A lifting platform support arm mechanism, lifting device and vehicle body transfer system

Abstract

The present application relates to a kind of lifting platform arm mechanism, lifting device and car body transfer system, belong to the field of automobile assembly, solve the current problem of insufficient carrying capacity of arm mechanism, including two rotating shafts, the bottom of two rotating shafts is fixedly connected with bottom plate, and the rotating shaft is perpendicular to the bottom plate, the rotating shaft is rotatably connected with one end of arm to make the arm can swing, the other end of the arm is used to support car body, the arm is connected with the swing driving element connected in mounting seat, the swing driving element can drive arm swing, the mounting seat is fixed on bottom plate, connecting plate is provided between the top of two rotating shafts, the connecting plate is detachably fixedly connected with the top of rotating shaft by fixed component, the arm mechanism of the present application has strong carrying capacity.

Description

Technical Field

[0001] This invention relates to the field of automobile assembly technology, specifically to a lifting platform support arm mechanism, a lifting device, and a vehicle body transfer system. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] In the chassis transfer process on the automobile assembly line, vehicles are transferred onto the chain conveyor using a lift and a hoisting platform. Due to the introduction of hybrid new energy vehicles, the vehicle body is significantly heavier than traditional gasoline vehicles, typically by 300-500 kg. In existing technologies, the increased gravity on the hoisting platform's support arms during the transfer process results in insufficient load-bearing capacity, failing to meet production requirements.

[0004] When the lifting platform support arm exceeds its own load-bearing capacity, the stress on its rotating shaft and support arm becomes excessive, causing deformation and cracking. When the deformation reaches a certain extent, it can cause equipment interference and jamming; in severe cases, the rotating shaft and support arm body may crack, and if the rotating shaft and support arm body break apart, it can cause serious equipment safety accidents such as the vehicle body falling off. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a lifting platform support arm mechanism, a lifting platform, and a vehicle body transfer system. This addresses the issue of insufficient load-bearing capacity leading to deformation and cracking during vehicle body lifting, thereby improving the safety of the vehicle body during transfer, reducing unplanned downtime, and increasing production efficiency.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, embodiments of the present invention provide a lifting platform support arm mechanism, including two rotating shafts. The bottom ends of the two rotating shafts are fixedly connected to a base plate, and the axial direction of the rotating shafts is perpendicular to the base plate. The rotating shafts are rotatably connected to one end of the support arm so that the support arm can swing. The other end of the support arm is used to support the vehicle body. The support arm is connected to a swing drive component connected to a mounting base. The swing drive component can drive the support arm to swing. The mounting base is fixed to the base plate. A connecting plate is provided between the top ends of the two rotating shafts. The connecting plate is detachably fixedly connected to the top ends of the rotating shafts through a fixing component.

[0007] Optionally, the rotating shaft body has a connecting shaft coaxially arranged on its top surface. The diameter of the connecting shaft is smaller than the diameter of the rotating shaft body. Correspondingly, the end of the connecting plate has a connecting hole that matches the connecting shaft. The connecting shaft extends into the connecting hole. The fixing component is a pressure plate, which is set on the upper surface of the connecting plate. The pressure plate is detachably connected to the connecting shaft. The pressure plate presses the end of the connecting plate onto the stepped surface formed between the rotating shaft body and the connecting shaft.

[0008] Optionally, the top surface of the connecting shaft is provided with a threaded hole, and the pressure plate is provided with a fixing hole that matches the threaded hole. A threaded fastener passes through the fixing hole, and the threaded fastener is threadedly fixed to the connecting shaft through the threaded hole to fix the pressure plate and the connecting shaft in a fixed connection.

[0009] Optionally, the axial length of the connecting shaft is equal to the axial length of the connecting hole.

[0010] Optionally, the swing drive component is a linear telescopic component, the end of the fixed part of the linear telescopic component is hinged to the mounting base, and its telescopic part is hinged to the drive arm fixedly disposed on the outer side of the support arm.

[0011] Optionally, the drive arm is located at the rotatable connection end between the support arm and the rotating shaft.

[0012] Optionally, the axial length of the rotating shaft is 115mm-120mm, preferably 116mm.

[0013] Optionally, the base plate is provided with a limiting component, which can contact the support arm to limit the rotation of the support arm.

[0014] Optionally, the limiting component includes a limiting block, which is fixedly connected to a limiting block bracket, and the limiting block bracket is fixed to the base plate.

[0015] Optionally, one end of the support arm is rotatably connected to the rotating shaft, and the top surface of the other end is provided with a support block, through which the support arm applies a supporting force to the vehicle body.

[0016] Optionally, the end of the support arm is provided with a support plate, and baffles are provided on both sides of the support plate. The support block is disposed in the space between the two baffles and is fixedly connected to the support plate.

[0017] Optionally, the support arm includes an arm body, one end of which is provided with a rotating connecting seat. The rotating connecting seat has a channel, through which the rotating shaft 7 passes and is rotatably connected to the rotating connecting seat via a rotating assembly.

[0018] Optionally, the rotating assembly includes a thrust bearing and at least one radial bearing arranged sequentially from the bottom, with a spacer ring between the thrust bearing and the bottommost radial bearing, the spacer ring being sleeved on the outer circumference of the rotating shaft, and a bushing between adjacent radial bearings, the bushing being sleeved on the outer circumference of the rotating shaft.

[0019] Optionally, the base plate is a T-shaped plate, including a first base plate portion and a second base plate portion integrally disposed in the middle of the first base plate portion. One end of the second base plate portion is integrally connected to the middle of the first base plate portion, and the top surface of the other end is provided with a mounting seat. The top surfaces of the two ends of the first base plate portion are fixedly connected to the bottom surface of the rotating shaft.

[0020] Optionally, the two rotation axes are arranged symmetrically with respect to the center of the first base plate.

[0021] Secondly, embodiments of the present invention provide a lifting device, including a lifting platform, wherein the lifting portion of the lifting platform is provided with the lifting platform support arm mechanism described in the first aspect.

[0022] Optionally, the lifting platform is a scissor-type hydraulic lifting platform.

[0023] Thirdly, embodiments of the present invention provide a vehicle body swapping system, which is equipped with the lifting device described in the second aspect.

[0024] The beneficial effects of this invention are as follows: The lifting platform support arm mechanism of the present invention has a connecting plate between the top ends of two rotating shafts. The connecting plate rigidly connects the two rotating shafts. When the support arm bears the weight of the vehicle body, if the top end of either rotating shaft is subjected to a displacement force, the displacement force is transmitted to the other rotating shaft through the connecting plate. The two rotating shafts work together to resist the displacement, and the bending moment borne by a single rotating shaft is effectively dispersed through the connecting plate. The bending stress at the root of the rotating shaft is greatly reduced, thereby achieving a significant improvement in load-bearing capacity. This avoids deformation or damage to a single rotating shaft component due to overload. At the same time, when the support arm generates a downward moment while bearing the vehicle body, the connecting plate can constrain the displacement of the rotating shaft. Furthermore, relying on the fixed connection with the base plate, the force on the entire device is more even, ensuring a stable structural form even under full load, thus guaranteeing the stability and safety of the vehicle body.

[0025] The lifting platform support arm mechanism of this invention sets the axial dimension of the rotating shaft to 115mm-120mm, which is shorter than the axial dimension of the rotating shaft in traditional support arm mechanisms. The addition of the connecting plate does not increase the height of the entire support arm mechanism, reducing the exposed and interference areas of the lifting platform support arm mechanism. It accurately matches the chassis installation space of various conventional vehicle models, completely eliminating the occasional interference and jamming problems between vehicle body parts and the rotating shaft. This significantly improves the adaptability, operational stability, and safety of the lifting platform support arm mechanism. At the same time, it optimizes the overall structural layout of the equipment, significantly improving the operating accuracy and durability of the support arm mechanism.

[0026] The lifting platform support arm mechanism of this invention uses a pressure plate to press the connecting plate onto the stepped surface formed between the rotating shaft body and the connecting shaft. Compared with traditional support arm mechanisms, it only requires shortening the axial length of the rotating shaft and machining the connecting shaft. The rest of the support arm mechanism does not need to be improved, and the entire support arm mechanism does not need to be replaced. The upgrade can be completed with only simple machining processes, which significantly reduces the material cost, processing cost and labor cost of equipment modification. The overall modification investment cost is low, and the cost-effectiveness advantage is outstanding. It is suitable for the reliability upgrade of existing lifting platform support arm devices, effectively improving the load-bearing capacity of the equipment and improving the stability of the equipment. Attached Figure Description

[0027] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0028] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 This is an exploded view of the overall structure of Embodiment 1 of the present invention; Figure 3 This is a front view of the overall structure of Embodiment 1 of the present invention; Figure 4 This is a top view of the overall structure in the open state of Embodiment 1 of the present invention; Figure 5 This is a front view of the overall structure of Embodiment 3 of the present invention; Figure 6 This is a side view of the overall structure of Embodiment 3 of the present invention; Figure 7 This is a top view of the overall structure of Embodiment 3 of the present invention; Among them, 1. cylinder, 2. mounting base, 3. limiting block, 4. base plate, 5. screw, 6. connecting plate, 7. rotating shaft, 8. support arm, 9. support block, 10. lifting tool, 11. vehicle body, 12. towing device, 13. lifting platform, 14. plate chain, 15. pressure plate, 16. thrust bearing, 17. spacer ring, 18. first radial bearing, 19. second radial parking, 20. bushing. Detailed Implementation

[0029] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should be understood that the accompanying drawings and embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0030] For ease of description, the words "upper" and "lower" appearing in this invention only indicate that they are consistent with the upper and lower directions of the accompanying drawings and do not limit the structure. They are merely for the purpose of facilitating the description of this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0031] Currently, in the process of transferring the chassis to the chain conveyor 14 in the automobile final assembly line, the lifting platform support arm mechanism undertakes the core function of lifting the vehicle body 11 and cooperating with the transfer device 12 to complete the handover of the vehicle body 11. With the large-scale introduction of hybrid and pure electric new energy vehicles, the overall weight of the vehicle body 11 has generally increased by 300kg to 500kg compared with traditional fuel vehicles. This weight increase places more stringent load-bearing requirements on the rotating shaft 7 and the support arm 8 of the lifting platform support arm mechanism. In the existing structural design of the lifting platform support arm mechanism, the rotating shaft 7 serves as the rotation support foundation for the support arm 8, with its bottom end fixed on the base plate 4. The support arm 8 is sleeved on the outer circumference of the rotating shaft 7 and achieves relative rotation through a rotating component. The cylinder 1 drives the support arm 8 to swing around the rotating shaft 7 to achieve the switching between the open and retracted states. When the support arm 8 is fully open and supporting the vehicle body 11, the weight of the vehicle body 11 acts vertically on the support block 9 at the end of the support arm 8, generating a bending moment with the rotation shaft 7 as the fulcrum. This bending moment is ultimately transmitted to the rotation shaft body in the form of lateral shear force and axial pressure. Under the load conditions of traditional fuel vehicles, the above-mentioned stress state is still within the load-bearing capacity range of the rotation shaft 7; however, when the weight of the vehicle body 11 increases significantly, the bending moment and shear stress borne by the rotation shaft 7 increase significantly, and the rotation shaft body is prone to plastic deformation or even cracking failure under repeated loads. Once the rotation shaft 7 deforms, the rotation center of the support arm 8 shifts, causing the movement trajectory of the support arm 8 to deviate from the design position. This can result in interference and jamming between the support arm 8 and the surrounding structure, or even, in severe cases, the support arm 8 loses support after the rotation shaft body breaks, causing the vehicle body 11 to fall and triggering a serious equipment safety accident.

