An automotive aftertreatment assembly arc welding apparatus and method

Abstract

The application relates to the technical field of automobile mechanical machining and welding equipment, in particular to an automobile aftertreatment device assembly electric arc welding device and method, which comprises a base, a bearing assembly for supporting a workpiece is arranged on the base, a driving assembly for placing a welding clamp is arranged on one side of the bearing assembly, a linkage assembly is arranged at the side end of the driving assembly, an adapter assembly is arranged on the side close to the bearing assembly of the linkage assembly, the adapter assembly can drive the bearing assembly to rotate and weld the workpiece, and can consume the rotational inertia of the workpiece under the action of the linkage assembly. Through the work of the linkage assembly and the adapter assembly, the application can realize accurate alignment, strong welding stability, meet continuous welding operation, and avoid the problems of insufficient welding quality and low practicability.

Description

Technical Field

[0001] This invention relates to the field of automotive machining and welding equipment technology, specifically to an arc welding device and method for automotive after-processor assemblies. Background Technology

[0002] Circumferential welding is a common processing procedure in the automotive machining field. For circumferential welding of circumferential workpieces, the industry currently generally uses manual hand-held welding clamps or simple auxiliary welding equipment to complete the processing.

[0003] In existing technologies, purely manual welding requires extremely high operator skill. When manually holding a welding torch and welding around the circumference of the workpiece, it is difficult to maintain a constant welding torch posture, welding wire spacing, and walking speed. This easily leads to welding defects such as uneven weld width, weld beads, incomplete welds, and missed welds, resulting in poor weld quality and low product qualification rate. At the same time, existing welding auxiliary equipment can only assist the workpiece in rotating. During each welding alignment process, the workpiece cannot be started and stopped in time, which can easily cause scratches at the weld end and lead to subsequent welding alignment deviations. It is impossible to achieve continuous and stable welding operations, resulting in low practicality. There is an urgent need for a device that can accurately align, has strong welding stability, and can meet the requirements of continuous welding operations to avoid insufficient welding quality and low practicality. Summary of the Invention

[0004] The purpose of this invention is to provide an arc welding apparatus and method for automotive aftertreatment assemblies to solve the problems mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: An arc welding apparatus for automotive aftertreatment assemblies includes a base, on which a support component for supporting a workpiece is provided. A drive component for placing welding clamps is provided on one side of the support component. A linkage component is provided on the side end of the drive component. A connecting component is provided on the side of the linkage component near the support component. The connecting component can drive the support component to rotate the workpiece for welding and can dissipate the rotational inertia of the workpiece under the action of the linkage component.

[0005] Preferably, the bearing assembly includes a bearing base, which is slidably disposed on a base. The bearing base is provided with support rollers capable of supporting the workpiece. The support rollers are rotatably disposed on the bearing base via a drive shaft. The bearing base is symmetrically provided with limiting seats for fixing the ends of the workpiece on both sides. The bottom of the limiting seat is slidably engaged with the bearing base. The side end of the limiting seat is provided with a rotating disk for fixing the ends of the workpiece.

[0006] Preferably, the drive assembly includes drive frames symmetrically arranged on the side of the support base, the bottom of the drive frames being slidably disposed in a sliding track on the base, an adjustment shaft capable of rotational adjustment being provided between the two drive frames, a welding machine being provided on the adjustment shaft, the welding clamp being mounted on the welding machine, and a hand rest for supporting the arm being connected between the two drive frames.

[0007] Preferably, the linkage assembly includes a drive bevel gear disposed on the side end of the support base. The center of the drive bevel gear is connected to the end of the drive shaft. Vertically arranged fixing frames are provided on both sides of the drive bevel gear. Each fixing frame is provided with a rotating sleeve. A central shaft is rotatably engaged between two rotating sleeves. A tapered member is provided at the adjacent end of each of the two rotating sleeves. The tapered member is sleeved on the outside of the central shaft. A mating bevel gear is sleeved on one of the rotating sleeves. The rotating sleeve closer to the mating bevel gear is rotatably engaged with the fixing frame. The side end of the mating bevel gear meshes with the side end of the drive bevel gear. One end of the central shaft is connected to the output end of the drive motor.

