A welding device for automobile parts

Abstract

The application relates to the exhaust pipe welding technical field and discloses a welding device for automobile parts, which comprises an operation table, a mounting seat fixed to the top surface of the operation table, a three-jaw chuck rotatably installed on the side surface of the mounting seat, a rack fixed to the top surface of the operation table, a lifting seat slidingly arranged on the rack and capable of sliding along the height direction of the rack, and a welding machine arranged on the side surface of the lifting seat and located directly above the axis of the three-jaw chuck. The welding device for automobile parts takes the same rotating main shaft as the positioning reference, places two sets of inner expansion type positioning assemblies on the shaft, and then respectively inserts a middle section muffler and a tail throat into the assemblies. The two pipe fittings are automatically centered in the expansion action, and after positioning, the two pipe fittings are coaxial with the main shaft without manual repeated adjustment.

Description

Technical Field

[0001] This invention relates to the field of exhaust pipe welding technology, and more particularly to a welding apparatus for automotive parts. Background Technology

[0002] Automotive exhaust pipe welding equipment is a specialized device used to position and weld the various sections or supports of the exhaust pipe.

[0003] For the tail section of a car exhaust pipe, it typically consists of a large-diameter pipe and a small-diameter pipe. The large-diameter pipe serves as the mid-section muffler, reducing exhaust noise and vibration, while the small-diameter pipe acts as the tailpipe, expelling exhaust gases and also contributing to aesthetics. The two are usually connected by welding, and the mid-section muffler and tailpipe must remain coaxial during the welding process. In the prior art, a search revealed a patent application with publication number CN212946219U that discloses a welding device for a car exhaust pipe muffler package. This solution uses a support rod and a placement plate to fix and clamp the muffler package, and uses a wrench to adjust the moving rod to drive the clamping block to clamp and fix the exhaust pipe. However, the above solution does not have the function of quickly positioning the mid-section muffler and tailpipe. Before welding, the operator needs to manually adjust and position them, which is not only cumbersome, but the fixed shape of the clamping block also results in limited positioning accuracy, making it impossible to guarantee the welding effect and efficiency.

[0004] Therefore, it is necessary to propose a welding device for automotive parts to solve the above problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that the exhaust pipe welding clamping device in the prior art does not have the function of quick positioning of the mid-section muffler and the tailpipe. The manual adjustment and positioning operation before welding is cumbersome, and the positioning accuracy of the fixed shape clamping block is limited, making it difficult to ensure the coaxiality of the two, which affects the welding effect and efficiency. Therefore, we propose a welding device for automotive parts.

[0006] To achieve the above objectives, this application adopts the following technical solution: a welding device for automotive parts, comprising: Control panel; Mounting base, fixed to the top surface of the operating table; A three-jaw chuck is rotatably mounted on the side of the mounting base; The frame is fixed to the top surface of the operating table; The lifting seat is slidably mounted on the frame and can slide along the height direction of the frame; A welding machine is placed on the side of the lifting seat, and the welding machine is located directly above the axis of the three-jaw chuck; A rotating assembly is arranged above the operating table and connected to the three-jaw chuck. The rotating assembly includes a rotating spindle, which is a rod-shaped structure with several protrusions on its surface. Two positioning components are arranged on the rotating spindle. One of the positioning components is fixedly connected to the rotating spindle, and the other positioning component is slidably connected to the rotating spindle. The positioning component includes a frame structure, two movable structures, three clamping structures, and a driving structure. A locking assembly is arranged on the rotating spindle; An adjustment component is arranged at the end of the rotating spindle away from the three-jaw chuck. The adjustment component cooperates with the locking component to lock the slidable positioning component. A support assembly, arranged on the operating table, provides support for the rotating spindle.

[0007] Preferably, the rotating assembly further includes: A fixing rod is fixed to one end of the rotating spindle, and its axis coincides with the axis of the rotating spindle; A mounting slot is provided at the other end of the rotating spindle; The sleeve is fixedly fitted onto the rotating spindle, and the outer edge of the cross-section is circular, with its axis coinciding with the axis of the rotating spindle.

