A pipe bending device for a vehicle

Abstract

The application belongs to the technical field of pipe bending equipment, and discloses a steel pipe bending device for automobile. The steel pipe bending device for automobile comprises a machine table, a pipe feeding mechanism arranged on the machine table, a pipe feeding and clamping assembly and a mandrel assembly for pipe clamping and feeding, a pipe bending table, a rotating table movably installed on the upper surface of the pipe bending table through a bearing, a driving member installed on the pipe bending table for driving the rotating table, a positioning assembly installed on the side wall of the rotating table for pipe positioning during bending, and a pipe bending die installed on the upper surface of the rotating table for bending and guiding the pipe. The steel pipe bending device for automobile provides internal support for the pipe through the design of the mandrel assembly and the core ring module, and provides internal stretch shaping after bending through the shaping assembly, so as to eliminate the tiny wrinkles generated during bending, improve the roundness of the bent part of the pipe, and solve the problems in the background technology.

Description

Technical Field

[0001] This invention relates to the technical field of pipe bending equipment, specifically to a steel pipe bending device for automobiles. Background Technology

[0002] Pipe bending machines are widely used in various industries, such as automobile manufacturing, aerospace, construction, and petrochemicals. They can be used to make pipes, pipelines, pipe supports, etc., in various curved shapes. The advantages of pipe bending machines include high efficiency, precision, and stability. They can meet complex bending requirements and improve production efficiency and product quality.

[0003] After bending, the pipe will exhibit an elliptical deformation at the bend. Controlling the amount of deformation is the key to improving the quality of pipe bending. Existing technologies typically use a mandrel and a pressing die to position the pipe inside and outside to reduce undesirable deformation at the bend. However, the stability of controlling undesirable deformation during the processing of different pipes is not high. The adjustment of the pressing die and the mandrel are variables that affect stability. In actual processing, we found that there is still room for improvement. Therefore, we propose a steel pipe bending device for automobiles. Summary of the Invention

[0004] The purpose of this invention is to provide a steel pipe bending device for automobiles, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a steel pipe bending device for automobiles, comprising a machine base, wherein a pipe feeding mechanism is provided on the machine base, the pipe feeding mechanism comprising a clamping and feeding assembly for clamping and feeding pipe fittings and a mandrel assembly, and further comprising:

[0006] A pipe bending table, which is installed at one end of the machine tool;

[0007] A turntable, which is movably mounted on the upper surface of the bending table via bearings;

[0008] A drive unit, which is mounted on a pipe bending platform for driving a turntable;

[0009] A positioning component, which is installed on the side wall of the turntable for positioning the pipe during bending processing;

[0010] A pipe bending die, which is mounted on the upper surface of a turntable for guiding the bending of pipe fittings;

[0011] The mandrel assembly includes:

[0012] A drive assembly is mounted on the other end of the upper surface of the machine base;

[0013] A connection box, which is mounted on the movable end of the drive assembly;

[0014] The mandrel, one end of which is fixedly mounted on the side wall of the connecting box, is driven by the drive assembly to perform reciprocating motion along its axis through the connecting box;

[0015] A flexible tie rod, one end of which is fixedly connected to the other end of a core rod;

[0016] A core ring module, which is mounted on a flexible tie rod to provide internal support when the pipe is bent;

[0017] A shaping component, which is disposed at the other end of the flexible tie rod, is used to shape the bend in the pipe fitting after bending.

[0018] The shaping assembly includes a positioning disc assembly, mounting rings, mounting rods, positioning rings, shaped blocks, pull ropes, and branch ropes. The positioning disc assembly is fixedly connected to the other end of the flexible pull rod. Two mounting rings are sequentially arranged on the flexible pull rod between the bending mold and the positioning disc assembly. The mounting rings are regular polygonal rings with their centers coinciding with the axis of the flexible pull rod. The bends in the inner walls of the mounting rings are fixedly connected to the outer walls of the positioning rings via the mounting rods. The positioning rings are fixedly fitted onto the outer walls of the flexible pull rods. Several shaped blocks are movably connected to the mounting rings. The pull rope is located inside the cavity of the flexible pull rod. Several branch ropes are fixedly connected to the pull rope, and each branch rope passes through the flexible pull rod and the positioning rings and is fixedly connected to the corresponding shaped block. Pulling the shaped block to rotate it allows it to contact the inner wall of the pipe fitting, and then pulling the mandrel shapes the bends in the pipe fitting.

