Hub steel ring girth welding device

Abstract

The invention discloses a hub steel ring girth welding device, and relates to the technical field of automobile manufacturing, the hub steel ring girth welding device has the advantages of stably conducting a welding loop and keeping a clamping surface clean continuously, and the hub steel ring girth welding device is characterized by comprising a support, a hub steel ring, a welding robot arranged on the support and a clamp assembly; the clamp assembly comprises a lower disc body and an upper disc body which are coaxially arranged and connected through a plurality of supporting columns. A containing groove for containing a hub steel ring is formed in the upper surface of the upper disc body, inwards-concave arc-shaped grooves are evenly formed in the groove wall of the containing groove, and the groove bottoms of the arc-shaped grooves extend to the position below the upper disc body to form openings. Clamping blocks matched with the outer wall of the hub steel ring are rotationally connected into the containing grooves, the bottom ends of the clamping blocks extend to the position between the lower disc body and the upper disc body, and a clamping structure for controlling the clamping blocks to rotate so as to clamp or loosen the hub steel ring is arranged between the lower disc body and the upper disc body.

Description

Technical Field

[0001] This invention relates to the field of automobile manufacturing technology, specifically to a wheel hub steel circumferential seam welding device. Background Technology

[0002] As a key load-bearing component of automobile wheels, the quality of the circumferential weld of the wheel hub directly affects the safety performance and service life of the wheel hub. At present, the circumferential weld of wheel hubs is mostly carried out by submerged arc automatic welding. During the welding process, the wheel hub needs to rotate at a constant speed to complete the formation of the entire circumferential weld of the wheel hub.

[0003] In existing wheel rim welding equipment, the grounding of the welding circuit is usually achieved by using an independent grounding clamp, which is directly clamped to the outer wall or edge of the wheel rim using alligator clips or C-clamps. A thicker cable is connected to the rear end of the grounding clamp to carry the welding current.

[0004] However, during the rotary welding of wheel hub steel rims, the grounding clamp and its cable rotate with the workpiece, making them prone to entanglement and twisting, leading to cable fatigue fracture, loose joints, or changes in contact pressure. Practice has shown that this grounding method has the following drawbacks: First, cable entanglement limits the continuous rotation of the workpiece, making multi-turn continuous welding difficult; second, poor contact causes fluctuations in welding current, making the weld prone to defects such as porosity and slag inclusions; third, the grounding clamp position needs to be manually adjusted repeatedly, affecting the cycle time and consistency of automated welding. Summary of the Invention

[0005] To address the aforementioned technical shortcomings, the present invention aims to provide a wheel hub steel rim circumferential welder, which has the advantages of stable welding circuit conduction and maintaining continuous cleanliness of the clamping surface.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] This invention provides a wheel hub steel ring circumferential weld device, including a bracket, a wheel hub steel ring and a welding robot mounted on the bracket, and also includes a clamping assembly; The clamping assembly includes a lower plate and an upper plate arranged coaxially, which are connected by a number of pillars. The upper surface of the upper plate is provided with a receiving groove for accommodating the wheel hub steel ring. The groove wall is evenly provided with concave arc-shaped grooves, and the bottom of the arc-shaped grooves extends to the bottom of the upper plate to form an opening. The receiving groove is rotatably connected to a clamping block adapted to the outer wall of the wheel hub steel ring. The bottom end of the clamping block extends between the lower plate and the upper plate. A clamping structure is provided between the lower plate and the upper plate to control the rotation of the clamping block to clamp or release the wheel hub steel ring. The bracket is provided with a carbon brush conductive structure that cooperates with the lower plate body, and the clamp assembly is provided with a conductive path so that the current is led to the clamp block through the carbon brush conductive structure.

[0008] By adopting the above technical solution, the clamping block is rotated by setting a clamping structure between the lower plate and the upper plate. While clamping the wheel hub steel ring, the clamping block conducts the welding current to the clamping block through the carbon brush conductive structure and the internal conductive path, and then conducts it to the wheel hub steel ring. This structure makes the clamping assembly itself part of the conductive circuit, eliminating the need for an additional independent grounding clamp. It completely solves the problem of the cable getting tangled and pulled as the workpiece rotates during the welding process, and is suitable for continuous rotation welding conditions.

[0009] The clamping block applies a constant and controllable clamping force to the wheel hub steel ring under the action of the clamping structure. The carbon brush conductive structure introduces current into the rotating clamping assembly through sliding contact. The internal conductive path reliably transmits the current to the clamping block. Compared with the traditional grounding clamp, the conductive contact of this device does not fluctuate with the rotation of the workpiece, the contact resistance is stable, and the welding current is continuous and stable. This effectively reduces welding defects such as porosity and lack of fusion caused by poor grounding and improves the first-pass yield of circumferential welds.

