Heavy-load bearing lifting AGV (Automatic Guided Vehicle)

Abstract

The heavy-load bearing lifting AGV trolley comprises a trolley body, a lifting mechanism, a damping mechanism and a walking mechanism, the lifting mechanism is fixedly connected with the trolley body, and the lifting mechanism comprises a lifting table, a bottom plate, a first rotating shaft, a fixing plate, a first connecting mechanism, a second connecting mechanism and a lifting device; first guide rails are symmetrically arranged on the inner side wall of the lifting table, second guide rails are symmetrically arranged on the side wall of the bottom plate, the four sets of fixing plates are arranged and arranged on the inner side walls of the lifting table and the bottom plate correspondingly, and the first connecting mechanism and the second connecting mechanism are arranged in a crossed mode and rotationally connected through a first rotating shaft. A groove is formed in the lower end face of the vehicle body, the damping mechanism is fixedly connected with the upper end face of the groove, and the lower end face of the damping mechanism is connected with the walking mechanism. The heavy-load bearing lifting AGV trolley is suitable for complex road conditions, stable in walking and high in space utilization rate.

Description

Technical Field

[0001] The present invention relates to the technical field of AGVs, and more specifically, it relates to a heavy-duty back-carrying lifting AGV cart. Background Art

[0002] An AGV is an intelligent handling device that realizes driverless operation through an automatic navigation system. It can autonomously complete tasks such as material transportation and loading / unloading in environments such as factories and warehouses according to preset programs or real-time instructions, reducing labor costs and improving productivity. With its intelligent and flexible characteristics, the AGV cart has become one of the core tools for modern logistics automation. Currently, AGV carts are widely used in scenarios such as manufacturing, intelligent logistics, and the medical field.

[0003] The main types of existing AGV carts are: Latent AGVs, which sneak under the shelves to carry the shelves, and are mainly used in scenarios such as e-commerce warehouses; Forklift AGVs, which have a lifting function and replace traditional forklifts, and are mainly used in scenarios such as material stacking in automobile manufacturing plants; Towing AGVs, which can tow multiple carriers to form a train mode, and are mainly used in scenarios such as airport luggage transportation; Roller AGVs, which integrate a conveyor line to achieve automatic loading and unloading, and are mainly used in scenarios such as material flow on 3C electronics production lines.

[0004] Existing AGV carts have some drawbacks. Traditional AGV carts use rigid suspensions or simple spring shock absorbers, which are prone to high-frequency vibration transmission in complex road conditions. The walking mechanism of traditional AGV carts uses rollers. When carrying heavy goods or in complex road conditions, such as scenarios like workshop joints and speed bumps, the AGV cart will move unsteadily. Existing AGV carts cannot flexibly control the handling height when carrying goods, and the space utilization rate of the lifting mechanism is low. Summary of the Invention

[0005] (1) Technical Problems to be Solved Aiming at the problems existing in the prior art, the present invention provides a heavy-duty back-carrying lifting AGV cart to solve the technical problems of poor shock absorption effect and low space utilization rate of the lifting mechanism mentioned in the background art.

[0006] (2) Technical Solutions To achieve the above object, the present invention provides the following technical solutions: An overloaded back-carrying and lifting AGV cart, comprising a vehicle body, a lifting mechanism, a shock-absorbing mechanism, and a traveling mechanism. The lifting mechanism is fixedly connected to the vehicle body. The lifting mechanism includes a lifting platform, a bottom plate, a first rotating shaft, a fixing plate, a first connecting mechanism, a second connecting mechanism, and a lifting device. First guide rails are symmetrically arranged on the inner side walls of the lifting platform, and second guide rails are symmetrically arranged on the side walls of the bottom plate. The bottom plate is fixedly connected to the inner side of the vehicle body. Four groups of fixing plates are provided, and the four groups of fixing plates are respectively arranged on the inner side walls of the lifting platform and the bottom plate. The first connecting mechanism and the second connecting mechanism are arranged crosswise and are rotationally connected through the first rotating shaft. A groove is provided on the lower end surface of the vehicle body, and the shock-absorbing mechanism is fixedly connected to the upper end surface of the groove. The lower end surface of the shock-absorbing mechanism is connected to the traveling mechanism.

