Pipe bending device for heat exchanger tube nest production

Abstract

The invention relates to the technical field of pipe bending devices, and provides a pipe bending device for heat exchanger tube nest production, which comprises a worktable, a rotating assembly is connected to the outer surface of the worktable, the rotating assembly is used for rotating to bend a pipeline, and a guide assembly is arranged on the outer surface of the worktable close to the rotating assembly. The guiding assembly is used for keeping a pipeline stable in the pipe bending process, the outer surface of the workbench is fixedly connected with a first sliding rail, the outer surface of the first sliding rail is slidably connected with a sliding frame, the outer surface of the sliding frame is fixedly connected with a gear motor, the output end of the gear motor is connected with a positioning structure, and the outer surface of the workbench is connected with a balance structure. The positioning structure comprises a columnar pipe fixedly connected to the output end of the gear motor. By means of the technical scheme, the problems that according to an existing pipe bending device, a columnar object penetrates through a pipeline for supporting or penetrates through a columnar head used for moving the pipeline, a structure for fixing and positioning the pipeline does not exist, and deflection is prone to being caused after bending are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe bending devices, and in particular to a pipe bending device for producing heat exchanger tubes. Background Art

[0002] The pipe benders are used to bend pipes using a complete set of bending equipment. The heat exchanger tubes are used to transfer part of the heat of the hot fluid to the cold fluid. They usually have multiple sets of pipes with different bending radii inside. The pipe bending device can be applied to the tubes inside the heat exchanger. After searching, the authorization announcement number CN106238528B is a pipe bending device and a CNC open-material pipe end bending machine with the device. The invention includes a bending mechanism for bending and forming pipe fittings, and the upper and lower parts of the bending mechanism are respectively provided with a processing position; a sliding mechanism is connected to the bending mechanism, and is used to drive the bending mechanism to slide in the up and down or left and right directions; a pipe clamping mechanism is used to clamp and fix the pipe fittings; a core pulling mechanism is used to drive the core rod to insert or pull out the pipe fittings. The pipe bending device adopts the above technical solution, and the bending mechanism is provided with two processing positions. During the processing of the pipe fittings, the sliding mechanism can be used to slide up and down to change different processing positions, thereby avoiding the obstruction of the machine head part, and then more three-dimensional bending processing can be performed. The present invention also discloses a CNC open-material pipe end bending machine with the device; However, the above-mentioned existing pipe bending devices are usually supported by passing a column through the pipe, or passing through a columnar head for moving the pipe. There is no structure to fix the pipe, which easily causes deviation after bending. For this reason, we propose a pipe bending device for the production of heat exchanger tubes. Summary of the Invention

[0003] The present invention proposes a pipe bending device for the production of heat exchanger tubes, which solves the problem mentioned in the background art that the existing pipe bending devices are usually supported by passing a column through the pipe, or passing through a columnar head for moving the pipe, and have no structure to fix the pipe and position it, which easily causes displacement after bending.

[0004] The technical solutions of the present invention are as follows: A pipe bending device for producing heat exchanger tubes includes a workbench, an outer surface of the workbench is connected to a rotating assembly, the rotating assembly is used to rotate and bend the pipe, the outer surface of the workbench is provided with a guide assembly near the rotating assembly, the guide assembly is used to keep the pipe stable during the pipe bending process, the outer surface of the workbench is fixedly connected to a No. 1 slide rail, the outer surface of the No. 1 slide rail is slidably connected to a sliding frame, the outer surface of the sliding frame is fixedly connected to a reduction motor, the output end of the reduction motor is connected to a positioning structure, and the outer surface of the workbench is connected to a balancing structure; The positioning structure includes a cylindrical tube fixedly connected to the output end of the reduction motor, a movable block movably connected to the surface of the cylindrical tube, a chamfered portion is provided on the inner side of the movable block, a push block is slidably connected to the inside of the cylindrical tube, a convex strip is fixedly connected to the surface of the push block, a slide groove is provided on the inner side of the cylindrical tube, an inner screw is rotatably connected to the axis of the cylindrical tube, a micro motor is fixedly connected to one end of the inner screw corresponding to the inside of the cylindrical tube, a reset component is provided between the chamfered portion and the cylindrical tube, and an anti-slip coating is fixedly connected to the surface of the movable block.

