Muffler inner pipe spot welding mechanism and muffler spot welding method

Abstract

The present invention discloses a muffler inner tube spot welding mechanism and a muffler spot welding method, comprising a frame, a controller installed on one side of the machine, and a spot welding device located on the other side of the frame, wherein the frame is equipped with a horizontal moving mechanism, a lifting mechanism is slidably installed on the horizontal moving mechanism, a workbench is installed on the top of the lifting mechanism, a rotating motor is provided on the workbench, the rotating motor is connected to a rotating shaft, a clamping mechanism is fixed on the end of the rotating shaft opposite to the rotating motor, the clamping mechanism clamps the muffler, the workbench is also provided with a positioning structure, and the positioning structure is provided with a U-shaped groove, the outer peripheral side of the muffler contacts and positions in the U-shaped groove, the end of the muffler opposite to the clamping mechanism faces the spot welding device and is sleeved with a steel wool ring. The present invention realizes horizontal and vertical movement of the muffler and automatic rotation clamping through each cylinder and the rotating electric mechanism, thereby improving welding efficiency and precision.

Description

Technical Field

[0001] The invention relates to the technical field of muffler processing devices, in particular to a muffler inner pipe spot welding mechanism and a muffler spot welding method. Background Art

[0002] Mufflers are widely used in automobiles, machinery, and other fields, primarily to reduce noise. Existing mufflers are typically long tubular structures, the ends of which require welding to steel wool rings to ensure sealing and overall strength.

[0003] Traditional muffler welding methods mainly rely on manual operation, using special welding molds to fix the muffler. Some use mechanical welding. Since the end of the muffler needs to be spot welded at four points with 90° evenly spaced, and the traditional fixing method limits the movement and rotation of the muffler, the operator needs to manually loosen the clamp and reposition it after welding one weld point, find the next weld point and then clamp it. This operation process is cumbersome and inefficient, and it is difficult to ensure the position accuracy of the welding point. If existing mechanical welding is used, accuracy problems will still occur.

[0004] The manual operation method is inefficient and takes a long time to weld. In addition, the position of the welding points in the existing technology is prone to deviation. The operation is cumbersome and requires repeated positioning and clamping, which affects the deformation of the silencer pipe and causes quality problems such as damage.

[0005] Therefore, it is necessary to provide a muffler inner tube spot welding mechanism and a four-point spot welding method for the muffler and steel wool ring, which can directly rotate the muffler in a clamped state, improve welding efficiency, ensure the position accuracy of the welding points, and reduce labor costs. Summary of the Invention

[0006] The present invention provides a muffler inner pipe spot welding mechanism and a muffler spot welding method to solve the problems raised in the above background technology.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A spot welding mechanism for an inner tube of a muffler comprises a frame, a controller installed on one side of the machine and a spot welding device located on the other side of the frame, a horizontal moving mechanism is installed on the frame, a lifting mechanism is slidably installed on the horizontal moving mechanism, a workbench is installed on the top of the lifting mechanism, a rotating motor is provided on the workbench, the rotating motor is connected to a rotating shaft, a clamping mechanism is fixed on the end of the rotating shaft opposite to the rotating motor, the clamping mechanism clamps the muffler, a positioning structure is also provided on the workbench, and a U-shaped groove is provided on the positioning structure, the outer peripheral side of the muffler is contacted and positioned in the U-shaped groove, the end of the muffler opposite to the clamping mechanism faces the spot welding device and is sleeved with a steel wool ring, the spot welding device, horizontal moving mechanism, lifting mechanism, rotating motor and clamping mechanism are electrically connected to the controller respectively.

[0009] Preferably, the horizontal movement mechanism includes a push cylinder mounted in the middle of the upper portion of the frame, two slide rails symmetrically mounted on the frame on either side of the push cylinder, and sliders slidably mounted on both slide rails. The push cylinder's extension and contraction direction is the same as the sliding direction of the slider, and the push cylinder is electrically connected to a controller.

