A u-tube forming device and a u-tube sleeve welding ring machine

Abstract

The utility model discloses a kind of U pipe forming device and U pipe sleeve welding ring machine, including machine base, cut mark mechanism, bending mechanism, pull-off mechanism and pipe feeding mechanism.Cut mark mechanism is set to the machine base, the cut mark mechanism is provided with cut mark knife, the cut mark knife can be relative to the circumferential cut mark of pipe material;Bending mechanism is set to the machine base and is located in the front of the cut mark mechanism, the bending mechanism can be bent into U shape with the pipe material;Pull-off mechanism is set to the machine base and is located between the cut mark mechanism and the bending mechanism, the pull-off mechanism can be pulled off at cut mark with the pipe material between the bending mechanism and the pull-off mechanism;Pipe feeding mechanism is set to the machine base and is located in the rear of the cut mark mechanism, the pipe feeding mechanism can forwardly convey the pipe material and make the pipe material sequentially pass through the cut mark mechanism, the pull-off mechanism and the bending mechanism.

Description

Technical Field

[0001] This utility model relates to condenser manufacturing, and in particular to a U-tube forming device and a U-tube sleeve welding ring machine. Background Technology

[0002] The multiple long U-tubes in a heat exchanger need to be connected by smaller U-tubes to form a continuous refrigerant circuit. These smaller U-tubes are manufactured using a U-tube forming device. Existing U-tube forming devices typically include a base, a cutting mechanism, a bending mechanism, a transfer mechanism, and a tube feeding mechanism. The tube feeding mechanism conveys continuous straight tube material forward to the cutting mechanism, which then cuts the straight tube material into short tubes of a predetermined length. The transfer mechanism then places the short tubes into the bending mechanism, bending them into smaller U-tubes. These smaller U-tubes can then leave the U-tube forming device for further processing. However, the aforementioned U-tube forming device, which involves cutting straight tube material into short tubes and then transferring them to the bending mechanism via the transfer mechanism, requires clamping, handling, and alignment, making the structure and operation of the U-tube forming device complex and resulting in insufficient production efficiency. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a U-tube forming device that simplifies the structure and working process of the U-tube forming device and improves production efficiency.

[0004] This utility model also proposes a U-tube sleeve welding ring machine with the above-mentioned U-tube forming device.

[0005] According to a first aspect of the present invention, a U-tube forming apparatus includes a base, a cutting mechanism, a bending mechanism, a breaking mechanism, and a tube feeding mechanism. The cutting mechanism is disposed on the base and is equipped with a cutting blade capable of making circumferential cuts relative to the outer periphery of the tube material. The bending mechanism is disposed on the base and located in front of the cutting mechanism, capable of bending the tube material into a U-shape. The breaking mechanism is disposed on the base and located between the cutting mechanism and the bending mechanism, capable of breaking the tube material between the bending mechanism and the breaking mechanism at the cut. The tube feeding mechanism is disposed on the base and located behind the cutting mechanism, capable of forwardly feeding the tube material and causing the tube material to sequentially pass through the cutting mechanism, the breaking mechanism, and the bending mechanism.

[0006] According to the first aspect of the present invention, the U-tube forming apparatus has at least the following beneficial effects: the tube feeding mechanism conveys straight tube material forward, and then the straight tube material is cut with an annular cut of a certain tube wall thickness at the cutting mechanism. At this time, the straight tube material is not directly cut off, so that the straight tube material can continue to move forward and pass through the breaking mechanism and the bending mechanism. Then the front section of the straight tube material is bent into a U-shape by the bending mechanism, and the straight tube material between the bending mechanism and the breaking mechanism is broken at the cut mark by the breaking mechanism, thereby producing a small U-tube. This facilitates continuous production, and eliminates the need to cut the straight tube material into short tube materials and then clamp, transport and position them through the transfer mechanism. This simplifies the structure and working process of the U-tube forming apparatus and improves production efficiency.