[0019] Preferably, the positioning component includes a positioning platform, a linear drive module, and a positioning mold. The positioning platform is fixedly installed on the side wall of the turntable, the linear drive module is installed in a groove on the upper surface of the positioning platform, and the axis of the linear drive module points to the central axis of the turntable. The positioning mold is fixedly installed on the slider of the linear drive module through a mounting seat.

[0020] Preferably, the drive assembly includes a mounting bracket, guide rails, a sliding plate, a first drive cylinder, and a second drive cylinder. The mounting bracket is fixedly mounted on the other end of the upper surface of the machine platform. Two vertical guide rails are installed parallel to each other on the side of the mounting bracket away from the pipe-feeding assembly. A sliding plate is slidably connected between the two guide rails. The first drive cylinder is mounted on the top wall of the mounting bracket, and its output end is fixedly connected to the upper surface of the sliding plate. The second drive cylinder is mounted on the side of the sliding plate away from the pipe-feeding assembly, and its output end passes through the sliding plate and is fixedly connected to a connecting box.

[0021] Preferably, a protective shell is installed on the machine platform between the clamping and feeding tube assembly and the turntable. A hydraulic lifting cylinder is installed at the bottom of the machine platform via a bracket. The output end of the hydraulic lifting cylinder extends to the upper side of the machine platform and is fixedly connected to a lifting platform. The lifting platform is located inside the protective shell. A guide platform and a medium-frequency heating module are installed sequentially on the lifting platform. The mandrel passes through the guide platform and the medium-frequency heating module.

[0022] Preferably, the shaping component further includes a rotating sleeve, a stop block, and a tensioning cylinder. Several rotating sleeves are movably mounted on the mounting ring, and the rotating sleeves are arranged alternately with the mounting rod. The rotating sleeves are fixedly fitted into the holes on the irregular block so that the irregular block can rotate on the mounting ring. A stop block is fixedly connected to the side wall of the irregular block so that the irregular block can be limited by the contact between the stop block and the mounting rod when it rotates. The end of the pull rope away from the flexible pull rod extends into the connecting box. The output end of the tensioning cylinder installed on the side wall of the connecting box is fixedly connected to the pull rope.

[0023] Preferably, the positioning disk assembly includes a positioning disk, a limiting ring, a limiting block, a tension spring, an arc-shaped oil cavity, a guide groove, a guide piston head, an arc-shaped top block, a hydraulic oil pipe, and a diverter valve. One side of the positioning disk is fixedly connected to the other end of the flexible pull rod, and the inner cavity of the positioning disk communicates with the inner cavity of the flexible pull rod. The inner wall of the positioning disk is fixedly connected to the limiting ring via a pad block at the position corresponding to the pull rope. One end of the pull rope passes through the limiting ring and is fixedly connected to the limiting block. The limiting block is fixedly connected to the inner wall of the positioning disk via a tension spring. Several arc-shaped oil cavities are formed inside the positioning disk and arranged in a ring with the positioning disk axis as a reference. The hydraulic oil pipe is located inside the flexible pull rod and communicates with each arc-shaped oil cavity via a diverter valve. The guide groove is formed on the inner wall of the arc-shaped oil cavity. A guide piston head is inserted into the guide groove. One end of the arc-shaped top block is fixedly connected to the side of the guide piston head away from the arc-shaped oil cavity. The other end of the arc-shaped top block passes through the side wall of the positioning disk to its outer side.

[0024] Preferably, the flexible pull rod is further provided with an air extraction pipe and a heat dissipation pipe. An air extraction hole is opened on the side of the positioning plate near the core ring module. The air extraction pipe is connected to each air extraction hole. Several air blowing holes are opened on the flexible pull rod between the mounting ring and the positioning plate. The heat dissipation pipe is connected to each air blowing hole to blow out cold air. The ends of the air extraction pipe, the heat dissipation pipe and the hydraulic oil pipe away from the positioning plate all pass through the core rod to the connecting box and are connected to the external equipment.

