Medium-frequency induction heating type metal pipe accurate bending device

Abstract

The invention discloses a medium-frequency induction heating type metal pipe precise bending device which comprises a heating furnace, a pushing table and a bending table are symmetrically distributed on the two sides of the heating furnace, a clamping piece for clamping a to-be-bent metal pipe is arranged on the bending table, and a clamping piece for clamping the to-be-bent metal pipe in the bending process is arranged on the clamping piece. The supporting piece is used for supporting the inner wall of the metal pipe, and a bending piece for bending the metal pipe is arranged on the bending table; according to the metal pipe bending device, through the supporting pieces, the supporting pieces are retained in the bending area, do not move along with the metal pipe and continuously provide internal support for the pipe wall by utilizing the magnetic adsorption force of the supporting blocks and the clamping blocks, the multiple sets of supporting blocks adapt to the bending track of the metal pipe through the universal joints, and the pipe wall is effectively prevented from being flattened or wrinkled or the ovality exceeds the standard in the bending process; the section roundness and the wall thickness uniformity of the bent pipe are guaranteed, the bending quality of the high-pressure pipeline is improved, meanwhile, magnetic connection is convenient to assemble and disassemble, and the operation efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of metal tube bending equipment technology, specifically a medium-frequency induction heating type precision metal tube bending device. Background Technology

[0002] Medium-frequency induction heating pipe bending technology, with its core advantages such as precise local heating, continuous forming, and small heat-affected zone, has become a key technology in the bending of large-diameter, thick-walled, high-pressure metal pipes. This process generates an alternating magnetic field through a medium-frequency power supply to efficiently heat the metal pipe locally. It can precisely control the heating area and temperature, avoiding problems such as excessive energy consumption and large overall deformation of the pipe caused by traditional integral heating methods. Its continuous forming characteristic can match the efficient operation rhythm of industrial production lines, and the advantage of a small heat-affected zone can preserve the basic mechanical properties of the metal pipe to the greatest extent, ensuring the pressure-bearing capacity and structural stability of the bent pipe. At present, this technology has been widely used in core engineering fields such as long-distance oil and gas pipelines, main steam pipelines of power plant boilers, and corrosion-resistant chemical pipelines, becoming an important technical support for ensuring the quality and safety of various high-pressure metal pipeline projects.

[0003] In existing medium-frequency induction heating pipe bending devices, most support structures in the metal pipe bending support stage tend to shift during the bending process as the metal pipe is pushed forward and bent. This results in a lack of continuous and stable support to the core bending area, leading to intermittent loss of support effect. At the same time, the shape of the existing support structure is relatively fixed, making it difficult to adapt to the changes in the bending trajectory of the metal pipe during the bending process. This can easily cause uneven local stress on the pipe wall at the bending point, which in turn leads to quality defects such as pipe wall flattening, wrinkling, or excessive ellipticity, affecting the roundness and wall thickness uniformity of the bent pipe cross-section. Summary of the Invention

[0004] The purpose of this invention is to address the problems in existing medium-frequency induction heating tube bending devices where, during the metal tube bending support process, most support structures tend to shift as the metal tube is pushed forward and bent, failing to provide continuous and stable support to the core bending area. This results in intermittent support effects. Furthermore, the fixed shape of existing support structures makes it difficult to adapt to changes in the bending trajectory of the metal tube during bending, easily causing uneven stress on the tube wall at the bending point. This leads to quality defects such as tube wall flattening, wrinkling, or excessive ellipticity, affecting the roundness and wall thickness uniformity of the bent tube cross-section. Therefore, this invention provides a medium-frequency induction heating precision metal tube bending device.

