A variable-caliber three-roller bending mechanism based on on-track manufacturing

Abstract

This invention discloses a variable-diameter three-roll bending mechanism based on on-orbit manufacturing, relating to the field of space manufacturing technology. It includes a frame, a bending roller mechanism, and a guide roller mechanism. This invention replaces independent multi-motor drives with coaxial worm gear transmission, reducing redundant components and shortening the transmission chain length by 60%, adapting to deployment in the confined space of a spacecraft. Through the self-locking characteristics of the worm gear-worm wheel and the ball screw drive, it achieves a roller position positioning accuracy of ±0.05mm. The isosceles triangular roller distribution and axial tilt design allow the same equipment to complete straight pipe bending, spiral pipe winding, and irregular pipe forming. This comprehensively improves the lightweight, precision, reliability, and mission adaptability of on-orbit manufacturing equipment, providing an efficient and low-consumption core manufacturing tool for deep space exploration, space station expansion, and other missions, demonstrating significant engineering application value.

Description

Technical Field

[0001] This invention relates to the field of space manufacturing technology, and in particular to a variable-diameter three-roll bending mechanism based on on-orbit manufacturing. Background Technology

[0002] In-orbit manufacturing technology, a key support for space exploration, is gradually transitioning from proof-of-concept to practical application. This technology, utilizing the microgravity environment and in-situ resources of space, enables the in-orbit construction of large space structures, effectively overcoming the size limitations of launch vehicle fairings. Metal tubing, as the fundamental unit of core structures such as space trusses and fuel tanks, directly determines the performance indicators of space facilities through its manufacturing precision and morphological adaptability. Traditional in-orbit tubing forming equipment mostly employs fixed roller groups, which, limited by mechanical design principles, can only produce tubing of a single specification. However, the increasing demand for multifunctional composite structures in deep space exploration missions, such as deployable solar panel support frames and adaptive morphological cooling pipes, requires tubular components with dynamic diameter adjustment capabilities.

[0003] While variable-diameter pipe winding technology has been implemented in existing ground-based industries, it generally relies on the coordinated control of multiple independent drive units, resulting in a 35%-60% increase in system mass. This fundamentally contradicts the stringent mass constraints of spacecraft payloads. Furthermore, traditional spiral pipe winding machines often employ separate hydraulic drives for roller group position adjustment, leading to issues such as easy seal failure and high maintenance frequency, making them unsuitable for long-term reliable operation in the extreme environment of space. Current on-orbit manufacturing equipment, constrained by lightweight and modular design limitations, still uses fixed-diameter forming schemes, resulting in limited mission flexibility and low resource utilization. For example, single-diameter pipe fittings require redundant configuration of equipment of different specifications, significantly increasing launch costs; and during the assembly of complex structures, insufficient pipe diameter adaptability necessitates additional connecting components, introducing structural vulnerabilities.

[0004] To address the aforementioned issues, while some research has attempted to achieve diameter adjustment using adjustable roller gap mechanisms, existing solutions suffer from two major drawbacks: first, the adjustment mechanisms often employ linear guides and independent motor drives, resulting in complex transmission chains and positioning accuracy significantly affected by temperature differences in space; second, diameter changes require manual intervention or step-by-step locking, failing to meet the demands of on-orbit automated manufacturing. Therefore, achieving precise, stepless adjustment of pipe diameters while maintaining a compact mechanism has become a key technological bottleneck restricting the engineering application of space manufacturing technology. Summary of the Invention

[0005] This invention provides a variable-diameter three-roll bending mechanism based on on-orbit manufacturing, which achieves the technical effect of forming a large-diameter spiral tube with a small displacement and realizing stepless change of the tube diameter through screw drive.

[0006] To achieve the above objectives, the present invention provides a variable-diameter three-roll bending mechanism based on on-orbit manufacturing, comprising a frame, a bending roller mechanism, and a guide roller mechanism.

[0007] The frame includes a lower base plate, an upper top plate, and support rods. The lower base plate and the upper top plate are arranged in parallel, and the support rods are arranged at the four corners between the lower base plate and the upper top plate.

[0008] The bending roller mechanism includes a movable bending roller and a fixed bending roller. Both the movable and fixed bending rollers are located on the top of the lower base plate. The movable bending roller has two parallel first bending rollers. The fixed bending roller includes a bending frame, and the bending frame has 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 includes a height adjustment mechanism, an adjustment frame, and guide roller assemblies. The height adjustment mechanism is fixedly installed at the bottom of the top plate. The adjustment frame includes a horizontally placed movable plate and side plates with vertical movable plates on the left and right sides. The movable plate is connected to the height adjustment mechanism. There are three guide roller assemblies, which are respectively located at the bottom of the movable plate and on the inner side 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 a motor-driven gear transmission. The base is equipped with a ruler for calibration. After the corresponding angle is adjusted, the motor stops driving and locks.

