A long u-bending machine for bending the core of an ultra-thin radiator tube

Abstract

The application provides a heat sink ultra-thin pipe bending core head long U-bending pipe machine, which comprises a rack, a pushing assembly for positioning a copper pipe is slidably installed on the upper side of the rack, a plurality of short rods for installing anti-deformation assemblies are installed at the front end of the pushing assembly, an anti-deformation assembly for extending into the copper pipe and preventing the copper pipe from deforming when being bent is installed inside and at the front side of each short rod, compared with the prior art, the application has the following beneficial effects: through the cooperation of the spherical blocks one to six structure in series connection of the steel ball one, the steel ball two and the steel ball three, the traditional single ball support is replaced, a plurality of continuous surface contact supports are formed with the inner wall of the copper pipe, the bending plastic deformation full area of the bending radius is effectively covered, the metal non-uniform flow in the deformation area in the bending dynamic process is synchronously constrained, the inner side collapse amount of the ultra-thin copper pipe after being bent is controlled to be less than 0.05mm, the outer side wall thickness reduction rate is controlled to be less than 8%, and the micro-crack defect is solved.

Description

Technical Field

[0001] This invention belongs to the technical field of pipe bending machine equipment, and specifically relates to a long U-bending machine for bending ultra-thin radiator tubes. Background Technology

[0002] In the bending and forming process of ultra-thin copper tubes for radiators, in order to suppress forming defects such as flattening and collapse in the bending area and thinning of the outer wall thickness, the industry generally adopts a mandrel structure with a built-in short rod and a steel wire to pull the moving ball. During bending, the short rod is pushed into the bending area through the long stroke structure at the rear end, and the ball provides inner wall support to prevent deformation. However, the existing single ball support structure still has the prominent problem of poor anti-deformation effect. Its core drawback is that the single ball can only form a ring line contact with the inner wall of the copper tube, and cannot form a continuous and uniform rigid support for the entire arc length and the entire cross section of the bending plastic deformation zone. The cause of this defect is that when the ultra-thin copper tube is bent, the inner side of the bending neutral layer is prone to wrinkling and collapse due to compressive stress, and the outer side is prone to thinning of the wall thickness beyond the tolerance or even micro-cracks due to tensile stress. The effective support range of the single ball is limited to the very small axial area corresponding to the diameter of the ball, and cannot simultaneously constrain the non-uniform flow of metal in the deformation zone during the bending dynamic process. Under the condition of small bending radius, the deformation zone exceeds the coverage area of ​​the ball. At the same time, the fit gap between the ball and the inner wall of the copper tube will cause the support to lag, further aggravating the loss of control of deformation. To address the aforementioned issues, conventional solutions include increasing the diameter of the beads to reduce the fit clearance, increasing the number of beads to form multi-segment support, and using a low-melting-point alloy to fill the inner cavity. However, increasing the bead diameter significantly increases the resistance during tube insertion and core pulling, easily scratching the inner wall of the copper tube and even causing the beads to get stuck and unable to be removed. Increasing the number of beads increases the complexity of the mandrel structure, significantly increasing the difficulty of tube insertion, and is not suitable for the efficient production of densely arranged multi-connected copper tubes in heat sinks. The low-melting-point alloy filling process requires multiple steps such as melting and cleaning, resulting in a long production cycle, high cost, and the risk of alloy residue contamination, making it difficult to meet the requirements of large-scale continuous production. Therefore, we hope to design a bending mandrel with a novel structure and a long U-bending machine to solve this problem. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a long U-bending machine for bending ultra-thin radiator tubes, thereby solving the problems mentioned in the background art.

[0004] This invention is achieved through the following technical solution: a bending machine for bending copper tubes of ultra-thin radiator tubes, comprising: a frame, a bending table, a drive assembly, a bending assembly, a guide assembly, and a docking table. A bending table for bending copper tubes is installed on the upper front side of the frame. A drive assembly for providing the power required for bending is installed on the left, right, and inside front of the frame. A bending assembly for fixing copper tubes and bending copper tubes in conjunction with the bending table is installed on the front of the frame through the drive assembly. A guide assembly for guiding the copper tubes is installed on the upper front end of the frame through a screw knob. A docking platform for positioning and guiding copper tubes is installed on the upper front side of the frame via a screw knob. A pushing component for positioning copper tubes is slidably installed on the upper side of the frame. Multiple short rods for installing anti-deformation components are installed at the front end of the pushing component. Each short rod has an anti-deformation component installed inside and on the front side to extend into the copper tube and prevent deformation during bending. In actual use, an external automatic copper tube feeding device is also provided at the front end of the bending component for automatic feeding of the entire copper tube bending device. The drive component also includes two sets of synchronous servo bending motors and reducers. The two sets of bending motors are respectively mounted on the mounting plates on the left and right sides, and their output shafts are connected to the rotating disks for driving the rotating disks on both sides to rotate synchronously 180°.

[0005] In a preferred embodiment, the frame includes a base, and a mounting platform for mounting a push cylinder is bolted to the upper rear end of the base. A servo motor for driving a lead screw is also mounted on the upper rear end of the base. The servo motor is placed on the underside of the mounting platform, and a lead screw for driving the push assembly is rotatably mounted inside the upper side of the base via a bearing; The rear end of the lead screw is connected to the output shaft of the servo motor via a coupling shaft, and slide rails for sliding installation of the push assembly are respectively installed on the left and right sides of the upper end of the machine base.

[0006] In a preferred embodiment, a vertical plate for mounting the drive assembly is provided on the left and right sides of the front end of the base, and a mounting plate for mounting the bearing seat is installed on the outer side of each of the two vertical plates. Each of the two mounting plates has a bearing housing with a bearing installed on its outer side. The outer sides of the two mounting plates are bolted with a protective outer shell. The inner sides of the two vertical plates are rotatably mounted with a rotating disk for directly driving the bending assembly to bend via a rotating shaft and a bearing housing with a bearing.

[0007] In a preferred embodiment, the bending table includes a worktable, which is mounted on the upper side of the front end of the machine base, and a plurality of equally spaced pads are mounted on the upper front side of the worktable from left to right. The front ends of the plurality of pad blocks extend forward from the upper front end of the workbench, and a guide groove for supporting and guiding the copper tube is formed through the middle of the upper end of each pad block from front to back. The cross-section of the guide groove is a concave semi-circular structure.