[0010] Preferably, the lifting mechanism includes a movable platform connected to and mounted on top of the slider, a connecting plate provided at the bottom of the movable platform, and a telescopic end of the push cylinder fixedly connected to the connecting plate, a plurality of lifting cylinders on top of the movable platform, the work platform and the telescopic end of the lifting cylinders being mounted and connected, and the lifting cylinders being electrically connected to a controller. The pushing cylinders push and pull the connecting plate, thereby driving the movable platform to move horizontally along the slide rail, and the lifting cylinders drive the work platform to move vertically, thereby achieving vertical and horizontal position adjustment of the muffler clamped by the clamping mechanism.

[0011] Preferably, the workbench is provided with two bearing seats, the rotating shaft is movably mounted on the bearing seats, a first transmission wheel is fixed to the rotating shaft between the two bearing seats, the rotating motor is mounted on the workbench on one side of the first transmission wheel, a second transmission wheel is fixed to the output shaft of the rotating motor, and a transmission belt is connected between the first and second transmission wheels. The rotating motor drives the rotating shaft to rotate via the transmission belt, thereby driving the clamping mechanism and the muffler to rotate.

[0012] Preferably, the clamping mechanism includes a pneumatic gripper having two opposing clamping ends, each of which has a clamping block mounted on opposite sides of the clamping ends. A first connecting block is mounted on the side of the pneumatic gripper opposite the clamping block, and a second connecting block is mounted on the end of the rotating shaft proximate the pneumatic gripper. The first and second connecting blocks are threadedly connected, and the pneumatic gripper is electrically connected to a controller. Pneumatic grippers, also known as finger cylinders, are a mature, existing technology and will not be described in detail here.

[0013] Preferably, the two clamping blocks are provided with arcuate grooves on opposite sides, and the curvature of the two arcuate grooves matches the curvature of the outer surface of the muffler. The clamping blocks and the pneumatic clamping jaws are detachably connected by bolts, and by replacing the clamping blocks with different curvatures, the clamping can be adapted to mufflers of different diameters.

[0014] Preferably, a pad is provided on the side of the pneumatic clamp opposite the connecting block. The pad has a mounting opening on the side facing the muffler, and a fixing block is mounted within the mounting opening. The fixing block is butt-connected to the end of the muffler. This serves to position the muffler toward one end of the clamping mechanism. The fixing block is fixed to the pad by bolts, and mufflers of different diameters can be positioned and connected by replacing fixing blocks of different diameters.

[0015] Preferably, the positioning structure includes several support brackets mounted on the workbench, the U-shaped groove being located in the middle of the support brackets, the U-shaped grooves being provided with several threaded holes, and positioning wheels being removably mounted on the threaded holes. The support brackets are arranged front and back in a straight line, and the muffler is placed in the U-shaped grooves in the same straight line. The support brackets provide support to prevent the muffler from shifting during processing.

[0016] Preferably, the outer surface of the positioning wheel is provided with a rubber layer, and rollers are provided at the four corners of the bottom of the frame. The positioning wheel is used to locate the position of the welded end of the muffler. It also rotates in conjunction with the positioning wheel when the muffler rotates, preventing the outer surface of the muffler from directly contacting and rotating with the support frame, which could cause scratches on the outer surface of the muffler. The size of the positioning wheel can be changed according to the size of the muffler, thereby accommodating the positioning of mufflers of different sizes. The rollers facilitate the movement of the entire device.

[0017] Preferably, the spot welding device includes a welding machine body, an upper bracket and a lower bracket are installed on the side of the welding machine body facing the frame, an upper telescopic rod is installed on the upper bracket, and a lower telescopic rod is installed on the lower bracket. The telescopic end of the upper telescopic rod is arranged opposite to the telescopic end of the lower telescopic rod, and the telescopic end of the upper telescopic rod is installed with an upper electrode, and the telescopic end of the lower telescopic rod is installed with a lower electrode, the upper electrode and the lower electrode are electrically connected to the welding machine body respectively, and the welding machine body is electrically connected to the controller.

