Motorcycle frame zero-gap assembly welding workstation and process based on visual positioning

Abstract

The present application relates to the technical field of welding, in particular to a motorcycle frame zero-gap assembly welding workstation and process based on visual positioning, comprising a base and a transport mechanism movably arranged on the base and used for carrying a welding robot, wherein the base is internally provided with a slide rail and a toothed plate, and the welding robot is provided with a visual positioning system, wherein the U-shaped ground rail and the toothed plate are arranged to enable a single welding robot to move along the rail between different welding stations, so that a single robot can complete the welding operation that originally requires multiple fixed robots or multiple positioners, thereby reducing the number of welding robots and the configuration of auxiliary equipment such as positioners.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and more specifically, to a vision-based zero-gap assembly and welding workstation and process for motorcycle frames. Background Technology

[0002] In the motorcycle manufacturing industry, the frame, as the core structural component that supports the engine, suspension system, and body panels, directly determines the safety and handling of the entire vehicle through its welding quality. The motorcycle frame consists of multiple tubular and stamped parts, with weld seams distributed over a wide area, requiring welding operations on multiple sides of the frame.

[0003] Patent application CN202511206274.0 discloses an integrated intelligent welding equipment for multi-station marine pipelines, solving the problems of existing equipment being only suitable for straight pipes and elbows with low welding accuracy and poor compatibility. The equipment includes a processing table, a welding robotic arm with six or more axes, and two sets of placement structures that mesh with a rotating structure. By combining existing technologies and integrating intelligent equipment such as vision positioning and PLC control, it is suitable for welding straight pipes and multi-angle elbows, achieving a port coaxiality of ≤0.1mm and increasing welding efficiency by 35%.

[0004] Currently, motorcycle frame welding production mainly utilizes fixed welding robot workstations. To meet the demand for multi-sided welding of the frame, two or more welding robots are configured at the welding station to weld the frame simultaneously from different sides. Secondly, positioners or rotary tables are used to clamp and rotate the frame, allowing a single welding robot to sequentially complete welding from different angles. However, the configuration of multiple welding robots in the above scheme results in high equipment investment costs and a large footprint. The positioner and its associated rotary clamping device have complex structures, which not only increase equipment costs but also place higher demands on the clamping accuracy and rigidity of the frame.

[0005] In view of this, this application proposes a zero-gap assembly and welding workstation and process for motorcycle frames based on visual positioning. Summary of the Invention

[0006] The purpose of this invention is to provide a zero-gap assembly and welding workstation and process for motorcycle frames based on vision positioning. By setting up a U-shaped ground rail and toothed plate, a single welding robot can move along the rail between different welding stations to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A vision-based zero-gap assembly and welding workstation for motorcycle frames includes a base and a transport mechanism that is movably mounted on the base and used to carry a welding robot. The base is equipped with a slide rail and a toothed plate, and the welding robot is equipped with a vision positioning system. The transport mechanism includes a movable part slidably disposed on a base, a motor mounted on the movable part, a gear and an eccentric wheel coaxially connected to the output shaft of the motor, and a liquid supply part and a locking part disposed on the movable part. The liquid supply part is provided with a piston component that cooperates with the eccentric wheel. The locking part includes a pair of locking blocks driven by a cylinder and a spray head embedded in the groove on the bottom surface of the locking blocks and connected to the liquid supply part through a liquid supply channel. The motor drives the gear to mesh with the toothed plate to adjust the welding station position of the welding robot. At the same time, the motor drives the piston to reciprocate through the eccentric wheel to supply lubricant to the spray head to lubricate the slide rail. When the transport mechanism reaches the preset welding station position, the cylinder drives the pair of locking blocks to move downward to abut against the slide rail to lock the transport mechanism. At the same time, the liquid supply channel of the spray head is cut off to stop the supply of lubricant.