[0008] Preferably, the frame structure includes: Two mounting brackets are positioned facing each other. Three connecting rods are fixed between the two fixing frames; Two assembly frames are fixed on the three connecting rods and located between the two fixed frames. Each of the two assembly frames and the two fixed frames has two slots.

[0009] Preferably, the active structure includes: A sliding frame is slidably mounted on the three connecting rods and is located between the fixed frame and the assembly frame; The three first connecting arms are all hinged at one end to the assembly frame; The three second connecting arms are each hinged at one end to the sliding frame and at the other end to the three first connecting arms respectively.

[0010] Preferably, the clamping structure includes: A horizontal plate is placed on one side of the rotating main shaft and is parallel to the rotating main shaft; Two limiting grooves are respectively opened on both sides of the horizontal plate and arranged along the length of the horizontal plate; Two movable frames are slidably fitted onto the horizontal plate. Each movable frame has an L-shaped lip at both ends, and the two lips slide in two limiting grooves respectively. Two pressure plates are fixed on the two movable frames respectively, and the surface of the pressure plates is provided with an arc surface; The guide rail is fixed to the side of the horizontal plate facing the rotating spindle and is arranged along the length of the horizontal plate. Both sliders are slidably mounted on the guide rail and are respectively hinged to the ends of the two adjacent first connecting arms away from the assembly frame.

[0011] Preferably, the surface of the horizontal plate is provided with a plurality of positioning screw grooves, which are arranged in a linear array along the length of the horizontal plate. Both movable frames are provided with holes, and each of the two holes is provided with a positioning bolt.

[0012] Preferably, the driving structure includes: A dual-axis motor is mounted on both of the aforementioned mounting brackets; Two lead screws are fixed to the two output shafts of the dual-axis motor, respectively, and are parallel to the rotating main shaft. The two lead screws are threadedly connected to the two sliding frames, and the two lead screws rotate in opposite directions.

[0013] Preferably, the locking component includes: Both openings are formed on the surface of the rotating spindle and communicate with the mounting groove; Two locking strips slide into the two openings respectively; Two stops are fixed to the sides of the two clips respectively, located inside the mounting groove; Four first sinkers, in pairs, are respectively opened at both ends of the two aforementioned card strips; Both second settling tanks are formed on the rotating main shaft and communicate with the two openings; Two elastic ribs are placed in the two second sinkers respectively, and are engaged in the corresponding first sinkers.

[0014] Preferably, the adjustment component includes: A through-hole is provided at the end of the rotating spindle away from the fixed rod, and communicates with the mounting groove; A threaded rod passes through the port and is threadedly connected to the port; The movable block, fixed to one end of the threaded rod located in the mounting groove, has a conical structure and its axis coincides with the axis of the threaded rod; A knob is fixed to one end of the threaded rod located outside the mounting groove.

[0015] Preferably, the support component includes: A cylinder is mounted on the top surface of the operating table and is arranged vertically. A support base, fixed to the telescopic end of the cylinder, has a semi-circular cross-section and is positioned directly opposite the sleeve. Several rollers are rotatably mounted on the support base and are evenly distributed on the support base.

[0016] The technical effects and advantages of this invention are as follows: At the tail section welding station of automobile exhaust pipes, the large-diameter mid-section muffler and the small-diameter tailpipe must be strictly coaxial to complete the circumferential weld. This invention uses the same rotating spindle as the positioning reference, and places two sets of internal expansion positioning components on the spindle. After the mid-section muffler and tailpipe are respectively fitted in, they are tightened from the inner wall of the pipe by the circumferentially distributed pressing structure. The two pipes are automatically centered during the expansion action. After positioning, they are coaxial with the spindle, eliminating the need for repeated manual adjustment. The two positioning components share the same spindle as the rotation center, which structurally eliminates the coaxiality error caused when the two exhaust pipes are positioned separately. The axes of the mid-section muffler and tailpipe coincide into a straight line when the clamping is completed, providing a reliable positioning basis for subsequent circumferential weld welding. Attached Figure Description