[0007] According to some embodiments of the present invention, the breaking mechanism includes a breaking clamping assembly and a breaking driver. The breaking clamping assembly can clamp or release the tube material. The breaking clamping assembly is movably disposed on the machine base in the front-back direction. The breaking driver is used to drive the breaking clamping assembly to move back and forth.

[0008] According to some embodiments of the present invention, the pull-off clamping assembly includes a lower pull-off clamp, an upper pull-off clamp, and a pull-off clamping driver. The lower pull-off clamp is slidably disposed on the machine base in the front-back direction. The pull-off driver is connected to the lower pull-off clamp. The upper pull-off clamp is vertically opposite to the lower pull-off clamp. The upper pull-off clamp is slidably disposed on the lower pull-off clamp in the vertical direction. The pull-off clamping driver is disposed on the lower pull-off clamp and is used to drive the upper pull-off clamp to move.

[0009] According to some embodiments of the present invention, the bending mechanism includes a core mold, a flipping mold, and a bending driver. The outer peripheral surface of the core mold is provided with a U-shaped adapter surface. The flipping mold is rotatably disposed on the machine base and can rotate along the U-shaped adapter surface. A tube bending station is formed between the flipping mold and the core mold. The bending driver is used to drive the flipping mold to rotate.

[0010] According to some embodiments of the present invention, the bending mechanism includes a bending clamping seat and a bending clamping driver. The bending clamping seat is slidably disposed on the machine base and can move closer to or further away from the mandrel. The bending clamping driver is used to drive the bending clamping seat to move. A tube clamping position is formed between the bending clamping seat and the mandrel.

[0011] According to some embodiments of the present invention, the bending mechanism further includes a mandrel and a mandrel driver. The mandrel is slidably disposed on the flipping mold so that the mandrel can be inserted into or disengaged from the inner hole of the tube. The mandrel rotates synchronously with the flipping mold.

[0012] According to some embodiments of the present invention, the cutting mechanism further includes a rotating seat, a feed frame, a feed drive assembly, and a rotary driver. The rotating seat is provided with a tube through hole in the front-back direction. The rotating seat is rotatably mounted on the machine base around the central axis of the tube through hole. The rotary driver is used to drive the rotating seat to rotate. The feed frame is movably mounted on the rotating seat along the radial direction of the tube through hole. The cutting blade is mounted on the feed frame. The feed drive assembly is used to drive the feed frame to move.

[0013] According to some embodiments of this utility model, at least two feed frames are provided and evenly arranged around the central axis of the tube through hole. One feed frame is equipped with the cutting blade, and the other feed frames are equipped with tube wall limiting wheels. The rotation axis of the tube wall limiting wheels is parallel to the central axis of the tube through hole.

[0014] According to some embodiments of the present invention, the pipe feeding mechanism includes a pipe feeding clamping assembly and a pipe feeding driver. The pipe feeding clamping assembly is slidably disposed on the machine base in the front-back direction. The pipe feeding clamping assembly can clamp or release the pipe material. The pipe feeding driver is used to drive the pipe feeding clamping assembly to move.

[0015] The U-tube sleeve welding ring machine according to the second aspect of this utility model adopts the above-mentioned U-tube bending device.

[0016] The U-tube ring welding machine according to the second aspect of the present invention has at least the following beneficial effects: due to the adoption of the above-mentioned U-tube bending device, it is beneficial to simplify the structure of the U-tube ring welding machine and improve the production efficiency of the U-tube ring welding machine.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a three-dimensional schematic diagram of the U-tube sleeve welding ring machine according to an embodiment of the present utility model;

[0020] Figure 2 This is a perspective view of the U-tube bending device according to an embodiment of the present utility model;

[0021] Figure 3 This is a perspective view of the cutting mechanism, bending mechanism, and breaking mechanism of this utility model embodiment;

[0022] Figure 4This is an embodiment of the present utility model. Figure 3 Schematic cross-sectional view along the AA direction;

[0023] Figure 5 This is a perspective view of the cutting mechanism according to an embodiment of the present utility model;

[0024] Figure 6 This is an embodiment of the present utility model. Figure 5 A magnified view of part B.