[0010] The clamping and electrical conduction functions of the fixture assembly are completed simultaneously. The operator only needs to place the wheel hub steel ring in the receiving groove and start the clamping structure to achieve workpiece positioning and electrical connection at the same time. No additional grounding clamp is required. This structure is easy to integrate with welding robots and automatic loading and unloading systems, reducing auxiliary time and improving production cycle and automation level.

[0011] The lower and upper plates are connected by pillars to form a stable frame structure. The design of the receiving groove and the arc groove provides rotation space for the clamping block and extends the bottom of the clamping block between the two plates, which facilitates the arrangement of the clamping structure. The carbon brush conductive structure is located between the support and the lower plate. The overall layout is compact and does not occupy the operating space of the welding robot, which is conducive to multi-station collaborative operation.

[0012] Preferably, the clamping structure includes a first short shaft rotatably connected to the lower plate, on which a drive gear is nested and fixed coaxially; the upper surface of the lower plate is also rotatably connected to three evenly arranged second short shafts, each second short shaft having a follower gear coaxially fixed and meshing with the drive gear, and each follower gear having a connecting rod fixed on it, the end of which is fixedly connected to the bottom end of the corresponding clamping block. Preferably, the lower plate body has a recessed movable groove on its side wall, the bottom end of the first short shaft extends into the movable groove and is rotatably connected to the bottom of the movable groove; a first swing rod is fixed on the shaft section of the first short shaft located in the movable groove, and a spring piece is connected between the first swing rod and the side wall of the movable groove; a second swing rod is rotatably connected to the bracket, the second swing rod is located beside the movable groove and is correspondingly arranged with the first swing rod, a second motor is fixed on the bracket, and the output end of the second motor is connected to the second swing rod.

[0013] Preferably, a conductive ring is fixed on the upper surface of the lower plate, and the end of the carbon brush of the carbon brush conductive structure 10 slides in contact with the conductive ring; the lower plate, the first short shaft, the first rocker arm, the driving gear, the following gear, the second short shaft, and the connecting rod are all made of insulating material; a copper slider is fixed at the end of the connecting rod, and both the upper and lower ends of the copper slider protrude through the connecting rod. The copper slider protruding from the lower end of the connecting rod is slidably connected to the conductive ring, and the copper slider protruding from the upper end of the connecting rod is connected to a clamping block; the clamping block is made of conductive material.

[0014] Preferably, the contact surface between the clamping block and the wheel hub steel rim is provided with knurled texture.

[0015] Preferably, the upper plate body has mounting cavities corresponding to the positions of each arc-shaped groove, and each mounting cavity is provided with an air guide assembly; the air guide assembly includes a piston compression mechanism, a valve mechanism, a triggering mechanism and a transmission mechanism provided in the mounting cavity.

[0016] Preferably, the piston compression mechanism includes a conduit fixed in the mounting cavity, with a first partition, a second partition, and a third partition sequentially arranged along the axial direction inside the conduit, dividing the inner cavity of the conduit into a first cavity, a second cavity, a third cavity, and a fourth cavity that are connected in sequence; a support plate is fixed in the first cavity, with a first guide hole penetrating through the support plate, and a slide rod is slidably connected in the first guide hole, with one end of the slide rod extending out of the conduit and the other end fixed with a piston that slides and seals with the first cavity; a U-shaped rod is connected to the end of the slide rod extending out of the conduit, and the U-shaped rod is connected to a transmission mechanism.

[0017] Preferably, the valve mechanism includes a first spring and a rubber plug disposed in the second cavity. One end of the first spring is fixed to the inner wall of the second cavity, and the other end is connected to the rubber plug. A second guide hole is provided on the first partition plate, connecting the first cavity and the second cavity, and the rubber plug closes the second guide hole. A third guide hole is provided on the second partition plate, connecting the second cavity and the third cavity. A guide post is slidably connected in the third guide hole, and a rubber sealing ring for closing the third guide hole is fixed at the end of the guide post. A fourth guide hole is provided on the third partition plate, connecting the third cavity and the fourth cavity. The guide post passes through the fourth guide hole and is slidably connected to the fourth guide hole. A connecting ring is fixed on the guide post, and a second spring is fixed on the third partition plate. The other end of the second spring is fixedly connected to the connecting ring. An air duct is connected to the second partition plate, and the air duct communicates with the third guide hole.

[0018] Preferably, the triggering mechanism includes a movable rod slidably connected to the fourth cavity, with a push block fixed at the end of the movable rod; a push rod is slidably connected to the mounting cavity, the push rod is connected to the outer wall of the conduit by a third spring, and the end of the push rod away from the conduit passes into the arc-shaped groove.

[0019] Preferably, the transmission mechanism includes a third short shaft rotatably connected to the mounting cavity, a circular plate coaxially fixed on the third short shaft, and a fourth short shaft eccentrically fixed on the circular plate; a strip plate is sleeved on the fourth short shaft, and a strip hole is formed on the strip plate, through which the fourth short shaft passes and is slidably connected; a push rod is fixed on the strip plate, and the push rod is fixedly connected to a U-shaped rod; a follower block is fixed on the clamping block, and a strip groove communicating with the mounting cavity is formed on the wall of the arc-shaped groove, through which the follower block passes and is slidably connected; a rack is slidably connected in the mounting cavity, and an extension block cooperating with another push rod is fixed on the rack; a movable gear meshing with the rack is fixed on the third short shaft.

