Swing bridge structure of AGV (Automatic Guided Vehicle) and AGV

Abstract

The invention belongs to the field of AGVs, and relates to an AGV swing bridge structure and an AGV. According to the AGV swing bridge structure, the swing bridge structure is installed on a vehicle body chassis through a bearing seat and a swing bridge rotating shaft, the bearing seat comprises a double-face bearing cover, a U-shaped inner fixing plate and a U-shaped outer fixing plate, the double-face bearing cover comprises a rectangular plate and a cylindrical boss, and the cylindrical boss penetrates through a lower round hole of the U-shaped fixing plate to be installed on the U-shaped fixing plate; a thrust ball bearing is installed on one side of the cylindrical boss, a deep groove ball bearing is installed on one side of the rectangular plate, and the two ends of the swing bridge rotating shaft are rotationally connected with the thrust ball bearing and the deep groove ball bearing. The AGV comprises a vehicle body chassis, an AGV swing bridge structure, an upper fixed panel, an upper lifting panel and a lifting mechanism. The axial impact force bearing capacity of the swing bridge structure is improved through the thrust ball bearing, radial bearing and axial limiting and pushing are achieved through one bearing seat, and the swing bridge rotating shaft can be pre-tightened through the deep groove ball bearing to prevent an AGV from breaking down.

Description

Technical Field

[0001] The invention belongs to the technical field of AGV (automatic guided vehicle) wheel system structure, and specifically relates to an AGV vehicle swing bridge structure and an AGV vehicle. The AGV vehicle swing bridge structure is designed with a novel wheel system floating shock absorbing structure. Background Art

[0002] As an important part of automated logistics systems and mobile robot technology, AGV vehicles have been widely used in logistics warehousing, manufacturing, port handling, security inspection and other fields in recent years. In practical applications, AGV vehicles need to face various complex and changeable road conditions, such as unevenness, obstacles and slope changes. By designing a reasonable shock-absorbing structure, the vibration and impact caused by factors such as uneven road surface and acceleration changes can be effectively reduced, protecting the mechanical parts and cargo of the AGV vehicle from damage.

[0003] The swing bridge shock-absorbing structure is a wheel system floating shock-absorbing structure widely used in the field of AGV vehicles. The shaft connection of the existing swing bridge shock-absorbing structure usually adopts a conventional combination of axle, deep groove ball bearing and bearing seat. This structure has the following technical problems: 1. Deep groove ball bearings can withstand large radial forces, but cannot withstand large axial forces. When an AGV encounters sudden ups and downs on the road, in addition to the up and down vibrations, the forward and backward movement of the vehicle will also suddenly slow down due to the collision of the AGV steering wheel. For AGVs running under heavy loads, sudden deceleration will cause the swing bridge shaft to impact the deep groove ball bearing in the forward and backward directions (i.e. axial direction) due to inertia, which can easily cause damage to the deep groove ball bearing.

[0004] 2. As deep groove ball bearings cannot withstand large axial forces, the bearing seats and deep groove ball bearings are not pre-tightened in the axial direction during assembly. In addition, the size design will reserve installation tolerance clearance, which may cause the swing bridge shaft to be unable to be effectively limited in the axial direction. As the components age or become loose due to long-term vibration, it is very easy for the swing bridge shaft to move forward and backward, causing the AGV vehicle to malfunction. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an AGV vehicle swing bridge structure and an AGV vehicle. The technical solution adopted by the present invention is as follows: A swing bridge structure for an AGV vehicle, comprising a pair of bearing seats, a connecting mechanism, a swing bridge frame and a swing bridge rotating shaft, wherein the connecting mechanism is welded to the swing bridge frame, the swing bridge rotating shaft is welded to the connecting mechanism, the bearing seat comprises a double-sided bearing cover, a U-shaped inner fixing plate and a U-shaped outer fixing plate, the adjacent side surfaces of the U-shaped inner fixing plate and the U-shaped outer fixing plate are welded into one body, and the end side surfaces of the U-shaped inner fixing plate and the U-shaped outer fixing plate are welded to the vehicle chassis, the double-sided bearing cover comprises a rectangular plate and a cylindrical boss located at the center of one side of the rectangular plate, and through holes are provided in the centers of the rectangular plate and the cylindrical boss The U-shaped openings of the U-shaped inner fixing plate and the U-shaped outer fixing plate include an upper notch and a lower circular hole. The cylindrical boss of the double-sided bearing cover passes through the lower circular hole and is fixedly installed on the U-shaped outer fixing plate and the U-shaped inner fixing plate. The outer end of the cylindrical boss is flush with the surface of the U-shaped inner fixing plate. The outer end of the through hole of the cylindrical boss is provided with a recessed cylindrical step 1, and the thrust ball bearing is clamped and installed in the cylindrical step 1. The outer end of the through hole of the rectangular plate is provided with a recessed cylindrical step 2, and the deep groove ball bearing is clamped and installed in the cylindrical step 2. The two ends of the swing bridge shaft are rotatably connected with the thrust ball bearing and the deep groove ball bearing respectively.

