A high-pressure heater heat exchange tube bending mechanism

Abstract

The present application relates to the technical field of tube bending, and specifically discloses a high-pressure heater heat exchange tube bending mechanism, which includes a machine body, a bending die, a clamping die, and a positioning die arranged on the machine body. A soft support bag is inserted into the tube, and the support bag is filled with magnetorheological fluid. The clamping die and the positioning die are both provided with a first electromagnet, and the first electromagnet located in the clamping die and the first electromagnet located in the positioning die are opposite in polarity to each other at one end near the tube. The bending die is made of a high magnetic resistance material, and the length of the support bag is greater than the distance between the two first electromagnets. The support bag is provided with a guide component for guiding the direction of the magnetic field, and the machine body is provided with an adjustment component for adjusting the position of the support bag. The present application provides an optimal and effective support effect for the inner wall of the tube by changing the hardness and softness of the support bag.

Description

Technical Field

[0001] The present application relates to the technical field of tube bending, and in particular to a high-pressure heater heat exchange tube bending mechanism. Background Art

[0002] High-pressure heaters utilize a portion of the steam turbine's exhaust to heat feedwater. They are primarily used in the regenerative heat systems of large thermal power units. Their heat transfer performance directly impacts the unit's economic efficiency and safety. Heat exchange tubes are used for heat exchange between two media, offering high thermal conductivity and good isothermal properties. Common materials for high-pressure heater heat exchange tubes include carbon-manganese steel and stainless steel.

[0003] The heat exchange tube bending mechanism often uses a tube bending machine to bend the tube. The processing flow of the device is as follows: the tube is placed on the machine body and connected to the transmission mechanism, and the tube is driven to move forward and rotate by the transmission mechanism. The tube is transported by the transmission mechanism to the positioning die and the bending die. When the tube is in the bending operation, the bending die in the bending die rotates and the clamping die revolves along the bending die. During this process, the tube moves forward, the positioning die and the bending die clamp the tube, and the positioning die also moves forward synchronously with the tube.

[0004] During the bending process, support is required for the inner wall of the bent portion of the tube to prevent uneven force from causing tube wall collapse, wrinkling, or cross-sectional deformation. Common tube inner wall support structures include mandrels, such as those in Chinese Patent Application No. 2024211777060, which supports the inner wall of the tube via a protective chuck. Other methods use high-pressure fluids to provide support for the inner wall of the tube, such as Patent Application No. 2025100120016, which injects liquid into the heat dissipation tube to provide flexible support inside the tube. This helps prevent wrinkles and cross-sectional deformation during the bending process. Furthermore, because the pressure of the liquid medium on the inner wall of the tube is uniform in all directions, it can ensure forming quality and reduce the occurrence of defects.

[0005] Regarding the above-mentioned related technologies, the inventors believe that the following defects exist: when the inner wall of the tube is supported by a core rod, the bending angle of the core rod is affected by the gap between the protective chucks on the core rod. When the gap between the protective chucks is too small, the bending angle range of the core rod is too small and it is difficult to adapt to various working conditions. When the gap between the protective chucks is too large, when bending the tube at a small angle, a large gap will appear between the protective chucks, making it impossible for the protective chucks to provide better support for the inner wall of the tube, and the tube is prone to wrinkles at the gap between the protective chucks; when the inner wall of the tube is supported by a high-pressure fluid, since the tube is in a preliminary processing state at this time, the tube mouth is relatively rough and it is difficult to connect seamlessly with the fluid nozzle. If the fluid pressure is small, it is difficult to provide effective support for the tube, and if the pressure is too high, it is easy to cause safety hazards. Summary of the Invention

[0006] In order to improve the problem that the bent portion of the tube is difficult to have effective support during the tube bending process, the present application provides a high-pressure heater heat exchange tube bending mechanism.

[0007] The present application provides a high-pressure heater heat exchange tube bending mechanism that adopts the following technical solutions:

[0008] A high-pressure heater heat exchange tube bending mechanism comprises a body, a bending die, a clamping die, and a positioning die disposed on the body, characterized in that: a flexible support bag is inserted into the tube, the support bag being filled with magnetorheological fluid; a first electromagnet is disposed in both the clamping die and the positioning die, and the first electromagnet in the clamping die and the first electromagnet in the positioning die are of opposite polarity at the end near the tube; the bending die is made of a high magnetic resistance material; and the length of the support bag is greater than the distance between the two first electromagnets.