[0007] The present invention is further configured such that the first connecting mechanism includes a first support rod, a first locking bolt, a first guide wheel, and a second locking bolt. Two first support rods are symmetrically arranged. One end of the first support rod is rotationally connected to two groups of fixing plates on the lifting platform through the first locking bolt, and the other end is rotationally connected to the first guide wheel through the second locking bolt. The first guide wheel is slidably connected in the second guide rail. The first connecting mechanism cooperates with the lifting platform and the bottom plate to adjust the height of the lifting platform.

[0008] The present invention is further configured such that two second support rods are symmetrically arranged. The second connecting mechanism includes a second support rod, a third locking bolt, a second guide wheel, and a fourth locking bolt. The second support rod is arranged crosswise with the first support rod and is rotationally connected through the first rotating shaft. One end of the second support rod is rotationally connected to two groups of fixing plates on the bottom plate through the third locking bolt, and the other end is rotationally connected to the second guide wheel through the fourth locking bolt. The second guide wheel is slidably connected in the first guide rail. The second connecting mechanism cooperates with the first connecting mechanism to control the scissor movement, thereby adjusting the height of the lifting platform.

[0009] The present invention is further configured such that the lifting device includes a fixing frame, a hydraulic cylinder, a first strengthening cross bar, and a second strengthening cross bar. The first strengthening cross bar is arranged between two first support rods, and the second strengthening cross bar is arranged between two second support rods. Four fixing frames are provided and are respectively arranged on the first strengthening cross bar and the second strengthening cross bar. One end of the hydraulic cylinder is rotationally connected to the fixing frame on the first strengthening cross bar, and the other end is rotationally connected to the fixing frame on the second strengthening cross bar. The telescopic movement of the hydraulic cylinder controls the scissor movement of the first connecting mechanism and the second connecting mechanism to achieve the lifting movement.

[0010] The present invention is further configured such that the traveling mechanism includes a motor, a tripod, a second rotating shaft, a driving wheel, a driven wheel, and a triangular crawler. The output shaft of the motor passes through the tripod and is connected to the driving wheel. There are two driven wheels, and the two driven wheels are rotatably connected to the tripod through the second rotating shaft. The triangular crawler is sleeved on the surfaces of the driving wheel and the driven wheels. The motor drives the driving wheel to rotate, and the driving wheel drives the two driven wheels to rotate through the triangular crawler. The triangular structure greatly improves the stability and strength of the traveling mechanism to adapt to complex road conditions.

[0011] The present invention is further configured such that the shock absorption mechanism includes a first shock absorption device and a second shock absorption device. The first shock absorption device includes a U-shaped frame, a first top cylinder, a first spring, a first sliding rod, and a fixed block. The upper end surface of the fixed block is fixedly connected to the upper end surface of the groove, and the lower end surface of the fixed block is fixedly connected to the U-shaped frame. The upper end surface of the first top cylinder is fixedly connected to the lower end surface of the U-shaped frame. One end of the first spring is fixedly connected to the lower end surface of the first top cylinder, and the other end is fixedly connected to the upper end surface of the tripod. A first sliding rod is arranged at the central position of the first spring. The first sliding rod is slidably connected to the first top cylinder, and the lower end surface of the first sliding rod is fixedly connected to the upper end surface of the tripod. When the AGV cart encounters a ground protrusion or groove during walking, the first shock absorption is achieved by the cooperation of the first spring, the first top cylinder, and the first sliding rod.