[0025] Figure label:

[0026] Base 100, collection bucket 110;

[0027] Cutting mechanism 200, cutting knife 210, rotary seat 220, tube through hole 221, feed frame 230, feed drive assembly 240, rotary driver 250, tube wall limiting wheel 260;

[0028] Bending mechanism 300, mandrel 310, U-shaped adapter surface 311, flipping mold 320, bending driver 330, bending clamping seat 340, bending clamping driver 350, mandrel rod 360, mandrel driver 370.

[0029] Pull-off mechanism 400, pull-off clamping assembly 410, pull-off lower clamp 411, pull-off upper clamp 412, pull-off clamping driver 413, pull-off driver 420;

[0030] Pipe feeding mechanism 500, pipe feeding clamping assembly 510, lower pipe feeding clamp 511, upper pipe feeding clamp 512, pipe feeding clamping driver 513, pipe feeding driver 520;

[0031] Conveying device 600;

[0032] U-tube sleeve welding ring device 700. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0034] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0035] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0036] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0037] Reference Figures 1 to 6 The U-tube forming device of this utility model includes a base 100, a cutting mechanism 200, a bending mechanism 300, a breaking mechanism 400, and a tube feeding mechanism 500. A slicing mechanism 200 is disposed on the machine base 100, and the slicing mechanism 200 is provided with a slicing blade 210, which can make circumferential slicing relative to the outer periphery of the tube; a bending mechanism 300 is disposed on the machine base 100 and located in front of the slicing mechanism 200, and the bending mechanism 300 can bend the tube into a U-shape; a breaking mechanism 400 is disposed on the machine base 100 and located between the slicing mechanism 200 and the bending mechanism 300, and the breaking mechanism 400 can break the tube between the bending mechanism 300 and the breaking mechanism 400 at the slicing point; a tube feeding mechanism 500 is disposed on the machine base 100 and located behind the slicing mechanism 200, and the tube feeding mechanism 500 can feed the tube forward and make the tube pass through the slicing mechanism 200, the breaking mechanism 400 and the bending mechanism 300 in sequence.

[0038] The feeding mechanism 500 conveys straight pipe material forward. Then, the straight pipe material is cut with an annular cut of a certain wall thickness at the cutting mechanism 200. At this time, the straight pipe material is not directly cut off, allowing it to continue moving forward and passing through the breaking mechanism 400 and the bending mechanism 300. Subsequently, the front section of the straight pipe material is bent into a U-shape by the bending mechanism 300, and the straight pipe material between the bending mechanism 300 and the breaking mechanism 400 is broken at the cut mark by the breaking mechanism 400, thereby producing a small U-tube. This facilitates continuous production, eliminating the need to cut the straight pipe material into short pipe materials and then clamp, transport, and position them through the transfer mechanism. This simplifies the structure and working process of the U-tube forming device and improves production efficiency.

[0039] Specifically, by cutting annular marks into the tubing and then pulling it apart, burrs at the tubing ends can be reduced, thus improving the quality of the manufactured U-tubes.

[0040] In the embodiments, reference is made to Figure 3The breaking mechanism 400 includes a breaking clamping assembly 410 and a breaking driver 420. The breaking clamping assembly 410 can clamp or release the tube material. The breaking clamping assembly 410 is movably disposed on the machine base 100 in the front-back direction. The breaking driver 420 is used to drive the breaking clamping assembly 410 to move back and forth. When the tube material is bent into a U-shape at the bending mechanism 300, the bending mechanism 300 plays a positioning role for the front end of the tube material. At this time, by driving the breaking clamping assembly 410 to clamp the tube material and move it backward by the breaking driver 420, a pulling effect can be formed, so that the tube material is broken at the cut mark, which facilitates the formation of small U-shaped tubes and facilitates subsequent continuous production.