[0008] In a preferred embodiment, the bending assembly includes a tilting table, the left rear side and the right rear side of the tilting table being fixedly connected to the rotating disk on the left side and the rotating disk on the right side of the machine base by bolts, respectively. Multiple pads for fixing and guiding copper pipes are installed on the front side of the upper part of the flipping platform. A cantilever frame for providing a support base is installed on the front side of the flipping platform by bolts. A fixing frame for fixing the guide pipe is installed on the cantilever frame and the upper front side of the flipping platform. The fixed frame is equipped with multiple equally spaced guide tubes, and each of the second pads has a bending mold for U-shaped bending of the copper tube on its upper rear end. Each of the two pads has a recessed semi-circular cross-section formed by penetrating the middle of the front side of the upper end. The cross-sectional radius of the recessed groove is the same as that of the guide groove. Each of the two pads has a through hole formed from front to back at the lower end for guiding the copper tube. The axis of the through hole is collinear with the axis of the guide tube, and the inner diameter of the through hole is the same as the inner diameter of the guide tube. The number and distribution of the through holes are matched with the number and distribution of the guide tubes. Each of the second pads has a rectangular groove formed by an upward indentation at its lower end. The lower end of the flipping table has an installation cavity inside. Multiple equidistant fixed cylinders are installed on the top of the installation cavity. The number and distribution of the fixed cylinders are matched with the number and distribution of the second pads. The piston rod of each of the fixed cylinders extends upward through the flipping table and into the rectangular groove of the corresponding upper side pad block 2, and the upper side of the piston rod is slidably connected to the upper part of the flipping table. A flexible extrusion block for temporarily fixing the copper tube is installed at the top of the piston rod. The upper end of the flexible extrusion block is recessed downward to form a concave arc groove, the diameter of which is the same as the diameter of the through hole, and the flexible extrusion block extends upward to the bottom of the through hole via a piston rod; The bending mold has an inwardly recessed outer wall forming a bending groove. The vertical and longitudinal sections of the bending groove are both U-shaped. The bottom of the upper end of the bending groove is flush with the bottom of the relief groove, the top of the lower end of the bending groove is flush with the top of the through hole, and the bottom of the through hole is flush with the bottom of the guide groove.

[0009] In a preferred embodiment, the guide assembly includes a plurality of sliding frames, which are fixedly connected to a slide rail at the upper end of the base via a screw knob and a slider. Each of the sliding frames has multiple equally spaced conduits fixed from front to back, and the distribution position and number of conduits on each sliding frame are the same as the distribution position and number of the delivery tubes; The docking platform is located directly behind the guide assembly. The docking platform includes a slide block. The slide block is fixedly connected to the slide rail at the upper end of the machine base through a screw knob and a slider. A positioning platform for guiding the copper tube is fixed to the middle of the upper side of the slide block by bolts. A strip-structured fixing plate is fixed to the upper front side of the positioning platform. Multiple equidistant connecting pipes are provided between the fixing plate and the positioning platform. The front ends of the multiple connecting pipes extend forward and penetrate through the fixing plate. Multiple positioning holes are formed by penetrating backward through the front surface of the positioning platform. The number and distribution of the plurality of positioning holes are matched with the number and distribution of the connecting pipes. The axis of the positioning hole is collinear with the axis of the connecting pipe, and the rear end of the connecting pipe abuts against the front surface of the positioning table. The pushing component is located on the rear side of the docking platform. The pushing component includes a slide 1 and a slide 2. The rear side of the slide 2 is connected to a slide 1 via a limiting chain. The front side of the slide 1 is connected to two equally spaced slide 1s via a limiting chain. One slide carriage two and three slide carriages one are slidably connected to the slide rail on the upper side of the machine base by a slider. A connecting plate is welded to the lower end of the slide carriage two. A screw nut is installed at the lower end of the connecting plate and is connected to the screw rod through the screw nut. Multiple through pipes are installed from front to back in one slide carriage two and three slide carriages one. The axes of the multiple through pipes are collinear with the axes of the multiple connecting pipes and the positioning holes. The multiple through pipes are slidably connected to the three slides in the front-back direction. The multiple through pipes are fixedly connected to the slides. The length of the through pipes is greater than the length of one slide and the three slides when they are extended to their maximum stroke. The pushing component also includes a top plate, the rear end of which is fixedly connected to the front end of the piston rod of the pushing cylinder. The top plate is slidably connected to the slide rail on the upper side of the base via a slider four. Multiple push rods are fixed to the front side of the top plate. Multiple top rods are slidably connected to multiple through pipes, and the length of the top rod is greater than the length of the through pipe. The axis of the top rod is collinear with the axis of the through hole. A bumper post is welded to the left and right sides of the front surface of one slide and three slides.

[0010] In a preferred embodiment, the short rod includes a rod cylinder, and a return spring and a limiting circular plate are installed inside the rear end of the rod cylinder. The rear side of the return spring is welded and fixed to the limiting circular plate. The limiting circular plate is placed at the rear end of the reset spring. A screw is welded to the middle of the front side of the limiting circular plate. The front side of the screw is fixedly threaded to the connecting block. The connecting block includes a long nut. The rear side of the long nut has an internal threaded hole for connecting with the screw. The front end of the long nut is integrally formed with a connecting rod. The connecting rod has a fixed hole formed from top to bottom at its front end. A limit plate is welded inside the front end of the rod tube. A through hole is formed from front to back in the middle of the limit plate. A fixed plane is provided on the upper and lower sides of the rear end of the rod tube in an axially symmetrical structure. Both of the fixed planes are recessed inward to form a blind hole. The rod is fixed inside the front end of the top rod by screws, and the front end of the rod extends out of the front end of the top rod.

[0011] In a preferred embodiment, the anti-deformation component includes a steel wire rope, the rear end of which is fastened to a connecting block via a locking buckle and a fixing hole, and the locking buckle has a threaded blind hole opened inward on its upper and lower sides respectively. The locking buckle includes a rib and a locking screw. The upper and lower sides of the front surface of the rib respectively extend backward to form a locking hole. Each locking hole is threaded with a locking screw for locking the wire rope. The upper locking hole is perpendicularly connected to the upper threaded blind hole, and the lower locking hole is perpendicularly connected to the lower threaded blind hole. The front end of the steel wire rope is slidably connected with steel ball one, steel ball two and steel ball three. A spherical block two is slidably connected to the front side of steel ball one via the steel wire rope, and a spherical block one is slidably connected to the rear side of steel ball one via the steel wire rope. A spherical block four is slidably installed on the front side of the second steel ball via a steel wire rope; a spherical block three is slidably installed on the rear side of the second steel ball via a steel wire rope; a spherical block six is ​​slidably installed on the front side of the third steel ball via a steel wire rope; and a spherical block five is slidably installed on the rear side of the third steel ball via a steel wire rope. Multiple washers (I) for positioning steel balls (II) are slidably installed between spherical blocks two and three via a series of steel wire ropes. Similarly, multiple washers (II) for positioning steel balls (III) are slidably installed between spherical blocks four and five via a series of steel wire ropes. In actual use, the outer diameters of steel balls one, two, and three are all clearance-fitted with the inner diameter of the copper tube to be processed, with a single-sided clearance of 0.03mm. The spherical ends of the spherical blocks are in contact with the spherical surfaces of the corresponding steel balls, ensuring that the steel balls can adaptively deflect with the bending of the copper tube during the bending process, forming continuous support.

