Variable-caliber three-roller bending mechanism based on in-orbit manufacturing

Abstract

The invention discloses a variable-caliber three-roller bending mechanism based on in-orbit manufacturing, and relates to the technical field of space manufacturing, and the variable-caliber three-roller bending mechanism comprises a rack, a bending roller mechanism and a guide roller mechanism; multi-motor independent driving is replaced by coaxial worm and gear transmission, redundant components are reduced, the length of a transmission chain is shortened by 60%, the device adapts to narrow space deployment of a space capsule, + / -0.05 mm level positioning precision of the roller position is achieved through the worm-worm gear self-locking characteristic and ball thread pair transmission, and the service life of the device is prolonged. The isosceles triangle roller distribution and the axis inclination design allow the same equipment to complete straight pipe bending, spiral pipe rolling and special-shaped pipe forming, the light weight, precision, reliability and task adaptability of on-orbit manufacturing equipment are comprehensively improved, and an efficient and low-consumption core manufacturing tool is provided for tasks such as deep space exploration and space station extension. And the method has obvious engineering application value.

Description

Technical Field

[0001] The present invention relates to the technical field of space manufacturing technology, and in particular to a variable-caliber three-roller bending mechanism based on on-orbit manufacturing. Background Art

[0002] As a key support for space exploration, on-orbit manufacturing technology is gradually shifting from concept verification to practical application. By utilizing the space microgravity environment and in-situ resources, this technology can realize the on-orbit construction of large space structures, effectively breaking through the size limit of the launch vehicle fairing. As the basic unit of core structures such as space trusses and fuel tanks, the manufacturing accuracy and morphological adaptability of metal pipe fittings directly determine the performance indicators of space facilities. Traditional on-orbit pipe forming equipment mostly adopts a fixed roller group structure, which is limited by mechanical design principles and can only produce pipe fittings of a single specification. However, the demand for multifunctional composite structures in deep space exploration missions is growing, such as deployable solar panel support frames, adaptive morphological heat dissipation pipelines, etc., which require tubular components to have dynamic caliber adjustment capabilities.

[0003] In the existing ground industry, although variable diameter pipe winding technology has been realized, it generally relies on the coordinated control of multiple groups of independent drive units, resulting in a 35%-60% increase in system mass, which is in fundamental contradiction with the strict mass limit of spacecraft payload. In addition, the position adjustment of the roller group of traditional spiral pipe winding machines mostly adopts split hydraulic drive, which has problems such as easy failure of seals and high maintenance frequency, and it is difficult to adapt to long-term reliable operation in the extreme environment of space. However, the current on-orbit manufacturing equipment is limited by the bottleneck of lightweight and modular design, and still uses fixed-caliber forming solutions, resulting in limited mission flexibility and low resource utilization. For example, single-caliber pipe fittings require redundant configuration of equipment of different specifications, which significantly increases the launch cost; and when assembling complex structures, additional connecting parts are required due to insufficient adaptability of the pipe diameter, introducing structural vulnerabilities.

[0004] In response to the above problems, although some studies have attempted to achieve the diameter-changing function through an adjustable roller spacing mechanism, the existing solutions have two major defects: First, the adjustment mechanism mostly uses linear guides and independent motor drives, which leads to a complex transmission chain and a significant impact of the temperature difference in space on the positioning accuracy; second, the caliber change requires manual intervention or step-by-step locking, which cannot meet the needs of on-orbit automated manufacturing. Therefore, how to achieve precise stepless adjustment of the diameter of the pipe while ensuring the compactness of the mechanism has become a key technical bottleneck restricting the engineering application of space manufacturing technology. Summary of the invention

[0005] The present invention provides a variable-caliber three-roller bending mechanism based on on-track manufacturing, which achieves the technical effect of being able to form a larger-caliber spiral tube with a smaller displacement and to achieve stepless change of the tube diameter through screw transmission.

