Grill spot welder and spot welding method

Abstract

The application discloses a grill spot welding machine and a spot welding method, and relates to the technical field of resistance spot welding equipment. The grill spot welding machine comprises a bottom plate, a supporting block and a fixing frame fixed to the upper end of the bottom plate, a controller fixed to the side wall of the supporting block, a moving assembly arranged above the bottom plate, a transverse feeding mechanism fixed to the upper end of the bottom plate, a lateral pressing mechanism fixed to the side wall of the supporting block, a welding gun lifting mechanism arranged on the fixing frame, a workpiece lifting mechanism arranged on the transverse feeding mechanism, a workpiece positioning mechanism and an elastic ejection mechanism arranged on the moving assembly; the moving assembly comprises a rodless air cylinder and a moving block driven by the rodless air cylinder; and the elastic ejection mechanism is provided with a cross-shaped limiting structure. The grill body is automatically fed and discharged, accurately positioned and spot welded through the linkage of multiple mechanisms, the problems of difficult positioning, low welding efficiency and complicated manual transfer during welding of the grill body are effectively solved, and the application is suitable for the automatic welding scene of grill metal workpieces.

Description

Technical Field

[0001] This invention relates to the field of resistance spot welding equipment technology, specifically to a grill spot welding machine and spot welding method. Background Technology

[0002] In the metal furniture and daily necessities manufacturing industry, grill racks are common metal frame products. Grill racks are typically formed by welding together an outer frame, a cross-shaped support frame, internal support rings, and multiple legs. Currently, the welding of the grill rack legs to the inner frame mostly relies on manual loading, manual positioning, and operation of spot welding machines. This method is not only labor-intensive and inefficient, but manual positioning often results in inaccurate welding positions, poor product consistency, and a high risk of producing defective products.

[0003] With the development of automated welding technology, some companies have introduced automated welding equipment. However, existing automated welding equipment is mostly designed for flat plates or regular pipes. For special non-planar structures such as grills with outer and inner frames and requiring precise positioning of cross-shaped intersections, there is a lack of suitable automatic clamping, indexing, and unloading mechanisms. This causes the workpiece to easily shift during the welding process, seriously affecting the welding quality.

[0004] Therefore, how to design a spot welding machine for baking racks that can automatically position, weld, and eject the baking rack body has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a grill spot welding machine and spot welding method, which has the advantages of high automation, accurate positioning, high welding efficiency and automatic ejection, and solves the problems in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A grill spot welding machine is used to spot weld a grill body. The grill body includes a grill top frame, a first fixed column and a second fixed column fixed to the lower end of the grill top frame, an inner frame fixed to the upper end of the first fixed column and the second fixed column, and multiple support legs fixed to the lower end of the inner frame. It also includes a base plate, a support block and a fixed frame fixed to the upper end of the base plate, a controller fixed to the side wall of the support block, a moving component disposed above the base plate, a transverse feeding mechanism fixed to the upper end of the base plate, a lateral pressing mechanism fixed to the side wall of the support block, and a component disposed on the fixed frame. The welding torch lifting mechanism, the workpiece lifting mechanism mounted on the transverse feed mechanism, the workpiece positioning mechanism mounted on the moving component, and the elastic ejection mechanism are included. The moving component includes a rodless cylinder fixed to the upper end of the base plate, a connecting block fixed to the moving end of the rodless cylinder, and a moving block fixed to the upper end of the connecting block. The elastic ejection mechanism is provided with a cross-shaped limiting structure formed by four second limiting posts. The controller is electrically connected to the transverse feed mechanism, the lateral clamping mechanism, the moving component, the welding torch lifting mechanism, the workpiece lifting mechanism, and the workpiece positioning mechanism.

[0007] Preferably, the welding torch lifting mechanism includes a first electric cylinder fixed to the side wall of the fixed frame, a connecting rod fixed to the output shaft end of the first electric cylinder, a fixed block fixed to the end of the connecting rod away from the first electric cylinder, a second electric cylinder fixed to the upper end of the fixed block, a welding torch fixed to the lower end of the output shaft of the second electric cylinder, a welding head disposed at the lower end of the welding torch, a horizontal block fixed to the side wall of the fixed block, and a camera fixed to the lower end of the horizontal block; the output shaft of the second electric cylinder passes downward through the fixed block.

[0008] It is worth noting that the welding torch lifting mechanism adopts a dual-stage electric cylinder combination drive. The first electric cylinder realizes the horizontal feeding and the second electric cylinder realizes the vertical pressure welding, which makes the welding torch action respond quickly and meet the motion accuracy requirements of automated welding. The camera can perform visual-assisted positioning and detection of the welding point.