[0032] To address the aforementioned issues, this embodiment proposes a lifting platform support arm mechanism. Without increasing the height of the rotating shaft 7 or affecting the normal swinging motion of the support arm 8, a detachable and fixed connecting plate 6 is added between the top ends of the two rotating shafts 7, forming a rigid constraint on the top ends of the two rotating shafts 7. This fundamentally changes the stress state of the rotating shafts 7, effectively improving the load-bearing capacity and rigidity of the overall structure, and solving the core problem of insufficient load-bearing capacity of the lifting platform 13 support arm device after the introduction of new energy vehicle models.

[0033] The following describes this implementation method in detail with reference to specific examples.

[0034] Example 1 This embodiment provides a lifting platform support arm mechanism, suitable for the process of transferring the chassis to the chain conveyor 14 in the automobile final assembly workshop. It is used in conjunction with the lifting platform 13 and undertakes the function of lifting and supporting the vehicle body 11 during the transfer process. Without increasing the axial height of the rotating shaft 7 or affecting the normal swinging motion of the support arm 8 around the rotating shaft 7, a connecting plate 6 is added between the top ends of the two rotating shafts 7 and a detachable fixed connection is achieved. This forms a rigid constraint at the top ends of the two originally independent rotating shafts 7, which structurally eliminates the bending moment and offset tendency of the vehicle body 11's weight on the rotating shaft 7 when the support arm 8 is open and under load. This significantly improves the overall load-bearing capacity of the lifting platform support arm mechanism and ensures the stability of equipment operation and the safety of vehicle body 11 transfer during the transfer process of new energy vehicles.

[0035] like Figures 1-4 As shown, the lifting platform support arm mechanism consists of a base plate 4, two rotating shafts 7, two support arms 8, two swing drive components, a mounting base 2, and a connecting plate 6.

[0036] The base plate 4 serves as the installation foundation for the entire mechanism, fixed to the lifting section of the lifting platform 13, providing a unified installation reference surface for all functional components.

[0037] The bottom ends of the two rotating shafts 7 are fixedly connected to the base plate 4 respectively. The axis of the rotating shafts 7 is perpendicular to the base plate 4, that is, the rotating shafts 7 extend in the vertical direction, forming two vertical support columns above the base plate 4.

[0038] Each rotating shaft 7 is rotatably connected to one end of a support arm 8. The support arm 8 can swing in the horizontal plane with the rotating shaft 7 as the center. The other end of the support arm 8 is used to support the vehicle body 11.

[0039] Mounting base 2 is fixed on base plate 4. Swing drive is connected to mounting base 2. Swing drive is connected to support arm 8 and can drive support arm 8 to swing around rotation axis 7, realizing the reciprocating switching of support arm 8 between support position and avoidance position.

[0040] A connecting plate 6 is provided between the top ends of the two rotating shafts 7. The connecting plate 6 is detachably and fixedly connected to the top ends of the rotating shafts 7 through a fixing component, forming a rigid connection between the two rotating shafts 7 at the top ends. This allows the two rotating shafts 7 to constrain each other and cooperate in bearing the bending moment transmitted by the support arm 8, thus preventing the single rotating shaft 7 from deforming or cracking due to overload.

[0041] In this embodiment, the two rotating shafts 7, which were originally independently supported, are connected by the top connecting plate 6 to form an integral frame structure.

[0042] When the support arm 8 is in the open state and carries the vehicle body 11, the weight of the vehicle body 11 is transferred to the support arm 8, and the support arm 8 then transfers the load to the rotating shaft 7 in the form of bending moment and vertical force.

[0043] In the traditional scheme without the connecting plate 6, each rotating shaft 7 independently bears the bending moment from its corresponding support arm 8. The top of the rotating shaft 7 tends to shift horizontally under the action of the bending moment. As the load increases, plastic deformation occurs when the bending stress at the root of the rotating shaft 7 exceeds the yield strength of the material.

[0044] In this embodiment, the connecting plate 6 rigidly connects the top ends of the two rotating shafts 7. When the top end of any rotating shaft 7 is subjected to a horizontal offset force, the offset force is transmitted to the other rotating shaft 7 through the connecting plate 6. The two rotating shafts 7 work together to resist the offset, and the bending moment borne by a single rotating shaft 7 is effectively dispersed. The bending stress at the root of the rotating shaft 7 is greatly reduced, thereby achieving a significant improvement in load-bearing capacity without increasing the cross-sectional size and axial height of the rotating shaft 7.

[0045] The connecting plate 6 also constrains the relative position of the two rotating shafts 7 to prevent relative displacement of the two rotating shafts 7 under long-term load, thus ensuring the stability of the movement trajectory and repeatability of the support arm 8.

[0046] The connecting plate 6 is detachably and fixedly connected to the top of the rotating shaft 7 through a fixing component. On the one hand, the detachable connection method facilitates the individual disassembly and replacement of the connecting plate 6, and the rotating shaft body does not need to be disassembled during equipment maintenance or upgrades, reducing maintenance costs and downtime. On the other hand, for the reliability upgrade of the existing lifting platform support arm mechanism, the modification can be completed by simply changing the top structure of the axial length of the rotating shaft 7, adding the connecting plate 6 and the fixing component, while retaining the original rotating shaft 7 and support arm 8 structure. The modification workload is small, the investment cost is low, and the applicability is wide.

[0047] The rotating shaft 7 includes a rotating shaft body, and a connecting shaft is coaxially provided on the top surface of the rotating shaft body. The diameter of the connecting shaft is smaller than the diameter of the rotating shaft body, thereby forming an annular stepped surface between the rotating shaft body and the connecting shaft. The annular stepped surface faces upward and is perpendicular to the axial direction of the rotating shaft 7.

[0048] Each end of the connecting plate 6 has a connecting hole. The inner diameter of the connecting hole matches the outer diameter of the connecting shaft. During installation, the connecting shaft extends into the connecting hole from below. The lower surface of the end of the connecting plate 6 sits on the step surface. The step surface provides an axial support reference for the connecting plate 6, ensuring that the connecting plate 6 is in a horizontal state after installation and maintains a defined axial positional relationship with the top surface of the rotating shaft body.

[0049] The fixing component adopts a pressure plate 15, which is set on the upper surface of the connecting plate 6. The pressure plate 15 is detachably connected to the connecting shaft. The pressure plate 15 presses the end of the connecting plate 6 against the annular stepped surface formed between the rotating shaft body and the connecting shaft. The pressure force of the pressure plate 15 clamps and fixes the end of the connecting plate 6 in the axial direction, preventing the connecting plate 6 from displacing in the axial direction when under load.

[0050] In this embodiment, a composite fixing method is adopted, in which the rotating shaft body and the connecting shaft are positioned and pressed by the step surface positioning pressure plate 15. This method not only utilizes the step surface to achieve precise axial positioning of the end of the connecting plate 6, but also ensures reliable fixing between the connecting plate 6 and the top of the rotating shaft 7 by the clamping force applied by the pressure plate 15. At the same time, the fit relationship of the connecting shaft extending into the connecting hole also constrains the radial position of the end of the connecting plate 6 in the horizontal plane, preventing the connecting plate 6 from sliding relative to the top of the rotating shaft 7 in the horizontal plane. Thus, the connecting plate 6 and the top of the rotating shaft 7 are fully constrained in the axial and radial directions.

[0051] The pressure plate 15 is fixed to the top surface of the connecting shaft in a detachable manner, specifically: The top surface of the connecting shaft has a threaded hole, and the pressure plate 15 has a fixing hole that matches the threaded hole. A threaded fastener passes through the fixing hole and is threadedly fixed to the connecting shaft through the threaded hole, thereby fixing the pressure plate 15 to the connecting shaft.

[0052] In this embodiment, the threaded fastener is a screw 5 or a bolt. Preferably, a screw 5 is used. The shank of the screw 5 passes through the fixing hole on the pressure plate 15 and is screwed into the threaded hole on the top surface of the connecting shaft. The head of the screw 5 is in contact with the upper surface of the pressure plate 15. By tightening the screw 5, the pressure plate 15 is pressed tightly against the upper surface of the connecting plate 6, thereby clamping the end of the connecting plate 6 between the lower surface of the pressure plate 15 and the step surface.

[0053] In this embodiment, the pressure plate 15 is disassembled and fixed to the top surface of the connecting shaft by screws 5. On the one hand, the disassembly and assembly operation is simple, and only general tools are needed to complete the installation and disassembly of the pressure plate 15. On the other hand, the connection is reliable, and the thread preload can be adjusted according to the actual load requirements. At the same time, the threaded connection has a certain self-locking property, and it is not easy to loosen under vibration and impact loads, thus ensuring long-term reliable fixation between the connecting plate 6 and the top of the rotating shaft 7.

[0054] During actual installation, first, fit the connecting holes at both ends of the connecting plate 6 onto the connecting shafts of the two rotating shafts 7, so that the lower surface of the end of the connecting plate 6 rests on the stepped surface. Then, place the pressure plate 15 on the upper surface of the connecting plate 6 and align it with the positions of the fixing holes and threaded holes. Finally, screw the screws 5 through the fixing holes and into the threaded holes in sequence and tighten them to complete the installation and fixing of the connecting plate 6. Disassembly is performed in the reverse order. The entire disassembly and assembly process requires no special tools and is easy to operate.

[0055] In this embodiment, multiple screws 5 are used to fix the pressure plate 15 to the top surface of the connecting shaft to ensure the reliability of the fixation. Preferably, three screws 5 are used, and the three screws 5 are distributed in a triangle.

[0056] It is understandable that screw 5 can also be four or five, and those skilled in the art can set it according to actual needs.

[0057] Furthermore, the axial length of the connecting shaft is equal to the axial length of the connecting hole, ensuring that the top surface of the connecting shaft and the upper surface of the connecting plate 6 are in the same plane, so that the pressure plate 15 can be in close contact with both the top surface of the connecting shaft and the upper surface of the connecting plate 6 at the same time, and the clamping force of the pressure plate 15 can be effectively transmitted to the end of the connecting plate 6, ensuring the reliability of the clamping and fixing.

[0058] In another embodiment, the axial length of the connecting shaft is less than the axial length of the connecting hole, and the top surface of the connecting shaft does not protrude from the upper surface of the connecting plate 6.

[0059] In this embodiment, if the axial length of the connecting shaft is greater than the axial length of the connecting hole, the top surface of the connecting shaft will protrude above the upper surface of the connecting plate 6, and the pressure plate 15 will only contact the top surface of the connecting shaft and will not be able to effectively press the connecting plate 6. Therefore, the dimensional design of the connecting shaft having an axial length equal to or less than the axial length of the connecting hole is a key geometric condition to ensure the reliable installation of the connecting plate 6.

[0060] The swing drive component adopts a linear telescopic component. The fixed part of the linear telescopic component is hinged to the mounting base 2, and its telescopic part is hinged to the drive arm fixedly installed on the outer side of the support arm 8.

[0061] In this embodiment, the linear telescopic component uses a cylinder 1, with the cylinder body of the cylinder 1 serving as the fixed part and the piston rod of the cylinder 1 serving as the telescopic part.

[0062] The end of the cylinder body of cylinder 1 is hinged to the mounting base 2 via a hinge seat, allowing cylinder 1 to change angle with the movement of the support arm 8 during its swing, adapting to the dynamic changes in the direction of the driving force during the swing of the support arm 8, and preventing additional bending moment from being generated in cylinder 1 during its movement. The end of the piston rod is hinged to the drive arm, which is fixedly mounted on the outer side of the support arm 8.

[0063] When the piston rod of cylinder 1 extends, the thrust acts on the support arm 8 through the drive arm, driving the support arm 8 to swing outward around the rotation axis 7 to the open state; When the piston rod of cylinder 1 retracts, the pulling force acts on the support arm 8 through the drive arm, driving the support arm 8 to swing inward around the rotation axis 7 to the retracted state.

