Automobile exhaust system pipeline bending device

Abstract

The invention relates to an automobile exhaust system pipeline bending device which comprises an operation table, a connecting base is fixedly connected to the operation table, a connecting shaft is slidably connected between two sliding rods, a second connecting frame is fixedly connected to the connecting shaft, and two guide rods are fixedly connected to the second connecting frame. A lower sliding block and an upper sliding block are connected between the two guide rods in a sliding mode, fiber cotton is clamped to the lower sliding block and the upper sliding block, in the process of inserting the pipe, the end of the pipe is aligned to a gap between the lower sliding block and the upper sliding block, and in the process of pushing the pipe inwards, the fiber cotton is clamped to the lower sliding block and the upper sliding block. The outer wall of the pipe can be in sliding connection with the fiber cotton on the inner sides of the lower sliding block and the upper sliding block, and lubricating oil in the storage groove flows onto the fiber cotton through the holes, so that a layer of lubricating oil can be attached to the surface of the pipe, and the friction force between the pipe and the mold is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of pipe bending devices, in particular to an automobile exhaust system pipe bending device. BACKGROUND

[0002] The automobile exhaust system pipe is a channel system for collecting and discharging exhaust gas generated by engine combustion, and the exhaust pipe needs to be subjected to bending forming, welding assembly, polishing and other processing technologies during production. A bending device is usually used to accurately bend the exhaust pipe according to the design requirements of different vehicle models during the bending forming operation of the exhaust pipe.

[0003] However, the traditional bending device usually needs to align the pipe with the center line of the mold during use, and insert the pipe on the core shaft of the equipment along the center line direction, so as to prevent the pipe from being deformed, collapsed or excessively thinned at the bending part due to external force. Since the bending mechanism and the core shaft are fixed on the equipment by bolts, the position of the mold and the core shaft needs to be adjusted by repeatedly disassembling the bolts when operating pipes of different diameters, so as to ensure that the center lines of the two coincide, and the operation efficiency is low and the flexibility is poor. During the bending process, the pipe is directly inserted on the core shaft, the core shaft plays a guiding and supporting role on the pipe during the bending process, and the inner diameter of the pipe is usually larger than the outer diameter of the core shaft, so that the pipe is easy to shake during the bending process, which will affect the processing precision, surface quality of the pipe, and the equipment and mold, and the practicability is poor. The pipe is usually directly placed in the bending mechanism for bending operation during bending. However, since a large friction force is generated between the pipe and the mold during the pipe bending process, the pipe surface is easy to be scratched, worn or deformed due to excessive friction force, and the flexibility is poor. SUMMARY

[0004] In order to facilitate quick bending operation of the pipe and ensure the stability of the pipe during bending, and reduce the friction force between the pipe and the mold, the application provides an automobile exhaust system pipe bending device.

[0005] The automobile exhaust system pipe bending device provided by the application adopts the following technical scheme: The utility model provides an automobile exhaust system pipeline bending device, including operation platform, the adjusting structure of installing on operation platform, the bending structure of connecting on adjusting structure, lubricating structure of installing on operation platform, be located in the mandrel of operation platform, the lubricating structure includes connecting seat and the slide bar of being located in connecting seat both sides, fixedly connected with connecting seat on operation platform, one of the slide bar is fixedly connected with connecting seat, the top of another slide bar is threadedly connected with connecting seat, the connecting axle of slidingly connecting between two slide bars, the second connecting frame is fixedly connected on the connecting axle, two guide rods are fixedly connected on the second connecting frame, the lower slide block and the upper slide block are slidingly connected between two guide rods respectively, and the fiber cotton is clamped on the lower slide block and the upper slide block.

[0006] By adopting the above technical scheme, in the process of inserting the pipe, the end of the pipe is aligned with the gap between the lower slide block and the upper slide block, and in the process of pushing the pipe inward, the outer wall of the pipe is slidingly connected with the fiber cotton inside the lower slide block and the upper slide block, and the guide rollers on the connecting axle improve the stability of the pipe during movement.

