A pipe forming device for a pipe sheet type radiator

Abstract

The application discloses a pipe forming device for a pipe piece type radiator and relates to the technical field of pipe forming devices.The pipe forming device comprises a rack, two mounting seats are fixedly connected to the inner side of the rack, first hydraulic cylinders are mounted on the inner side of each of the two mounting seats, a second transverse linear module is fixedly connected to the output end of each of the first hydraulic cylinders and penetrates through the bottom of the mounting seat, and two first transverse linear modules are mounted on the inner side of the rack.A synchronous bucking mechanism is arranged, the bucking head gradually increases the bucking angle to the final section, the top limiting position is gradually released during the bucking process, the symmetric stress characteristics of the four-position bucking head are matched, and thus the problems of material stacking, wrinkle, stress concentration, instability collapse and cross-section eccentric distortion are avoided, the cross-section symmetry of the workpiece is ensured, and the forming precision is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of tube forming apparatus, specifically a tube forming apparatus for tube-plate radiators. Background Technology

[0002] Tubular radiators are a classic and mature structure in the field of liquid cooling heat exchange. The core consists of multiple parallel flat cooling tubes and dense corrugated heat dissipation fins stacked alternately and connected by brazing. At both ends, liquid collection chambers and inlet and outlet ports are configured to form a complete cooling flow channel. With its advantages such as high heat exchange efficiency per unit volume, excellent structural strength, good vibration resistance, and mature manufacturing process, it is widely used in automotive engine cooling, thermal management of construction machinery, and HVAC systems.

[0003] Existing tube-forming devices for tube-type heat sinks typically use coiled aluminum or strip as raw material. The process involves uncoiling, strip leveling, progressive roll bending into a tube blank, high-frequency welding to seal the joint, weld grinding, sizing and straightening, and finally servo-driven length cutting to output shaped heat sink tubes that meet specifications for subsequent core assembly. After the tube-forming process is completed, the core assembly stage begins, where the spaced heat sink flat tubes and heat sink fins are stacked and pressed together. However, traditional pressing devices often use single-sided step-by-step pressing or asynchronous pressing methods, resulting in uneven circumferential stress on the workpiece. This can easily lead to problems such as cross-sectional eccentricity and distortion, out-of-tolerance contour symmetry, and insufficient straightness after the pressing plate is formed. At the same time, rigid top constraints can easily cause material accumulation and wrinkling in the pressing area, stress concentration, and even tube wall instability and collapse, making it impossible to reliably guarantee forming accuracy. Summary of the Invention

[0004] The purpose of this invention is to address the problems that traditional clamping devices often use single-sided step-by-step or asynchronous clamping, which can easily lead to cross-sectional eccentricity and distortion, as well as deviations in symmetry and straightness due to uneven circumferential force on the workpiece. At the same time, rigid top constraints can easily cause material accumulation and wrinkling in the clamping area, stress concentration, or even tube wall collapse, making it difficult to stably ensure forming accuracy. Therefore, this invention provides a tube forming device for tube-type radiators.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a tube forming device for a tube-plate radiator, comprising: a frame, two mounting seats fixedly connected to the inner side of the frame, a first hydraulic cylinder mounted on the inner side of each of the two mounting seats, the output end of the first hydraulic cylinder extending through to the bottom of the mounting seat and fixedly connected to a second transverse linear module, two first transverse linear modules fixedly mounted on the inner side of the frame, heat dissipation fins provided on the inner side of the frame, heat dissipation flat tubes provided on the top of the heat dissipation fins, and multiple clamping plates fixedly connected to the top of the heat dissipation fins; a synchronous clamping mechanism, the synchronous clamping mechanism being disposed on the inner side of the frame for synchronously clamping the clamping plates, the synchronous clamping mechanism comprising four mounting plates opened on the inner side of the frame, and the four mounting plates being respectively fixedly connected to the output ends of the two first transverse linear modules and the two second transverse linear modules, and a clamping head being disposed on one side of each of the four mounting plates; and an adaptive adjuster, the adaptive adjuster being disposed on one side of the clamping head for adjusting the buffer resistance between the clamping head and the clamping plate.