[0006] To achieve the above-mentioned purpose, the present invention provides a variable-caliber three-roller bending mechanism based on on-track manufacturing, comprising a frame, a bending roller mechanism and a guide roller mechanism;

[0007] The frame comprises a lower bottom plate, an upper top plate and support rods, wherein the lower bottom plate and the upper top plate are arranged in parallel, and the support rods are arranged at four corners between the lower bottom plate and the upper top plate;

[0008] The bending roller mechanism comprises a movable bending roller and a fixed bending roller, both of which are arranged on the top of the lower bottom plate, the movable bending roller is provided with two mutually parallel first bending rollers, the fixed bending roller comprises a bending frame, the bending frame is provided with a second bending roller, the second bending roller is parallel to the first bending roller, and the second bending roller and the first bending roller are distributed in an isosceles triangle;

[0009] The guide roller mechanism comprises a height adjustment mechanism, an adjustment frame and a guide roller assembly, wherein the height adjustment mechanism is fixedly mounted on the bottom of the upper top plate, the adjustment frame comprises a horizontally placed moving plate and side plates arranged perpendicular to the moving plate on the left and right sides, the moving plate is transmission-connected to the height adjustment mechanism, and the number of the guide roller assemblies is three, and the three guide roller assemblies are respectively arranged at the bottom of the moving plate and the inner sides of the two side plates;

[0010] The frame forms an angle of 3°-10° with the axes of the bending roller mechanism and the guide roller mechanism. The angle is adjusted by motor-driven gear transmission. The base is equipped with a ruler for calibration. After adjusting to the corresponding angle, the motor stops driving and is locked.

[0011] In some embodiments, the movable bending roller includes a first motor, a first worm and two vertically arranged first telescopic assemblies;

[0012] Both ends of the first worm are fixedly mounted on the lower base plate through bearing seats, the first motor is fixedly mounted on the lower base plate, the output end of the first motor is transmission-connected to one end of the first worm, the first telescopic assembly is fixedly mounted on the top of the first worm, the first telescopic assembly is transmission-connected to the first worm, the first bending roller is arranged at the output end of the first telescopic assembly, and the transmission is converted into the telescopic action of the first telescopic assembly in the vertical direction through the worm gear structure of the first worm and the first telescopic assembly, thereby driving the first bending roller to realize the lifting function.

[0013] In some embodiments, the bending frame is L-shaped, a slot is provided on a side of the bending frame, and a second bending roller is clamped in the slot.

[0014] In some embodiments, the height adjustment mechanism includes a fifth worm, a third motor, and two vertically disposed third telescopic assemblies;

[0015] Two ends of the fifth worm are fixedly mounted on the bottom of the upper top plate through bearing seats, the third motor is fixedly mounted on the bottom of the upper top plate, the output end of the third motor is connected with one end of the fifth worm, the third telescopic assembly is fixedly mounted on the bottom of the upper top plate, the third telescopic assembly is transmission-connected with the fifth worm, the top of the movable plate is fixedly connected with the output ends of the two third telescopic assemblies, a guide rod is fixedly mounted between the lower bottom plate and the upper top plate, the movable plate is movably mounted on the guide rod, and the transmission is converted into the telescopic action of the third telescopic assembly in the vertical direction through the worm gear structure of the fifth worm and the third telescopic assembly, thereby driving the movable plate to realize the lifting function.

[0016] In some embodiments, the adjustment frame further includes a second motor, a worm gear device, a second worm, a third worm, and a fourth worm;

[0017] The two ends of the third worm are fixedly mounted on the bottom of the moving plate through bearings, the second worm and the fourth worm are fixedly mounted on the sides of the two side plates respectively, the worm of the worm gear device is fixedly mounted on the output end of the second motor, the second motor is fixedly mounted on the side of one of the side plates, the worm wheel of the worm gear device is fixedly mounted on the second worm or the fourth worm, and one end of the second worm and one end of the third worm, and one end of the fourth worm and the other end of the third worm are all connected by bevel gear transmission structure;

[0018] The guide roller assembly includes a guide roller device and a second telescopic assembly, wherein the guide roller device is fixedly installed at the output end of the second telescopic assembly, and three of the second telescopic assemblies are respectively fixedly connected to two side plates and a movable plate, and the three of the second telescopic assemblies are respectively connected to the second worm, the third worm and the fourth worm for transmission.

[0019] In some embodiments, the guide roller device, the first bending roller and the second bending roller each comprise a roller unit, and the roller unit comprises:

[0020] A plurality of rollers are arranged at intervals along the axial direction thereof;

[0021] A driving gear corresponding to each roller one by one, wherein the driving gear is coaxially fixed to the end of the corresponding roller;

[0022] An idler wheel is arranged between adjacent driving gears, and the idler wheel is meshed with two adjacent driving gears at the same time to achieve transmission synchronization;

[0023] and mounting base plates for mounting drive gears, rollers, and idler gears.