[0020] The beneficial effects of this invention are as follows: 1. By setting a clamping structure between the lower and upper plates to control the rotation of the clamping block, the clamping block clamps the wheel hub steel ring while simultaneously guiding the welding current to the clamping block through the carbon brush conductive structure and internal conductive path, and then conducting it to the wheel hub steel ring. This structure makes the clamping assembly itself part of the conductive circuit, eliminating the need for an additional independent grounding clamp, and completely solving the problem of cables getting tangled and pulled as the workpiece rotates during the welding process. It is suitable for continuous rotation welding conditions.

[0021] 2. By using insulating materials for the lower plate, first short shaft, first rocker arm, drive gear, follower gear, second short shaft, and connecting rod, the mechanical transmission chain is completely isolated from the welding current circuit. The welding current is directly transmitted to the clamping block through the conductive ring and copper slider, without flowing through any transmission components, thus completely avoiding problems such as overheating, electrolytic corrosion, and lubrication failure of transmission components caused by current diversion.

[0022] 3. The rotational motion of the clamping block itself drives the transmission mechanism to compress air, and automatically triggers the blowing before the clamping block contacts the workpiece, ensuring that the contact surface of the clamping block is always clean without manual intervention, thus ensuring the reliability of conductive contact. Attached Figure Description

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

[0024] Figure 1 This is a schematic diagram of the structure of this embodiment; Figure 2 This is a schematic diagram illustrating the conductive structure of the carbon brush in this embodiment; Figure 3 This is a schematic diagram illustrating the structure of the arc-shaped groove in this embodiment; Figure 4 This is a schematic diagram illustrating the structure of the clamping block in this embodiment; Figure 5 This embodiment Figure 4 Enlarged structural diagram at point A; Figure 6 This is a structural schematic diagram illustrating the second minor axis in this embodiment; Figure 7 This is a schematic diagram illustrating the structure of the air duct in this embodiment; Figure 8 This is a schematic diagram of the cross-sectional structure of the catheter in this embodiment; Figure 9 This is a schematic diagram illustrating the structure of the strip hole in this embodiment.

[0025] Explanation of reference numerals in the attached figures: In the diagram: 1. Bracket; 2. Wheel hub rim; 3. Welding robot; 4. Lower plate; 5. Upper plate; 6. Support column; 7. Receiving groove; 8. Arc-shaped groove; 9. Clamping block; 10. Carbon brush conductive structure; 11. First motor; 12. First short shaft; 13. Drive gear; 14. Second short shaft; 15. Follower gear; 16. Connecting rod; 17. Movable groove; 18. First swing arm; 19. Second swing arm; 20. Second motor; 21. Conduit; 22. First partition; 23. Second partition; 24. Third partition; 25. First cavity; 26. Second cavity; 27. Third cavity 28. Fourth cavity; 29. ​​Slide rod; 30. Piston; 31. U-shaped rod; 32. First spring; 33. Rubber plug; 34. Second guide hole; 35. Third guide hole; 36. Guide post; 37. Fourth guide hole; 38. Connecting ring; 39. Second spring; 40. Moving rod; 41. Push block; 42. Top rod; 43. Third spring; 44. Circular plate; 45. Fourth short shaft; 46. Strip plate; 47. Strip hole; 48. Push rod; 49. Strip groove; 50. Air guide pipe; 51. Rack; 52. Follower block; 53. Extension block; 54. Movable gear. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1 like Figures 1-6The first embodiment of the present invention provides a wheel hub steel ring circumferential weld device, including a bracket 1, a wheel hub steel ring 2 and a welding robot 3 mounted on the bracket 1, and also includes a clamping assembly; The clamping assembly includes a lower plate 4 and an upper plate 5 arranged coaxially, which are connected by a number of pillars 6; The upper surface of the upper plate body 5 is provided with a receiving groove 7 for accommodating the wheel hub steel ring 2. The groove wall of the receiving groove 7 is evenly provided with concave arc grooves 8, and the bottom of the arc grooves 8 extends to the bottom of the upper plate body 5 to form an opening. A clamping block 9 adapted to the outer wall of the wheel hub steel ring 2 is rotatably connected in the receiving groove 7. The bottom end of the clamping block 9 extends between the lower plate 4 and the upper plate 5. A clamping structure is provided between the lower plate 4 and the upper plate 5 to control the rotation of the clamping block 9 to clamp or release the wheel hub steel ring 2. The bracket 1 is provided with a carbon brush conductive structure 10 that cooperates with the lower plate 4. The clamp assembly is provided with a conductive path so that the current is led to the clamp block 9 through the carbon brush conductive structure 10.