[0006] Preferably, the swing bridge shaft is a symmetrical structure at both ends, and is divided into three sections with increasing diameters from the end to the middle. The diameter of the first section at the end cooperates with the deep groove ball bearing and the thrust ball bearing, and the thrust ball bearing abuts against the first step between the first section and the second section of the swing bridge shaft, and the second step between the second section and the third section cooperates and abuts against the connecting mechanism. The second section and the third section of the swing bridge shaft are welded into one with the connecting mechanism.

[0007] Preferably, trapezoidal reinforcing uprights are provided at the left and right edges on both sides of the outer surface of the U-shaped outer fixing plate, the lower surface of the trapezoidal reinforcing uprights is welded to the vehicle chassis, and the vertical side surfaces of the trapezoidal reinforcing uprights are welded to the outer surface edges of the U-shaped outer fixing plate.

[0008] Preferably, the surface of the U-shaped outer fixing plate is welded to the vehicle chassis, and a U-shaped inner fixing plate is welded to the inner side of the U-shaped outer fixing plate. The upper side, left side and right side of the U-shaped inner fixing plate are respectively aligned with the edge of the U-shaped outer fixing plate, and the lower end of the U-shaped inner fixing plate extends a section and is welded to the vehicle chassis.

[0009] Preferably, the U-shaped outer fixing plate, the double-sided bearing cover and the U-shaped inner fixing plate are each evenly provided with a plurality of bolt through holes corresponding to positions, and the double-sided bearing cover is fastened and installed to the U-shaped inner fixing plate and the U-shaped outer fixing plate after the bolts pass through the bolt through holes.

[0010] Preferably, steering wheel mounting plates are respectively welded to both ends of the swing bridge frame in the length direction, and the steering wheel of the AGV vehicle is fixedly mounted on the steering wheel mounting plates.

[0011] An AGV vehicle, using the aforementioned AGV vehicle swing bridge structure, comprises: a vehicle chassis, an AGV vehicle swing bridge structure, an upper fixed panel, an upper lifting panel and a lifting mechanism, wherein the AGV vehicle swing bridge structure is installed at one end of the vehicle chassis, and a pair of AGV vehicle steering wheels are installed on the lower surface of the other end of the vehicle chassis through a steering wheel mounting plate; a plurality of groups of parallel lifting mechanisms are installed on the upper surface of the vehicle chassis, the upper lifting panel is fixedly installed on the lifting end of the lifting mechanism, and the upper fixed panel is fixedly installed on the upper surface of the vehicle chassis between the upper lifting panels.

[0012] Beneficial effects of the present invention: 1) The present invention adds a thrust ball bearing at each end of the swing bridge shaft. The thrust ball bearing improves the ability of the AGV vehicle swing bridge structure to withstand axial impact force and avoids damage to the deep groove ball bearing.

[0013] 2) A new double-sided bearing cover installed in the bearing seat is designed, so that two different types of bearings, deep groove ball bearings and thrust ball bearings, can be installed on one bearing seat at the same time, and one bearing seat can simultaneously realize radial load-bearing and axial limiting and pushing. It has a simple structure, easy installation and space saving.