[0008] In the technical solution of the present invention, the movable part includes a base plate, a pair of pulley assemblies rotatably connected to the bottom of the base plate, and a support frame fixedly connected to the top surface of the base plate by bolts. The top surface of the base plate is provided with two square grooves for accommodating the locking part, and the bottom surface of the support frame is provided with two circular holes. The support frame and the hole walls of the circular holes are provided with through holes that communicate with the outer wall.

[0009] In the technical solution of the present invention, the liquid supply unit includes a liquid storage box fixedly connected to the top surface of the base plate by bolts, an air pipe and a liquid supply pipe communicating with the inside of the liquid storage box, the end of the air pipe communicating with the piston component, and the end of the liquid supply pipe communicating with the liquid supply channel of the locking part.

[0010] In the technical solution of the present invention, the piston component includes a square box that is snapped onto the bottom surface of the base plate, a piston plate that slides within the square box, a slide rod that is snapped onto the outer wall of the piston plate, a crossbar that is welded to the end of the slide rod and abuts against the eccentric wheel, and a first spring that is sleeved on the outside of the slide rod. A partition is snapped onto the inner wall of the square box, and a one-way air inlet valve and a one-way air outlet valve are provided on the outer wall of the end of the square box. The one-way air outlet valve is connected to the liquid storage box through an air pipe. The two ends of the first spring abut against the square box and the partition respectively, and the elastic force of the first spring is used to push the crossbar to move in the direction of the eccentric wheel.

[0011] In the technical solution of the present invention, the locking part further includes a sliding plate driven by a cylinder and sliding on the bottom surface inside the support frame, a lifting tube slidably sleeved in the round hole and with a hemispherical top, and a second spring sleeved on the outside of the lifting tube. The bottom surface of the sliding plate is provided with two guide grooves, and the top of the lifting tube slides in cooperation with the guide grooves.

[0012] In the technical solution of the present invention, the bottom end of the lifting tube is rotatably connected to the locking block, and an inlet hole is provided through the side wall of the lifting tube. The bottom end of the second spring abuts against the bottom wall of the square groove, and the top end abuts against the annular baffle on the outer wall of the lifting tube, for driving the lifting tube to reset.

[0013] In the technical solution of the present invention, when the lifting tube is in the rising position, the liquid inlet hole and the through hole are connected and the liquid supply channel is open; when the cylinder drives the lifting tube to descend, the liquid inlet hole and the through hole are misaligned and the liquid supply channel is cut off.

[0014] In the technical solution of the present invention, the base further includes a U-shaped ground rail, the slide rail consists of two parallel guide rails arranged on the ground rail, and the toothed plate is fixedly connected to the top surface of the ground rail by bolts.

[0015] In the technical solution of the present invention, the welding robot moves synchronously with the transport mechanism, and the vision positioning system is configured at the end of the welding robot actuator to identify the weld position on the frame clamping table and guide the welding robot to accurately position the welding trajectory.

[0016] On the other hand, the present invention also provides a zero-gap assembly and welding process for motorcycle frames based on visual positioning, including the following steps: S1. Assemble and position the various components of the motorcycle frame with zero clearance using tooling fixtures, and then fix them by spot welding; S2. Drive the transport mechanism to move along the base to the welding station. During the movement, the eccentric wheel cooperates with the piston of the liquid supply unit to lubricate the slide rail on the base through the spray head. S3. After the transport mechanism moves to the welding station, the cylinder of the locking part drives a pair of locking blocks to move downward to abut against the slide rail, thereby locking the transport mechanism and fixing it to the base. At the same time, the liquid supply channel of the spray head is cut off to stop the supply of lubricating fluid. S4. The visual positioning system identifies the weld position on the frame clamping platform and guides the welding robot to perform precise welding on the spot-welded frame.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. This vision-based zero-gap assembly and welding workstation and process for motorcycle frames, by setting up a U-shaped ground rail and toothed plate, allows a single welding robot to move along the rail between different welding stations. One robot can complete the welding operations that originally required multiple fixed robots or multiple positioner stations, reducing the number of welding robots and the configuration of auxiliary equipment such as positioners.