[0025] Preferably, the two mounting rings are parallel and angularly offset, so that the irregular blocks on the two mounting rings are staggered.

[0026] By adopting the aforementioned technical solution, the beneficial effects of the present invention are:

[0027] 1. This automotive steel pipe bending device, through the design of the mandrel assembly, utilizes the mandrel module to provide internal support for the pipe and the shaping assembly to provide internal pulling and shaping for the pipe after bending, thereby eliminating the micro-wrinkles generated during the bending process, improving the roundness of the pipe bending point, and solving the problems mentioned in the background art.

[0028] 2. This automotive steel pipe bending device utilizes a shaping component design. After the pipe is bent by medium-frequency heating, a mandrel pulls a positioning plate and a shaped block across the bend to externally support and shape the pipe, improving its roundness. Furthermore, the design incorporates an extraction pipe and a cooling pipe. After the shaping is completed by the shaped block, cold air is introduced into the pipe through the cooling pipe, while the extraction pipe removes the hot air after heat exchange, enabling rapid cooling of the pipe. The overall structure is simple and efficiently shapes the bends in the pipe, solving the problems mentioned in the background technology. Attached Figure Description

[0029] Figure 1 This invention is three-dimensional. Figure 1 ;

[0030] Figure 2 This invention is three-dimensional. Figure 2 ;

[0031] Figure 3 This is a schematic diagram of the structure of the shaping component of the present invention;

[0032] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0033] Figure 5 This is a cross-sectional view of the shaping component of the present invention;

[0034] Figure 6 For the present invention Figure 5 Enlarged view of point B in the middle;

[0035] Figure 7 For the present invention Figure 5 Enlarged view of point C in the middle;

[0036] Figure 8 For the present invention Figure 5 Enlarged view of point D in the middle;

[0037] Figure 9 This is a cross-sectional view of the connecting box of the present invention.

[0038] In the diagram: 1. Machine base; 2. Lifting platform; 3. Clamping and feeding tube assembly; 4. Mandrel assembly; 41. Drive assembly; 411. Mounting bracket; 412. Guide rail; 413. Sliding plate; 414. Drive cylinder one; 415. Drive cylinder two; 42. Connecting box; 43. Mandrel; 44. Flexible tie rod; 45. Core ring module; 46. Shaping assembly; 461. Positioning plate assembly; 4611. Positioning plate; 4612. Limiting ring; 4613. Limiting block; 4614. Tension spring; 4615. Arc-shaped oil cavity; 4616. Guide groove; 4617. Guide piston head; 4618. Arc-shaped top block; 461 9. Hydraulic oil pipe; 46110. Diverter valve; 462. Mounting ring; 463. Mounting rod; 464. Positioning ring; 465. Rotating sleeve; 466. Irregular block; 467. Stop block; 468. Pull rope; 469. Branch rope; 4610. Tensioning cylinder; 5. Bending platform; 6. Turntable; 7. Drive component; 8. Positioning assembly; 81. Positioning table; 82. Linear drive module; 83. Positioning mold; 9. Bending mold; 10. Protective shell; 11. Guide platform; 12. Medium frequency heating module; 13. Air extraction pipe; 14. Cooling pipe; 15. Air extraction hole; 16. Air blowing hole; 17. Hydraulic lifting cylinder. Detailed Implementation

[0039] Please see Figure 1-9 This invention provides a technical solution: a steel pipe bending device for automobiles, including a machine base 1, on which a pipe feeding mechanism is provided. The pipe feeding mechanism includes a clamping and feeding assembly 3 and a mandrel assembly 4 for clamping and feeding pipes. The clamping and feeding assembly 3 mainly includes a drive structure, which usually has XYZ three-axis adjustment function and can clamp, push and rotate pipes. It is widely used in pipe bending equipment. As well-known technology, it will not be described in detail. A bending table 5 is installed at one end of the machine base 1. A turntable 6 is movably installed on the upper surface of the bending table 5 through bearings. A drive component 7 is installed on the bending table 5 to drive the turntable 6. The drive component 7 can be a geared motor. A positioning assembly 8 is installed on the side wall of the turntable 6 for positioning the pipes during bending. A bending die 9 is installed on the upper surface of the turntable 6 for guiding the bending of the pipes.