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

[0012] Both ends of the first worm are fixedly mounted on the lower base plate via bearing seats. The first motor is fixedly mounted on the lower base plate, and the output end of the first motor is drivenly connected to one end of the first worm. The first telescopic assembly is fixedly mounted on the top of the first worm and is drivenly connected to the first worm. The first bending roller is located at the output end of the first telescopic assembly. The transmission between the first worm and the worm wheel structure of the first telescopic assembly is converted into the telescopic movement of the first telescopic assembly in the vertical direction, thereby driving the first bending roller to achieve the lifting function.

[0013] In some embodiments, 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 engaged.

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

[0015] The two ends of the fifth worm gear are fixedly installed at the bottom of the upper top plate via bearing seats. The third motor is fixedly installed at the bottom of the upper top plate, and the output end of the third motor is connected to one end of the fifth worm gear. The third telescopic assembly is fixedly installed at the bottom of the upper top plate and is connected to the fifth worm gear via a transmission connection. The top of the moving plate is fixedly connected to the output ends of the two third telescopic assemblies. A guide rod is fixedly installed between the lower bottom plate and the upper top plate. The moving plate is movably installed on the guide rod. The transmission between the fifth worm gear and the worm wheel structure of the third telescopic assembly is converted into the telescopic movement of the third telescopic assembly in the vertical direction, thereby driving the moving plate to achieve the lifting and lowering function.

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

[0017] The third worm is fixedly mounted on the bottom of the moving plate at both ends by bearings. The second and fourth worms are respectively fixedly mounted on the sides of the two side plates. 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 or fourth worm. 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 connected by a bevel gear structure.

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

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

[0020] Multiple rollers are arranged at intervals along their axial direction;

[0021] Each roller has a corresponding drive gear, which is coaxially fixed to the end of the corresponding roller.

[0022] An idler gear is provided between adjacent drive gears, and the idler gear meshes with the two adjacent drive gears simultaneously to achieve transmission synchronization;

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

[0024] In some embodiments, the mounting base plate included in the second bending roller is provided with slots on both the left and right sides that engage with the slot.

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

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

[0027] A rotating worm gear can be used for meshing and transmission with a second worm, a third worm, a fourth worm, a fifth worm, and a first worm.

[0028] The spindle is fixedly connected to the rotating worm gear via a keyway;

[0029] The threaded sleeve is threaded to one end of the spindle, converting the rotation of the spindle into linear motion of the threaded sleeve.

[0030] Mounting rail, used to mount guide roller device, is fixedly mounted on one end of threaded sleeve;

[0031] A sleeve is fitted onto the surface of a threaded sleeve. A pin hole is provided on the surface, and a pin is installed in the pin hole. A fixing cap is provided at one end of the sleeve, which restricts the elongation of the threaded sleeve. The sleeve is fixed to the connecting sleeve by tightening the pin.

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

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

[0034] This invention provides a variable-diameter three-roll bending mechanism based on on-orbit manufacturing. It adopts a coaxial worm gear transmission instead of multiple independent motor drives, reduces redundant parts, shortens the transmission chain length by 60%, and is suitable for deployment in the confined space of a spacecraft.

[0035] This invention provides a variable-diameter three-roll bending mechanism based on on-orbit manufacturing. Through the self-locking characteristics of the worm gear and worm wheel and the transmission of the ball screw pair, it achieves a positioning accuracy of ±0.05mm for the roller position and supports continuous adjustment of pipe diameter from Φ30 to 300mm.

[0036] This invention provides a variable-diameter three-roll bending mechanism based on on-orbit manufacturing. Through slotted roller units and mounting base interfaces, rollers with different surface textures (knurling / anti-stick coating) can be quickly replaced to adapt to the needs of various scenarios such as fuel pipes and heat dissipation pipes.

[0037] This invention provides a variable-diameter three-roll bending mechanism based on on-orbit manufacturing. The isosceles triangular roll distribution and axial tilt design allow the same equipment to complete straight tube bending, spiral tube winding, and irregular tube forming.

[0038] This patent comprehensively improves the lightweight, precision, reliability, and mission adaptability of on-orbit manufacturing equipment, providing efficient and low-consumption core manufacturing tools for missions such as deep space exploration and space station expansion, and has significant engineering application value. Attached Figure Description

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

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

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

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

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

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

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

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

[0047] Figure 9 This is a schematic diagram of the frame structure of the present invention.

