Bending device and method for serpentine tube for high pressure heater

Abstract

The application relates to the technical field of bending machines, in particular to a serpentine pipe bending device and method for a high-pressure heater, which comprises a workbench, a clamping mechanism, a core rod mechanism and a bending mechanism. The clamping mechanism is arranged on the workbench and used for clamping the serpentine pipe. The core rod mechanism comprises a moving part, a ball head, a bending section, a turning ball and a wrapping layer. One end of the bending section is connected with the turning ball. The other end of the bending section is provided with a rolling groove. The bending section is provided with a plurality of bending sections and forms a chain structure. The adjacent two groups of bending sections are connected by being arranged in the rolling groove through the turning ball. The wrapping layer is wrapped outside the bending section. The outermost bending section is connected with the ball head. The bending mechanism is connected with the workbench and used for bending the serpentine pipe. The core rod mechanism is used for supporting the bending point of the serpentine pipe, reducing the wrinkles at the bending position, relieving the section ovalization phenomenon, reducing the difficulty of core pulling, and preventing the serpentine pipe inner wall from being scratched.

Description

Technical Field

[0001] This invention relates to the field of bending machine technology, and specifically to a serpentine tube bending device and method for a high-pressure heater. Background Technology

[0002] In high-pressure heaters, tube bundles are typically groups of many "U"-shaped tube bundles installed inside the heater housing; serpentine tubes are pipes coiled into a serpentine or spiral shape, and the bending process of serpentine tubes is one of the core processes in their manufacturing, the quality of which directly affects the lifespan and reliability of the tube bundle.

[0003] Chinese Patent Publication No. CN119076714A discloses a serpentine tube bending device and method, including a bending fixing sleeve, a first positioning bending sleeve, a second positioning bending sleeve, and a positioning connecting sleeve. The device achieves multi-point bending positioning of the serpentine tube through the bending fixing sleeve, the first positioning bending sleeve, the second positioning bending sleeve, and the positioning connecting sleeve, thus facilitating the bending of the serpentine tube, improving the bending effect, facilitating positioning during the bending process, and enhancing stability during bending.

[0004] However, the above-mentioned existing technology has the following defects: when the serpentine tube is bent, no mandrel is set inside. During the bending process, the material inside the serpentine tube is subjected to compressive stress. When the support is insufficient, it will become unstable and wrinkle. The root of the wrinkle is an extremely high stress concentration point, which is very easy to induce fatigue cracks under alternating loads. In addition, during the bending process, under the action of radial force, the circular cross-section is flattened and becomes elliptical, resulting in cross-sectional distortion. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the background art by proposing a serpentine tube bending device and method for high-pressure heaters.

[0006] The technical solution of the present invention: a serpentine tube bending device for a high-pressure heater, comprising a workbench, and further comprising: A clamping mechanism, located on the workbench, is used to clamp the serpentine tube. The mandrel mechanism includes a moving part, a ball head, a bend joint, a steering ball, and a wrapping layer; one end of the bend joint is connected to the steering ball; the other end of the bend joint has a rolling groove; multiple bend joints are provided to form a chain structure; adjacent sets of bend joints are connected by the steering ball rolling inside the rolling groove; the wrapping layer wraps around the outside of the bend joint; the outermost bend joint is connected to the ball head. A bending mechanism includes a steering table, a housing, a drive unit, a main shaft, a base, a bending head, a guide roller, a telescopic component b, a U-shaped component, and permanent magnets. The housing is connected to the worktable; the main shaft passes through the housing and is rotatably connected to it; the guide roller is connected to the top of the main shaft; the base is rotatably connected to the bottom of the main shaft; the steering table is connected to the main shaft; the telescopic component b is located on the steering table and is connected to the bending head; the U-shaped component is connected to the bending head; two permanent magnets are provided and are respectively connected to the two ends of the U-shaped component; a storage slot is provided at one end of the worktable; the drive unit is located in the storage slot and is drively connected to the main shaft.