[0008] Preferably, a plurality of sliding blocks are evenly distributed in the middle of the central shaft, and a sliding member is sleeved on the middle of the central shaft. The sliding member is slidably disposed on the plurality of sliding blocks, and both ends of the sliding member are connected to a conical locking sleeve. The conical locking sleeve is slidably disposed on the central shaft and can be sleeved on the outside of the conical member. A plurality of limiting blocks are evenly distributed on the outside of one of the conical members away from the mating bevel gear. The inner side of the conical locking sleeve away from the mating bevel gear has a slot for cooperating with the limiting blocks. Arc-shaped blocks are symmetrically arranged above and below the sliding member. The arc-shaped blocks are rotatably engaged with the sliding member. Two of the arc-shaped blocks are respectively hinged to the two ends of the connecting frame. A connecting rod is provided on the side end of the connecting frame. The middle part of the connecting rod is rotatably connected to the locking shaft on the auxiliary platform through a return coil spring.

[0009] Preferably, the connecting assembly includes an L-shaped frame disposed on the side end of the auxiliary platform. The L-shaped frame is rotatably mounted on a reset shaft at the side end via a coil spring. One end of the L-shaped frame is located on one side of the connecting rod, and an abutment wheel is rotatably disposed on the other end of the L-shaped frame. The auxiliary platform is provided with an infrared sensor capable of controlling the start and stop of the drive motor. When the connecting rod deflects on the locking shaft, the drive motor can be started by controlling the infrared sensor.

[0010] Preferably, a control plate is provided on one side of the L-shaped frame, the bottom of the control plate is connected to the base, and limiting rails are symmetrically provided on both sides of the control plate. Control rods are slidably engaged on the two limiting rails. An L-shaped abutment frame is provided at the bottom of one end of the control rod, and the bottom of the L-shaped abutment frame is located above the abutment wheel. The other end of the control rod is located below the adjusting shaft. The bottom of the control rod is movably connected to the base through a spring telescopic rod. A rotating pressing member is provided on the adjusting shaft. When the adjusting shaft deflects, the rotating pressing member can press against the control plate, causing the control plate to compress the spring telescopic rod.

[0011] Preferably, the method of using the electric arc welding device for automotive aftertreatment assembly includes the following steps:

[0012] S1: The operator places the workpiece to be welded on the support rollers on the support base and clamps it at the end of the workpiece by rotating the disc. By moving the limiting seat, the workpiece is aligned and fixed. Then, by controlling the position of the drive frame in the sliding track, the position of the welding machine is moved so that the hand rests on the hand rest and the welding clamp carrying the welding wire moves towards the welding point of the workpiece, thus facilitating the welding work.

[0013] S2: After moving the wire a corresponding distance according to its length, manually drive the wire to deflect under the action of the adjusting shaft, so that the end of the wire is in contact with the annular weld seam of the workpiece. At this time, the rotating pressing part contacts the upper part of the control rod, causing the control rod to move down along the limit track and compress the spring telescopic rod. Through the cooperation of the L-shaped contact frame and the contact wheel, the L-shaped frame deflects. The L-shaped frame drives the connecting rod to deflect on the clamping shaft. At this time, the infrared sensor controls the drive motor to work, and the central shaft rotates synchronously. Under the action of the sliding block, the sliding part rotates synchronously between the two arc blocks. During the deflection of the connecting rod, the connecting frame and the arc block drive the sliding part to slide through the sliding block, so that the conical clamping sleeve close to the bevel gear is clamped on the outside of the adjacent conical part, and the other conical clamping sleeve is disengaged from the limiting block. Then, under the synchronous action of the rotating sleeve and the conical part, the bevel gear is driven to rotate synchronously, driving the drive bevel gear meshing with it to rotate. The workpiece is rotated through the support roller, and then the welding operation is carried out.