[0005] To achieve the above object, the present invention provides the following technical solutions: A precise bending device for medium-frequency induction heating of metal pipes, comprising: a heating furnace, a propulsion table and a bending table symmetrically distributed on both sides of the heating furnace, a clamping member for clamping the metal pipe to be bent is provided on the bending table, a supporting member for supporting the inner wall of the metal pipe during bending is provided on the clamping member, and a bending member for bending the metal pipe is provided on the bending table; A moving groove is formed through the top end of the bending table, a connecting plate is fixedly connected to the middle position inside the moving groove, a moving block is slidably connected inside the moving groove, a spring is fixedly arranged between the moving block and the connecting plate, a clamping block is fixedly connected to the top end of the moving block, and a magnetic block is embedded inside the clamping block; The supporting member includes a supporting block magnetically adsorbed and connected to the magnetic block inside the clamping block. The supporting block is cylindrical, and its diameter is adapted to the metal pipe to be bent. A magnetic block is embedded inside the supporting block. There are multiple groups of supporting blocks, and universal joints are fixedly connected between the multiple groups of supporting blocks.

[0006] As a further scheme of the present invention: The moving groove is arranged close to the heating furnace, the cross-section of the moving groove is cruciform, the moving block is T-shaped, the top ends of the moving block and the connecting plate are flush with the top end of the bending table, there are two groups of moving blocks, symmetrically distributed on both sides of the connecting plate, there are two groups of springs, symmetrically distributed on both sides of the connecting plate, a screw rod is arranged through the side end of the moving block, the screw rod is parallel to the moving groove, and the screw rod penetrates through the two groups of moving blocks and the connecting plate and is threadedly connected to the moving block and the connecting plate.

[0007] As a further scheme of the present invention: The propulsion table is also provided with a moving groove, a connecting plate, a moving block and a spring, and multiple groups of moving grooves are arranged on the propulsion table, evenly opened on the propulsion table. Synchronous blocks are fixedly connected to the bottom ends of the moving blocks on the propulsion table and the bending table. There are two groups of synchronous blocks, symmetrically distributed on both sides of the connecting plate, and each connecting plate is fixedly connected to the multiple groups of moving blocks on the same side.

[0008] As a further scheme of the present invention: Among the multiple groups of moving grooves on the propulsion table, an introducing member is arranged on the top end of the moving block in the group of moving grooves far from the heating furnace, and propulsion members are arranged on the top ends of the moving blocks in the remaining multiple groups of moving grooves on the propulsion table.

[0009] As a further scheme of the present invention: The propulsion member includes an installation box fixedly connected to the top end of the moving block. The opening of the installation box faces the side where the connecting plate is located. A propulsion roller is rotatably connected inside the installation box. The axis of the propulsion roller is consistent with the height direction of the installation box. The propulsion roller is in a Chinese character "zhong" shape, and the upper and lower ends of the Chinese character "zhong" shaped propulsion roller penetrate through the upper and lower ends of the installation box. A motor one is fixedly connected to the top end of the installation box, and the output end of the motor one is fixedly connected to the top end of the propulsion roller.

[0010] As a further embodiment of the present invention: the guide includes a mounting column fixedly connected to the top of the moving block, and a guide plate is fixedly connected to the mounting column on the side facing the connecting plate. The guide plates at the top of the two sets of moving blocks in a set of moving slots away from the heating furnace in the push platform are symmetrically distributed in a figure-eight shape. When the metal tube is pushed onto the push platform, the end face of the metal tube first abuts against the two sets of symmetrically distributed guide plates in a figure-eight shape, so that the guide plates move to both sides under the abutment action until the metal tube enters between the two sets of guide plates.

[0011] As a further embodiment of the present invention: the bending component includes a rotating groove formed at the top of the bending table, the rotating groove is provided in two sets, the two sets of rotating grooves are concentric semi-circular grooves, a push rod is provided at the bottom of the rotating groove, the push rod is F-shaped, the push rod passes through the rotating groove and is rotatably connected to the rotating groove, the top of the push rod is flush with the top of the bending table, and a push plate is fixedly connected to the top of the push rod.