[0040] The mandrel assembly 4 includes a drive assembly 41, which is installed on the other end of the upper surface of the machine base 1. A connecting box 42 is installed on the movable end of the drive assembly 41. One end of the mandrel 43 is fixedly installed on the side wall of the connecting box 42. The drive assembly 41 drives the mandrel 43 to reciprocate along its axial direction through the connecting box 42. One end of the flexible pull rod 44 is fixedly connected to the other end of the mandrel 43. The core ring module 45 is installed on the flexible pull rod 44 to provide internal support when the pipe is bent. The shaping assembly 46 is set at the other end of the flexible pull rod 44 for shaping the bend after the pipe is bent.

[0041] The positioning assembly 8 includes a positioning platform 81, a linear drive module 82, and a positioning mold 83. The positioning platform 81 is fixedly installed on the side wall of the turntable 6. The linear drive module 82 is installed in a groove on the upper surface of the positioning platform 81, and the axis of the linear drive module 82 points to the central axis of the turntable 6. The positioning mold 83 is fixedly installed on the slider of the linear drive module 82 through a mounting seat. The positioning mold 83 is pushed by the linear drive module 82 to realize the clamping and release of the pipe.

[0042] The drive assembly 41 includes a mounting bracket 411, guide rails 412, a sliding plate 413, a drive cylinder 414, and a drive cylinder 415. The mounting bracket 411 is fixedly mounted on the other end of the upper surface of the machine base 1. Two vertical guide rails 412 are installed parallel to each other on the side of the mounting bracket 411 away from the clamping and feeding tube assembly 3. The sliding plate 413 is slidably connected between the two guide rails 412. The drive cylinder 414 is mounted on the top wall of the mounting bracket 411 and its output end is fixedly connected to the upper surface of the sliding plate 413. The drive cylinder 415 is mounted on the side of the sliding plate 413 away from the clamping and feeding tube assembly 3, and the output end of the drive cylinder 415 passes through the sliding plate 413 and is fixedly connected to a connecting box 42.

[0043] A protective shell 10 is installed on the machine base 1 between the clamping and feeding tube assembly 3 and the turntable 6. A hydraulic lifting cylinder 17 is installed at the bottom of the machine base 1 via a bracket. The output end of the hydraulic lifting cylinder 17 extends to the upper side of the machine base 1 and is fixedly connected to a lifting platform 2. The lifting platform 2 is inside the protective shell 10. A guide table 11 and a medium-frequency heating module 12 are installed on the lifting platform 2 in sequence. The mandrel 43 passes through the guide table 11 and the medium-frequency heating module 12.

[0044] The shaping component 46 includes a positioning plate assembly 461, a mounting ring 462, a mounting rod 463, a positioning ring 464, a rotating sleeve 465, a shaped block 466, a stop block 467, a pull rope 468, and a branch rope 469. The positioning plate assembly 461 is fixedly connected to the other end of the flexible pull rod 44. Two mounting rings 462 are sequentially arranged on the flexible pull rod 44 between the bending die 9 and the positioning plate assembly 461. The mounting rings 462 are regular polygonal rings, and their centers coincide with the axis of the flexible pull rod 44. The bends in the inner wall of the mounting rings 462 are connected by the mounting rod. 463 is fixedly connected to the outer wall of the positioning ring 464. The positioning ring 464 is fixedly sleeved on the outer wall of the flexible tie rod 44. Several rotating sleeves 465 are movably mounted on the mounting ring 462, and the rotating sleeves 465 and the mounting rod 463 are arranged alternately. The rotating sleeves 465 are fixedly sleeved in the holes on the irregular block 466, allowing the irregular block 466 to rotate on the mounting ring 462. A stop block 467 is fixedly connected to the side wall of the irregular block 466, so that when the irregular block 466 rotates, it can be limited by the contact between the stop block 467 and the mounting rod 463. Please refer to [link / reference]. Figure 3The distance between the irregular block 466 and the rotating sleeve 465 varies. As the irregular block 466 rotates, its outer side will contact the inner wall of the pipe to form resistance. When the irregular block 466 passes the bend of the pipe, the shaping purpose can be achieved. The pull rope 468 is located in the inner cavity of the flexible pull rod 44. Several branch ropes 469 are fixedly connected to the pull rope 468, and each branch rope 469 passes through the flexible pull rod 44 and the positioning ring 464 and is fixedly connected to the corresponding irregular block 466. Pulling the irregular block 466 to rotate can make it contact the inner wall of the pipe and then pull the mandrel 43 to shape the bend of the pipe. The end of the pull rope 468 away from the flexible pull rod 44 extends into the connecting box 42. The output end of the tensioning cylinder 4610 installed on the side wall of the connecting box 42 is fixedly connected to the pull rope 468.