[0012] After adopting the above technical solution, the beneficial effects of the present invention are as follows: 1. By using the structure of spherical blocks one to six connected in series with steel ball one, steel ball two and steel ball three, the traditional single ball support is replaced, forming a multi-segment continuous surface contact support with the inner wall of the copper tube, effectively covering the entire area of ​​bending plastic deformation of the bending radius, and simultaneously constraining the non-uniform flow of metal in the deformation zone during the bending dynamic process, controlling the inner collapse of the ultra-thin copper tube after bending to within 0.05mm, and controlling the outer wall thickness reduction rate to within 8%, thus solving the micro-crack defect; The setup of the frame, bending table, drive assembly, bending assembly, guide assembly, docking table, and pushing assembly is perfectly adapted to the synchronous processing of multiple densely arranged ultra-thin copper tubes. Through the coaxial guiding design of the guide assembly, docking table, and pushing assembly, it ensures that multiple copper tubes are coaxially aligned throughout the feeding, core insertion, and bending process. The resistance during tube insertion and core pulling is small, and there are no problems such as scratches on the inner wall or steel ball jamming, which meets the requirements of large-scale continuous production. The overall structure features a modular design, allowing for quick disassembly and replacement of bending components, bending tables, and pushing components. It is compatible with the processing of copper tubes for radiators of different specifications and numbers of connections, eliminating the need for additional melting and cleaning processes, and eliminating the risk of alloy residue contamination, thus significantly reducing production costs. By using the built-in return spring and steel wire rope structure in the short bar, adaptive deflection and displacement margins can be provided for steel ball one, steel ball two, and steel ball three during bending, avoiding support lag or steel wire rope breakage, improving the stability and service life of the equipment, and reducing maintenance costs.

[0013] 2. By optimizing the axial spacing and fitting accuracy of steel ball one, steel ball two, and steel ball three, full-coverage continuous rigid support for the bending plastic deformation zone is achieved, meeting the requirements of different bending radii; By adapting the clamping force of the flexible extrusion block, combined with the segmented bending speed control and stable feeding design, the movement of the ultra-thin-walled tube during the bending process is avoided, and the problems of crushing and scratching the copper tube are eliminated. The short bar's built-in return spring and wire rope structure can adapt to the large-angle deflection requirements of steel balls one, two, and three during extremely small radius bending, providing precise displacement compensation, avoiding support lag and structural damage, ensuring strong equipment operation stability, low maintenance costs, and meeting the requirements of large-volume, high-consistency production. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of a U-bending machine for bending the core of an ultra-thin radiator tube according to the present invention.

[0016] Figure 2 This is a schematic diagram of the bending assembly and bending table structure of a bending core length U-bending machine for ultra-thin radiator tubes according to the present invention.

[0017] Figure 3 This is a schematic diagram of the push assembly and frame connection structure of a bending core length U-bending machine for ultra-thin radiator tubes according to the present invention.

[0018] Figure 4 This is a schematic diagram of the bending assembly structure of a U-shaped tube bending machine for bending ultra-thin radiator tubes according to the present invention.

[0019] Figure 5 for Figure 4 A schematic diagram of the enlarged structure at point A in the middle.

[0020] Figure 6 This is a schematic diagram of the bending die structure of a U-shaped tube bending machine for bending ultra-thin radiator tubes according to the present invention.

[0021] Figure 7 This is a schematic diagram of the guide assembly, docking platform, and pushing assembly structure of a bending core long U-bending machine for ultra-thin radiator tubes according to the present invention.

[0022] Figure 8 This is a schematic diagram of the short rod structure of a long U-bending machine for bending the core of an ultra-thin radiator tube according to the present invention.

[0023] Figure 9 for Figure 8 A schematic diagram of the enlarged structure at point B.

[0024] Figure 10 This is a schematic diagram of the rod and cylinder structure of a long U-bending machine for bending ultra-thin radiator tubes according to the present invention.

[0025] Figure 11 This is a schematic diagram of the connecting block structure of a long U-bending machine for bending the core of an ultra-thin radiator tube according to the present invention.

[0026] Figure 12 This is a schematic diagram of the connecting block, limiting circular plate, return spring, and rod-tube steel structure of a long U-bending machine for bending the core of an ultra-thin radiator tube according to the present invention.

[0027] Figure 13 This is a schematic diagram of the anti-deformation component structure of a long U-bending machine for bending ultra-thin radiator tubes according to the present invention.

[0028] Figure 14 for Figure 13A schematic diagram of the enlarged structure at point C.

[0029] Figure 15 This is a schematic diagram of the connection structure between the steel wire rope and steel ball one, steel ball two, and steel ball three of the bending mandrel for a long U-shaped tube of a radiator according to the present invention.

[0030] Figure 16 This is a schematic diagram of the locking buckle structure of a long U-bending machine for bending the core of an ultra-thin radiator tube according to the present invention.

[0031] In the diagram, 100 is the frame, 110 is the push cylinder, 120 is the mounting platform, 130 is the lead screw, 140 is the base, and 150 is the slide rail. 200-Bending table, 210-Workbench, 220-Padded block one, 221-Guide groove; 300 - Drive assembly, 310 - Mounting plate, 320 - Rotary disc; 400-Bending assembly, 410-Padded block 2, 411-Relief groove, 412-Through hole, 420-Tilting table, 421-Fixed cylinder, 422-Flexible extrusion block, 430-Fixed frame, 440-Guide pipe, 450-Cantilever frame, 460-Bending die, 461-Bending groove; 500 - Guide assembly, 510 - Sliding frame, 520 - Conduit; 600-Dating table, 610-Positioning table, 620-Slide, 630-Fixing plate, 640-Connecting pipe; 700-Pushing component, 710-Limiting chain, 720-Top plate, 730-Top rod, 740-Slide carriage one, 750-Slide carriage two, 751-Connecting plate, 760-Through pipe; 800-Short rod, 810-Connecting block, 811-Long nut, 812-Connecting rod, 813-Fixing hole, 814-Internal threaded hole, 820-Rod cylinder, 821-Limiting plate, 822-Through hole, 823-Fixing plane, 830-Return spring, 840-Limiting round plate, 850-Screw; 900-Anti-deformation component, 910-Steel wire rope, 920-Steel ball one, 921-Spherical block one, 922-Spherical block two, 930-Steel ball two, 931-Spherical block three, 932-Spherical block four, 940-Steel ball three, 941-Spherical block five, 942-Spherical block six, 950-Locking buckle, 951-Ribbon rod, 952-Threaded blind hole, 953-Locking screw, 954-Locking hole. Detailed Implementation

[0032] 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.