[0064] The linear telescopic component converts linear reciprocating motion into the rotational swing motion of the support arm. It has a simple structure, large driving force, and fast response speed, making it suitable for the cycle time requirements of automated production lines.

[0065] It is understood that the linear telescopic component can also be a hydraulic cylinder or an electric telescopic rod, etc., and those skilled in the art can choose according to actual needs, which will not be described in detail here.

[0066] In another embodiment, the swing drive is a cylinder 1, the piston rod of which is connected to the moving block. One side of the moving block is hinged to one end of the first connecting rod, the other end of the first connecting rod is hinged to the drive arm of one of the support arms 8, the other side of the moving block is hinged to one end of the second connecting rod, and the other end of the second connecting rod is hinged to the drive arm of the other support arm 8. The cylinder 1 can drive the moving block to make linear motion, and through the action of the first and second connecting rods, drive the two support arms 8 to swing synchronously.

[0067] Furthermore, the drive arm is located at the rotatable connection end between the support arm 8 and the rotating shaft 7, that is, the drive arm is located at the end of the support arm 8 closer to the rotating shaft 7. By placing the drive arm at the rotatable connection end between the support arm 8 and the rotating shaft 7, the point of application of the driving force of the cylinder 1 is as close as possible to the center of the rotating shaft 7. Since the drive arm is located near the rotating shaft 7, the movement trajectory of the drive arm is smaller during the swinging of the support arm 8, the stroke requirement of the cylinder 1 is relatively smaller, and the overall structure is more compact.

[0068] The drive arm is fixedly connected to the outer side of the support arm 8. The extension direction of the drive arm and the extension direction of the support arm 8 form a certain angle to ensure that the cylinder 1 can generate effective driving torque when the support arm 8 is in different swing positions, and avoid dead point positions.

[0069] The axial length of the rotating shaft 7 is 115mm to 120mm, preferably 116mm.

[0070] Compared to the traditional lifting platform support arm mechanism's rotating shaft 7, the axial length of the rotating shaft 7 in this embodiment is reduced by approximately 40mm. This reduction in height effectively increases the safety clearance between the top of the rotating shaft 7 and the components of the vehicle body 11's floor 4, eliminating the risk of occasional interference between the bottom components of the vehicle body 11 and the top of the rotating shaft 7 during the vehicle body 11's rotation process. This is of great significance for protecting the product quality of the vehicle body 11.

[0071] A limiting component is provided on the base plate 4, which can contact the support arm 8 to limit the rotation of the support arm 8.

[0072] In this embodiment, limiting components are provided at the two side ends of the base plate 4. Preferably, the two limiting components are symmetrically distributed with respect to the center of the base plate 4.

[0073] The function of the limiting component is to physically limit the swing angle of the support arm 8, prevent the support arm 8 from exceeding the designed swing range under the drive of the cylinder 1 or in case of accidents, avoid interference and collision between the support arm 8 and the surrounding structure, and provide a precise positioning reference for the open state of the support arm 8.

[0074] The limiting component includes a limiting block 3, which is fixedly connected to a limiting block 3 bracket, and the limiting block 3 bracket is fixed on the base plate 4.

[0075] The limit block 3 bracket serves as the mounting carrier for the limit block 3 and is fixed on the base plate 4, providing a stable support foundation for the limit block 3. The limit block 3 is fixedly connected to the limit block 3 bracket. The position and orientation of the limit block 3 are set according to the swing path of the support arm and the designed limit angle, so that when the support arm 8 reaches the designed limit position, its side can contact the limit block 3, and the physical blocking force provided by the limit block 3 prevents the support arm 8 from continuing to swing.

[0076] The material of the limiting block 3 can be a material with certain elasticity and wear resistance, such as polyurethane or nylon. When the support arm contacts the limiting block 3, it plays a role in buffering and absorbing vibration, reducing the impact load when the support arm is in place, extending the service life of the support arm 8 and the limiting block 3, and reducing the noise generated when the support arm is in place.

[0077] Those skilled in the art can select the acquisition of limit block 3 according to actual needs, which will not be described in detail here.

[0078] In this embodiment, by symmetrically setting two sets of limiting components on the base plate 4, the opening positions of the two support arms 8 are respectively limited, ensuring that the two support arms 8 are in symmetrical design positions when fully opened, thus ensuring the centering accuracy of the vehicle body 11 support.

[0079] In another embodiment, the limiting component can also be a proximity sensor or a limit switch. The limiting component is connected to the control system and feeds back the position signal of the support arm 8 to the control system, which serves as the basis for the control system to determine whether the support arm 8 is fully in position.

[0080] It is understandable that the limiting component can also be set up with both the limiting block 3 and the proximity sensor or limit switch. When the proximity sensor or limit switch fails, the limiting block 3 acts as a physical barrier to limit the swing and prevent the support arm 8 from swinging beyond its preset swing range.

[0081] One end of the support arm 8 is rotatably connected to the rotating shaft 7, and the top surface of the other end is provided with a support block 9. The support arm 8 applies a supporting force to the vehicle body 11 through the support block 9.

[0082] As the direct contact component between the support arm 8 and the vehicle body 11, the shape and size of the support block 9 are designed according to the geometry of the corresponding support point at the bottom of the vehicle body 11 to ensure that the contact area between the support block 9 and the support point at the bottom of the vehicle body 11 meets the load-bearing requirements. At the same time, the positioning surface of the support block 9 constrains the position of the vehicle body 11 in the horizontal plane, thereby improving the positioning accuracy of the support of the vehicle body 11.

[0083] The specific connection method between the support block 9 and the end of the support arm 8 is as follows: the end of the support arm 8 is provided with a support block support plate, and baffles are provided on both sides of the support block support plate. The support block 9 is set in the space between the two baffles and is fixedly connected to the support block support plate.

[0084] The support plate provides a bottom support surface for the support block 9, and the baffles on both sides constrain the position of the support block 9 from both sides. When installed, the support block 9 is embedded in the space between the baffles on both sides and is fixedly connected to the support plate to form a stable installation structure.

[0085] The side baffles not only constrain the lateral position of the support block 9 to prevent lateral displacement of the support block 9 during the load-bearing process, but also enhance the local rigidity of the installation area of ​​the support block 9, so that the weight of the vehicle body 11 borne by the support block 9 can be evenly transmitted to the support arm 8, reducing the local stress concentration at the end of the support arm 8.

[0086] The support block 9 and the support block support plate are fixedly connected by bolts, which makes it easy to replace the support block 9 of different specifications according to the support point position of the body 11 of different models, so as to meet the needs of multi-model mixed production line production.

[0087] The support arm 8 includes an arm body, one end of which is provided with a rotating connecting seat. The rotating connecting seat has a channel, through which the rotating shaft 7 passes and is rotatably connected to the rotating connecting seat via a rotating component.

[0088] The rotating connecting seat is a structure that enables a rotatable connection between the support arm 8 and the rotating shaft 7. The rotating connecting seat is integrally formed or fixedly connected to the arm body, forming part of the support arm 8 as a whole. Preferably, the rotating connecting seat and the arm body are integrally formed structures.

[0089] Furthermore, multiple reinforcing plates are provided between the arm body and the rotating connecting seat. By setting the reinforcing plates, the structural strength of the entire support arm is increased, and the load-bearing capacity of the support arm is improved.

[0090] The rotating connecting seat has a channel extending axially along the rotating shaft 7. The inner diameter of the channel matches the outer diameter of the rotating component. The rotating shaft 7 passes through the channel and forms a rotating engagement relationship with the rotating connecting seat through the rotating component in the channel, so that the support arm 8 can rotate smoothly in the horizontal plane with the rotating shaft 7 as the fixed axis.

[0091] The rotating assembly is located between the outer periphery of the rotating shaft 7 and the inner wall of the rotating connection seat channel, and is responsible for transmitting radial and axial loads.

[0092] The rotating assembly includes a thrust bearing 16 and at least one radial bearing arranged sequentially from the bottom, the thrust bearing 16 and the radial bearing being sleeved on the outer periphery of the rotating shaft 7 and located inside the channel.

[0093] A spacer ring 17 is provided between the thrust bearing 16 and the lowest radial bearing. The spacer ring 17 is sleeved on the outer circumference of the rotating shaft 7. A bushing 20 is provided between adjacent radial bearings. The bushing 20 is sleeved on the outer circumference of the rotating shaft 7.

[0094] The thrust bearing 16 and the radial bearing are positioned axially on the rotating shaft 7 by means of spacer ring 17 and bushing 20.

[0095] The thrust bearing 16 is located at the bottom of the rotating assembly. The bottom surface of the thrust bearing 16 is in contact with the upper surface of the base plate 4 to withstand the axial pressure generated by the support arm when it supports the vehicle body 11.

[0096] When the support arm 8 bears the weight of the vehicle body 11, the weight of the vehicle body 11 is transmitted to the support arm through the support block 9. The resultant force of the weight of the support arm 8 and the weight of the vehicle body 11 acts downward along the axial direction of the rotation shaft 7 and acts on the thrust bearing 16. The thrust bearing 16 transmits the axial load evenly to the base plate 4 through its rolling elements, effectively preventing the support arm 8 from sinking or shifting in the axial direction and ensuring the axial positioning accuracy of the support arm 8.

[0097] The radial bearing is positioned above the thrust bearing 16 and bears the radial load generated by the support arm during swinging and under load, i.e., the lateral force perpendicular to the axis of the rotating shaft 7. The radial bearing transmits the radial load to the rotating shaft body through its rolling elements, ensuring the smoothness and coaxiality accuracy of the support arm when rotating around the rotating shaft 7.

[0098] A spacer ring 17 is provided between the thrust bearing 16 and the lowest radial bearing. The spacer ring 17 is sleeved and fixed on the outer circumference of the rotating shaft 7. The axial length of the spacer ring 17 determines the axial distance between the thrust bearing 16 and the lowest radial bearing.

[0099] In this embodiment, on the one hand, the spacer ring 17 provides precise axial positioning for the thrust bearing 16 and the radial bearing, ensuring that the two bearings are in the correct axial position on the rotating shaft 7 and avoiding axial movement between the bearings; on the other hand, the spacer ring 17 separates the thrust bearing 16 and the radial bearing in the axial direction, so that the two bearings independently bear their corresponding load components, avoiding mutual interference between axial load and radial load, and improving the working efficiency and service life of each bearing.

[0100] A bushing 20 is provided between adjacent radial bearings. The bushing 20 is fitted and fixed on the outer circumference of the rotating shaft 7. The axial length of the bushing 20 determines the axial distance between adjacent radial bearings.

[0101] The bushing 20 also serves to provide axial positioning and load isolation. By properly setting the axial length of the bushing 20, multiple radial bearings can be evenly distributed in the axial direction of the rotating shaft 7, increasing the span of radial load bearing and improving the radial stiffness and stability of the bracket rotation connection.

[0102] When the support arm 8 carries the body 11, the radial bearing needs to withstand a large radial bending moment. By using multiple radial bearings and appropriately separating them through the bushing 20, the radial force generated by the radial bending moment on each bearing can be effectively dispersed, the peak force of a single bearing can be reduced, and the fatigue life of the bearing can be extended.

[0103] In this embodiment, two radial bearings are provided, namely a first radial bearing 18 and a second radial bearing 19. It can be understood that three or more radial bearings can also be provided, depending on the length of the rotating shaft 7, which will not be described in detail here.

[0104] The aforementioned rotating components form an axially stacked structure along the rotation axis 7—thrust bearing 16, spacer ring 17, first radial bearing 18, bushing 20, and second radial bearing 19, which together constitute a complete composite bearing support system. Under the condition of limited axial height of the rotation axis 7, it achieves classified bearing and efficient transmission of axial and radial loads of the support arm.