[0012] As a further embodiment of the present invention: a mounting platform is fixedly connected to the bottom end of the bending table, one end of the push rod extends into the mounting platform, a second motor is fixedly connected to the bottom end of the mounting platform, the output end of the second motor passes through the mounting platform and is fixedly connected to the push rod, and two sets of bending components are provided, symmetrically distributed on both sides of the connecting plate, and the rotation grooves on the two sets of bending components are connected.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, the clamping distance can be flexibly adjusted by the clamping component to adapt to metal pipes of different diameters. At the same time, the synchronous block realizes the synchronous centering of the pushing table and the bending table, ensuring that the center of the metal pipe is accurately aligned with the heating furnace and the bending component, avoiding skewing during bending. The elasticity of the spring can buffer the clamping force to prevent damage to the pipe wall. The screw realizes positioning and ensures clamping stability, providing a reliable foundation for subsequent bending. 2. In this invention, the support component is used to retain the support component in the bending area by the magnetic attraction between the support block and the clamping block. It does not move with the metal pipe and continuously provides internal support to the pipe wall. Multiple sets of support blocks adapt to the bending trajectory of the metal pipe through universal joints, effectively preventing the pipe wall from being flattened, wrinkled, or having excessive ellipticity during bending. This ensures the roundness and uniformity of the pipe section and wall thickness, improves the bending quality of high-pressure pipelines, and the magnetic connection facilitates assembly and disassembly, greatly improving work efficiency. 3. In this invention, the bending component allows for selective unilateral force application as needed, enabling precise directional bending of the metal tube. The concentric semi-circular groove design ensures a stable bending trajectory. The second motor can precisely control the bending angle and speed, avoiding over-bending or under-bending. The two symmetrically arranged bending components enable bidirectional bending, improving the applicability of the device. Simultaneously, the push plate applies force in close contact with the metal tube, reducing local stress concentration and preventing tube wall cracking. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the clamping component in this invention; Figure 3 This is a bottom view of the structure of the clamping component in this invention; Figure 4 In this invention Figure 3 A schematic diagram of the structure at point C; Figure 5 In this invention Figure 2 A schematic diagram of the structure at point A; Figure 6 In this invention Figure 2 A schematic diagram of the structure at point B; Figure 7 This is a schematic diagram of the bending table in this invention; Figure 8 In this invention Figure 7 A schematic diagram of the structure at point D; Figure 9 This is a bottom view of the bending table structure in this invention; Figure 10 In this invention Figure 9 A schematic diagram of the structure at point E.

[0015] In the diagram: 1. Heating furnace; 2. Pushing platform; 3. Bending platform; 4. Clamping component; 41. Moving groove; 42. Connecting plate; 43. Moving block; 44. Spring; 45. Screw; 46. Clamping block; 47. Pushing component; 471. Mounting box; 472. Pushing roller; 473. Motor 1; 48. Inlet component; 481. Mounting column; 482. Guide plate; 49. Synchronizing block; 5. Support component; 51. Support block; 52. Universal joint; 6. Bending component; 61. Rotating groove; 62. Push rod; 63. Push plate; 64. Mounting platform; 65. Motor 2. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0018] Reference Figure 1 In this embodiment of the invention, a medium-frequency induction heating type metal tube precision bending device includes: a heating furnace 1, wherein the heating furnace 1 is a medium-frequency induction heating device, consisting of a capacitor bank, a copper busbar, an induction heating coil and a heating cavity. The capacitor bank and the coil are connected through the copper busbar to form a resonant circuit. After a medium-frequency current is applied, the coil generates an alternating magnetic field, causing the metal workpiece placed in the heating cavity to induce eddy currents, thereby achieving efficient heating. The heating furnace 1 is characterized by having a pusher platform 2 and a bending platform 3 symmetrically distributed on both sides. The bending platform 3 is provided with a clamping member 4 for clamping the metal tube to be bent, and a support member 5 for supporting the inner wall of the metal tube during the bending process is provided on the clamping member 4. The bending platform 3 is provided with a bending member 6 for bending the metal tube.