[0006] As a further embodiment of the present invention: the synchronous clamping mechanism further includes a second hydraulic cylinder fixedly connected to one side of the mounting plate, and the output end of the second hydraulic cylinder extends through to the other side of the mounting plate and is fixedly connected to a connecting block. A fixed seat is fixedly connected to one side of the connecting block, and an adaptive moving component is provided on one side of the fixed seat.

[0007] As a further embodiment of the present invention: the adaptive moving component includes a third hydraulic cylinder fixedly connected to the inner side of the fixed base, the output end of the third hydraulic cylinder extending through to one side of the fixed base and fixedly connected to a sliding block, the outer wall of the sliding block being slidably connected to a connecting frame, the inner side of the connecting frame being rotatably connected to a connecting shaft, and one side of the connecting shaft being fixedly connected to a drive ring.

[0008] As a further embodiment of the present invention: the adaptive moving component further includes a connecting plate fixedly connected to one side of the fixed base, and a small cylinder is fixedly connected to one side of the connecting plate, and the small cylinder is sleeved on the inner side of the drive ring.

[0009] As a further embodiment of the present invention: the adaptive adjuster includes a rotating plate fixedly connected to one side of the connecting frame, the inner side of the rotating plate is provided with a piston rod slidably connected thereto, and the piston rod is fixedly connected to the pressing head.

[0010] As a further embodiment of the present invention: the adaptive regulator further includes a piston plate slidably connected to the inner side, and a return spring is installed between the piston plate and the piston rod, and a connecting pipe is installed at the liquid inlet, and a linkage component is provided on one side of the rotating plate.

[0011] As a further embodiment of the present invention: the linkage component includes a connecting shell fixedly connected to one end of the connecting frame, a connecting pipe rotatably connected to the inner side of the connecting shell, and the other end of the connecting pipe fixedly connected to the connecting shaft, and a fixing plate fixedly connected to the inner side of the connecting shell.

[0012] As a further embodiment of the present invention: the linkage component further includes a drive motor installed at one end of the connecting shell, and the output end of the drive motor extends through to the inner side of the connecting shell and is fixedly connected to the connecting shaft, and the connecting pipe is installed at the liquid outlet of the connecting shell.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. By setting up a synchronous clamping mechanism, the clamping head gradually raises the clamping angle to the final stage. Throughout the clamping process, the top limit gradually releases the constraint as the angle increases. Combined with the symmetrical force characteristics of the synchronous clamping of the four-way clamping head, problems such as material wrinkling, stress concentration, instability and collapse, and cross-sectional eccentricity and distortion are avoided, thereby ensuring the symmetry of the workpiece cross-section and significantly improving the forming accuracy.

[0015] 2. By setting up an adaptive moving component, the pressing head slides down synchronously during the transverse pressing feed, forming a top-down segmented forming pattern. This allows the already formed area above to form a rigid constraint, limiting the unstable deformation of the sheet material. At the same time, segmented pressing can expel air and gaps, improve the fit of the working surface, and the gradually increasing contact area allows the deformation load to rise slowly, reducing the instantaneous impact on the equipment and thus reducing the wear and fatigue damage of the pressing head.

[0016] 3. By setting an adaptive adjuster, the vertical downward movement corresponding to the unit lateral feed of the clamping head can be changed, thereby adapting to clamping plates of different specifications: For clamping plates with a large aspect ratio, the drive ring tilt angle is increased to increase the downward movement, ensuring that the clamping head completely covers the bending area and avoiding forming blind spots in the lower half; For clamping plates with narrow width and small cross-section, the drive ring tilt angle is reduced to shorten the downward movement distance and prevent the clamping head from excessively pressing the bottom of the workpiece and causing damage.