[0007] Optionally, the end of the connecting axle is slidingly connected with a plug, a plurality of limiting holes are formed in one of the slide rods, the end of the plug and the adjacent limiting hole are clamped with each other, and the guide rollers are rotatably connected to the central position of the connecting axle.

[0008] By adopting the above technical scheme, when it is necessary to adjust the position of the connecting axle according to the pipe with different outer diameters, the plug can be pulled out of the limiting hole, and then the connecting axle is slid up and down along the slide rod, at this time, the connecting axle drives the second connecting frame and the lower slide block to move up and down, so that the height of the guide rollers and the lower slide block can be quickly adjusted, different outer diameters of the pipe can be adapted, and since the top of one of the slide rods is threadedly connected with the connecting seat, the height of the guide rollers can be accurately adjusted by rotating the slide rod, and the flexibility is high.

[0009] Optionally, the spring is fixedly connected between the bottom surface of the lower slide block and the second connecting frame, the storage groove is formed in the interior of the upper slide block, and the rubber cover is clamped on the top surface of the upper slide block.

[0010] By adopting the above technical scheme, the lubricating oil in the storage groove flows into the fiber cotton through the hole, so that a layer of lubricating oil can be attached to the surface of the pipe, and the rubber cover above the storage groove ensures the sealing property of the storage groove.

[0011] Optionally, the adjusting structure comprises a first mounting plate and two first guide rails fixedly connected to the first mounting plate, the outer wall of the operating table is fixedly connected with the first mounting plate, two first guide rails are slidably connected with a sliding plate, the outer wall of the operating table is fixedly connected with a mounting rack, the mounting rack is fixedly connected with a first hydraulic cylinder, the first hydraulic cylinder is fixedly connected between the telescopic end and the bottom of the sliding plate, one side of the sliding plate close to the outer side is fixedly connected with two second guide rails, two second guide rails are slidably connected with a support frame, the side edge of the sliding plate is fixedly connected with a connecting plate, the connecting plate is fixedly connected with a second hydraulic cylinder, and the second hydraulic cylinder is fixedly connected between the telescopic end and the support frame.

[0012] By adopting the above technical scheme, the support frame is driven to slide along the two second guide rails on the sliding plate through the second hydraulic cylinder on the connecting plate, so that the front and rear positions of the bending mechanism are effectively adjusted until the center lines of the mold and the mandrel on the bending mechanism coincide with each other, the pipe is conveniently placed between the mold and the mandrel, the subsequent bending operation of the pipe is facilitated, and the deformation of the pipe at the bending part due to external force is effectively prevented.

[0013] Optionally, the support frame is in a "T" shape structure, and the bending structure is installed on the support frame.

[0014] By adopting the above technical scheme, the support frame is arranged in a "T" shape structure, so that the subsequent installation of the bending mechanism is facilitated.

[0015] Optionally, the bending structure comprises a first rotating shaft and a first gear fixedly connected to the center position of the first rotating shaft, one end of the support frame is rotatably connected with the first rotating shaft, the bottom surface of the support frame is fixedly connected with a motor, the output shaft of the motor is fixedly connected with the bottom end of the first rotating shaft, the other end of the support frame is rotatably connected with a second rotating shaft, the center position of the second rotating shaft is fixedly connected with a second gear, a rack is slidably connected in the support frame, the two ends of the rack are respectively meshed with the first gear and the second gear, the top of the second rotating shaft is fixedly connected with a pipe bending mold, and a rotating frame is fixedly connected to the second rotating shaft.

[0016] By adopting the above technical scheme, the second rotating shaft drives the pipe bending mold and the rotating frame fixedly connected thereto to rotate, and the rotating frame drives the main clamp mold and the pipe bending mold to rotate synchronously, so that the pipe can be effectively bent, and the operation efficiency is high.

[0017] Optionally, the upper surface of the support frame is fixedly connected with an anti-wrinkle plate, one end of the anti-wrinkle plate close to the pipe bending mold is rotatably connected with the pipe bending mold, and the rotating frame is connected with a fixing structure.