[0024] In some embodiments, both left and right sides of the mounting base plate included in the second bending roller are provided with card slots that are card-engaged with the slots.

[0025] In some embodiments, the first bending roller and guide roller device further comprises a fixing plate, the fixing plate is fixedly mounted on a side of the mounting base plate, and the fixing plate is engaged with the mounting rail.

[0026] In some embodiments, the first telescopic assembly, the second telescopic assembly and the third telescopic assembly each include a telescopic unit, and the telescopic unit includes:

[0027] The rotating worm wheel can be used for meshing transmission with the second worm, the third worm, the fourth worm, the fifth worm and the first worm;

[0028] A main shaft, fixedly connected to the rotating worm gear through a keyway;

[0029] The threaded sleeve is threadedly connected to one end of the main shaft to convert the rotation of the main shaft into the linear motion of the threaded sleeve;

[0030] A mounting rail, used for mounting the guide roller device, fixedly mounted at one end of the threaded sleeve;

[0031] The sleeve is sleeved on the surface of the threaded sleeve, and a pin hole is opened on the surface. A pin shaft is installed in the pin hole. A fixing cover is provided at one end of the sleeve, and the fixing cover limits the elongation of the threaded sleeve. The sleeve and the connecting sleeve are fixed by tightening the pin shaft.

[0032] In some embodiments, the surface of the main shaft is rotatably connected to a connecting sleeve via a bearing, the surface of the connecting sleeve of the transversely placed telescopic unit is connected to a suspension rod, and the top end of the suspension rod is connected to the movable plate.

[0033] Compared with the related art, the variable-caliber three-roller bending mechanism based on on-orbit manufacturing provided by the present invention solves the core problems of quality, precision, adaptability and reliability of traditional on-orbit manufacturing equipment through structural optimization and technological innovation. Its beneficial effects are mainly reflected in the following aspects:

[0034] The present invention provides a variable-caliber three-roller bending mechanism based on on-orbit manufacturing, which adopts coaxial worm gear transmission to replace the independent drive of multiple motors, reduces redundant components, shortens the transmission chain length by 60%, and adapts to the deployment in the narrow space of the space capsule.

[0035] The present invention provides a variable-caliber three-roller bending mechanism based on on-track manufacturing, which achieves a roller position positioning accuracy of ±0.05mm through the self-locking characteristics of the worm-worm gear and the ball thread pair transmission, and supports continuous adjustment of the pipe diameter of Φ30-300mm.

[0036] The present invention provides a variable-caliber three-roller bending mechanism based on on-orbit manufacturing. Through a slot-type roller unit and an installation base plate interface, rollers with different surface textures (knurling / anti-stick coating) can be quickly replaced to meet the needs of multiple scenarios such as fuel pipes and heat dissipation pipes.

[0037] The invention provides a variable-caliber three-roller bending mechanism based on on-track manufacturing. The isosceles triangle roll distribution and axis tilt design allow the same equipment to complete straight tube bending, spiral tube winding and special-shaped tube forming.

[0038] This patent comprehensively improves the lightweight, precision, reliability and mission adaptability of on-orbit manufacturing equipment, provides efficient and low-consumption core manufacturing tools for tasks such as deep space exploration and space station expansion, and has significant engineering application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0040] Figure 2 It is a schematic diagram of the structure of the movable bending roller of the present invention;

[0041] Figure 3 It is a schematic diagram of the structure of the adjustment frame of the present invention;

[0042] Figure 4 It is a schematic diagram of the height adjustment mechanism structure of the present invention;

[0043] Figure 5 It is a schematic diagram of the telescopic unit structure of the present invention;

[0044] Figure 6 It is a schematic diagram of the cross-sectional structure of the telescopic unit of the present invention;

[0045] Figure 7 It is a schematic diagram of the roller unit structure of the present invention;

[0046] Figure 8 It is a schematic diagram of the installation structure of the roller unit and the bending frame of the present invention;

[0047] Fig. 9 It is a schematic diagram of the frame structure of the present invention.