[0017] 4. By setting up a linkage component, the rotation of the connecting shaft can adjust the buffer resistance of the crimping process through hydraulic transmission. This allows for increased resistance on large-size crimping plates to smoothly apply impact, reduce peak strain in the bending area, and prevent corner cracking and uneven wall thickness reduction. Conversely, it allows for decreased resistance on small-size crimping plates to avoid redundant forming resistance and prevent dents, indentations, and material accumulation and wrinkling in thin-walled areas. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a cross-sectional view of the present invention;

[0020] Figure 3 This is a schematic diagram of the first transverse linear module structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the synchronous clamping mechanism of the present invention;

[0022] Figure 5 This is a partial structural diagram of the synchronous clamping mechanism of the present invention;

[0023] Figure 6 This is a schematic diagram of the adaptive regulator structure of the present invention;

[0024] Figure 7 This is a partial structural diagram of the adaptive regulator of the present invention;

[0025] Figure 8 This is a schematic diagram of the crimping head structure of the present invention.

[0026] In the diagram: 1. Frame; 2. Mounting base; 3. Heat dissipation fins; 4. Heat dissipation flat tube; 5. First transverse linear module; 6. Mounting plate; 7. First hydraulic cylinder; 8. Second transverse linear module; 9. Second hydraulic cylinder; 10. Connecting block; 11. Fixed base; 12. Third hydraulic cylinder; 13. Connecting plate; 14. Clamping plate; 15. Sliding block; 16. Connecting frame; 17. Small cylinder; 18. Drive ring; 19. Connecting shell; 20. Drive motor; 21. Connecting shaft; 22. Connecting pipe; 23. Fixed plate; 24. Rotating plate; 25. Piston rod; 26. Piston plate; 27. Return spring; 28. Clamping head. Detailed Implementation

[0027] 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.

[0028] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0029] Please see Figures 1 to 8 This embodiment provides a tube forming device for a tube-type radiator, comprising: a frame 1, two mounting seats 2 fixedly connected to the inner side of the frame 1, a first hydraulic cylinder 7 mounted on the inner side of each mounting seat 2, the output end of the first hydraulic cylinder 7 extending through to the bottom of the mounting seat 2 and fixedly connected to a second transverse linear module 8, two first transverse linear modules 5 fixedly mounted on the inner side of the frame 1, heat dissipation fins 3 provided on the inner side of the frame 1, heat dissipation flat tubes 4 provided on the top of the heat dissipation fins 3, and multiple clamping plates 14 fixedly connected to the top of the heat dissipation fins 3; and a synchronous clamping mechanism, which is located on the inner side of the frame 1. The synchronous clamping mechanism is used to simultaneously clamp the clamping plate 14. The synchronous clamping mechanism includes four mounting plates 6 opened inside the frame 1, and the four mounting plates 6 are respectively fixedly connected to the output ends of two first transverse linear modules 5 and two second transverse linear modules 8. Each of the four mounting plates 6 is provided with a clamping head 28 on one side. The synchronous clamping mechanism also includes a second hydraulic cylinder 9 fixedly connected to one side of the mounting plate 6. The output end of the second hydraulic cylinder 9 extends through to the other side of the mounting plate 6 and is fixedly connected to a connecting block 10. A fixed seat 11 is fixedly connected to one side of the connecting block 10, and an adaptive moving component is provided on one side of the fixed seat 11.

[0030] The first transverse linear module 5 and the second transverse linear module 8 are both composed of components such as module base, moving slide, linear guide rail and servo motor, which can drive the output end of the second transverse linear module 8 of the first transverse linear module 5 to reciprocate. Since this technology is existing technology, it is not described in detail in this solution.

[0031] A limit mechanism and a PLC controller are installed inside the frame 1: the limit mechanism can form a positioning constraint on the heat dissipation fins 3 and the heat dissipation flat tube 4, and the PLC controller is used to control the start and stop status of the limit mechanism. Before the clamping process is performed, the operator controls the robot to move the heat dissipation fins 3 and the heat dissipation flat tube 4 to the corresponding installation position inside the frame 1. After both workpieces are in place, the PLC controller outputs a control signal to drive the limit mechanism to start and complete the positioning and locking of the heat dissipation fins 3 and the heat dissipation flat tube 4.

