate assembly 200 is installed on the side of the chassis 110 facing the front wheel 121, and the manipulator assembly 300 and the fire extinguishing device 400 are installed on the side of the chassis 110 adjacent to the rear wheel 122. Among them, the front wheel 121 needs to bear a larger force and needs to provide a better turning radius and handling performance, so the diameter of the front wheel 121 is larger, which reduces the friction and resistance during turning. The rear wheel 122 is subjected to less force, and the smaller diameter rear wheel 122 helps to provide maneuverability, making it easier for the battery carrier 1 to turn and adjust the direction. In the process of carrying the battery, the battery is rotated with the forked battery as the center, and the center position is placed in the front. When turning and turning, it rotates around the center. Wheels 120 of different diameters will be more stable during the transportation process. Among them, the rear wheel 122 is a steering wheel, which is more flexible when carrying in a narrow space.

[0046] In some specific embodiments of the present invention, Figure 2As shown, the fire extinguishing device 400 includes a water tank 410 and a nozzle 420. The water tank 410 is installed on the chassis 110 and is located above the rear wheel 122. The nozzle 420 is connected to the side of the water tank 410 that faces away from the fork plate assembly 200. Among them, the water tank 410 is a rectangular parallelepiped structure, and a filling port is provided on the top surface of the water tank 410. The water tank 410 is filled with a fire extinguishing solution. After the water tank 410 is loaded with the fire extinguishing solution, it has a counterweight effect to prevent the battery carrier 1 from tipping over due to uneven mass on the front and rear sides during operation. If the battery encounters a fire, the nozzle 420 connected to the water tank 410 quickly cools the fire source by spraying the fire extinguishing solution to achieve the fire extinguishing effect. At the same time, the spraying direction of the nozzle 420 can be adjusted, and the fire extinguishing operation can be quickly implemented when a fire occurs, thereby improving the efficiency of fire extinguishing.

[0047] In some specific embodiments of the present invention, Figure 2 As shown, a slideway 411 extending in the vertical direction is constructed on one side of the water tank 410 facing away from the fork plate assembly 200, and the nozzle 420 can be installed on the slideway 411 in a lifting manner. The structure of the slideway 411 can make the nozzle 420 rise and fall in the vertical direction. For a fire at a high place, the nozzle 420 can be raised to a required position, and for a fire at a low place, the nozzle 420 can be lowered to a suitable position. By adjusting the position of the nozzle 420, the fire source can be better covered, and the effect of fire extinguishing is improved. At the same time, through the slideway 411, the nozzle 420 can be stably fixed on the slideway 411 during use, ensuring that the nozzle 420 will not shake or move during use, thereby improving the fire extinguishing accuracy of the nozzle 420 and improving the fire extinguishing efficiency.

[0048] In some specific embodiments of the present invention, Figure 1 and Figure 2 As shown, the manipulator assembly 300 includes a weight-lifting arm 310 and a clamping claw 320. One end of the weight-lifting arm 310 is mounted on the chassis 110, and the weight-lifting arm 310 and the fire extinguishing device 400 are arranged side by side at the rear of the fork plate assembly 200. The clamping claw 320 is connected to the other end of the weight-lifting arm 310, and the clamping claw 320 is suitable for clamping and transporting batteries. The weight-lifting arm 310 has a large carrying capacity and stability, and will extend or contract according to the position of the battery, drive the clamping claw 320 to move during the transportation process, and maintain the stability of the battery carrier 1. The clamping claw 320 can be used to clamp and fix the battery, and an anti-slip pad is provided on the inner side of the clamping claw 320 to prevent the battery from sliding during transportation. The bottom of the clamping claw 320 is bent inward, and its clamping force can be adjusted according to the size of the battery to ensure the stability and safety of the clamping.

[0049] In some specific embodiments of the present invention, Figure 1As shown, the weight-lifting support arm 310 includes a first connecting arm 311, a second connecting arm 312, a first driving cylinder 313 and a second driving cylinder 314. The lower end of the first connecting arm 311 is hinged to the chassis 110 and extends obliquely upward. The second connecting arm 312 is hinged to the upper end of the first connecting arm 311. The first driving cylinder drives the first connecting arm 311 to rotate relative to the chassis 110. The second driving cylinder 314 drives the second connecting arm 312 to rotate relative to the first connecting arm 311.