[0009] Preferably, two first guide blocks are fixedly connected to the upper end of the base plate; the lateral feeding mechanism includes a third electric cylinder fixedly connected to the upper end of the base plate, a first limiting block fixedly connected to the output shaft end of the third electric cylinder, a first U-shaped block fixedly connected to the lower end of the first limiting block, and a plurality of first rollers rotatably mounted on the inner walls of both sides of the first U-shaped block; the ends of the two first guide blocks that are close to each other are respectively in contact with the two sides of the first rollers; the lateral pressing mechanism includes a fourth electric cylinder fixedly connected to the side wall of the support block and a first limiting post fixedly connected to the output shaft end of the fourth electric cylinder.

[0010] It is worth noting that the precise guidance of the lateral feeding mechanism is achieved through the limiting cooperation between the first roller and the first guide block, resulting in a compact structure and smooth operation. The lateral clamping mechanism uses the fourth electric cylinder to drive the first limit post to brake and limit the lateral displacement of the moving component, effectively preventing horizontal displacement during welding.

[0011] Preferably, two second guide blocks are fixedly connected to the upper end of the base plate; a second U-shaped block is fixedly connected to the lower end of the moving block, and multiple second rollers are rotatably installed on the inner walls of both sides of the second U-shaped block; the ends of the two second guide blocks that are close to each other are respectively in contact with the two sides of the second rollers; the workpiece positioning mechanism includes two motors fixedly connected to the side wall of the moving block, a fourth limiting block fixedly connected to the output shaft of the two motors and passing through the moving block, a fifth limiting block fixedly connected to the ends of the two fourth limiting blocks that are far apart from each other, a sixth limiting block and a seventh limiting block fixedly connected to the upper end of each fourth limiting block, and a second limiting block and a third limiting block fixedly connected to the upper end of the moving block; there is a first gap between the sixth limiting block and the seventh limiting block, and a second gap between the second limiting block and the third limiting block.

[0012] It is worth noting that the moving component uses a rodless cylinder to achieve long-distance translation of the grill body above the base plate, and with the guidance of the second roller and the second guide block, the smoothness of the movement is ensured; the workpiece positioning mechanism drives the fourth limit block to rotate through a motor, which can drive the inner frame of the grill body to rotate to adjust the angle of the support leg to be welded, thus realizing multi-angle and multi-station welding.

[0013] Preferably, the workpiece lifting mechanism includes a groove extending through the side wall of the first limiting block, a fifth electric cylinder fixed to the top surface of the inner wall of the groove, and a lifting block fixed to the lower end of the output shaft of the fifth electric cylinder; the two sides of the lifting block slide against the two sides of the inner wall of the groove respectively.

[0014] It is worth noting that the workpiece lifting mechanism and the transverse feeding mechanism share the first limit block as the installation base, which is compact and highly integrated. When the fifth electric cylinder drives the lifting block to move upward along the groove, it can directly and smoothly lift the baking rack body located on the moving block, realizing automatic demolding and unloading of finished products, replacing manual handling.

[0015] Preferably, the elastic ejection mechanism includes a central column fixed to the side wall of the movable block, a spring fixed to the upper end of the central column, an ejection ring fixed to the upper end of the spring, and four second limiting columns fixed to the upper end of the central column; the four second limiting columns have gaps between each other and form a cross-shaped limiting structure, and the ejection ring is sleeved on the outer peripheral wall of the central column.

[0016] It is worth noting that the cross-shaped gap formed by the four second limiting posts of the elastic ejection mechanism is precisely matched with the cross-shaped intersection of the first and second fixed posts of the baking rack body, achieving precise centering of the baking rack body; the ejection ring is sleeved on the outer peripheral wall of the central post, providing upward elastic force under the action of the spring, assisting the lifting mechanism to quickly demold.

[0017] Preferably, a first U-shaped seat is fixedly connected to the side wall of the ejector ring, and a first guide wheel is rotatably installed on the inner walls of both sides of the first U-shaped seat; a second U-shaped seat is fixedly connected to the lower part of the side wall of the center column, and a second guide wheel is rotatably installed on the inner walls of both sides of the second U-shaped seat, with the first U-shaped seat and the second U-shaped seat corresponding to each other in the vertical direction; a first steel wire rope is fixedly connected to the first guide wheel, the first steel wire rope passes downward through the second guide wheel and is fixedly connected to one end of the second steel wire rope, and the other end of the second steel wire rope is fixedly connected to a pull ring; a sixth electric cylinder is fixedly connected to the side wall of the first limiting block, a lifting block is fixedly connected to the lower end of the output shaft of the sixth electric cylinder, an L-shaped groove is opened at the upper end of the lifting block, a screw hole is opened through the side wall of the lifting block, a bolt is threaded on the inner wall of the screw hole, the bolt passes through the screw hole and extends into the L-shaped groove; a third U-shaped seat is fixedly connected to the end of the first U-shaped block near the support block, a third guide wheel is rotatably installed on the third U-shaped seat, and a second steel wire rope passes through the third guide wheel.