[0032] A PLC controller is installed inside the frame 1, which can intermittently start and stop the first horizontal linear module 5, the first hydraulic cylinder 7, and the second horizontal linear module 8. After the heat dissipation fins 3 and the heat dissipation flat tubes 4 are fixed in place, the PLC controller first controls the first hydraulic cylinder 7 to start, driving the second horizontal linear module 8 to move downward. When the end of the clamping head 28 is slightly lower than the end of the clamping plate 14, the second horizontal linear module 8 stops moving. Then, the PLC controller controls the first hydraulic cylinder 7 and the second horizontal linear module 8 to start, driving the mounting plate 6 to move along the linear guide rail, and moving the four clamping heads 28 to the center position around the heat dissipation fins 3.

[0033] Both the second hydraulic cylinder 9 and the third hydraulic cylinder 12 are controlled by a PLC controller, enabling intermittent start-stop management. When the four clamping heads 28 move to the center position around the heat dissipation fins 3, the PLC controller outputs a control signal to start the second hydraulic cylinder 9, driving the four clamping heads 28 to synchronously feed towards the clamping plate 14. After the clamping heads 28 contact the clamping plate 14, the second hydraulic cylinder 9 stops running, and then the PLC controller controls the four third hydraulic cylinders 12 to start synchronously, driving the four clamping heads 28 to synchronously press against the clamping plate 14. To perform the clamping operation, the third hydraulic cylinder 12 first drives the clamping head 28 to clamp to the first preset angle. After reaching the target angle, the PLC controller controls the third hydraulic cylinder 12 to maintain the current state for a short period of pressure holding. Then, it reverses to release the force and drives the second hydraulic cylinder 9 to drive the clamping head 28 to synchronously retract to the initial avoidance position. After that, the PLC controller controls the first horizontal linear module 5 and the second horizontal linear module 8 to start synchronously, driving the four clamping heads 28 to move as a whole to the corresponding workstation of the next set of clamping plates 14 on the side, and repeats the above process. The entire process of feeding, contacting, and clamping to the first preset angle is completed sequentially, forming the first stage of clamping of all the arranged clamping plates 14. After all the clamping plates 14 have been clamped to the first preset angle, the PLC controller follows the same workpiece displacement and graded clamping logic, cyclically executing multi-station sequential clamping operations, gradually increasing the clamping angle to complete the second stage and subsequent stages of forming. During the entire graded clamping process, the top limit gradually releases the top constraint on each group of clamping plates 14 as the clamping angle increases, preparing for the plastic deformation of the workpiece. By leaving room for adjustment, we can avoid wrinkling and stress concentration caused by excessive rigid constraints at the top, as well as prevent the pipe wall from becoming unstable and collapsing due to excessive constraints. All clamping plates 14 are clamped to the preset angle at the end by the clamping heads 28. The four clamping heads 28 perform clamping actions simultaneously, which can make the circumferential force on the workpiece completely symmetrical. The cross section always remains in a centered state during the forming process, which avoids problems such as eccentricity, cross section distortion, and straightness deviation caused by unilateral force from the root, and ensures the symmetry of the cross section profile after forming, ultimately significantly improving the forming accuracy of the workpiece.

[0034] Please see Figures 2-6 The adaptive movement assembly includes a third hydraulic cylinder 12 fixedly connected to the inner side of the fixed base 11. The output end of the third hydraulic cylinder 12 extends through to one side of the fixed base 11 and is fixedly connected to a sliding block 15. A connecting frame 16 is slidably connected to the outer wall of the sliding block 15. A connecting shaft 21 is rotatably connected to the inner side of the connecting frame 16, and a drive ring 18 is fixedly connected to one side of the connecting shaft 21. The adaptive movement assembly also includes a connecting plate 13 fixedly connected to one side of the fixed base 11. A small cylinder 17 is fixedly connected to one side of the connecting plate 13, and the small cylinder 17 is sleeved on the inner side of the drive ring 18.