[0045] The two mounting rings 462 are parallel and offset at an angle, so that the irregular blocks 466 on the two mounting rings 462 are staggered;

[0046] It should be noted that you should refer to [link / reference]. Figure 3 Because there are gaps between the irregular blocks 466 on a single mounting ring 462, the staggered design of the irregular blocks 466 on two mounting rings 462 can ensure that the inner wall of the pipe fitting and the irregular blocks 466 are in full contact as much as possible to achieve the desired shape.

[0047] The positioning disk assembly 461 includes a positioning disk 4611, a limiting ring 4612, a limiting block 4613, a tension spring 4614, an arc-shaped oil cavity 4615, a guide groove 4616, a guide piston head 4617, an arc-shaped top block 4618, a hydraulic oil pipe 4619, and a flow divider valve 46110. One side of the positioning disk 4611 is fixedly connected to the other end of the flexible pull rod 44, and the inner cavity of the positioning disk 4611 communicates with the inner cavity of the flexible pull rod 44. The inner wall of the positioning disk 4611, corresponding to the position of the pull rope 468, is fixedly connected to the limiting ring 4612 via a pad. One end of the pull rope 468 passes through the limiting ring 4612 and is fixedly connected to the limiting block 4613. The limiting block 4613 is fixedly connected to the inner wall of the positioning disk 4611 via the tension spring 4614. A series of arc-shaped oil chambers 4615 are formed within the positioning plate 4611 and arranged in a ring with reference to the axis of the positioning plate 4611. Hydraulic oil pipes 4619 are located within the flexible tie rod 44 and are connected to each arc-shaped oil chamber 4615 through a diverter valve 46110. A guide groove 4616 is formed on the inner wall of the arc-shaped oil chamber 4615. A guide piston head 4617 is inserted into the guide groove 4616. The guide piston head 4617 is used to transmit pressure. To ensure sealing, a necessary sealing structure should be installed on the guide piston head 4617. As this is a well-known technology, it will not be described in detail. One end of an arc-shaped top block 4618 is fixedly connected to the side of the guide piston head 4617 away from the arc-shaped oil chamber 4615. The other end of the arc-shaped top block 4618 passes through the side wall of the positioning plate 4611 to its outer side.

[0048] The flexible pull rod 44 is also equipped with an air extraction pipe 13 and a heat dissipation pipe 14. An air extraction hole 15 is provided on the side of the positioning plate 4611 near the core ring module 45. The air extraction pipe 13 is connected to each air extraction hole 15. Several air blowing holes 16 are provided on the flexible pull rod 44 between the mounting ring 462 and the positioning plate 4611. The heat dissipation pipe 14 is connected to each air blowing hole 16 to blow out cold air. The air extraction pipe 13, the heat dissipation pipe 14, and the hydraulic oil pipe 4619 are located away from the positioning plate 4611. All ends pass through the mandrel 43 to the connecting box 42 and are connected to external equipment. The heat dissipation pipe 14 is connected to low-temperature gas, with the cooled inert gas being the best. The extraction pipe 13 is connected to an external extraction pump to recover and reuse the inert gas. The hydraulic oil pipe 4619 is connected to an external hydraulic system, which provides pressure to make the arc-shaped top block 4618 extend out of the positioning plate 4611. The extension length of the arc-shaped top block 4618 corresponds to different inner diameters of the pipe fittings. The appropriate length of the arc-shaped top block 4618 should be selected according to the processing.