[0007] Preferably, the clamping mechanism includes a telescopic component c, a telescopic component d, a clamping block a, a clamping block b, a plate a, a guide rod, a slide rail a, and a slide rail b; plate a is disposed on the worktable, and a hole is formed in plate a; slide rail a is connected to the guide rod; the guide rod is slidably connected to the hole; telescopic component c is disposed on the worktable and is connected to slide rail a; clamping block a is slidably connected to slide rail a; clamping block b is disposed on the worktable; slide rail b is disposed on the worktable; telescopic component d is slidably connected to slide rail b and is also connected to clamping block a.

[0008] Preferably, the moving part includes an L-shaped toothed plate, a support rod, a motor, and a U-shaped block; the L-shaped toothed plate is slidably connected to the worktable; the U-shaped block is slidably connected to the L-shaped toothed plate and has a support hole thereon; one end of the support rod is connected to the L-shaped toothed plate; the other end of the support rod passes through the support hole and is connected to a bending joint; the support rod has a scale value; the motor is located on the worktable and is connected to the L-shaped toothed plate for transmission.

[0009] Preferably, the output end of the motor is connected to gear a; gear a meshes with an L-shaped toothed plate.

[0010] Preferably, the outer casing has an opening; the drive unit includes a telescopic component a, a drive gear plate and a gear b; the telescopic component a is disposed inside the storage groove; the drive gear plate is slidably disposed inside the storage groove and connected to the telescopic component a; the gear b is connected to the main shaft.

[0011] Preferably, the wrapping layer is made of magnetorheological elastomer; the U-shaped part is made of soft magnetic material.

[0012] The present invention also proposes a method for bending a serpentine tube for a high-pressure heater, which uses the above-mentioned serpentine tube bending device for a high-pressure heater and includes the following steps: S1. Install the serpentine tube: Place the serpentine tube between clamping block a and clamping block b; activate the telescopic component c; the telescopic component c pushes the slide rail a to move, and the slide rail a drives the clamping block a to move closer to the clamping block b to achieve the clamping and installation of the serpentine tube, while ensuring that the bending point of the serpentine tube is located inside the guide roller. S2. Adjust the position of the mandrel mechanism: Based on the distance between the bend point of the serpentine tube and the opening of the serpentine tube, use the motor to drive the L-shaped toothed plate to move, thereby driving the mandrel mechanism to move inside the serpentine tube. The insertion depth can be controlled by the scale value on the support rod to ensure that the mandrel mechanism is quickly inserted into the bend point. S3. Perform bending operation: Control the telescopic component b to drive the bending head close to the guide roller, and cooperate with the guide roller to clamp the bending point of the serpentine tube. At the same time, the permanent magnet and the U-shaped part apply a uniform magnetic field to the coating layer, making the coating layer harden instantly. Then, the telescopic component a is opened. The telescopic component a drives the drive tooth plate to move. The drive tooth plate drives the gear b to rotate. The gear b drives the main shaft to rotate. The main shaft drives the steering table to rotate. The steering table drives the bending head to rotate, realizing the bending function of the serpentine tube. During the bending process, the mandrel mechanism conforms to the inner wall surface of the tube, providing uniform support force and reducing wrinkles at the bending point of the serpentine tube and the phenomenon of elliptic cross-section. S4. Core Extraction: After completing the bending operation of the serpentine tube, the bending head can be moved away from the guide roller using the telescopic component b. At this time, the permanent magnet and the U-shaped component no longer apply a magnetic field to the coating layer, and the coating layer will soften quickly. The chain structure composed of the bending joints can bend freely, making the mandrel mechanism very easy to extract. Then, the L-shaped toothed plate is driven away from the serpentine tube by the motor, and the mandrel structure is directly extracted from the bending point of the serpentine tube, which significantly reduces the difficulty of core extraction. In addition, during the core extraction process, the softening of the coating layer prevents scratches on the inner wall of the serpentine tube.