[0018] It is worth noting that a purely mechanical locking and releasing mechanism for the pull ring is achieved through the cooperation of the pull ring, wire rope, guide wheel, and sixth electric cylinder. When the sixth electric cylinder drives the lifting block to move downward, the pull ring can be engaged in the L-shaped groove and locked with bolts, thereby pulling the wire rope to compress the spring of the ejector ring and sink it, solving the problem of the ejector ring obstructing the placement of the workpiece during loading; the structure is simple, the operation is convenient, and the mechanical linkage can be completed without complex electrical control.

[0019] Preferably, the grill body also includes a U-shaped rod fixed between the top frame and the inner frame of the grill; the first fixing post and the second fixing post are arranged in a cross shape, and the inner frame is located within the area enclosed by the top frame of the grill.

[0020] It is worth noting that the U-shaped bar provides additional strength support for the grill body, making it less prone to deformation during welding and ejection, thus ensuring the final quality of the product; the cross structure ensures the stress balance of the grill body.

[0021] Preferably, the top frame of the grill is simultaneously embedded in the second gap between the second and third limiting blocks, and in the first gap between the sixth and seventh limiting blocks; the inner frame is embedded in the cross-shaped limiting structure formed by the four second limiting posts.

[0022] It is worth noting that this technical solution creates a multi-level nested limiting space by simultaneously nesting the top frame of the grill in two orthogonal directions and combining it with the "three-point positioning" of the cross-shaped limiting structure embedded in the inner frame. This eliminates the degree of freedom of the grill body in the horizontal and rotational directions, making the welding process stable and reliable throughout.

[0023] The present invention also provides a grill spot welding method for a grill spot welding machine, which includes the following steps: Step 1: Place the grill body on the moving block, so that the top frame of the grill is simultaneously embedded in the first gap and the second gap, and the cross-shaped intersection of the first fixed post and the second fixed post is embedded in the cross-shaped limiting structure formed by the four second limiting posts. Step 2: Start the motor to drive the fourth limit block to rotate, which in turn drives the inner frame to rotate, so that the position of the upper support leg of the inner frame to be welded is directly aligned with the welding head. Step 3: Start the first and second electric cylinders, and drive the welding head down to the welding position through the linkage welding gun lifting mechanism. Perform spot welding operations on the connection between the four legs and the inner frame in sequence. Step 4: After spot welding is completed, start the fifth electric cylinder to drive the lifting block to move upward, push the welded grill body off the moving block and reset it.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention achieves multi-point synchronous positioning of the top frame and inner frame of the baking rack by setting up a workpiece positioning mechanism driven by a motor, in conjunction with a double-layer frame limiting structure formed by the second limiting block, the third limiting block, the sixth limiting block and the seventh limiting block, and a cross-shaped limiting structure formed by four second limiting posts. This solves the problems of simple positioning and easy deflection and shaking of existing welding fixtures, and significantly improves the clamping accuracy and the consistency of the welding point position. 2. This invention drives the fourth limiting block to rotate via a motor, causing the inner frame and support legs to automatically rotate and shift around a fixed axis, so that the welding positions of each support leg are aligned with the welding head in sequence. This solves the problem that existing welding methods require manual movement or flipping of the baking rack to switch the welding point positions, greatly reducing manual intervention and improving welding efficiency. 3. By setting up a workpiece lifting mechanism consisting of a fifth electric cylinder and a lifting block, and with the auxiliary elastic force provided by the spring-supported ejection ring, the present invention can automatically eject the baking rack body from the moving block after welding, which solves the problem of workpiece jamming and difficulty in removal after welding in existing equipment, requiring manual prying to remove the material, and realizes fast and non-destructive unloading, which not only protects the surface quality of the workpiece, but also extends the service life of the fixture. 4. By setting up a welding torch lifting mechanism consisting of a first electric cylinder, a second electric cylinder, and a camera, the present invention achieves precise movement and visual-assisted positioning of the welding head in a two-dimensional plane, solving the problem of existing welding methods relying on manual visual alignment and large deviations in weld point positions, and ensuring the consistency of weld point quality and appearance quality during batch welding. 5. This invention achieves automated and coordinated operation of the entire process of workpiece feeding, positioning, displacement, welding, lifting and unloading by centrally controlling and linking various electric cylinders, motors and rodless cylinders through the controller. It solves the problems of independent operation of each process, poor connection and low production efficiency of existing equipment, and significantly improves the operation efficiency and automation level of mass production. 6. By setting up a lateral clamping mechanism consisting of a fourth electric cylinder and a first limiting post, the present invention applies a lateral clamping force to the workpiece on the moving block during the welding process, effectively suppressing the horizontal movement of the workpiece that may occur during welding, and further improving the stability of the weld point position and the welding quality. 7. The present invention converts the sliding friction between the moving components into rolling friction through the rolling engagement of the first roller and the first guide block in the first U-shaped block, and the rolling engagement of the second roller and the second guide block in the second U-shaped block. This not only ensures the linear feed accuracy of the moving parts, but also reduces the motion resistance and component wear, and extends the service life of the equipment. Attached Figure Description