[0018] Through the above technical scheme, the groove on the sliding block die can wrap the pipe material together with the groove on the anti-wrinkle plate, thereby improving the stability of the pipe material.

[0019] Optionally, the fixing structure comprises a third guide rail and a first driving plate slidably connected to the third guide rail, two third guide rails are fixedly connected to the rotating frame, a third hydraulic cylinder is fixedly connected to the inside of the rotating frame, the third hydraulic cylinder is fixedly connected between the extension end and the end of the first driving plate close to the outside, a supporting seat is fixedly connected to the first driving plate, and a main die holder is fixedly connected to the supporting seat.

[0020] Through the above technical scheme, the supporting seat drives the main die holder to move, and the main die holder clamps the pipe material together with the pipe bending die, thereby facilitating the subsequent bending operation of the pipe material and improving the firmness of the pipe material during fixing.

[0021] Optionally, a positioning structure is installed on the supporting frame, the positioning structure comprises a fourth guide rail and a second driving plate slidably connected to the fourth guide rail, two fourth guide rails are fixedly connected to the supporting frame, a fourth hydraulic cylinder is fixedly connected to the inside of the supporting frame, the fourth hydraulic cylinder is fixedly connected between the extension end and the second driving plate, a first connecting frame is fixedly connected to the second driving plate, a second mounting plate is arranged on the back of the first connecting frame, a fifth hydraulic cylinder is fixedly connected to the first connecting frame, the fifth hydraulic cylinder is fixedly connected between the extension end and the end of the second mounting plate, and a sliding block die is fixedly connected to the second mounting plate.

[0022] Through the above technical scheme, the fifth hydraulic cylinder installed on the first connecting frame can drive the second mounting plate and the fifth guide rail to move during the bending process, and the second mounting plate drives the sliding block die to move, the sliding block die is in close contact with the pipe material at all times during the process, can make the pipe material bear force evenly, and can reduce the generation of bending defects such as wrinkles and cracks, and has strong practicability.

[0023] Optionally, two fifth guide rails are fixedly connected to the second mounting plate, and the first connecting frame is slidably connected to the fifth guide rails.

[0024] Through the above technical scheme, the fifth guide rails on the second mounting plate are slidably connected to the first connecting frame, thereby improving the stability during sliding.

[0025] In summary, the present application has at least one of the following beneficial technical effects: 1. When different sizes of pipe materials are bent, the center lines of the die and the mandrel need to be calibrated, the center lines of the two are avoided from being calibrated by disassembling the bolts to adjust the installation position, the calibration efficiency is improved, the operation is simple, the pipe material is avoided from being subjected to uneven force during bending, and the bending precision of the pipe material is improved. 2. In the process of bending the pipe, the fiber cotton inside the upper and lower sliding blocks and the outer wall of the pipe slide, thereby facilitating the application of lubricating oil on the outer wall of the pipe through the fiber cotton, reducing the friction between the pipe and the mold, enabling the pipe to slide more smoothly in the mold when bending, reducing resistance, avoiding scratches, wear or deformation of the pipe surface due to excessive friction, and the guide roller supporting the pipe, improving stability. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the application; Figure 2 It is a schematic diagram of the connection structure of the first connecting frame and the sliding block mold; Figure 1 It is an enlarged schematic diagram of the A part shown; Figure 3 It is a schematic diagram of the connection structure of the first connecting frame and the sliding block mold; Figure 4 It is a schematic diagram of the connection structure of the support frame and the fourth guide rail; Figure 5 It is a schematic diagram of the connection structure of the support frame and the first rotating shaft; Figure 6 It is a schematic diagram of the connection structure of the connecting seat and the sliding rod; Figure 7 It is a schematic diagram of the connection structure of the connecting shaft and the guide roller; Figure 8 It is a schematic diagram of the connection structure of the connecting shaft and the guide roller; Figure 7 It is an enlarged schematic diagram of the B part shown.