[0009] The support bag is provided with a guiding component for guiding the direction of the magnetic field, and the machine body is provided with an adjusting component for adjusting the position of the support bag.

[0010] By adopting the above technical solution, after the pipe is placed on the machine body, the support bag is inserted from one end of the pipe, and the component is adjusted so that one end of the support bag is located opposite to the clamping die and the other end is located at the bending die. When the machine body starts to bend, the first electromagnet is energized, and the two first electromagnets are made to have opposite polarities close to one end of the pipe. Since the heat exchange tube of the high-pressure heater is made of carbon manganese steel or stainless steel, the magnetic permeability is much lower than that of the magnetorheological fluid. At this time, the magnetic field of the two first electromagnets penetrates the pipe into the support bag, and the two first electromagnets and the magnetorheological fluid form a closed magnetic circuit through the guiding component. In this process, the magnetorheological fluid is affected by the magnetic field and converted into high viscosity and low fluidity. The solid-like properties of the tube are dynamic. Since the movement direction of the tube during bending is not parallel to the direction of the magnetic field passing through the magnetorheological fluid, the particle chain structure in the magnetorheological fluid has a more significant obstruction effect on the flow, thereby enabling the support bag to support the inner wall of the tube without dead angles, and the support strength can be changed by changing the magnetic field strength generated by the first electromagnet, and the support effect is better; when the tube is bent and the positioning die moves back to reset, the first electromagnet is disconnected, and the magnetorheological fluid is restored to a low-viscosity, high-fluidity Newtonian fluid. At this time, the support bag can be bent arbitrarily, and the support bag is withdrawn from the bent part of the tube by adjusting the component to facilitate the support bag to move to the next bending part of the tube or be unloaded from the tube.

[0011] Optionally, the guiding assembly includes magnetic blocks fixedly connected to both ends of the support bag and a plurality of magnetic balls elastically arranged on the magnetic blocks located near one end of the clamping mold. The diameter of the magnetic block near one end of the clamping mold is smaller than the inner diameter of the pipe, and the magnetic block near one end of the positioning mold is in contact with the pipe, and the magnetic balls are always in contact with the pipe.

[0012] By adopting the above technical solution, the magnetic block has low magnetic resistance characteristics, so that the magnetic field generated by the first electromagnet is more guided by the magnetic block, thereby reducing leakage magnetic flux. When the tube is bent and the support bag needs to be separated from the bent part of the tube, the first electromagnet is turned off. At this time, the support bag becomes flexible again. The magnetic block at one end of the clamping die has a smaller diameter than the tube and is not easy to get stuck when exiting the bent part of the tube. The magnetic balls elastically connected to the magnetic block are always in contact with the inner wall of the tube, which makes it easy to reduce the air gap between the magnetic balls and the corresponding first electromagnet, thereby reducing the dissipation of magnetic flux lines.

[0013] Optionally, a plurality of connecting rods are provided in the support bag, each of the connecting rods is spherically hinged to each other at both ends, and the connecting rods at both ends are spherically hinged to the two magnetic conductive blocks respectively.

[0014] By adopting the above technical solution, the connecting rod is located in the magnetorheological fluid. When the magnetorheological fluid becomes solid-like due to the magnetic field, the connecting rod enhances the tensile strength of the support bag, thereby indirectly improving the support force of the support bag on the pipe.

[0015] Optionally, a partition is coaxially fixed to the connecting rod, and a connecting hole is provided on the partition.

[0016] By adopting the above technical solution, during the bending process of the tube, the magnetorheological fluid located in the inner circle of the bending part tends to move toward the outer circle and the two ends. The partition blocks part of the movement path of the magnetorheological fluid, thereby improving the bending resistance of the support bag.

[0017] Optionally, the partition is made of a material with high magnetic permeability, and the connecting rod is made of a material with low magnetic permeability.

[0018] By adopting the above technical solution, after the magnetic flux lines enter the magnetorheological fluid, the high magnetic permeability partitions arranged at intervals reduce the dissipation of the magnetic flux lines, thereby reducing the support performance loss in the middle part of the support bag and reducing energy waste. The connecting rod is made of a material with low magnetic permeability, which reduces the amount of magnetic flux lines passing through the connecting rod, thereby reducing the interference of the connecting rod on the magnetic field of the magnetorheological fluid.

[0019] Optionally, the adjustment component includes an adjustment block arranged at the end of the support bag at the positioning mold and a second electromagnet arranged on the positioning mold, the adjustment block is made of a material with high magnetic permeability, and the second electromagnet is located at the end of the first electromagnet away from the clamping mold.