[0017] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 A schematic diagram of the rotating spindle and two positioning components; Figure 3 A schematic diagram showing the structure when the two positioning components act on the mid-section muffler and the tailpipe, respectively. Figure 4 This is a structural diagram of the positioning component; Figure 5 A structural diagram of the fixed frame, assembly frame, connecting rod, and sliding frame; Figure 6 This is a schematic diagram of the clamping structure; Figure 7 This is a schematic diagram of the exploded structure of the compression structure; Figure 8 A schematic diagram of the rotating spindle and locking assembly; Figure 9 This is a schematic diagram of the card strip structure; Figure 10 A cross-sectional view of the rotating spindle. Figure 11 This is an enlarged view of a portion of the rotating spindle's structure. Figure 12This is a structural diagram of the supporting components.

[0018] Legend: 1. Operating table; 2. Mounting base; 3. Three-jaw chuck; 4. Frame; 5. Lifting seat; 6. Welding machine; 71. Rotary spindle; 72. Fixed rod; 73. Mounting slot; 74. Sleeve; 81. Fixed frame; 82. Connecting rod; 83. Assembly frame; 84. Sliding frame; 85. First connecting arm; 86. Second connecting arm; 87. Slot; 88. Dual-axis motor; 89. Lead screw; 91. Horizontal plate; 92. Limiting slot ; 93. Movable frame; 94. Hole; 95. Positioning screw groove; 96. Positioning bolt; 97. Pressure plate; 98. Guide rail; 99. Slider; 101. Opening; 102. Locking strip; 103. Stop block; 104. First recess; 105. Second recess; 106. Elastic rib ring; 111. Through port; 112. Threaded rod; 113. Moving block; 114. Knob; 121. Cylinder; 122. Support base; 123. Roller. Detailed Implementation

[0019] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0020] This invention discloses a welding apparatus for automotive parts, with reference to... Figure 1-12 The system includes an operating table 1, on which a mounting base 2 is provided. A rotatable three-jaw chuck 3 is provided on the side of the mounting base 2. The mounting base 2 contains a drive module for driving the three-jaw chuck 3 to rotate. The drive module is existing technology and is not shown in the figure, so it will not be described in detail here. A frame 4 is fixed on the operating table 1. A lifting seat 5 is slidably provided on the frame 4. A welding machine 6 is provided on the side of the lifting seat 5. The welding machine 6 is used to perform welding operations on the exhaust pipe. The specific structure and working principle of the welding machine 6 are existing technology and will not be described in detail here.

[0021] A rotating assembly is provided above the operating table 1. The rotating assembly includes a rotating spindle 71, a fixed rod 72, a mounting groove 73, and a sleeve 74. One end of the rotating spindle 71 is connected to the fixed rod 72. The fixed rod 72 is inserted into the three-jaw chuck 3 and fixed by the three-jaw chuck 3. The mounting groove 73 is opened at the end of the rotating spindle 71 away from the fixed rod 72. The sleeve 74 is fixedly sleeved on the rotating spindle 71 and is located at the end of the rotating spindle 71 away from the fixed rod 72. Several protrusions are fixed on the outer surface of the rotating spindle 71. The protrusions are arranged in a circumferential array around the axis of the rotating spindle 71. The outer edge of the sleeve 74 has a circular structure.

[0022] Two positioning components are provided on the rotating spindle 71. One positioning component is fixed on the rotating spindle 71, and the other positioning component is slidably disposed on the rotating spindle 71. The positioning component includes a frame structure, two movable structures, three clamping structures and a drive structure. The frame structure includes two fixed frames 81, three connecting rods 82 and two assembly frames 83. The two fixed frames 81 are connected by the three connecting rods 82. The two fixed frames 81 and the three connecting rods 82 together form a cage-like frame structure. The two assembly frames 83 are fixedly sleeved on the connecting rods 82.