[0027] Mark No.: 1, operation table; 2, adjusting structure; 201, first mounting plate; 202, first guide rail; 203, sliding plate; 204, mounting frame; 205, first hydraulic cylinder; 206, second guide rail; 207, support frame; 208, connecting plate; 209, second hydraulic cylinder; 3, bending structure; 301, first rotating shaft; 302, first gear; 303, motor; 304, second rotating shaft; 305, second gear; 306, rack; 307, pipe bending die; 308, rotating frame; 309, anti-wrinkle plate; 4, fixing structure; 401, third guide rail; 402, first driving plate; 403, support seat; 404, main clamping die; 405, third hydraulic cylinder; 5, positioning structure; 501, fourth guide rail; 502, second driving plate; 503, fourth hydraulic cylinder; 504, first connecting frame; 505, second mounting plate; 506, fifth guide rail; 507, fifth hydraulic cylinder; 508, sliding block die; 6, lubricating structure; 601, connecting seat; 602, sliding rod; 603, connecting shaft; 604, guide roller; 605, limiting hole; 606, bolt; 607, second connecting frame; 608, guide rod; 609, lower sliding block; 610, spring; 611, upper sliding block; 612, fiber cotton; 613, storage groove; 614, rubber cover; 7, mandrel. DETAILED DESCRIPTION

[0028] The following will be described in detail with reference to the accompanying drawings. Figures 1-8 The application is further described in detail.

[0029] The application discloses a pipe bending device for automobile exhaust system. Figure 1 , Figure 6 , Figure 7 and Figure 8 The pipe bending device for automobile exhaust system comprises an operation table 1, an adjusting structure 2 mounted on the operation table 1, a bending structure 3 connected to the adjusting structure 2, a lubricating structure 6 mounted on the operation table 1, and a mandrel 7 arranged on the operation table 1, so that the mandrel 7 is inserted into the inside of a pipe. In the process of aligning the pipe with the center line direction of the upper die of the bending mechanism and inserting the pipe into the direction of the mandrel 7 and pushing the pipe inward, the outer wall of the pipe is slidably connected between the lower sliding block 609 and the upper sliding block 611 and the fiber cotton 612 on the inner side, and the lower sliding block 609 slides upward along the two guide rods 608 under the elastic force of the spring 610, thereby driving the lower sliding block 609 to abut against the pipe, the lubricating oil in the storage groove 613 flows into the fiber cotton 612 through the hole, so that a layer of lubricating oil can be attached to the surface of the pipe, and the setting of the rubber cover 614 above the storage groove 613 ensures the sealing property of the storage groove 613.

[0030] Refer to Figure 1 , Figure 2 , Figure 4 andFigure 5 The outer wall of the operation table 1 is fixedly connected with a first mounting plate 201, and a sliding plate 203 is slidably connected between two first guide rails 202 on the first mounting plate 201. When the position of the bending mechanism is adjusted, the first hydraulic cylinder 205 on the mounting frame 204 drives the sliding plate 203 to slide upwards along the two first guide rails 202 on the first mounting plate 201, thereby effectively adjusting the height of the bending mechanism.

[0031] Referring to Figure 2 , Figure 4 and Figure 5 , the center of the second rotating shaft 304 is fixedly connected with a second gear 305, the inside of the support frame 207 is slidably connected with a rack 306, the two ends of the rack 306 are respectively engaged with the first gear 302 and the second gear 305, the top of the second rotating shaft 304 is fixedly connected with a pipe bending die 307, and the second rotating shaft 304 is fixedly connected with a rotating frame 308. The first rotating shaft 301 drives the first gear 302 to rotate, the first gear 302 drives the rack 306 to slide outward of the support frame 207, the rack 306 drives the second gear 305 and the second rotating shaft 304 to rotate, at this time the second rotating shaft 304 simultaneously drives the pipe bending die 307 and the rotating frame 308 fixedly connected therewith to rotate, and the rotating frame 308 drives the main clamping die 404 to synchronously rotate with the pipe bending die 307, at this time the pipe can be effectively bent, and the operation efficiency is high.