[0028] A first motor 11 that drives the lower plate 4 to rotate is fixed on the bracket 1.

[0029] By setting a clamping structure between the lower plate 4 and the upper plate 5 to control the rotation of the clamping block 9, the clamping block 9 clamps the wheel hub steel ring 2 while simultaneously guiding the welding current to the clamping block 9 through the carbon brush conductive structure 10 and the internal conductive path, and then conducting it to the wheel hub steel ring 2. This structure makes the clamping assembly itself part of the conductive circuit, eliminating the need for an additional independent grounding clamp, and completely solving the problem of the cable getting tangled and pulled as the workpiece rotates during the welding process. It is suitable for continuous rotation welding conditions.

[0030] Under the action of the clamping structure, the clamping block 9 applies a constant and controllable clamping force to the wheel hub steel ring 2. The carbon brush conductive structure 10 introduces current into the rotating clamping assembly through sliding contact. The internal conductive path reliably transmits the current to the clamping block 9. Compared with the traditional grounding clamp, the conductive contact of this device does not fluctuate with the rotation of the workpiece, the contact resistance is stable, and the welding current is continuous and stable. This effectively reduces welding defects such as porosity and lack of fusion caused by poor grounding and improves the first-pass yield of circumferential welds.

[0031] The clamping and electrical conduction functions of the fixture assembly are completed simultaneously. The operator only needs to place the wheel hub steel ring 2 in the receiving groove 7 and start the clamping structure to achieve workpiece positioning and electrical connection at the same time. No additional grounding clamp is required. This structure is easy to integrate with the welding robot 3 and the automatic loading and unloading system, reducing auxiliary time and improving production cycle and automation level.

[0032] The lower plate 4 and the upper plate 5 are connected by the support column 6 to form a stable frame structure; the design of the receiving groove 7 and the arc groove 8 provides rotation space for the clamping block 9 and extends the bottom of the clamping block 9 to the space between the two plates, which facilitates the arrangement of the clamping structure; the carbon brush conductive structure 10 is located between the support 1 and the lower plate 4, and the overall layout is compact, does not occupy the operating space of the welding robot 3, and is conducive to multi-station collaborative operation.

[0033] like Figure 6 The clamping structure includes a first short shaft 12 rotatably connected to the lower plate 4, and a drive gear 13 coaxially fixed to the first short shaft 12. The upper surface of the lower plate 4 is also rotatably connected to three evenly arranged second short shafts 14. Each second short shaft 14 is coaxially fixed with a follower gear 15 that meshes with the drive gear 13. Each follower gear 15 is fixed with a connecting rod 16, and the end of the connecting rod 16 is fixedly connected to the bottom end of the corresponding clamping block 9.

[0034] like Figure 6 The lower plate body 4 has a recessed movable groove 17 on its side wall. The bottom end of the first short shaft 12 extends into the movable groove 17 and is rotatably connected to the bottom of the movable groove 17. A first swing rod 18 is fixed on the shaft section of the first short shaft 12 located in the movable groove 17. A spring piece is connected between the first swing rod 18 and the side wall of the movable groove 17. A second swing rod 19 is rotatably connected to the bracket 1. The second swing rod 19 is located beside the movable groove 17 and is correspondingly set to the first swing rod 18. A second motor 20 is fixed on the bracket 1. The output end of the second motor 20 is connected to the second swing rod 19.

[0035] The first swing arm 18 is connected to the side wall of the movable groove 17 by a spring sheet. Under normal conditions, the spring force of the spring sheet keeps the first swing arm 18 in its initial position. Through the transmission of the first short shaft 12, the driving gear 13, the follower gear 15 and the connecting rod 16, the clamping block 9 always keeps the wheel hub steel ring 2 in a clamped state. This normally closed design ensures that the fixture can still reliably clamp the workpiece in the power-off or non-working state, avoids the workpiece from accidentally loosening, and improves the safety and reliability of the equipment.

[0036] The second motor 20 drives the second swing arm 19 to rotate into the movable slot 17, pushing the first swing arm 18 to rotate against the spring force of the spring plate, thereby driving the gear transmission system composed of the drive gear 13 and the follower gear 15 to release the clamping block 9. The single drive gear 13 synchronously drives the three follower gears 15 to ensure that the three clamping blocks 9 are clamped or released synchronously, avoiding workpiece eccentricity or unstable clamping due to asynchronous clamping. All transmission components are integrated in the limited space between the lower plate 4 and the upper plate 5, and the overall structure is compact and does not interfere with the operating space of the welding robot 3.

[0037] The width of the second swing arm 19 is less than the height of the movable groove 17, and the width of the second swing arm 19 is greater than the width of the first swing arm 18.