[0105] The rotating component and the connecting plate 6 work together to constrain the top of the rotating shaft 7, improving the overall load-bearing capacity of the rotating shaft 7 and the support arm connection structure from both the bottom support and the top constraint directions, thus forming a complete structural reinforcement system.

[0106] The specific installation process of the rotating assembly is as follows: First, the thrust bearing 16 is fitted into the bottom of the rotating shaft 7, so that the lower end face of the thrust bearing 16 contacts the upper surface of the base plate 4; then, the spacer ring 17, the first radial bearing 18, the bushing 20, and the second radial bearing 19 are fitted in sequence; the inner rings of the first radial bearing 18 and the second radial bearing 19 are fitted and fixed with the rotating shaft 7; finally, the rotating connecting seat of the support arm is fitted from above, so that the inner wall of the channel of the rotating connecting seat is fitted with the outer ring of each bearing, thus completing the assembly of the rotating assembly.

[0107] In this embodiment, the base plate 4 is a T-shaped plate, including a first base plate portion and a second base plate portion integrally disposed in the middle of the first base plate portion.

[0108] One end of the second base plate is integrally connected to the middle of the first base plate, and the top surface of the other end is provided with a mounting base 2. The top surfaces of the two ends of the first base plate are fixedly connected to the bottom surface of the rotating shaft 7.

[0109] The first base plate extends laterally, and its two ends serve as the mounting bases for the two rotating shafts 7. The two rotating shafts 7 are fixed at both ends of the first base plate and are separated from each other in the lateral direction, providing a suitable span for the connecting plate 6 to bridging the top ends of the two rotating shafts 7.

[0110] The second base plate extends forward from the middle of the first base plate to form a vertical part of a T-shaped structure. The top surface of the other end of the second base plate is provided with a mounting seat 2, which serves as the mounting base for the swing drive component. The swing drive component extends from the mounting seat 2 to both sides and is hinged to the drive arms of the two support arms respectively.

[0111] The T-shaped base plate 4's layout positions the mounting base 2 on one side of the middle of the two rotating shafts 7. The swing drive starts from the mounting base 2 and drives the two support arms 8 to both sides respectively. The transmission path of the driving force is symmetrical and balanced, which helps to ensure the synchronous swing of the two support arms 8. At the same time, the T-shaped base plate 4 concentrates the mounting areas of the rotating shafts 7 and the mounting base 2 on the first base plate and the second base plate respectively. The structural layout is clear, and each functional area is independent, which facilitates installation and maintenance.

[0112] The two rotating shafts 7 are symmetrically arranged with respect to the center of the first base plate, that is, the two rotating shafts 7 are symmetrically distributed about the transverse center line of the first base plate, and the distances of the two rotating shafts 7 to the center of the first base plate are equal.

[0113] The two symmetrically arranged rotation axes 7 make the entire lifting platform support arm mechanism symmetrical in the lateral direction. The two support arms 8 swing symmetrically around their respective rotation axes 7. When in the open state, the two support arms 8 form a support posture symmetrical about the lateral center line of the mechanism, and the support force on the vehicle body 11 is evenly distributed in the lateral direction, effectively preventing the vehicle body 11 from laterally deflecting during the loading process.

[0114] The symmetrical layout also ensures that the connection points from both ends of the connecting plate 6 to their respective rotation axes 7 are subjected to the same force, and the connecting plate 6 is in a uniform stress state, which avoids torsional deformation of the connecting plate 6 due to uneven force at both ends, and ensures the structural integrity and service life of the connecting plate 6.

[0115] In the initial state, the two support arms 8 of the lifting platform support arm mechanism are in the retracted state, and the two support arms 8 swing inwards respectively, with the supporting ends of the support arms 8 retracting to the avoidance position. At this time, the piston rod of cylinder 1 is in the retracted state, and cylinder 1 applies a pulling force to the support arms 8 through the drive arm to keep the support arms in the retracted position.

[0116] When the lifting platform 13 rises to the designated height and is ready to receive the vehicle body 11, the piston rod of the cylinder 1 extends, and the thrust acts on the support arm through the drive arm, driving the two support arms to swing outward around their respective rotation axes 7.

[0117] Since the drive arm is located at the rotational connection end between the support arm and the rotating shaft 7, the thrust of the cylinder 1 generates a driving torque near the rotating shaft 7, driving the support arm 8 to swing outward smoothly. When the two support arms 8 swing to the fully open state, the support end of the support arm 8 reaches the designed support position, and the limiting block 3 in the limiting component contacts the corresponding part of the support arm, precisely limiting the open position of the support arm 8, ensuring that the support blocks 9 of the two support arms are in the correct support position of the vehicle body 11.

[0118] When the vehicle body 11 is lowered and placed on the support block 9 of the lifting platform support arm mechanism, the weight of the vehicle body 11 is transmitted to the support arm through the support block 9, and then from the support arm to the rotating shaft 7 and the rotating assembly.

[0119] This is the condition where the lifting platform support arm mechanism bears the greatest load. The weight of the vehicle body 11 generates a bending moment at the end of the support arm 8 with the rotating shaft 7 as the fulcrum. This bending moment is transmitted to the rotating shaft body in the form of radial force through the radial bearing. At the same time, the resultant force of the weight of the vehicle body 11 and the weight of the support arm 8 is transmitted to the rotating shaft body in the form of axial pressure through the thrust bearing 16.

[0120] The top of the rotating shaft 7 is subjected to radial bending moment, which causes a horizontal offset tendency. However, since the connecting plate 6 rigidly connects the tops of the two rotating shafts 7, the offset tendency of the top of the single rotating shaft 7 is transmitted to the other rotating shaft 7 through the connecting plate 6. The two rotating shafts 7 work together to resist the offset, and the bending stress at the root of the rotating shaft 7 is effectively dispersed, and the overall structure maintains a stable load-bearing state.

[0121] The connecting plate 6 is detachably fixed to the top of the rotating shaft 7 through a fixing component. When subjected to the transmitted horizontal offset force, the end of the connecting plate 6 is reliably clamped by the pressure plate 15 and the stepped surface. The fit relationship between the connecting shaft and the connecting hole constrains the horizontal displacement of the end of the connecting plate 6, ensuring that the connecting plate 6 does not loosen or shift under full load conditions and continues to perform the top constraint function.

[0122] After the vehicle body 11 is placed, the lifting platform 13 lowers the vehicle body 11. During the descent, the lifting platform support arm mechanism continuously bears the weight of the vehicle body 11, and the top constraint function of the connecting plate 6 remains effective throughout the descent.

[0123] Once the lifting platform 13 descends to the designated height, the vehicle body 11 is smoothly placed onto the chain 14, and the weight of the vehicle body 11 is transferred to the chain 14, thus releasing the load on the lifting platform support mechanism.

[0124] Afterwards, the piston rod of cylinder 1 retracts, driving the two support arms 8 to retract inwards. The support arms 8 move away from the bottom of the vehicle body 11, and the lifting platform 13 continues to descend and return to its initial position, completing a full vehicle body 11 transfer cycle. Throughout the entire working cycle, the connecting plate 6 remains fixed at the top of the two rotating shafts 7 and does not participate in the swinging motion of the support arms 8. The connecting plate 6 only serves as a structural constraint on the relative position of the top of the two rotating shafts 7 and does not interfere with the normal swinging of the support arms 8.

[0125] When both support arms 8 are in the open state and simultaneously support the vehicle body 11, the top ends of the two rotating shafts 7 are each subjected to a horizontal offset force. These two offset forces are opposite in direction and equal in magnitude (under the ideal condition where the vehicle body 11 is uniformly seated). The connecting plate 6 bears an axial tensile load under the action of these two offset forces in opposite directions. The cross-sectional dimensions and material strength of the connecting plate 6 need to be designed according to the axial tensile load under the maximum load condition to ensure that the connecting plate 6 does not yield under full load. In addition, under the eccentric load condition where the vehicle body 11 is not uniformly seated, the magnitude of the offset forces on the top ends of the two rotating shafts 7 may not be equal. In addition to bearing the axial tensile load, the connecting plate 6 will also bear bending moment. The moment of inertia of the connecting plate 6 needs to meet the requirements of bending stiffness to prevent the connecting plate 6 from undergoing excessive bending deformation under eccentric load conditions, which would affect the relative positional accuracy of the two rotating shafts 7.

[0126] The length of the connecting plate 6 is determined by the center distance between the two rotating shafts 7. The center distance between the connecting holes at both ends of the connecting plate 6 is precisely matched with the center distance between the two rotating shafts 7, ensuring that no additional lateral prestress is applied to the rotating shafts 7 after the connecting plate 6 is installed. The thickness and width of the connecting plate 6 are designed according to the load-bearing requirements. While meeting the strength and rigidity requirements, the weight of the connecting plate 6 is controlled as much as possible to reduce the increase in the overall weight of the lifting platform support mechanism.

[0127] In this embodiment, the material of the connecting plate 6 can be high-strength structural steel, such as Q345 steel, with a yield strength of not less than 345MPa. While meeting the load-bearing requirements, it also has good weldability and machinability, making it easy to manufacture and maintain.

[0128] The surface treatment of the connecting plate 6 can be achieved by spraying anti-rust paint or galvanizing, which can improve the corrosion resistance of the connecting plate 6 in the humid and dusty environment of the automobile assembly workshop and extend its service life.

[0129] The area around the connecting holes at both ends of the connecting plate 6 is a high-risk area for stress concentration. The material thickness around the connecting holes can be appropriately increased as needed, or the stress concentration factor can be reduced by increasing the local cross-sectional area around the connecting holes, thereby improving the service life of the connecting plate 6 under fatigue load.

[0130] In this embodiment, the rotating shaft body and the connecting shaft are machined from the same section of round bar. The rotating shaft body has a larger diameter and the connecting shaft has a smaller diameter. The two are connected by a stepped surface, and the axial position and radial dimension of the stepped surface are precisely controlled by the turning process.

[0131] In this embodiment, the flatness and perpendicularity accuracy of the step surface between the rotating shaft body and the connecting shaft directly affect the levelness of the connecting plate 6 after installation. Therefore, the machining accuracy of the step surface is required to be high, typically requiring a flatness of no more than 0.05mm and a perpendicularity to the axis of the rotating shaft 7 of no more than 0.05mm.

[0132] The fitting accuracy between the outer diameter of the connecting shaft and the inner diameter of the connecting hole is also crucial to ensuring the radial positioning accuracy of the connecting plate 6. In this embodiment, the connecting shaft and the connecting hole adopt a clearance fit, and the fitting clearance between the outer diameter of the connecting shaft and the inner diameter of the connecting hole is controlled within the range of 0.02mm to 0.05mm. This ensures that the connecting plate 6 can be smoothly fitted into the connecting shaft, while limiting the radial displacement of the end of the connecting plate 6 in the horizontal plane to within the allowable range.

[0133] The outer diameter of the rotating shaft body matches the inner diameter of the thrust bearing 16 and the inner diameter of the radial bearing. At the same time, the bottom end of the rotating shaft body is provided with a mounting flange or threaded structure for fixed connection with the base plate 4.

[0134] In this embodiment, the bottom end of the rotating shaft body is provided with a mounting flange, which is fixedly connected to the base plate 4 by a plurality of screws 5.

[0135] In this embodiment, the surface roughness requirement of the rotating shaft body is high. The surface roughness Ra value of the area that mates with the inner ring of the bearing is no greater than 0.8μm, to ensure that the mating surfaces between the inner ring and the rotating shaft body fit well after the bearing is installed, and that the inner ring of the bearing does not rotate relative to the bearing.

[0136] The material of the rotating shaft 7 can be high-quality carbon structural steel or alloy structural steel. After quenching and tempering heat treatment, it has good comprehensive mechanical properties. It has sufficient strength and hardness to withstand the contact stress of the bearing mating surface, and sufficient toughness to withstand impact loads and prevent brittle fracture.