[0032] Referring to Figure 2 , Figure 3 , Figure 4 and Figure 5 , the first driving plate 402 is fixedly connected with a support seat 403, and the support seat 403 is fixedly connected with a main clamping die 404. During the movement of the sliding block die 508, the third hydraulic cylinder 405 simultaneously drives the first driving plate 402 to move along the third guide rail 401 towards the pipe, the first driving plate 402 drives the support seat 403 to move, and the support seat 403 drives the main clamping die 404 to move, at this time the main clamping die 404 clamps the pipe in cooperation with the pipe bending die 307, thereby facilitating subsequent bending operation of the pipe and improving the firmness of the pipe during fixing.

[0033] Referring to Figure 2 , Figure 3 , Figure 4 and Figure 5A first connecting frame 504 is fixedly connected to the second drive plate 502, and two fifth guide rails 506 are fixedly connected to the second mounting plate 505. The first connecting frame 504 and the fifth guide rails 506 are slidably connected. A fifth hydraulic cylinder 507 is fixedly connected to the first connecting frame 504. The telescopic end of the fifth hydraulic cylinder 507 is fixedly connected to the end of the second mounting plate 505. A slider mold 508 is fixedly connected to the second mounting plate 505. After the tube is placed between the mold and the mandrel 7, the first connecting frame 504 drives the slider mold 508 to contact the tube. At the same time, during the bending process, the fifth hydraulic cylinder 507 installed on the first connecting frame 504 can drive the second mounting plate 505 and the fifth guide rail 506 to move. The second mounting plate 505 drives the slider mold 508 to move. During this process, the slider mold 508 is always in close contact with the tube, which can make the tube bear the force evenly and reduce the occurrence of bending defects such as wrinkles and cracks. It is highly practical.

[0034] This application discloses an implementation principle of an automotive exhaust system pipe bending device: Before bending the pipe, the position of the bending mechanism on the operating table 1 needs to be adjusted according to the size of the pipe to be bent. The mandrel 7 on the operating table 1 allows it to be inserted into the pipe, providing support and guidance. When bending, the pipe will move around the mandrel 7. The mandrel 7 can prevent the pipe from deforming, collapsing, or becoming excessively thin, guiding the pipe along a predetermined bending path and ensuring the accuracy of the bending angle and bending radius. When adjusting the position of the bending mechanism, the first hydraulic cylinder 2 on the mounting bracket 204 is used. 05 Drive the slide plate 203 to slide upward along the two first guide rails 202 on the first mounting plate 201, thereby effectively adjusting the height of the bending mechanism. Then, drive the support frame 207 to slide along the two second guide rails 206 on the slide plate 203 through the second hydraulic cylinder 209 on the connecting plate 208, thereby effectively adjusting the front and rear position of the bending mechanism until the center line of the mold on the bending mechanism coincides with the center line of the mandrel 7, which makes it easy to place the tube between the mold and the mandrel 7, which facilitates the subsequent bending operation of the tube. At the same time, it can effectively prevent the tube from deforming due to external force at the bending part. Next, align the tube with the center line of the mold on the bending mechanism and insert it towards the mandrel 7, so that the mandrel 7 is inserted into the tube. During the insertion process, align the end of the tube with the gap between the lower slider 609 and the upper slider 611. As the tube is pushed inward, the outer wall of the tube will slide against the fiber cotton 612 inside the lower slider 609 and the upper slider 611. Since the lubricating oil inside the storage tank 613 flows into the fiber cotton 612 through the holes, a layer of lubricating oil can be attached to the surface of the tube. The rubber cover 614 above the storage tank 613 ensures the sealing of the storage tank 613. Under the elastic force of the spring 610, the lower slider 609 slides upward along the two guide rods 608, thereby bringing... The sliding block 609 presses against the pipe, and the guide roller 604 on the connecting shaft 603 improves the stability of the pipe during movement. When it is necessary to adjust the position of the connecting shaft 603 according to the pipe with different outer diameters, simply pull the pin 606 out of the limiting hole 605, and then slide the connecting shaft 603 up and down along the slide rod 602. At this time, the connecting shaft 603 drives the second connecting frame 607 and the sliding block 609 to move up and down, which facilitates quick adjustment of the height of the guide roller 604 and the sliding block 609, making it easy to adapt to pipes with different outer diameters. Since the top of one of the slide rods 602 is threadedly connected to the connecting seat 601, it is easy to precisely adjust the height of the guide roller 604 by rotating the slide rod 602, which is highly flexible. After the tube is placed between the mold and the mandrel 7, it needs to be fixed. First, the fourth hydraulic cylinder 503 drives the second drive plate 502 to slide along the fourth guide rail 501 towards the tube. The second drive plate 502 drives the first connecting frame 504 to move. The first connecting frame 504 drives the slider mold 508 to abut against the tube. At this time, the groove on the slider mold 508 cooperates with the groove on the anti-wrinkle plate 309 to wrap around the tube. At the same time, during the bending process, the fifth hydraulic cylinder 507 installed on the first connecting frame 504 can drive the second mounting plate 505 and the fifth guide rail 506 to move. The second mounting plate 505 drives the slider mold 508 to abut against the tube. The block mold 508 moves, and during this process, the slider mold 508 is always in close contact with the tube, which can make the tube bear the force evenly and reduce the occurrence of bending defects such as wrinkles and cracks. It is highly practical. During the movement of the slider mold 508, the third hydraulic cylinder 405 will simultaneously drive the first drive plate 402 to move along the third guide rail 401 towards the tube. The first drive plate 402 drives the support base 403 to move, and the support base 403 drives the main clamping mold 404 to move. At this time, the main clamping mold 404 cooperates with the bending mold 307 to clamp the tube, which is conducive to the subsequent bending operation of the tube and improves the firmness of the tube when it is fixed. After the pipe is fixed, the motor 303 at the bottom of the support frame 207 drives the first rotating shaft 301 to rotate. The first rotating shaft 301 drives the first gear 302 to rotate. The first gear 302 drives the rack 306 to slide to the outside of the support frame 207. The rack 306 drives the second gear 305 and the second rotating shaft 304 to rotate. At this time, the second rotating shaft 304 simultaneously drives the bending mold 307 and the rotating frame 308 fixedly connected to it to rotate. The rotating frame 308 drives the main clamping mold 404 to rotate synchronously with the bending mold 307. At this time, the pipe can be effectively bent, and the operation efficiency is high.