[0013] Compared with the prior art, the above-mentioned technical solution of the present invention has the following beneficial technical effects: By incorporating a mandrel mechanism, during the bending process of the serpentine tube, the mandrel mechanism conforms to the inner wall profile of the tube, providing uniform support force, reducing wrinkles at the bends of the serpentine tube, and significantly alleviating the phenomenon of cross-sectional ellipticization. After the bending operation is completed, the applied magnetic field is removed, and the coating layer on the surface of the mandrel softens instantly. Combined with the chain structure formed by the bending joints, the mandrel mechanism can bend and deform flexibly, making it extremely easy to extract the mandrel. Compared with traditional rigid mandrels, this greatly reduces the difficulty of mandrel extraction. Furthermore, during the mandrel extraction process, the softening of the coating layer prevents scratches on the inner wall of the serpentine tube. Attached Figure Description

[0014] Figure 1 A three-dimensional representation of an embodiment of the present invention Figure 1 ; Figure 2 A three-dimensional representation of an embodiment of the present invention Figure 2 ; Figure 3 In one embodiment of the present invention, the serpentine tube after bending is three-dimensional. Figure 1 ; Figure 4This is a perspective view of the workbench in cross-sectional state in one embodiment of the present invention; Figure 5 In one embodiment of the present invention, the serpentine tube after bending is three-dimensional. Figure 2 ; Figure 6 This is a schematic diagram of the connection structure between the moving part and the mandrel mechanism in one embodiment of the present invention; Figure 7 This is a schematic diagram of the mandrel mechanism in the cross-sectional state of the wrapping layer in one embodiment of the present invention.

[0015] Reference numerals: 1. Workbench; 2. Turning platform; 3. Housing; 4. Gear b; 5. Base; 6. Telescopic component b; 7. U-shaped component; 8. Permanent magnet; 9. Guide roller; 10. Clamping block b; 11. Clamping block a; 12. Slide rail a; 13. Telescopic component c; 14. Guide rod; 15. Plate a; 16. Telescopic component d; 17. Slide rail b; 18. L-shaped toothed plate; 19. Support rod; 20. U-shaped block; 21. Wrapping layer; 22. Drive toothed plate; 23. Telescopic component a; 24. Ball head; 25. Bending head; 26. Steering ball; 27. Bending joint; 2701. Rolling groove; 28. Motor. Detailed Implementation

[0016] Example 1, as Figures 1-7 As shown, the present invention proposes a serpentine tube bending device for a high-pressure heater, which includes a worktable 1, a clamping mechanism, a mandrel mechanism and a bending mechanism. The clamping mechanism is located on the workbench 1 and is used to clamp the serpentine tube; The mandrel mechanism includes a moving part, a ball head 24, a bending joint 27, a steering ball 26, and a wrapping layer 21. One end of the bending joint 27 is connected to the steering ball 26. The other end of the bending joint 27 has a rolling groove 2701. Multiple bending joints 27 are provided to form a chain structure (the bending joint 27 is made of a magnetically conductive material). Adjacent sets of bending joints 27 are connected by the steering ball 26 rolling inside the rolling groove 2701, ensuring that the chain structure can bend freely and easily follow the tube to bend at various angles, improving the flexibility of use and facilitating removal from the inside of the tube. The wrapping layer 21 wraps around the outside of the bending joint 27 (the wrapping layer 21, together with the overall structure of the bending joint 27, can withstand the compressive force when the tube is bent). The wrapping layer 21 is made of a magnetorheological elastomer, which is a smart material consisting of micron-scale soft magnetic particles (such as carbonyl iron powder) uniformly dispersed in an elastomer matrix (such as silicone rubber, natural rubber). The material is made by curing and molding in a rubber matrix. In the absence of a magnetic field, the soft magnetic particle chain is in its natural state, and the elastomer matrix dominates the mechanical properties of the material, making the material relatively soft. When a magnetic field is present, the particles are strongly magnetized again, and a strong magnetic dipole interaction force (attraction force) is generated between adjacent particles. This force attempts to resist any force that causes deformation of the chain structure, which macroscopically manifests as a significant increase in the stiffness (modulus) of the material. At the same time, the obstruction of the chain structure movement also leads to a change in damping performance (shear modulus can exceed 20 MPa). The outermost bend 27 is connected to the ball head 24, which is made of rubber material. The ball head 24 can guide the insertion of the mandrel mechanism and push dust or impurities (metal fragments may enter the tube when the serpentine tube is cut) away from the bending point, avoiding dust or impurities from increasing the friction and wear between the mandrel mechanism and the inner wall of the tube, and avoiding scratches on the mandrel mechanism and the inner wall of the tube.