[0020] By adopting the above technical solution, when the support bag needs to be positioned, the second electromagnet is turned on, so that the adjustment block and the second electromagnet are attracted to each other to keep the position of the support bag unchanged. When the tube is bent and the positioning mold is reset, the second electromagnet also moves synchronously. At this time, the support bag is also attracted by the second electromagnet and moves synchronously.

[0021] Optionally, a magnetic isolation block is fixedly connected between the adjustment block and the magnetic conductive block.

[0022] By adopting the above technical solution, when the position of the support bag is adjusted, the magnetic field of the second electromagnet is difficult to enter the magnetorheological fluid due to the blocking effect of the magnetic isolation block, thereby reducing the influence of the second electromagnet on the hardness change of the support bag.

[0023] Optionally, the second electromagnet is elastically arranged on the positioning die, and the second electromagnet is always tightly pressed against the pipe.

[0024] By adopting the above technical solution, when a bending process is completed, the positioning die needs to be moved away from the pipe first to reduce the friction between the pipe and the positioning die. The second electromagnet is always in contact with the pipe due to its elasticity, so that the friction force exerted by the positioning die on the pipe during the resetting process is small and does not affect the magnetic force of the second electromagnet on the adjustment block.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. When the tube is bent, the first electromagnet is energized, and the magnetic field of the two first electromagnets penetrates the tube into the support bag. The two first electromagnets and the magnetorheological fluid form a closed magnetic circuit through the guide assembly. During this process, the magnetorheological fluid is affected by the magnetic field and transforms into a solid-like property with high viscosity and low fluidity. Since the movement direction of the tube during bending is not parallel to the direction of the magnetic field passing through the magnetorheological fluid, the particle chain structure in the magnetorheological fluid has a more significant effect on the flow, thereby enabling the support bag to support the inner wall of the tube without dead angles. The support strength can be changed by changing the magnetic field strength generated by the first electromagnet, resulting in an excellent support effect. When the tube is bent and the positioning die is moved back to reset, the first electromagnet is disconnected. At this time, the magnetorheological fluid returns to a Newtonian fluid with low viscosity and high fluidity, making it easier for the support bag to move to the next bending point of the tube or be unloaded from the tube.

[0027] 2. Due to its low magnetic resistance, the magnetic conductive block guides more of the magnetic field generated by the first electromagnet, thereby reducing magnetic leakage. At the same time, after the magnetic flux lines enter the magnetorheological fluid, the high magnetic permeability partitions arranged at intervals reduce the dissipation of the magnetic flux lines, thereby reducing the support performance loss in the middle part of the support bag and energy waste. The low magnetic permeability material of the connecting rod reduces the amount of magnetic flux lines passing through the connecting rod, thereby reducing the interference of the connecting rod on the magnetic field of the magnetorheological fluid.

[0028] 3. When the support bag needs to be positioned, the second electromagnet is turned on, causing the adjustment block to attract the second electromagnet to maintain the relative position of the support bag and the second electromagnet unchanged. When the tube is bent, the second electromagnet moves synchronously with the reset of the positioning die, thereby driving the support bag to move without being affected by the movement of the tube. This structure of the support bag is relatively simple and can adapt to longer tubes.

[0029] 4. The connecting rod is located in the magnetorheological fluid, causing the magnetorheological fluid to become solid-like due to the magnetic field. During the bending process of the tube, the inner ring of the magnetorheological fluid is squeezed and the outer ring is stretched. The connecting rod enhances the tensile strength of the support bag, thereby indirectly improving the support force of the support bag on the tube. In this process, the magnetorheological fluid located in the inner ring of the bending part will also tend to move toward the outer ring and the two ends. The partition blocks part of the movement path of the magnetorheological fluid, thereby improving the bending resistance of the support bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0031] Figure 2 It is along Figure 1 Schematic diagram of the partial cross-section structure along line AA;

[0032] Figure 3 yes Figure 2 Schematic diagram of the enlarged portion B.

[0033] Figure numerals: 1. Body; 11. Bending mold; 12. Clamping mold; 13. Positioning mold; 2. Support bag; 3. First electromagnet; 4. Guide assembly; 41. Magnetic block; 42. Magnetic ball; 5. Adjustment assembly; 51. Adjustment block; 52. Second electromagnet; 61. Connecting rod; 62. Partition; 63. Connecting hole; 7. Friction plate; 8. Pipe; 9. Magnetic isolation block. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-3 This application is described in further detail.