[0038] A conductive ring is fixed on the upper surface of the lower plate 4, and the carbon brush end of the carbon brush conductive structure 10 slides in contact with the conductive ring; the lower plate 4, the first short shaft 12, the first swing rod 18, the driving gear 13, the follower gear 15, the second short shaft 14, and the connecting rod 16 are all made of insulating material; a copper slider is fixed at the end of the connecting rod 16, and both the upper and lower ends of the copper slider protrude through the connecting rod 16. The copper slider protruding from the lower end of the connecting rod 16 is slidably connected to the conductive ring, and the copper slider protruding from the upper end of the connecting rod 16 is connected to the clamping block 9; the clamping block 9 is made of conductive material.

[0039] By using insulating materials for the lower plate 4, the first short shaft 12, the first rocker arm 18, the driving gear 13, the follower gear 15, the second short shaft 14, and the connecting rod 16, the mechanical transmission chain is completely isolated from the welding current circuit. The welding current is directly transmitted to the clamping block 9 through the conductive ring and the copper slider, without flowing through any transmission components, thus completely avoiding problems such as overheating, electrolytic corrosion, and lubrication failure of the transmission components caused by current diversion.

[0040] By using insulating materials (such as PEEK, polyimide, or high-strength nylon) for the entire transmission components, there is no need to set up additional complex structures such as insulating bearings and insulating gaskets on the metal parts. This reduces the number of parts, simplifies the assembly process, and reduces the risk of multi-interface insulation failure.

[0041] The conductive ring is embedded in the lower plate 4, and its surface is treated with wear-resistant coatings such as silver or chrome plating. It forms a sliding electrical contact with the carbon brush. The carbon brush is a consumable part that can be replaced periodically. The copper slider and clamp 9 have no relatively moving parts, so there is no wear problem.

[0042] When the clamping assembly is in the waiting state, the clamping block 9 is kept in the normally closed clamping position under the action of the spring piece, that is, the clamping block 9 retracts inward. At this time, the clamping block 9 is retracted into the arc groove 8, the transmission mechanism of the air guide assembly is in the initial position, the valve mechanism is in the closed state, and the third guide hole 35 and the air guide pipe 50 are closed by the guide post 36. When in use, connect the power supply, turn on the switch, and turn on the second motor 20. The second motor 20 starts and drives the second swing arm 19 to swing into the movable groove 17. The second swing arm 19 pushes the first swing arm 18 to rotate. The first swing arm 18 drives the first short shaft 12 to rotate. The first short shaft 12 drives the drive gear 13 to rotate. The drive gear 13 drives the three follower gears 15 to rotate synchronously through meshing. The follower gears 15 drive the connecting rod 16 to swing. The clamping block 9 at the end of the connecting rod 16 overcomes the elastic force of the spring and rotates outward. The clamping block 9 moves in the arc groove 8. The three clamping blocks 9 unfold outward. At this time, the operator can place the wheel hub steel ring 2 into the receiving groove 7 of the upper plate body 5. Then, the second motor 20 drives the second rocker arm 19 to rotate in the opposite direction. The second rocker arm 19 exits the movable slot 17, and the spring plate resets, driving the first rocker arm 18, the first short shaft 12, the driving gear 13, the follower gear 15, and the connecting rod 16 to rotate in the opposite direction. The clamping block 9 retracts inward, and the knurled contact surface on the clamping block 9 pierces the oxide layer on the surface of the wheel hub steel ring 2 under the action of clamping force, forming a low-resistance metal contact, thus completing the clamping and positioning of the wheel hub steel ring 2.

[0043] Example 2 Based on Embodiment 1, the contact surface between the clamping block 9 and the wheel hub rim 2 is provided with knurled texture. Under the action of clamping force, the knurled contact surface can pierce the oxide layer on the surface of the wheel hub rim 2, ensuring low-resistance contact and extending the service life of the clamping block 9.

[0044] Example 3 Based on Example 2, such as Figures 7-9 The upper plate 5 has mounting cavities corresponding to the positions of each arc-shaped groove 8, and each mounting cavity is equipped with an air guide assembly. The air guide assembly includes a piston compression mechanism, a valve mechanism, a triggering mechanism, and a transmission mechanism located in the mounting cavity. The transmission mechanism is linked with the clamping block 9, converting the rotational motion of the clamping block 9 into the reciprocating compression motion of the piston 30 compression mechanism. The triggering mechanism cooperates with the clamping block 9, triggering the valve mechanism to open when the clamping block 9 rotates to the end position of the arc-shaped groove 8, so that the compressed air is blown towards the clamping block 9 through the air guide pipe 50 to clean the dirt on the surface of the clamping block 9.

[0045] The piston 30 compression mechanism includes a conduit 21 fixed in the mounting cavity. A first partition 22, a second partition 23, and a third partition 24 are sequentially arranged along the axial direction inside the conduit 21, dividing the inner cavity of the conduit 21 into a first cavity 25, a second cavity 26, a third cavity 27, and a fourth cavity 28 that are connected in sequence. A support plate is fixed in the first cavity 25, and a first guide hole is passed through the support plate. A slide rod 29 is slidably connected in the first guide hole. One end of the slide rod 29 extends out of the conduit 21, and the other end is fixed with a piston 30 that slides and seals with the first cavity 25. A U-shaped rod 31 is connected to the end of the slide rod 29 that extends out of the conduit 21, and the U-shaped rod 31 is connected to the transmission mechanism.