[0035] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bending device for automotive exhaust system pipes, characterized in that, Includes an operating table (1), an adjustment structure (2) mounted on the operating table (1), a bending structure (3) connected to the adjustment structure (2), a lubrication structure (6) mounted on the operating table (1), and a spindle (7) provided on the operating table (1); The lubrication structure (6) includes a connecting seat (601) and slide rods (602) on both sides of the connecting seat (601). The operating table (1) is fixedly connected to the connecting seat (601). One of the slide rods (602) is fixedly connected to the connecting seat (601), and the top end of the other slide rod (602) is threadedly connected to the connecting seat (601). A connecting shaft (603) is slidably connected between the two slide rods (602). A second connecting frame (607) is fixedly connected to the connecting shaft (603). Two guide rods (608) are fixedly connected to the second connecting frame (607). A lower slide block (609) and an upper slide block (611) are slidably connected between the two guide rods (608). Fiber cotton (612) is engaged on both the upper slide block (611) and the lower slide block (609).

2. The automotive exhaust system pipe bending device according to claim 1, characterized in that: The end of the connecting shaft (603) is slidably connected to a pin (606), and one of the slide rods (602) is provided with multiple limiting holes (605). The end of the pin (606) is engaged with the adjacent limiting hole (605). The center position of the connecting shaft (603) is rotatably connected to a guide roller (604).

3. The automotive exhaust system pipe bending device according to claim 1, characterized in that: A spring (610) is fixedly connected between the bottom surface of the lower slider (609) and the second connecting frame (607). A storage slot (613) is provided inside the upper slider (611). A rubber cover (614) is engaged on the top surface of the upper slider (611).