[0035] The embodiment of the present application discloses a high-pressure heater heat exchange tube bending mechanism. Figure 1 、 Figure 2 and Figure 3 The high-pressure heater heat exchange tube bending mechanism includes a body 1, a bending die 11, a clamping die 12 and a positioning die 13 arranged on the body 1, a soft support bag 2 is inserted into the tube 8, and the support bag 2 is filled with magnetorheological fluid. The clamping die 12 and the positioning die 13 are both provided with a first electromagnet 3, and the first electromagnet 3 is fixedly connected to a friction plate 7 that abuts against the tube 8. The friction plate 7 is made of a high magnetic permeability material. The friction plate 7 can be a high magnetic permeability and high strength material such as ferrite, nickel-iron-cobalt alloy, etc. In this application, the friction plate 7 is a nickel-iron-cobalt alloy. The first electromagnet 3 located in the clamping die 12 and the first electromagnet 3 located in the positioning die 13 are opposite in polarity to each other at one end near the tube 8. The bending die 11 is made of austenitic stainless steel to reduce the influence on the magnetic flux lines passing through the magnetorheological fluid. The length of the support bag 2 is greater than the distance between the two first electromagnets 3; a guide component 4 for guiding the direction of the magnetic field is provided on the support bag 2, and an adjustment component 5 for adjusting the position of the support bag 2 is provided on the body 1.

[0036] After the pipe 8 is placed on the body 1, the support bag 2 is inserted from one end of the pipe 8. By adjusting the component 5, one end of the support bag 2 is located opposite the clamping die 12 and the other end is located at the bending die 11. When the body 1 starts the bending operation, the first electromagnet 3 is energized, and the two first electromagnets 3 are opposite to each other near one end of the pipe 8. Since the heat exchange tube of the high-pressure heater is made of carbon manganese steel or stainless steel, the magnetic permeability is much lower than that of the magnetorheological fluid. At this time, the magnetic field of the two first electromagnets 3 penetrates the pipe 8 into the support bag 2, and the two first electromagnets 3 and the magnetorheological fluid form a closed magnetic circuit through the guide component 4. In this process, the magnetorheological fluid is affected by the magnetic field and converted into a high-viscosity, low-fluidity class. Solid properties, and because the movement direction of the tube 8 during the bending process is not parallel to the direction of the magnetic field passing through the magnetorheological fluid, the particle chain structure in the magnetorheological fluid has a more significant hindering effect on the flow, thereby enabling the support bag 2 to support the inner wall of the tube 8 without dead angles, and the support strength can be changed by changing the magnetic field strength generated by the first electromagnet 3, and the support effect is better; when the tube 8 is bent and the positioning mold 13 moves back to reset, the first electromagnet 3 is disconnected, and the magnetorheological fluid is restored to a low-viscosity, high-fluidity Newtonian fluid. At this time, the support bag 2 can be bent arbitrarily, and the support bag 2 is withdrawn from the bending part of the tube 8 by adjusting the component 5, so that the support bag 2 can be moved to the next bending part of the tube 8 or unloaded from the tube 8.

[0037] Among them, the support bag 2 is divided into an impermeable and pressure-resistant layer and a fiber reinforcement layer from the inside to the outside. The impermeable and pressure-resistant layer is made of long-chain nylon PA12 or PVC-C material to provide the core functions of impermeability and pressure resistance. The fiber reinforcement layer can be embedded with aramid / glass fiber woven mesh to further enhance the strength of the support bag 2.

[0038] Reference Figure 3The guide assembly 4 includes a magnetic block 41 fixed to both ends of the support bag 2 and a plurality of magnetic balls 42 elastically arranged on the magnetic block 41 located near the end of the clamping mold 12. The magnetic balls 42 are connected to the magnetic block 41 through a spring. The diameter of the magnetic block 41 near the end of the clamping mold 12 is smaller than the inner diameter of the tube 8, and the magnetic block 41 near the end of the positioning mold 13 is in contact with the tube 8. The magnetic balls 42 are always in contact with the tube 8. The magnetic block 41 and the magnetic balls 42 are also made of nickel-iron-cobalt alloy.