[0018] A muffler spot welding method based on the above-mentioned muffler inner tube spot welding mechanism comprises the following steps:

[0019] 1) Sleeve the steel wool loop onto the end of the muffler, place the muffler on the support frame, use the positioning wheel to position the welding end of the muffler, and dock the other end of the muffler onto the fixing block;

[0020] 2) Start the pneumatic clamp to clamp the end of the muffler to complete the clamping and positioning of the muffler, start the push cylinder to push and pull the workbench on the slide rail to adjust the horizontal position of the muffler on the clamping mechanism, or start the lifting cylinder to drive the workbench to move up and down to adjust the vertical position of the muffler;

[0021] 3) Move the first welding point between the steel wool loop and the muffler to between the upper electrode and the lower electrode, activate the upper and lower telescopic rods, so that the upper electrode contacts the steel wool loop and the lower electrode contacts the inner wall of the muffler;

[0022] 4) Start the welding machine body to weld the first spot. After the spot welding is completed, reset the upper and lower telescopic rods, start the rotary motor, and drive the rotating shaft through the transmission belt, transmission wheel 1, and transmission wheel 2, thereby driving the clamping mechanism and the muffler clamped therewith to rotate 90°, and then proceed to the second spot for welding. Repeat the above operation to perform electric welding on the four spots of the steel wool ring and the muffler to complete the processing.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The invention drives the slide block to move on the slide rail by pushing the cylinder to extend and retract, thereby realizing horizontal movement of the muffler, and drives the workbench to move vertically by the extension and retraction of the lifting cylinder, thereby realizing vertical adjustment of the muffler. At the same time, the cooperation of the rotating motor and the rotating shaft enables the silencer to be rotated after being clamped, which facilitates the operator to locate the welding point and avoids the tedious operation of manually loosening the clamp and adjusting the position of the traditional fixed clamp, thereby reducing labor costs and improving welding efficiency. By setting the rotating motor, rotating shaft, clamping mechanism and positioning structure, the effect of automatic rotation clamping of the silencer is achieved. The rotating motor can drive the rotating shaft to rotate, and the clamping mechanism can rotate with the rotating shaft. The silencer is flexibly fixed to the workbench through the clamping part, and the positioning structure with a U-shaped groove is used to make the outer peripheral side of the silencer contact with the inner side of the U-shaped groove to achieve precise positioning. With the installation of the corresponding size of the positioning wheel, it can be applied to silencers of different sizes, solving the problem of low efficiency and low precision of manual or other mechanical clamping rotation. In addition, by setting the upper and lower telescopic rods on the side of the welding machine body, the upper and lower electrodes can be lifted and lowered relative to each other, without the need for manual alignment welding, preventing the problem of misalignment of the upper and lower pole welding points caused by manual search for welding points, and improving the production yield of the product.

[0025] The spot welding method of the present invention is easy to operate and does not require manual adjustment of the rotation angle and position of the muffler, thereby preventing the problem of spot welding position deviation that may be caused by manual adjustment, effectively improving spot welding efficiency, reducing workers' work intensity, and improving precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic structural diagram of the horizontal moving mechanism and the lifting mechanism of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of each device on the top of the workbench of the present invention;

[0029] Figure 4 It is a schematic structural diagram of the clamping mechanism of the present invention;

[0030] Figure 5 A schematic diagram of a spacer block and a fixing block of the present invention;

[0031] Figure 6 It is a schematic diagram of the positioning structure of the present invention;

[0032] Figure 7 Schematic diagram of the muffler and steel wool ring of the present invention;

[0033] Figure 8 It is a schematic structural diagram of the spot welding device of the present invention;