[0025] Figure 1 The diagram shown is a three-dimensional structural schematic of the present invention; Figure 2 The diagram shown is a three-dimensional structural schematic of the welding torch lifting mechanism of the present invention. Figure 3 The diagram shown is a three-dimensional structural schematic of the lateral clamping mechanism of the present invention; Figure 4 The diagram shown is a three-dimensional structural schematic of the moving component and workpiece positioning mechanism of the present invention. Figure 5 The diagram shown is a three-dimensional structural schematic of the second guide block of the present invention; Figure 6 The diagram shown is a three-dimensional structural schematic of the workpiece lifting mechanism of the present invention; Figure 7 The diagram shown is a three-dimensional structural schematic of the elastic ejection mechanism of the present invention. Figure 8 The diagram shown is a three-dimensional structural schematic of the ejector ring of the present invention; Figure 9 The diagram shown is a three-dimensional structural schematic of the first limiting block of the present invention; Figure 10 The present invention is shown Figure 9 A magnified three-dimensional structural diagram of point A in the diagram; Figure 11 The diagram shown is a three-dimensional structural schematic of the grill body of the present invention.

[0026] Reference numerals: 1. Base plate; 2. Support block; 3. Controller; 4. Fixing frame; 5. First electric cylinder; 6. Connecting rod; 7. Fixing block; 8. Second electric cylinder; 9. Welding torch; 10. Welding head; 11. Horizontal block; 12. Camera; 13. First guide block; 14. Third electric cylinder; 15. First limiting block; 16. First U-shaped block; 17. First roller; 18. Second guide block; 181. Second U-shaped block; 182. Second roller; 19. Fourth electric cylinder; 20. First limiting post; 21. Rodless cylinder; 22. Connecting block; 23. Moving block; 24. Motor; 25. Second limiting block; 26. Third limiting block; 27. Fourth limiting block; 28. 29. Fifth limiting block; 30. Sixth limiting block; 31. Seventh limiting block; 32. Groove; 33. Fifth electric cylinder; 34. Lifting block; 35. Central column; 36. Spring; 37. Ejection ring; 38. Second limiting column; 39. First U-shaped seat; 40. First guide wheel; 41. Second U-shaped seat; 42. Second guide wheel; 43. First wire rope; 44. Sixth electric cylinder; 45. Lifting block; 46. L-shaped groove; 47. Screw hole; 48. Bolt; 49. Third U-shaped seat; 50. Third guide wheel; 51. Second wire rope; 52. Pull ring; 53. Grill top frame; 54. First fixing column; 55. Second fixing column; 56. Inner frame; 57. U-shaped rod; 58. Support leg. Detailed Implementation

[0027] 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.

[0028] To address the problems of difficult positioning, low welding efficiency, and cumbersome manual handling during grill body welding in existing technologies, the following technical solution is proposed. Please refer to [link / reference needed]. Figures 1-11 ; A grill spot welding machine is used to spot weld a grill body, the grill body including a grill top frame 52, a first fixed post 53 and a second fixed post 54 fixed to the lower end of the grill top frame 52, an inner frame 55 fixed to the upper end of the first fixed post 53 and the second fixed post 54, and a plurality of support legs 57 fixed to the lower end of the inner frame 55.

[0029] In this embodiment, specifically, the grill spot welding machine includes a base plate 1, a support block 2 and a fixed frame 4 fixed to the upper end of the base plate 1, a controller 3 fixed to the side wall of the support block 2, a moving component disposed above the base plate 1, a transverse feeding mechanism fixed to the upper end of the base plate 1, a lateral pressing mechanism fixed to the side wall of the support block 2, a welding gun lifting mechanism disposed on the fixed frame 4, a workpiece lifting mechanism disposed on the transverse feeding mechanism, a workpiece positioning mechanism disposed on the moving component, and an elastic ejection mechanism; the moving component includes a rodless cylinder 21 fixed to the upper end of the base plate 1, a connecting block 22 fixed to the moving end of the rodless cylinder 21, and a moving block 23 fixed to the upper end of the connecting block 22; the elastic ejection mechanism is provided with a cross-shaped limiting structure formed by four second limiting posts 37; the controller 3 is electrically connected to the transverse feeding mechanism, the lateral pressing mechanism, the moving component, the welding gun lifting mechanism, the workpiece lifting mechanism, and the workpiece positioning mechanism respectively.