[0005] As a further technical solution of the present invention, the reset assembly includes a guide groove opened on the inner side of the cylindrical tube, the two ends of the movable block are fixedly connected with protrusions, the inner side of the cylindrical tube and the surface of the protrusion are both provided with cylindrical grooves, and a reset spring is arranged inside the cylindrical groove.

[0006] As a further technical solution of the present invention, the balancing structure includes a recessed groove opened on the surface of the workbench, and the surface of the workbench is rotatably connected to a No. 1 screw at the inner side of the recessed groove corresponding to the surface, the No. 1 screw passes through the sliding frame, and the No. 1 screw and the sliding frame are threadedly connected, and a servo motor is fixedly connected to the surface of the workbench near one end of the No. 1 screw, and the outer surface of the No. 1 screw is fixedly connected to a No. 1 gear, and the surface of the No. 1 gear is meshedly connected to the No. 2 gear, and the surface of the No. 2 gear passes through the No. 2 screw, and the inner surface of the workbench is fixedly connected to a No. 2 slide rail, and the surface of the No. 2 slide rail is slidably connected to a slider, and a balancing assembly is arranged between the slider and the No. 2 screw.

[0007] As a further technical solution of the present invention, the balancing assembly includes a sliding member movably connected to the surface of the No. 2 screw, the surface of the sliding member is hinged to the No. 1 bracket, the surface of the No. 1 bracket is hinged to the No. 2 bracket, the upper end of the No. 2 bracket is hinged to a movable frame, the surface of the movable frame is rotatably connected to a roller, the upper end of the sliding member is fixedly connected to a fixed column, and the lower end of the movable frame is fixedly connected to a sleeve column.

[0008] As a further technical solution of the present invention, the output end of the micro motor is fixedly connected to the inner screw, the inner screw and the push block are threadedly connected, the convex strip is located on the inner side of the slide groove, and the push block and the convex strip move along the length direction of the inner screw, and the movement of the push block position is achieved by the forward and reverse rotation of the inner screw.

[0009] As a further technical solution of the present invention, the inner screw forms a rotational connection with the cylindrical tube through a bearing, the surface of the pushing block is set as an inclined structure matching the chamfer of the chamfered part, and the reset assembly is used to push the movable block to move so that the surface of the movable block is flush with the surface of the cylindrical tube.

[0010] As a further technical solution of the present invention, the movable block and the protrusion are movably connected to the cylindrical tube, the anti-slip coating is made of elastic rubber material, and the outer diameter of the reset spring is smaller than the diameter of the cylindrical groove.

[0011] As a further technical solution of the present invention, the output end of the servo motor is fixedly connected to one end of the No. 1 screw, the No. 1 screw and the workbench are rotationally connected through a bearing, the No. 2 screw and the workbench are rotationally connected through a bearing, and the tooth diameter of the No. 2 gear is twice the tooth diameter of the No. 1 gear.

[0012] As a further technical solution of the present invention, the No. 1 screw is exactly the same as the No. 2 screw and the thread directions of the two are opposite. The No. 1 screw is rotated forward and backward to drive the sliding frame to move back and forth along the length direction of the No. 1 screw, and the No. 2 screw is rotated forward and backward to realize the back and forth movement of the balancing assembly along the length direction of the No. 2 screw.

[0013] As a further technical solution of the present invention, the sliding member and the No. 2 screw are threadedly connected, the slider slides along the length direction of the No. 2 slide rail, the slider and the sliding member are fixedly connected, the number of the No. 1 bracket and the No. 2 bracket is two groups and is symmetrically distributed, the fixed column and the socket column are threadedly connected, and the surface arc of the roller matches the surface of the steel pipe to be bent.