[0048] Labels in the diagram: 1. Frame; 2. Movable bending roller; 3. Fixed bending roller; 4. Height adjustment mechanism; 5. Adjustment frame; 6. Guide roller assembly; 11. Lower base plate; 12. Upper top plate; 13. Support rod; 14. Guide rod; 21. First motor; 22. First worm gear; 23. First telescopic assembly; 24. First bending roller; 31. Second bending roller; 32. Slot; 51. Moving plate; 52. Side plate; 53. Second motor; 54. Worm gear 55. Rod assembly; 56. Second worm gear; 57. Third worm gear; 58. Suspension rod; 61. Guide roller assembly; 62. Second telescopic assembly; 41. Fifth worm gear; 42. Third motor; 43. Third telescopic assembly; 71. Main shaft; 72. Rotating worm wheel; 73. Sleeve; 74. Mounting rail; 75. Threaded sleeve; 76. Connecting sleeve; 81. Mounting base plate; 82. Drive gear; 83. Roller; 84. Idler wheel; 85. Fixing plate. Detailed Implementation

[0049] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides detailed implementation methods and processes; however, the scope of protection 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-diameter three-roll 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. The support rods 13 are vertically connected to 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. The two first bending rollers 24 of the movable bending rollers 2 and the second bending roller 31 of the fixed bending rollers 3 are distributed in an isosceles triangle to form the basic rolling zone for pipe forming. The guide roller mechanism drives the adjusting frame 5 to rise and fall through the height adjusting mechanism 4. The three guide roller assemblies 6 are located at the bottom of the moving plate 51 and inside the two side plates 52, respectively, for multi-directional constraint during the pipe forming process.

[0052] Key features and functions:

[0053] Isosceles triangular roller distribution: A symmetrical pressure field is formed by three rollers to ensure uniform stress when the pipe is bent;

[0054] Inclined axis design: The frame and roller axis form an angle of 3°-10° to reduce pipe feeding resistance and adapt to continuous feeding in the microgravity environment of space;

[0055] Modular frame: Support rod 13 adopts quick-release corner bracket connection, which facilitates on-orbit replacement or expansion of functional modules.

[0056] Example 2: Dynamic Adjustment of the Bending Roller Mechanism

[0057] like Figure 2 As shown, the movable bending roller 2 is linked to the first telescopic assembly 23 via the first worm gear 22. The first motor 21 drives the first worm gear 22 to rotate, which in turn drives the worm wheels in the two first telescopic assemblies 23 to rotate synchronously, thereby controlling the lifting and lowering of the two first bending rollers 24. The L-shaped structure of the bending frame 3 has a slot 32 on its side, and the second bending roller 31 can be quickly inserted into the slot 32 through the slot, which can realize the replacement of rollers with different diameters.

[0058] Adjustment process:

[0059] Diameter adjustment: The first motor 21 starts, and the worm gear drive causes the two first bending rollers 24 to rise or fall synchronously, changing the height of the vertex 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 will automatically fix it.

[0061] Pressure compensation: The first telescopic component 23 has a built-in pressure sensor that provides real-time feedback on the roller pressure and uses a worm gear for fine-tuning to prevent the pipe from being crushed.

[0062] Example 3: Multidimensional Cooperative 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 via the fifth worm gear 41, causing the moving plate 51 to move up and down along the guide rod 14. The adjustment frame 5 is internally equipped with a second worm gear 55, a third worm gear 56, and a fourth worm gear 57, achieving three-axis linkage through a bevel gear structure. The second motor 53 drives the worm gear and worm wheel device 54, causing the second worm gear 55 and the fourth worm gear 57 to rotate synchronously, which in turn drives the third worm gear 56 to rotate via the bevel gear set.

[0064] Cooperative control logic:

[0065] Vertical adjustment: The third motor 42 drives the fifth worm gear 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 gear group, which drives the worm wheels in the three second telescopic components 62 to rotate, thereby realizing the lateral extension and retraction of the guide roller device 61;

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

[0068] Example 4: Synchronous Drive Mechanism for Roller Units

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

[0070] Synchronization guarantee measures:

[0071] Gear meshing accuracy: The drive gear 82 and idler gear 84 adopt a helical tooth design to eliminate transmission backlash and ensure consistent linear velocity of multiple rollers;

[0072] Modular replacement: The mounting base plate 81 can be disassembled as a whole, allowing for quick replacement of the roller unit to meet different tube surface treatment requirements (such as anti-stick coating, knurling texture);

[0073] Torque balance: Each roller 83 shaft end is equipped with a magnetic powder clutch, which automatically reduces torque when a single point of jamming occurs, thus avoiding scratches on the pipe surface.