[0030] In this embodiment, specifically, the welding torch lifting mechanism includes a first electric cylinder 5 fixed to the side wall of the fixed frame 4, a connecting rod 6 fixed to the output shaft end of the first electric cylinder 5, a fixed block 7 fixed to the end of the connecting rod 6 away from the first electric cylinder 5, a second electric cylinder 8 fixed to the upper end of the fixed block 7, a welding torch 9 fixed to the lower end of the output shaft of the second electric cylinder 8, a welding head 10 disposed at the lower end of the welding torch 9, a horizontal block 11 fixed to the side wall of the fixed block 7, and a camera 12 fixed to the lower end of the horizontal block 11; the output shaft of the second electric cylinder 8 passes downward through the fixed block 7.

[0031] In this embodiment, specifically, two first guide blocks 13 are fixedly connected to the upper end of the base plate 1; the transverse feeding mechanism includes a third electric cylinder 14 fixedly connected to the upper end of the base plate 1, a first limiting block 15 fixedly connected to the output shaft end of the third electric cylinder 14, a first U-shaped block 16 fixedly connected to the lower end of the first limiting block 15, and a plurality of first rollers 17 rotatably mounted on the inner walls of both sides of the first U-shaped block 16; the ends of the two first guide blocks 13 that are close to each other are respectively attached to the two sides of the first rollers 17; the lateral pressing mechanism includes a fourth electric cylinder 19 fixedly connected to the side wall of the support block 2 and a first limiting post 20 fixedly connected to the output shaft end of the fourth electric cylinder 19.

[0032] In this embodiment, specifically, two second guide blocks 18 are fixedly connected to the upper end of the base plate 1; a second U-shaped block 181 is fixedly connected to the lower end of the moving block 23, and multiple second rollers 182 are rotatably installed on the inner walls of both sides of the second U-shaped block 181. The ends of the two second guide blocks 18 that are close to each other are respectively in contact with the two sides of the second rollers 182; the workpiece positioning mechanism includes two motors 24 fixedly connected to the side wall of the moving block 23, a fourth limiting block 27 fixedly connected to the output shaft of the two motors 24 and passing through the moving block 23, a fifth limiting block 28 fixedly connected to the ends of the two fourth limiting blocks 27 that are far apart from each other, a sixth limiting block 29 and a seventh limiting block 30 fixedly connected to the upper end of each fourth limiting block 27, and a second limiting block 25 and a third limiting block 26 fixedly connected to the upper end of the moving block 23; there is a first gap between the sixth limiting block 29 and the seventh limiting block 30, and a second gap between the second limiting block 25 and the third limiting block 26.

[0033] In this embodiment, specifically, the workpiece lifting mechanism includes a groove 31 that passes through the side wall of the first limiting block 15, a fifth electric cylinder 32 fixed to the top surface of the inner wall of the groove 31, and a lifting block 33 fixed to the lower end of the output shaft of the fifth electric cylinder 32; the two sides of the lifting block 33 are respectively attached to and slide against the two sides of the inner wall of the groove 31.

[0034] In this embodiment, specifically, the elastic ejection mechanism includes a central column 34 fixed to the side wall of the movable block 23, a spring 35 fixed to the upper end of the central column 34, an ejection ring 36 fixed to the upper end of the spring 35, and four second limiting columns 37 fixed to the upper end of the central column 34; the four second limiting columns 37 have gaps between each other and form a cross-shaped limiting structure, and the ejection ring 36 is sleeved on the outer peripheral wall of the central column 34.