[0017] The bending mechanism includes a steering table 2, a housing 3, a drive unit, a main shaft, a base 5, a bending head 25, a guide roller 9, a telescopic component b6, a U-shaped component 7, and permanent magnets 8. The housing 3 is connected to the worktable 1. The main shaft passes through the housing 3 and is rotatably connected to it. The guide roller 9 is connected to the top of the main shaft. The base 5 is rotatably connected to the bottom of the main shaft. The steering table 2 is connected to the main shaft. The telescopic component b6 is located on the steering table 2 and connected to the bending head 25 (both the bending head 25 and the guide roller 9 are made of high-permeability magnetic material). The U-shaped component 7 is connected to the bending head 25. Two permanent magnets 8 are provided and connected to both ends of the U-shaped component 7 (the permanent magnets 8 include, but are not limited to, neodymium iron boron permanent magnets, and the permanent magnets 8 at both ends are arranged with opposite poles facing each other). The U-shaped component 7 is made of soft magnetic material (soft magnetic material includes, but is not limited to, electrical pure iron). Iron and other soft magnetic materials have very strong magnetic permeability, providing a preferred path for magnetic field lines. When the poles of two permanent magnets 8 are connected by a U-shaped soft magnetic material, a closed path with low magnetic resistance is constructed. Most of the magnetic flux generated by the permanent magnets 8 is guided through the soft magnetic shell 3, forming a concentrated and efficient magnetic circuit. The resulting magnetic field is highly concentrated and uniform, mainly concentrated at the opening of the U-shape. A storage slot is provided at one end of the worktable 1. The drive unit is located in the storage slot and is connected to the main shaft for transmission. An opening is provided on the shell 3. The drive unit includes a telescopic component a23, a drive gear plate 22, and a gear b4. The telescopic component a23 is located inside the storage slot. The drive gear plate 22 is slidably disposed inside the storage slot and connected to the telescopic component a23. The gear b4 is connected to the main shaft.

[0018] It is worth noting that the serpentine tube targeted in this patent is made of magnetically conductive materials such as carbon steel, ensuring that the entire magnetic circuit forms a loop.

[0019] It should be noted that, according to Ohm's law for magnetic circuits, magnetic flux will preferentially pass through the path with lower magnetic reluctance (soft magnetic materials). When the magnetic flux reaches the air gap, because the magnetic reluctance of air is much higher than that of soft magnetic materials, the magnetic flux will be "squeezed" to cross from one pole shoe to another. If the air gap is very small and the pole shoe surfaces are parallel, the magnetic field lines in this region will become very dense, parallel and uniform, thus generating extremely strong magnetic induction intensity. This is the "working area" of the entire system, where the magnetic field energy is mainly concentrated (at the "U"-shaped opening).

[0020] In this embodiment, the clamping mechanism initially clamps the serpentine tube while ensuring that the bending point of the serpentine tube is located inside the guide roller 9. Then, the moving part drives the mandrel mechanism to move inside the serpentine tube, so that the mandrel mechanism is located at the bending point of the serpentine tube. During the process of the mandrel mechanism moving to the bending point, the ball head 24 can push the dust and impurities inside the serpentine tube away from the bending point, avoiding dust or impurities from increasing the friction and wear between the mandrel mechanism and the inner wall of the tube, and avoiding scratching the mandrel mechanism and the inner wall of the tube. Then, the telescopic component b6 is opened to drive the bending head 25 close to the guide roller 9 to achieve clamping of the bending point of the serpentine tube. At the same time, the permanent magnet 8 and the U-shaped part 7 apply a uniform magnetic field to the coating layer 21, making the coating layer 21 harden instantly. Then, the telescopic component a23 drives the drive tooth plate 22 to move, the drive tooth plate 22 drives the gear b4 to rotate, the gear b4 drives the main shaft to rotate, the main shaft drives the steering table 2 to rotate, and the steering table 2 drives the bending head 25 to... The main shaft axis makes a circular motion, thereby realizing the bending function of the serpentine tube. During the bending process, the chain structure formed by the wrapping layer 21 and the bending joint 27 bends accordingly. Since the wrapping layer 21 conforms to the inner wall profile of the tube, it provides uniform support force, reducing wrinkles at the bend of the serpentine tube and the phenomenon of elliptic cross-section. After the bending operation is completed, the bending head 25 is moved away from the guide roller 9 by the telescopic component b6. At this time, the permanent magnet 8 and the U-shaped part 7 no longer apply a magnetic field to the wrapping layer 21, and the wrapping layer 21 will soften quickly. The chain structure formed by the bending joint 27 can be bent freely, making the mandrel mechanism very easy to pull out. Then, the mandrel mechanism is pulled out from the bend of the serpentine tube by the moving part, which greatly reduces the difficulty of mandrel pulling. During the mandrel pulling process, the softening of the wrapping layer 21 prevents scratches on the inner wall of the serpentine tube. Then, by moving the serpentine tube, the next bending point of the serpentine tube is moved to the bending head 25, and the above bending operation is repeated.

