Heavy-load AGV trolley for material transfer

Abstract

The invention discloses a heavy-load AGV trolley for material transfer, and relates to the technical field of AGV trolleys, the heavy-load AGV trolley comprises a moving base, and four moving wheels are arranged at the bottom of the moving base; the damping seat mechanism comprises a plurality of dampers, the dampers are fixedly installed at the top of the movable base in a matrix mode, the top ends of the dampers are jointly and fixedly connected with a bearing seat, the dampers are sleeved with springs, and the two ends of the springs are fixedly connected with the top end of the movable base and the bottom end of the bearing seat correspondingly; two sliding grooves are transversely formed in the bottom of the bearing seat, and four positioning inserting grooves are formed in the bearing seat in a matrix mode. And the quick-disassembly type carriage mechanism comprises a carriage body, a double-end lead screw and a driving motor, and four positioning columns are fixedly connected to the bottom of the carriage body in a matrix mode. The universality, safety and maintenance convenience of the heavy-load AGV trolley are greatly improved, and the heavy-load AGV trolley is suitable for heavy-load material transfer scenes in multiple industries such as new energy, coal mines and rail transit.

Description

Technical Field

[0001] This invention relates to the field of AGV (Automated Guided Vehicle) technology, and in particular to a heavy-duty AGV for material handling. Background Technology

[0002] AGV (Automated Guided Vehicle) is an industrial vehicle equipped with automated guidance devices such as electromagnetic, optical, laser, or vision systems. It can autonomously travel along a preset path without human intervention. AGVs feature safety protection, automatic obstacle avoidance, and various transfer functions (such as loading, transporting, and unloading), enabling them to automatically handle, sort, and store materials. As a type of wheeled mobile robot, it is widely used in logistics warehousing, manufacturing production lines, and other scenarios, improving production efficiency, reducing labor costs, and enhancing system flexibility.

[0003] Heavy-duty AGVs generally refer to AGVs with a load-bearing capacity of 10 tons or more. They are designed specifically for handling heavy, large, and high-precision materials. They are often used in new energy, coal mining, power, rail transportation, and shipbuilding industries, among others. Their applications are extremely wide, as follows.

[0004] A search revealed patent CN220520057U, which discloses a lifting-type heavy-duty AGV trolley. The AGV includes a body with a cargo plate mounted on its surface via a lifting cylinder. A mounting block is fixedly mounted at the bottom of the body, with a mounting groove on its surface and symmetrical through holes on both sides. A threaded rod is horizontally rotatably mounted within the mounting groove, and a movable block is symmetrically threaded onto the threaded rod. Support rods are symmetrically fixedly mounted on the surfaces of two movable blocks, and a rectangular block is fixedly mounted between each pair of support rods. Ball bearings are rolled and embedded in the lower surfaces of both rectangular blocks. A transmission assembly is provided on the body. This invention, through the coordinated operation of the mounting block, threaded rod, movable block, support rod, rectangular block, ball bearings, lifting cylinder, and transmission assembly, allows the two ball bearings to move away from each other when the cargo plate is raised, thus making the AGV more stable and effectively preventing it from tipping over during movement.

[0005] As mentioned above, existing AGVs typically use a fixed connection between their body (mobile base) and the cargo platform or carriage, usually secured with multiple bolts. While this ensures stability, it makes disassembly and replacement of the cargo platform or carriage inconvenient. Disassembly and replacement require repeatedly tightening multiple bolts with tools, which is time-consuming, labor-intensive, and inefficient. This makes it difficult for AGVs to handle different materials. For example, a flat cargo platform is generally needed for transporting larger materials, while a carriage is required for smaller materials to prevent them from rolling off the AGV. The inconvenience of quickly replacing the cargo platform or carriage further reduces the usability of the AGV. Furthermore, when transporting heavy materials, rigid vibrations on bumpy roads can easily damage the AGV or the materials, causing unnecessary damage and losses. Therefore, a heavy-duty AGV for material transport is urgently needed to solve these technical problems. Summary of the Invention