[0035] In this embodiment, specifically, a first U-shaped seat 38 is fixedly connected to the side wall of the ejector ring 36, and first guide wheels 39 are rotatably mounted on the inner walls of both sides of the first U-shaped seat 38; a second U-shaped seat 40 is fixedly connected to the lower part of the side wall of the center column 34, and second guide wheels 41 are rotatably mounted on the inner walls of both sides of the second U-shaped seat 40, with the first U-shaped seat 38 and the second U-shaped seat 40 corresponding to each other in the vertical direction; a first steel wire rope 42 is fixedly connected to the first guide wheel 39, the first steel wire rope 42 passes downward through the second guide wheel 41 and is fixedly connected to one end of the second steel wire rope 50, and the other end of the second steel wire rope 50 is fixedly connected to... A pull ring 51 is attached; a sixth electric cylinder 43 is fixedly connected to the side wall of the first limiting block 15, and a lifting block 44 is fixedly connected to the lower end of the output shaft of the sixth electric cylinder 43. An L-shaped groove 45 is opened at the upper end of the lifting block 44, and a screw hole 46 is opened through the side wall of the lifting block 44. A bolt 47 is threaded on the inner wall of the screw hole 46, and the bolt 47 passes through the screw hole 46 and extends into the L-shaped groove 45; a third U-shaped seat 48 is fixedly connected to one end of the first U-shaped block 16 near the support block 2, and a third guide wheel 49 is rotatably installed on the third U-shaped seat 48. A second steel wire rope 50 passes through the third guide wheel 49.

[0036] In this embodiment, specifically, the grill body also includes a U-shaped rod 56 fixed between the top frame 52 and the inner frame 55 of the grill; the first fixing post 53 and the second fixing post 54 are arranged in a cross shape, and the inner frame 55 is located in the area enclosed by the top frame 52 of the grill.

[0037] In this embodiment, specifically, the top frame 52 of the grill is simultaneously embedded in the second gap between the second limiting block 25 and the third limiting block 26, and in the first gap between the sixth limiting block 29 and the seventh limiting block 30; the inner frame 55 is embedded in the cross-shaped limiting structure formed by the four second limiting posts 37.

[0038] The present invention also provides a grill spot welding method for a grill spot welding machine, which includes the following steps: Step 1: Place the grill body on the moving block 23, so that the top frame 52 of the grill is simultaneously embedded in the first gap and the second gap, and the cross-shaped intersection of the first fixing post 53 and the second fixing post 54 is embedded in the cross-shaped limiting structure formed by the four second limiting posts 37. Step 2: Start motor 24 to drive the fourth limit block 27 to rotate, which in turn drives the inner frame 55 to rotate, so that the position of the upper support leg 57 of the inner frame 55 to be welded is directly aligned with the welding head 10. Step 3: Start the first electric cylinder 5 and the second electric cylinder 8, and drive the welding head 10 to move down to the welding position through the linkage welding gun lifting mechanism. Perform spot welding operations on the connection between the four legs 57 and the inner frame 55 in sequence. Step 4: After spot welding is completed, start the fifth electric cylinder 32 to drive the lifting block 33 to move upward, push the welded baking rack body off the moving block 23 and reset it.

