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CN-122007220-A - Medium frequency induction heating type metal tube accurate bending device

CN122007220ACN 122007220 ACN122007220 ACN 122007220ACN-122007220-A

Abstract

The invention discloses an intermediate frequency induction heating type metal pipe accurate bending device which comprises a heating furnace, wherein a pushing table and a bending table are symmetrically distributed on two sides of the heating furnace, clamping pieces for clamping a metal pipe to be bent are arranged on the bending table, supporting pieces for supporting the inner wall of the metal pipe in the bending process are arranged on the clamping pieces, bending pieces for bending the metal pipe are arranged on the bending table, the supporting pieces are retained in a bending area by utilizing the magnetic adsorption force of supporting blocks and the clamping blocks and do not move along with the metal pipe, internal support is continuously provided for the pipe wall, a plurality of groups of supporting blocks are adaptive to the bending track of the metal pipe by a universal joint, the pipe wall is effectively prevented from being flattened, wrinkled or over-standard in terms of ellipticity during bending, the roundness and wall thickness uniformity of the section of the bent pipe are ensured, the bending quality of the high-pressure pipe is improved, meanwhile, the magnetic connection is convenient to assemble and disassemble, and the operation efficiency is greatly improved.

Inventors

  • XU LINXIANG

Assignees

  • 河北锦航管道设备制造有限公司

Dates

Publication Date
20260512
Application Date
20260325

Claims (8)

  1. 1. The medium-frequency induction heating type metal tube accurate bending device comprises a heating furnace (1), and is characterized in that a pushing table (2) and a bending table (3) are symmetrically distributed on two sides of the heating furnace (1), a clamping piece (4) for clamping a metal tube to be bent is arranged on the bending table (3), a supporting piece (5) for supporting the inner wall of the metal tube in the bending process is arranged on the clamping piece (4), and a bending piece (6) for bending the metal tube is arranged on the bending table (3); The bending table (3) is characterized in that a moving groove (41) is formed in the top end of the bending table in a penetrating mode, a connecting plate (42) is fixedly connected to the middle position inside the moving groove (41), a moving block (43) is connected in a sliding mode in the moving groove (41), a spring (44) is fixedly arranged between the moving block (43) and the connecting plate (42), a clamping block (46) is fixedly connected to the top end of the moving block (43), and a magnetic block is embedded in the clamping block (46); The support piece (5) comprises a support block (51) which is magnetically adsorbed and connected with the magnetic blocks in the clamping blocks (46), the support block (51) is cylindrical, the diameter of the support block is matched with a metal pipe to be bent, the magnetic blocks are embedded in the support block (51), the support block (51) is provided with a plurality of groups, and universal joints (52) are fixedly connected between the plurality of groups of support blocks (51).
  2. 2. The precise bending device for the medium-frequency induction heating type metal tube according to claim 1, wherein the moving groove (41) is formed in a position close to the heating furnace (1), the cross section of the moving groove (41) is in a cross shape, the moving block (43) is in a T shape, the top ends of the moving block (43) and the connecting plate (42) are flush with the top end of the bending table (3), the moving block (43) is provided with two groups and symmetrically distributed on two sides of the connecting plate (42), the springs (44) are provided with two groups and symmetrically distributed on two sides of the connecting plate (42), a screw rod (45) is arranged at the side end of the moving block (43) in a penetrating mode, the screw rod (45) is parallel to the moving groove (41), and the screw rod (45) penetrates through the two groups of the moving block (43) and the connecting plate (42) and is in threaded connection with the moving block (43) and the connecting plate (42).
  3. 3. The precise bending device for the medium-frequency induction heating type metal tube according to claim 2, wherein the moving grooves (41), the connecting plates (42), the moving blocks (43) and the springs (44) are also arranged on the pushing table (2), a plurality of groups of moving grooves (41) are arranged on the pushing table (2), the moving blocks (43) on the pushing table (2) and the bending table (3) are uniformly arranged on the bottom ends of the moving blocks (43), the synchronizing blocks (49) are provided with two groups and symmetrically distributed on two sides of the connecting plates (42), and each group of connecting plates (42) is fixedly connected with the same-side groups of moving blocks (43).
  4. 4. The precise bending device for the metal tube with the medium-frequency induction heating type according to claim 3, wherein among a plurality of groups of moving grooves (41) on the pushing table (2), an introduction piece (48) is arranged at the top end of a moving block (43) in one group of moving grooves (41) far away from the heating furnace (1), and a pushing piece (47) is arranged at the top end of the moving block (43) in the other groups of moving grooves (41) on the pushing table (2).
  5. 5. The precise bending device for the metal tube with the medium-frequency induction heating function according to claim 4, wherein the pushing member (47) comprises a mounting box (471) fixedly connected with the top end of the moving block (43), an opening of the mounting box (471) faces to one side where the connecting plate (42) is located, a pushing roller (472) is rotationally connected to 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 middle-square shape, the upper end and the lower end of the middle-square-shaped pushing roller (472) penetrate through the upper end and the lower end of the mounting box (471), a motor I (473) is fixedly connected to the top end of the mounting box (471), and the output end of the motor I (473) is fixedly connected with the top end of the pushing roller (472).
  6. 6. The precise bending device for the metal tube through medium frequency induction heating according to claim 5, wherein the guiding piece (48) comprises a mounting column (481) fixedly connected with the top end of the moving block (43), a guide plate (482) is fixedly connected to one side of the mounting column (481) where the mounting column faces the connecting plate (42), the guide plates (482) at the top ends of the two groups of the moving blocks (43) in a group of moving grooves (41) far away from the heating furnace (1) in the pushing table (2) are symmetrically distributed in a splayed manner, when the metal tube is pushed onto the pushing table (2), the end face of the metal tube is abutted with the two groups of the guide plates (482) symmetrically distributed in the splayed manner, and the guide plates (482) move to two sides under the abutting effect until the metal tube enters between the two groups of the guide plates (482).
  7. 7. The precise bending device for the metal tube through medium frequency induction heating according to claim 6, wherein the bending piece (6) comprises rotating grooves (61) formed in the top end of the bending table (3), the rotating grooves (61) are provided with two groups, the two groups of rotating grooves (61) are concentric semicircular grooves, a push rod (62) is arranged at the bottom end of the rotating groove (61), the push rod (62) is of an F shape, the push rod (62) penetrates through the rotating groove (61) and is rotationally connected with 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 with the top end of the push rod (62).
  8. 8. The precise bending device for the metal tube with the medium-frequency induction heating function according to claim 7, wherein an installation table (64) is fixedly connected to the bottom end of the bending table (3), one end of the push rod (62) extends into the installation table (64), a motor II (65) is fixedly connected to the bottom end of the installation table (64), the output end of the motor II (65) penetrates through the installation table (64) and is fixedly connected with the push rod (62), two groups of bending pieces (6) are arranged on two sides of the connecting plate (42) symmetrically, and rotating grooves (61) on the two groups of bending pieces (6) are communicated.