[0021] It should be noted that when the serpentine tube is placed between clamping block a11 and clamping block b10, the mandrel mechanism and support rod 19 are already inserted into the serpentine tube, providing some support for the serpentine tube.

[0022] Example 2, as Figures 1-2As shown, this invention proposes a serpentine tube bending device for a high-pressure heater. Compared to Embodiment 1, this embodiment further details the structure of the clamping mechanism. The clamping mechanism includes a telescopic component c13, a telescopic component d16, a clamping block a11, a clamping block b10, a plate a15, a guide rod 14, a slide rail a12, and a slide rail b17. The plate a15 is mounted on the worktable 1 and has a hole. The slide rail a12 is connected to the guide rod 14. The guide rod 14 is slidably connected to the hole (the plate a15, in conjunction with the guide rod 14, can limit and guide the movement of the slide rail a12). The telescopic component c13 is mounted on the worktable 1 and connected to the slide rail a12. The clamping block a11 is slidably connected to the slide rail a12. The clamping block b10 is mounted on the worktable 1. The slide rail b17 is mounted on the worktable 1. The telescopic component d16 is slidably connected to the slide rail b17 and also connected to the clamping block a11.

[0023] In this embodiment, the telescopic component c13 pushes the slide rail a12 to move, and the slide rail a12 drives the clamping block a11 to move closer to the clamping block b10 to achieve the clamping and installation of the serpentine tube (the clamping block a11 and the clamping block b10 are provided with arc-shaped grooves adapted to the serpentine tube). During this process, the telescopic component d16 moves with the clamping block a11 under the action of the slide rail b17. During the bending process of the serpentine tube, in order to ensure that the clamping block a11 effectively blocks the unbent part of the serpentine tube, the telescopic component d16 will push the clamping block a11 to move, so that the clamping block a11 moves to the guide roller 9 to block the bending part of the tube bundle.

[0024] Example 3, as Figure 6 As shown, this invention proposes a serpentine tube bending device for a high-pressure heater. Compared to Embodiment 2, this embodiment further details the structure of the moving part, which includes an L-shaped toothed plate 18, a support rod 19, a motor 28, and a U-shaped block 20. The L-shaped toothed plate 18 is slidably connected to the worktable 1. The U-shaped block 20 is slidably connected to the L-shaped toothed plate 18 and has a support hole (the U-shaped block 20 and the L-shaped toothed plate 18 are slidably connected, allowing adjustment of its support point on the support rod 19). One end of the support rod 19 is connected to the L-shaped toothed plate 18. The other end of the support rod 19 passes through the support hole and is connected to a bending joint 27 (the U-shaped block 20 can support the support rod 19, ensuring the stability of the support rod 19 in supporting the mandrel mechanism). The support rod 19 has a scale value (the zero scale value is near the mandrel mechanism). The motor 28 is mounted on the worktable 1 and is connected to the L-shaped toothed plate 18 for transmission. The output end of the motor 28 is connected to a gear a. The gear a meshes with the L-shaped toothed plate 18.