[0014] The working principle and beneficial effects of the present invention are: 1. In the present invention, through the role of the positioning structure, the pipeline can be positioned and fixed from the inside of the pipeline during use, thereby maintaining the stability of the pipeline, making the pipeline that needs to be bent more stable during the bending process and having higher bending accuracy.

[0015] 2. In the present invention, through the cooperation of the balancing structure and the positioning structure, the middle part between the pipeline and the guide assembly can always support the pipeline during the process of the positioning structure moving the pipeline, which can reduce the impact of the slight deformation of the middle part of the pipeline due to gravity on the final bending performance of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 For the present invention Figure 1 Structural diagram from another perspective; Figure 3 It is a schematic diagram of the local structure of the positioning structure of the present invention; Figure 4It is a schematic diagram of a partial structure of the positioning structure of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of the reset assembly; Figure 6 It is a schematic diagram of the local structure of the balance structure of the present invention; Figure 7 For the present invention Figure 6 Schematic diagram of the local structure; Figure 8 It is a schematic diagram of the local structure of the balancing component of the present invention.

[0018] Figure: 1. Workbench; 2. Slide rail No. 1; 3. Slide rack; 4. Reducer motor; 5. Positioning structure; 51. Columnar tube; 52. Movable block; 53. Chamfered portion; 54. Push block; 55. Protrusion; 56. Slide groove; 57. Internal screw; 58. Micro motor; 50. Anti-slip coating; 59. Reset assembly; 591. Guide groove; 592. Protrusion; 593. Columnar groove; 594. Reset spring; 6. Balance Structure; 61. Recessed groove; 62. Screw rod No. 1; 63. Servo motor; 64. Gear No. 1; 65. Screw rod No. 2; 66. Gear No. 2; 67. Slide rail No. 2; 68. Slider; 69. Balancing assembly; 691. Sliding part; 692. Bracket No. 1; 693. Bracket No. 2; 694. Movable frame; 695. Roller; 696. Fixed column; 697. Socket column; 7. Rotating assembly; 8. Guide assembly. DETAILED DESCRIPTION

[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention. Example

[0020] like Figures 1 to 5 As shown, this embodiment provides a pipe bending device for heat exchanger tube production, including a workbench 1, the outer surface of the workbench 1 is connected to a rotating component 7, the rotating component 7 is used to rotate the pipe to bend the pipe, the outer surface of the workbench 1 is provided with a guide component 8 near the rotating component 7, the guide component 8 is used to keep the pipe stable during the pipe bending process, the outer surface of the workbench 1 is fixedly connected to a No. 1 slide rail 2, the outer surface of the No. 1 slide rail 2 is slidably connected to a sliding frame 3, the outer surface of the sliding frame 3 is fixedly connected to a reduction motor 4, the output end of the reduction motor 4 is connected to a positioning structure 5, and the outer surface of the workbench 1 is connected to a balancing structure 6; The positioning structure 5 includes a cylindrical tube 51 fixedly connected to the output end of the reduction motor 4, and a movable block 52 is movably connected to the surface of the cylindrical tube 51, and a chamfered portion 53 is provided on the inner side of the movable block 52. A push block 54 is slidably connected to the inside of the cylindrical tube 51, and a convex strip 55 is fixedly connected to the surface of the push block 54. A slide groove 56 is provided on the inner side of the cylindrical tube 51, and an inner screw 57 is rotatably connected to the axis of the cylindrical tube 51. A micro motor 58 is fixedly connected to one end of the inner screw 57 inside the cylindrical tube 51, and a reset component 59 is provided between the chamfered portion 53 and the cylindrical tube 51.

[0021] The reset assembly 59 includes a guide groove 591 opened on the inner side of the cylindrical tube 51, and protrusions 592 are fixedly connected to both ends of the movable block 52. A cylindrical groove 593 is opened on the inner side of the cylindrical tube 51 and the surface of the protrusion 592. A reset spring 594 is arranged inside the cylindrical groove 593, and an anti-slip coating 50 is fixedly connected to the surface of the movable block 52.