[0023] Each of the two fixed brackets 81 and the two assembly brackets 83 has several guide openings, which are respectively engaged with several protrusions on the rotating spindle 71. The guide openings and protrusions can improve the connection stability between the rotating spindle 71 and the positioning component. In addition, for the sliding positioning component, the guide openings allow the positioning component to rotate with the rotating spindle 71, preventing slippage. Each of the two fixed brackets 81 and the two assembly brackets 83 has two slots 87.

[0024] The movable structure includes a sliding frame 84, three first connecting arms 85, and three second connecting arms 86. The sliding frame 84 is slidably sleeved on the connecting rod 82 and is located between the fixed frame 81 and the assembly frame 83. One end of each of the three first connecting arms 85 is hinged to the assembly frame 83, and one end of each of the three second connecting arms 86 is hinged to the sliding frame 84. The other ends of the three second connecting arms 86 are respectively hinged to the three first connecting arms 85, forming a structure as shown in the figure. Figure 4 The state shown.

[0025] The clamping structure includes a horizontal plate 91, two limiting grooves 92, two movable frames 93, and two pressure plates 97. The horizontal plate 91 is arranged on one side of the rotating main shaft 71 and is parallel to the rotating main shaft 71. A guide rail 98 is fixed on the side of the horizontal plate 91, and two sliders 99 are slidably arranged on the guide rail 98. The two sliders 99 are respectively hinged to two adjacent first connecting arms 85. The two limiting grooves 92 are respectively opened on both sides of the horizontal plate 91, and the limiting grooves 92 are opened along the length direction of the horizontal plate 91. Both movable frames 93 are slidably mounted on the horizontal plate 91. Both ends of the movable frame 93 are provided with L-shaped lips, and the two lips slide in the two limiting grooves 92 respectively. The lip design can prevent the movable frame 93 from falling off the horizontal plate 91. Two pressure plates 97 are fixed on the two movable frames 93 respectively. The pressure plates 97 are made of rubber material, and the surface of the pressure plates 97 is provided with an arc surface. The arc surface design can increase the contact area between the pressure plates 97 and the inner wall of the exhaust pipe, and improve the clamping effect.

[0026] The surface of the horizontal plate 91 is provided with several positioning screw grooves 95, which are arranged in a straight array along the length of the horizontal plate 91. Both movable frames 93 are provided with holes 94, and each hole 94 is provided with a positioning bolt 96. The operator can adjust the position of the two movable frames 93 on the horizontal plate 91 according to the length of the exhaust pipe, so that the clamping structure can be adapted to exhaust pipes of different lengths.

[0027] The drive structure includes a dual-axis motor 88 and two lead screws 89. The dual-axis motor 88 is mounted on two mounting brackets 83. The two lead screws 89 are respectively fixed on the two output shafts of the dual-axis motor 88, and the two lead screws 89 rotate in opposite directions. The two lead screws 89 are threadedly connected to two sliding frames 84. When the dual-axis motor 88 is running, it drives the two lead screws 89 to rotate synchronously, thereby causing the two sliding frames 84 to move synchronously, so as to control the two sliding frames 84 to move closer or further apart. Since the sliding frames 84 are slidably sleeved on three connecting rods 82, the sliding frames 84 cannot rotate with the lead screws 89, and can only move linearly under the action of the lead screws 89.