[0025] In this embodiment, the motor 28 drives the gear a to rotate, the rotation of the gear a drives the L-shaped toothed plate 18 to move, the L-shaped toothed plate 18 drives the support rod 19 to move, and the support rod 19 drives the mandrel mechanism to move, thereby pushing the mandrel mechanism to the bending point of the serpentine tube. Under the action of the scale on the support rod 19, the mandrel mechanism can be accurately delivered to the bending point of the serpentine tube. For example, when the opening of the serpentine tube points to the scale 10 on the support rod 19, and the bending point of the serpentine tube is 12 meters away from the opening, the mandrel mechanism needs to be pushed 2 meters to move the mandrel mechanism to the bending point.

[0026] Example 4, please refer to Figures 1-7 The present invention also proposes a method for bending a serpentine tube for a high-pressure heater, using the serpentine tube bending device for a high-pressure heater described in any one of Embodiments 1 to 3, comprising the following steps: S1. Install the serpentine tube: Place the serpentine tube between clamping block a11 and clamping block b10; open the telescopic component c13; the telescopic component c13 pushes the slide rail a12 to move, and the slide rail a12 drives the clamping block a11 to move closer to the clamping block b10 to achieve the clamping and installation of the serpentine tube, while ensuring that the bending point of the serpentine tube is located inside the guide roller 9. S2. Adjust the position of the mandrel mechanism: Based on the distance between the bend point of the serpentine tube and the opening of the serpentine tube, the L-shaped toothed plate 18 is moved by the motor 28, which in turn drives the mandrel mechanism to move inside the serpentine tube. The insertion depth can be controlled by the scale value on the support rod 19 to ensure that the mandrel mechanism is quickly inserted into the bend point. S3. Perform bending operation: Control the telescopic component b6 to drive the bending head 25 close to the guide roller 9, and cooperate with the guide roller 9 to clamp the bending point of the serpentine tube. At the same time, the permanent magnet 8 and the U-shaped part 7 apply a uniform magnetic field to the wrapping layer 21, making the wrapping layer 21 harden instantly. Then, the telescopic component a23 is opened, and the telescopic component a23 drives the drive tooth plate 22 to move. The drive tooth plate 22 drives the gear b4 to rotate, the gear b4 drives the main shaft to rotate, the main shaft drives the steering table 2 to rotate, and the steering table 2 drives the bending head 25 to rotate, realizing the bending function of the serpentine tube. During the bending process, the mandrel mechanism conforms to the inner wall surface of the tube, providing uniform support force and reducing the wrinkles at the bending point of the serpentine tube and the phenomenon of cross-sectional ellipticization. S4. Core Extraction: After completing the bending operation of the serpentine tube, the bending head 25 can be moved away from the guide roller 9 by the telescopic component b6. At this time, the permanent magnet 8 and the U-shaped component 7 no longer apply a magnetic field to the wrapping layer 21, and the wrapping layer 21 will soften quickly. The chain structure composed of the bending joint 27 can be bent freely, making the mandrel mechanism very easy to extract. At this time, the L-shaped toothed plate 18 is driven away from the serpentine tube by the motor 28, and the mandrel structure is directly extracted from the bending point of the serpentine tube, which significantly reduces the difficulty of core extraction. In addition, during the core extraction process, the softening of the wrapping layer 21 prevents scratches on the inner wall of the serpentine tube.

[0027] It is worth noting that the serpentine tube generally has multiple serpentine bends, and the length of the mandrel mechanism, as well as the lengths of the worktable 1, the L-shaped toothed plate 18, and the support rod 19, can be specifically designed according to the required length of the serpentine tube.