[0137] In the rotating assembly, the thrust bearing 16 is used to bear axial loads. Its load-bearing capacity is determined by the rated dynamic load and rated static load of the bearing. When selecting the bearing, it is necessary to calculate based on the maximum total weight of the support arm and the body 11 to ensure that the safety factor of the thrust bearing 16 meets the requirements under full load conditions.

[0138] In this embodiment, the thrust bearing 16 is a thrust ball bearing or a thrust roller bearing. The thrust roller bearing has a higher load-bearing capacity than the thrust ball bearing and is suitable for applications with higher load-bearing capacity requirements.

[0139] Those skilled in the art can select the specific form of the thrust bearing 16 according to actual needs, which will not be described in detail here.

[0140] The thrust bearing 16 is installed at the lowest position of the rotating shaft 7. Its lower end face contacts the upper surface of the base plate 4 through a washer. The axial load is directly transmitted to the base plate 4 through the thrust bearing 16, which has a short force transmission path and high efficiency.

[0141] The radial bearing is used to bear the radial load. In the rotating assembly of the embodiment, at least one radial bearing is used, preferably two radial bearings separated by bushing 20.

[0142] Two radial bearings form a certain support span in the axial direction of the rotating shaft 7 to improve the radial stiffness of the bracket rotation connection.

[0143] When the support arm 8 supports the vehicle body 11, the weight of the vehicle body 11 generates a bending moment at the end of the support arm 8 with the rotation shaft 7 as the fulcrum. This bending moment is transmitted to the radial bearings through the rotating connecting seat of the support arm 8, generating a pair of equal and opposite radial forces (i.e., a couple) on the two radial bearings. The larger the axial distance between the two radial bearings, the longer the lever arm of the couple, and the smaller the radial force borne by each radial bearing under the same bending moment. Therefore, within the allowable range of the axial height of the rotation shaft 7, appropriately increasing the axial distance between the two radial bearings (i.e., increasing the axial length of the bushing 20) is beneficial to reducing the stress level of each radial bearing and improving the service life of the radial bearings.

[0144] The spacing between the two radial bearings can be set according to actual needs, and will not be described in detail here.

[0145] In this embodiment, the radial bearing is a deep groove ball bearing or a cylindrical roller bearing. Deep groove ball bearings can withstand a certain axial load at the same time and are suitable for situations with combined axial and radial loads. Cylindrical roller bearings have a higher radial load capacity than deep groove ball bearings and are suitable for situations with larger radial loads.

[0146] Those skilled in the art can select the type of radial bearing according to actual needs, which will not be described in detail here.

[0147] The axial length design of the spacer ring 17 needs to provide sufficient axial spacing between the thrust bearing 16 and the lowest radial bearing to prevent the thrust bearing 16 and the radial bearing from interfering with each other in the axial direction. The outer diameter of the spacer ring 17 does not exceed the outer diameter of the thrust bearing 16 and the radial bearing to prevent the spacer ring 17 from interfering with the inner wall of the channel of the rotating connection seat.

[0148] The axial length design of bushing 20 needs to ensure that there is sufficient axial spacing between the two radial bearings to form a support span that meets the requirements. The outer diameter of bushing 20 shall not exceed the outer diameter of thrust bearing 16 and radial bearing, so as to prevent bushing 20 from interfering with the inner wall of the channel of the rotating connection seat.

[0149] The spacer ring 17 and the bushing 20 can be made of ordinary carbon steel, which has sufficient wear resistance after surface treatment, and will not wear significantly during long-term operation, thus maintaining the precise axial positioning of the bearing.

[0150] The length of the horizontal part of the T-shaped plate, namely the first base plate, determines the center distance between the two rotating shafts 7, and thus determines the effective span of the connecting plate 6 and the maximum unfolded width of the two support arms in the open state.

[0151] The center distance between the two rotating shafts 7 needs to be designed according to the lateral spacing of the bottom support points of the vehicle body 11 to ensure that the lateral position of the end block 9 of the two support arms corresponds precisely to the lateral position of the bottom support points of the vehicle body 11 when the two support arms are in the open state.

[0152] The width and thickness of the first base plate are designed according to the dimensions of the mounting flange at the bottom of the rotating shaft 7 and the load-bearing requirements of the base plate 4, to ensure that the base plate 4 has sufficient rigidity and to prevent the base plate 4 from bending and deforming under load, thus affecting the verticality accuracy of the rotating shaft 7.

[0153] The dimensions of the first base plate can be set according to actual needs, and will not be described in detail here.

[0154] The longitudinal portion of the T-shaped plate, i.e., the second base plate, determines the longitudinal position of the mounting base 2 relative to the rotation axis 7, which in turn affects the mounting angle of the cylinder 1 and the force direction of the drive arm. The position of the mounting base 2 on the second base plate needs to be optimized according to the stroke of the cylinder 1 and the swing angle of the support arm 8 to ensure that the cylinder 1 can generate effective driving torque throughout the entire swing process of the support arm 8 from the retracted position to the open position, without any dead points.

[0155] The width of the second base plate needs to meet the installation area requirements of the mounting base 2, while not exceeding the width of the first base plate, to maintain the overall structural harmony of the T-shaped plate.

[0156] The T-shaped plate is formed by welding or casting steel plates, or by removing a portion of a single plate. In this embodiment, the T-shaped plate is formed by removing a portion of a single plate.

[0157] The connection area between the first and second base plates of the T-shaped plate needs to be properly reinforced to prevent fatigue cracking under long-term loads. The bottom surface of the T-shaped plate has an installation reference surface that matches the mounting surface of the lifting part of the lifting platform 13. It is fixedly connected to the lifting platform 13 through an array of bolt holes. The arrangement of the bolt holes needs to meet the requirements of connection strength and installation convenience.

[0158] In this embodiment, the base plate 4 adopts a T-shaped plate. Compared with a rectangular base plate 4 or other shaped base plates 4, the T-shaped structure reduces the amount of material used and the weight of the base plate 4 while meeting functional requirements, which helps to reduce the load on the lifting platform 13. The shape of the T-shaped structure is highly consistent with the functional layout of the lifting platform support arm mechanism. The first base plate corresponds to the lateral arrangement of the two rotating shafts 7 and the two support arms, and the second base plate corresponds to the longitudinal extension of the mounting base 2 and the cylinder 1. The projected area of ​​each functional area on the base plate 4 is fully utilized, and there is no redundant area without function. The T-shaped structure has a large moment of inertia in the lateral direction, and has good bending stiffness for bearing the bending moment transmitted by the two rotating shafts 7.

[0159] In an automated production line, the movement of cylinder 1 is automatically controlled by the control system. Under normal operating conditions, cylinder 1 drives the support arm 8 to swing according to a preset stroke and timing sequence. When the support arm 8 reaches the designed position, the control system issues a stop command to stop cylinder 1. However, in the event of a control system malfunction or abnormal conditions such as cylinder 1 overtravel, the control system may fail to issue a stop command in time, causing cylinder 1 to continue driving the support arm beyond the designed swing range. In this case, the limiting component acts as the last physical line of defense, preventing the support arm from continuing to swing through the contact between the limiting block 3 and the support arm, thus preventing the support arm from colliding with surrounding structures and protecting equipment safety.

[0160] The location and angle of the limiting components need to be determined based on the design swing range of the support arm.

[0161] For the limit of the opening position of the support arm, the limit block 3 is set at the end position of the opening direction of the support arm 8. When the support arm 8 reaches the fully open state, the side of the support arm 8 or the specially set contact surface contacts the limit block 3. The reaction force provided by the limit block 3 prevents the support arm 8 from continuing to swing outward.

[0162] By setting the opening limit block 3, the swing range of the support arm 8 can be precisely controlled.

[0163] The fixed connection between the limit block 3 and the limit block 3 bracket can be a bolt connection. By adjusting the installation position of the limit block 3 on the limit block 3 bracket, the limiting angle of the support arm can be finely adjusted to adapt to the differences in the swing range of the support arm under different vehicle models or different process requirements.

[0164] The fixed connection between the limit block 3 bracket and the base plate 4 needs to have sufficient strength to withstand the impact force generated when the support arm 8 reaches the limit position at maximum speed, so as to prevent the limit block 3 bracket from deforming or loosening under the impact force and affecting the limit accuracy.

[0165] In addition to the aforementioned polyurethane or nylon materials, the limiting block 3 can also be made of rubber materials depending on the specific working conditions. Rubber materials have a lower elastic modulus and better buffering and vibration absorption effects, making them suitable for situations where the support arm has a high positioning speed or a large impact load.

[0166] The installation height of the limit block 3 needs to match the contact surface height of the support arm 8 to ensure that the limit block 3 can contact the contact surface of the support arm 8 at the same horizontal level, so as to avoid the reduction of contact area or the generation of additional torque due to height difference.

[0167] In this embodiment, the support block 9 and the support block support plate are connected by bolts, which realizes the detachable connection between the support block 9 and the support block support plate. For different vehicle models, the support block 9 of different specifications can be replaced to adapt to the differences in the shape and position of the support point of the vehicle body 11. The bolt connection between the support block 9 and the support block support plate facilitates the quick replacement of the support block 9 and reduces the adjustment time when switching vehicle models.

[0168] The height of the support block 9 determines the effective support height at the end of the support arm 8. The design of the height of the support block 9 needs to be coordinated with the lifting stroke of the lifting platform 13 and the vehicle placement height of the transfer device 12 to ensure that the top surface of the support block 9 is at the correct vehicle placement height when the lifting platform 13 reaches the designated height.

[0169] The mounting groove structure of the support block 9, which consists of the support plate and the baffle, not only precisely constrains the installation position of the support block 9, but also provides good lateral support for the support block 9, preventing the support block 9 from lateral displacement due to lateral force during the bearing process.

[0170] The height of the baffle needs to be less than the height of the support block 9 to ensure that the baffle can provide effective lateral restraint on the side of the support block 9, while preventing the baffle from interfering with the structure of the vehicle body 11; the thickness of the baffle needs to meet the strength requirements for bearing lateral forces to prevent the baffle from bending and deforming under the action of lateral forces.

[0171] The thickness of the baffle can be set according to actual needs, and will not be described in detail here.

[0172] When the boom 8 supports the vehicle body 11, its stress state is similar to that of a cantilever beam. With the rotation shaft 7 as the fixed end, the support block 9 end bears a concentrated load, and the boom section is subjected to a combination of bending moment and shear force. The bending moment of the boom section gradually increases from the support block 9 end to the rotation shaft 7 end, and the bending moment is the largest at the section near the rotation shaft 7. Therefore, the design of the boom section size needs to use the maximum bending moment at the section near the rotation shaft 7 as the control condition.

[0173] The boom can be made of rectangular or I-shaped cross-section. Rectangular cross-section is easy to process and has good torsional resistance; I-shaped cross-section has a larger moment of inertia for the same cross-sectional area, higher bending stiffness, and lighter weight, making it suitable for applications with strict weight requirements.

[0174] Preferably, in this embodiment, the arm body has a rectangular cross-section.

[0175] The boom body can be made of high-strength structural steel, which has good comprehensive mechanical properties after quenching and tempering.

[0176] Furthermore, the surface of the boom can be reinforced with stiffeners or a variable cross-section design can be adopted. The cross-section size can be appropriately increased in areas with large bending moments and appropriately decreased in areas with small bending moments to achieve a reasonable distribution of materials and minimize the weight of the boom while meeting strength requirements.

[0177] The stress state in the connection area between the rotating connector and the boom is relatively complex. Reinforcing plates or ribs are typically installed in this connection area to increase local stiffness and strength, thereby improving fatigue life.

[0178] Preferably, the rotating connecting seat and the arm body can be integrally cast to avoid residual welding stress and weld defects that may be introduced by welding, thereby improving the structural integrity of the connection area.