[0012] The present invention is further configured such that the second shock absorption device includes a second top cylinder, a second spring, a second sliding rod, a bottom block, and a buffer pad. The lower end surface of the bottom block is fixedly connected to the upper end surface of the U-shaped frame. The upper end surface of the second top cylinder is fixedly connected to the groove. One end of the second spring is fixedly connected to the lower end surface of the second top cylinder, and the other end is fixedly connected to the upper end surface of the bottom plate. A second sliding rod is arranged at the central position of the second spring. The second sliding rod is slidably connected to the second top cylinder, and the lower end surface of the second sliding rod is connected to the bottom block. A buffer pad is arranged inside the second top cylinder. After the first shock absorption, the impact force is transmitted to the second shock absorption device, and the second shock absorption is achieved by the cooperation of the second spring, the second sliding rod, the second top cylinder, and the buffer pad.

[0013] (III) Beneficial effects Compared with the prior art, the present invention provides a heavy-duty back-carrying lifting AGV cart, which has the following beneficial effects: 1. By setting the lifting mechanism in the present invention, the second support rod and the first support rod are cross-arranged and rotatably connected through the first rotating shaft to form a scissor structure. The height of the lifting platform is controlled by pushing the support to open and close through the hydraulic cylinder. The scissor structure lifts smoothly and powerfully. Cooperating with the hydraulic cylinder, it can easily lift very heavy goods, ensuring that there will be no jamming or tilting during the lifting process. It is suitable for handling large equipment or stacking operations, and at the same time improves the space utilization rate.

[0014] 2. By providing a shock-absorbing mechanism in the present invention, when the trolley encounters complex bumpy road conditions during driving, the impact force is first transmitted to the first shock-absorbing device. The first spring, the first top cylinder, and the first sliding rod cooperate to achieve the first shock absorption. After the first shock absorption, the impact force is transmitted to the second shock-absorbing device, and the second spring, the second sliding rod, the second top cylinder, and the buffer pad cooperate to achieve the second shock absorption. The vibration is resolved in two stages, which not only protects the goods on the vehicle from shaking but also prevents the parts from being loosened by vibration, thus extending the service life.

[0015] 3. By providing a traveling mechanism in the present invention, a triangular crawler structure is adopted. The driving wheel is driven by the output shaft of the motor, and two driven wheels are synchronously driven to rotate through the triangular crawler. The triangular frame supports the overall structure. The design of the triangular crawler and the triangular frame makes the trolley run more steadily and is not prone to rollover or skidding when encountering complex road conditions such as potholes or slopes, making it safer and more reliable when carrying heavy loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of a heavy-duty load-carrying and lifting AGV trolley in the present invention; Figure 2 is a schematic diagram of the lifting mechanism structure of a heavy-duty load-carrying and lifting AGV trolley in the present invention; Figure 3 is a schematic diagram of the partial structure disassembly of a heavy-duty load-carrying and lifting AGV trolley in the present invention; Figure 4 is a schematic diagram of the shock-absorbing mechanism of a heavy-duty load-carrying and lifting AGV trolley in the present invention; Figure 5 is a schematic diagram of the traveling mechanism of a heavy-duty load-carrying and lifting AGV trolley in the present invention.

[0017] In the figure: 1, vehicle body; 2, lifting platform; 3, bottom plate; 4, first rotating shaft; 5, fixing plate; 6, first guide rail; 7, second guide rail; 8, groove; 9, first support rod; 10, first locking bolt; 11, first guide wheel; 12, second locking bolt; 13, second support rod; 14, third locking bolt; 15, second guide wheel; 16, fourth locking bolt; 17, fixing frame; 18, hydraulic cylinder; 19, first strengthening cross bar; 20, second strengthening cross bar; 21, motor; 22, triangular frame; 23, second rotating shaft; 24, driving wheel; 25, driven wheel; 26, triangular crawler; 27, channel-shaped frame; 28, first top cylinder; 29, first spring; 30, first sliding rod; 31, fixing block; 32, second top cylinder; 33, second spring; 34, second sliding rod; 35, bottom block; 36, buffer pad. DETAILED DESCRIPTION OF THE INVENTION

[0018] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0019] It should be pointed out that unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0020] In the present invention, unless otherwise stated, the directions such as "upper and lower" are generally in the direction shown in the drawings, or in the vertical, perpendicular or gravitational direction; similarly, for ease of understanding and description, "left and right" are generally left and right as shown in the drawings; "inside and outside" refer to the inside and outside of the contour of each component itself, but the above orientation terms are not used to limit the present invention.