[0039] Working principle: In use, the operator first sets the working parameters through the controller 3, and the device enters the standby state. During the workpiece clamping stage, the operator or the external feeding mechanism first places the support legs 57 to be welded on the upper end of the moving block 23, the upper end of the two fourth limit blocks 27, and the upper end of the first limit block 15, respectively. Among them, the fifth limit blocks 28 fixed to both ends of each fourth limit block 27 laterally limit the support legs 57 placed on the upper end and sides of the fourth limit blocks 27 to prevent the support legs 57 from shifting or falling off in subsequent operations. Then, the controller 3 starts the fourth electric cylinder 19, which drives the first limit column 20 to extend inward and further laterally press and limit the support legs 57 placed on the upper end of the moving block 23 to ensure that all support legs 57 are in the preset welding corresponding position before the grill body is installed. After the outrigger 57 is pre-placed, the operator manually pulls the pull ring 51. Through the linkage of the second wire rope 50 and the first wire rope 42, the spring force of the spring 35 is overcome and the ejector ring 36 is pulled down, so that the four second limit posts 37 are fully exposed. The pull ring 51 is inserted into the L-shaped groove 45 at the upper end of the lifting block 44, and the bolt 47 is tightened to press the pull ring 51, so that the ejector ring 36 is kept in the downward state. The operator can then use both hands to clamp the grill body. The operator places the grill body on the moving block 23, so that the top frame 52 of the grill body is simultaneously embedded in the second gap between the second limiting block 25 and the third limiting block 26, and in the first gap between the sixth limiting block 29 and the seventh limiting block 30. The inner frame 55 is embedded in the cross-shaped limiting structure formed by the four second limiting posts 37. The cross-shaped intersection of the first fixing post 53 and the second fixing post 54 is precisely matched with the cross-shaped limiting structure. After clamping, the bolt 47 is loosened, and the ejector ring 36 is reset under the action of the spring 35. At this time, the lower end face of the inner frame 55 of the grill body is aligned with the upper end face of each pre-placed support leg 57. The controller 3 starts the rodless cylinder 21, which drives the moving block 23 to slide along the second guide block 18 through the connecting block 22, and transports the clamped baking rack body and the support leg 57 to the welding station together. During the welding process, the motor 24 drives the fourth limiting block 27 to rotate, which in turn drives the inner frame 55 and the limited support legs 57 to rotate around the central axis of the inner frame 55, so that the welding positions of the connection between each support leg 57 and the inner frame 55 are aligned vertically with the welding head 10. The first electric cylinder 5 drives the connecting rod 6 and the fixing block 7 to move horizontally, and the second electric cylinder 8 drives the welding gun 9 and the welding head 10 to move vertically. The camera 12 collects the image information of the welding point area in real time and feeds it back to the controller 3 for visual auxiliary positioning. The welding gun 9 performs spot welding operations on the connection between the four support legs 57 and the inner frame 55 in sequence. After spot welding is completed, the third electric cylinder 14 drives the first limiting block 15 to move along the first guide block 13 to the bottom of the grill body, and the fifth electric cylinder 32 drives the lifting block 33 to extend upward along the groove 31, lifting the welded grill body from below. The reset force of the spring 35 helps to pop the workpiece upward, so that the grill body is separated from the limiting structure on the moving block 23. The operator or external material handling mechanism takes away the finished grill, and all mechanisms reset and enter the next work cycle.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A grill spot welding machine for spot welding a grill body, the grill body comprising a grill top frame (52), a first fixed post (53) and a second fixed post (54) fixed to the lower end of the grill top frame (52), an inner frame (55) fixed to the upper end of the first fixed post (53) and the second fixed post (54), and a plurality of support legs (57) fixed to the lower end of the inner frame (55), characterized in that, The system includes a base plate (1), a support block (2) and a fixed frame (4) fixed to the upper end of the base plate (1), a controller (3) fixed to the side wall of the support block (2), a moving component set above the base plate (1), a transverse feed mechanism fixed to the upper end of the base plate (1), a lateral clamping mechanism fixed to the side wall of the support block (2), a welding torch lifting mechanism set on the fixed frame (4), a workpiece lifting mechanism set on the transverse feed mechanism, a workpiece positioning mechanism set on the moving component, and an elastic ejection mechanism; the moving component includes a rodless cylinder (21) fixed to the upper end of the base plate (1), a connecting block (22) fixed to the moving end of the rodless cylinder (21), and a moving block (23) fixed to the upper end of the connecting block (22); the elastic ejection mechanism is provided with a cross-shaped limiting structure formed by four second limiting posts (37); the controller (3) is electrically connected to the transverse feed mechanism, the lateral clamping mechanism, the moving component, the welding torch lifting mechanism, the workpiece lifting mechanism, and the workpiece positioning mechanism respectively.

2. The grill spot welding machine according to claim 1, characterized in that, The welding torch lifting mechanism includes a first electric cylinder (5) fixed to the side wall of the fixed frame (4), a connecting rod (6) fixed to the output shaft end of the first electric cylinder (5), a fixed block (7) fixed to the end of the connecting rod (6) away from the first electric cylinder (5), a second electric cylinder (8) fixed to the upper end of the fixed block (7), a welding torch (9) fixed to the lower end of the output shaft of the second electric cylinder (8), a welding head (10) set at the lower end of the welding torch (9), a horizontal block (11) fixed to the side wall of the fixed block (7), and a camera (12) fixed to the lower end of the horizontal block (11); the output shaft of the second electric cylinder (8) passes downward through the fixed block (7).

3. The grill spot welding machine according to claim 1, characterized in that, Two first guide blocks (13) are fixed to the upper end of the base plate (1); the transverse feeding mechanism includes a third electric cylinder (14) fixed to the upper end of the base plate (1), a first limiting block (15) fixed to the output shaft end of the third electric cylinder (14), a first U-shaped block (16) fixed to the lower end of the first limiting block (15), and multiple first rollers (17) rotatably mounted on the inner walls of both sides of the first U-shaped block (16); the two first guide blocks (13) are close to each other at one end and respectively fit against the two sides of the first rollers (17); the lateral pressing mechanism includes a fourth electric cylinder (19) fixed to the side wall of the support block (2) and a first limiting post (20) fixed to the output shaft end of the fourth electric cylinder (19).

4. The grill spot welding machine according to claim 1, characterized in that, Two second guide blocks (18) are fixedly connected to the upper end of the base plate (1); a second U-shaped block (181) is fixedly connected to the lower end of the moving block (23), and multiple second rollers (182) are rotatably installed on the inner walls of both sides of the second U-shaped block (181). The ends of the two second guide blocks (18) that are close to each other are respectively in contact with the two sides of the second rollers (182); the workpiece positioning mechanism includes two motors (24) fixedly connected to the side wall of the moving block (23), and the output shafts of the two motors (24) fixedly connected to and passing through the moving block (23). The fourth limiting block (27), the fifth limiting block (28) fixed to one end of the two fourth limiting blocks (27) away from each other, the sixth limiting block (29) and the seventh limiting block (30) fixed to the upper end of each fourth limiting block (27), and the second limiting block (25) and the third limiting block (26) fixed to the upper end of the moving block (23); there is a first gap between the sixth limiting block (29) and the seventh limiting block (30), and a second gap between the second limiting block (25) and the third limiting block (26).