[0179] The assembly method of the lifting platform support arm mechanism in this embodiment is as follows: First, fix the base plate 4 onto the lifting part of the lifting platform 13, using the base plate 4 as the reference for the subsequent installation of other components.

[0180] Next, the two rotating shafts 7 are installed at the two ends of the base plate 4 respectively. The mounting flanges at the bottom of the rotating shafts 7 are fixedly connected to the base plate 4 with bolts. During installation, the verticality of the rotating shafts 7 needs to be corrected to ensure that the perpendicularity of the axis of the rotating shafts 7 to the plane of the base plate 4 meets the design requirements. Then, the rotating components (thrust bearing 16, spacer ring 17, radial bearing, and bushing 20) are sequentially fitted onto the rotating shaft 7, and the rotating connecting seat of the support arm is fitted from above to complete the rotating connection assembly between the support arm 8 and the rotating shaft 7. After assembly, check the swing flexibility of the support arm 8. Manually push the support arm 8 to swing around the rotating shaft 7. The support arm 8 should be able to rotate smoothly without jamming or abnormal resistance.

[0181] Next, the mounting base 2 is fixed to the top surface of the second base plate, the cylinder body end of the cylinder 1 is hinged to the mounting base 2, and the piston rod end of the cylinder 1 is hinged to the drive arm on the support arm 8 to complete the installation of the swing drive component. Then, the connecting holes at both ends of the connecting plate 6 are respectively fitted into the connecting shafts of the two rotating shafts 7. The end of the connecting plate 6 is placed on the stepped surface. The pressure plate 15 is placed on the upper surface of the connecting plate 6 and fixed to the top surface of the connecting shaft with screws 5 to complete the installation of the connecting plate 6. Finally, fix the limit block 3 bracket to the base plate 4, fix the limit block 3 to the limit block 3 bracket, and adjust the position of the limit block 3 to ensure that the support arm can accurately contact the limit block 3 when it reaches the designed limit position.

[0182] After assembly, check the reliability of cylinder 1's operation. Supply air to cylinder 1 and observe the swinging process of support arm 8 driven by cylinder 1. Support arm 8 should be able to swing smoothly from the retracted position to the open position and reliably contact the limit block 3 after it is in place. Check the installation reliability of connecting plate 6. Shake connecting plate 6 forcefully. Connecting plate 6 should not loosen or shift.

[0183] The lifting platform support arm mechanism of this embodiment, by setting a detachable and fixed connecting plate 6 between the top ends of the two independent rotating shafts 7, rigidly connects the two rotating shafts 7 at their top ends. This fundamentally changes the force-bearing mode of a single rotating shaft 7, transforming the cantilever beam force-bearing mode into a frame force-bearing mode with constraints at both ends. Without increasing the cross-sectional dimensions or height of the rotating shafts 7, a significant improvement in load-bearing capacity is achieved through structural optimization. Furthermore, the detachable connection design makes the technical solution of this embodiment applicable not only to newly designed lifting platform 13 support arm devices, but also as an upgrade and modification solution for existing equipment. By processing the existing rotating shafts 7 to shorten their axial length, and adding a connecting shaft and installing the connecting plate 6 at their top ends after installation, a significant improvement in the load-bearing capacity of existing equipment can be achieved. This approach has low modification costs, short downtime, and broad engineering application value.

[0184] Meanwhile, since the top constraint of the connecting plate 6 effectively disperses the force on the rotating shaft 7, the deformation of the rotating shaft 7 under the same load is greatly reduced, the force on each bearing in the rotating assembly is also reduced accordingly, the friction torque of the bearing is reduced, the driving torque required for the swing arm is reduced, and the working pressure and air consumption of the cylinder 1 are reduced accordingly, which is conducive to reducing the energy consumption of the production line.

[0185] The reduction in deformation of the rotating shaft 7 also helps to improve the working accuracy of the rotating components, reduce abnormal wear of the bearings, extend the maintenance cycle of the rotating components, and reduce spare parts consumption and maintenance costs.

[0186] From a life-cycle perspective, the lifting platform support mechanism in this embodiment improves equipment reliability and reduces maintenance costs through structural optimization. Upgrades can be completed with only simple machining processes, significantly reducing material, processing, and labor costs for equipment modification. The overall modification investment is low, with outstanding cost-effectiveness. It is suitable for reliability upgrades of existing lifting platform support devices, effectively improving equipment load-bearing capacity and stability, bringing significant economic benefits to users and having good market application prospects.

[0187] Example 2 This embodiment provides a lifting device, which includes a lifting platform 13. The lifting part of the lifting platform 13 is provided with the lifting platform support arm mechanism described in Embodiment 1.

[0188] In this embodiment, the lifting portion of the lifting platform 13 is provided with two lifting platform support arm mechanisms as described in Embodiment 1, and the two lifting platform support arm mechanisms are arranged in a row.

[0189] In this embodiment, the lifting device integrates the lifting platform 13 with the lifting platform support arm mechanism to form an integrated device with complete lifting and body 11 support functions, which is suitable for the body 11 transfer process from the chassis line to the plate chain 14 in the automobile final assembly workshop.

[0190] As the driving component of the lifting device, the lifting platform 13 is responsible for lifting the lifting platform support arm mechanism from a low position to a high position and smoothly lowering the vehicle body 11 to the plate chain 14 after the handover of the vehicle body 11 is completed.

[0191] The lifting section of the lifting platform 13 is a platform area that rises and falls together with the lifting action above the lifting platform 13. The lifting platform support arm mechanism is installed on the lifting section of the lifting platform 13 and rises and falls synchronously with the lifting action of the lifting platform 13. After the lifting platform 13 rises to the designated height, the lifting platform support arm mechanism is in the correct vehicle body 11 receiving position, and its support arm is in the open state to receive the vehicle body 11 from the transfer device 12.

[0192] The lifting platform 13 adopts a scissor-type hydraulic lifting platform. Existing equipment can be used for the scissor-type hydraulic lifting platform, and its specific structure will not be described in detail here.

[0193] A scissor lift is a type of lifting equipment that uses a hydraulic cylinder as its power source and a scissor hinge mechanism as its transmission mechanism. Its main features are a large lifting stroke, strong load-bearing capacity, smooth operation, compact structure, and small footprint.

[0194] The scissor arms of the scissor-type hydraulic lifting platform are composed of several sets of X-shaped hinge components connected in series. The extension and retraction of the hydraulic cylinder drives the scissor arms to extend or retract, thereby realizing the lifting of the platform 13.

[0195] The transmission characteristics of the scissor lift structure make the lifting platform 13 move at a uniform speed without impact during the lifting process. During the descent, the hydraulic system can be used to control the throttling to achieve a two-stage descent control, which first descends quickly to near the target height and then descends slowly to the precise position. This meets the process requirements of placing the vehicle body 11 smoothly onto the chain 14 and avoids impact between the vehicle body 11 and the chain 14 due to excessive descent speed.

[0196] The load-bearing capacity of the scissor lift is matched with the weight of the new energy vehicle body 11. The working pressure of the hydraulic system and the cylinder diameter of the hydraulic cylinder are selected according to the maximum load-bearing weight to ensure that the lifting platform 13 can reliably lift and stably maintain its height under full load conditions.

[0197] Understandably, the lifting platform 13 may also employ multiple hydraulic cylinders, with the piston rods of the multiple hydraulic cylinders connected to the lifting plate.

[0198] Those skilled in the art can set the specific form of the lifting platform 13 according to actual needs, and will not be described in detail here.

[0199] The lifting stroke of the lifting platform 13 is designed according to the height requirements of the transfer process, ensuring that when the lifting platform 13 is raised to its highest position, the height of the support block 9 of the lifting platform support arm mechanism matches the height at which the vehicle body 11 is placed on the transfer device 12, allowing the vehicle body 11 to accurately sit on the support block 9. The platform dimensions of the lifting platform 13 match the dimensions of the base plate 4 of the lifting platform support arm mechanism. The base plate 4 of the lifting platform support arm mechanism is fixed to the lifting part of the lifting platform 13 by bolts, ensuring a reliable connection and facilitating installation and disassembly.

[0200] The lifting platform support arm mechanism is installed after the lifting part of the scissor lift platform. The lifting platform support arm mechanism rises and falls synchronously with the lifting platform 13, and the two form a complete lifting and support system.

[0201] During the vehicle body 11 transfer process, the lifting platform 13 rises from a low position, and at the same time, the support arm of the lifting platform support arm mechanism opens to the support position. After the lifting platform 13 rises to the designated height, the transfer device 12 lowers the vehicle body 11 and places it on the support block 9 of the lifting platform support arm mechanism. The lifting platform support arm mechanism bears the entire weight of the vehicle body 11.

[0202] At this time, the hydraulic system of the lifting platform 13 maintains pressure to keep the height of the lifting platform 13 stable. The connecting plate 6 in the lifting platform support arm mechanism ensures that the support arm maintains a stable supporting posture under full load by constraining the top ends of the two rotating shafts 7, without deformation or displacement. Then the lifting platform 13 lowers with the car body 11 and places the car body 11 smoothly onto the plate chain 14, completing the transfer of the car body 11 from the suspended conveyor line to the ground plate chain 14.

[0203] The scissor lift hydraulic platform provides a smooth lifting function with a large stroke and high load capacity; the lifting platform support arm mechanism provides a high load capacity vehicle body support function through the top constraint of the two rotating shafts 7 by the connecting plate 6; the combination of the two forms a complete lifting device that can meet the requirements of the new energy vehicle transfer process.

[0204] The lifting device in this embodiment has a compact structure, strong load-bearing capacity, and stable and reliable operation. It is suitable for long-term stable operation under the production rhythm requirements of automobile assembly workshops, effectively reducing the risk of unplanned downtime caused by insufficient load-bearing capacity of the lifting platform support arm mechanism, and improving the operating efficiency and reliability of the production line.

[0205] The lifting platform support arm mechanism is fixedly connected to the lifting part of the lifting platform 13 via the base plate 4. The connection between the base plate 4 and the lifting platform 13 is a detachable bolt connection, which facilitates the overall replacement of the lifting platform support arm mechanism during equipment overhaul or upgrade.

[0206] The connecting plate 6 in the lifting platform support arm mechanism is detachably and fixedly connected to the top of the rotating shaft 7 through a fixing component. During routine maintenance, the connecting plate 6 can be disassembled separately for inspection and replacement without disassembling the entire lifting platform support arm mechanism, making maintenance convenient and reducing downtime.

[0207] Routine maintenance of hydraulic systems includes regularly checking the hydraulic oil level and quality, checking the sealing condition of hydraulic cylinder seals, and checking the reliability of hydraulic pipeline connections to ensure that the hydraulic system maintains good working condition during long-term operation.

[0208] Compared with conventional lifting devices, the lifting device in this embodiment has the following advantages: The load-bearing capacity is significantly enhanced. Because the top constraint of the connecting plate 6 in the lifting platform support mechanism forms an integral frame for the two rotating shafts 7 to bear the force, the bending stress of a single rotating shaft 7 is greatly reduced, and the overall load-bearing capacity is significantly improved. It can meet the load-bearing requirements of the transfer process after the weight of the new energy vehicle body 11 increases by 300kg to 500kg, and eliminate the safety hazards caused by overload deformation or cracking of the rotating shaft 7.

[0209] The equipment height dimensions have been optimized and controlled. The axial length of the rotating shaft 7 has been reduced by approximately 40mm, and the overall height of the lifting platform support arm mechanism has been reduced accordingly. The safety clearance between the top of the rotating shaft 7 and the components of the chassis 11 floor 4 has been increased. The risk of accidental interference between the bottom components of the chassis 11 and the top of the rotating shaft 7 during the chassis 11 swapping process has been effectively eliminated, which helps to protect the integrity of the bottom components of the chassis 11 and improve the product quality of the chassis 11.