[0006] This invention discloses a heavy-duty AGV trolley for material transfer. It features a quick-release carriage mechanism, which allows a double-ended lead screw to rotate via a drive motor during operation. This rotation causes two sliding blocks to move closer or further apart, thereby engaging or disengaging the limit post and the upper limit slot of the positioning post. Combined with the positioning function of the positioning post and the positioning slot, the carriage body and the carrier seat can be quickly assembled and disassembled without additional tools. The operation is convenient and efficient. The carrier components can be flexibly changed according to the different materials being transferred (e.g., large materials are adapted to the carrying plate, small materials to the carriage), significantly improving the versatility and adaptability of the AGV trolley.

[0007] By incorporating a shock-absorbing seat mechanism, when the AGV travels on bumpy roads, the damper and spring work together to form an elastic buffer structure, effectively absorbing and offsetting the rigid bumps and vibrations caused by heavy-load materials. This not only prevents damage to the AGV's own structure from vibration but also provides good protection for the transported materials, reducing material damage caused by vibration and ensuring the stability and safety of the heavy-load transport process. In summary, this solves the problems in the background technology.

[0008] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0009] The present invention provides a heavy-duty AGV trolley for material transfer, comprising a mobile base, wherein the bottom of the mobile base is provided with four wheels;

[0010] The shock absorber base mechanism includes multiple dampers, which are fixedly installed on the top of the mobile base in a matrix. The top ends of the multiple dampers are fixedly connected to a bearing seat. A spring is sleeved on the outside of each damper. The two ends of the spring are fixedly connected to the top end of the mobile base and the bottom end of the bearing seat, respectively. Two sliding grooves are opened laterally on the bottom of the bearing seat. Four positioning slots are opened in a matrix inside the bearing seat.

[0011] A quick-release carriage mechanism includes a carriage body, a double-ended lead screw, and a drive motor. The bottom of the carriage body is fixedly connected in a matrix with four positioning posts, each engaging with a positioning slot. The bottom of each positioning post extends through a support seat to below it. A limiting groove is laterally formed inside each positioning post. The double-ended lead screw is rotatably mounted on the bottom of the support seat via two bearing seats. Two slide blocks are symmetrically screwed onto the outside of the double-ended lead screw. The top of each slide block is slidably connected to two sliding grooves via two T-shaped sliders. Two limiting posts are fixedly connected to opposite sides of each slide block, engaging with the four limiting grooves. The drive motor is fixedly mounted on one side of the support seat via a mounting bracket, and its output end is connected to one end of the double-ended lead screw.

[0012] Furthermore, there is a gap between the bottom end of the positioning post and the top of the movable base, and the gap between the bottom end of the positioning post and the top of the movable base is greater than the maximum compression distance of the spring.

[0013] Furthermore, the bottom height of the slide is flush with the bottom height of the positioning post, and the top of the slide is close to but not in contact with the top of the support seat.

[0014] Furthermore, the positioning slot is a rectangular slot, the positioning post is a rectangular post, the positioning post and the positioning slot are in clearance fit, and the outer wall of the positioning post is a smooth surface.

[0015] Furthermore, handles are provided on both the front and rear sides of the carriage body. Both the handles and the carriage body are made of aluminum alloy, and the handles are fixedly connected to the carriage body by welding.

[0016] Furthermore, a set of limiting plates is provided on both the front and rear sides of the interior of the carriage body, and a partition is movably fitted between the two sets of limiting plates. The partition has an inner groove on both sides near its top, and the partition is located in the middle of the transverse direction of the carriage body.

[0017] Furthermore, the movable base has two longitudinally spaced mounting slots, which are located near the left and right ends of the movable base, respectively. A support plate is movably inserted into the mounting slot. A caster wheel is fixedly installed at the bottom of the support plate and is located away from the movable base. Two threaded grooves are formed at the top of the support plate. Two fixing blocks are fixedly connected to the front and rear sides of the movable base. A threaded knob is threaded through the fixing block and is screwed into one of the threaded grooves on the top of the support plate.