[0021] Please refer to Figures 1 - 5 , a heavy-duty backpack lifting AGV cart, including a vehicle body 1, a lifting mechanism, a shock-absorbing mechanism, and a traveling mechanism. The lifting mechanism includes a lifting platform 2, a bottom plate 3, a first rotating shaft 4, a fixing plate 5, a first connecting mechanism, a second connecting mechanism, and a lifting device. First guide rails 6 are symmetrically provided on the inner side walls of the lifting platform 2, second guide rails 7 are symmetrically provided on the side walls of the bottom plate 3, the bottom plate 3 is fixedly connected to the inner side of the vehicle body 1, four groups of fixing plates 5 are provided, and the four groups of fixing plates 5 are respectively arranged on the inner side walls of the lifting platform 2 and the bottom plate 3. The first connecting mechanism and the second connecting mechanism are arranged crosswise and are rotatably connected through the first rotating shaft 4. A groove 8 is provided on the lower end surface of the vehicle body 1, the shock-absorbing mechanism is fixedly connected to the upper end surface of the groove 8, and the lower end surface of the shock-absorbing mechanism is connected to the traveling mechanism.

[0022] In a further embodiment, the first connecting mechanism includes first support rods 9, first locking bolts 10, first guide wheels 11, and second locking bolts 12. Two first support rods 9 are symmetrically provided. One end of the first support rod 9 is rotatably connected to two groups of fixing plates 5 on the lifting platform 2 through the first locking bolt 10, and the other end is rotatably connected to the first guide wheel 11 through the second locking bolt 12. The first guide wheel 11 is slidably connected in the second guide rail 7. Two second support rods 13 are symmetrically provided. The second connecting mechanism includes second support rods 13, third locking bolts 14, second guide wheels 15, and fourth locking bolts 16. The second support rods 13 are arranged crosswise with the first support rods 9 and are rotatably connected through the first rotating shaft 4. One end of the second support rod 13 is rotatably connected to two groups of fixing plates 5 on the bottom plate 3 through the third locking bolt 14, and the other end is rotatably connected to the second guide wheel 15 through the fourth locking bolt 16. The second guide wheel 15 is slidably connected in the first guide rail 6.

[0023] The first connecting mechanism and the second connecting mechanism form a scissors structure. The first guide wheel 11 connected to one end of the first support rod 9 slides in the second guide rail 7, and the second guide wheel 15 connected to one end of the second support rod 13 slides in the first guide rail 6, so as to realize the height adjustment of the lifting platform 2 through the scissors movement.

[0024] In a further embodiment, the lifting device includes a fixed frame 17, a hydraulic cylinder 18, a first reinforcing cross bar 19 and a second reinforcing cross bar 20. The first reinforcing cross bar 19 is arranged between two first support rods 9, the second reinforcing cross bar 20 is arranged between two second support rods 13, there are four fixed frames 17, which are respectively arranged on the first reinforcing cross bar 19 and the second reinforcing cross bar 20. One end of the hydraulic cylinder 18 is rotatably connected to the fixed frame 17 on the first reinforcing cross bar 19, and the other end is rotatably connected to the fixed frame 17 on the second reinforcing cross bar 20. By pushing the first support rod 9 and the second support rod 13 to open and close through the hydraulic cylinder 18, the height of the lifting platform 2 is controlled. The scissors structure lifts smoothly and powerfully, and can easily lift very heavy goods in cooperation with the hydraulic cylinder 18, ensuring that there will be no jamming or tilting during the lifting process, being suitable for handling large equipment or stacking operations, and improving the space utilization rate at the same time.