[0033] As the first embodiment of the present invention: Please see Figures 1 to 16 This invention provides a technical solution: a bending core for ultra-thin radiator tubes and a long U-shaped tube bending machine, comprising: a frame 100, a bending table 200, a drive assembly 300, a bending assembly 400, a guide assembly 500, and a docking table 600. The bending table 200 for bending copper tubes is installed on the upper front side of the frame 100. The drive assembly 300 for providing the power required for bending is installed on the left, right, and inside front of the frame 100. The bending assembly 400 for fixing copper tubes and bending copper tubes in conjunction with the bending table 200 is installed at the front of the frame 100 via the drive assembly 300. The guide assembly 500 for guiding the copper tubes is installed at the upper front end of the frame 100 via a screw knob. A docking platform 600 for positioning and guiding copper tubes is installed on the upper front side of the frame 100 via a screw knob. A pushing component 700 for positioning copper tubes is slidably installed on the upper side of the frame 100. Multiple short rods 800 for installing anti-deformation components 900 are installed at the front end of the pushing component 700. Each short rod 800 has an anti-deformation component 900 installed inside and on the front side to extend into the copper tube and prevent deformation when the copper tube is bent. In actual use, the front end of the bending component 400 is also equipped with an external automatic copper tube feeding device for automatic feeding of the entire copper tube bending device.

[0034] The frame 100 includes a base 140, a mounting platform 120 for mounting a push cylinder 110 is bolted to the upper rear end of the base 140, and a servo motor for driving a lead screw 130 is mounted on the upper rear end of the base 140. The servo motor is placed under the mounting platform 120, and the lead screw 130 for driving the push assembly 700 is rotatably mounted inside the upper side of the base 140 via bearings. The rear end of the lead screw 130 is connected to the output shaft of the servo motor via a coupling shaft. The upper left and right sides of the base 140 are respectively equipped with slide rails 150 for sliding installation of the push assembly 700.

[0035] The front left and right sides of the base 140 are respectively provided with a vertical plate for mounting the drive assembly 300, and the outer sides of the two vertical plates are respectively provided with a mounting plate 310 for mounting the bearing seat. Each of the two mounting plates 310 has a bearing housing with a bearing installed on its outer side. The outer sides of the two mounting plates 310 are bolted with a protective outer shell. The inner sides of the two vertical plates are rotatably mounted with a rotating disk 320 for directly driving the bending assembly 400 to bend via a rotating shaft and a bearing housing with a bearing.

[0036] The bending table 200 includes a worktable 210, which is installed on the upper front side of the machine base 140. Multiple equidistant pads 220 are installed on the upper front side of the worktable 210 from left to right. The front ends of multiple pads 220 extend forward from the upper front end of the worktable 210, and each pad 220 forms a guide groove 221 through the middle of its upper end from front to back to support and guide the copper tube. The cross-section of the guide groove 221 is a concave semi-circular structure.

[0037] The bending assembly 400 includes a tilting table 420, the left rear side and the right rear side of the tilting table 420 being fixedly connected to the rotating disk 320 on the left side and the rotating disk 320 on the right side of the base 140 by bolts, respectively. Multiple pads 410 for fixing and guiding copper pipes are installed on the front side of the upper end of the tilting table 420. A cantilever 450 for providing a support base is bolted to the front side of the tilting table 420. A fixing frame 430 for fixing the guide pipe 440 is installed on the upper front side of the cantilever 450 and the tilting table 420. The fixed frame 430 is equipped with multiple equally spaced guide tubes 440, and each pad 410 has a bending mold 460 for U-shaped bending of the copper tube on the upper rear end. Each pad 410 has a recessed semi-circular cross-section groove 411 formed by penetrating the middle of the front side of the upper end of each pad 410. The cross-sectional radius of the recessed groove 411 is the same as that of the guide groove 221. Each pad 410 has a through hole 412 formed by penetrating from front to back at the lower end of each pad 410 for guiding the copper tube. The axis of the through hole 412 is collinear with the axis of the guide tube 440, and the inner diameter of the through hole 412 is the same as the inner diameter of the guide tube 440. The number and distribution of the through holes 412 are matched with the number and distribution of the guide tubes 440. Each pad 410 has a rectangular groove formed by an upward indentation at its lower end. The lower end of the flipping table 420 has an installation cavity. Multiple equidistant fixed cylinders 421 are installed on the top of the installation cavity. The number and distribution of the fixed cylinders 421 match the number and distribution of the pad 410. The piston rod of each fixed cylinder 421 extends upward through the tilting table 420 and into the rectangular groove of the corresponding upper pad 410. The upper side of the piston rod is slidably connected to the upper part of the tilting table 420. A flexible extrusion block 422 for temporarily fixing the copper tube is installed at the top of the piston rod. The upper end of the flexible extrusion block 422 is recessed downward to form a concave arc groove. The diameter of the concave arc groove is the same as the diameter of the through hole 412. The flexible extrusion block 422 extends upward to the bottom of the through hole 412 through the piston rod. The bending die 460 has an inwardly recessed outer wall in the middle to form a bending groove 461. The vertical and longitudinal sections of the bending groove 461 are both U-shaped. The bottom of the upper end of the bending groove 461 is flush with the bottom of the relief groove 411, the top of the lower end of the bending groove 461 is flush with the top of the through hole 412, and the bottom of the through hole 412 is flush with the bottom of the guide groove 221.

[0038] The guide assembly 500 includes multiple sliding frames 510, which are fixedly connected to the slide rail 150 at the upper end of the base 140 via screws, knobs, and sliders. Each sliding frame 510 has multiple equally spaced conduits 520 fixed from front to back. The distribution position and number of conduits 520 on each sliding frame 510 are the same as the distribution position and number of delivery tubes 440. The docking platform 600 is located directly behind the guide assembly 500. The docking platform 600 includes a slide 620. The slide 620 is fixedly connected to the slide rail 150 at the upper end of the base 140 via a screw, knob and slider 2. A positioning platform 610 for guiding the copper tube is fixed to the middle of the upper side of the slide 620 by bolts. A strip-shaped fixing plate 630 is fixed to the upper front side of the positioning platform 610. Multiple equidistant connecting pipes 640 are provided between the fixing plate 630 and the positioning platform 610. The front ends of the multiple connecting pipes 640 extend forward and penetrate through the fixing plate 630. Multiple positioning holes are formed by penetrating the front surface of the positioning platform 610 backward. The number and distribution of multiple positioning holes are matched with the number and distribution of connecting pipes 640. The axis of the positioning holes is collinear with the axis of the connecting pipes 640, and the rear end of the connecting pipes 640 abuts against the front surface of the positioning table 610. The push assembly 700 is located on the rear side of the docking platform 600. The push assembly 700 includes a first slide 740 and a second slide 750. The rear side of the second slide 750 is connected to a first slide 740 via a limiting chain 710. The front side of the first slide 740 is connected to two equally spaced slides 740 via a limiting chain 710. One slide 750 and three slides 740 are slidably connected to the slide rail 150 on the upper side of the machine base 140 via a slider. A connecting plate 751 is welded to the lower end of the slide 750. A nut is installed at the lower end of the connecting plate 751 and is connected to the lead screw 130 through the nut. Multiple through pipes 760 are installed from front to back in one slide 750 and three slides 740. The axes of the multiple through pipes 760 are collinear with the axes of the multiple connecting pipes 640 and the positioning holes. The multiple through pipes 760 are slidably connected to the three slides 740 in the front-back direction. The multiple through pipes 760 are fixedly connected to the slide 750. The length of the through pipes 760 is greater than the length of one slide 750 and the three slides 740 when extended to their maximum stroke. The push assembly 700 also includes a top plate 720. The rear end of the top plate 720 is fixedly connected to the front end of the piston rod of the push cylinder 110. The top plate 720 is slidably connected to the slide rail 150 on the upper side of the base 140 via a slider four. Multiple push rods 730 are fixed to the front side of the top plate 720. Multiple push rods 730 are slidably connected to multiple through pipes 760 respectively, and the length of the push rod 730 is greater than the length of the through pipe 760. The axis of the push rod 730 is collinear with the axis of the through hole 412. A bumper post is welded to the left and right sides of the front surface of one slide 2 750 and three slides 1 740 respectively.