[0018] Furthermore, the bottom heights of the four casters are consistent, and the bottom heights of the casters are consistent with the bottom heights of the movable wheels.

[0019] The present invention has the following advantages over the prior art:

[0020] 1. This technical solution features a quick-release carriage mechanism, which allows the double-ended lead screw to rotate via a drive motor during operation. This causes the two sliding blocks to move closer or further apart, thereby engaging or disengaging the limit post and the upper limit slot of the positioning post. Combined with the positioning function of the positioning post and the positioning slot, the carriage body and the carrier can be quickly assembled and disassembled without the need for additional tools. The operation is convenient and efficient. The carrier components can be flexibly changed according to the different materials being transported (e.g., large-sized materials are adapted to the carrying plate, and small-sized materials are adapted to the carriage), which greatly improves the versatility and adaptability of the AGV.

[0021] 2. This technical solution incorporates a shock-absorbing seat mechanism, which allows the damper and spring to work together to form an elastic buffer structure when the AGV is traveling on bumpy roads. This effectively absorbs and offsets the rigid bumps and vibrations caused by heavy-load materials, preventing damage to the AGV's own structure from vibrations and providing good protection for the transported materials. This reduces material damage caused by vibrations and ensures the stability and safety of the heavy-load transport process.

[0022] 3. This technical solution achieves multiple practical advantages through the coordinated design of the mounting slot, support plate, casters, and threaded knob: During operation, the four casters and four moving wheels form an eight-wheel support structure, significantly improving the load-bearing stability and driving smoothness of the AGV, effectively preventing tipping and protecting equipment and materials; at the same time, the casters can distribute the force on the moving wheels, extending their service life and avoiding accelerated damage caused by heavy loads; when storing, loosening the threaded knob allows the support plate to be inserted into the mounting slot, and then fixed by the threaded knob engaging with another threaded groove on the top of the support plate, reducing the exposed part and the overall footprint, making storage easier; in addition, when the casters are damaged, loosening the threaded knob allows the support plate and casters to be directly removed, facilitating subsequent replacement of the casters without requiring workers to kneel on the ground to disassemble and install the casters, improving the convenience of caster replacement. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure from another perspective of the present invention;

[0026] Figure 3 This is a schematic diagram of the exploded structure of the support seat of the present invention;

[0027] Figure 4 This is a bottom view of the slide mounting structure of the present invention;

[0028] Figure 5 This is a schematic diagram of the exploded structure of the carriage body of the present invention.

[0029] Figure 6 This is a schematic diagram of the exploded structure of the partition installation of the present invention;

[0030] Figure 7 This is a schematic diagram of the support plate mounting structure of the present invention;

[0031] Figure 8 This is a schematic diagram of the cross-sectional structure of the support plate installation of the present invention;

[0032] Figure 9 This is a schematic diagram of the exploded structure of the support plate installation according to the present invention.

[0033] In the diagram: 1. Movable base; 2. Movable wheel; 3. Damper; 4. Bearing seat; 5. Spring; 6. Slide groove; 7. Positioning slot; 8. Carriage body; 9. Double-ended lead screw; 10. Drive motor; 11. Positioning post; 12. Limiting groove; 13. Bearing seat; 14. Slide block; 15. T-shaped slider; 16. Limiting post; 17. Mounting bracket; 18. Handle; 19. Limiting plate; 20. Partition; 21. Inner groove; 22. Mounting groove; 23. Support plate; 24. Universal wheel; 25. Threaded groove; 26. Fixing block; 27. Threaded knob. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be understood that the terms "surface", "side", "gap", "peripheral", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0036] Reference Figures 1-9 A heavy-duty AGV trolley for material transfer includes a mobile base 1, and four mobile wheels 2 are provided at the bottom of the mobile base 1.