4. The automotive exhaust system pipe bending device according to claim 1, characterized in that: The adjustment structure (2) includes a first mounting plate (201) and two first guide rails (202) fixedly connected to the first mounting plate (201). The first mounting plate (201) is fixedly connected to the outer wall of the operating table (1). A slide plate (203) is slidably connected between the two first guide rails (202). A mounting frame (204) is fixedly connected to the outer wall of the operating table (1). A first hydraulic cylinder (205) is fixedly connected to the mounting frame (204). The telescopic end of the first hydraulic cylinder (205) is fixedly connected to the bottom of the slide plate (203). Two second guide rails (206) are fixedly connected to the outer side of the slide plate (203). A support frame (207) is slidably connected between the two second guide rails (206). A connecting plate (208) is fixedly connected to the side of the slide plate (203). A second hydraulic cylinder (209) is fixedly connected to the connecting plate (208). The telescopic end of the second hydraulic cylinder (209) is fixedly connected to the support frame (207).

5. The automotive exhaust system pipe bending device according to claim 4, characterized in that: The support frame (207) has a "T" shaped structure, and a bending structure (3) is installed on the support frame (207).

6. The automotive exhaust system pipe bending device according to claim 5, characterized in that: The bending structure (3) includes a first rotating shaft (301) and a first gear (302) fixedly connected to the center position of the first rotating shaft (301). One end of the support frame (207) is rotatably connected to the first rotating shaft (301). A motor (303) is fixedly connected to the bottom surface of the support frame (207). The output shaft of the motor (303) is fixedly connected to the bottom end of the first rotating shaft (301). The other end of the support frame (207) is rotatably connected to a second rotating shaft (304). A second gear (305) is fixedly connected to the center position of the second rotating shaft (304). A rack (306) is slidably connected inside the support frame (207). The two ends of the rack (306) mesh with the first gear (302) and the second gear (305) respectively. A bending mold (307) is fixedly connected to the top of the second rotating shaft (304). A rotating frame (308) is fixedly connected to the second rotating shaft (304).

7. A bending device for automotive exhaust system pipes according to claim 6, characterized in that: The upper surface of the support frame (207) is fixedly connected to an anti-wrinkle plate (309), and one end of the anti-wrinkle plate (309) near the bending mold (307) is rotatably connected to the bending mold (307). The rotating frame (308) is connected to a fixed structure (4).

8. The automotive exhaust system pipe bending device according to claim 7, characterized in that: The fixed structure (4) includes a third guide rail (401) and a first drive plate (402) slidably connected to the third guide rail (401). Two third guide rails (401) are fixedly connected to the rotating frame (308). A third hydraulic cylinder (405) is fixedly connected inside the rotating frame (308). The telescopic end of the third hydraulic cylinder (405) is fixedly connected to one end of the first drive plate (402) near the outer side. A support base (403) is fixedly connected to the first drive plate (402). A main clamping mold (404) is fixedly connected to the support base (403).

9. A bending device for automotive exhaust system pipes according to claim 7, characterized in that: The support frame (207) is equipped with a positioning structure (5), which includes a fourth guide rail (501) and a second drive plate (502) slidably connected to the fourth guide rail (501). Two fourth guide rails (501) are fixedly connected to the support frame (207). A fourth hydraulic cylinder (503) is fixedly connected inside the support frame (207). The telescopic end of the fourth hydraulic cylinder (503) is fixedly connected to the second drive plate (502). A first connecting frame (504) is fixedly connected to the second drive plate (502). A second mounting plate (505) is provided on the back of the first connecting frame (504). A fifth hydraulic cylinder (507) is fixedly connected to the first connecting frame (504). The telescopic end of the fifth hydraulic cylinder (507) is fixedly connected to the end of the second mounting plate (505). A slider mold (508) is fixedly connected to the second mounting plate (505).

10. A bending device for an automotive exhaust system pipe according to claim 9, characterized in that: Two fifth guide rails (506) are fixedly connected to the second mounting plate (505), and the first connecting bracket (504) is slidably connected to the fifth guide rails (506).

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