Silencer inner pipe spot welding mechanism and silencer spot welding method

Abstract

The invention discloses a silencer inner pipe spot welding mechanism and a silencer spot welding method.The silencer inner pipe spot welding mechanism comprises a rack, a controller installed on one side of the rack and a spot welding device located on the other side of the rack, a horizontal moving mechanism is installed on the rack, a lifting mechanism is installed on the horizontal moving mechanism in a sliding mode, and a workbench is installed at the top of the lifting mechanism; a rotating motor is arranged on the working table, the rotating motor is connected with a rotating shaft, a clamping mechanism is fixed to the end, opposite to the rotating motor, of the rotating shaft, a silencer is clamped by the clamping mechanism, a positioning structure is further arranged on the working table, a U-shaped groove is formed in the positioning structure, and the U-shaped groove is connected with the rotating shaft. The peripheral side of the silencer makes contact with the interior of the U-shaped groove for positioning, and the end, opposite to the clamping mechanism, of the silencer faces the spot welding device and is connected with a steel wool ring in a sleeved mode. Horizontal and vertical movement and automatic rotary clamping of the silencer are achieved through the air cylinders and the rotary electric mechanism, and the welding efficiency and precision are improved.

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 the fields of automobiles, mechanical equipment, etc., and their main function is to reduce noise. Existing mufflers are usually long tubular structures, and their ends need to be welded and fixed with steel wool rings to ensure the sealing and overall strength of the muffler.

[0003] Traditional muffler welding methods mainly use manual operation, using special welding molds to fix the muffler, and 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 a 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 still occur.

[0004] The manual operation method is inefficient and takes a long time to weld. In addition, the position of the welding point in the prior art is prone to deviation. The operation is cumbersome and requires repeated positioning and clamping, which in turn causes the silencer to deform and cause 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 the steel wool ring, which can directly rotate and move 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 silencer 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, wherein 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 arranged 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 silencer, 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 silencer is contacted and positioned in the U-shaped groove, the end of the silencer opposite to the clamping mechanism faces the spot welding device and is sleeved with a steel wool ring, and the spot welding device, the horizontal moving mechanism, the lifting mechanism, the rotating motor and the clamping mechanism are electrically connected to the controller respectively.

[0009] Preferably, the horizontal movement mechanism comprises a push cylinder installed in the middle of the upper part of the frame, two slide rails are symmetrically installed on the frame on both sides of the push cylinder, and sliders are slidably installed on the two slide rails. The extension direction of the push cylinder is the same as the sliding direction of the slider, and the push cylinder is electrically connected to the controller.

[0010] Preferably, the lifting mechanism includes a moving platform connected to and installed on the top of the slider, a connecting plate is provided at the bottom of the moving platform, and the telescopic end of the pushing cylinder is fixedly connected to the connecting plate, a plurality of lifting cylinders are installed on the top of the moving platform, the workbench is connected to the telescopic end of the top of the lifting cylinder, and the lifting cylinder is electrically connected to the controller. The pushing cylinder pushes and pulls the connecting plate, thereby driving the moving platform to move horizontally along the slide rail, and the lifting cylinder drives the workbench to move vertically, thereby realizing the vertical and horizontal position adjustment of the silencer 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 transmission wheel 1 is fixed on the rotating shaft between the two bearing seats, the rotating motor is mounted on the workbench on one side of the transmission wheel 1, a transmission wheel 2 is fixed on the output shaft of the rotating motor, and a transmission belt is connected between the transmission wheel 1 and the transmission wheel 2. The rotating motor drives the rotating shaft to rotate through the transmission belt, thereby driving the clamping mechanism and the muffler to rotate.

[0012] Preferably, the clamping mechanism includes a pneumatic clamping jaw, the pneumatic clamping jaw is provided with two clamping ends arranged opposite to each other, clamping blocks are installed on opposite sides of the two clamping ends, the pneumatic clamping jaw is provided with a connecting block 1 on the side opposite to the clamping block, the end of the rotating shaft close to the pneumatic clamping jaw is provided with a connecting block 2, the connecting block 1 and the connecting block 2 are fixedly connected by threads, and the pneumatic clamping jaw is electrically connected to the controller. The pneumatic clamping jaw is also known as a finger cylinder, which is an existing mature technology and will not be described in detail here.

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

[0014] Preferably, a cushion block is provided on the side of the pneumatic clamp opposite to the connecting block, and a mounting opening is provided on the side of the cushion block facing the muffler, a fixing block is installed in the mounting opening, and the fixing block is butt-connected with the end of the muffler. It serves to position the muffler toward one end of the clamping mechanism, and the fixing block is fixed to the cushion block 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 a plurality of support frames mounted on the workbench, the U-shaped groove is located in the middle of the support frame, the U-shaped groove is provided with a plurality of threaded holes, and the threaded holes are detachably provided with positioning wheels. Each support frame is arranged front and back in the same straight line, and the muffler is placed in the U-shaped groove in the same straight line. The support frame plays a supporting role to prevent the position of the muffler from being offset during the processing.