[0046] like Figure 7 and Figure 8The valve mechanism includes a first spring 32 and a rubber plug 33 disposed in the second cavity 26. One end of the first spring 32 is fixed to the inner wall of the second cavity 26, and the other end is connected to the rubber plug 33. A second guide hole 34 is provided on the first partition 22 to connect the first cavity 25 and the second cavity 26. The rubber plug 33 closes the second guide hole 34. A third guide hole 35 is provided on the second partition 23 to connect the second cavity 26 and the third cavity 27. A guide post 36 is slidably connected in the third guide hole 35. A rubber sealing ring for sealing the third guide hole 35 is fixed at the end of the 6; a fourth guide hole 37 is opened on the third partition 24 to connect the third cavity 27 and the fourth cavity 28; a guide post 36 passes through the fourth guide hole 37 and is slidably connected to the fourth guide hole 37; a connecting ring 38 is fixed on the guide post 36; a second spring 39 is fixed on the third partition 24; the other end of the second spring 39 is fixedly connected to the connecting ring 38; a duct 50 is connected to the second partition 23, and the duct 50 is connected to the third guide hole 35.

[0047] The second spring 39 does not close the air duct 50 in its natural state, but closes the air duct 50 when it is squeezed by the push block 41.

[0048] like Figure 7 and Figure 8 The triggering mechanism includes a movable rod 40 that is slidably connected to the fourth cavity 28, and a push block 41 is fixed at the end of the movable rod 40; a push rod 42 is slidably connected to the mounting cavity, and the push rod 42 is connected to the outer wall of the conduit 21 by a third spring 43, and the end of the push rod 42 away from the conduit 21 is inserted into the arc-shaped groove 8.

[0049] When the clamping block 9 rotates to contact the push rod 42, the push rod 42 pushes the moving rod 40 and the push block 41 to move towards the guide post 36. The push block 41 pushes the guide post 36 to move, causing the second spring 39 to stretch. The rubber sealing ring at the end of the guide post 36 disengages from the third guide hole 35, and the third guide hole 35 and the air duct 50 open, allowing compressed air to be discharged through the air duct 50. When the clamping block 9 disengages from the push rod 42, the second spring 39 resets, causing the guide post 36 to close the third guide hole 35. The third spring 43 resets, causing the push rod 42 to return to its original position.

[0050] The transmission mechanism includes a third short shaft rotatably connected to the mounting cavity, a circular plate 44 coaxially fixed on the third short shaft, and a fourth short shaft 45 eccentrically fixed on the circular plate 44; a strip plate 46 is sleeved on the fourth short shaft 45, and a strip hole 47 is opened on the strip plate 46, through which the fourth short shaft 45 passes and is slidably connected; a push rod 48 is fixed on the strip plate 46, and the push rod 48 is fixedly connected to the U-shaped rod 31; a follower block 52 is fixed on the clamping block 9, and a strip groove 49 connecting the arc groove 8 and the mounting cavity is opened on the groove wall, through which the follower block 52 passes and is slidably connected; a rack 51 is slidably connected in the mounting cavity, and an extension block 53 that cooperates with another push rod 48 is fixed on the rack 51; a movable gear 54 that meshes with the rack 51 is fixed on the third short shaft.

[0051] When the clamping block 9 rotates, another push rod 48 drives the rack 51 to move. The rack 51 drives the third short shaft and the circular plate 44 to rotate through the movable gear 54. The circular plate 44 drives the strip plate 46 to reciprocate through the fourth short shaft 45. The strip plate 46 drives the slide rod 29 and the piston 30 to reciprocate through the push rod 48 and the U-shaped rod 31 to achieve air compression. The push rod 48 is slidably connected to the inner wall of the mounting cavity through the slide rail.