Description

Medium frequency induction heating type metal tube accurate bending device Technical Field The invention relates to the technical field of metal tube bending equipment, in particular to an intermediate frequency induction heating type metal tube accurate bending device. Background The medium frequency induction heating pipe bending process has the key technical means in the field of bending large-caliber thick-wall high-pressure metal pipes by means of the core advantages of local accurate heating, continuous forming, small heat affected zone and the like, the process generates an alternating magnetic field through a medium frequency power supply to locally heat the metal pipes with high efficiency, the heating area and the temperature can be accurately controlled, the problems of overhigh energy consumption, large integral deformation of the pipes and the like caused by the traditional integral heating mode are avoided, the continuous forming characteristic can be matched with the high-efficiency operation rhythm of an industrial production line, the advantage of small heat affected zone can furthest maintain the mechanical properties of the base body of the metal pipes, the bearing capacity and the structural stability of the bent pipe fittings are guaranteed, and the process is widely applied to the core engineering fields of oil-gas long-distance pipelines, main steam pipelines of power station boilers, chemical corrosion resistant pipelines and the like at present, and becomes an important technical support for guaranteeing the quality and safety of various high-pressure metal pipeline engineering. In the bending support link of the metal tube, most of support structures are easy to displace along with the pushing and bending actions of the metal tube in the bending process, the support structures cannot continuously and stably act on a bending core area, so that the support effect is discontinuously lost, meanwhile, the shape of the existing support structures is relatively fixed, the bending track change in the bending process of the metal tube is difficult to adapt, the local stress of the tube wall at the bending position is easily caused to be uneven, the quality defects of flattening, wrinkling or excessive ovality of the tube wall are further caused, and the roundness and the wall thickness uniformity of the cross section of the bent tube are influenced. Disclosure of Invention The invention aims to solve the problems that in the bending support link of a metal pipe, most support structures are easy to displace along with the pushing and bending actions of the metal pipe in the bending process, the support effect is not continuously and stably acted on a bending core area, so that the support effect is discontinuously lost, meanwhile, the shape of the existing support structure is relatively fixed, the bending track change in the bending process of the metal pipe is difficult to be self-adapted, the local stress of the pipe wall at the bending position is easily caused, the quality defects of flattening, wrinkling or excessive ellipticity of the pipe wall are further caused, and the roundness and the wall thickness uniformity of the section of the bent pipe are influenced. The medium-frequency induction heating type metal pipe accurate bending device comprises a heating furnace, wherein two sides of the heating furnace are symmetrically provided with a pushing table and a bending table, clamping pieces for clamping the metal pipe to be bent are arranged on the bending table, supporting pieces for supporting the inner wall of the metal pipe in the bending process are arranged on the clamping pieces, and bending pieces for bending the metal pipe are arranged on the bending table; The bending table is characterized in that a moving groove is formed in the top end of the bending table in a penetrating manner, a connecting plate is fixedly connected to the middle position inside the moving groove, a moving block is slidably connected in 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 in the clamping block; The supporting piece comprises a supporting block which is magnetically adsorbed and connected with the magnetic blocks in the clamping blocks, the supporting block is cylindrical, the diameter of the supporting block is matched with a metal pipe to be bent, the magnetic blocks are embedded in the supporting block, a plurality of groups of supporting blocks are arranged, and universal joints are fixedly connected between the plurality of groups of supporting blocks. As a still further scheme of the invention, the movable groove is arranged at a position close to the heating furnace, the cross section of the movable groove is in a cross shape, the movable blocks are in a T shape, the top ends of the movable blocks and the connecting plate are p