[0210] The maintainability of the equipment has been improved. The connecting plate 6 is installed on the top of the rotating shaft 7 by a detachable fixed connection. During routine maintenance, the connecting plate 6 can be inspected and replaced separately without disassembling the rotating shaft 7 and the support arm. The maintenance operation is simple, the downtime is short, and it is conducive to improving the operating efficiency of the production line.

[0211] The modification cost is low. Upgrading the existing lifting platform support arm mechanism only requires shortening the axial length of the existing rotating shaft 7 and adding a connecting shaft at the top of the rotating shaft 7 (achieved by machining and modifying the top of the rotating shaft 7), and installing the connecting plate 6 and pressure plate 15. The modification workload is small, the required spare parts are few, and the modification cost is far lower than the solution of replacing the entire lifting platform support arm mechanism, which has significant economic advantages.

[0212] In the actual application of the lifting device in the automobile assembly workshop, it is necessary to make precise spatial coordination and timing with peripheral equipment such as the transfer device 12, the lifting gear 10 and the plate chain 14.

[0213] The installation position of the lifting platform 13 needs to be precisely aligned with the working area of ​​the towing device 12 on the plane projection, ensuring that when the towing device 12 places the vehicle body 11 onto the lifting platform support arm mechanism block 9, the lateral and longitudinal positions of the vehicle body 11 are within the design range. The lifting stroke of the lifting platform 13 needs to be coordinated with the working height of the towing device 12 and the installation height of the plate chain 14, ensuring that when the lifting platform 13 is at its highest position, the support block 9 of the lifting platform support arm mechanism is at the correct vehicle receiving height, and when it is at its lowest position, the support block 9 of the lifting platform support arm mechanism is lower than the upper surface of the plate chain 14, allowing the plate chain 14 to pass smoothly over the lifting platform 13.

[0214] The lifting speed control of the lifting platform 13 needs to match the cycle requirements of the transfer process. While ensuring that the vehicle body 11 is placed stably, the lifting time of the lifting platform 13 should be shortened as much as possible to improve the production cycle efficiency.

[0215] The scissor lift platform is connected to a hydraulic control system. The hydraulic control system precisely controls the flow of oil into and out of the hydraulic cylinders to achieve smooth lifting and precise positioning of the lifting platform 13.

[0216] The hydraulic control system includes a hydraulic power unit, valve assembly, etc., which can be achieved using existing equipment and will not be described in detail here.

[0217] During the lifting phase of the lifting platform 13, the hydraulic cylinder is filled with oil at a stable flow rate, driving the scissor arms to unfold. After the lifting platform 13 rises smoothly to the designated height, the hydraulic system maintains the hydraulic cylinder pressure through the locking valve group, keeping the height of the lifting platform 13 stable and preventing the lifting platform 13 from sinking due to hydraulic leakage when carrying the vehicle body 11.

[0218] During the descent phase of the lifting platform 13, the hydraulic control system adopts a two-stage control strategy: first, it rapidly releases oil to make the lifting platform 13 descend quickly to near the target height, and then switches to slow oil release to make the lifting platform 13 descend slowly to the precise position, so as to place the vehicle body 11 smoothly onto the chain 14, avoiding impact collision between the vehicle body 11 and the chain 14 due to excessive descent speed.

[0219] The above two-stage control strategy improves work efficiency and avoids impact collisions between the vehicle body 11 and the chain 14, thus preventing collision damage to the vehicle body 11 and the chain 14.

[0220] The hydraulic control system also has safety protection functions, including overpressure protection, underpressure alarm, and liquid level monitoring, to ensure the safe and reliable operation of the hydraulic system under various working conditions.

[0221] The safety protection functions of the hydraulic control system can be achieved using existing technology, and will not be described in detail here.

[0222] The lifting device in this embodiment only improves the lifting platform support arm mechanism, adopting the lifting platform support arm mechanism described in Embodiment 1. The rest of the lifting device structure can use existing technology, and will not be described in detail here.

[0223] Example 3 This embodiment provides a vehicle body swapping system, such as Figures 5-7 As shown, the vehicle body swapping system is equipped with a lifting device as described in Embodiment 2.

[0224] The vehicle body transfer system is a complete equipment system for transferring the chassis line in the automobile final assembly workshop to the plate chain 14 process. It includes a lifting device 10, a transfer device 12, a lifting device, and a plate chain 14. The various parts work together to complete the transfer and handover process of the vehicle body 11 from the suspension conveyor line to the ground plate chain 14.

[0225] The existing equipment can be used for the lifting device 10, the transfer decorative paper, and the plate chain 14. The lifting device 10 is set above the transfer area to suspend and transport the vehicle body 11. The lifting device 10 runs along the suspension conveyor line to transport the vehicle body 11 to the transfer area and leaves after the transfer is completed.

[0226] The transfer device 12 is located within the transfer area and is used to lift the vehicle body 11 from the spreader 10 and transfer it downwards to the lifting device. The transfer device 12 has functions such as extending the support arm, lifting, and lowering for placement. The lifting device is located in the pit within the transfer area and includes a lifting platform 13 and a lifting platform support arm mechanism mounted on the lifting portion of the lifting platform 13. When the support arm of the lifting platform support arm mechanism is in the open state, it receives the vehicle body 11 from the transfer device 12. The lifting platform 13 then lowers to place the vehicle body 11 onto the plate chain 14. The plate chain 14, as a ground conveyor line, extends along the workshop floor below the lifting platform 13 to carry and transport the transferred vehicle body 11.

[0227] The vehicle body swapping system in this embodiment only uses the lifting device described in Embodiment 2. The rest of the structure of the vehicle body swapping system can be achieved using existing technology. Further technical details are not described in detail here.

[0228] The working process of the vehicle body transfer system is as follows: First, the spreader 10 carries the vehicle body 11 to be transferred along the suspension conveyor line to the transfer area. The locking device of the spreader 10 locks the spreader 10 in the transfer position to prevent longitudinal or lateral displacement during the transfer process, ensuring that the vehicle body 11 is in the accurate transfer alignment position. At the same time, the support arm 8 of the lifting platform support arm mechanism opens to the support position under the drive of the cylinder 1, and the lifting platform 13 rises from the low position to the designated height. The lifting platform support arm mechanism rises synchronously with the lifting platform 13 to the position ready to receive the vehicle body 11.

[0229] Subsequently, the boom of the transfer device 12 extends and rises, lifting the vehicle body 11 off the spreader 10 and detaching it from the suspension support of the spreader 10. The spreader boom opening device opens the spreader boom, providing space for the vehicle body 11 to be transferred downwards.

[0230] The transfer device 12 lowers the vehicle body 11, transferring it from the support arm of the transfer device 12 to the support block 9 of the lifting platform support arm mechanism. The vehicle body 11 then sits smoothly on the support blocks 9 on the two support arms 8 of the lifting platform support arm mechanism.

[0231] At this point, the lifting platform support arm mechanism bears the entire weight of the vehicle body 11, which is the condition under the greatest stress on the lifting platform support arm mechanism during the entire transfer process. Under the weight conditions of the new energy vehicle body 11, the connecting plate 6 in the lifting platform support arm mechanism rigidly connects the top ends of the two rotating shafts 7. The two rotating shafts 7 work together to bear the bending moment from the support arm. The rotating shafts 7 do not deform, the support arm maintains a stable supporting posture, and the vehicle body 11 is reliably lifted in the design position without lateral displacement or vertical sinking.

[0232] After the vehicle body 11 is transferred to the lifting platform support arm mechanism, the support arm of the transfer device 12 descends and retracts to its initial position, exiting the lifting state. The spreader arm opening device closes the spreader 10, the spreader locking device opens, and the spreader 10 leaves the transfer area and continues to run along the suspension conveyor line. At the same time, the lifting platform 13 carrying the vehicle body 11 begins to descend, first descending at a relatively fast speed to a height close to the chain 14, and then switching to a slow descent to smoothly place the vehicle body 11 onto the chain 14, avoiding impact collisions between the vehicle body 11 and the chain 14 due to excessive descent speed, and protecting the bottom components of the vehicle body 11 and the structure of the chain 14. After the vehicle body 11 is placed on the chain 14, the weight of the vehicle body 11 is transferred to the chain 14, the load on the lifting platform support arm mechanism is released, cylinder 1 drives the support arm 8 to retract, and the support arm swings inward from the bottom of the vehicle body 11 to the retracted position. The lifting platform 13 continues to descend to the initial low position, completing a complete transfer cycle, waiting for the arrival of the next vehicle body 11.

[0233] The descent speed of the lifting platform 13 can be set according to actual needs, and will not be described in detail here.

[0234] With the large-scale introduction of new energy vehicles, the increased weight of the vehicle body 11 significantly increases the load on the lifting platform support arm mechanism during the transfer process. If the rotating shaft 7 deforms due to insufficient load-bearing capacity, the movement trajectory of the support arm 8 will deviate from the design position. This may result in reduced transfer positioning accuracy and deviation in the placement position of the vehicle body 11, affecting the assembly accuracy of subsequent processes. In severe cases, it may lead to the breakage of the rotating shaft 7, loss of support arm, and the vehicle body 11 falling from the lifting platform support arm mechanism, causing serious equipment safety accidents and damage to the vehicle body 11, and even endangering the personal safety of on-site operators.

[0235] In this embodiment, the lifting platform support arm mechanism constrains the top ends of the two rotating shafts 7 through the connecting plate 6, which fundamentally solves the problem of insufficient load-bearing capacity of the rotating shafts 7. Without increasing the height of the rotating shafts 7 or affecting the normal swing of the support arm 8, the overall load-bearing capacity of the lifting platform support arm mechanism is improved to the level that meets the requirements of the new energy vehicle transfer process, ensuring the safe and stable operation of the vehicle body transfer system under the production conditions of new energy vehicles.

[0236] The lifting device is installed in the pit, and the lifting platform 13 rises and falls from the bottom of the pit. The lowest position of the lifting platform 13 makes the support block 9 of the lifting platform support arm mechanism lower than the upper surface of the plate chain 14, ensuring that the plate chain 14 can pass smoothly over the lifting platform 13 when the lifting platform 13 is at its lowest position. The highest position of the lifting platform 13 makes the support block 9 of the lifting platform support arm mechanism higher than the height of the vehicle body 11 when the towing device 12 is placed, ensuring that the vehicle body 11 can be accurately placed on the support block 9.

[0237] The running trajectory of the spreader 10 is aligned with the lifting trajectory of the lifting platform 13 on the plane projection, ensuring the horizontal alignment accuracy of the vehicle body 11 during the transfer process. The extension direction of the support arm of the transfer device 12 and the opening direction of the support arm 8 of the lifting platform support arm mechanism cooperate with each other, so that the vehicle body 11 maintains a horizontal posture and does not tilt during the transfer from the transfer device 12 to the lifting platform support arm mechanism.

[0238] In practical applications, the vehicle body transfer system of this embodiment requires precise synchronization between the open state of the lifting platform support arm mechanism and the working state of the transfer device 12.

[0239] The cylinder 1 of the lifting platform support arm mechanism and the action of the transfer device 12 are coordinated by the control system to ensure that the support arm of the lifting platform support arm mechanism is fully opened and in place when the transfer device 12 carries the vehicle body 11 down, and the support block 9 is in the correct receiving position; before the support arm 8 of the lifting platform support arm mechanism retracts, the support arm of the transfer device 12 has completely withdrawn from the lifting area to avoid motion interference between the two.

[0240] The connecting plate 6 of the lifting platform support arm mechanism in the lifting device is installed by a detachable fixed connection, which facilitates regular inspection of the fixing status of the connecting plate 6, ensures that the preload of the threaded fastener meets the requirements, and prevents the connecting plate 6 from loosening under long-term vibration and impact loads.