[0037] The shock absorber base mechanism includes multiple dampers 3, which are fixedly installed on the top of the movable base 1 in a matrix. The top of the multiple dampers 3 is fixedly connected to a bearing seat 4. A spring 5 is sleeved on the outside of the damper 3. The two ends of the spring 5 are fixedly connected to the top of the movable base 1 and the bottom of the bearing seat 4, respectively. Two sliding grooves 6 are opened laterally on the bottom of the bearing seat 4. Four positioning slots 7 are opened in a matrix inside the bearing seat 4.

[0038] The quick-release carriage mechanism includes a carriage body 8, a double-ended lead screw 9, and a drive motor 10. The bottom of the carriage body 8 is fixedly connected with four positioning posts 11 in a matrix. The four positioning posts 11 are matched and engaged with four positioning slots 7 respectively. The bottom end of the positioning posts 11 extends through the support seat 4 to the bottom of the support seat 4. The interior of the positioning posts 11 has a limiting groove 12. The double-ended lead screw 9 is rotatably installed on the bottom of the support seat 4 through two bearing seats 13. The double-ended lead screw 9 is symmetrically screwed with two slide seats 14. The top of the slide seats 14 is slidably connected to two slide grooves 6 through two T-shaped sliders 15. Two limiting posts 16 are fixedly connected to the opposite side of the two slide seats 14. The four limiting posts 16 are matched and engaged with four limiting grooves 12 respectively. The drive motor 10 is fixedly installed on one side of the support seat 4 through a mounting bracket 17. The output end of the drive motor 10 is connected to one end of the double-ended lead screw 9.

[0039] There is a gap between the bottom end of the positioning post 11 and the top of the movable base 1, and the gap between the bottom end of the positioning post 11 and the top of the movable base 1 is greater than the maximum compression distance of the spring 5; the bottom height of the slide 14 is flush with the bottom height of the positioning post 11, and the top of the slide 14 is close to but does not contact the top of the bearing seat 4; the positioning slot 7 is a rectangular slot, the positioning post 11 is a rectangular post, the positioning post 11 and the positioning slot 7 are clearance fit, and the outer wall of the positioning post 11 is a smooth surface;

[0040] Handles 18 are provided on both the front and rear sides of the carriage body 8. Both the handles 18 and the carriage body 8 are made of aluminum alloy and are fixedly connected to the carriage body 8 by welding. A set of limiting plates 19 are provided on both the front and rear sides of the interior of the carriage body 8. A partition 20 is movably fitted between the two sets of limiting plates 19. An inner groove 21 is provided on both sides of the partition 20 near its top, and the partition 20 is located in the middle of the transverse direction of the carriage body 8.

[0041] The movable base 1 has two longitudinally arranged mounting slots 22, which are located near the left and right ends of the movable base 1, respectively. A support plate 23 is movably inserted into the mounting slot 22. A caster wheel 24 is fixedly installed at the bottom of the support plate 23, and the caster wheel 24 is located away from the movable base 1. Two threaded grooves 25 are opened at the top of the support plate 23. Two fixing blocks 26 are fixedly connected to the front and rear sides of the movable base 1. A threaded knob 27 is threaded through the fixing block 26 and is screwed into one of the threaded grooves 25 at the top of the support plate 23. The bottom height of the four casters 24 is the same, and the bottom height of the casters 24 is the same as the bottom height of the movable wheels 2.