[0019] Reference Figures 2 to 4A moving groove 41 is provided through the top of the bending table 3. The moving groove 41 is located near the heating furnace 1. The moving groove 41 has a cross-shaped cross section. A connecting plate 42 is fixedly connected to the middle of the moving groove 41. A moving block 43 is slidably connected inside the moving groove 41. The moving block 43 is T-shaped. The tops of the moving block 43 and the connecting plate 42 are flush with the top of the bending table 3. Two sets of moving blocks 43 are provided, symmetrically distributed on both sides of the connecting plate 42. Springs 44 are fixedly provided between the moving blocks 43 and the connecting plate 42. Two sets of springs 44 are provided, symmetrically distributed on both sides of the connecting plate 42. In the initial state, the two sets of springs 44 pull the two sets of moving blocks 43, moving them towards the connecting plate 42, until the springs 44 retract to their limit position. A screw 45 is provided through the side end of the moving block 43. The screw 45 is parallel to the moving groove 41 and passes through the two sets of moving blocks. 43 and connecting plate 42 are threadedly connected to moving block 43 and connecting plate 42. A clamping block 46 is fixedly connected to the top of moving block 43. A magnetic block is embedded inside clamping block 46. Moving slot 41, connecting plate 42, moving block 43 and spring 44 are also provided on the push table 2. Multiple sets of moving slot 41 are provided on the push table 2 and are evenly opened on the push table 2. Synchronizing block 49 is fixedly connected to the bottom of moving block 43 on the push table 2 and bending table 3. Two sets of synchronizing blocks 49 are provided and are symmetrically distributed on both sides of connecting plate 42. Each set of connecting plate 42 is fixedly connected to multiple sets of moving blocks 43 on the same side. Among the multiple sets of moving slots 41 on the push table 2, the top of moving block 43 in the set of moving slots 41 away from heating furnace 1 is provided with guide member 48. The top of moving block 43 in the other multiple sets of moving slots 41 on the push table 2 is provided with push member 47.

[0020] The above scheme is adopted: by setting the moving groove 41, connecting plate 42, moving block 43, spring 44 and screw 45, the distance between the two sets of moving blocks 43 can be flexibly adjusted to adapt to metal pipes of different diameters. The synchronous block 49 realizes the synchronous movement of the moving blocks 43 on the pushing table 2 and bending table 3, ensuring that the center of the metal pipe is accurately aligned with the heating furnace 1 and bending part 6. The guide part 48 realizes the automatic centering and introduction of the metal pipe. The pushing part 47 realizes the stable and continuous pushing of the metal pipe, effectively improving the feeding accuracy and operation efficiency.

[0021] Reference Figures 5 to 6The propulsion component 47 includes a mounting box 471 fixedly connected to the top of the movable block 43. The opening of the mounting box 471 faces the side where the connecting plate 42 is located. A propulsion roller 472 is rotatably connected inside the mounting box 471. The axis of the propulsion roller 472 is aligned with the height direction of the mounting box 471. The propulsion roller 472 is U-shaped, and its upper and lower ends penetrate the upper and lower ends of the mounting box 471. A motor 473 is fixedly connected to the top of the mounting box 471. The output end of the motor 473 is fixedly connected to the top of the propulsion roller 472. An inlet component 48... The device includes a mounting column 481 fixedly connected to the top of the movable block 43. A guide plate 482 is fixedly connected to the mounting column 481 on the side facing the connecting plate 42. The guide plates 482 at the top of the two sets of movable blocks 43 in a set of movable slots 41 away from the heating furnace 1 in the push platform 2 are symmetrically distributed in a figure-eight shape. When the metal tube is pushed onto the push platform 2, the end face of the metal tube first abuts against the two sets of symmetrically distributed guide plates 482 in a figure-eight shape, causing the guide plates 482 to move to both sides under the abutment until the metal tube enters between the two sets of guide plates 482.

[0022] The above scheme is adopted: through the mounting box 471 of the pusher 47, the pusher roller 472 and the motor 473, the T-shaped pusher roller 472 is driven by its contact with the outer wall of the metal tube to avoid slippage during the push process and ensure the stability of the feeding. Through the mounting column 481 and the figure-eight guide plate 482 of the guide 48, the metal tube is automatically centered and guided, reducing manual calibration steps, improving loading efficiency and centering accuracy, and laying the foundation for subsequent precise bending.