[0022] The output end of the micro motor 58 is fixedly connected to the inner screw 57, and the inner screw 57 is threadedly connected to the pushing block 54. The ridge 55 is located on the inner side of the slide groove 56, and the pushing block 54 and the ridge 55 move along the length direction of the inner screw 57. The movement of the position of the pushing block 54 is achieved by the forward and reverse rotation of the inner screw 57; the inner screw 57 forms a rotational connection with the cylindrical tube 51 through a bearing, and the surface of the pushing block 54 is an inclined structure matching the chamfer of the chamfered portion 53. The reset assembly 59 is used to push the movable block 52 to move so that the surface of the movable block 52 is flush with the surface of the cylindrical tube 51; the movable block 52 and the ridge 592 are both movably connected to the cylindrical tube 51, the anti-slip coating 50 is made of elastic rubber material, and the outer diameter of the reset spring 594 is smaller than the diameter of the cylindrical groove 593.

[0023] In this embodiment, during use, the pipe can be positioned and fixed from the inside of the pipe, thereby maintaining the stability of the pipe, making the pipe that needs to be bent more stable during the bending process and achieving higher bending accuracy.

[0024] During use, one end of the pipe can be put on the surface of the cylindrical pipe 51 first, and then the micro motor 58 drives the inner screw 57 to rotate clockwise, driving the push block 54 together with the convex strip 55 to move away from the micro motor 58, so that the surface of the push block 54 pushes the movable block 52, forcing the movable block 52 to move away from the axis of the inner screw 57. At this time, the convex block 592 will move with it, and the return spring 594 will be compressed, and the anti-slip coating 50 together with the movable block 52 will press against the inner wall of the pipe, thus completing the connection between the cylindrical pipe 51 and the pipe. The positioning is fixed, so that the stability of the pipeline can be maintained during use. At the same time, when the pipeline needs to be removed from the cylindrical tube 51, the micro motor 58 only needs to drive the inner screw 57 to rotate counterclockwise. At this time, the pushing block 54 will not press against the inner side of the movable block 52. Under the action of the reverse force of the return spring 594, the pushing protrusion 592 moves together with the movable block 52 toward the axial direction of the inner screw 57 until the movable block 52 together with the anti-slip coating 50 do not press against the inner wall of the pipeline. At this time, the pipeline can be easily removed from the surface of the cylindrical tube 51. Example

[0025] like Figures 6 to 8 As shown, on the basis of Example 1, a balancing structure 6 is further proposed, which includes a recessed groove 61 opened on the surface of the workbench 1, and the surface of the workbench 1 is rotatably connected to the inner side of the recessed groove 61, the No. 1 screw 62 is passed through the sliding frame 3, and the No. 1 screw 62 and the sliding frame 3 are threadedly connected, and a servo motor 63 is fixedly connected to the surface of the workbench 1 near one end of the No. 1 screw 62, and the outer surface of the No. 1 screw 62 is fixedly connected to the No. 1 gear 64, the surface of the No. 1 gear 64 is meshedly connected to the No. 2 gear 66, and the surface of the No. 2 gear 66 is passed through and connected to the No. 2 screw 65, the inner surface of the workbench 1 is fixedly connected to the No. 2 slide rail 67, the surface of the No. 2 slide rail 67 is slidably connected to the slider 68, and a balancing component 69 is arranged between the slider 68 and the No. 2 screw 65.

[0026] The balancing assembly 69 includes a sliding member 691 movably connected to the surface of the No. 2 screw 65, the surface of the sliding member 691 is hinged to the No. 1 bracket 692, the surface of the No. 1 bracket 692 is hinged to the No. 2 bracket 693, the upper end of the No. 2 bracket 693 is hinged to the movable frame 694, the surface of the movable frame 694 is rotatably connected to the roller 695, the upper end of the sliding member 691 is fixedly connected to the fixed column 696, and the lower end of the movable frame 694 is fixedly connected to the sleeve column 697; the output end of the servo motor 63 is fixedly connected to one end of the No. 1 screw 62, the No. 1 screw 62 and the workbench 1 are rotatably connected through bearings, the No. 2 screw 65 and the workbench 1 are rotatably connected through bearings, and the tooth diameter of the No. 2 gear 66 is twice the tooth diameter of the No. 1 gear 64.