[0018] 2. This vision-based zero-gap assembly and welding workstation and process for motorcycle frames uses a motor to simultaneously drive gears and eccentric wheels, enabling the walking drive of the transport mechanism and the lubrication drive of the fluid supply unit to be completed synchronously by the same power source, simplifying the power system structure and reducing equipment costs.

[0019] 3. This vision-based zero-gap assembly and welding workstation and process for motorcycle frames utilizes a lifting tube driven by the same set of cylinders to descend, simultaneously locking the transport mechanism with locking blocks and interfering with the flow of fluid through the inlet and through holes. This allows the transport mechanism to automatically lock and stop oiling upon reaching the welding station, preventing welding accuracy from being affected by the displacement of the transport mechanism during welding. It also avoids continuous spraying of lubricant at the welding station, which would cause contamination of the slide rail and waste of lubricant.

[0020] 4. This vision-based zero-gap assembly and welding workstation and process for motorcycle frames uses a vision positioning system on the welding robot to identify the weld position on the frame clamping table, guiding the welding robot to perform precise welding on the spot-welded frame, thus realizing automated and precise frame welding operations. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the base structure in this invention; Figure 3 This is one of the structural schematic diagrams of the transportation mechanism in this invention; Figure 4 This is the second schematic diagram of the transportation mechanism in this invention; Figure 5 This is a cross-sectional schematic diagram of the transportation mechanism in this invention; Figure 6 This is a schematic diagram of the structure of the moving part in this invention; Figure 7 For the present invention Figure 6 An enlarged schematic diagram of part A in the middle; Figure 8 This is a schematic diagram of the structure of the base plate in this invention; Figure 9 This is a partial structural diagram of the transportation mechanism in this invention; Figure 10 This is a schematic diagram of the liquid supply section in this invention; Figure 11 This is a cross-sectional schematic diagram of the piston component in this invention; Figure 12 This is a cross-sectional schematic diagram of the locking part in this invention; Figure 13 This is one of the partial structural diagrams of the locking part in this invention; Figure 14 This is a second schematic diagram of a portion of the locking part in this invention; Explanation of reference numerals in the attached figures: 100. Base; 110. Ground rail; 120. Slide rail; 130. Toothed plate; 200. Transport mechanism; 210. Moving part; 211. Base plate; 2110. Square channel; 212. Pulley assembly; 213. Support frame; 220. Motor; 230. Gear; 240. Eccentric wheel; 250. Liquid supply part; 251. Square box; 2510. Partition plate; 252. Piston plate; 253. Slide rod; 254. Crossbar; 255. First spring; 256. Air pipe; 257. Liquid storage box; 258. Liquid supply pipe; 260. Locking part; 261. Cylinder; 262. Slide plate; 2620. Guide groove; 263. Lifting pipe; 2630. Liquid inlet; 264. Locking block; 265. Second spring; 266. Spray head; 300. Welding robot. Detailed Implementation

[0022] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0023] Please see Figures 1-2 As shown, this embodiment provides the following technical solution: A vision-based zero-gap motorcycle frame assembly and welding workstation includes a base 100 and a transport mechanism 200 movably mounted on the base 100 to support a welding robot 300. The base 100 provides movement support and guidance for the transport mechanism 200. The base 100 includes a U-shaped ground rail 110, a slide rail 120, and a toothed plate 130. The slide rail 120 consists of two parallel guide rails arranged on the ground rail 110. The toothed plate 130 is bolted to the top surface of the ground rail 110. The transport mechanism 200 moves the welding robot 300 along the base 100 between different welding stations. The welding robot 300 is equipped with a vision positioning system and moves synchronously with the transport mechanism 200. The vision positioning system is located at the end of the welding robot 300's actuator to identify the weld position on the frame clamping table and guide the welding robot 300 to accurately position the welding trajectory.