[0023] Reference Figures 7 to 8 The support member 5 includes a support block 51 that is magnetically attracted to the magnetic block inside the clamping block 46. The support block 51 is cylindrical and its diameter is adapted to the metal tube to be bent. The support block 51 is embedded with a magnetic block. Multiple sets of support blocks 51 are provided, and universal joints 52 are fixedly connected between the multiple sets of support blocks 51. In the initial state, the support member 5 is placed from the side of the bending table 3 away from the heating furnace 1 into the metal tube that has been pushed onto the bending table 3. Until the set of support blocks 51 near the heating furnace 1 is magnetically attracted to the magnetic block inside the clamping block 46 through the magnetic block inside its internal magnetic block. As the metal tube is pushed forward, and because the magnetic attraction force between the support block 51 and the clamping block 46 is greater than the magnetic attraction force between the magnetic block and the metal tube, the support member 5 maintains its current position during the movement of the metal tube and does not move with the metal tube, so that the support member 5 is always stuck in the bending area.

[0024] The above solution is adopted: by using the support block 51 and universal joint 52 of the support member 5, the support member 5 is kept in the bending area by magnetic adsorption force and does not move with the metal pipe, continuously providing internal support for the pipe wall. Multiple sets of support blocks 51 adapt to the bending trajectory of the metal pipe through universal joint 52, effectively preventing the pipe wall from being flattened, wrinkled or exceeding the ellipticity standard during bending, ensuring the roundness and uniformity of the bent pipe cross section and improving the bending quality of high pressure pipeline.

[0025] Reference Figures 7 to 10 The bending component 6 includes a rotating groove 61 formed at the top of the bending table 3. Two sets of rotating grooves 61 are concentric semi-circular grooves. A push rod 62 is provided at the bottom of the rotating groove 61. The push rod 62 is F-shaped and passes through the rotating groove 61, rotatably connected to it. The top of the push rod 62 is flush with the top of the bending table 3. A push plate 63 is fixedly connected to the top of the push rod 62. A mounting platform 64 is fixedly connected to the bottom of the bending table 3. One end of the push rod 62... Extending into the mounting platform 64, a second motor 65 is fixedly connected to the bottom of the mounting platform 64. The output end of the second motor 65 passes through the mounting platform 64 and is fixedly connected to the push rod 62. Two sets of bending parts 6 are provided, symmetrically distributed on both sides of the connecting plate 42, and the rotating grooves 61 on the two sets of bending parts 6 are connected. According to the bending direction of the metal tube, the bending parts 6 on different sides are activated, so that one side of the metal tube abuts against the push plate 63 and the other side abuts against the clamping block 46, so that the metal tube is bent.

[0026] Using the above scheme: through the rotating groove 61 of the bending component 6, the push rod 62, the push plate 63, the mounting platform 64 and the second motor 65, the corresponding side motor 65 can be started according to the preset bending direction, driving the push plate 63 to rotate along the concentric semi-circular groove to apply force, so as to achieve precise directional bending of the metal tube. The two sets of symmetrically arranged bending components 6 can achieve bidirectional bending, improving the applicability of the device. At the same time, the second motor 65 can accurately control the bending angle and speed to avoid over-bending or under-bending.