[0035] When the four clamping heads 28 are fed laterally toward the clamping plate 14, the small cylinder 17 synchronously outputs power to drive the drive ring 18 to move downward. The drive ring 18 drives the connecting frame 16 to move downward synchronously, thereby driving the clamping heads 28 to slide downward synchronously with the lateral clamping action. This ensures that the area above that has been clamped is in contact with the mold to form a rigid constraint, which is equivalent to providing a stable support boundary for the area to be deformed below. This greatly limits the out-of-plane instability deformation of the plate. At the same time, during the step-by-step pressing process, the working surface of the clamping head 28 gradually presses and adheres to the side wall of the clamping plate 14 from top to bottom, which can expel the air and assembly gap between the two and achieve a tight fit of the entire working surface. The contact area between the clamping head 28 and the clamping plate 14 gradually increases with the downward process, and the deformation load rises slowly with the feed without instantaneous impact peaks. This can reduce the instantaneous load impact of the equipment and reduce the impact wear and fatigue damage of the working surface of the clamping head 28.

[0036] Please see Figures 1 to 8 An adaptive regulator is located on one side of the snap head 28 and is used to adjust the buffer resistance between the snap head 28 and the snap plate 14. The adaptive regulator includes a rotating plate 24 fixedly connected to one side of the connecting frame 16. A 31 is formed on the inner side of the rotating plate 24, and a piston rod 25 is slidably connected to the inner side of the 31, and the piston rod 25 is fixedly connected to the snap head 28. The adaptive regulator also includes a piston plate 26 slidably connected to the inner side of the 31, and a return spring 27 is installed between the piston plate 26 and the piston rod 25. A connecting spring is installed at the inlet of the 31. A linkage assembly is provided on one side of the connecting pipe 22 and the rotating plate 24. The linkage assembly includes a connecting shell 19 fixedly connected to one end of the connecting frame 16, a connecting pipe 22 rotatably connected to the inner side of the connecting shell 19, and the other end of the connecting pipe 22 fixedly connected to the connecting shaft 21. A fixing plate 23 is fixedly connected to the inner side of the connecting shell 19. The linkage assembly also includes a drive motor 20 installed at one end of the connecting shell 19, and the output end of the drive motor 20 extends through to the inner side of the connecting shell 19 and is fixedly connected to the connecting shaft 21. The connecting pipe 22 is installed at the liquid outlet of the connecting shell 19.

[0037] When performing a clamping operation on a clamping plate 14 with larger cross-sectional width and height specifications, the PLC controller outputs a control signal to start the drive motor 20. The drive motor 20 drives the connecting shaft 21 to rotate counterclockwise, which in turn drives the drive ring 18 to deflect counterclockwise synchronously, increasing the tilt angle of the drive ring 18 itself. When the third hydraulic cylinder 12 drives the clamping head 28 to perform lateral clamping feed on the clamping plate 14, under the influence of the increased tilt angle of the drive ring 18 and the power output of the small cylinder 17, the vertical direction of the clamping head 28 within a unit lateral feed distance is affected. The downward movement distance is increased synchronously to match the longer vertical span of the bending area of ​​the large-size clamping plate 14. For clamping plates 14 with a large aspect ratio, the vertical span of the bending area is larger. The unit feed downward movement can be increased by increasing the tilt angle of the drive ring 18 to ensure that the clamping head 28 completely covers the entire bending area and avoids forming blind spots in the lower half. For clamping plates 14 with a narrow width and small cross section, the vertical span of the bending area is smaller. The tilt angle of the drive ring 18 is adjusted to narrow the downward movement distance to avoid the clamping head 28 pressing the bottom of the clamping plate 14 too much and causing damage.

[0038] While the connecting shaft 21 rotates, it drives the connecting pipe 22 to rotate synchronously, pushing the hydraulic oil inside the connecting shell 19 to flow inside the 31, thereby driving the piston plate 26 to move towards the piston rod 25 and compressing the return spring 27. This increases the buffer resistance between the crimping head 28 and the crimping plate 14. For large-sized crimping plates 14, which have higher deformation resistance and larger peak forming load, increasing the damping coefficient can smooth the load loading process, absorb the instantaneous impact of crimping feed, reduce the peak strain in the bending area of ​​the crimping plate 14, and avoid cracking and uneven wall thickness reduction on the outer side of the rounded corner due to instantaneous tensile overload. For small-sized crimping plates 14, decreasing the damping coefficient can avoid redundant forming resistance caused by excessive constraint and prevent forming defects such as dents, indentations, and material accumulation wrinkling in thin-walled areas due to excessive extrusion load.