[0024] Please see Figures 3-9 As shown, in this embodiment, the transport mechanism 200 includes a movable part 210 slidably disposed on the base 100, a motor 220 mounted on the movable part 210, a gear 230 and an eccentric wheel 240 coaxially connected to the output shaft of the motor 220, and a liquid supply part 250 and a locking part 260 disposed on the movable part 210.

[0025] Furthermore, the moving part 210 includes a base plate 211, a pair of pulley assemblies 212 rotatably connected to the bottom of the base plate 211, and a support frame 213 fixedly connected to the top surface of the base plate 211 by bolts. The top surface of the base plate 211 has two square grooves 2110 for accommodating the locking part 260, and the bottom surface of the support frame 213 has two through holes 2310. The walls of the support frame 213 and the holes 2310 have through holes 2311 that communicate with the outer wall. The motor 220 is fixedly connected to the top surface of the base plate 211 by bolts. The output shaft of the motor 220 extends to the bottom of the base plate 211. The gear 230 meshes with the gear plate 130. The motor 220 drives the gear 230 to mesh with the gear plate 130 to adjust the welding position of the welding robot 300.

[0026] In the above configuration, the moving part 210 integrates the overall load-bearing, sliding guide, and installation support of the welding robot 300 into one unit, ensuring the smooth movement of the transport mechanism 200 along the base 100 and the stability of the welding robot 300 during operation. The motor 220 simultaneously drives the gear 230 and the eccentric wheel 240, so that the walking drive of the transport mechanism 200 and the lubrication drive of the liquid supply part 250 are completed synchronously by the same power source, eliminating the need for an additional independent lubrication drive device and simplifying the power system structure.

[0027] Please see Figures 10-11 As shown, in this embodiment, the liquid supply unit 250 includes a piston component that cooperates with the eccentric wheel 240, a liquid storage box 257 that is fixedly connected to the top surface of the base plate 211 by bolts, an air pipe 256 and a liquid supply pipe 258 that communicate with the interior of the liquid storage box 257. The end of the air pipe 256 is connected to the piston component, and the end of the liquid supply pipe 258 is connected to the liquid supply channel of the locking part 260. The piston component includes a square box 251 that is snapped onto the bottom surface of the base plate 211, a piston plate 252 that slides within the square box 251, a slide rod 253 that is snapped onto the outer wall of the piston plate 252, a crossbar 254 that is welded to the end of the slide rod 253 and abuts against the eccentric wheel 240, and a first spring 255 that is sleeved on the outside of the slide rod 253.

[0028] Furthermore, a partition 2510 is snapped onto the inner wall of the square box 251. A one-way air inlet valve and a one-way air outlet valve are provided on the outer wall of the end of the square box 251. The one-way air outlet valve is connected to the liquid storage box 257 via an air pipe 256. The two ends of the first spring 255 abut against the square box 251 and the partition 2510 respectively. The elastic force of the first spring 255 is used to push the crossbar 254 towards the eccentric wheel 240. The one-way air inlet valve of the square box 251 is used to draw in external air when the piston plate 252 reciprocates. The one-way air outlet valve is connected to the liquid storage box 257 via an air pipe 256 to deliver compressed air into the liquid storage box 257 to pressurize it.

[0029] In the above configuration, the rotational motion of the motor 220 is converted into the reciprocating linear motion of the piston plate 252 through the contact engagement between the eccentric wheel 240 and the crossbar 254. With the guidance of the one-way air inlet valve and the one-way air outlet valve, continuous pressurization of the liquid storage box 257 is achieved, so that the lubricating fluid is continuously and stably supplied during the movement of the transport mechanism 200. The first spring 255 ensures that the crossbar 254 always maintains close contact with the outer peripheral wall of the eccentric wheel 240, ensuring the reliability of the piston movement and the continuity of the fluid supply. At the same time, it realizes the automatic reset of the piston when the eccentric wheel 240 is not working.