[0034] 1. Workbench; 2. Rotating motor; 3. Rotating shaft; 4. Clamping mechanism; 5. Muffler; 6. Steel wool ring; 7. Positioning structure; 8. U-shaped groove; 9. Bearing seat; 10. Drive pulley 1; 11. Drive pulley 2; 12. Drive belt; 13. Connecting block 1; 14. Pneumatic gripper; 15. Clamping end; 16. Clamping block; 17. Spacer block; 18. Fixing block; 19. Support frame; 20. Positioning wheel; 21. Mounting port 22. Arc groove; 23. Frame; 24. Moving platform; 25. Push cylinder; 26. Slide rail; 27. Slider; 28. Lifting cylinder; 29. ​​Connecting plate; 30. Roller; 31. Horizontal moving mechanism; 32. Lifting mechanism; 33. Controller; 34. Spot welding device; 35. Welding machine body; 36. Upper bracket; 37. Lower bracket; 38. Upper telescopic rod; 39. Lower telescopic rod; 40. Upper electrode; 41. Lower electrode. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] Reference Figure 1-8, 1. A muffler inner tube spot welding mechanism, comprising a frame 23, a controller 33 installed on one side of the machine 23 and a spot welding device 34 located on the other side of the frame 23, a horizontal moving mechanism 31 is installed on the frame 23, a lifting mechanism 32 is slidably installed on the horizontal moving mechanism 31, a workbench 1 is installed on the top of the lifting mechanism 32, a rotating motor 2 is provided on the workbench 1, the rotating motor 2 is connected to a rotating shaft 3, a clamping mechanism 4 is fixed on the end of the rotating shaft 3 opposite to the rotating motor 2, the clamping mechanism 4 clamps the muffler 5, a positioning structure 7 is further provided on the workbench 1, and a U-shaped groove 8 is provided on the positioning structure 7, the outer peripheral side of the muffler 5 is in contact with the U-shaped groove 8 for positioning, the end of the muffler 5 opposite to the clamping mechanism 4 faces the spot welding device 34 and is sleeved with a steel wool ring 6, the spot welding device 34, the horizontal moving mechanism 31, the lifting mechanism 32, the rotating motor 2 and the clamping mechanism 4 are electrically connected to the controller 33 respectively.

[0037] The horizontal movement mechanism 31 includes a push cylinder 25 mounted in the middle of the upper portion of the frame 23. Two slide rails 26 are symmetrically mounted on the frame 23 on either side of the push cylinder 25. Slide blocks 27 are slidably mounted on each of the slide rails 26. The push cylinder 25 extends and retracts in the same direction as the slide blocks 27. The push cylinder 25 is electrically connected to a controller 33.

[0038] The lifting mechanism 32 includes a movable platform 24 connected to and mounted on top of a slider 27. A connecting plate 29 is provided at the bottom of the movable platform 24, and the telescopic end of the push cylinder 25 is fixedly connected to the connecting plate 29. A plurality of lifting cylinders 28 are mounted on top of the movable platform 24. The work platform 1 is mounted and connected to the telescopic ends of the lifting cylinders 28. The lifting cylinders 28 are electrically connected to a controller 33. The push cylinders 25 push and pull the connecting plate 29, thereby driving the movable platform 24 to move horizontally along the slide rail 26. The lifting cylinders 28 drive the work platform 1 to move vertically, thereby achieving vertical and horizontal position adjustment of the muffler 5 clamped by the clamping mechanism 4.

[0039] The workbench 1 is provided with two bearing seats 9, on which the rotating shaft 3 is movably mounted. A transmission wheel 10 is fixed to the rotating shaft 3 between the two bearing seats 9. The rotating motor 2 is mounted on the workbench 1 on one side of the transmission wheel 10. A transmission wheel 2 11 is fixed to the output shaft of the rotating motor 2. A transmission belt 12 is connected between the transmission wheels 10 and 11. The rotating motor 2 drives the rotating shaft 3 to rotate via the transmission belt 12, thereby driving the clamping mechanism and the muffler 5 to rotate.