[0014] 3) In the present invention, the bearing seat and the thrust ball bearing bear the axial force. When assembling the swing bridge shaft, the swing bridge shaft can be pre-tightened by the deep groove ball bearing, eliminating the instability caused by the installation tolerance gap of the swing bridge shaft, making the structure more stable. The pre-tightening force can prevent the swing bridge shaft from moving forward and backward, thereby preventing the AGV vehicle from malfunctioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the existing AGV vehicle swing bridge structure; Figure 2 This is a schematic diagram of the improved new AGV vehicle swing bridge structure according to the first embodiment of the present invention; Figure 3 This is a partial disassembled schematic diagram of one side of the AGV vehicle swing bridge structure according to the first embodiment of the present invention; Figure 4 A schematic diagram of the structure of a double-sided bearing cap according to a first embodiment of the present invention; Figure 5 Another side structural schematic diagram of the double-sided bearing cover of the first embodiment of the present invention; Figure 6 It is a structural schematic diagram of the swing bridge rotating shaft connected to the bearing seat from the left side perspective according to the first embodiment of the present invention; Figure 7It is a structural schematic diagram of the swing bridge rotating shaft connected to the bearing seat from the right side perspective according to the first embodiment of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the AGV vehicle according to the second embodiment of the present invention from a top view angle; Fig. 9 This is a schematic diagram of the three-dimensional structure of the AGV vehicle according to the second embodiment of the present invention from an upward angle; In the figure, 1 is a swing bridge frame, 2 is a swing bridge shaft, 3 is a connecting mechanism, 4 is a deep groove ball bearing, 5 is a vehicle chassis, 6 is a steering wheel mounting plate, 7 is an AGV vehicle steering wheel, 8 is a double-sided bearing cover, 9 is a U-shaped inner fixing plate, 10 is a trapezoidal reinforcement vertical plate, 11 is a U-shaped outer fixing plate, 12 is a thrust ball bearing, 13 is an upper fixing panel, 14 is an upper lifting panel, and 15 is a lifting mechanism. DETAILED DESCRIPTION

[0016] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Embodiment 1

[0017] Because the swing bridge structure of the AGV is located at the bottom of the AGV, in order to more intuitively reflect the structural characteristics of the product, the drawings in the first embodiment of the present invention are all structural drawings after being turned upside down.

[0018] like Figure 1 As shown, the AGV vehicle swing bridge structure in the prior art includes a swing bridge frame 1 with a rectangular frame structure, and a connecting mechanism 3 is welded in the middle of the length direction of the swing bridge frame 1. The connecting mechanism 3 is mainly used to reliably install and support the swing bridge shaft 2. The specific structure of the connecting mechanism 3 can be flexibly designed according to needs. Figure 1The connecting mechanism 3 includes vertical surrounding welded plates that form a length-shaped box body. The length direction of the connecting mechanism 3 is consistent with the width direction of the swing bridge frame 1. A pair of surrounding welded plates in the length direction of the connecting mechanism 3 are welded with a middle welded plate with a semicircular opening. The two ends of the swing bridge shaft 2 pass through a pair of surrounding welded plates in the width direction of the connecting mechanism 3 and are adjacent to the middle welded plate. Finally, the positions where the swing bridge shaft 2 and the connecting mechanism 3 are connected are welded, and finally the swing bridge shaft 2, the connecting mechanism 3 and the swing bridge frame 1 are welded into a firm and reliable integral structure. A pair of bearing seats are welded on the body chassis of the AGV vehicle. The positions of the pair of bearing seats on the body chassis correspond to the two ends of the swing bridge shaft 2. Deep groove ball bearings are installed in the bearing seats, and the two ends of the swing bridge shaft 2 are rotatably installed in the deep groove ball bearings respectively. Through the deep groove ball bearing and the swing bridge shaft 2, the swing bridge frame 1 can form a seesaw-like shock-absorbing structure relative to the chassis. When the ground is uneven, the steering wheel of the AGV can be slightly raised and lowered without affecting the vehicle body through the rotation of the swing bridge shaft 2 on the swing bridge frame 1, thereby achieving shock absorption. Although the existing AGV vehicle has achieved the shock absorption function, it also has technical defects such as the swing bridge shaft 2 is easily damaged and the swing bridge shaft 2 moves forward and backward, which makes the AGV vehicle prone to failure.