[0039] The short rod 800 includes a rod cylinder 820. A return spring 830 and a limiting circular plate 840 are installed inside the rear end of the rod cylinder 820. The rear side of the return spring 830 is welded and fixed to the limiting circular plate 840. A limiting circular plate 840 is placed at the rear end of the return spring 830. A screw 850 is welded to the middle of the front side of the limiting circular plate 840. The front side of the screw 850 is fixedly threaded to the connecting block 810. The connecting block 810 includes a long nut 811. The rear side of the long nut 811 has an internal threaded hole 814 for connecting with the screw 850. The front end of the long nut 811 is integrally formed with a connecting rod 812. The connecting rod 812 has a fixing hole 813 formed by passing through from top to bottom at the front end. A limiting plate 821 is welded inside the front end of the rod cylinder 820. A through hole 822 is formed by passing through from front to back in the middle of the limiting plate 821. A fixing plane 823 is provided on the upper and lower sides of the rear end of the rod cylinder 820 in an axisymmetric structure. Both fixed planes 823 are recessed inward to form a blind hole. The rod tube 820 is fixed inside the front end of the push rod 730 by screws, and the front end of the rod tube 820 extends out of the front end of the push rod 730.

[0040] Specifically, 1. Based on the length and bending position of the copper tube to be processed, adjust and lock the front and rear positions of the sliding frame 510 of the guide assembly 500 and the sliding block 620 of the docking table 600 on the slide rail 150 by using the screw knob; based on the bending angle of the copper tube, preset the rotation angle of the rotating disk 320 driven by the drive assembly 300 to 180°, and preset the action sequence of the servo motor, the push cylinder 110, and the fixing cylinder 421; insert multiple ultra-thin copper tubes to be processed sequentially into the guide tube 440 of the bending assembly 400, the second pad 410, the first pad 220 of the bending table 200, the guide tube 520 of the guide assembly 500, and the positioning table 610 of the docking table 600, with the rear end of the copper tube extending to the positioning hole of the positioning table 610, completing the material waiting; after the copper tube has been fed to a fixed length, the piston rod of the fixing cylinder 421 extends upward to drive the flexible extrusion block 422. Moving upwards, the copper tube inside the through hole 412 is pressed and fixed through the concave arc groove to prevent the copper tube from moving during bending. Specifically, multiple fixing cylinders 421 (all fixing cylinders 421 are synchronous cylinders) on the lower side of the flipping table 420 are activated simultaneously. Under the lifting action of the fixing cylinders 421, the flexible extrusion blocks 422 at the bottom of the multiple pad blocks 410 press against the copper tube part located in the through hole 412 and are pressed and fixed. The extrusion pressure of the flexible extrusion block 422 can be controlled so that the copper tube is fixed by deformation but not excessively extruded and deformed. The extrusion pressure is set according to the actual use requirements. The servo motor then starts, driving the lead screw 130 to rotate. Through the lead screw nut and connecting plate 751, the second slide 750 moves forward along the slide rail 150. The second slide 750, via the limiting chain 710, drives the last slide 740 to slide forward, causing the through pipes 760 fixedly connected to the second slide 750 to move forward. The front portions of the multiple through pipes 760 pass through the two front slides 750 and slide forward (the friction of the sliding through pipes 760 is less than the friction of the sliding between the second slide 750 and the slide rail 150, so the second slide 750 does not follow the sliding). The front ends of the multiple through pipes 760 extend into the rear interior of the positioning hole of the positioning table 610. The servo motor stops running, and then the push cylinder 110 on the mounting platform 120 of the machine base 140 is started, driving the top plate 720 forward. Under the action of the top plate 720, the push rod 730 pushes the front short rod 800. The anti-deformation component 900 moves forward synchronously. The steel wire rope 910, steel ball 1 920, steel ball 2 930, steel ball 3 940, and matching spherical block and washer of the anti-deformation component 900 pass through the through hole 412 and extend into the inner cavity of the copper tube to be bent (that is, the part of the copper tube located below the bending groove 461 and inside the through hole 412) until all three steel balls 1 920, steel ball 2 930, and steel ball 3 940 enter the inner cavity position corresponding to the bending plastic deformation zone of the copper tube. The cylinder 110 is pushed to maintain the extended state, completing the support and positioning of the short rod 800 and the anti-deformation component 900. When the drive component 300 is started, it drives the rotating disks 320 on the left and right sides to rotate 180° synchronously. The rotating disks 320 drive the flipping table 420 to rotate synchronously. The flipping table 420 drives the pressed copper tube to rotate synchronously through the second pad 410 and the bending die 460. With the cooperation of the bending die 460, the second pad 410, the first pad 220 and the anti-deformation component 900, the copper tube completes the long U-shaped bending and forming. After flipping 180°, the second pad 410 is exactly superimposed on the upper side of the first pad 220. During the bending process, steel balls 920, 930, and 940 located inside the copper tube's inner cavity, through adaptive deflection of the front and rear spherical blocks, form continuous rigid support across the entire arc length and cross-section of the neutral layer during bending. This constrains the non-uniform metal flow in the copper tube's bending deformation zone, suppressing wrinkling and collapse on the inner side and thinning of the outer wall thickness. During this process, steel ball 920 is positioned directly below the bending groove 461, while steel balls 930 and 940 are positioned within the through hole 412. When the copper tube is bent, steel ball 920 is positioned below the U-shaped bend in the copper tube, ensuring non-uniform metal flow in this bending deformation zone and suppressing wrinkling and collapse on the inner side and thinning of the outer wall thickness. Steel ball 930 is positioned in the middle of the U-shaped bend, ensuring non-uniform metal flow in this bending deformation zone and suppressing wrinkling and collapse on the inner side and thinning of the outer wall thickness. Steel ball 940... Located on the upper part of the U-shaped bend of the copper tube, it is mirrored with steel ball 920. This ensures non-uniform metal flow in the upper bending deformation zone of the copper tube, suppresses wrinkling and collapse on the inner side and thinning of the outer wall thickness. During the bending process, steel ball 920, steel ball 930, steel ball 940 and the connected steel wire rope 910 bend along with the steel ball, thereby generating tension on the limiting circular plate 840. The relative position of the limiting circular plate 840 and the rod cylinder 820 changes, and the return spring 830 is compressed, providing adaptive tension allowance for the steel wire rope 910 and preventing the steel wire rope 910 from being pulled and broken. After bending and forming, the cylinder 110 is depressurized and reset, causing the top plate 720 and top rod 730 to retract backward. The reset spring 830 rebounds, causing the connecting block 810 and wire rope 910 to retract backward, thereby pulling steel balls 920, 930, and 940, along with their matching spherical blocks and washers, out of the inner cavity of the copper tube and resetting them to the front side of the rod cylinder 820 of the short rod 800 (steel balls 920, 930, and 940 do not enter the rod cylinder 820; the rear side of steel ball 920 elastically abuts against the front end of the rod cylinder 820). Subsequently, the fixing cylinder 421 is depressurized and reset, causing the flexible extrusion block 422 to move downward, releasing the pressure on the copper tube. Simultaneously, the servo motor is started, driving the lead screw 130 to rotate, causing the slide 750 to continue moving forward. The limiting chain 710 between the last carriage 740 and the last carriage 740 pulls the last carriage 740 forward, and the multiple tubes 760 follow suit. When the second carriage 750 abuts against the first carriage 740 at its front through the anti-collision bar, the first carriage 740 at that position moves forward, providing space for the second carriage 750 to drive the tubes 760 forward. As the tubes 760 continue to move forward, they push the multiple bent copper tubes forward, thus pushing the multiple bent copper tubes forward. The parts of the copper tubes located inside the guide assembly 500 and the bending assembly 400 move forward synchronously and are finally pushed out, where they are received by the external receiving module (the external receiving module can be installed below the bending assembly 400). Then the servo motor starts again, driving the lead screw 130 to rotate in the reverse direction, causing the slide 1 740 to retract and reset. The slide 2 750 drives the front slide 1 740 to retract and reset through the limit chain 710, and the equipment enters the next working cycle.