[0040] The clamping mechanism 4 includes a pneumatic gripper 14 having two opposing clamping ends 15. Clamping blocks 16 are mounted on opposing sides of the two clamping ends 15. A connecting block 13 is mounted on the side of the pneumatic gripper 14 opposite the clamping block 16. A connecting block 2 is mounted on the end of the rotating shaft 3 proximal to the pneumatic gripper 14. Connecting block 13 and connecting block 2 are threadedly connected. The pneumatic gripper 14 is electrically connected to a controller 33. The pneumatic gripper 14, also known as a finger cylinder, is a mature, existing technology and will not be described in detail here.

[0041] The two clamping blocks 16 are each provided with an arcuate groove 22 on opposite sides thereof, the curvature of the two arcuate grooves 22 matching the curvature of the outer circumference of the muffler 5. The clamping blocks 16 are detachably connected to the pneumatic clamping jaws 14 via bolts, and by replacing the clamping blocks 16 with different curvatures, the clamping can be adapted to mufflers 5 of different diameters.

[0042] A pad 17 is provided on the side of the pneumatic clamp 14 opposite the connecting block 13. A mounting opening 21 is provided on the side of the pad 17 facing the muffler 5. A fixing block 18 is mounted within the mounting opening 21 and is butt-connected to the end of the muffler 5. This serves to position the muffler 5 toward one end of the clamping mechanism. The fixing block 18 is bolted to the pad 17, and mufflers 5 of varying diameters can be positioned and connected by replacing the fixing block 18 with different diameters.

[0043] The positioning structure 7 includes several support frames 19 mounted on the workbench 1. The U-shaped groove 8 is located in the middle of the support frames 19. The U-shaped groove 8 is provided with several threaded holes, and positioning wheels 20 are removably mounted on the threaded holes. The support frames 19 are arranged in a straight line, front and back, and the muffler 5 is placed in the U-shaped groove 8 on the same line. The support frames 19 provide support and prevent the muffler 5 from shifting during processing.

[0044] The outer surface of the positioning wheel 20 is provided with a rubber layer. The positioning wheel 20 is used to locate the position of the welded end of the muffler 5. At the same time, when the muffler 5 rotates, it can rotate in conjunction with the positioning wheel 20 to prevent the outer surface of the muffler 5 from directly contacting and rotating with the support frame 19, which may cause scratches on the outer surface of the muffler 5. The size of the positioning wheel 20 can be changed according to the size of the muffler 5, thereby adapting to the positioning of mufflers 5 of different sizes.

[0045] The spot welding device 34 includes a welding machine body 35, and an upper bracket 36 and a lower bracket 37 are installed on the side of the welding machine body 35 facing the frame. An upper telescopic rod 38 is installed on the upper bracket 36, and a lower telescopic rod 39 is installed on the lower bracket 37. The telescopic end of the upper telescopic rod 38 is arranged opposite to the telescopic end of the lower telescopic rod 39, and an upper electrode 40 is installed at the telescopic end of the upper telescopic rod 38, and a lower electrode 41 is installed at the telescopic end of the lower telescopic rod 39. The upper electrode 40 and the lower electrode 41 are respectively electrically connected to the welding machine body 35, and the welding machine body 35 is electrically connected to the controller 33. The spot welding device 34 is a positive and negative resistance spot welding machine, and its principle is the same as that of an existing resistance welding machine. It is an existing mature technology and will not be described in detail here.