[0042] In the specific implementation process, when it is necessary to install the carriage body 8, first lift the carriage body 8 by holding the handle 18, align the four positioning pins 11 at the bottom of the carriage body 8 with the four positioning slots 7 on the support seat 4 and insert them until the bottom of the positioning pins 11 protrudes below the support seat 4; then start the drive motor 10, which drives the double-ended lead screw 9 to rotate. Since the threads at both ends of the double-ended lead screw 9 are opposite, and the slide block 14 is slidably limited by the T-shaped slider 15 and the slide groove 6, the two slide blocks 14 will move away from each other along the double-ended lead screw 9, thereby pushing the limiting pin 16 on the slide block 14 to insert into the limiting groove 12 of the positioning pin 11, thus completing the quick fixation of the carriage body 8 and the support seat 4; when it is necessary to disassemble and replace the carriage or replace it with a cargo board, start the drive motor 10 in reverse, so that the two slide blocks 14 are brought closer to each other, the limiting pin 16 is dislodged from the limiting groove 12, and then lift the carriage body 8 upward by holding the handle 18 to complete the disassembly. No additional tools are required throughout the process, and the operation is efficient and convenient;

[0043] Furthermore, during operation, when the AGV trolley travels on bumpy roads, the damper 3 and the spring 5 work together to form an elastic buffer structure, which can effectively absorb and offset the rigid bump vibration caused by heavy-load materials. This not only avoids damage to the AGV trolley's own structure caused by vibration, but also provides good protection for the transported materials, reducing material damage caused by vibration and ensuring the stability and safety of the heavy-load transport process.

[0044] During operation, the four omnidirectional wheels 24, in conjunction with the four movable wheels 2, form an eight-wheel support structure, significantly improving the load-bearing stability and driving smoothness of the AGV, effectively preventing the AGV from tipping over and protecting the AGV and materials. The omnidirectional wheels 24 also distribute the weight of the movable wheels 2, extending their overall service life and preventing accelerated damage due to long-term heavy loads. When it is necessary to store the AGV, the threaded knob 27 can be loosened, the support plate 23 can be retracted into the mounting slot 22, and then the threaded knob 27 can be turned back into place. The support plate 23 is fixed in place by another threaded groove 25 at the top of the support plate 23, which can be stored away to reduce the exposed part of the support plate 23 and the overall footprint of the AGV trolley, making it easier to store. When the caster wheel 24 is damaged or severely worn, the threaded knob 27 can be loosened to remove the support plate 23 and the caster wheel 24 together, which is convenient for subsequent replacement of the caster wheel 24. There is no need for the staff to kneel on the ground to disassemble and install the caster wheel 24, which improves the convenience of replacing the caster wheel 24.

[0045] The distance between the bottom of the positioning column 11 and the top of the mobile base 1 is greater than the maximum compression distance of the spring 5, which can prevent the positioning column 11 from colliding with the mobile base 1 during the downward movement of the bearing seat 4 when the AGV is under heavy load and bumpy, thus preventing the positioning column 11 or the mobile base 1 from being damaged by the collision and ensuring the safety of the structure operation.

[0046] The bottom height of the slide block 14 is flush with the bottom height of the positioning post 11, and the top of the slide block 14 does not contact the top of the support seat 4. On the one hand, this ensures that the slide block 14 drives the limiting post 16 to be horizontally inserted into the limiting groove 12 of the positioning post 11, ensuring the accuracy of the limiting engagement; on the other hand, it avoids friction caused by the contact between the slide block 14 and the top of the support seat 4, reducing component wear, and at the same time, it prevents the slide block 14 from occupying the top space of the support seat 4, so as not to affect the installation fit of the carriage body 8.

[0047] The positioning slot 7 is a rectangular slot and the positioning post 11 is a rectangular post with a clearance fit. The rectangular structure can effectively limit the circumferential rotation of the carriage body 8 relative to the bearing seat 4, and prevent the carriage body 8 from twisting and shifting during transportation. The clearance fit and the smooth outer wall of the positioning post 11 can reduce the frictional resistance when the positioning post 11 is inserted into or pulled out of the positioning slot 7, making the disassembly and assembly of the carriage body 8 smoother and less strenuous.

[0048] Among them, aluminum alloy handles 18 are installed on the front and rear sides of the carriage body 8 and fixed by welding. The aluminum alloy material has both lightweight and high strength characteristics, which not only makes it convenient for staff to hold to assist in carrying or adjusting the carriage body 8, but also prevents the handles 18 from breaking due to long-term use. The welding method ensures that the handles 18 are firmly connected to the carriage body 8 and will not loosen or fall off under heavy load or frequent operation.