[0039] Due to its low magnetic resistance characteristics, the magnetic block 41 guides more of the magnetic field generated by the first electromagnet 3, thereby reducing leakage magnetic flux. When the tube 8 is bent and the support bag 2 needs to be separated from the bent portion of the tube 8, the first electromagnet 3 is turned off. At this time, the support bag 2 returns to flexibility. The magnetic block 41 at one end of the clamping die 12 has a smaller diameter than the tube 8 and is not easy to get stuck when exiting the bent portion of the tube 8. The magnetic ball 42 elastically connected to the magnetic block 41 is always in contact with the inner wall of the tube 8, which makes it easier to reduce the air gap between the magnetic ball 42 and the corresponding first electromagnet 3, thereby reducing the dissipation of magnetic flux lines.

[0040] Reference Figure 3 A plurality of connecting rods 61 are provided in the support bag 2. Each connecting rod 61 is ball-hinged with each other at both ends. The connecting rods 61 at both ends are respectively ball-hinged with the two magnetic blocks 41. A partition 62 is coaxially fixed to the connecting rod 61. A connecting hole 63 is provided on the partition 62. The partition 62 is made of nickel-iron-cobalt alloy, and the connecting rod 61 is made of austenitic stainless steel or other non-magnetic materials.

[0041] Connecting rod 61 is located within the magnetorheological fluid, causing it to become solid-like due to the magnetic field. During the bending process of tube 8, the inner ring of the magnetorheological fluid is squeezed and the outer ring is stretched. Connecting rod 61 strengthens the tensile strength of support bag 2, thereby indirectly increasing the support force of support bag 2 on tube 8. During this process, the magnetorheological fluid located in the inner ring of the bend also tends to move toward the outer ring and the ends. Baffle 62 blocks part of the magnetorheological fluid's movement path, thereby improving the bending resistance of support bag 2. After magnetic flux lines enter the magnetorheological fluid, the high-permeability baffles 62 placed at intervals reduce the dissipation of magnetic flux lines, thereby reducing the loss of support performance in the middle portion of support bag 2 and energy waste. The low-permeability material of connecting rod 61 reduces the amount of magnetic flux lines passing through connecting rod 61, thereby reducing the interference of connecting rod 61 with the magnetic field of the magnetorheological fluid.

[0042] Reference Figure 1 and Figure 2The magnetic conductive block 41 located at one end of the support bag 2 close to the positioning mold 13 is fixedly connected to the magnetic isolation block 9. The adjustment component 5 includes an adjustment block 51 fixedly connected to the end of the magnetic isolation block 9 and a second electromagnet 52 elastically arranged at the end of the positioning mold 13. The adjustment block 51 is made of nickel-iron-cobalt alloy. The second electromagnet 52 is connected to the positioning mold 13 through an elastic telescopic rod, and the second electromagnet 52 is always tightly pressed against the pipe 8. The end of the second electromagnet 52 close to the pipe 8 is also fixedly connected to the friction plate 7. The second electromagnet 52 is located at the end of the first electromagnet 3 away from the clamping mold 12.

[0043] When it is necessary to position the support bag 2, the second electromagnet 52 is turned on, so that the adjustment block 51 and the second electromagnet 52 are attracted to each other to keep the position of the support bag 2 unchanged. When the tube 8 is bent, the positioning mold 13 needs to be moved away from the tube 8 first to reduce the friction between the tube 8 and the positioning mold 13. The second electromagnet 52 is always in contact with the tube 8 due to its elasticity, so that the friction force exerted by the positioning mold 13 on the tube 8 during the resetting process is small and does not affect the magnetic force of the second electromagnet 52 on the adjustment block 51, that is, the second electromagnet 52 also moves synchronously therewith. At this time, the support bag 2 is also attracted by the second electromagnet 52 and moves synchronously. In this process, the magnetic field of the second electromagnet 52 is difficult to enter the magnetorheological fluid due to the blocking effect of the magnetic isolation block 9, thereby reducing the influence of the second electromagnet 52 on the hardness change of the support bag 2, so as to increase the magnetic field strength of the second electromagnet 52.

[0044] In other feasible embodiments, the guide assembly 4 can also be a joint fixed to the end of the magnetic block 41 and connected to the transmission mechanism of the body 1, driving the movement of the support bag 2 through the transmission mechanism, but this method has higher requirements on the length of the tube 8 and can be selected according to actual working conditions.