[0046] A muffler spot welding method based on the above-mentioned muffler inner tube spot welding mechanism comprises the following steps:

[0047] 1) Sleeve the steel wool loop 6 onto the end of the muffler 5, and place the muffler 5 on the support frame 19. Use the positioning wheel 20 to position the welding end of the muffler 5, and at the same time, dock and install the other end of the muffler 5 on the fixing block 18;

[0048] 2) Start the pneumatic clamp 14 to clamp the end of the muffler 5 to complete the clamping and positioning of the muffler 5, start the push cylinder 25 to push and pull the workbench 1 on the slide rail 26 to adjust the horizontal position of the muffler 5 on the clamping mechanism, and also start the lifting cylinder 28 to drive the workbench 1 to move up and down to adjust the vertical position of the muffler 5;

[0049] 3) Move the first welding point between the steel wool loop 6 and the muffler 5 to between the upper electrode 40 and the lower electrode 41, and activate the upper telescopic rod 38 and the lower telescopic rod 39 so that the upper electrode 40 contacts the steel wool loop 6 and the lower electrode 41 contacts the inner wall of the muffler 5;

[0050] 4) Start the welding machine body 35 to weld the first spot. After the spot welding is completed, the upper telescopic rod 38 and the lower telescopic rod 39 are reset, and the rotary motor 2 is started. Through the transmission belt 12, the transmission wheel 10, and the transmission wheel 2 11, the rotary shaft 3 is driven to rotate, and then the clamping mechanism 4 and the muffler 5 clamped therewith are driven to rotate 90°, and then the second spot is welded. Repeat the above operation to perform electric welding on the four spots of the steel wool ring 6 and the muffler 4 to complete the processing.

[0051] The present invention realizes horizontal and vertical movement and automatic rotation clamping of the muffler 5 through the cylinders and the rotary motor 2, thereby improving welding efficiency and accuracy.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0053] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A muffler inner tube spot welding mechanism, comprising a frame (23), a controller (33) mounted on one side of the frame (23), and a spot welding device (34) located on the other side of the frame (23), characterized in that: A horizontal moving mechanism (31) is installed on the frame (23), a lifting mechanism (32) is slidably installed on the horizontal moving mechanism (31), a workbench (1) is installed on the top of the lifting mechanism (32), a rotating motor (2) is provided on the workbench (1), the rotating motor (2) is connected to a rotating shaft (3), a clamping mechanism (4) is fixed on one end of the rotating shaft (3) opposite to the rotating motor (2), the clamping mechanism (4) clamps a silencer (5), a positioning structure (7) is also provided on the workbench (1), and a U-shaped groove (8) is provided on the positioning structure (7), the outer peripheral side of the silencer (5) is contacted and positioned in the U-shaped groove (8), the end of the silencer (5) opposite to the clamping mechanism (4) faces the spot welding device (34) and is sleeved with a steel wool ring (6), the spot welding device (34), the horizontal moving mechanism (31), the lifting mechanism (32), the rotating motor (2) and the clamping mechanism (4) are electrically connected to the controller (33) respectively; The horizontal moving mechanism (31) includes a pushing cylinder (25) installed at the middle position of the upper part of the frame (23), two slide rails (26) are symmetrically installed on the frame (23) on both sides of the pushing cylinder (25), and sliders (27) are slidably installed on the two slide rails (26), and the pushing cylinder (25) is electrically connected to the controller (33); The lifting mechanism (32) includes a movable platform (24) connected to and mounted on the top of a slider (27), a connecting plate (29) is provided at the bottom of the movable platform (24), and the telescopic end of the pushing cylinder (25) is fixedly connected to the connecting plate (29), a plurality of lifting cylinders (28) are provided on the top of the movable platform (24), the workbench (1) is connected to the telescopic end of the top of the lifting cylinder (28), and the lifting cylinder (28) is electrically connected to the controller (33); The workbench (1) is provided with two bearing seats (9), the rotating shaft (3) is movably mounted on the bearing seats (9), a transmission wheel (10) is fixed on the rotating shaft (3) between the two bearing seats (9), the rotating motor (2) is mounted on the workbench (1) on one side of the transmission wheel (10), a transmission wheel (11) is fixed on the output shaft of the rotating motor (2), and a transmission belt (12) is connected between the transmission wheel (10) and the transmission wheel (11); The clamping mechanism (4) includes a pneumatic clamp (14), the pneumatic clamp (14) is provided with two clamping ends (15) arranged opposite to each other, and a clamping block (16) is installed on the opposite side of the two clamping ends (15). The pneumatic clamp (14) is provided with a connecting block (13) on the side opposite to the clamping block (16), and the end of the rotating shaft (3) close to the pneumatic clamp (14) is provided with a connecting block (2). The connecting block (13) and the connecting block (2) are fixedly connected by threads, and the pneumatic clamp (14) is electrically connected to the controller (33).