[0014] S3: When the worker moves the welding wire away from the weld seam by adjusting the shaft, the control rod loses its resistance and resets under the action of the spring telescopic rod. The L-shaped frame resets under the action of the coil spring, and the connecting rod synchronously drives the sliding part to reset under the action of the reset coil spring. This causes the conical locking sleeve to lock onto the limiting block through the bayonet, thereby quickly suppressing the workpiece's inertial rotation, reducing the rotational stroke of the workpiece after it is disengaged from the drive, ensuring the welding accuracy of the circumferential weld seam, and accurately continuing the previous welding work when the adjusting shaft is deflected again, thus enabling stable continuous welding operations.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] In this invention, the operator places the workpiece to be welded on the support component, and uses the support component to complete the workpiece positioning and alignment. Then, by controlling the drive component, the welding clamp carrying the welding wire moves towards the welding point of the workpiece. After adjusting to the target position according to the length of the welding wire, it is deflected so that the end of the welding wire is in contact with the circumferential weld of the workpiece. At this time, the linkage component drives the connecting component to work, so that the support component drives the workpiece to rotate to carry out welding. When the operator deflects the welding clamp to move the welding wire away from the weld, the workpiece is quickly constrained, thereby enabling stable continuous welding operations.

[0017] In this invention, the device, through the cooperation of the drive component, linkage component and connecting component, can automatically drive the workpiece to rotate and weld when the welding wire is attached to the circumferential weld, and quickly constrain the workpiece when the welding wire is separated from the weld. It completely solves the problems of weld defects and alignment deviations caused by the workpiece starting and stopping and idling after the traditional equipment, effectively avoids welding defects such as undercut, scratches and uneven finishing, and greatly improves the welding forming accuracy and overall welding quality of the circumferential weld.

[0018] In this invention, the device can precisely control the moving distance and deflection angle of the welding clamp according to the length of the welding wire, ensuring that the end of the welding wire is precisely aligned with the circumferential weld of the workpiece, resulting in high welding alignment accuracy. It eliminates the need for repeated manual calibration and adjustment, reducing reliance on the welding skills of operators, minimizing manual operation errors, simplifying the welding process, and reducing the intensity of manual labor.

[0019] In this invention, the device can realize automated continuous welding operations. The workpiece rotation, start and stop constraints and welding gun welding actions are highly coordinated, the operation is highly continuous, effectively improving the welding processing efficiency of ring-shaped workpieces and further enhancing the practicality of the device. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a partial three-dimensional structural diagram of the present invention. Figure 1 ;

[0022] Figure 3 This is a partial three-dimensional structural diagram of the present invention. Figure 2 ;

[0023] Figure 4 This is a partial three-dimensional structural diagram of the linkage component in this invention;

[0024] Figure 5 This is a schematic diagram of the partially exploded three-dimensional structure of the linkage component in this invention. Figure 1 ;

[0025] Figure 6 This is a schematic diagram of the partially exploded three-dimensional structure of the linkage component in this invention. Figure 2 ;

[0026] Figure 7 This is a schematic diagram of the partially exploded three-dimensional structure of the linkage component in this invention. Figure 3 ;

[0027] Figure 8 This is a partial three-dimensional structural diagram of the present invention. Figure 3 ;

[0028] Figure 9 This is a partial three-dimensional structural diagram of the present invention. Figure 4 .

[0029] In the diagram: 1. Base; 2. Bearing assembly; 21. Bearing base; 22. Support roller; 23. Drive shaft; 24. Limiting seat; 25. Rotating disk; 3. Welding clamp; 4. Drive assembly; 41. Drive frame; 42. Sliding rail; 43. Adjusting shaft; 44. Welding machine; 45. Hand rest; 5. Linkage assembly; 51. Drive bevel gear; 52. Fixed frame; 53. Rotating sleeve; 54. Central shaft; 55. Conical part; 56. Matching bevel gear; 57. Drive motor; 58. 59. Sliding block; 60. Sliding component; 61. Conical locking sleeve; 62. Limiting block; 63. Bayonet; 64. Arc-shaped block; 65. Connecting frame; 66. Connecting rod; 67. Return coil spring; 68. Auxiliary platform; 79. Locking shaft; 70. Connecting assembly; 71. L-shaped frame; 72. Return shaft; 73. Abutment wheel; 74. Infrared sensor; 75. Control board; 76. Limit track; 77. Control rod; 78. L-shaped abutment frame; 79. Spring telescopic rod; 80. Rotating pressing component. Detailed Implementation

[0030] 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.