[0030] Please see Figures 12-14 As shown, in this embodiment, the locking part 260 also includes a sliding plate 262 driven by a cylinder 261 and sliding on the bottom surface inside the support frame 213, a lifting tube 263 slidably sleeved in the round hole 2310 and with a hemispherical top, a pair of locking blocks 264, a spray head 266 embedded in the groove on the bottom surface of the locking block 264 and connected to the liquid supply part 250 through the liquid supply channel, and a second spring 265 sleeved on the outside of the lifting tube 263.

[0031] Furthermore, the bottom surface of the slide plate 262 is provided with two guide grooves 2620, and the top end of the lifting tube 263 is slidably engaged with the guide grooves 2620. The bottom end of the lifting tube 263 is rotatably connected to the locking block 264, and a liquid inlet hole 2630 is provided through the side wall of the lifting tube 263. The bottom end of the second spring 265 abuts against the bottom wall of the square groove 2110, and the top end abuts against the annular baffle on the outer wall of the lifting tube 263, for driving the lifting tube 263 to reset. When the lifting tube 263 is in the rising position, the liquid inlet hole 2630 is connected to the through hole 2311, and the liquid supply channel is open; when the cylinder 261 drives the lifting tube 263 to descend, the liquid inlet hole 2630 is misaligned with the through hole 2311, and the liquid supply channel is cut off.

[0032] Lubrication and locking linkage principle: When the transport mechanism 200 moves along the ground rail 110, the motor 220 drives the gear 230 to mesh with the toothed plate 130 to adjust the welding station position of the welding robot 300. At the same time, the eccentric wheel 240 drives the piston to reciprocate to supply lubricating fluid to the spray head 266 to lubricate the slide rail 120. During the reciprocating movement of the piston plate 252, the one-way air inlet valve draws in external air, and the one-way air outlet valve sends compressed air through the air pipe 256 into the liquid storage box 257 for pressurization. The lubricating fluid in the liquid storage box 257 is then pressurized through the liquid supply pipe 258 to the through hole 2311 and the liquid inlet hole. 2630, Lubricating fluid is sprayed from the spray head 266 onto the slide rail 120; when the transport mechanism 200 reaches the preset welding station position, the cylinder 261 is activated, and the cylinder 261 drives a pair of locking blocks 264 to move downward to abut against the slide rail 120 to lock the transport mechanism 200. At the same time, the fluid supply channel of the spray head 266 is cut off to stop the supply of lubricating fluid. After welding is completed, the cylinder 261 drives the slide plate 262 to rise in the opposite direction, the second spring 265 pushes the lifting tube 263 to reset, the locking block 264 disengages from the ground rail 110, and the fluid inlet hole 2630 reconnects with the through hole 2311.

[0033] In the above configuration, the slide plate 262 is driven to descend by the cylinder 261. The slide plate 262 slides through the guide groove 2620 and the top of the lifting tube 263, transmitting the linear motion of the cylinder 261 to the lifting tube 263 through the guide groove 2620. This causes the locking block 264 to descend synchronously with the lifting tube 263 and abut against the slide rail 120, thereby locking and fixing the transport mechanism 200. At the same time, the descent of the lifting tube 263 causes the liquid inlet hole 2630 to misalign with the through hole 2311, cutting off the liquid supply channel. This allows the descent action of the same set of cylinders 261 to simultaneously achieve both locking and stopping the oil supply, eliminating the need for additional valves or control components and simplifying the control logic. When the cylinder 261 is depressurized, the second spring 265 drives the lifting tube 263 to automatically reset, restoring the connection of the liquid supply channel and the travel capability of the transport mechanism 200, ensuring the reliability of continuous operation.