2. The muffler inner tube spot welding mechanism according to claim 1, characterized in that: An arcuate groove (22) is provided on one opposite side of the two clamping blocks (16), and the curvature of the two arcuate grooves (22) matches the curvature of the outer peripheral surface of the muffler (5).

3. The muffler inner tube spot welding mechanism according to claim 2, characterized in that: A pad (17) is provided on the side of the pneumatic clamp (14) opposite to the connecting block (13), and a mounting opening (21) is provided on the side of the pad (17) facing the muffler (5). A fixing block (18) is installed in the mounting opening (21), and the fixing block (18) is butt-connected to the end of the muffler (5).

4. The muffler inner tube spot welding mechanism according to claim 3, characterized in that: The positioning structure (7) comprises a plurality of support frames (19) mounted on the workbench (1), the U-shaped groove (8) is located in the middle of the support frame (19), the U-shaped groove (8) is provided with a plurality of threaded holes, and positioning wheels (20) are detachably mounted on the threaded holes.

5. The muffler inner tube spot welding mechanism according to claim 4, characterized in that: The spot welding device (34) includes a welding machine body (35), an upper bracket (36) and a lower bracket (37) are installed on one side of the welding machine body (35) facing the frame, an upper telescopic rod (38) is installed on the upper bracket (36), and a lower telescopic rod (39) is installed on the lower bracket (37), the telescopic end of the upper telescopic rod (38) and the telescopic end of the lower telescopic rod (39) are arranged opposite to each other, and an upper electrode (40) is installed on the telescopic end of the upper telescopic rod (38), and a lower electrode (41) is installed on the telescopic end of the lower telescopic rod (39), the upper electrode (40) and the lower electrode (41) are respectively electrically connected to the welding machine body (35), and the welding machine body (35) is electrically connected to the controller (33).

6. A muffler spot welding method based on the muffler inner tube spot welding mechanism according to claim 5, characterized in that: The steps are as follows: 1) Sleeve the steel wool loop (6) onto the end of the muffler (5), and place the muffler (5) on the support frame (19). Use the positioning wheel (20) to position the welding end of the muffler (5), and simultaneously dock and mount the other end of the muffler (5) on the fixing block (18); 2) Start the pneumatic clamp (14) to clamp the end of the muffler (5) to complete the clamping and positioning of the muffler (5), start the push cylinder (25) to push and pull the workbench (1) on the slide rail (26), and adjust the horizontal position of the muffler (5) on the clamping mechanism. Also start the lifting cylinder (28) to drive the workbench (1) to move up and down to adjust the vertical position of the muffler (5); 3) Move the first welding point between the steel wool loop (6) and the muffler (5) to between the upper electrode (40) and the lower electrode (41), start the upper telescopic rod (38) and the lower telescopic rod (39), so that the upper electrode (40) contacts the steel wool loop (6) and the lower electrode (41) contacts the inner wall of the muffler (5); 4) Start the welding machine body (35) to weld the first spot. After the spot welding is completed, the upper telescopic rod (38) and the lower telescopic rod (39) are reset, and the rotary motor (2) is started. Through the transmission belt (12), the transmission wheel 1 (10), and the transmission wheel 2 (11), the rotary shaft (3) is driven to rotate, and then the clamping mechanism (4) and the muffler (5) clamped therewith are driven to rotate 90 degrees, and then the second spot is welded. Repeat the above operation to weld the four spots of the steel wool ring (6) and the muffler (5) to complete the processing.

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