[0041] By using a series of spherical blocks (1 to 6) consisting of steel balls 920, 930, and 940, the traditional single-ball support is replaced. This structure forms multiple continuous surface contact supports with the inner wall of the copper tube, effectively covering the entire area of ​​bending plastic deformation. It can simultaneously constrain the non-uniform flow of metal in the deformation zone during the bending process, controlling the inner collapse of the ultra-thin copper tube after bending to within 0.05mm and the outer wall thickness reduction rate to within 8%, which is far superior to the industry standard and eliminates micro-crack defects. It is perfectly adapted to the synchronous processing of multiple densely arranged ultra-thin copper tubes. Through the coaxial guiding design of the guide component 500, docking table 600 and pushing component 700, it ensures that multiple copper tubes are coaxially aligned throughout the feeding, core insertion and bending process. The resistance of tube insertion and core pulling is small, and there are no problems such as inner wall scratches and steel ball jamming, which meets the requirements of large-scale continuous production. The overall structure features a modular design, with the bending component 400, bending table 200, and pushing component 700 all capable of quick disassembly and replacement. This allows for the processing of copper tubes for radiators of different specifications and in different numbers of connections. No additional melting or cleaning processes are required, eliminating the risk of alloy residue contamination and significantly reducing production costs. By using the built-in return spring 830 of the short bar 800 in conjunction with the wire rope 910, adaptive deflection and displacement margins can be provided for steel ball 1 920, steel ball 2 930, and steel ball 3 940 during bending, avoiding support lag or wire rope 910 breakage due to tension, improving the stability and service life of the equipment, and reducing maintenance costs.

[0042] As a second embodiment of the present invention: Please see Figures 1 to 8 as well as Figures 13 to 16 The anti-deformation component 900 includes a steel wire rope 910. The rear end of the steel wire rope 910 is fastened to the connecting block 810 through a locking buckle 950 and a fixing hole 813. The locking buckle 950 has a threaded blind hole 952 opened inward on the top and bottom sides respectively. The locking buckle 950 includes a rib and a locking screw 953. The upper and lower sides of the front surface of the rib 951 extend backward to form a locking hole 954. Each locking hole 954 is threaded with a locking screw 953 for locking the wire rope. The upper locking hole 954 is perpendicularly connected to the upper threaded blind hole 952, and the lower locking hole 954 is perpendicularly connected to the lower threaded blind hole 952. Steel ball 920, steel ball 930 and steel ball 940 are slidably mounted in series at the front end of steel wire rope 910. Spherical block 922 is slidably mounted on the front side of steel ball 920 through steel wire rope 910, and spherical block 921 is slidably mounted on the rear side of steel ball 920 through steel wire rope 910. A spherical block 4 932 is slidably mounted on the front side of steel ball 2 930 via steel wire rope 910; a spherical block 3 931 is slidably mounted on the rear side of steel ball 2 930 via steel wire rope 910; a spherical block 6 942 is slidably mounted on the front side of steel ball 3 940 via steel wire rope 910; and a spherical block 5 941 is slidably mounted on the rear side of steel ball 3 940 via steel wire rope 910. Multiple washers (1) for positioning steel ball 2 (930) are slidably installed between spherical block 2 (922) and spherical block 3 (931) in series via steel wire rope 910. Similarly, multiple washers (2) for positioning steel ball 3 (940) are slidably installed between spherical block 4 (932) and spherical block 5 (941) in series via steel wire rope 910. In actual use, the outer diameters of steel ball 1 (920), steel ball 2 (930), and steel ball 3 (940) are clearance-fitted with the inner diameter of the copper tube to be processed, with a single-sided clearance of 0.03mm. The spherical ends of the spherical blocks are in contact with the spherical surfaces of the corresponding steel balls, ensuring that the steel balls can adaptively deflect with the bending of the copper tube during bending, forming continuous support.