[0034] The vision-based zero-gap motorcycle frame assembly and welding workstation and process of the present invention are used as follows: S1. Assemble and position the various components of the motorcycle frame with zero clearance using tooling fixtures, and then fix them by spot welding; S2. Start motor 220. Motor 220 drives gear 230 to mesh with toothed plate 130, driving transport mechanism 200 to move along base 100 to welding station. During the movement, eccentric wheel 240 rotates synchronously with motor 220 and reciprocates to push piston of liquid supply part 250, pressurizing lubricant through liquid supply channel to spray head 266. Spray head 266 continuously sprays lubricant onto slide rail 120 during the movement of transport mechanism 200 to dynamically lubricate slide rail 120, reduce frictional resistance between pulley assembly 212 and slide rail 120, and ensure the smoothness and positioning accuracy of transport mechanism 200 movement. S3. After the transport mechanism 200 moves to the welding station, the cylinder 261 of the locking part 260 drives the slide plate 262 to descend. The slide plate 262 pushes the lifting pipe 263 to descend against the elastic force of the second spring 265 through the guide groove 2620. The lifting pipe 263 drives a pair of locking blocks 264 to move downward to abut against the slide rail 120, locking the transport mechanism 200 to the base 100. At the same time, the descent of the lifting pipe 263 causes the liquid inlet hole 2630 to be misaligned with the through hole 2311, the liquid supply channel is cut off, and the spray head 266 stops the supply of lubricating fluid. This avoids the displacement of the transport mechanism 200 due to vibration during the welding process, which would affect the welding accuracy. It also avoids the continuous spraying of lubricating fluid at the welding station, which would cause contamination of the slide rail 120 and waste of lubricating fluid. S4. The visual positioning system identifies the weld position on the frame clamping table and guides the welding robot 300 to perform precise welding on the spot-welded frame. During the welding process, the visual positioning system provides real-time feedback on weld deviations, and the welding robot 300 dynamically adjusts the welding trajectory based on the feedback signal to ensure consistent weld formation quality. S5. After welding is completed, cylinder 261 drives slide plate 262 to rise in the reverse direction, second spring 265 pushes lifting tube 263 to reset, locking block 264 disengages from slide rail 120, and transport mechanism 200 resumes walking state; at the same time, lifting tube 263 rises to reconnect liquid inlet hole 2630 with through hole 2311, liquid supply channel is restored to conduction, in preparation for the next movement lubrication. S6. Repeat steps S2 to S5 to complete the frame assembly and welding operations at each welding station in sequence, thereby realizing continuous automated assembly and welding production of motorcycle frames.

[0035] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the specification and its equivalents.

Claims

1. A vision-based zero-gap assembly and welding workstation for motorcycle frames, comprising a base and a transport mechanism movably mounted on the base for carrying a welding robot, wherein the base is provided with a slide rail and a toothed plate, and the welding robot is provided with a vision positioning system, characterized in that: The transport mechanism includes a movable part slidably disposed on a base, a motor mounted on the movable part, a gear and an eccentric wheel coaxially connected to the output shaft of the motor, and a liquid supply part and a locking part disposed on the movable part. The liquid supply part is provided with a piston component that cooperates with the eccentric wheel. The locking part includes a pair of locking blocks driven by a cylinder and a spray head embedded in the groove on the bottom surface of the locking blocks and connected to the liquid supply part through a liquid supply channel. The motor drives the gear to mesh with the toothed plate to adjust the welding station position of the welding robot. At the same time, the motor drives the piston to reciprocate through the eccentric wheel to supply lubricant to the spray head to lubricate the slide rail. When the transport mechanism reaches the preset welding station position, the cylinder drives the pair of locking blocks to move downward to abut against the slide rail to lock the transport mechanism. At the same time, the liquid supply channel of the spray head is cut off to stop the supply of lubricant.

2. The vision-based zero-gap assembly and welding workstation for motorcycle frames according to claim 1, characterized in that: The movable part includes a base plate, a pair of pulley assemblies rotatably connected to the bottom of the base plate, and a support frame fixed to the top surface of the base plate by bolts. The top surface of the base plate has two square grooves for accommodating the locking part, and the bottom surface of the support frame has two circular holes. The support frame and the walls of the circular holes have through holes that communicate with the outer walls.