[0048] Numbers in the figure: 1, frame; 2, movable bending roller; 3, fixed bending roller; 4, height adjustment mechanism; 5, adjustment frame; 6, guide roller assembly; 11, lower bottom plate; 12, upper top plate; 13, support rod; 14, guide rod; 21, first motor; 22, first worm; 23, first telescopic assembly; 24, first bending roller; 31, second bending roller; 32, slot; 51, movable plate; 52, side plate; 53, second motor; 54, worm gear Rod device; 55, second worm; 56, third worm; 57, fourth worm; 58, suspension rod; 61, guide roller device; 62, second telescopic assembly; 41, fifth worm; 42, third motor; 43, third telescopic assembly; 71, main shaft; 72, rotating worm gear; 73, sleeve; 74, mounting rail; 75, threaded sleeve; 76, connecting sleeve; 81, mounting base plate; 82, driving gear; 83, roller; 84, idler; 85, fixing plate. DETAILED DESCRIPTION

[0049] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0050] Example 1: Overall structure and basic workflow

[0051] like Figure 1-9 As shown, the variable-caliber three-roller bending mechanism of the present invention includes a frame 1, a bending roller mechanism and a guide roller mechanism. The frame 1 is composed of a lower base plate 11, an upper top plate 12 and four support rods 13, and the support rods 13 vertically connect the lower base plate 11 and the upper top plate 12 to form a stable frame structure. The bending roller mechanism includes symmetrically arranged movable bending rollers 2 and fixed bending rollers 3, wherein the two first bending rollers 24 of the movable bending roller 2 and the second bending roller 31 of the fixed bending roller 3 are distributed in an isosceles triangle to form a basic roller pressure zone for pipe forming. The guide roller mechanism drives the adjustment frame 5 to rise and fall through the height adjustment mechanism 4, and the three guide roller assemblies 6 are respectively located at the bottom of the movable plate 51 and the inner side of the two side plates 52, which are used for multi-directional constraints during the pipe forming process.

[0052] Key features:

[0053] Isosceles triangle roller distribution: three rollers form a symmetrical pressure field to ensure uniform force when the pipe is bent;

[0054] Axis tilt design: the frame and roller axis form an angle of 3°-10°, which reduces the feeding resistance of the pipe and adapts to the continuous feeding in the microgravity environment of space;

[0055] Modular rack: The support rod 13 is connected with quick-release angle brackets to facilitate on-track replacement or expansion of functional modules.

[0056] Embodiment 2: Dynamic adjustment of the bending roller mechanism

[0057] like Figure 2 As shown, the movable bending roller 2 is linked with the first telescopic assembly 23 through the first worm 22. The first motor 21 drives the first worm 22 to rotate, driving the worm gears in the two first telescopic assemblies 23 to rotate synchronously, thereby controlling the lifting and lowering of the two first bending rollers 24. A slot 32 is provided on the side of the L-shaped structure of the bending frame 3, and the second bending roller 31 is quickly plugged into the slot 32 through the card slot, so that rollers of different diameters can be replaced.

[0058] Adjustment process:

[0059] Caliber adjustment: the first motor 21 is started, and the worm gear drives the two first bending rollers 24 to rise or fall synchronously, changing the height of the apex of the isosceles triangle, thereby adjusting the bending curvature of the pipe;

[0060] Roller replacement: When processing extra-large diameter pipes, the second bending roller 31 can be pulled out and replaced with an extended roller module, and the spring locking mechanism in the slot 32 is automatically fixed;

[0061] Pressure compensation: The first telescopic component 23 has a built-in pressure sensor to provide real-time feedback of roller pressure and to prevent pipe crushing through worm fine-tuning.

[0062] Embodiment 3: Multi-dimensional coordinated control of guide roller mechanism

[0063] like Figure 5 As shown, the height adjustment mechanism 4 drives the two third telescopic components 43 to rise and fall synchronously through the fifth worm 41, driving the moving plate 51 to move up and down along the guide rod 14. A second worm 55, a third worm 56 and a fourth worm 57 are arranged inside the adjustment frame 5, and a three-axis linkage is realized through a bevel gear structure. The second motor 53 drives the worm gear device 54, driving the second worm 55 and the fourth worm 57 to rotate synchronously, and then drives the third worm 56 to rotate through the bevel gear set.

[0064] Collaborative control logic:

[0065] Vertical adjustment: The third motor 42 drives the fifth worm 41 to make the three guide roller assemblies 6 rise and fall synchronously to match different pipe heights;

[0066] Horizontal adjustment: the second motor 53 drives the worm group, driving the worm gears in the three second telescopic components 62 to rotate, thereby realizing the lateral telescopic movement of the guide roller device 61;

[0067] Adaptive clamping: The three guide roller assemblies 6 form a dynamic constraint triangle, which automatically adjusts the clamping gap according to the deformation of the pipe to prevent the pipe from twisting.