[0028] A locking assembly is provided on the rotating spindle 71. The locking assembly is used to lock the position of the slidable positioning component. The locking assembly includes two openings 101, two retaining bars 102, two stops 103, four first recesses 104, two second recesses 105, and two elastic ribs 106. Both openings 101 are formed on the surface of the rotating spindle 71 and are connected to the mounting groove 73. The two retaining bars 102 are slidably disposed in the two openings 101 respectively, and the size of the retaining bars 102 is similar to that of the openings 101. The two stops 103 are fixed at the ends of the two clips 102 respectively, and both stops 103 are located inside the mounting groove 73. The stops 103 prevent the clips 102 from falling out of the opening 101. The four first recesses 104 are arranged in pairs and are respectively opened at both ends of the two clips 102. The two second recesses 105 are opened on the outer circumferential surface of the rotating spindle 71, and the two second recesses 105 correspond to the two ends of the opening 101 respectively. The two second recesses 105 are respectively connected to the two openings 101.

[0029] Two elastic reinforcing rings 106 are respectively arranged in two second sinkers 105, as follows: Figure 8 As shown, for the elastic rib 106, the elastic rib 106 can be inserted into the first recess 104 on the retaining strip 102. Under the action of the elastic rib 106, in the initial state, the two retaining strips 102 are respectively located inside the two openings 101, and the surface of the retaining strip 102 will not protrude from the opening 101. At this time, it can prevent the retaining strip 102 from blocking the smooth movement of the sliding positioning component. Under the action of the elastic rib 106, the two retaining strips 102 always have a tendency to move closer to each other, which is used for the automatic reset of the two retaining strips 102.

[0030] An adjustment assembly is provided on the rotating spindle 71. The adjustment assembly includes a port 111, a threaded rod 112, a movable block 113, and a knob 114. The port 111 is located at the end of the rotating spindle 71 away from the fixed rod 72 and is connected to the mounting groove 73. The threaded rod 112 is threaded into the port 111. One end of the threaded rod 112 is located inside the mounting groove 73, and the other end is located outside the rotating spindle 71. A movable block 113 is fixed to one end of the threaded rod 112 and is located inside the mounting groove 73. The movable block 113 has a conical structure and is directly opposite the gap between the two retaining strips 102. A knob 114 is fixed to the end of the threaded rod 112 away from the movable block 113. The knob 114 is designed to facilitate the operator to control the rotation of the threaded rod 112.

[0031] The operating table 1 is equipped with a support assembly, which includes a cylinder 121, a support base 122, and rollers 123. The cylinder 121 is installed on the top surface of the operating table 1, and the support base 122 is fixed to the telescopic end of the cylinder 121. The cross-section of the support base 122 is a semi-circular structure. Several rollers 123 are rotatably installed on the support base 122. The support base 122 is positioned directly opposite the sleeve 74, and each roller 123 is in contact with the surface of the sleeve 74. The arrangement of the support base 122 and the rollers 123 can provide support for the end of the rotating spindle 71 away from the three-jaw chuck 3, ensuring the coaxiality between the rotating spindle 71 and the three-jaw chuck 3, thereby ensuring welding accuracy.

[0032] In use, the operator places the large-sized mid-section muffler onto a fixed positioning component, which automatically centers and fixes the muffler. Then, the small-sized tailpipe is placed onto a slidable positioning component, which also automatically centers and fixes it. After positioning, the operator pulls the tailpipe towards the mid-section muffler until they are in contact. The operator then starts the welding machine 6 and simultaneously controls the three-jaw chuck 3 to rotate. The rotation of the three-jaw chuck 3 causes the mid-section muffler and tailpipe to rotate synchronously. During rotation, the welding machine 6 automatically completes the welding operation between the two. It should be noted that both the mid-section muffler and tailpipe are cylindrical structures. After positioning, the mid-section muffler, tailpipe, rotating spindle 71, and three-jaw chuck 3 remain coaxial, providing a basis for accurate welding.