[0031] Please see Figures 1 to 9 The present invention provides a technical solution: an arc welding device for automotive after-processor assembly, including a base 1, a bearing component 2 for supporting the workpiece on the base 1, a driving component 4 for placing welding clamps 3 on one side of the bearing component 2, a linkage component 5 on the side end of the driving component 4, and a connecting component 7 on the side of the linkage component 5 near the bearing component 2. The connecting component 7 can drive the bearing component 2 to rotate the workpiece for welding, and can consume the rotational inertia of the workpiece under the action of the linkage component 5.

[0032] In this embodiment, as Figures 1 to 3 As shown, the bearing assembly 2 includes a bearing base 21, which is slidably mounted on the base 1. The bearing base 21 is provided with support rollers 22 that can support the workpiece. The support rollers 22 are rotatably mounted on the bearing base 21 via a drive shaft 23. The bearing base 21 is symmetrically provided with limiting seats 24 for fixing the end of the workpiece on both sides. The bottom of the limiting seat 24 is slidably engaged with the bearing base 21. The side end of the limiting seat 24 is provided with a rotating disk 25 for fixing the end of the workpiece.

[0033] The drive assembly 4 includes drive frames 41 symmetrically arranged on the side of the support base 21. The bottom of the drive frames 41 is slidably arranged in a sliding track 42 on the base 1. An adjustment shaft 43 that can be rotated and adjusted is provided between the two drive frames 41. A welding machine 44 is provided on the adjustment shaft 43. The welding clamp 3 is installed on the welding machine 44. A hand rest 45 for supporting the arm is connected between the two drive frames 41.

[0034] In this embodiment, as Figures 4 to 9 As shown, the linkage component 5 includes a drive bevel gear 51 disposed on the side of the support base 21. The center of the drive bevel gear 51 is connected to the end of the drive shaft 23. Vertically arranged fixing frames 52 are provided on both sides of the drive bevel gear 51. Each fixing frame 52 is provided with a rotating sleeve 53. A central shaft 54 ​​is rotatably engaged between two rotating sleeves 53. A conical part 55 is provided at the adjacent end of each of the two rotating sleeves 53. The conical part 55 is sleeved on the outside of the central shaft 54. A mating bevel gear 56 is sleeved on one of the rotating sleeves 53. The rotating sleeve 53 closer to the mating bevel gear 56 is rotatably engaged with the fixing frame 52. The side end of the mating bevel gear 56 meshes with the side end of the drive bevel gear 51. One end of the central shaft 54 ​​is connected to the output end of the drive motor 57.

[0035] A plurality of sliding blocks 58 are evenly distributed in the middle of the central shaft 54. A sliding member 59 is sleeved on the middle of the central shaft 54. The sliding member 59 is slidably disposed on the plurality of sliding blocks 58. Both ends of the sliding member 59 are connected to a conical retaining sleeve 60. The conical retaining sleeve 60 is slidably disposed on the central shaft 54. The conical retaining sleeve 60 can be sleeved on the outside of the conical member 55. A plurality of sliding blocks 58 are evenly distributed on the outside of the conical member 55 away from the mating bevel gear 56. The limiting block 61 has a slot 62 on the inner side of the conical locking sleeve 60 away from the cooperating bevel gear 56, which is used to cooperate with the limiting block 61. The upper and lower sides of the sliding member 59 are symmetrically provided with arc-shaped blocks 63. The arc-shaped blocks 63 are rotatably engaged with the sliding member 59. The two arc-shaped blocks 63 are respectively hinged to the two ends of the connecting frame 64. The side end of the connecting frame 64 is provided with a connecting rod 65. The middle part of the connecting rod 65 is rotatably connected to the locking shaft 68 on the auxiliary table 67 through a reset coil spring 66.