[0050] The first connecting arm 311 is tilted and extended so that the weight-lifting arm 310 can better adapt to the height changes of the ground and provide stable support. At the same time, the first connecting arm 311 can also bear part of the weight and balance force of the battery. The second connecting arm 312 is hinged to the upper end of the first connecting arm 311, which can extend the length of the weight-lifting arm 310, so that the manipulator assembly 300 can operate and carry the battery at a longer distance.

[0051] By adjusting the working state of the first drive cylinder 313 and the second drive cylinder 314, the angle and position of the weight-lifting support arm 310 can be controlled to adapt to different handling tasks. The first drive cylinder 313 can provide sufficient power and control capabilities so that the weight-lifting support arm 310 can remain stable and safe during the handling process. By adjusting the working state of the second drive cylinder 314, the extension and lifting of the weight-lifting support arm 314 can be controlled to adapt to the battery handling requirements of different heights.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0053] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery carrier, characterized in that: include: A carrier vehicle, the carrier vehicle being constructed with a chassis and wheels; a fork plate assembly, the fork plate assembly being liftably mounted on the chassis and extending outward from the chassis, the fork plate assembly being suitable for lifting the battery; A manipulator assembly, the manipulator assembly is mounted on the chassis, and the manipulator assembly is suitable for grabbing the battery; A fire extinguishing device is installed on a side of the chassis facing away from the fork plate assembly.

2. The battery carrier according to claim 1, characterized in that: The fork plate assembly comprises: A lifting frame, the lifting frame is installed on the chassis and extends upward; A fork, the fork being liftably mounted on the lifting frame, the fork being suitable for forking at the bottom of the battery to carry the battery; A fixing clamp is installed on the lifting frame in a liftable manner, and the fixing clamp is located above the fork and is suitable for clamping and fixing the battery on both sides.

3. The battery carrier according to claim 2, characterized in that: The fixing clip comprises: A crossbar, the crossbar is escalably mounted on the lifting frame, the crossbar extends in a horizontal direction, and the fork is connected below the crossbar and is raised and lowered together with the crossbar; A clamping arm is installed on the cross bar and adjacent to two ends of the cross bar, and the clamping arm is suitable for clamping and fixing the battery.

4. The battery carrier according to claim 3, characterized in that: The cross bar is configured with a slide slot extending along the length direction, and the clamping arm is movably mounted on the slide slot to clamp and fix the battery.

5. The battery carrier according to claim 3, characterized in that: A pulley bracket is configured on one side of the cross bar facing the lifting frame, and the pulley bracket is provided with a pulley; The lifting frame is configured with a slide groove extending in a vertical direction, and the pulley is movably mounted on the slide groove.

6. The battery carrier according to claim 1, characterized in that: The wheel comprises: A front wheel and a rear wheel, the diameter of the front wheel is larger than the diameter of the rear wheel, the fork plate assembly is installed on the side of the chassis facing the front wheel, and the manipulator assembly and the fire extinguishing device are installed on the side of the chassis adjacent to the rear wheel.

7. The battery carrier according to claim 6, characterized in that: The fire extinguishing device comprises: A water tank, the water tank being mounted on the chassis and located above the rear wheel; A spray head is connected to a side of the water tank facing away from the fork plate assembly.

8. The battery carrier according to claim 7, characterized in that: A slideway extending in a vertical direction is constructed on one side of the water tank facing away from the fork plate assembly, and the spray head is installed on the slideway in a liftable manner.

9. The battery carrier according to claim 1, characterized in that: The manipulator assembly comprises: A weight-lifting support arm, one end of which is mounted on the chassis, and the weight-lifting support arm and the fire extinguishing device are arranged side by side behind the fork plate assembly; A clamping claw is connected to the other end of the lifting arm, and the clamping claw is suitable for clamping and carrying the battery.

10. The battery carrier according to claim 9, characterized in that: The lifting arm comprises: A first connecting arm, the lower end of which is hinged to the chassis and extends obliquely upward; A second connecting arm, wherein the second connecting arm is hinged to an upper end of the first connecting arm; a first driving cylinder, the driving cylinder driving the first connecting arm to rotate relative to the chassis; A second driving cylinder drives the second connecting arm to rotate relative to the first connecting arm.