[0049] When this equipment is working, the pipe fitting is inserted into the clamping and feeding assembly 3, so that the mandrel assembly 4 is inside the pipe fitting. In the processing preparation stage, the clamping and feeding assembly 3 feeds the bending part of the pipe fitting into the medium frequency heating module 12 for heating. After heating is completed, the pipe fitting is sent between the positioning assembly 8 and the bending die 9. The linear drive module 82 drives the positioning die 83 to clamp the pipe fitting. The drive cylinder 415 pushes the mandrel 43 so that the mandrel module 45 is in the part of the pipe fitting to be bent. The drive unit 7 drives the turntable 6 to rotate and bend the pipe fitting. Subsequently, the tensioning cylinder 4610 pulls the pull rope 468. The pull rope 468 drives the branch rope 469 to pull the shaped block 466 to rotate. The outer wall of the shaped block 466 contacts the inner wall of the pipe fitting. The external hydraulic equipment supplies hydraulic oil to the hydraulic pipe. Pressurization within 4619 causes the arc-shaped top block 4618 to be ejected, and each arc-shaped top block 4618 contacts the inner wall of the pipe fitting, causing the flexible pull rod 44 to coincide with the axis of the pipe fitting. Then, the drive cylinder 415 pulls back the mandrel 43, causing the irregular block 466 to pass through the bend of the pipe fitting. The pipe fitting is rounded and shaped from the inside. Then, cold air is introduced through the heat dissipation pipe 14. The cold air is directly sprayed into the inner wall of the pipe fitting through the air blowing hole 16. The hot air generated after heat exchange enters the air extraction pipe 13 through the air extraction hole 15 and is extracted and discharged. Then, the positioning plate 4611 passes through the bend of the pipe fitting, and the arc-shaped top block 4618 performs the final shaping of the bend of the pipe fitting. After the shaping is completed, the positioning component 8 releases the pipe fitting, and the clamping and feeding pipe component 3 operates the pipe fitting to perform the next bending or releasing of the pipe fitting.

[0050] Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A steel pipe bending device for automobiles, comprising a machine base, wherein a pipe feeding mechanism is provided on the machine base, the pipe feeding mechanism comprising a pipe clamping and feeding assembly and a mandrel assembly for clamping and feeding pipe fittings, characterized in that, Also includes: A pipe bending table, which is installed at one end of the machine tool; A turntable, which is movably mounted on the upper surface of the bending table via bearings; A drive unit, which is mounted on a pipe bending platform for driving a turntable; A positioning component, which is installed on the side wall of the turntable for positioning the pipe during bending processing; A pipe bending die, which is mounted on the upper surface of a turntable for guiding the bending of pipe fittings; The mandrel assembly includes: A drive assembly is mounted on the other end of the upper surface of the machine base; A connection box, which is mounted on the movable end of the drive assembly; The mandrel, one end of which is fixedly mounted on the side wall of the connecting box, is driven by the drive assembly to reciprocate along its axial direction through the connecting box; A flexible tie rod, one end of which is fixedly connected to the other end of a core rod; A core ring module, which is mounted on a flexible tie rod to provide internal support when the pipe is bent; A shaping component, which is disposed at the other end of the flexible tie rod, is used to shape the bend in the pipe fitting after bending. The shaping assembly includes a positioning disc assembly, mounting rings, mounting rods, positioning rings, shaped blocks, pull ropes, and branch ropes. The positioning disc assembly is fixedly connected to the other end of the flexible pull rod. Two mounting rings are sequentially arranged on the flexible pull rod between the bending mold and the positioning disc assembly. The mounting rings are regular polygonal rings with their centers coinciding with the axis of the flexible pull rod. The bends in the inner walls of the mounting rings are fixedly connected to the outer walls of the positioning rings via the mounting rods. The positioning rings are fixedly fitted onto the outer walls of the flexible pull rods. Several shaped blocks are movably connected to the mounting rings. The pull rope is located inside the cavity of the flexible pull rod. Several branch ropes are fixedly connected to the pull rope, and each branch rope passes through the flexible pull rod and the positioning rings and is fixedly connected to the corresponding shaped block. Pulling the shaped block to rotate it allows it to contact the inner wall of the pipe fitting, and then pulling the mandrel shapes the bends in the pipe fitting.

2. The automotive steel pipe bending device according to claim 1, characterized in that: The positioning assembly includes a positioning platform, a linear drive module, and a positioning mold. The positioning platform is fixedly installed on the side wall of the turntable. The linear drive module is installed in a groove on the upper surface of the positioning platform, and the axis of the linear drive module points to the central axis of the turntable. The positioning mold is fixedly installed on the slider of the linear drive module through a mounting seat.