[0041] In the embodiments, reference is made to Figure 4 The pull-off clamping assembly 410 includes a lower pull-off clamp 411, an upper pull-off clamp 412, and a pull-off clamping driver 413. The lower pull-off clamp 411 is slidably disposed on the base 100 in the front-back direction. The pull-off driver 420 is connected to the lower pull-off clamp 411. The upper pull-off clamp 412 is vertically opposite to the lower pull-off clamp 411 and is slidably disposed on the lower pull-off clamp 411 in the up-down direction. The pull-off clamping driver 413 is disposed on the lower pull-off clamp 411 and is used to drive the upper pull-off clamp 412 to move.

[0042] The aforementioned pull-off clamping assembly 410 can cooperate with the pull-off lower clamping seat 411 to clamp the pipe material when the pull-off clamping driver 413 drives the pull-off upper clamping seat 412 to move downward, and can release the straight pipe material and allow the straight pipe material to move forward when the pull-off upper clamping seat 412 moves upward. The structure is simple and easy to implement.

[0043] Specifically, the break-off clamping actuator 413 is a cylinder, the break-off actuator 420 is a cylinder, and the lower break-off clamp 411 is slidably connected to the machine base 100 via a slide rail slider structure. It is conceivable that the break-off clamping actuator 413 could also be, for example, a hydraulic cylinder or an electric cylinder, and the break-off actuator 420 could also be, for example, a hydraulic cylinder or an electric cylinder. The lower break-off clamp 411 could also be movably connected to the machine base 100 via a structure such as a guide post or guide sleeve. It is conceivable that the break-off clamping assembly 410 could also be a cylinder gripper or an electric gripper.

[0044] In the embodiments, reference is made to Figure 3 and Figure 4The bending mechanism 300 includes a mandrel 310, a flipping die 320, and a bending driver 330. The outer circumferential surface of the mandrel 310 is provided with a U-shaped fitting surface 311. The flipping die 320 is rotatably mounted on the machine base 100 and can rotate along the U-shaped fitting surface 311. A tube bending station is formed between the flipping die 320 and the mandrel 310. The bending driver 330 drives the flipping die 320 to rotate. The front section of the straight tube passes one side of the U-shaped fitting surface 311 and extends to the flipping die 320. The bending driver 330 then drives the flipping die 320 to rotate, causing the straight tube on it to rotate along the U-shaped fitting surface 311, thus bending the front section of the straight tube into a U-shape. A small U-shaped tube is then obtained by pulling it apart. The structure is simple and the bending effect is good.

[0045] Specifically, the bending mechanism 300 includes a bending clamping seat 340 and a bending clamping driver 350. The bending clamping seat 340 is slidably disposed on the machine base 100 and can move closer to or further away from the mandrel 310. The bending clamping driver 350 is used to drive the bending clamping seat 340 to move, and a tube clamping position is formed between the bending clamping seat 340 and the mandrel 310. The bending mechanism 300, with its bending clamping seat 340 and bending clamping driver 350, can clamp and fix the tube outside the mandrel 310, reducing the impact of the tension on the tube inside the bending mechanism 300 at the bending point when the pulling mechanism 400 and the bending mechanism 300 are pulled against each other, thus improving the finished quality of the small U-tube.

[0046] Specifically, the bending clamp 340 is slidably connected to the machine base 100 in the vertical direction. The bending clamp 340 is located on the lower side of the mandrel 310, and the bending clamp driver 350 is a cylinder. The flipping mold 320 can rotate to switch between the front side and the upper side of the mandrel 310. The front end of the mandrel 310 is provided with a U-shaped adapter surface 311, and the bending driver 330 is a motor-driven chain and sprocket structure.