[0033] The centering and clamping principle is as follows: After the operator places the exhaust pipe onto the positioning component, the dual-axis motor 88 is started. When the dual-axis motor 88 is running, it can drive the two lead screws 89 to rotate synchronously. When the two lead screws 89 rotate, they can drive the two sliding frames 84 to move synchronously and move closer to each other. When the sliding frames 84 move, they can apply force to the three second connecting arms 86. The force is transmitted to the three first connecting arms 85 through the three second connecting arms 86. Finally, the two adjacent first connecting arms 85 jointly drive the horizontal plate 91 to move. In summary, when the dual-axis motor 88 is running, the three horizontal plates 91 can move synchronously away from the rotating main shaft 71 to expand until the three clamping structures jointly press the inside of the exhaust pipe. Since the three horizontal plates 91 are arranged in a circumferential array around the rotating main shaft 71, the three horizontal plates 91 can automatically center and clamp the exhaust pipe when they expand, without the need for manual adjustment.

[0034] It is worth noting that the dual-axis motor 88 can be powered by a long wire. Since the rotating spindle 71 only rotates slowly 360° during a single welding operation, and the rotating spindle 71 will reverse and reset after welding, the wire will not get tangled on the rotating spindle 71. In addition, the guide rail 98 and slider 99 on the horizontal plate 91 enable the two first connecting arms 85 to drive the horizontal plate 91 to move smoothly. When the two first connecting arms 85 rotate synchronously, they will drive the two sliders 99 to slide synchronously on the two guide rails 98, avoiding motion interference.

[0035] After positioning the mid-section muffler and tailpipe, the operator pulls the tailpipe until it contacts the mid-section muffler. Then, the operator rotates knob 114. Rotating knob 114 causes the threaded rod 112 to rotate, which in turn moves the moving block 113. Figure 10 As shown, when the moving block 113 moves, it pushes the two locking strips 102. Since the moving block 113 has a conical structure, the two locking strips 102 will move away from each other when pushed by the moving block 113 and respectively lock into the corresponding slots 87 on the sliding positioning component. In this case, the two locking strips 102 together play a fixing role on the sliding positioning component. When the sliding positioning component is fixed, the position of the tail throat is fixed accordingly, which can prevent the tail throat from shifting during the welding process.

[0036] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A welding apparatus for automotive parts, characterized in that, include: Control panel (1); Mounting base (2) is fixed to the top surface of the operating table (1); A three-jaw chuck (3) is rotatably mounted on the side of the mounting base (2); The frame (4) is fixed to the top surface of the operating table (1); The lifting seat (5) is slidably mounted on the frame (4) and can slide along the height direction of the frame (4); The welding machine (6) is placed on the side of the lifting seat (5), and the welding machine (6) is located directly above the axis of the three-jaw chuck (3); A rotating assembly is arranged above the operating table (1) and connected to the three-jaw chuck (3). The rotating assembly includes a rotating spindle (71), which is a rod-shaped structure with several protrusions on its surface. Two positioning components are arranged on the rotating spindle (71). One of the positioning components is fixedly connected to the rotating spindle (71), and the other positioning component is slidably connected to the rotating spindle (71). The positioning component includes a frame structure, two movable structures, three clamping structures and a driving structure. A locking assembly is arranged on the rotating spindle (71); An adjustment component is arranged at one end of the rotating spindle (71) away from the three-jaw chuck (3). The adjustment component cooperates with the locking component to lock the slidable positioning component. A support assembly is arranged on the operating table (1) to provide support for the rotating spindle (71).

2. The welding apparatus for automotive parts according to claim 1, characterized in that, The rotating assembly further includes: A fixing rod (72) is fixed to one end of the rotating spindle (71), and its axis coincides with the axis of the rotating spindle (71); A mounting slot (73) is provided at the other end of the rotating spindle (71); The sleeve (74) is fixedly sleeved on the rotating spindle (71), and the outer edge of the cross section is circular, and its axis coincides with the axis of the rotating spindle (71).

3. The welding apparatus for automotive parts according to claim 1, characterized in that, The framework structure includes: Two mounting brackets (81) are positioned facing each other. Three connecting rods (82) are fixed between the two fixing frames (81); Two assembly frames (83) are fixed on the three connecting rods (82) and located between the two fixing frames (81). Two slots (87) are provided on both the two assembly frames (83) and the two fixing frames (81).