[0052] As the clamping block 9 moves away from the wheel hub steel ring 2 in the arc groove 8, the follower block 52 on the clamping block 9 drives the rack 51 to move through the strip groove 49. The rack 51 drives the movable gear 54 and the third short shaft to rotate through meshing. The third short shaft drives the circular plate 44 to rotate. The fourth short shaft 45 on the circular plate 44 drives the push rod 48 and the U-shaped rod 31 to reciprocate through the strip plate 46. The U-shaped rod 31 drives the slide rod 29 and the piston 30 to reciprocate in the guide tube 21, compressing the air and storing it in the second cavity 26 of the guide tube 21. When the clamping block 9 rotates to the far end of the arc groove 8, the clamping block 9 contacts the push rod 42, pushing the push rod 42 to move into the mounting cavity against the third spring 43. The push rod 42 pushes the moving rod 40 and the push block 41 to move. The push block 41 moves to a position where it does not contact the guide post 36. The moving rod 40 contacts the guide post 36, and the second spring 39 rebounds, driving the guide post 36 to move closer to the fourth partition. The rubber sealing ring at the end of the guide post 36 does not seal the air duct 50. The third guide hole 35 and the air duct 50 are connected to the second cavity 26. The compressed air in the second cavity 26 is sprayed out instantly through the air duct 50 and blown toward the knurled contact surface of the clamping block 9, removing flux dust, aluminum chips, oil stains and other contaminants from the surface of the clamping block 9. After the cleaning is completed and the wheel hub steel ring 2 is installed, the clamping block 9 rotates to the clamping position, the third spring 43 rebounds, the push rod 42 returns to the initial position, the push block 41 contacts the end of the guide post 36, and the push block 41 and the moving rod 40 smoothly transition at an angle to avoid the push block 41 being stuck and unable to move back to contact the guide post 36. The second spring 39 resets and drives the guide post 36 to close the third guide hole 35 and the air duct 50, completing one cleaning cycle. After clamping the wheel hub steel ring 2 with clamping block 9, welding robot 3 starts, welding torch moves to the position of wheel hub steel ring 2 to be welded, flux delivery pipe is opened, flux is continuously spread on the weld area, carbon brush conductive structure 10 on bracket 1 slides in contact with conductive ring on the upper surface of lower plate 4, welding current is transmitted to clamping block 9 through carbon brush conductive structure 10, conductive ring, and copper slider, and then transmitted to wheel hub steel ring 2 through the knurled contact surface of clamping block 9, forming a complete welding circuit; During welding, the lower plate 4, upper plate 5, and clamping block 9 rotate together with the wheel hub steel ring 2. The conductive ring and the carbon brush conductive structure 10 maintain sliding contact, and the copper slider maintains sliding contact with the conductive ring to ensure continuous and stable transmission of welding current. The welding torch remains fixed, and the wheel hub steel ring 2 rotates at a uniform speed to complete the welding of the entire circumferential seam. After welding is completed, the welding machine stops, the flux delivery pipe is closed, the welding robot 3 is reset, the second motor 20 is restarted, and the second swing arm 19 is driven to swing into the movable slot 17. The second swing arm 19 pushes the first swing arm 18 to rotate, which drives the first short shaft 12, the drive gear 13, the follower gear 15, and the connecting rod 16 to rotate. The clamping block 9 rotates outward to release the wheel hub steel ring 2. The operator takes out the welded wheel hub steel ring 2, completing one work cycle and one cleaning cycle.

[0053] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A wheel hub steel rim circumferential welder, comprising a support (1), a wheel hub steel rim (2), and a welding robot (3) mounted on the support (1), characterized in that: It also includes a clamping assembly; The clamp assembly includes a lower plate (4) and an upper plate (5) arranged coaxially, which are connected by a number of pillars (6); The upper surface of the upper plate (5) is provided with a receiving groove (7) for accommodating the wheel hub steel ring (2). The groove wall of the receiving groove (7) is evenly provided with concave arc grooves (8), and the bottom of the arc grooves (8) extends to the bottom of the upper plate (5) to form an opening. The receiving groove (7) is rotatably connected to a clamping block (9) adapted to the outer wall of the wheel hub steel ring (2). The bottom end of the clamping block (9) extends between the lower plate (4) and the upper plate (5). A clamping structure is provided between the lower plate (4) and the upper plate (5) to control the rotation of the clamping block (9) to clamp or release the wheel hub steel ring (2). The bracket (1) is provided with a carbon brush conductive structure (10) that cooperates with the lower plate (4). The clamp assembly is provided with a conductive path so that the current is led to the clamp block (9) through the carbon brush conductive structure (10).

2. The wheel hub steel rim circumferential weld device as described in claim 1, characterized in that, The clamping structure includes a first short shaft (12) rotatably connected to the lower plate (4), and a drive gear (13) is nested on the first short shaft (12) and fixed coaxially with the first short shaft (12). The upper surface of the lower plate (4) is also rotatably connected to three evenly arranged second short shafts (14). Each second short shaft (14) is coaxially fixed with a follower gear (15) that meshes with the driving gear (13). Each follower gear (15) is fixed with a connecting rod (16), and the end of the connecting rod (16) is fixedly connected to the bottom end of the corresponding clamping block (9).

3. The wheel hub steel rim circumferential weld device as described in claim 2, characterized in that, The lower plate (4) has a recessed movable groove (17) on its side wall. The bottom end of the first short shaft (12) extends into the movable groove (17) and is rotatably connected to the bottom of the movable groove (17). The first short shaft (12) is fixed on the shaft section inside the movable groove (17) with a first rocker arm (18) and a spring piece is connected between the first rocker arm (18) and the side wall of the movable groove (17); A second swing arm (19) is rotatably connected to the bracket (1). The second swing arm (19) is located next to the movable groove (17) and is corresponding to the first swing arm (18). A second motor (20) is fixed on the bracket (1). The output end of the second motor (20) is connected to the second swing arm (19).