[0036] The connecting assembly 7 includes an L-shaped frame 71 disposed on the side of the auxiliary platform 67. The L-shaped frame 71 is rotatably mounted on a reset shaft 72 on the side via a coil spring. One end of the L-shaped frame 71 is located on one side of the connecting rod 65, and an abutment wheel 73 is rotatably disposed on the other end of the L-shaped frame 71. The auxiliary platform 67 is provided with an infrared sensor 74 that can control the start and stop of the drive motor 57. When the connecting rod 65 deflects on the retaining shaft 68, the drive motor 57 can be started by controlling the infrared sensor 74.

[0037] A control plate 75 is provided on one side of the L-shaped frame 71. The bottom of the control plate 75 is connected to the base 1. Limiting rails 76 are symmetrically provided on both sides of the control plate 75. Control rods 77 are slidably engaged on the two limiting rails 76. An L-shaped abutment frame 78 is provided at the bottom of one end of the control rod 77. The bottom of the L-shaped abutment frame 78 is located above the abutment wheel 73. The other end of the control rod 77 is located below the adjusting shaft 43. The bottom of the control rod 77 is movably connected to the base 1 through a spring telescopic rod 79. A rotating pressing member 80 is provided on the adjusting shaft 43. When the adjusting shaft 43 deflects, the rotating pressing member 80 can press against the control plate 75, causing the control plate 75 to compress the spring telescopic rod 79.

[0038] In this embodiment, as Figures 1 to 9 As shown, a method for using an arc welding device for automotive aftertreatment assemblies includes the following steps:

[0039] S1: The operator places the workpiece to be welded on the support rollers 22 on the support base 21 and locks it at the end of the workpiece by rotating the disc 25. The workpiece is then positioned and fixed by moving the limiting seat 24. The position of the welding machine 44 is then moved by controlling the position of the drive frame 41 in the sliding track 42, so that the hand rests on the hand rest 45 and the welding clamp 3 carrying the welding wire moves towards the welding point of the workpiece, thereby facilitating the welding work.

[0040] S2: After moving the wire a corresponding distance according to its length, the manual drive deflects the wire under the action of the adjusting shaft 43, causing the wire end to fit against the annular weld seam of the workpiece. At this time, the rotating pressing part 80 abuts against the control rod 77, causing the control rod 77 to move down along the limit track 76 and compress the spring telescopic rod 79. Through the cooperation of the L-shaped contact frame 78 and the contact wheel 73, the L-shaped frame 71 deflects. The L-shaped frame 71 drives the connecting rod 65 to deflect on the clamping shaft 68. At this time, the infrared sensor 74 controls the drive motor 57 to work, and the central shaft 54 ​​rotates synchronously. Under the action of the sliding block 58, the sliding... The moving part 59 rotates synchronously between the two arc blocks 63. During the deflection of the connecting rod 65, the sliding part 59 is driven to slide through the sliding block 58 via the connecting frame 64 and the arc block 63. This causes the conical locking sleeve 60, which is close to the mating bevel gear 56, to be locked on the outside of the adjacent conical part 55. The other conical locking sleeve 60 is also released from the limiting block 61. Then, under the synchronous action of the rotating sleeve 53 and the conical part 55, the mating bevel gear 56 is driven to rotate synchronously, which drives the driving bevel gear 51 that meshes with it to rotate. The workpiece is then rotated via the support roller 22, and then welding is performed.

[0041] S3: When the worker moves the welding wire away from the weld seam by adjusting the shaft 43, the control rod 77 loses its resistance and resets under the action of the spring telescopic rod 79. The L-shaped frame 71 resets under the action of the coil spring, and the connecting rod 65 synchronously drives the sliding part 59 to reset under the action of the reset coil spring 66. This causes the conical locking sleeve 60 to lock onto the limiting block 61 through the bayonet 62, thereby quickly suppressing the workpiece's inertial rotation, reducing the rotational stroke of the workpiece after it is removed from the drive, ensuring the welding accuracy of the annular weld seam, and accurately continuing the previous welding work when the adjusting shaft 43 is deflected again, thus enabling stable continuous welding operations.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electric arc welding device for an automotive aftertreatment assembly, comprising a base (1). Its features are: The base (1) is provided with a bearing assembly (2) for supporting the workpiece. A drive assembly (4) for placing welding clamps (3) is provided on one side of the bearing assembly (2). A linkage assembly (5) is provided on the side end of the drive assembly (4). A connecting assembly (7) is provided on the side of the linkage assembly (5) near the bearing assembly (2). The connecting assembly (7) can drive the bearing assembly (2) to rotate the workpiece for welding, and can consume the rotational inertia of the workpiece under the action of the linkage assembly (5).