[0016] Preferably, the outer side 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, and can rotate with the positioning wheel when the muffler rotates, to prevent the outer side of the muffler from directly contacting and rotating with the support frame, resulting in scratches on the outer side of the muffler. The size of the positioning wheel can be replaced according to the size of the muffler, thereby adapting to 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 an upper electrode is installed at the telescopic end of the upper telescopic rod, and a lower electrode is installed at the telescopic end of the lower telescopic rod, 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 muffler inner tube spot welding mechanism as described above comprises the following steps:

[0019] 1) Sleeve the steel wool loop onto the end of the muffler, and place the muffler on the support frame. Use the positioning wheel to position the welding end of the muffler, and at the same time, dock and install the other end of the muffler on 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, and 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 ring and the muffler to between the upper electrode and the lower electrode, start the upper telescopic rod and the lower telescopic rod, so that the upper electrode contacts the steel wool ring 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, the upper telescopic rod and the lower telescopic rod are reset, and the rotating motor is started. Through the transmission belt, transmission wheel 1 and transmission wheel 2, the rotating shaft is driven to rotate, and then the clamping mechanism and the muffler 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 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 extending and retracting the lifting cylinder, thereby realizing vertical adjustment of the muffler. At the same time, the cooperation of the rotating motor and the rotating shaft allows the silencer to be rotated after being clamped, which is convenient for the operator to locate the welding point, avoiding the cumbersome 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, the rotating shaft, the clamping mechanism and the positioning structure, the effect of automatic rotation and 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 on 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 U-shaped groove to achieve precise positioning. With the installation of the positioning wheel of the corresponding size, it can be applied to silencers of different sizes, solving the problem of low efficiency and low precision of manual or other mechanical clamping and rotation. In addition, by setting the upper telescopic rod and the lower telescopic rod on the side of the welding machine body, the upper electrode and the lower electrode are relatively lifted and moved, without manual alignment position welding, preventing the problem of misalignment of the upper and lower pole welding points due to 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 there is no need to manually adjust 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 diagram of the structure of the horizontal moving mechanism and the lifting mechanism of the present invention;

[0028] Figure 3 It 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 diagram of the structure of the clamping mechanism of the present invention;

[0030] Figure 5 It is a schematic diagram of the cushion block and the 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 It is a schematic diagram of the silencer and the steel wool ring of the present invention;

[0033] Figure 8 It is a schematic structural diagram of a 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. Transmission wheel 1; 11. Transmission wheel 2; 12. Transmission belt; 13. Connecting block 1; 14. Pneumatic clamp; 15. Clamping end; 16. Clamping block; 17. Pad; 18. Fixed block; 19. Support frame; 20. Positioning wheel; 21. Installation port; 22. Arc groove; 23. Rack; 24. Moving table; 25. Pushing cylinder; 26. Slide rail; 27. Sliding block; 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work 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 a muffler 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 muffler 5 is contacted and positioned in the U-shaped groove 8, 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 moving mechanism 31 includes a push cylinder 25 installed in the middle of the upper part of the frame 23. Two slide rails 26 are symmetrically installed on the frame 23 on both sides of the push cylinder 25. Slide blocks 27 are slidably installed on both slide rails 26. The extension direction of the push cylinder 25 is the same as the sliding direction of the slide block 27. The push cylinder 25 is electrically connected to the controller 33.

[0038] The lifting mechanism 32 includes a moving platform 24 connected to and installed on the top of the slider 27, a connecting plate 29 is provided at the bottom of the moving 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 installed on the top of the moving platform 24, and the workbench 1 is installed and 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 pushing cylinder 25 pushes and pulls the connecting plate 29, thereby driving the moving platform 24 to move horizontally along the slide rail 26, and the lifting cylinder 28 drives the workbench 1 to move vertically, thereby realizing the vertical and horizontal position adjustment of the muffler 5 clamped by the clamping mechanism 4.

[0039] Two bearing seats 9 are provided on the workbench 1, and 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 2 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 2 11. The rotating motor 2 drives the rotating shaft 3 to rotate through the transmission belt 12, thereby driving the clamping mechanism and the muffler 5 to rotate.

[0040] The clamping mechanism 4 includes a pneumatic clamp 14, which is provided with two clamping ends 15 arranged opposite to each other, and clamping blocks 16 are installed on opposite sides 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, and the connecting block 13 is fixedly connected with the connecting block 2 by threads, and the pneumatic clamp 14 is electrically connected with the controller 33. The pneumatic clamp 14 is also called a finger cylinder, which is an existing mature technology and will not be described in detail here.

[0041] The two clamping blocks 16 are provided with arc grooves 22 on opposite sides, and the curvature of the two arc grooves 22 matches the curvature of the outer peripheral surface of the muffler 5. The clamping block 16 is detachably connected to the pneumatic clamping jaw 14 by bolts, and by replacing the clamping blocks 16 with different curvatures, the mufflers 5 with different diameters can be clamped.

[0042] The pneumatic clamp 14 is provided with a cushion block 17 on the side opposite to the connecting block 13, and the cushion block 17 is provided with a mounting opening 21 on the side facing the muffler 5, and a fixing block 18 is installed in the mounting opening 21, and the fixing block 18 is butt-connected with the end of the muffler 5. It plays a role in positioning the position of the muffler 5 toward one end of the clamping mechanism, and the fixing block 18 is fixed to the cushion block 17 by bolts, and the mufflers 5 of different diameters can be positioned and connected by replacing the fixing blocks 18 of different diameters.