[0025] In a further embodiment, the traveling mechanism includes a motor 21, a tripod 22, a second rotating shaft 23, a driving wheel 24, a driven wheel 25 and a triangular crawler 26. The output shaft of the motor 21 passes through the tripod 22 and is connected to the driving wheel 24. There are two driven wheels 25, and the two driven wheels 25 are rotatably connected to the tripod 22 through the second rotating shaft 23. The triangular crawler 26 is sleeved on the surfaces of the driving wheel 24 and the driven wheel 25. Adopting the triangular crawler structure, the driving wheel 24 is driven by the output shaft of the motor 21, and the two driven wheels 25 are synchronously driven to rotate through the triangular crawler 26, and the tripod 22 supports the overall structure. The triangular crawler 26 and the tripod 22 make the trolley move more steadily, and it is not easy to roll over or slip when encountering complex road conditions such as potholes or slopes, and it is safer and more reliable when carrying heavy objects.

[0026] In a further embodiment, the shock absorption mechanism includes a first shock absorption device and a second shock absorption device. The first shock absorption device includes a J-shaped frame 27, a first top cylinder 28, a first spring 29, a first sliding rod 30 and a fixed block 31. The upper end surface of the fixed block 31 is fixedly connected to the upper end surface of the groove 8, the lower end surface of the fixed block 31 is fixedly connected to the J-shaped frame 27, the upper end surface of the first top cylinder 28 is fixedly connected to the lower end surface of the J-shaped frame 27, one end of the first spring 29 is fixedly connected to the lower end surface of the first top cylinder 28, and the other end is fixedly connected to the upper end surface of the tripod 22. The first sliding rod

[0027] The second shock-absorbing device includes a second top cylinder 32, a second spring 33, a second sliding rod 34, a bottom block 35, and a buffer pad 36. The lower end face of the bottom block 35 is fixedly connected to the upper end face of the channel-shaped frame 27. The upper end face of the second top cylinder 32 is fixedly connected to the groove 8. One end of the second spring 33 is fixedly connected to the lower end face of the second top cylinder 32, and the other end is fixedly connected to the upper end face of the bottom plate 3. The second sliding rod 34 is arranged at the central position of the second spring 33. The second sliding rod 34 is slidably connected to the second top cylinder 32. The lower end face of the second sliding rod 34 is connected to the bottom block 35. A buffer pad 36 is arranged in the second top cylinder 32.

[0028] When the trolley encounters a complex bumpy road condition during driving, the impact force is first transmitted to the first shock-absorbing device, and the first shock absorption is realized by the cooperation of the first spring 29, the first top cylinder 28 and the first sliding rod 30. After the first shock absorption, the impact force is transmitted to the second shock-absorbing device, and the second shock absorption is realized by the cooperation of the second spring 33, the second sliding rod 34, the second top cylinder 32 and the buffer pad 36. The vibration is resolved in two times, which not only protects the goods on the vehicle from shaking, but also prevents the parts from being loosened by vibration, and prolongs the service life.

[0029] In summary, when the overall equipment is in use: In the present invention, the lifting mechanism is connected to the vehicle body 1. The lifting mechanism realizes the height adjustment of the lifting platform 2 through a scissor structure, which is composed of a first connecting mechanism and a second connecting mechanism intersecting with each other, and the two are rotatably connected through a first rotating shaft 4. The first guide wheel 11 slides along the second guide rail 7 of the bottom plate 3, and the second guide wheel 15 slides along the first guide rail 6 of the lifting platform 2. Driven by the hydraulic cylinder 18, both ends of the hydraulic cylinder 18 are rotatably connected to the fixing brackets 17 on the first strengthening cross bar 19 and the second strengthening cross bar 20 respectively. When the hydraulic cylinder 18 expands and contracts, it pushes the scissor structure to open and close, driving the lifting platform 2 to rise and fall smoothly. With the cooperation of the scissor structure and the drive of the hydraulic cylinder 18, the lifting process is stable and powerful, can carry heavy objects without jamming or tilting, and at the same time has a compact structure, improving the space utilization rate.