[0043] Furthermore, for different bending radii, the axial spacing between steel ball 1 (920) and steel ball 2 (930), and between steel ball 2 (930) and steel ball 3 (940) can be significantly shortened by adjusting the number of washers 1 and 2, so that the support area of ​​the three sets of steel balls completely covers the bending plastic deformation zone. At the same time, the single-sided fit clearance between the outer diameter of steel ball 1 (920), steel ball 2 (930), and steel ball 3 (940) and the inner diameter of the copper tube to be processed is controlled at 0.02mm, further reducing support lag and improving support accuracy. The spherical curvature of the spherical block is perfectly matched with the spherical curvature of the corresponding steel ball, ensuring that the steel ball can smoothly and adaptively deflect with the extremely small radius of the copper tube during bending, without jamming or local stress concentration. Based on the length and minimum bending radius requirements of the ultra-thin copper tubes to be processed, the front and rear positions of the guide assembly 500 sliding frame 510 and the docking table 600 sliding block 620 are adjusted and locked using screw knobs; the rotation angle of the drive assembly 300 driving the rotating disk 320 is preset to 180°, and the rotation process adopts segmented speed control of slow first, then fast and then slow again to avoid instantaneous deformation and loss of control during the bending of the ultra-thin wall tubes; the feeding stroke of the servo motor, the pushing stroke of the push cylinder 110, and the clamping force of the fixing cylinder 421 are preset to prevent damage to the thin-walled copper tubes; multiple ultra-thin copper tubes to be processed are sequentially inserted into the guide tube 440 of the bending assembly 400, the second pad 410, the first pad 220 of the bending table 200, the guide tube 520 of the guide assembly 500, and the docking table 600. The positioning table 610 completes the waiting for materials. The subsequent copper tube feeding and positioning stage, copper tube clamping and short bar 800 and anti-deformation component 900 pushing stage, copper tube bending and forming stage, anti-deformation component 900 retraction and unclamping unloading stage are all the same as in the above embodiment. By optimizing the axial spacing and fitting accuracy of steel ball 1 (920), steel ball 2 (930), and steel ball 3 (940), a continuous rigid support covering the bending plastic deformation zone is achieved to meet the requirements of different bending radii. By adapting the clamping force of the flexible extrusion block 422, combined with the segmented bending speed control and stable feeding design, the movement of the ultra-thin-walled tube during the bending process is avoided, and the problems of crushing and scratching the copper tube are eliminated. The short bar 800 has a built-in return spring 830 that works in conjunction with the wire rope 910. This structure can accommodate the large-angle deflection requirements of steel balls 920, 930, and 940 during extremely small radius bending, providing precise displacement compensation, avoiding support lag and structural damage. The equipment has strong operational stability, low maintenance costs, and can meet the requirements of large-volume, high-consistency production.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bending mandrel-shaped U-bending machine for ultra-thin radiator tubes, comprising: A frame (100), a bending table (200), a drive assembly (300), a bending assembly (400), a guide assembly (500), and a docking platform (600) are characterized in that a bending table (200) for bending copper tubes is installed on the upper front side of the frame (100); a drive assembly (300) for providing the power required for bending is installed on the left, right, and inside front of the frame (100); a bending assembly (400) for fixing copper tubes and bending copper tubes together with the bending table (200) is installed at the front of the frame (100) through the drive assembly (300); and a guide assembly (500) for guiding the copper tubes is installed at the upper front end of the frame (100) through a screw knob. The upper front side of the frame (100) is equipped with a docking platform (600) for positioning and guiding the copper tube via a screw knob. The upper side of the frame (100) is slidably equipped with a pushing component (700) for positioning the copper tube. The front end of the pushing component (700) is equipped with a plurality of short rods (800) for installing anti-deformation components (900). Each short rod (800) has an anti-deformation component (900) installed inside and on the front side for extending into the copper tube and preventing deformation when the copper tube is bent.

2. The bending mandrel long U-bending machine for ultra-thin radiator tubes as described in claim 1, characterized in that: The frame (100) includes a base (140), and a mounting platform (120) for mounting a push cylinder (110) is bolted to the upper rear end of the base (140). A servo motor for driving a lead screw (130) is mounted on the upper rear end of the base (140). The servo motor is placed on the underside of the mounting platform (120), and a lead screw (130) for driving the push assembly (700) is rotatably mounted inside the upper side of the base (140) via a bearing. The rear end of the lead screw (130) is connected to the output shaft of the servo motor via a coupling shaft, and the upper left and right sides of the base (140) are respectively equipped with slide rails (150) for sliding installation of the push assembly (700).

3. The bending mandrel long U-bending machine for ultra-thin radiator tubes as described in claim 2, characterized in that: The front left and right sides of the base (140) are respectively provided with a vertical plate for installing the drive assembly (300), and the outer sides of the two vertical plates are respectively provided with a mounting plate (310) for installing the bearing seat. Each of the two mounting plates (310) has a bearing seat with a bearing installed on its outer side. The outer sides of the two mounting plates (310) are bolted with a protective outer shell. The inner sides of the two vertical plates are rotatably mounted with a rotating disk (320) for directly driving the bending assembly (400) to bend via a rotating shaft and a bearing seat with a bearing.

4. The U-bending machine for bending the core of an ultra-thin radiator tube as described in claim 3, characterized in that: The bending table (200) includes a workbench (210), which is installed on the upper front side of the machine base (140). Multiple equidistant pads (220) are installed on the upper front side of the workbench (210) from left to right. The front ends of the plurality of pad blocks (220) extend forward from the upper side of the front end of the workbench (210), and a guide groove (221) for supporting and guiding the copper tube is formed through the middle of the upper end of each pad block (220) from front to back. The cross-section of the guide groove (221) is a concave semi-circular structure.

5. The bending mandrel long U-bending machine for ultra-thin radiator tubes as described in claim 4, characterized in that: The bending assembly (400) includes a tilting table (420), the left rear side and the right rear side of the tilting table (420) are fixedly connected to the rotating disk (320) on the left side and the rotating disk (320) on the right side of the base (140) by bolts respectively; Multiple pads (410) for fixing and guiding copper pipes are installed on the front side of the upper end of the flipping table (420). A cantilever frame (450) for providing a support base is installed on the front side of the flipping table (420) by bolts. A fixing frame (430) for fixing the guide pipe (440) is installed on the upper front side of the cantilever frame (450) and the flipping table (420). The fixed frame (430) is equipped with a plurality of equally spaced guide tubes (440), and each of the pad blocks (410) is provided with a bending mold (460) for U-shaped bending of the copper tube on the upper rear end. Each of the pad blocks (410) has a recessed semi-circular cross-section formed by a recessed groove (411) extending backward from the middle of the front side of the upper end. The cross-sectional radius of the recessed groove (411) is the same as that of the guide groove (221). Each of the pad blocks (410) has a through hole (412) extending backward from the lower end to form a guide hole for the copper tube. The axis of the through hole (412) is collinear with the axis of the guide tube (440), and the inner diameter of the through hole (412) is the same as the inner diameter of the guide tube (440). The number and distribution of the through holes (412) are matched with the number and distribution of the guide tubes (440). Each of the pad blocks (410) has a rectangular groove formed by an upward indentation at its lower end. The lower end of the flipping table (420) is provided with an installation cavity. Multiple fixed cylinders (421) are installed at equal intervals on the top of the installation cavity. The number and distribution of the fixed cylinders (421) are matched with the number and distribution of the pad blocks (410). The piston rod of each of the fixed cylinders (421) extends upward through the flipping table (420) and into the rectangular groove of the corresponding upper pad block two (410), and the upper side of the piston rod is slidably connected to the upper part of the flipping table (420). A flexible extrusion block (422) for temporarily fixing the copper tube is installed at the top of the piston rod. The upper end of the flexible extrusion block (422) is recessed downward to form a concave arc groove. The diameter of the concave arc groove is the same as the diameter of the through hole (412). The flexible extrusion block (422) extends upward to the bottom of the through hole (412) through the piston rod. The bending mold (460) has an inwardly recessed outer wall to form a bending groove (461). The vertical and longitudinal sections of the bending groove (461) are both U-shaped. The bottom of the upper end of the bending groove (461) is flush with the bottom of the relief groove (411). The top of the lower end of the bending groove (461) is flush with the top of the through hole (412). The bottom of the through hole (412) is flush with the bottom of the guide groove (221).