[0027] The No. 1 screw 62 is exactly the same as the No. 2 screw 65 and their thread directions are opposite. The No. 1 screw 62 is rotated forward and backward to drive the sliding frame 3 to move back and forth along the length direction of the No. 1 screw 62, and the No. 2 screw 65 is rotated forward and backward to realize the movement of the balancing component 69 back and forth along the length direction of the No. 2 screw 65; the sliding member 691 and the No. 2 screw 65 are threadedly connected, the slider 68 slides along the length direction of the No. 2 slide rail 67, and the slider 68 and the sliding member 691 are fixedly connected. The number of the No. 1 bracket 692 and the No. 2 bracket 693 is two groups and they are symmetrically distributed. The fixed column 696 and the socket column 697 are threadedly connected, and the surface arc of the roller 695 matches the surface of the steel pipe to be bent.

[0028] In this embodiment, the pipeline can be supported at the middle part between the pipeline and the guide assembly 8 at all times during the process of the positioning structure 5 moving the pipeline, thereby reducing the impact of slight deformation of the middle part of the pipeline due to gravity on the final bending performance of the pipeline.

[0029] When the servo motor 63 drives the No. 1 screw 62 to rotate clockwise, the slide frame 3 can be moved along the length direction of the No. 1 screw 62. During the back and forth movement of the slide frame 3, the position of the pipe on the positioning structure 5 can be driven, thereby adjusting the specific location of the pipe bending. In the process of the No. 1 gear 64 rotating along with the No. 1 screw 62, the No. 2 gear 66 will follow the rotation of the No. 1 gear 64 to drive the No. 2 screw 65 to rotate counterclockwise. Since the threads of the No. 2 screw 65 and the No. 1 screw 62 are opposite, the No. 2 screw 65 and the No. 1 screw 62 can keep the same direction in which the balancing component 69 and the slide frame 3 are conveyed respectively. And because the tooth diameter of the No. 2 gear 66 is twice that of the No. 1 gear 64, the distance that the No. 2 screw 65 conveys the balancing component 69 is half the distance that the No. 1 screw 62 conveys the sliding frame 3. Therefore, the position of the balancing component 69 supporting the pipe can always be kept in the middle of the connection between the pipe and the guide component 8 and the connection between the positioning structure 5, thereby reducing the bending of the pipe surface due to its own gravity, and making the final bent pipe more accurate, especially for pipes with large bending performance or the support of the pipe when the positioning structure 5 is away from the guide component 8, which can effectively maintain the accuracy of the pipe after bending, thereby meeting the processing requirements.