[0030] The traveling mechanism adopts a triangular crawler 26. The driving wheel 24 is driven to rotate by the motor 21, and the two driven wheels 25 are synchronously driven to rotate through the triangular crawler 26. The triangular frame 22 supports the overall structure, and the second rotating shaft 23 ensures the flexible rotation of the driven wheels 25. The cooperation of the triangular crawler 26 and the triangular frame 22 enhances the passability of complex road conditions, reduces the risk of slipping or rollover, and makes heavy-load handling safer and more reliable.

[0031] The shock absorption mechanism is divided into two - stage shock absorption. The first shock absorption device consists of a first spring 29, a first top cylinder 28, and a first sliding rod 30. The fixed block 31 connects the groove 8 and the J - shaped frame 27. When the AGV cart encounters complex bumpy road conditions during walking, the first spring compresses to absorb the impact force, and the first sliding rod 30 slides with the first top cylinder 28 to buffer the vibration. The second shock absorption device consists of a second spring 33, a second top cylinder 32, a second sliding rod 34, and a buffer pad 36 to further absorb the residual vibration. The two - stage shock absorption gradually resolves the impact force, protecting the stability of the goods, preventing the loosening of parts, and extending the service life of the equipment.

[0032] Through the collaborative design of the scissor lift, the triangular walking mechanism, and the two - stage shock absorption, the AGV cart achieves the stability, efficiency, and safety of heavy - load handling, and is suitable for the complex operation requirements in industrial scenarios.

[0033] Among all the solutions mentioned above, for the connection between two components, welding, bolt - and - nut connection, bolt or screw connection, or other well - known connection methods can be selected according to the actual situation, which will not be elaborated one by one here. For those mentioned above involving fixed connection, welding is preferably considered. Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. Among all the solutions mentioned above, for those involving the operation of electrical components, without specific description, they are all controlled by the controller. Since the devices matched with the controller are common devices, their control principles and circuit connections are all well - known and mature technologies in the art, and the electrical connection relationships and specific circuit structures will not be elaborated here. Among all the solutions mentioned above, for those involving motors, if actually needed, they can be matched with reducers. The connection structure and working principle between them and the reducers are well - known technologies in the art, and the present invention will not elaborate on them. Among all the solutions mentioned above, for those involving the connection between solar panels and storage batteries, necessary accessories such as inverters, battery charge controllers, cables, fuses, and brackets can be used. Their control principles and circuit connections are all well - known and mature technologies in the art, and the electrical connection relationships and specific circuit structures will not be elaborated here.

Claims

1. An overloaded back-carrying and lifting AGV cart, comprising a vehicle body (1), a lifting mechanism, a shock-absorbing mechanism and a traveling mechanism, characterized in that: The lifting mechanism is fixedly connected to the vehicle body (1). The lifting mechanism includes a lifting platform (2), a bottom plate (3), a first rotating shaft (4), a fixing plate (5), a first connecting mechanism, a second connecting mechanism, and a lifting device. The inner sidewall of the lifting platform (2) is symmetrically provided with first guide rails (6), and the sidewall of the bottom plate (3) is symmetrically provided with second guide rails (7). The bottom plate (3) is fixedly connected to the inner side of the vehicle body (1). Four groups of fixing plates (5) are provided, and the four groups of fixing plates (5) are respectively arranged on the inner sidewalls of the lifting platform (2) and the bottom plate (3). The first connecting mechanism and the second connecting mechanism are arranged crosswise and are rotatably connected through the first rotating shaft (4). A groove (8) is formed on the lower end surface of the vehicle body (1), and the shock absorption mechanism is fixedly connected to the upper end surface of the groove (8). The lower end surface of the shock absorption mechanism is connected to the traveling mechanism.

2. The heavy-load carrying and lifting AGV cart according to claim 1, characterized in that: The first connecting mechanism includes a first support rod (9), a first locking bolt (10), a first guide wheel (11), and a second locking bolt (12). Two first support rods (9) are symmetrically arranged. One end of the first support rod (9) is rotatably connected to two groups of fixing plates (5) on the lifting platform (2) through the first locking bolt (10), and the other end is rotatably connected to the first guide wheel (11) through the second locking bolt (12). The first guide wheel (11) is slidably connected in the second guide rail (7).