2. The arc welding device for automotive aftertreatment assembly according to claim 1, characterized in that: The support component (2) includes a support base (21); The bearing base (21) is slidably disposed on the base (1), and the bearing base (21) is provided with support rollers (22) capable of supporting the workpiece. The support roller (22) is rotatably mounted on the bearing base (21) via the drive shaft (23); The support base (21) is provided with limiting seats (24) on both sides for fixing the ends of the workpiece. The bottom of the limiting seat (24) is slidably engaged with the supporting base (21); The side end of the limiting seat (24) is provided with a rotating disk (25) for fixing the end of the workpiece.

3. The arc welding device for an automotive aftertreatment assembly according to claim 2, characterized in that: The drive assembly (4) includes drive frames (41) symmetrically arranged on the side of the support base (21). The bottom of the drive frame (41) is slidably disposed in the sliding rail (42) on the base (1), and an adjustment shaft (43) capable of rotational adjustment is provided between the two drive frames (41). A welding machine (44) is provided on the adjusting shaft (43), and the welding clamp (3) is installed on the welding machine (44); A hand rest (45) for supporting the arm is connected between the two drive frames 41.

4. The arc welding device for an automotive aftertreatment assembly according to claim 2, characterized in that: The linkage component (5) includes a drive bevel gear (51) disposed on the side of the support base (21). The center of the drive bevel gear (51) is connected to the end of the drive shaft (23), and vertically arranged fixing brackets (52) are provided on both sides of the drive bevel gear (51). Each of the fixed frames (52) is provided with a rotating sleeve (53), and a central shaft (54) is rotatably engaged between the two rotating sleeves (53). Each of the two rotating sleeves (53) has a tapered part (55) at one of its adjacent ends, and the tapered part (55) is sleeved on the outside of the central shaft (54); One of the rotating sleeves (53) is fitted with a bevel gear (56), wherein the rotating sleeve (53) near the bevel gear (56) is rotatably engaged with the fixed frame (52), and the side end of the bevel gear (56) meshes with the side end of the drive bevel gear (51); One end of the central shaft (54) is connected to the output end of the drive motor (57).

5. The arc welding device for an automotive aftertreatment assembly according to claim 4, characterized in that: Several sliding blocks (58) are evenly distributed in the middle of the central shaft (54). A sliding member (59) is sleeved on the middle part of the central shaft (54), and the sliding member (59) is slidably disposed on a plurality of sliding blocks (58); Both ends of the sliding member (59) are connected to the conical retaining sleeve (60), and the conical retaining sleeve (60) is slidably mounted on the central shaft (54); The conical locking sleeve (60) can be fitted onto the outside of the conical part (55), and a number of limiting blocks (61) are evenly distributed on the outside of the conical part (55) away from the mating bevel gear (56). The inner side of the conical locking sleeve (60) that is far from the cooperating bevel gear (56) is provided with a slot (62) that is used to cooperate with the limiting block (61). The sliding member (59) is provided with arc-shaped blocks (63) symmetrically arranged on the upper and lower sides, and the arc-shaped blocks (63) are rotated and engaged with the sliding member (59); The two arc-shaped blocks (63) are respectively hinged to the two ends of the connecting frame (64), and the side end of the connecting frame (64) is provided with a connecting rod (65). The middle part of the connecting rod (65) is rotatably connected to the retaining pin (68) on the auxiliary platform (67) by a reset coil spring (66).