[0030] In summary, during use, one end of the pipe can be put on the surface of the cylindrical pipe 51 first, and then the micro motor 58 drives the inner screw 57 to rotate clockwise, driving the push block 54 together with the convex strip 55 to move away from the micro motor 58, so that the surface of the push block 54 pushes the movable block 52, forcing the movable block 52 to move away from the axis of the inner screw 57. At this time, the convex block 592 will move with it, and the return spring 594 will be compressed, and the anti-slip coating 50 together with the movable block 52 will press against the inner wall of the pipe, thereby completing the connection between the cylindrical pipe 51 and the pipe. The positioning between the channels is fixed, thereby being able to keep the pipeline stable during use. At the same time, when the pipeline needs to be removed from the cylindrical tube 51, it is only necessary to drive the inner screw 57 to rotate counterclockwise by the micro motor 58. At this time, the push block 54 will not press against the inner side of the movable block 52. Under the action of the reverse force of the return spring 594, the push block 592 together with the movable block 52 moves toward the axial direction of the inner screw 57 until the movable block 52 together with the anti-slip coating 50 no longer press against the inner wall of the pipeline. At this time, the pipeline can be easily removed from the surface of the cylindrical tube 51. In the process of use, when the servo motor 63 drives the No. 1 screw 62 to rotate clockwise, the sliding frame 3 can be moved along the length direction of the No. 1 screw 62. In the process of the sliding frame 3 moving back and forth, the position of the pipe on the positioning structure 5 can be driven, and the specific part of the pipe bending can be adjusted. In the process of the No. 1 gear 64 following the rotation of the No. 1 screw 62, the No. 2 gear 66 will follow the rotation of the No. 1 gear 64 to drive the No. 2 screw 65 to rotate counterclockwise. Since the threads of the No. 2 screw 65 and the No. 1 screw 62 are in opposite directions, the No. 2 screw 65 and the No. 1 screw 62 can maintain the direction in which the balancing component 69 and the sliding frame 3 are conveyed respectively. In the same direction, and because the tooth diameter of the No. 2 gear 66 is twice that of the No. 1 gear 64, the distance that the No. 2 screw 65 conveys the balancing component 69 is half of the distance that the No. 1 screw 62 conveys the sliding frame 3. Therefore, the position of the balancing component 69 supporting the pipe can always be kept in the middle of the connection between the pipe and the guide component 8 and the connection between the positioning structure 5, thereby reducing the bending of the pipe surface due to its own gravity, and thus making the final bent pipe more accurate, especially for the pipe with larger bending performance or the support of the pipe when the positioning structure 5 is away from the guide component 8, which can effectively maintain the accuracy of the pipe after bending, thereby meeting the processing requirements.

[0031] It should be noted that during use, the user can rotate the sleeve column 697 forward and backward to adjust the spacing between the movable frame 694 and the sliding member 691, and then adjust the height of the roller 695 supporting the pipe, so that the balance component 69 can adjust the support height of different pipes, especially pipes with different bending properties. For example, when some pipes are supported at two points, the bending properties of the middle part are different. The support height can be fine-tuned by the balance component 69 to meet the high-precision requirements after bending forming.

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pipe bending device for heat exchanger tube production, comprising a workbench (1), the outer surface of the workbench (1) is connected to a rotating assembly (7), the rotating assembly (7) is used to rotate the pipe to perform pipe bending operations, the outer surface of the workbench (1) is provided with a guide assembly (8) near the rotating assembly (7), the guide assembly (8) is used to keep the pipe stable during the pipe bending process, and is characterized in that: The outer surface of the workbench (1) is fixedly connected to a first slide rail (2), the outer surface of the first slide rail (2) is slidably connected to a sliding frame (3), the outer surface of the sliding frame (3) is fixedly connected to a reduction motor (4), the output end of the reduction motor (4) is connected to a positioning structure (5), and the outer surface of the workbench (1) is connected to a balancing structure (6); The positioning structure (5) comprises a columnar tube (51) fixedly connected to the output end of the reduction motor (4); a movable block (52) is movably connected to the surface of the columnar tube (51); a chamfered portion (53) is provided on the inner side of the movable block (52); a push block (54) is slidably connected to the inside of the columnar tube (51); a convex strip (55) is fixedly connected to the surface of the push block (54); a slide groove (56) is provided on the inner side of the columnar tube (51); an inner screw rod (57) is rotatably connected to the axis of the columnar tube (51); a micro motor (58) is fixedly connected to one end of the inner screw rod (57) in the interior of the columnar tube (51); and a reset component (59) is provided between the chamfered portion (53) and the columnar tube (51).

2. The tube bending device for producing heat exchanger tubes according to claim 1, characterized in that: The reset assembly (59) comprises a guide groove (591) formed on the inner side of the columnar tube (51); protrusions (592) are fixedly connected to both ends of the movable block (52); a columnar groove (593) is formed on the inner side of the columnar tube (51) and on the surface of the protrusion (592); a reset spring (594) is arranged inside the columnar groove (593); and an anti-slip coating (50) is fixedly connected to the surface of the movable block (52).