[0043] The positioning structure 7 includes 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 the threaded holes are detachably mounted with positioning wheels 20. The support frames 19 are arranged front and back in the same straight line, and the muffler 5 is placed in the U-shaped groove 8 in the same straight line. The support frames 19 play a supporting role to prevent the muffler 5 from being offset during the processing.

[0044] The outer side 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, and can rotate with the positioning wheel 20 when the muffler 5 rotates, so as to prevent the outer side of the muffler 5 from directly contacting and rotating with the support frame 19, resulting in scratches on the outer side of the muffler 5. The size of the positioning wheel 20 can be replaced according to the size of the muffler 5, so as to adapt 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 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 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 electrically connected to the welding machine body 35 respectively, 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 the existing resistance welding machine, which is an existing mature technology and will not be described in detail here.

[0046] A muffler spot welding method based on the muffler inner tube spot welding mechanism as described above 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, butt-mount 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, and adjust the horizontal position of the muffler 5 on the clamping mechanism. The lifting cylinder 28 can also be started 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, 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;

[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 rotating motor 2 is started to drive the rotating shaft 3 to rotate through the transmission belt 12, the transmission wheel 10, and the transmission wheel 2 11, thereby driving the clamping mechanism 4 and the muffler 5 clamped therewith 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 invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0053] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description 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 may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A muffler inner pipe 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: The frame (23) is provided with a horizontal moving mechanism (31), a lifting mechanism (32) is slidably mounted on the horizontal moving mechanism (31), a workbench (1) is mounted 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 to the end of the rotating shaft (3) opposite to the rotating motor (2), the clamping mechanism (4) clamps a muffler (5), and the workbench (1) is provided with a rotating motor (2). The platform (1) is also provided with a positioning structure (7), and the positioning structure (7) is provided with a U-shaped groove (8). The outer peripheral side of the muffler (5) is in contact with the inside of 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 respectively electrically connected to the controller (33).

2. The muffler inner pipe spot welding mechanism according to claim 1, characterized in that: The horizontal moving mechanism (31) comprises 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).

3. The muffler inner pipe spot welding mechanism according to claim 2, characterized in that: The lifting mechanism (32) includes a moving platform (24) connected and installed on the top of a slider (27), a connecting plate (29) is provided at the bottom of the moving 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 installed on the top of the moving platform (24), the workbench (1) is installed and connected to the telescopic end of the top of the lifting cylinder (28), and the lifting cylinder (28) is electrically connected to a controller (33).

4. The muffler inner pipe spot welding mechanism according to claim 3, characterized in that: 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).

5. The muffler inner pipe spot welding mechanism according to claim 4, characterized in that: The clamping mechanism (4) comprises a pneumatic clamp (14), wherein the pneumatic clamp (14) is provided with two clamping ends (15) arranged opposite to each other, and clamping blocks (16) are installed on opposite sides of the two clamping ends (15); a connecting block (13) is provided on the side of the pneumatic clamp (14) opposite to the clamping block (16); a connecting block (2) is provided on the end of the rotating shaft (3) close to the pneumatic clamp (14); the connecting block (13) and the connecting block (2) are fixedly connected by threads, and the pneumatic clamp (14) is electrically connected to a controller (33).

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

7. The muffler inner pipe spot welding mechanism according to claim 6, characterized in that: A cushion block (17) is provided on the side of the pneumatic clamp (14) opposite to the connecting block (13); a mounting opening (21) is provided on the side of the cushion block (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).

8. The muffler inner pipe spot welding mechanism according to claim 7, 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); a plurality of threaded holes are provided on the U-shaped groove (8); and positioning wheels (20) are detachably mounted on the threaded holes.

9. The muffler inner pipe spot welding mechanism according to claim 8, characterized in that: The spot welding device (34) comprises 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).

10. A muffler spot welding method based on the muffler inner tube spot welding mechanism according to any one of claims 1 to 9, characterized in that: The steps include: 1) Sleeve the steel wool loop (6) on the end of the muffler (5), and place the muffler (5) on the support frame (19), position the welding end of the muffler (5) with the positioning wheel (20), and at the same time, butt-mount the other end of the muffler (5) on the fixing block (18); 2) starting the pneumatic clamp (14) to clamp the end of the muffler (5) to complete the clamping and positioning of the muffler (5), starting the push cylinder (25) to push and pull the workbench (1) on the slide rail (26), and adjusting the horizontal position of the muffler (5) on the clamping mechanism, and also starting the lifting cylinder (28) to drive the workbench (1) to move up and down, and adjusting the vertical position of the muffler (5); 3) moving 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), starting 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 rotating motor (2) is started to drive the rotating shaft (3) to rotate through the transmission belt (12), the transmission wheel 1 (10), and the transmission wheel 2 (11), thereby driving the clamping mechanism (4) and the muffler (5) clamped therewith to rotate 90 degrees, 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.

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