4. The welding apparatus for automotive parts according to claim 3, characterized in that, The activity structure includes: The sliding frame (84) is slidably sleeved on the three connecting rods (82) and located between the fixed frame (81) and the assembly frame (83); The three first connecting arms (85) are all hinged at one end to the assembly frame (83); The three second connecting arms (86) are each hinged at one end to the sliding frame (84) and at the other end to the three first connecting arms (85).

5. The welding apparatus for automotive parts according to claim 4, characterized in that, The clamping structure includes: A horizontal plate (91) is placed on one side of the rotating main shaft (71) and is parallel to the rotating main shaft (71); Two limiting grooves (92) are respectively opened on both sides of the horizontal plate (91) and arranged along the length direction of the horizontal plate (91); Two movable frames (93) are slidably mounted on the horizontal plate (91). Both ends of the movable frames (93) are provided with L-shaped lips, and the two lips slide in the two limiting grooves (92) respectively. Two pressure plates (97) are fixed on the two movable frames (93) respectively, and the surface of the pressure plates (97) is provided with an arc surface; The guide rail (98) is fixed to the side of the horizontal plate (91) facing the rotating spindle (71) and is arranged along the length of the horizontal plate (91). Two sliders (99) are slidably mounted on the guide rail (98) and are respectively hinged to the ends of the two adjacent first connecting arms (85) away from the mounting frame (83).

6. The welding apparatus for automotive parts according to claim 5, characterized in that, The surface of the horizontal plate (91) is provided with a plurality of positioning screw grooves (95), and the plurality of positioning screw grooves (95) are arranged in a straight array along the length direction of the horizontal plate (91). The two movable frames (93) are provided with holes (94), and the two holes (94) are provided with positioning bolts (96).

7. The welding apparatus for automotive parts according to claim 6, characterized in that, The driving structure includes: A dual-axis motor (88) is mounted on two of the aforementioned mounting brackets (83); Two lead screws (89) are fixed to the two output shafts of the dual-axis motor (88) respectively, and are parallel to the rotating main shaft (71). The two lead screws (89) are threadedly connected to the two sliding frames (84) respectively, and the two lead screws (89) have opposite rotation directions.

8. The welding apparatus for automotive parts according to claim 7, characterized in that, The locking component includes: Two openings (101) are both formed on the surface of the rotating spindle (71) and communicate with the mounting groove (73); Two clips (102) slide in the two openings (101) respectively; Two stops (103) are fixed to the sides of the two clips (102) respectively, and are located inside the mounting groove (73); Four first sinkers (104) are arranged in pairs at both ends of the two said card strips (102); Two second sinks (105) are both opened on the rotating main shaft (71) and communicate with the two openings (101); Two elastic ribs (106) are placed in the two second sinkers (105) respectively, and are engaged in the corresponding first sinkers (104).

9. The welding apparatus for automotive parts according to claim 8, characterized in that, The adjustment component includes: A through-hole (111) is provided at one end of the rotating spindle (71) away from the fixed rod (72) and communicates with the mounting groove (73); A threaded rod (112) passes through the port (111) and is threadedly connected to the port (111); The movable block (113) is fixed to one end of the threaded rod (112) located in the mounting groove (73), and has a conical structure, with its axis coinciding with the axis of the threaded rod (112). A knob (114) is fixed to one end of the threaded rod (112) located outside the mounting groove (73).

10. The welding apparatus for automotive parts according to claim 2, characterized in that, The support components include: A cylinder (121) is installed on the top surface of the operating table (1) and is arranged in the vertical direction; The support base (122) is fixed to the telescopic end of the cylinder (121), has a semi-circular cross-section, and is positioned directly opposite the sleeve (74). Several rollers (123) are rotatably mounted on the support (122) and are evenly distributed on the support (122).

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