3. The steel pipe bending device for automobiles according to claim 2, characterized in that: The drive assembly includes a mounting bracket, guide rails, a sliding plate, a first drive cylinder, and a second drive cylinder. The mounting bracket is fixedly mounted on the other end of the upper surface of the machine platform. Two vertical guide rails are installed parallel to each other on the side of the mounting bracket away from the pipe-feeding assembly. A sliding plate is slidably connected between the two guide rails. The first drive cylinder is mounted on the top wall of the mounting bracket and its output end is fixedly connected to the upper surface of the sliding plate. The second drive cylinder is mounted on the side of the sliding plate away from the pipe-feeding assembly, and its output end passes through the sliding plate and is fixedly connected to a connecting box.

4. The steel pipe bending device for automobiles according to claim 3, characterized in that: A protective shell is installed on the machine platform between the clamping and feeding tube assembly and the turntable. A hydraulic lifting cylinder is installed at the bottom of the machine platform via a bracket. The output end of the hydraulic lifting cylinder extends to the upper side of the machine platform and is fixedly connected to a lifting platform, which is located inside the protective shell. A guide platform and a medium-frequency heating module are installed sequentially on the lifting platform, and the mandrel passes through the guide platform and the medium-frequency heating module.

5. The steel pipe bending device for automobiles according to claim 4, characterized in that: The shaping assembly also includes a rotating sleeve, a stop block, and a tensioning cylinder. Several rotating sleeves are movably mounted on the mounting ring, and the rotating sleeves are arranged alternately with the mounting rod. The rotating sleeves are fixedly fitted into the holes on the irregular block, allowing the irregular block to rotate on the mounting ring. A stop block is fixedly connected to the side wall of the irregular block, so that the irregular block can be limited by contact with the mounting rod when it rotates. The end of the pull rope away from the flexible pull rod extends into the connecting box. The output end of the tensioning cylinder installed on the side wall of the connecting box is fixedly connected to the pull rope.

6. The steel pipe bending device for automobiles according to claim 5, characterized in that: The positioning disk assembly includes a positioning disk, a limiting ring, a limiting block, a tension spring, an arc-shaped oil cavity, a guide groove, a guide piston head, an arc-shaped top block, a hydraulic oil pipe, and a diverter valve. One side of the positioning disk is fixedly connected to the other end of the flexible pull rod, and the inner cavity of the positioning disk communicates with the inner cavity of the flexible pull rod. The inner wall of the positioning disk is fixedly connected to the limiting ring via a pad block at the position corresponding to the pull rope. One end of the pull rope passes through the limiting ring and is fixedly connected to the limiting block. The limiting block is fixedly connected to the inner wall of the positioning disk via a tension spring. Several arc-shaped oil cavities are opened in the positioning disk and arranged in a ring with the positioning disk axis as a reference. The hydraulic oil pipe is located in the flexible pull rod and communicates with each arc-shaped oil cavity via a diverter valve. The guide groove is opened on the inner wall of the arc-shaped oil cavity. A guide piston head is inserted into the guide groove. One end of the arc-shaped top block is fixedly connected to the side of the guide piston head away from the arc-shaped oil cavity. The other end of the arc-shaped top block passes through the side wall of the positioning disk to its outer side.

7. The steel pipe bending device for automobiles according to claim 6, characterized in that: The flexible tie rod is also equipped with an air extraction pipe and a heat dissipation pipe. An air extraction hole is opened on the side of the positioning plate near the core ring module. The air extraction pipe is connected to each air extraction hole. Several air blowing holes are opened on the flexible tie rod between the mounting ring and the positioning plate. The heat dissipation pipe is connected to each air blowing hole to blow out cold air. The ends of the air extraction pipe, the heat dissipation pipe and the hydraulic oil pipe away from the positioning plate all pass through the core rod to the connecting box and are connected to the external equipment.

8. The steel pipe bending device for automobiles according to claim 5, characterized in that: The two mounting rings are parallel and angularly offset, causing the irregular blocks on the two mounting rings to intersect.

Images