[0027] The working principle of this invention is as follows: First, the end of the metal tube is pushed to the push platform 2, so that its end face abuts against the symmetrically distributed V-shaped guide plates 482. Under the action of the abutment force, the guide plates 482 on both sides are pushed, causing the moving block 43 to compress the spring 44 to move to both sides until the metal tube enters between the two sets of guide plates 482, realizing automatic centering and introduction. The synchronization block 49 ensures that the moving block 43 on the push platform 2 and the bending table 3 moves synchronously, so that the V-shaped push roller 472 of the push component 47 fits tightly against the outer wall of the metal tube, and the spring... The spring force of spring 44 can adaptively adjust the clamping force. Then, adjusting screw 45 locks the position of multiple sets of moving blocks 43 to ensure that the center of the metal tube is completely aligned with the center of heating furnace 1 and bending part 6. After loading and centering are completed, motor 473 of pusher 47 is started, driving push roller 472 to rotate and driving the metal tube to move towards heating furnace 1 at a constant speed. At the same time, heating furnace 1 is started. The capacitor bank and induction heating coil form a resonant circuit through the copper busbar. After the medium frequency current is applied, the coil generates an alternating magnetic field, which affects the metal tube. The tube is locally heated to a preset bending temperature. The heated area moves synchronously with the advancement of the metal tube, maintaining a localized hot bending state. As the metal tube continues to advance, one end of the metal tube enters the bending table 3. At this point, multiple sets of cylindrical support blocks 51 are connected into a continuous support member 5 via universal joints 52. This support member 5 is inserted into the metal tube to be bent from the side of the bending table 3 away from the heating furnace 1 until a set of support blocks 51 near the heating furnace 1 forms a magnetic attraction with the magnetic blocks inside the clamping block 46, thus completing the support member 5. Positioning: Because the magnetic attraction force between the support block 51 and the clamping block 46 is greater than the attraction force between the support block 5 and the metal tube, the support 5 remains in the bending area. Multiple sets of support blocks 51 adapt to the bending trajectory of the metal tube through the universal joint 52, continuously providing internal support for the tube wall and avoiding tube wall deformation during bending. According to the preset bending direction, the motor 65 of the corresponding side bending part 6 is started, driving the F-type push rod 62 to rotate along the concentric semi-circular rotating groove 61, driving the push plate 63 to apply force to the metal tube, causing the metal tube to bend in the heating area.The clamping distance can be flexibly adjusted by the clamping component 4 to adapt to metal pipes of different diameters. Simultaneously, the synchronous block 49 ensures synchronized alignment of the feeding platform 2 and the bending platform 3, guaranteeing precise alignment of the metal pipe center with the heating furnace 1 and the bending component 6, preventing skewing during bending. The spring force 44 buffers the clamping force, preventing damage to the pipe wall. The screw 45 provides positioning, ensuring clamping stability and providing a reliable foundation for subsequent bending. The support component 5, utilizing the magnetic attraction between the support block 51 and the clamping block 46, keeps the support component 5 stationary in the bending area, preventing it from moving with the metal pipe and continuously providing internal support to the pipe wall. Multiple sets of support blocks 51 are adaptively connected by universal joints 52. The bending trajectory of the pipe effectively prevents the pipe wall from being flattened, wrinkled, or exceeding the elliptic standard during bending, ensuring the roundness and uniformity of the pipe cross-section and improving the bending quality of high-pressure pipelines. Simultaneously, the magnetic connection facilitates assembly and disassembly, significantly improving work efficiency. The bending component 6 allows for selective unilateral force application as needed, achieving precise directional bending of the metal pipe. The concentric semi-circular groove design ensures a stable bending trajectory. Motor 65 precisely controls the bending angle and speed, avoiding over-bending or under-bending. Two symmetrically arranged bending components 6 enable bidirectional bending, enhancing the device's applicability. Simultaneously, the push plate 63 applies force in close contact with the metal pipe, reducing localized stress concentration and preventing pipe wall cracking.

[0028] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A medium-frequency induction heating type precision bending device for metal tubes, comprising: A heating furnace (1) is characterized in that a pusher platform (2) and a bending platform (3) are symmetrically distributed on both sides of the heating furnace (1). A clamping member (4) is provided on the bending platform (3) to clamp the metal tube to be bent. A support member (5) is provided on the clamping member (4) to support the inner wall of the metal tube during the bending process. A bending member (6) is provided on the bending platform (3) to bend the metal tube. The bending table (3) has a through-hole groove (41) at the top. A connecting plate (42) is fixedly connected to the middle position inside the groove (41). A moving block (43) is slidably connected inside the groove (41). A spring (44) is fixedly installed between the moving block (43) and the connecting plate (42). A clamping block (46) is fixedly connected to the top of the moving block (43). A magnetic block is embedded inside the clamping block (46). The support member (5) includes a support block (51) that is magnetically attracted to the magnetic block inside the clamping block (46). The support block (51) is cylindrical and its diameter is adapted to the metal tube to be bent. The support block (51) is embedded with a magnetic block. The support block (51) is provided in multiple sets, and a universal joint (52) is fixedly connected between the multiple sets of support blocks (51).