[0047] It is conceivable that in some other embodiments, the bending clamp 340 may also be located on the upper side of the core mold 310. In this case, the flipping mold 320 can be rotated to switch between the front side and the lower side of the core mold 310. The bending driver 330 may also be, for example, an electric cylinder or a hydraulic cylinder. The bending driver 330 may also be, for example, a motor with a reduction gearbox, or an internal combustion engine.

[0048] In the embodiments, reference is made to Figure 3The bending mechanism 300 also includes a mandrel 360 and a mandrel driver 370. The mandrel 360 is slidably disposed on the flipping die 320 so that the mandrel 360 can be inserted into or detached from the end of the tube. The mandrel 360 rotates synchronously with the flipping die 320. The small U-tube has a semi-circular section and straight sections connected to both ends of the semi-circular section. After the mandrel 360 is inserted into the inner hole of the tube, the flipping die 320 rotates to bend the tube, making it less likely for the straight sections of the produced small U-tube to be flattened, thus improving the quality of the small U-tube.

[0049] Specifically, the mandrel rod 360 is mounted on the mandrel seat, which is slidably connected to the flipping mold 320 via a slide rail slider structure, and the mandrel driver 370 is a cylinder. It is conceivable that the mandrel rod 360 could also be slidably mounted on the flipping mold 320 via, for example, a guide post and guide sleeve structure, and the mandrel driver 370 could also be, for example, an electric cylinder or a hydraulic cylinder.

[0050] In the embodiments, reference is made to Figures 4 to 6 The cutting mechanism 200 also includes a rotary seat 220, a feed frame 230, a feed drive assembly 240, and a rotary driver 250. The rotary seat 220 is provided with a tube through hole 221 in the front-back direction. The rotary seat 220 is rotatably mounted on the machine base 100 about the central axis of the tube through hole 221. The rotary driver 250 is used to drive the rotary seat 220 to rotate. The feed frame 230 is movably mounted on the rotary seat 220 in the radial direction of the tube through hole 221. The cutting blade 210 is mounted on the feed frame 230. The feed drive assembly 240 is used to drive the feed frame 230 to move.

[0051] When the feed drive assembly 240 drives the feed frame 230 radially away from the straight pipe material, the straight pipe material is conveyed forward through the pipe material through hole 221. When the straight pipe material is conveyed to a predetermined length, the feed drive assembly 240 can drive the feed frame 230 to move radially toward the straight pipe material, so that the cutting blade 210 makes a cut on the outer wall of the straight pipe material. At the same time, the rotary driver 250 drives the rotary seat 220 to rotate, thereby causing the cutting blade 210 to rotate around the outer circumference of the straight pipe material, forming an annular cut on the outer circumference of the straight pipe material. This eliminates the need for the straight pipe material to rotate itself. The cutting mechanism 200 has a simple structure and is easily adapted to the pipe delivery mechanism 500. It should be understood that the feed cutting depth of the cutting blade 210 should be less than the wall thickness of the straight pipe material.

[0052] Specifically, the rotary driver 250 includes a motor and a synchronous belt. The motor drives the rotary seat 220 to rotate via the synchronous belt. The feed frame 230 is slidably connected to the rotary seat 220. The feed drive assembly 240 includes a spring and a cylinder. A transmission sleeve is slidably provided on the outer periphery of the rotary seat 220 in the front-back direction. The cylinder can drive the transmission sleeve to slide back and forth. The transmission sleeve abuts against the feed frame 230 through the inclined top surface, driving the feed frame 230 to move toward the straight tube material. The spring is provided between the rotary seat 220 and the feed frame 230 and can elastically push the feed frame 230 radially away from the straight tube material.

[0053] In the embodiments, reference is made to Figure 6 The feed frame 230 has three feed frames evenly arranged around the central axis of the tube through hole 221. One feed frame 230 is equipped with a cutting knife 210, and the other feed frames 230 are equipped with tube wall limiting wheels 260. The rotation axis of the tube wall limiting wheels 260 is parallel to the central axis of the tube through hole 221.