3. The vision-based zero-gap assembly and welding workstation for motorcycle frames according to claim 2, characterized in that: The liquid supply unit includes a liquid storage box fixed to the top surface of the base plate by bolts, an air pipe and a liquid supply pipe communicating with the inside of the liquid storage box, the end of the air pipe communicating with the piston, and the end of the liquid supply pipe communicating with the liquid supply channel of the locking part.

4. The vision-based zero-gap assembly and welding workstation for motorcycle frames according to claim 3, characterized in that: The piston assembly includes a square box snapped onto the bottom surface of the base plate, a piston plate sliding within the square box, a slide rod snapped onto the outer wall of the piston plate, a crossbar welded to the end of the slide rod and abutting against the eccentric wheel, and a first spring sleeved on the outside of the slide rod. A partition is snapped onto the inner wall of the square box, and a one-way air inlet valve and a one-way air outlet valve are provided on the outer wall of the end of the square box. The one-way air outlet valve is connected to the liquid storage box through an air pipe. The two ends of the first spring abut against the square box and the partition, respectively, and the elastic force of the first spring is used to push the crossbar to move towards the eccentric wheel.

5. The vision-based zero-gap assembly and welding workstation for motorcycle frames according to claim 4, characterized in that: The locking part also includes a sliding plate driven by a cylinder and sliding on the bottom surface inside the support frame, a lifting tube that is slidably sleeved in the round hole and has a hemispherical top, and a second spring sleeved on the outside of the lifting tube. The bottom surface of the sliding plate has two guide grooves, and the top of the lifting tube slides in cooperation with the guide grooves.

6. The vision-based zero-gap assembly and welding workstation for motorcycle frames according to claim 5, characterized in that: The bottom end of the lifting tube is rotatably connected to the locking block. An inlet hole is provided through the side wall of the lifting tube. The bottom end of the second spring abuts against the bottom wall of the square groove, and the top end abuts against the annular baffle on the outer wall of the lifting tube, which is used to drive the lifting tube to reset.

7. The vision-based zero-gap assembly and welding workstation for motorcycle frames according to claim 6, characterized in that: When the lifting tube is in the rising position, the liquid inlet and the through hole are connected, and the liquid supply channel is open; when the cylinder drives the lifting tube to descend, the liquid inlet and the through hole are misaligned, and the liquid supply channel is cut off.

8. The vision-based zero-gap assembly and welding workstation for motorcycle frames according to claim 7, characterized in that: The base also includes a U-shaped ground rail, the slide rail consists of two parallel guide rails arranged on the ground rail, and the toothed plate is fixedly connected to the top surface of the ground rail by bolts.

9. The vision-based zero-gap assembly and welding workstation for motorcycle frames according to claim 8, characterized in that: The welding robot moves synchronously with the transport mechanism. The vision positioning system is configured at the end of the welding robot actuator to identify the weld position on the frame clamping table and guide the welding robot to accurately position the welding trajectory.

10. A vision-based zero-gap assembly and welding process for motorcycle frames, using the vision-based zero-gap assembly and welding workstation for motorcycle frames as described in claim 9, characterized in that, Includes the following steps: S1. Assemble and position the various components of the motorcycle frame with zero clearance using tooling fixtures, and then fix them by spot welding; S2. Drive the transport mechanism to move along the base to the welding station. During the movement, the eccentric wheel cooperates with the piston of the liquid supply unit to lubricate the slide rail on the base through the spray head. S3. After the transport mechanism moves to the welding station, the cylinder of the locking part drives a pair of locking blocks to move downward to abut against the slide rail, thereby locking the transport mechanism and fixing it to the base. At the same time, the liquid supply channel of the spray head is cut off to stop the supply of lubricating fluid. S4. The visual positioning system identifies the weld position on the frame clamping platform and guides the welding robot to perform precise welding on the spot-welded frame.

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