[0028] In summary, the serpentine tube is placed between clamping blocks a11 and b10. The telescopic component c13 pushes the slide rail a12 to move, which in turn moves clamping block a11 closer to clamping block b10, thus clamping and installing the serpentine tube. Simultaneously, the bending point of the serpentine tube is located inside the guide roller 9. Then, the motor 28 drives gear a to rotate, which in turn drives the L-shaped toothed plate 18 to move. The L-shaped toothed plate 18 then moves the support rod 19, which in turn moves the mandrel mechanism inside the serpentine tube. Under the action of the scale on 9, the mandrel mechanism can be accurately delivered to the bending point of the serpentine tube. Then, the telescopic component b6 is activated, which drives the bending head 25 to approach the guide roller 9 to clamp the bending point of the serpentine tube. At the same time, the permanent magnet 8, in conjunction with the U-shaped component 7, applies a uniform magnetic field to the coating layer 21, causing the coating layer 21 to harden instantly. Then, the telescopic component a23 drives the drive gear plate 22 to move, the drive gear plate 22 pushes the gear b4 to rotate, the gear b4 drives the main shaft to rotate, the main shaft drives the steering table 2 to rotate, and the steering table 2... The bending head 25 moves in a circular motion around the main shaft axis, thereby achieving the bending function of the serpentine tube. During the bending process, the chain structure formed by the wrapping layer 21 and the bending joint 27 bends accordingly. Since the wrapping layer 21 conforms to the inner wall shape of the tube, it provides uniform support force, reduces wrinkles at the bend of the serpentine tube, and significantly alleviates the phenomenon of elliptic cross-section. After the bending operation is completed, the telescopic component b6 is used to move the bending head 25 away from the guide roller 9. At this time, the permanent magnet 8, together with the U-shaped part 7, moves away and no longer provides support to the wrapping layer. When a magnetic field is applied to layer 21, the wrapping layer 21 softens rapidly, and the chain structure composed of bending joints 27 can bend freely, making the mandrel mechanism very easy to extract. Then, the mandrel mechanism is extracted from the bend of the serpentine tube by the moving part. Compared with the traditional rigid mandrel, the difficulty of core extraction is greatly reduced. In addition, during the core extraction process, the softening of the wrapping layer 21 prevents scratches on the inner wall of the serpentine tube. Then, by moving the serpentine tube, the next bending point of the serpentine tube is moved to the bending head 25, and the above bending operation is repeated.

[0029] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A serpentine tube bending device for a high-pressure heater, comprising a workbench (1), characterized in that, Also includes: A clamping mechanism is provided on the workbench (1) for clamping the serpentine tube; The mandrel mechanism includes a moving part, a ball head (24), a bending joint (27), a steering ball (26), and a wrapping layer (21); one end of the bending joint (27) is connected to the steering ball (26); the other end of the bending joint (27) is provided with a rolling groove (2701); multiple bending joints (27) are provided and form a chain structure; adjacent sets of bending joints (27) are connected by the steering ball (26) rolling inside the rolling groove (2701); the wrapping layer (21) wraps around the outside of the bending joint (27); the outermost bending joint (27) is connected to the ball head (24); The bending mechanism includes a steering table (2), a housing (3), a drive unit, a main shaft, a base (5), a bending head (25), a guide roller (9), a telescopic component b (6), a U-shaped component (7), and a permanent magnet (8); the housing (3) is connected to the worktable (1); the main shaft passes through the housing (3) and is rotatably connected to the housing (3); the guide roller (9) is connected to the top of the main shaft; the base (5) is rotatably connected to the bottom of the main shaft; the steering table (2) is connected to the main shaft; the telescopic component b (6) is provided on the steering table (2) and is connected to the bending head (25); the U-shaped component (7) is connected to the bending head (25); two permanent magnets (8) are provided and are respectively connected to the two ends of the U-shaped component (7); a storage groove is provided at one end of the worktable (1); the drive unit is provided in the storage groove and is connected to the main shaft for transmission.

2. The serpentine tube bending device for a high-pressure heater according to claim 1, characterized in that, The clamping mechanism includes telescopic component c (13), telescopic component d (16), clamping block a (11), clamping block b (10), plate a (15), guide rod (14), slide rail a (12) and slide rail b (17); plate a (15) is set on the workbench (1), and a hole is opened on plate a (15); slide rail a (12) is connected to guide rod (14); guide rod (14) is slidably connected to hole; telescopic component c (13) is set on the workbench (1) and connected to slide rail a (12); clamping block a (11) is slidably connected to slide rail a (12); clamping block b (10) is set on the workbench (1); slide rail b (17) is set on the workbench (1); telescopic component d (16) is slidably connected to slide rail b (17) and connected to clamping block a (11).