[0068] Embodiment 4: Synchronous drive mechanism of roller unit

[0069] like Figure 6 As shown, the roller unit of the guide roller device 61 includes a plurality of rollers 83, each roller 83 end is fixedly connected to a driving gear 82, and an idler gear 84 meshes with adjacent driving gears to achieve synchronous transmission. The mounting base 81 integrates all gear sets and is connected to the mounting rail of the second telescopic assembly 62.

[0070] Synchronicity safeguards:

[0071] Gear meshing accuracy: The driving gear 82 and the idler gear 84 adopt a helical gear design to eliminate transmission clearance and ensure that the linear speed of multiple rollers is consistent;

[0072] Modular replacement: The mounting base plate 81 can be disassembled as a whole, and the roller unit can be quickly replaced according to different pipe surface treatment requirements (such as anti-stick coating, knurling texture);

[0073] Torque balance: A magnetic powder clutch is provided at the shaft end of each roller 83, which automatically reduces the torque when a single point is stuck to avoid scratches on the pipe surface.

[0074] Embodiment 5: Precision transmission structure of telescopic unit

[0075] like Figure 7 As shown, the telescopic unit converts the rotational motion into the linear motion of the threaded sleeve 75 by rotating the worm wheel 72 and meshing with the worm. The main shaft 71 and the threaded sleeve 75 adopt a ball thread pair, and the transmission efficiency is more than 90%. The surface of the sleeve 73 is provided with multiple groups of pin holes, and the telescopic function is locked by adjusting the position of the pin shaft.

[0076] Self-locking function: The reverse self-locking feature of the worm gear drive ensures that no additional braking device is required after the adjustment is completed.

Claims

1. A variable-caliber three-roller bending mechanism based on on-track manufacturing, characterized in that: It includes a frame, a bending roller mechanism and a guide roller mechanism; The frame comprises a lower bottom plate, an upper top plate and support rods, wherein the lower bottom plate and the upper top plate are arranged in parallel, and the support rods are arranged at four corners between the lower bottom plate and the upper top plate; The bending roller mechanism comprises a movable bending roller and a fixed bending roller, both of which are arranged on the top of the lower bottom plate, the movable bending roller is provided with two mutually parallel first bending rollers, the fixed bending roller comprises a bending frame, the bending frame is provided with a second bending roller, the second bending roller is parallel to the first bending roller, and the second bending roller and the first bending roller are distributed in an isosceles triangle; The guide roller mechanism comprises a height adjustment mechanism, an adjustment frame and a guide roller assembly, wherein the height adjustment mechanism is fixedly mounted on the bottom of the upper top plate, the adjustment frame comprises a horizontally placed moving plate and side plates arranged perpendicular to the moving plate on the left and right sides, the moving plate is transmission-connected to the height adjustment mechanism, and the number of the guide roller assemblies is three, and the three guide roller assemblies are respectively arranged at the bottom of the moving plate and the inner sides of the two side plates; The frame forms an angle of 3°-10° with the axes of the bending roller mechanism and the guide roller mechanism. The angle is adjusted by motor-driven gear transmission. The base is equipped with a ruler for calibration. After adjusting to the corresponding angle, the motor stops driving and is locked.

2. The variable-caliber three-roller bending mechanism based on on-track manufacturing according to claim 1 is characterized in that: The movable bending roller comprises a first motor, a first worm and two vertically arranged first telescopic assemblies; Both ends of the first worm are fixedly mounted on the lower base plate through bearing seats, the first motor is fixedly mounted on the lower base plate, the output end of the first motor is transmission-connected to one end of the first worm, the first telescopic assembly is fixedly mounted on the top of the first worm, the first telescopic assembly is transmission-connected to the first worm, the first bending roller is arranged at the output end of the first telescopic assembly, and the transmission is converted into the telescopic action of the first telescopic assembly in the vertical direction through the worm gear structure of the first worm and the first telescopic assembly, thereby driving the first bending roller to realize the lifting function.

3. The variable-caliber three-roller bending mechanism based on on-track manufacturing according to claim 1 is characterized in that: The bending frame is L-shaped, and a slot is provided on the side of the bending frame, in which a second bending roller is clamped.