5. A grill spot welding machine according to claim 3, characterized in that, The workpiece lifting mechanism includes a groove (31) that runs through the side wall of the first limiting block (15), a fifth electric cylinder (32) fixed to the top surface of the inner wall of the groove (31), and a lifting block (33) fixed to the lower end of the output shaft of the fifth electric cylinder (32); the two sides of the lifting block (33) are respectively in contact with and slide against the two sides of the inner wall of the groove (31).

6. The grill spot welding machine according to claim 1, characterized in that, The elastic ejection mechanism includes a central column (34) fixed to the side wall of the moving block (23), a spring (35) fixed to the upper end of the central column (34), an ejection ring (36) fixed to the upper end of the spring (35), and four second limiting columns (37) fixed to the upper end of the central column (34); the four second limiting columns (37) have gaps between each other and form a cross-shaped limiting structure, and the ejection ring (36) is sleeved on the outer peripheral wall of the central column (34).

7. A grill spot welding machine according to claim 6, characterized in that, A first U-shaped seat (38) is fixedly connected to the side wall of the ejector ring (36), and a first guide wheel (39) is rotatably installed on the inner walls of both sides of the first U-shaped seat (38); a second U-shaped seat (40) is fixedly connected to the lower part of the side wall of the center column (34), and a second guide wheel (41) is rotatably installed on the inner walls of both sides of the second U-shaped seat (40), and the first U-shaped seat (38) and the second U-shaped seat (40) are vertically aligned; a first steel wire rope (42) is fixedly connected to the first guide wheel (39), the first steel wire rope (42) passes downward through the second guide wheel (41) and is fixedly connected to one end of the second steel wire rope (50), and a pull ring (51) is fixedly connected to the other end of the second steel wire rope (50); A sixth electric cylinder (43) is fixedly connected to the side wall of a limiting block (15). A lifting block (44) is fixedly connected to the lower end of the output shaft of the sixth electric cylinder (43). An L-shaped groove (45) is opened at the upper end of the lifting block (44). A screw hole (46) is opened through the side wall of the lifting block (44). A bolt (47) is threaded on the inner wall of the screw hole (46). The bolt (47) passes through the screw hole (46) and extends into the L-shaped groove (45). A third U-shaped seat (48) is fixedly connected to the end of the first U-shaped block (16) near the support block (2). A third guide wheel (49) is rotatably installed on the third U-shaped seat (48). A second steel wire rope (50) passes through the third guide wheel (49).

8. A grill spot welding machine according to claim 1, characterized in that, The grill body also includes a U-shaped rod (56) fixed between the top frame (52) and the inner frame (55); the first fixing post (53) and the second fixing post (54) are arranged in a cross shape, and the inner frame (55) is located in the area enclosed by the top frame (52).

9. A grill spot welding machine according to claim 1, characterized in that, The top frame (52) of the grill is simultaneously embedded in the second gap between the second limiting block (25) and the third limiting block (26), and in the first gap between the sixth limiting block (29) and the seventh limiting block (30); the inner frame (55) is embedded in the cross-shaped limiting structure formed by the four second limiting posts (37).

10. A grill spot welding method based on the grill spot welding machine according to any one of claims 1 to 9, characterized in that, Includes the following steps: Step 1: Place the grill body on the moving block (23) so that the top frame (52) of the grill is simultaneously embedded in the first gap and the second gap, and the cross-shaped intersection of the first fixed post (53) and the second fixed post (54) is embedded in the cross-shaped limiting structure formed by the four second limiting posts (37). Step 2: Start the motor (24) to drive the fourth limit block (27) to rotate, which in turn drives the inner frame (55) to rotate, so that the welding position of the upper support leg (57) of the inner frame (55) is directly aligned with the welding head (10); Step 3: Start the first electric cylinder (5) and the second electric cylinder (8), and drive the welding head (10) to move down to the welding position through the linkage welding gun lifting mechanism. Perform spot welding operations on the connection between the four legs (57) and the inner frame (55) in sequence. Step 4: After spot welding is completed, start the fifth electric cylinder (32) to drive the lifting block (33) to move upward, push the welded grill body off the moving block (23) and reset it.

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