4. The wheel hub steel rim circumferential weld device as described in claim 3, characterized in that, A conductive ring is fixed on the upper surface of the lower disk body (4), and the carbon brush end of the carbon brush conductive structure (10) slides in contact with the conductive ring; The lower plate (4), the first short shaft (12), the first rocker arm (18), the driving gear (13), the follower gear (15), the second short shaft (14), and the connecting rod (16) are all made of insulating material; A copper slider is fixed at the end of the connecting rod (16). Both the upper and lower ends of the copper slider protrude from the connecting rod (16). The copper slider protruding from the lower end of the connecting rod (16) is slidably connected to the conductive ring, and the copper slider protruding from the upper end of the connecting rod (16) is connected to the clamp (9). The clamp (9) is made of conductive material.

5. The wheel hub steel rim circumferential weld device as described in claim 1, characterized in that, The contact surface between the clamping block (9) and the wheel hub steel ring (2) is provided with knurled texture.

6. The wheel hub steel rim circumferential weld device as described in claim 1, characterized in that, The upper plate (5) has an installation cavity corresponding to each arc groove (8) and each installation cavity is provided with an air guide component. The air guide assembly includes a piston compression mechanism, a valve mechanism, a triggering mechanism, and a transmission mechanism disposed within the mounting cavity.

7. The wheel hub steel rim circumferential weld device as described in claim 6, characterized in that, The piston compression mechanism includes a conduit (21) fixed in the mounting cavity. The conduit (21) is provided with a first partition (22), a second partition (23) and a third partition (24) in sequence along the axial direction, which divides the inner cavity of the conduit (21) into a first cavity (25), a second cavity (26), a third cavity (27) and a fourth cavity (28) that are connected in sequence. A support plate is fixed inside the first cavity (25), and a first guide hole is passed through the support plate. A slide rod (29) is slidably connected inside the first guide hole. One end of the slide rod (29) extends out of the guide tube (21), and the other end is fixed with a piston (30) that slides and seals with the first cavity (25). The slide bar (29) has a U-shaped rod (31) connected to one end of the guide tube (21), and the U-shaped rod (31) is connected to the transmission mechanism.

8. The wheel hub steel rim circumferential weld device as described in claim 7, characterized in that, The valve mechanism includes a first spring (32) and a rubber plug (33) disposed in the second cavity (26). One end of the first spring (32) is fixed to the inner wall of the second cavity (26), and the other end is connected to the rubber plug (33). The first partition (22) has a second guide hole (34) that connects the first cavity (25) and the second cavity (26), and the rubber plug (33) closes the second guide hole (34). The second partition (23) has a third guide hole (35) that connects the second cavity (26) and the third cavity (27). A guide post (36) is slidably connected in the third guide hole (35). A rubber sealing ring for sealing the third guide hole (35) is fixed at the end of the guide post (36). The third partition (24) has a fourth guide hole (37) that connects the third cavity (27) and the fourth cavity (28). The guide post (36) passes through the fourth guide hole (37) and is slidably connected to the fourth guide hole (37). A connecting ring (38) is fixed on the guide post (36), and a second spring (39) is fixed on the third partition plate (24). The other end of the second spring (39) is fixedly connected to the connecting ring (38). A duct (50) is connected to the second partition (23), and the duct (50) is connected to the third guide hole (35).

9. The wheel hub steel rim circumferential weld device as described in claim 8, characterized in that, The triggering mechanism includes a movable rod (40) that is slidably connected in the fourth cavity (28), and a push block (41) is fixed at the end of the movable rod (40). A push rod (42) is slidably connected inside the mounting cavity. The push rod (42) is connected to the outer wall of the conduit (21) by a third spring (43). The end of the push rod (42) away from the conduit (21) is inserted into the arc groove (8).

10. The wheel hub steel rim circumferential weld device as described in claim 9, characterized in that, The transmission mechanism includes a third short shaft rotatably connected to the mounting cavity, a circular plate (44) coaxially fixed on the third short shaft, and a fourth short shaft (45) eccentrically fixed on the circular plate (44). The fourth short shaft (45) is fitted with a strip plate (46), and a strip hole (47) is provided on the strip plate (46). The fourth short shaft (45) passes through the strip hole (47) and is slidably connected to the strip hole (47). A push rod (48) is fixed on the strip plate (46), and the push rod (48) is fixedly connected to the U-shaped rod (31); A follower block (52) is fixed on the clamping block (9). The wall of the arc groove (8) is provided with a strip-shaped sliding groove (49) that connects the arc groove (8) and the mounting cavity. The follower block (52) passes through the strip-shaped sliding groove (49) and slides in connection with the strip-shaped sliding groove (49). A rack (51) is slidably connected inside the mounting cavity, and an extension block (53) that cooperates with another push rod (48) is fixed on the rack (51). A movable gear (54) that meshes with a rack (51) is fixed on the third short shaft.

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