[0241] The wear condition of the limit block 3 needs to be checked regularly. When the wear of the limit block 3 exceeds the allowable range, it should be replaced in time to ensure the positioning accuracy of the support arm. The thrust bearing 16 and the radial bearing in the rotating assembly need to be lubricated regularly to ensure that the bearings maintain good lubrication during long-term operation, reduce frictional resistance, and extend the service life of the bearings.

[0242] The hydraulic control system of a scissor lift platform needs to be maintained regularly according to the equipment maintenance procedures, including changing the hydraulic oil, checking the seals, and cleaning the hydraulic filter, to ensure the stable and reliable operation of the hydraulic system.

[0243] Through systematic maintenance and management, the vehicle body transfer system can operate stably for a long time in the high-intensity production environment of the automobile assembly workshop, effectively reducing unplanned downtime and ensuring the continuous operating efficiency of the production line.

[0244] In the assembly line production mode of automobile final assembly workshop, the working time of each workstation is strictly controlled within the cycle time. Any unplanned downtime at any workstation will cause the entire production line to stop and wait, resulting in significant capacity loss. Deformation and cracking of the traditional lifting platform support arm mechanism due to insufficient load-bearing capacity of the rotating shaft 7 is one of the main causes of unplanned downtime at the transfer station. Each downtime repair time usually takes several hours, which seriously affects the operating efficiency of the production line.

[0245] In this embodiment, the lifting platform support arm mechanism rigidly constrains the top end of the rotating shaft 7 through the connecting plate 6, which fundamentally solves the problem of insufficient load-bearing capacity of the rotating shaft 7, significantly reduces the probability of deformation and cracking of the rotating shaft 7, thereby effectively reducing the unplanned downtime rate of the transfer station, ensuring the continuous and stable operation of the production line, and has important practical significance for improving the overall vehicle production efficiency and reducing manufacturing costs.

[0246] In this embodiment, the support block 9 of the lifting platform arm mechanism in the vehicle body transfer system adopts a replaceable design. By replacing different specifications of support blocks 9, it can adapt to the differences in the shape and position of the bottom support points of different vehicle models 11. The load-bearing capacity of the lifting platform arm mechanism covers the full weight range from traditional fuel vehicles to new energy vehicles, without the need for structural adjustments to the lifting platform arm mechanism based on changes in vehicle weight. The stroke and pressure of cylinder 1 can be adjusted through a hydraulic control system to adapt to the different requirements of different vehicle models for the swing speed and driving force of the support arm 8. This allows the vehicle body transfer system to adapt to the needs of production line vehicle switching without large-scale modifications, reducing the adjustment time and cost of vehicle switching.

[0247] In this embodiment, the lifting platform support arm mechanism in the vehicle body transfer system effectively reduces the stress level of the rotating shaft 7 through the top constraint of the connecting plate 6. Consequently, the stress on each bearing in the rotating assembly is reduced, the friction torque of the bearing is reduced, the driving force of the cylinder 1 required for the support arm 8 to swing is reduced, and the working pressure and air consumption of the cylinder 1 are reduced accordingly.

[0248] In the large-scale production environment of automobile assembly workshops, each production line is usually equipped with multiple sets of transfer systems. The reduction of air consumption of cylinder 1 in each transfer system will translate into significant compressed air savings on the scale of the entire production line, which will help reduce the energy consumption and operating costs of the production line and significantly improve economic efficiency.

[0249] Meanwhile, the reduction in deformation of the rotating shaft 7 helps extend the service life of the rotating components, reduce the frequency of bearing replacement, thereby reducing the maintenance cost of the entire vehicle body towing system, reducing spare parts consumption and waste generation, which is in line with the development concept of green manufacturing.

[0250] Compared with traditional vehicle swapping systems, the vehicle swapping system of this embodiment has the following advantages: In terms of structural load-bearing capacity, by adding a detachable and fixed connecting plate 6 between the top ends of the two rotating shafts 7, the two rotating shafts 7, which were originally independently bearing loads, are rigidly constrained at the top ends. This fundamentally changes the force-bearing mode of a single rotating shaft 7, transforming the cantilever beam-type single-point force-bearing into a frame-type force-bearing with dual-axis cooperation. The bending stress borne by a single rotating shaft 7 is greatly reduced, and the overall load-bearing capacity is significantly improved. This can meet the load-bearing requirements of the transfer process after the weight of the new energy vehicle body 11 increases, and completely solves the equipment safety accident hazards caused by overload deformation or cracking of the rotating shaft 7.

[0251] In terms of equipment safety, the improved load-bearing capacity of the rotating shaft 7 eliminates the root cause of deformation and cracking of the rotating shaft 7, ensures the stability of the movement trajectory of the support arm 8, and prevents the vehicle body 11 from falling due to the failure of the rotating shaft 7 during the transfer process. This effectively protects the product quality of the vehicle body 11 and the personal safety of on-site operators, and significantly improves the operational safety level of the vehicle body 11 transfer process.

[0252] Regarding equipment height control, by optimizing the structural design of the rotating shaft 7, the axial length of the rotating shaft 7 is reduced by approximately 40mm while adding the connecting plate 6. The safety gap between the top of the rotating shaft 7 and the components of the bottom plate 4 of the vehicle body 11 is increased, eliminating the risk of accidental interference between the bottom components of the vehicle body 11 and the top of the rotating shaft 7 during the vehicle body 11 rotation process, and effectively protecting the integrity of the bottom components of the vehicle body 11.

[0253] In terms of equipment maintainability, the detachable fixed connection design of the connecting plate 6 makes daily maintenance operations more convenient. The individual disassembly and replacement of the connecting plate 6 does not require disassembly of the rotating shaft 7 and the support arm, resulting in short maintenance downtime and improving the operating efficiency and equipment utilization of the production line.

[0254] In terms of economic efficiency, the technical solution of this embodiment can be used as an upgrade and modification scheme for the existing lifting platform 13 support arm device. It only requires processing of the rotating shaft 7, shortening the axial length of the rotating shaft 7 and processing the connecting shaft at the end of the rotating shaft 7. A connecting plate 6 is set on the top of the rotating shaft 7 and fixed by the pressure plate 15. The upgrade can be completed with only simple machining processes, which significantly reduces the material cost, processing cost and labor cost of equipment modification. The overall modification investment cost is low and the cost-effectiveness advantage is outstanding. It is suitable for the reliability upgrade of the existing lifting platform support arm device, effectively improves the load-bearing capacity of the equipment, improves the stability of the equipment, and has broad engineering promotion value. It provides an economical and effective solution for automobile assembly workshops to cope with the load-bearing challenges brought about by the introduction of new energy vehicles.

[0255] In terms of ensuring production cycle time, the significant improvement in the reliability of the lifting platform support mechanism effectively reduces the unplanned downtime rate of the transfer station, ensuring the continuous and stable operation of the production line, which has important practical value for improving the overall vehicle production efficiency and reducing manufacturing costs.

[0256] The combined technical effects of the above aspects demonstrate the systematic innovative value of the technical solution in this embodiment in addressing the challenges of the transfer process for new energy vehicles, and provide reliable technical support for the intelligent, efficient, and safe development of automobile assembly workshops.

[0257] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A lifting platform support arm mechanism, characterized in that, It includes two rotating shafts, the bottom ends of which are fixedly connected to a base plate and the axial direction of the rotating shafts is perpendicular to the base plate. One end of each rotating shaft is rotatably connected to a support arm so that the support arm can swing. The other end of the support arm is used to support the vehicle body. The support arm is connected to a swing drive connected to a mounting base. The swing drive can drive the support arm to swing. The mounting base is fixed to the base plate. A connecting plate is provided between the top ends of the two rotating shafts. The connecting plate is detachably fixed to the top ends of the rotating shafts through a fixing component.

2. The lifting platform support arm mechanism as described in claim 1, characterized in that, The device includes a rotating shaft body, a connecting shaft coaxially provided on the top surface of the rotating shaft body, the diameter of the connecting shaft being smaller than the diameter of the rotating shaft body, a connecting hole matching the connecting shaft at the end of the connecting plate, the connecting shaft extending into the connecting hole, a fixing component using a pressure plate, the pressure plate being set on the upper surface of the connecting plate, the pressure plate being detachably connected to the connecting shaft, the pressure plate pressing the end of the connecting plate onto the stepped surface formed between the rotating shaft body and the connecting shaft.

3. The lifting platform support arm mechanism as described in claim 2, characterized in that, The top surface of the connecting shaft is provided with a threaded hole, and the pressure plate is provided with a fixing hole that matches the threaded hole. A threaded fastener passes through the fixing hole and is threadedly fixed to the connecting shaft through the threaded hole to fix the pressure plate and the connecting shaft in a fixed connection.

4. A lifting platform support arm mechanism as described in claim 2, characterized in that, The axial length of the connecting shaft is equal to the axial length of the connecting hole.

5. A lifting platform support arm mechanism as described in claim 1, characterized in that, The swing drive component is a linear telescopic component. The fixed end of the linear telescopic component is hinged to the mounting base, and its telescopic part is hinged to the drive arm fixedly installed on the outer side of the support arm.

6. A lifting platform support arm mechanism as described in claim 5, characterized in that, The drive arm is located at the rotatable connection end between the support arm and the rotating shaft.

7. A lifting platform support arm mechanism as described in claim 1, characterized in that, The axial length of the rotating shaft is 115mm-120mm, preferably 116mm.

8. A lifting platform support arm mechanism as described in claim 1, characterized in that, The base plate is provided with a limiting component, which can contact the support arm to limit the rotation of the support arm.

9. A lifting platform support arm mechanism as described in claim 8, characterized in that, The limiting component includes a limiting block, which is fixedly connected to a limiting block bracket, which is fixed to the base plate.

10. A lifting platform support arm mechanism as described in claim 1, characterized in that, One end of the support arm is rotatably connected to the rotating shaft, and the top surface of the other end is provided with a support block. The support arm applies a supporting force to the vehicle body through the support block.

11. A lifting platform support arm mechanism as described in claim 10, characterized in that, The end of the support arm is provided with a support plate, and baffles are provided on both sides of the support plate. The support block is placed in the space between the two baffles and is fixedly connected to the support plate.

12. A lifting platform support arm mechanism as described in claim 1, characterized in that, The support arm includes an arm body, one end of which is provided with a rotating connecting seat. The rotating connecting seat has a channel, through which a rotating shaft passes and is rotatably connected to the rotating connecting seat via a rotating assembly.

13. A lifting platform support arm mechanism as described in claim 12, characterized in that, The rotating assembly includes a thrust bearing and at least one radial bearing arranged sequentially from the bottom. A spacer ring is provided between the thrust bearing and the bottommost radial bearing. The spacer ring is sleeved on the outer circumference of the rotating shaft. A bushing is provided between adjacent radial bearings. The bushing is sleeved on the outer circumference of the rotating shaft.

14. A lifting platform support arm mechanism as described in claim 1, characterized in that, The base plate is a T-shaped plate, including a first base plate part and a second base plate part integrally set in the middle of the first base plate part. One end of the second base plate part is integrally connected to the middle of the first base plate part, and the top surface of the other end is provided with a mounting seat. The top surfaces of the two ends of the first base plate part are fixedly connected to the bottom surface of the rotating shaft.

15. A lifting platform support arm mechanism as described in claim 14, characterized in that, The two rotation axes are symmetrically arranged with respect to the center of the first base plate.

16. A lifting device, comprising a lifting platform, characterized in that, The lifting section of the lifting platform is provided with a lifting platform support arm mechanism as described in any one of claims 1-15.

17. The lifting device as claimed in claim 16, characterized in that, The lifting platform is a scissor-type hydraulic lifting platform.

18. A vehicle body swapping system, characterized in that, The device is provided with the lifting device as described in claim 16.

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