4. The variable-caliber three-roller bending mechanism based on on-track manufacturing according to claim 1 is characterized in that: The height adjustment mechanism comprises a fifth worm, a third motor and two vertically arranged third telescopic assemblies; Two ends of the fifth worm are fixedly mounted on the bottom of the upper top plate through bearing seats, the third motor is fixedly mounted on the bottom of the upper top plate, the output end of the third motor is connected with one end of the fifth worm, the third telescopic assembly is fixedly mounted on the bottom of the upper top plate, the third telescopic assembly is transmission-connected with the fifth worm, the top of the movable plate is fixedly connected with the output ends of the two third telescopic assemblies, a guide rod is fixedly mounted between the lower bottom plate and the upper top plate, the movable plate is movably mounted on the guide rod, and the transmission is converted into the telescopic action of the third telescopic assembly in the vertical direction through the worm gear structure of the fifth worm and the third telescopic assembly, thereby driving the movable plate to realize the lifting function.

5. The variable-caliber three-roller bending mechanism based on on-track manufacturing according to claim 1 is characterized in that: The adjustment frame also includes a second motor, a worm gear device, a second worm, a third worm and a fourth worm; The two ends of the third worm are fixedly mounted on the bottom of the moving plate through bearings, the second worm and the fourth worm are fixedly mounted on the sides of the two side plates respectively, the worm of the worm gear device is fixedly mounted on the output end of the second motor, the second motor is fixedly mounted on the side of one of the side plates, the worm wheel of the worm gear device is fixedly mounted on the second worm or the fourth worm, and one end of the second worm and one end of the third worm, and one end of the fourth worm and the other end of the third worm are all connected by bevel gear transmission structure; The guide roller assembly includes a guide roller device and a second telescopic assembly, wherein the guide roller device is fixedly installed at the output end of the second telescopic assembly, and three of the second telescopic assemblies are respectively fixedly connected to two side plates and a movable plate, and the three of the second telescopic assemblies are respectively connected to the second worm, the third worm and the fourth worm for transmission.

6. A variable-caliber three-roller bending mechanism based on on-track manufacturing according to any one of claims 1-5, characterized in that: The guide roller device, the first bending roller and the second bending roller each comprise a roller unit, and the roller unit comprises: A plurality of rollers are arranged at intervals along the axial direction thereof; A driving gear corresponding to each roller one by one, wherein the driving gear is coaxially fixed to the end of the corresponding roller; An idler wheel is arranged between adjacent driving gears, and the idler wheel is meshed with two adjacent driving gears at the same time to achieve transmission synchronization; and mounting base plates for mounting drive gears, rollers, and idler gears.

7. The variable-caliber three-roller bending mechanism based on on-track manufacturing according to claim 6 is characterized in that: The left and right sides of the installation base plate included in the second bending roller are both provided with card slots that are card-engaged with the slots.

8. The variable-caliber three-roller bending mechanism based on on-track manufacturing according to claim 6 is characterized in that: The first bending roller and guide roller device further comprises a fixing plate, the fixing plate is fixedly mounted on the side of the mounting base plate, and the fixing plate is mutually clamped with the mounting rail.

9. A variable-caliber three-roller bending mechanism based on on-track manufacturing according to any one of claims 1-5, characterized in that: The first telescopic assembly, the second telescopic assembly and the third telescopic assembly all include a telescopic unit, and the telescopic unit includes: The rotating worm wheel can be used for meshing transmission with the second worm, the third worm, the fourth worm, the fifth worm and the first worm; A main shaft, fixedly connected to the rotating worm gear through a keyway; The threaded sleeve is threadedly connected to one end of the main shaft to convert the rotation of the main shaft into the linear motion of the threaded sleeve; A mounting rail, used for mounting the guide roller device, fixedly mounted at one end of the threaded sleeve; The sleeve is sleeved on the surface of the threaded sleeve, and a pin hole is opened on the surface. A pin shaft is installed in the pin hole. A fixing cover is provided at one end of the sleeve, and the fixing cover limits the elongation of the threaded sleeve. The sleeve and the connecting sleeve are fixed by tightening the pin shaft.

10. The variable-caliber three-roller bending mechanism based on on-track manufacturing according to claim 9 is characterized in that: The surface of the main shaft is rotatably connected with a connecting sleeve through a bearing, and the surface of the connecting sleeve of the telescopic unit placed horizontally is connected with a suspension rod, and the top end of the suspension rod is connected to the moving plate.

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