[0019] like Figure 2-7As shown, the first embodiment of the present invention provides an improved AGV vehicle swing bridge structure for an AGV wheel system structure, including: a swing bridge frame 1, two improved bearing seats, a swing bridge shaft 2, two double-sided bearing caps 8, two deep groove ball bearings 4 and two thrust ball bearings 12. The connection structure and welding method of the swing bridge shaft 2 and the swing bridge frame 1 are roughly the same as those in the prior art. The horizontal steering wheel mounting plates 6 are respectively welded at both ends of the length direction of the swing bridge frame 1, and the AGV vehicle steering wheel 7 is fixedly mounted on the steering wheel mounting plates 6. A rectangular mounting groove of a size and shape matching the swing bridge frame 1 is opened on the vehicle chassis 5, and a certain gap is left between the swing bridge frame 1 and the vehicle chassis 5. In the first embodiment of the present invention, the structure of the swing bridge shaft 2 is improved, and the swing bridge shaft 2 is designed to be a symmetrical structure at both ends, and is divided into three sections with different diameters from the end to the middle. The diameters of the three sections from the end to the middle increase successively, and the diameter of the first section of the end cooperates with the deep groove ball bearing 4 and the thrust ball bearing 12. The two ends of the swing bridge shaft 2 are rotatably installed in the deep groove ball bearing 4 and the thrust ball bearing 12, and the thrust ball bearing 12 abuts against the first step between the first section and the second section of the swing bridge shaft 2, which can realize the axial limitation of the swing bridge shaft 2; the second section and the third section of the swing bridge shaft 2 are welded to a connecting mechanism 3 (the connecting mechanism 3 includes a plurality of surrounding welding plates and a middle welding plate), and the connecting mechanism 3 is then welded to the swing bridge frame 1, and the second step between the second section and the third section is used to cooperate with the connecting mechanism 3 for abutment and welding, and at the same time, the middle position of the third section of the swing bridge shaft 2 is also welded to the connecting mechanism 3, thereby increasing the mechanical strength and stability of the overall structure of the swing bridge frame 1 and the swing bridge shaft 2.

[0020] The improved bearing seat includes a double-sided bearing cover 8, a trapezoidal reinforcing vertical plate 10, a U-shaped inner fixing plate 9 and a U-shaped outer fixing plate 11. The U-shaped openings of the U-shaped inner fixing plate 9 and the U-shaped outer fixing plate 11 include an upper notch and a lower circular hole. The lower circular hole matches the outer diameter of the cylindrical boss of the double-sided bearing cover 8. The cylindrical boss of the double-sided bearing cover 8 passes through the lower circular hole and is installed in the U-shaped inner fixing plate 9 and the U-shaped outer fixing plate 11. The outer periphery of the cylindrical boss can fit and snap together with the inner periphery of the lower circular hole on the U-shaped inner fixing plate 9 and the U-shaped outer fixing plate 11.

[0021] The vehicle chassis 5 is a steel frame structure; the lower surface of the U-shaped outer fixing plate 11 is welded to the vehicle chassis 5, and a pair of trapezoidal reinforcing upright plates 10 are correspondingly arranged at the left and right edges on both sides of the outer surface of the U-shaped outer fixing plate 11. The lower surface of the trapezoidal reinforcing upright plates 10 is welded to the vehicle chassis 5, and the vertical side surfaces of the trapezoidal reinforcing upright plates 10 are welded to the outer surface edges of the U-shaped outer fixing plate 11. A U-shaped inner fixing plate 9 is welded to the inner side of the U-shaped outer fixing plate 11, and the upper side surface, left side surface and right side surface of the U-shaped inner fixing plate 9 are respectively aligned with the edge of the U-shaped outer fixing plate 11. The lower end of the U-shaped inner fixing plate 9 extends a section and is welded to the side surface of the steel frame beam in the vehicle chassis 5. The horizontal support force provided by the side surface of the steel frame beam improves the overall axial structural strength of the bearing seat. The U-shaped outer fixing plate 11, the double-sided bearing cover 8 and the U-shaped inner fixing plate 9 are each provided with six bolt through holes at corresponding positions. The double-sided bearing cover 8 is fastened and installed on the U-shaped inner fixing plate 9 and the U-shaped outer fixing plate 11 by passing bolts through the bolt through holes, thereby ensuring that the double-sided bearing cover 8 is installed firmly and reliably.

[0022] The double-sided bearing cover 8 includes an integrally formed rectangular plate and a cylindrical boss located at the center of one side of the rectangular plate. The rectangular plate and the cylindrical boss are provided with a through hole in the center for the swing bridge shaft 2 to pass through. A recessed cylindrical step 1 is provided at the outer end of the through hole of the cylindrical boss, and the cylindrical step 1 is just matched and connected with the thrust ball bearing 12. A recessed cylindrical step 2 is provided at the outer end of the through hole of the rectangular plate, and the cylindrical step 2 is just matched and connected with the deep groove ball bearing 4. The bearing cover in the prior art can usually only be matched and connected with one bearing. In the improved double-sided bearing cover 8 in the first embodiment of the present invention, the deeper recessed part on one side is used to install the deep groove ball bearing 4, and the shallower recessed part on the other side is used to install the thrust ball bearing 12. Through the innovative structural design of the double-sided bearing cover 8, only one bearing seat is used to limit and support two different bearings in different directions, thereby simplifying the installation steps and saving installation space.