[0049] The compartment body 8 is equipped with a partition 20 that is movably attached by a limiting plate 19. The partition 20 has internal slots 21 on both sides. The partition 20 can divide the interior of the compartment into two independent spaces, which is convenient for classifying and transferring small materials of different types or specifications, and avoids mixing of materials. The movable mounting design and internal slots 21 make it easy for staff to quickly install and remove the partition 20 according to material needs, flexibly adjust the interior space layout of the compartment, and improve the flexibility of use.

[0050] Among them, the bottom height of the four omnidirectional wheels 24 is the same and the height is flush with that of the moving wheels 2, which can ensure that the force on each wheel is even when the eight wheels are supported, avoid the AGV trolley tilting due to the height difference of the wheels, and ensure the stability during heavy-load transportation.

[0051] The movable base 1 is equipped with a drive mechanism and a steering mechanism to drive the movable wheel 2, and an automatic guide device is installed on both the outside and inside of the movable base 1. This is an existing technology application and will not be described in detail here.

[0052] The mobile base 1 has a vehicle power supply fixedly installed inside. The vehicle power supply is electrically connected to the drive motor 10 through wires to provide working power to the drive motor 10. The drive motor 10 is externally connected to a controller.

[0053] Among them, damper 3 is an industrial-grade hydraulic damper (model: YH-100 heavy-duty hydraulic damper), with a damping coefficient of 5000 N·s / m and a maximum bearing pressure of not less than 15 tons.

[0054] Among them, the double-ended lead screw 9 is made of 40Cr alloy structural steel and is heat-treated (hardness reaches HRC28-32) to ensure high strength and wear resistance; the pitch is 8mm and the threads at both ends turn in opposite directions to ensure that the two slides 14 can move synchronously in opposite directions along the lead screw.

[0055] The depth to which the limiting post 16 is inserted into the limiting groove 12 is not less than 30mm; the limiting post 16 is made of 20CrMnTi alloy structural steel and is carburized and quenched (the surface hardness reaches HRC58-62) to improve wear resistance and shear strength; the insertion end of the limiting post 16 is provided with a 15° chamfer to facilitate the smooth insertion of the limiting post 16 into the limiting groove 12 and avoid jamming.

[0056] Among them, spring 5 is made of 60Si2Mn spring steel with an elastic modulus of 2000N / mm. The maximum compression distance of spring 5 is 40mm, the wire diameter of spring 5 is 12mm, the outer diameter is 80mm, and the effective number of coils is 8, ensuring a load-bearing capacity of not less than 12 tons. When the AGV trolley encounters bumps, spring 5 first absorbs some of the vibration energy, while damper 3 suppresses the rebound oscillation of spring 5. The two work together to control the vibration amplitude within 5mm, avoiding damage to equipment and materials.

[0057] Among them, the casters 24 are heavy-duty industrial casters (model: HL-200 heavy-duty casters). The maximum load capacity of a single caster 24 is not less than 3 tons, and the total load capacity of the four casters 24 is not less than 12 tons, ensuring that the force on the moving wheels 2 can be effectively distributed (assuming the rated load of the AGV is 10 tons, the weight can be evenly distributed among the four moving wheels 2 and the four casters 24, with each wheel bearing a force of about 1.25 tons, which is far lower than its maximum load capacity). The casters 24 adopt a double ball bearing design and the wheel surface material is polyurethane, ensuring the service life and rotation flexibility of the casters 24 under heavy loads.