6. The bending mandrel long U-bending machine for ultra-thin radiator tubes as described in claim 5, characterized in that: The guide assembly (500) includes a plurality of sliding frames (510), which are fixedly connected to the slide rail (150) at the upper end of the base (140) by screws, knobs and sliders. Each of the sliding frames (510) has multiple equally spaced conduits (520) fixed from front to back. The distribution position and number of the conduits (520) on each of the sliding frames (510) are the same as the distribution position and number of the delivery tubes (440). The docking platform (600) is located directly behind the guide assembly (500). The docking platform (600) includes a slide (620). The slide (620) is fixedly connected to the slide rail (150) at the upper end of the base (140) by a screw knob and a slider. A positioning platform (610) for guiding the copper tube is fixed to the middle of the upper side of the slide (620) by bolts. A strip-shaped fixing plate (630) is fixed on the upper front side of the positioning platform (610). A plurality of equidistant connecting pipes (640) are provided between the fixing plate (630) and the positioning platform (610). The front ends of the plurality of connecting pipes (640) extend forward and penetrate through the fixing plate (630). A plurality of positioning holes are formed by penetrating the front surface of the positioning platform (610) backward. The number and distribution of the plurality of positioning holes are matched with the number and distribution of the connecting pipes (640). The axis of the positioning holes is collinear with the axis of the connecting pipes (640), and the rear end of the connecting pipes (640) abuts against the front surface of the positioning platform (610). The pushing component (700) is located on the rear side of the docking platform (600). The pushing component (700) includes a first slide (740) and a second slide (750). The rear side of the second slide (750) is connected to a first slide (740) via a limiting chain (710). The front side of the first slide (740) is connected to two equally spaced first slides (740) via a limiting chain (710). One slide 2 (750) and three slides 1 (740) are slidably connected to the slide rail (150) on the upper side of the machine base (140) by a slider. A connecting plate (751) is welded to the lower end of the slide 2 (750). A screw nut is installed at the lower end of the connecting plate (751) and is connected to the screw rod (130) through the screw nut. Multiple through pipes (760) are installed from front to back in one slide 2 (750) and three slides 1 (740). The axes of the multiple through pipes (760) are collinear with the axes of the multiple connecting pipes (640) and the positioning holes. The multiple through pipes (760) are slidably connected to the three slides (740) in the front-back direction. The multiple through pipes (760) are fixedly connected to the slide (750). The length of the through pipe (760) is greater than the length of the slide (750) and the three slides (740) when extended to their maximum stroke. The pushing assembly (700) also includes a top plate (720), the rear end of which is fixedly connected to the front end of the piston rod of the pushing cylinder (110), the top plate (720) is slidably connected to the slide rail (150) on the upper side of the base (140) via a slider four, and multiple push rods (730) are fixed on the front side of the top plate (720). Multiple top rods (730) are slidably connected to multiple through pipes (760), and the length of the top rod (730) is greater than the length of the through pipe (760). The axis of the top rod (730) is collinear with the axis of the through hole (412). A bumper post is welded to the left and right sides of the front surface of one slide (750) and three slides (740).

7. The bending mandrel long U-bending machine for ultra-thin radiator tubes as described in claim 6, characterized in that: The short rod (800) includes a rod cylinder (820), and a return spring (830) and a limiting circular plate (840) are installed inside the rear end of the rod cylinder (820). The rear side of the return spring (830) is welded and fixed to the limiting circular plate (840). The limiting circular plate (840) is placed at the rear end of the return spring (830). A screw (850) is welded to the middle of the front side of the limiting circular plate (840). The front side of the screw (850) is fixedly threaded to the connecting block (810). The connecting block (810) includes a long nut (811). The rear side of the long nut (811) is provided with an internal thread hole (814) for connecting with the screw (850). The front end of the long nut (811) is integrally formed with a connecting rod (812). The connecting rod (812) has a fixed hole (813) formed by passing through from top to bottom at the front end. A limiting plate (821) is welded inside the front end of the rod cylinder (820). A through hole (822) is formed by passing through from front to back in the middle of the limiting plate (821). A fixed plane (823) is provided on the upper and lower sides of the rear end of the rod cylinder (820) in an axially symmetrical structure. Both of the fixed planes (823) are recessed inward to form a blind hole. The rod cylinder (820) is fixed inside the front end of the top rod (730) by screws, and the front end of the rod cylinder (820) extends out of the front end of the top rod (730).

8. The bending mandrel long U-bending machine for ultra-thin radiator tubes as described in claim 7, characterized in that: The anti-deformation component (900) includes a steel wire rope (910). The rear end of the steel wire rope (910) is fastened to the connecting block (810) through a locking buckle (950) and a fixing hole (813). The locking buckle (950) has a threaded blind hole (952) on its upper and lower sides respectively. The locking buckle (950) includes a rib and a locking screw (953). The upper and lower sides of the front surface of the rib (951) respectively extend backward to form a locking hole (954). Each locking hole (954) is threaded with a locking screw (953) for locking the wire rope. The upper locking hole (954) is perpendicularly connected to the upper threaded blind hole (952), and the lower locking hole (954) is perpendicularly connected to the lower threaded blind hole (952). The front end of the wire rope (910) is slidably connected with steel ball one (920), steel ball two (930) and steel ball three (940). A spherical block two (922) is slidably connected to the front side of steel ball one (920) via the wire rope (910), and a spherical block one (921) is slidably connected to the rear side of steel ball one (920) via the wire rope (910). A spherical block four (932) is slidably mounted on the front side of the second steel ball (930) via a steel wire rope (910), a spherical block three (931) is slidably mounted on the rear side of the first steel ball (920) via a steel wire rope (910), a spherical block six (942) is slidably mounted on the front side of the third steel ball (940) via a steel wire rope (910), and a spherical block five (941) is slidably mounted on the rear side of the first steel ball (920) via a steel wire rope (910). Multiple washers for positioning steel ball two (930) are slidably installed between spherical block two (922) and spherical block three (931) via steel wire rope (910), and multiple washers for positioning steel ball three (940) are slidably installed between spherical block four (932) and spherical block five (941) via steel wire rope (910).

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