[0023] The advantages of the combined structure of two U-shaped fixing plates in the first embodiment of the present invention are: first, the U-shaped outer fixing plate 11 mainly provides radial support for the swing bridge shaft 2, and the U-shaped inner fixing plate 9 mainly provides axial clamping force; secondly, from the perspective of material mechanics, a single fixing plate should not be made too thick, and the cylindrical boss of the double-sided bearing cover 8 is relatively high, and it is difficult for a single fixing plate to provide support for the entire cylindrical boss. The combined structure of two fixing plates can make the total thickness of the combined structure consistent with the height of the cylindrical boss, so that the lower circular holes of the two U-shaped grooves just surround the cylindrical boss of the entire double-sided bearing cover 8, providing more uniform support force, and also providing more stable protection for the swing bridge shaft 2.

[0024] In the first embodiment of the present invention, the improved bearing seat has an ingenious structure. The axial impact force of the swing bridge shaft 2 is transmitted to the improved bearing seat by the thrust ball bearing 12, and then directly transmitted to the vehicle chassis 5. The deep groove ball bearing 4 is arranged on the other side of the double-sided bearing cover 8, so it does not need to bear the axial impact force, but only needs to provide radial support. The deep groove ball bearing 4 and the thrust ball bearing 12 have their own functions, which greatly increases the AGV's ability to withstand axial impact during acceleration and deceleration, and the structure is more stable and reliable.

[0025] When the improved bearing seat is designed in size, the thickness of the U-shaped outer fixing plate 11 and the thickness of the double-sided bearing cover 8 can leave an interference fit margin, so that the swing bridge shaft 2 can be pre-tightened by the deep groove ball bearing 4 during assembly, and the swing bridge shaft 2 can be more stably limited in the axial direction. The pre-tightening force can ensure that the swing bridge shaft 2 will not loosen due to bumps or vibrations, thereby avoiding AGV vehicle failures. Embodiment 2

[0026] like Figure 8 , 9 As shown, the second embodiment of the present invention adopts the AGV vehicle swing bridge structure described in the first embodiment, and designs a new type of AGV vehicle, including: a vehicle chassis 5, an AGV vehicle swing bridge structure, an upper fixed panel 13, an upper lifting panel 14 and a lifting mechanism 15. The AGV vehicle swing bridge structure is installed at one end of the vehicle chassis 5 through the adjacent rectangular installation grooves reserved in the vehicle chassis 5. The lengths of the four sides of the rectangular installation grooves are slightly larger than the side lengths of the swing bridge frame of the AGV vehicle swing bridge structure, ensuring that the AGV vehicle swing bridge structure has sufficient rotation space. A pair of AGV vehicle steering wheels 7 are installed on the lower surface of the other end of the vehicle chassis 5 through the steering wheel mounting plate 6. Several groups of parallel lifting mechanisms 15 are installed on the upper surface of the vehicle chassis 5, and the upper lifting panel 14 is fixedly installed at the lifting end of the lifting mechanism 15. The upper fixed panel 13 is fixedly installed on the upper surface of the vehicle chassis 5 between the upper lifting panels 14.

[0027] When a large cargo needs to be transported, the upper lifting panel 14 is lowered to be flush with the upper fixed panel 13, so that an overall plane can be formed above the vehicle chassis 5; in addition, several groups of upper lifting panels 14 can be raised synchronously to slightly lift the large cargo and adjust the cargo height. At the same time, when multiple small cargoes need to be transported, the upper lifting panel 14 is raised to a certain height, so that several small partition areas can be formed above the vehicle chassis 5.

[0028] In the embodiments of the present invention, technical features that are not described in detail are all existing technologies or conventional technical means and will not be described in detail here.

[0029] Finally, it should be noted that the above embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them, and the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any technician familiar with the technical field can modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be covered within the protection scope of the present invention.