[0058] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A heavy load AGV trolley for material transfer, comprising a mobile base (1), characterized in that: The bottom of the mobile base (1) is provided with four mobile wheels (2); The shock base mechanism comprises a plurality of dampers (3) which are fixedly installed on the top of the mobile base (1) in a matrix manner, the top ends of the plurality of dampers (3) are fixedly connected with a bearing seat (4), the dampers (3) are externally sleeved with springs (5), the two ends of the springs (5) are fixedly connected with the top end of the mobile base (1) and the bottom end of the bearing seat (4) respectively, the bottom of the bearing seat (4) is transversely provided with two sliding grooves (6), and the inside of the bearing seat (4) is provided with four positioning insertion grooves (7) in a matrix manner. The quick-release type carriage mechanism comprises a carriage body (8), a double-head screw rod (9) and a driving motor (10), the bottom of the carriage body (8) is fixedly connected with four positioning columns (11) in a matrix manner, the four positioning columns (11) are matched and clamped with the four positioning insertion grooves (7) respectively, the bottom end of the positioning column (11) extends to below the bearing seat (4) through the bearing seat (4), the inside of the positioning column (11) is transversely provided with a limiting groove (12), the double-head screw rod (9) is rotatably installed at the bottom of the bearing seat (4) through two bearing seats (13), the outside of the double-head screw rod (9) is symmetrically screwed with two sliding seats (14), the top of the sliding seat (14) is slidably connected with the two sliding grooves (6) through two T-shaped sliding blocks (15), the opposite side of each of the two sliding seats (14) is fixedly connected with two limiting columns (16), the four limiting columns (16) are matched and clamped with the four limiting grooves (12) respectively, and the driving motor (10) is fixedly installed on one side of the bearing seat (4) through a mounting frame (17) and is connected with one end of the double-head screw rod (9).

2. The heavy duty AGV of claim 1, wherein: The bottom end of the positioning column (11) and the top of the mobile base (1) are spaced apart, and the spacing between the bottom end of the positioning column (11) and the top of the mobile base (1) is greater than the maximum compression distance of the spring (5).

3. The heavy duty AGV of claim 1, wherein: The bottom of the sliding seat (14) is flush with the bottom of the positioning column (11), and the top of the sliding seat (14) is close to but not in contact with the top of the bearing seat (4).

4. The heavy duty AGV of claim 1, wherein: The positioning insertion groove (7) is a rectangular groove, the positioning column (11) is a rectangular column, the positioning column (11) is gap-fitted with the positioning insertion groove (7), and the outer wall of the positioning column (11) is a smooth surface.

5. The heavy duty AGV of claim 1, wherein: The front and rear sides of the carriage body (8) are each provided with a handle (18), the handle (18) and the carriage body (8) are each made of aluminum alloy material, and the handle (18) and the carriage body (8) are fixedly connected by welding.

6. The heavy duty AGV of claim 1, wherein: The inside of the carriage body (8) is provided with a set of limiting clamping plates (19) on the front and rear sides, a partition plate (20) is movably clamped between the two sets of limiting clamping plates (19), inner buckle grooves (21) are formed at the two sides of the partition plate (20) close to the top end thereof, and the partition plate (20) is located at the transverse middle position of the carriage body (8).

7. The heavy duty AGV of claim 1, wherein: The inside of the mobile base (1) is longitudinally provided with two installation grooves (22), the two installation grooves (22) are respectively close to the left and right ends of the mobile base (1), a supporting plate (23) is movably installed in the installation groove (22), the bottom of the supporting plate (23) is fixedly provided with a universal wheel (24), the universal wheel (24) is away from the mobile base (1), the top of the supporting plate (23) is provided with two threaded grooves (25), the front and back sides of the mobile base (1) are fixedly connected with two fixed blocks (26), a threaded knob (27) is penetrated through the fixed block (26), and the threaded knob (27) is matched with screwing with one threaded groove (25) on the top of the supporting plate (23).

8. A heavy duty AGV cart for material transfer according to claim 7, characterized in that: The bottoms of the four universal wheels (24) are consistent in height, and the bottoms of the universal wheels (24) are consistent in height with the bottom of the mobile wheel (2).

Images