3. The serpentine tube bending device for a high-pressure heater according to claim 1, characterized in that, The moving part includes an L-shaped toothed plate (18), a support rod (19), a motor (28), and a U-shaped block (20); the L-shaped toothed plate (18) is slidably connected to the worktable (1); the U-shaped block (20) is slidably connected to the L-shaped toothed plate (18) and has a support hole; one end of the support rod (19) is connected to the L-shaped toothed plate (18); the other end of the support rod (19) passes through the support hole and is connected to the bending joint (27); the support rod (19) has a scale value; the motor (28) is located on the worktable (1) and is connected to the L-shaped toothed plate (18) for transmission.

4. The serpentine tube bending device for a high-pressure heater according to claim 3, characterized in that, The output end of the motor (28) is connected to gear a; gear a meshes with L-shaped toothed plate (18).

5. A serpentine tube bending device for a high-pressure heater according to claim 1, characterized in that, An opening is provided on the outer casing (3); the drive unit includes a telescopic component a (23), a drive gear plate (22) and a gear b (4); the telescopic component a (23) is located inside the storage slot; the drive gear plate (22) is slidably located inside the storage slot and connected to the telescopic component a (23); the gear b (4) is connected to the main shaft.

6. The serpentine tube bending device for a high-pressure heater according to claim 1, characterized in that, The wrapping layer (21) is made of magnetorheological elastomer; the U-shaped part (7) is made of soft magnetic material.

7. A method for bending a serpentine tube for a high-pressure heater, comprising the serpentine tube bending device for a high-pressure heater as described in any one of claims 2-6, characterized in that, Includes the following steps: S1. Install the serpentine tube: Place the serpentine tube between clamping block a (11) and clamping block b (10); open the telescopic component c (13); the telescopic component c (13) pushes the slide rail a (12) to move, and the slide rail a (12) drives the clamping block a (11) to move closer to the clamping block b (10) to realize the clamping and installation of the serpentine tube, while ensuring that the bending point of the serpentine tube is located inside the guide roller (9); S2. Adjust the position of the mandrel mechanism: Based on the distance between the bend point of the serpentine tube and the opening of the serpentine tube, use the motor (28) to drive the L-shaped toothed plate (18) to move, thereby driving the mandrel mechanism to move inside the serpentine tube. The insertion depth can be controlled by the scale value on the support rod (19) to ensure that the mandrel mechanism is quickly inserted into the bend point. S3. Perform bending operation: Control the telescopic component b (6) to drive the bending head (25) close to the guide roller (9), and cooperate with the guide roller (9) to achieve the clamping of the bending point of the serpentine tube. At the same time, the permanent magnet (8) and the U-shaped part (7) apply a uniform magnetic field to the wrapping layer (21), so that the wrapping layer (21) hardens instantly. Then, open the telescopic component a (23), and the telescopic component a (23) drives the drive tooth plate (22) to move. The drive tooth plate (22) drives the gear b (4) to rotate, the gear b (4) drives the main shaft to rotate, the main shaft drives the steering table (2) to rotate, and the steering table (2) drives the bending head (25) to rotate, so as to realize the bending function of the serpentine tube. During the bending process, the mandrel mechanism conforms to the inner wall surface of the tube, provides uniform support force, and reduces the wrinkles at the bending point of the serpentine tube and the phenomenon of elliptic cross section. S4, Core pulling: After completing the bending operation of the serpentine tube, the bending head (25) can be moved away from the guide roller (9) by the telescopic component b (6). At this time, the permanent magnet (8) and the U-shaped part (7) no longer apply a magnetic field to the wrapping layer (21). The wrapping layer (21) will soften quickly, and the chain structure composed of the bending section (27) can be bent freely, making the core rod mechanism very easy to pull out. At this time, the L-shaped toothed plate (18) is driven away from the serpentine tube by the motor (28), and the core rod structure is directly pulled out from the bending point of the serpentine tube, which significantly reduces the difficulty of core pulling. In addition, during the core pulling process, the wrapping layer (21) softens, thus preventing scratches on the inner wall of the serpentine tube.

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