Claims

1. An AGV vehicle swing bridge structure, comprising a pair of bearing seats, a connecting mechanism (3), a swing bridge frame (1) and a swing bridge rotating shaft (2), wherein the connecting mechanism (3) is welded to the swing bridge frame (1), and the swing bridge rotating shaft (2) is welded to the connecting mechanism (3), characterized in that: The bearing seat comprises a double-sided bearing cover (8), a U-shaped inner fixing plate (9) and a U-shaped outer fixing plate (11), the adjacent side surfaces of the U-shaped inner fixing plate (9) and the U-shaped outer fixing plate (11) are welded into one piece, and the end side surfaces of the U-shaped inner fixing plate (9) and the U-shaped outer fixing plate (11) are welded to the vehicle chassis (5), the double-sided bearing cover (8) comprises a rectangular plate and a cylindrical boss located at the center of one side of the rectangular plate, the rectangular plate and the cylindrical boss are provided with through holes in the centers, and the U-shaped openings of the U-shaped inner fixing plate (9) and the U-shaped outer fixing plate (11) include upper notches and a lower circular hole, the cylindrical boss of the double-sided bearing cover (8) passes through the lower circular hole and is fixedly mounted on the U-shaped outer fixing plate (11) and the U-shaped inner fixing plate (9), the outer end of the cylindrical boss is flush with the surface of the U-shaped inner fixing plate (9), the outer end of the through hole of the cylindrical boss is provided with a recessed cylindrical step one, the thrust ball bearing (12) is snap-fitted and mounted in the cylindrical step one, the outer end of the through hole of the rectangular plate is provided with a recessed cylindrical step two, the deep groove ball bearing (4) is snap-fitted and mounted in the cylindrical step two, and the two ends of the swing bridge shaft (2) are rotatably connected to the thrust ball bearing (12) and the deep groove ball bearing (4) respectively.

2. The AGV vehicle swing bridge structure according to claim 1, characterized in that: The swing bridge shaft (2) is a symmetrical structure at both ends, and is divided into three sections with increasing diameters from the end to the middle. The diameter of the first section at the end matches the deep groove ball bearing (4) and the thrust ball bearing (12). The thrust ball bearing (12) abuts against a first step between the first section and the second section of the swing bridge shaft (2). The second step between the second section and the third section matches and abuts against a connecting mechanism (3). The second section and the third section of the swing bridge shaft (2) are welded to the connecting mechanism (3) as a whole.

3. The AGV vehicle swing bridge structure according to claim 1, characterized in that: Trapezoidal reinforcement upright plates (10) are correspondingly arranged at the left and right edges of the outer surface of the U-shaped outer fixing plate (11); the lower surface of the trapezoidal reinforcement upright plates (10) is welded to the vehicle chassis (5) as a whole; and the vertical side surfaces of the trapezoidal reinforcement upright plates (10) are welded to the outer surface edges of the U-shaped outer fixing plate (11) as a whole.

4. The AGV vehicle swing bridge structure according to claim 3 is characterized in that: The lower surface of the U-shaped outer fixing plate (11) is welded to the vehicle chassis (5) to form an integral body, and a U-shaped inner fixing plate (9) is welded to the inner side of the U-shaped outer fixing plate (11). The upper side surface, the left side surface and the right side surface of the U-shaped inner fixing plate (9) are respectively aligned with the edge of the U-shaped outer fixing plate (11), and the lower end of the U-shaped inner fixing plate (9) extends a section and is welded to the vehicle chassis (5) to form an integral body.

5. The AGV vehicle swing bridge structure according to claim 4, characterized in that: The U-shaped outer fixing plate (11), the double-sided bearing cover (8) and the U-shaped inner fixing plate (9) are each evenly provided with a plurality of bolt through holes at corresponding positions, and the double-sided bearing cover (8) is fastened and mounted on the U-shaped inner fixing plate (9) and the U-shaped outer fixing plate (11) after the bolts pass through the bolt through holes.

6. The AGV vehicle swing bridge structure according to claim 1, characterized in that: Steering wheel mounting plates (6) are respectively welded to both ends of the swing bridge frame (1) in the length direction, and the AGV vehicle steering wheel (7) is fixedly mounted on the steering wheel mounting plates (6).

7. An AGV vehicle, characterized in that: An AGV vehicle swing bridge structure as described in any one of claims 1 to 6 is used, comprising: a vehicle chassis (5), an AGV vehicle swing bridge structure, an upper fixed panel (13), an upper lifting panel (14) and a lifting mechanism (15), wherein the AGV vehicle swing bridge structure is installed at one end of the vehicle chassis (5), and a pair of AGV vehicle steering wheels (7) are installed on the lower surface of the other end of the vehicle chassis (5) through a steering wheel mounting plate (6); a plurality of groups of parallel lifting mechanisms (15) are installed on the upper surface of the vehicle chassis (5), the upper lifting panel (14) is fixedly installed at the lifting end of the lifting mechanism (15), and the upper fixed panel (13) is fixedly installed on the upper surface of the vehicle chassis (5) between the upper lifting panels (14).

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