6. The arc welding device for an automotive aftertreatment assembly according to claim 5, characterized in that: The connecting component (7) includes an L-shaped frame (71) disposed on the side of the auxiliary platform (67). The L-shaped frame (71) is rotatably mounted on the reset shaft (72) at the side end by a coil spring, and one end of the L-shaped frame (71) is located on one side of the connecting rod (65); The other end of the L-shaped frame (71) is rotatably equipped with a contact wheel (73), and the auxiliary platform (67) is equipped with an infrared sensor (74) that can control the start and stop of the drive motor (57). When the connecting rod (65) deflects on the clasp (68), the drive motor (57) can be started by controlling the infrared sensor (74).

7. The electric arc welding device for an automotive aftertreatment assembly according to claim 6, characterized in that: A control panel (75) is provided on one side of the L-shaped frame (71); The bottom of the control board (75) is connected to the base (1), and the control board (75) is provided with symmetrical limit rails (76) on both sides. A control rod (77) is slidably fitted on the two limiting rails (76), and an L-shaped abutment (78) is provided at the bottom of one end of the control rod (77). The bottom of the L-shaped contact frame (78) is located above the contact wheel (73), and the other end of the control lever (77) is located below the adjusting shaft (43); The bottom of the control lever (77) is movably connected to the base (1) via a spring telescopic rod (79), and a rotating pressing part (80) is provided on the adjusting shaft (43). When the adjusting shaft (43) deflects, the control plate (75) can be pressed by rotating the pressing member (80), causing the control plate (75) to compress the spring telescopic rod (79).

8. A method of using an arc welding apparatus for an automotive aftertreatment assembly, comprising using an arc welding apparatus for an automotive aftertreatment assembly as described in any one of claims 1-7, characterized in that, Includes the following steps: S1: The operator places the workpiece to be welded on the support roller (22) on the support base (21) and locks it at the end of the workpiece by rotating the disc (25). The workpiece is fixed in position by moving the limiting seat (24). Then, the position of the welding machine (44) is moved by controlling the position of the drive frame (41) in the sliding track (42), so that the hand rests on the hand rest (45) and the welding clamp (3) carrying the welding wire moves towards the welding point of the workpiece, thereby facilitating the welding work. S2: After moving the wire a corresponding distance according to its length, manually drive the wire to deflect under the action of the adjusting shaft (43), so that the end of the wire is in contact with the annular weld of the workpiece. At this time, the rotating pressing part (80) abuts against the control rod (77), causing the control rod (77) to move down along the limit track (76) and compress the spring telescopic rod (79). Through the cooperation of the L-shaped contact frame (78) and the contact wheel (73), the L-shaped frame (71) deflects. The L-shaped frame (71) drives the connecting rod (65) to deflect on the clamping shaft (68). At this time, the infrared sensor (74) controls the drive motor (57) to work, and the central shaft (54) rotates synchronously. Under the action of the sliding block (58), the sliding shaft is driven to move. The component (59) rotates synchronously between two arc blocks (63), and during the deflection of the connecting rod (65), the sliding component (59) is driven to slide through the sliding block (58) via the connecting frame (64) and the arc block (63), so that the conical locking sleeve (60) close to the mating bevel gear (56) is locked on the outside of the adjacent conical component (55), and the other conical locking sleeve (60) is released from the limiting block (61). Then, under the synchronous action of the rotating sleeve (53) and the conical component (55), the mating bevel gear (56) is driven to rotate synchronously, which drives the driving bevel gear (51) meshing with it to rotate, and the workpiece is driven to rotate through the support roller (22), and then welding operation is performed. S3: When the worker moves the welding wire away from the weld seam by adjusting the shaft (43), the control rod (77) loses its resistance and resets under the action of the spring telescopic rod (79). The L-shaped frame (71) resets under the action of the coil spring, and the connecting rod (65) synchronously drives the sliding part (59) to reset under the action of the reset coil spring (66). This causes the conical locking sleeve (60) to be locked on the limiting block (61) through the bayonet (62), thereby quickly suppressing the workpiece's inertial idling, reducing the workpiece's rotation stroke after it leaves the drive, ensuring the welding accuracy of the annular weld seam, and accurately continuing the previous welding work when the adjusting shaft (43) is deflected again, thus enabling stable continuous welding operations.

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