3. The heavy-load back-carrying and lifting AGV trolley according to claim 1, characterized in that: The second connecting mechanism includes a second support rod (13), a third locking bolt (14), a second guide wheel (15), and a fourth locking bolt (16). Two second support rods (13) are symmetrically arranged. The second support rod (13) is arranged crosswise with the first support rod (9) and is rotatably connected through the first rotating shaft (4). One end of the second support rod (13) is rotatably connected to two groups of fixing plates (5) on the bottom plate (3) through the third locking bolt (14), and the other end is rotatably connected to the second guide wheel (15) through the fourth locking bolt (16). The second guide wheel (15) is slidably connected in the first guide rail (6).

4. The heavy-load carrying and lifting AGV cart according to claim 1, characterized in that: The lifting device includes a fixing frame (17), a hydraulic cylinder (18), a first reinforcing cross bar (19), and a second reinforcing cross bar (20). The first reinforcing cross bar (19) is arranged between two first support rods (9), and the second reinforcing cross bar (20) is arranged between two second support rods (13). Four fixing frames (17) are provided and are respectively arranged on the first reinforcing cross bar (19) and the second reinforcing cross bar (20). One end of the hydraulic cylinder (18) is rotatably connected to the fixing frame (17) on the first reinforcing cross bar (19), and the other end is rotatably connected to the fixing frame (17) on the second reinforcing cross bar (20).

5. The heavy-duty back-carrying and lifting AGV cart according to claim 1, wherein: The walking mechanism includes a motor (21), a tripod (22), a second rotating shaft (23), a driving wheel (24), a driven wheel (25), and a triangular crawler belt (26). The output shaft of the motor (21) passes through the tripod (22) and is connected to the driving wheel (24). There are two driven wheels (25), and the two driven wheels (25) are rotatably connected to the tripod (22) through the second rotating shaft (23). The triangular crawler belt (26) is sleeved on the surfaces of the driving wheel (24) and the driven wheels (25).

6. The heavy-load carrying and lifting AGV cart according to claim 5, characterized in that: The shock absorption mechanism includes a first shock absorption device and a second shock absorption device. The first shock absorption device includes a C-shaped frame (27), a first top cylinder (28), a first spring (29), a first sliding rod (30), and a fixed block (31). The upper end surface of the fixed block (31) is fixedly connected to the upper end surface of the groove (8), and the lower end surface of the fixed block (31) is fixedly connected to the C-shaped frame (27). The upper end surface of the first top cylinder (28) is fixedly connected to the lower end surface of the C-shaped frame (27). One end of the first spring (29) is fixedly connected to the lower end surface of the first top cylinder (28), and the other end is fixedly connected to the upper end surface of the tripod (22). A first sliding rod (30) is arranged at the central position of the first spring (29). The first sliding rod (30) is slidably connected to the first top cylinder (28), and the lower end surface of the first sliding rod (30) is fixedly connected to the upper end surface of the tripod (22).

7. The heavy-duty load-carrying and lifting AGV trolley according to claim 6, characterized in that: The second shock absorption device includes a second top cylinder (32), a second spring (33), a second sliding rod (34), a bottom block (35), and a buffer pad (36). The lower end surface of the bottom block (35) is fixedly connected to the upper end surface of the C-shaped frame (27). The upper end surface of the second top cylinder (32) is fixedly connected to the groove (8). One end of the second spring (33) is fixedly connected to the lower end surface of the second top cylinder (32), and the other end is fixedly connected to the upper end surface of the bottom plate (3). A second sliding rod (34) is arranged at the central position of the second spring (33). The second sliding rod (34) is slidably connected to the second top cylinder (32), and the lower end surface of the second sliding rod (34) is connected to the bottom block (35). A buffer pad (36) is arranged inside the second top cylinder (32).

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