[0045] The implementation principle of the high-pressure heater heat exchange tube bending mechanism of the embodiment of the present application is as follows: after the tube 8 is placed on the body 1, the bending die 11 and the positioning die 13 clamp the tube 8, and the clamping die 12 and the bending die 11 also clamp the tube 8. Then, the support bag 2 is inserted from one end of the tube 8, and the second electromagnet 52 is turned on, so that the adjustment block 51 and the second electromagnet 52 are attracted to each other to position and fix the support bag 2;

[0046] When the machine body 1 starts the bending operation, the bending die 11 rotates, the clamping die 12 revolves around the bending die 11, and the positioning die 13 moves forward. At the same time, the first electromagnet 3 is energized, and the two first electromagnets 3 are opposite to each other near one end of the tube 8. At this time, the magnetic fields of the two first electromagnets 3 pass through the tube 8 into the support bag 2, and form a closed magnetic circuit with the two first electromagnets 3 and the magnetorheological fluid through the magnetic conductive block 41. In this process, the magnetorheological fluid is affected by the magnetic field and transformed into a solid-like property with high viscosity and low fluidity. Since the movement direction of the tube 8 during the bending process is not parallel to the direction of the magnetic field passing through the magnetorheological fluid, the particle chain structure in the magnetorheological fluid has a more significant hindering effect on the flow, thereby enabling the support bag 2 to support the inner wall of the tube 8 without dead angles, and the support strength can be changed by changing the magnetic field strength generated by the first electromagnet 3, so the support effect is better.

[0047] When the tube 8 is bent and the positioning die 13 moves back to reset, the first electromagnet 3 is disconnected. At this time, the magnetorheological fluid returns to a low-viscosity, high-fluidity Newtonian fluid. At this time, the support bag 2 can be bent arbitrarily. The second electromagnet 52 is energized, and the second electromagnet 52 moves synchronously with the backward movement of the positioning die 13, thereby driving the adjustment block 51 to move synchronously, that is, the support bag 2 moves synchronously, so that the support bag 2 withdraws from the bending part of the tube 8, so that the support bag 2 can move to the next bending part of the tube 8 or be unloaded from the tube 8.

[0048] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A high-pressure heater heat exchange tube bending mechanism, comprising a body (1), a bending die (11) arranged on the body (1), a clamping die (12) and a positioning die (13), characterized in that: A soft support bag (2) is inserted into the tube (8), and the support bag (2) is filled with magnetorheological fluid. The clamping die (12) and the positioning die (13) are both provided with a first electromagnet (3), and the first electromagnet (3) located in the clamping die (12) and the first electromagnet (3) located in the positioning die (13) are opposite in polarity at one end close to the tube (8). The bending die (11) is made of a high magnetic resistance material, and the length of the support bag (2) is greater than the distance between the two first electromagnets (3); The guide assembly (4) includes a magnetic block (41) fixed to both ends of the support bag (2) and a plurality of magnetic balls (42) elastically arranged on the magnetic block (41) located near one end of the clamping die (12), the diameter of the magnetic block (41) near one end of the clamping die (12) is smaller than the inner diameter of the tube (8), and the magnetic block (41) near one end of the positioning die (13) is in contact with the tube (8), the magnetic balls (42) are always in contact with the tube (8), and the movement direction of the tube (8) during the bending process is not parallel to the direction of the magnetic field passing through the magnetorheological fluid; The support bag (2) is provided with a guide component (4) for guiding the direction of the magnetic field, and the body (1) is provided with an adjustment component (5) for adjusting the position of the support bag (2); A plurality of connecting rods (61) are provided in the support bag (2), and each of the connecting rods (61) is spherically hinged to each other at both ends. The connecting rods (61) at both ends are spherically hinged to the two magnetic conductive blocks (41) respectively. A partition (62) is coaxially fixed to the connecting rod (61), and a connecting hole (63) is provided on the partition (62). The partition (62) is made of a high magnetic permeability material, and the connecting rod (61) is made of a low magnetic permeability material.

2. A high-pressure heater heat exchange tube bending mechanism according to claim 1, characterized in that: The adjustment assembly (5) comprises an adjustment block (51) arranged at the end of the support bag (2) located at the positioning mold (13) and a second electromagnet (52) arranged on the positioning mold (13), wherein the adjustment block (51) is made of a material with high magnetic permeability, and the second electromagnet (52) is located at an end of the first electromagnet (3) away from the clamping mold (12).

3. A high-pressure heater heat exchange tube bending mechanism according to claim 2, characterized in that: A magnetic isolation block (9) is fixedly connected between the adjustment block (51) and the magnetic conductive block (41).

4. A high-pressure heater heat exchange tube bending mechanism according to claim 2, characterized in that: The second electromagnet (52) is elastically arranged on the positioning die (13), and the second electromagnet (52) is always tightly pressed against the pipe (8).

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