[0039] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A tube-forming apparatus for a tube-plate radiator, characterized in that, include: The frame has two mounting seats fixedly connected to its inner side. A first hydraulic cylinder is installed on the inner side of each of the two mounting seats. The output end of the first hydraulic cylinder extends through to the bottom of the mounting seat and is fixedly connected to a second transverse linear module. Two first transverse linear modules are fixedly installed on the inner side of the frame. Heat dissipation fins are provided on the inner side of the frame. A heat dissipation flat tube is provided on the top of the heat dissipation fins. Multiple clamping plates are fixedly connected to the top of the heat dissipation fins. A synchronous clamping mechanism is disposed on the inner side of the frame and is used to synchronously clamp the clamping plates. The synchronous clamping mechanism includes four mounting plates opened on the inner side of the frame, and the four mounting plates are respectively fixedly connected to the output ends of the two first transverse linear modules and the two second transverse linear modules, and a clamping head is provided on one side of each of the four mounting plates. An adaptive adjuster is disposed on one side of the crimping head and is used to adjust the buffer resistance between the crimping head and the crimping plate.

2. The tube forming apparatus for a tube-plate radiator according to claim 1, characterized in that, The synchronous clamping mechanism further includes a second hydraulic cylinder fixedly connected to one side of the mounting plate, and the output end of the second hydraulic cylinder extends through to the other side of the mounting plate and is fixedly connected to a connecting block. A fixed seat is fixedly connected to one side of the connecting block, and an adaptive moving component is provided on one side of the fixed seat.

3. The tube forming apparatus for a tube-plate radiator according to claim 2, characterized in that, The adaptive moving component includes a third hydraulic cylinder fixedly connected to the inner side of the fixed base. The output end of the third hydraulic cylinder extends through to one side of the fixed base and is fixedly connected to a sliding block. A connecting frame is slidably connected to the outer wall of the sliding block. A connecting shaft is rotatably connected to the inner side of the connecting frame, and a drive ring is fixedly connected to one side of the connecting shaft.

4. The tube forming apparatus for a tube-plate radiator according to claim 3, characterized in that, The adaptive moving assembly also includes a connecting plate fixedly connected to one side of the fixed base, and a small cylinder fixedly connected to one side of the connecting plate, with the small cylinder sleeved inside the drive ring.

5. The tube forming apparatus for a tube-plate radiator according to claim 4, characterized in that, The adaptive adjuster includes a rotating plate fixedly connected to one side of the connecting frame. The inner side of the rotating plate is provided with a piston rod slidably connected thereto, and the piston rod is fixedly connected to the pressing head.

6. The tube forming apparatus for a tube-plate radiator according to claim 5, characterized in that, The adaptive regulator also includes a piston plate slidably connected to the inner side, and a return spring is installed between the piston plate and the piston rod. A connecting pipe is installed at the liquid inlet, and a linkage component is provided on one side of the rotating plate.

7. The tube forming apparatus for a tube-plate radiator according to claim 6, characterized in that, The linkage component includes a connecting shell fixedly connected to one end of the connecting frame, a connecting pipe rotatably connected to the inner side of the connecting shell, and the other end of the connecting pipe fixedly connected to the connecting shaft. A fixing plate is fixedly connected to the inner side of the connecting shell.

8. The tube forming apparatus for a tube-plate radiator according to claim 7, characterized in that, The linkage component also includes a drive motor installed at one end of the connecting shell, and the output end of the drive motor extends through to the inside of the connecting shell and is fixedly connected to the connecting shaft, and the connecting pipe is installed at the liquid outlet of the connecting shell.

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