[0054] Three feed frames 230 are provided, one of which is equipped with a cutting blade 210, and the others are equipped with pipe wall limiting wheels 260. When the cutting blade 210 is fed, the pipe wall limiting wheels 260 simultaneously abut against the outer wall of the pipe material, so that the pipe material can be cut stably. When the cutting blade 210 moves radially away from the pipe material, the pipe wall limiting wheels 260 can also move away from the pipe material simultaneously, which facilitates the conveying of the pipe material.

[0055] It is conceivable that in other embodiments, the feed frame 230 may also be slidably connected to the rotary seat 220 via a guide post and guide sleeve structure, and the feed drive assembly 240 may be, for example, an electric cylinder, directly driving the feed frame 230 to move. The electric cylinder is mounted on the rotary seat 220 and is powered by an electric slip ring. The rotary drive 250 may also employ, for example, a motor coupled with a chain and sprocket structure, or an internal combustion engine.

[0056] In the embodiments, reference is made to Figure 2 The pipe feeding mechanism 500 includes a pipe feeding clamping assembly 510 and a pipe feeding driver 520. The pipe feeding clamping assembly 510 is slidably disposed on the machine base 100 in the front-back direction. The pipe feeding clamping assembly 510 can clamp or release the pipe material. The pipe feeding driver 520 is used to drive the pipe feeding clamping assembly 510 to move. By clamping the pipe material and reciprocating in the front-back direction, the pipe material is fed, the feeding size is easy to control, and the feeding is relatively stable.

[0057] Specifically, the pipe feeding clamping assembly 510 includes a lower pipe feeding clamp 511, an upper pipe feeding clamp 512, and a pipe feeding clamping driver 513. The upper pipe feeding clamp 512 is slidably disposed above the lower pipe feeding clamp 511 in the vertical direction. The pipe feeding clamping driver 513 can drive the upper pipe feeding clamp 512 to move up and down to clamp or release the straight pipe material. The pipe feeding driver 520 is a motor-driven lead screw structure. It is conceivable that in some other embodiments, the pipe feeding clamping assembly 510 may also be an electric gripper, etc.; the pipe feeding mechanism 500 may also convey the straight pipe material forward by contacting the outer surface of the straight pipe material with a plurality of friction wheels.

[0058] Specifically, the rear side of the pipe feeding mechanism 500 is also equipped with several straightening rollers for straightening the pipe material.

[0059] Reference Figure 1 This utility model also discloses a U-tube sleeve welding ring machine, which adopts the aforementioned U-tube bending device. The adoption of the aforementioned U-tube bending device simplifies the structure of the U-tube sleeve welding ring machine and improves its production efficiency.

[0060] Specifically, the small U-tubes produced by the U-tube bending device enter the collection hopper 110 after leaving the bending mechanism 300, and are then transported by the conveying device 600 to the U-tube welding ring device 700 for welding ring operation.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0062] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A U-tube forming device, characterized in that, include: Base (100); A cutting mechanism (200) is provided on the base (100), and the cutting mechanism (200) is provided with a cutting blade (210), which can make a circumferential cut relative to the outer periphery of the tube; A bending mechanism (300) is disposed on the base (100) and located in front of the cutting mechanism (200), the bending mechanism (300) being able to bend the tube into a U-shape; A break-off mechanism (400) is disposed on the base (100) and located between the cutting mechanism (200) and the bending mechanism (300). The break-off mechanism (400) can break the tube between the bending mechanism (300) and the break-off mechanism (400) at the cut. The tube feeding mechanism (500) is disposed on the base (100) and located behind the cutting mechanism (200). The tube feeding mechanism (500) can feed the tube forward and make the tube pass through the cutting mechanism (200), the breaking mechanism (400) and the bending mechanism (300) in sequence.