2. The medium-frequency induction heating type metal tube precision bending device according to claim 1, characterized in that, The moving groove (41) is located near the heating furnace (1). The moving groove (41) has a cross-shaped cross section. The moving block (43) is T-shaped. The top of the moving block (43) and the connecting plate (42) are flush with the top of the bending table (3). There are two sets of moving blocks (43) symmetrically distributed on both sides of the connecting plate (42). There are two sets of springs (44) symmetrically distributed on both sides of the connecting plate (42). A screw (45) is provided through the side end of the moving block (43). The screw (45) is parallel to the moving groove (41). The screw (45) passes through the two sets of moving blocks (43) and the connecting plate (42) and is threadedly connected to the moving block (43) and the connecting plate (42).

3. The medium-frequency induction heating type metal tube precision bending device according to claim 2, characterized in that, The push platform (2) is also provided with a moving groove (41), a connecting plate (42), a moving block (43) and a spring (44). The moving groove (41) on the push platform (2) is provided in multiple sets and is evenly opened on the push platform (2). The bottom end of the moving block (43) on the push platform (2) and the bending platform (3) is fixedly connected to a synchronization block (49). There are two sets of synchronization blocks (49) symmetrically distributed on both sides of the connecting plate (42). Each set of connecting plates (42) is fixedly connected to multiple sets of moving blocks (43) on the same side.

4. The medium-frequency induction heating type metal tube precision bending device according to claim 3, characterized in that, Among the multiple sets of moving slots (41) on the propulsion platform (2), the top of the moving block (43) in the set of moving slots (41) away from the heating furnace (1) is provided with an inlet (48), and the top of the moving block (43) in the other multiple sets of moving slots (41) on the propulsion platform (2) is provided with a propulsion component (47).

5. A medium-frequency induction heating type metal tube precision bending device according to claim 4, characterized in that, The pusher (47) includes a mounting box (471) fixedly connected to the top end of the moving block (43). The mounting box (471) opens towards the side where the connecting plate (42) is located. A pushing roller (472) is rotatably connected inside the mounting box (471). The axis of the pushing roller (472) is consistent with the height direction of the mounting box (471). The pushing roller (472) is in a Chinese character 'zhong' shape, and the upper and lower ends of the Chinese character 'zhong' shaped pushing roller (472) penetrate through the upper and lower ends of the mounting box (471). A first motor (473) is fixedly connected to the top end of the mounting box (471), and the output end of the first motor (473) is fixedly connected to the top end of the pushing roller (472).

6. The medium-frequency induction heating type metal tube precision bending device according to claim 5, characterized in that, The guiding member (48) includes a mounting column (481) fixedly connected to the top end of the moving block (43). A guiding plate (482) is fixedly connected to the mounting column (481) towards the side where the connecting plate (42) is located. The guiding plates (482) at the top ends of the two moving blocks (43) in the group of moving grooves (41) in the pusher table (2) that are far from the heating furnace (1) are symmetrically distributed in a shape like the Chinese character 'ba'. When the metal pipe is pushed onto the pusher table (2), the end face of the metal pipe first abuts against the two guiding plates (482) that are symmetrically distributed in a shape like the Chinese character 'ba', causing the guiding plates (482) to move to both sides under the abutting action until the metal pipe enters between the two guiding plates (482).

7. A medium-frequency induction heating type metal tube precision bending device according to claim 6, characterized in that, The bending member (6) includes rotating grooves (61) opened at the top end of the bending table (3). There are two sets of the rotating grooves (61), and the two sets of rotating grooves (61) are concentric semi-circular grooves. A push rod (62) is provided at the bottom end of the rotating groove (61). The push rod (62) is in an 'F' shape and penetrates through the rotating groove (61) and is rotatably connected to the rotating groove (61). The top end of the push rod (62) is flush with the top end of the bending table (3), and a push plate (63) is fixedly connected to the top end of the push rod (62).

8. A medium-frequency induction heating type metal tube precision bending device according to claim 7, characterized in that, A mounting table (64) is fixedly connected to the bottom end of the bending table (3). One end of the push rod (62) extends into the mounting table (64). A second motor (65) is fixedly connected to the bottom end of the mounting table (64). The output end of the second motor (65) penetrates through the mounting table (64) and is fixedly connected to the push rod (62). There are two sets of the bending members (6), which are symmetrically distributed on both sides of the connecting plate (42), and the rotating grooves (61) on the two sets of bending members (6) are connected.

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