3. The tube bending device for producing heat exchanger tubes according to claim 1, characterized in that: The balancing structure (6) comprises a recessed groove (61) formed on the surface of the workbench (1); a first screw rod (62) is rotatably connected to the inner side of the recessed groove (61) on the surface of the workbench (1); the first screw rod (62) penetrates the sliding frame (3); and the first screw rod (62) and the sliding frame (3) are threadedly connected; a servo motor (63) is fixedly connected to the surface of the workbench (1) near one end of the first screw rod (62); a first gear (64) is fixedly connected to the outer surface of the first screw rod (62); a second gear (66) is meshingly connected to the surface of the first gear (64); a second screw rod (65) is penetrated and connected to the surface of the second gear (66); a second slide rail (67) is fixedly connected to the inner surface of the workbench (1); a slider (68) is slidably connected to the surface of the second slide rail (67); a balancing component (69) is provided between the slider (68) and the second screw rod (65).

4. The tube bending device for producing heat exchanger tubes according to claim 3, characterized in that: The balancing assembly (69) comprises a sliding member (691) movably sleeved on the surface of the No. 2 screw rod (65); the surface of the sliding member (691) is hingedly connected to the No. 1 bracket (692); the surface of the No. 1 bracket (692) is hingedly connected to the No. 2 bracket (693); the upper end of the No. 2 bracket (693) is hingedly connected to a movable frame (694); the surface of the movable frame (694) is rotatably connected to a roller (695); the upper end of the sliding member (691) is fixedly connected to a fixed column (696); and the lower end of the movable frame (694) is fixedly connected to a sleeve column (697).

5. The tube bending device for producing heat exchanger tubes according to claim 1, characterized in that: The output end of the micro motor (58) is fixedly connected to the inner screw (57), the inner screw (57) and the push block (54) are threadedly connected, the convex strip (55) is located on the inner side of the slide groove (56), and the push block (54) and the convex strip (55) move along the length direction of the inner screw (57), and the position of the push block (54) is moved by the forward and reverse rotation of the inner screw (57).

6. The tube bending device for producing heat exchanger tubes according to claim 5, characterized in that: The inner screw (57) is rotatably connected to the columnar tube (51) via a bearing, the surface of the push block (54) is arranged in an inclined structure matching the chamfer of the chamfered portion (53), and the reset assembly (59) is used to push the movable block (52) to move so that the surface of the movable block (52) is flush with the surface of the columnar tube (51).

7. The tube bending device for producing heat exchanger tubes according to claim 2, characterized in that: The movable block (52) and the protrusion (592) are both movably connected to the columnar tube (51); the anti-slip coating (50) is made of elastic rubber material; and the outer diameter of the return spring (594) is smaller than the diameter of the columnar groove (593).

8. The tube bending device for producing heat exchanger tubes according to claim 3, characterized in that: The output end of the servo motor (63) is fixedly connected to one end of the first screw rod (62); the first screw rod (62) is rotatably connected to the workbench (1) via a bearing; the second screw rod (65) is rotatably connected to the workbench (1) via a bearing; and the tooth diameter of the second gear (66) is twice the tooth diameter of the first gear (64).

9. The tube bending device for producing heat exchanger tubes according to claim 8, characterized in that: The first screw rod (62) is completely identical to the second screw rod (65) and has opposite thread directions. The first screw rod (62) is rotated forward and reversely to drive the sliding frame (3) to move back and forth along the length direction of the first screw rod (62). The second screw rod (65) is rotated forward and reversely to drive the balancing component (69) to move back and forth along the length direction of the second screw rod (65).

10. The tube bending device for producing heat exchanger tubes according to claim 4, characterized in that: The sliding member (691) is threadedly connected to the second screw rod (65), the slider (68) slides along the length direction of the second slide rail (67), the slider (68) is fixedly connected to the sliding member (691), the number of the first bracket (692) and the second bracket (693) is two groups and they are symmetrically distributed, the fixed column (696) and the sleeve column (697) are threadedly connected, and the surface arc of the roller (695) matches the surface of the steel pipe to be bent.

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