2. The U-tube forming device according to claim 1, characterized in that: The breakage mechanism (400) includes a breakage clamping assembly (410) and a breakage driver (420). The breakage clamping assembly (410) can clamp or release the tube material. The breakage clamping assembly (410) is movably disposed on the machine base (100) in the front-back direction. The breakage driver (420) is used to drive the breakage clamping assembly (410) to move back and forth.

3. The U-tube forming device according to claim 2, characterized in that: The pull-off clamping assembly (410) includes a lower pull-off clamp (411), an upper pull-off clamp (412), and a pull-off clamping driver (413). The lower pull-off clamp (411) is slidably disposed on the base (100) in the front-back direction. The pull-off driver (420) is connected to the lower pull-off clamp (411). The upper pull-off clamp (412) is vertically opposite to the lower pull-off clamp (411). The upper pull-off clamp (412) is slidably disposed on the lower pull-off clamp (411) in the up-down direction. The pull-off clamping driver (413) is disposed on the lower pull-off clamp (411) and is used to drive the upper pull-off clamp (412) to move.

4. The U-tube forming device according to claim 1, characterized in that: The bending mechanism (300) includes a core mold (310), a flipping mold (320), and a bending driver (330). The outer peripheral surface of the core mold (310) is provided with a U-shaped fitting surface (311). The flipping mold (320) is rotatably mounted on the machine base (100) and can rotate along the U-shaped fitting surface (311). A tube bending station is formed between the flipping mold (320) and the core mold (310). The bending driver (330) is used to drive the flipping mold (320) to rotate.

5. The U-tube forming device according to claim 4, characterized in that: The bending mechanism (300) includes a bending clamping seat (340) and a bending clamping driver (350). The bending clamping seat (340) is slidably disposed on the machine base (100) and can approach or move away from the mandrel (310). The bending clamping driver (350) is used to drive the bending clamping seat (340) to move. A tube clamping position is formed between the bending clamping seat (340) and the mandrel (310).

6. The U-tube forming apparatus according to claim 4, characterized in that: The bending mechanism (300) further includes a mandrel (360) and a mandrel driver (370). The mandrel (360) is slidably disposed on the flipping mold (320) so that the mandrel (360) can be inserted into or disengaged from the inner hole of the tube. The mandrel (360) rotates synchronously with the flipping mold (320).

7. The U-tube forming apparatus according to claim 1, characterized in that: The cutting mechanism (200) further includes a rotating base (220), a feed frame (230), a feed drive assembly (240), and a rotary driver (250). The rotating base (220) is provided with a tube through hole (221) in the front-back direction. The rotating base (220) is rotatably mounted on the machine base (100) about the central axis of the tube through hole (221). The rotary driver (250) is used to drive the rotating base (220) to rotate. The feed frame (230) is movably mounted on the rotating base (220) in the radial direction of the tube through hole (221). The cutting blade (210) is mounted on the feed frame (230). The feed drive assembly (240) is used to drive the feed frame (230) to move.

8. The U-tube forming apparatus according to claim 7, characterized in that: The feed frame (230) is provided with at least two and is evenly arranged around the central axis of the tube through hole (221). One of the feed frames (230) is provided with the cutting knife (210), and the other feed frames (230) are provided with tube wall limiting wheels (260). The rotation axis of the tube wall limiting wheel (260) is parallel to the central axis of the tube through hole (221).

9. The U-tube forming apparatus according to claim 1, characterized in that: The tube feeding mechanism (500) includes a tube feeding clamping assembly (510) and a tube feeding driver (520). The tube feeding clamping assembly (510) is slidably disposed on the base (100) in the front-back direction. The tube feeding clamping assembly (510) can clamp or release the tube material. The tube feeding driver (520) is used to drive the tube feeding clamping assembly (510) to move.

10. A U-tube sleeve welding ring machine, characterized in that, Includes the U-tube forming apparatus according to any one of claims 1 to 9.

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