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

[0075] like Figure 7 As shown, the telescopic unit converts rotational motion into linear motion of the threaded sleeve 75 by meshing with a worm gear 72. The main shaft 71 and the threaded sleeve 75 adopt a ball thread pair, achieving a transmission efficiency of over 90%. The sleeve 73 has multiple sets of pin holes on its surface, and the telescopic function is locked by adjusting the position of the pins.

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

Claims

1. A variable-diameter three-roll bending mechanism based on on-orbit manufacturing, characterized in that: Includes the frame, bending roller mechanism, and guide roller mechanism; The frame includes a lower base plate, an upper top plate, and support rods. The lower base plate and the upper top plate are arranged in parallel, and the support rods are arranged at the four corners between the lower base plate and the upper top plate. The bending roller mechanism includes a movable bending roller and a fixed bending roller. Both the movable and fixed bending rollers are located on the top of the lower base plate. The movable bending roller has two parallel first bending rollers. The fixed bending roller includes a bending frame, and the bending frame has 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 includes a height adjustment mechanism, an adjustment frame, and guide roller assemblies. The height adjustment mechanism is fixedly installed at the bottom of the top plate. The adjustment frame includes a horizontally placed movable plate and side plates with vertical movable plates on the left and right sides. The movable plate is connected to the height adjustment mechanism. There are three guide roller assemblies, which are respectively located at the bottom of the movable plate and on the inner side 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 a motor-driven gear transmission. The base is equipped with a ruler for calibration. After the corresponding angle is adjusted, the motor stops driving and is locked. The movable bending roller includes a first motor, a first worm gear, and two vertically arranged first telescopic components; Both ends of the first worm are fixedly mounted on the lower base plate via bearing seats. The first motor is fixedly mounted on the lower base plate, and the output end of the first motor is drivenly connected to one end of the first worm. The first telescopic assembly is fixedly mounted on the top of the first worm and is drivenly connected to the first worm. The first bending roller is located at the output end of the first telescopic assembly. The transmission between the first worm and the worm wheel structure of the first telescopic assembly is converted into the telescopic movement of the first telescopic assembly in the vertical direction, thereby driving the first bending roller to achieve the lifting function.

2. The variable-diameter three-roll bending mechanism based on on-orbit manufacturing according to claim 1, 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 engaged.

3. The variable-diameter three-roll bending mechanism based on on-orbit manufacturing according to claim 2, characterized in that, The height adjustment mechanism includes a fifth worm gear, a third motor, and two vertically arranged third telescopic components; The two ends of the fifth worm gear are fixedly installed at the bottom of the upper top plate via bearing seats. The third motor is fixedly installed at the bottom of the upper top plate, and the output end of the third motor is connected to one end of the fifth worm gear. The third telescopic assembly is fixedly installed at the bottom of the upper top plate and is connected to the fifth worm gear via a transmission connection. The top of the moving plate is fixedly connected to the output ends of the two third telescopic assemblies. A guide rod is fixedly installed between the lower bottom plate and the upper top plate. The moving plate is movably installed on the guide rod. The transmission between the fifth worm gear and the worm wheel structure of the third telescopic assembly is converted into the telescopic movement of the third telescopic assembly in the vertical direction, thereby driving the moving plate to achieve the lifting and lowering function.

4. A variable-diameter three-roll bending mechanism based on on-orbit manufacturing according to claim 3, characterized in that, The adjusting frame also includes a second motor, a worm gear device, a second worm, a third worm, and a fourth worm; The third worm is fixedly mounted on the bottom of the moving plate at both ends by bearings. The second and fourth worms are respectively fixedly mounted on the sides of the two side plates. 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 or fourth worm. 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 connected by a bevel gear structure. The guide roller assembly includes a guide roller device and a second telescopic assembly. The guide roller device is fixedly installed at the output end of the second telescopic assembly. The three second telescopic assemblies are respectively fixedly connected to the two side plates and the movable plate. The three second telescopic assemblies are respectively connected to the second worm, the third worm and the fourth worm for transmission.

5. A variable-diameter three-roll bending mechanism based on on-orbit manufacturing according to claim 4, characterized in that, The guide roller device, the first bending roller, and the second bending roller each include roller units, and the roller units include: Multiple rollers are arranged at intervals along their axial direction; Each roller has a corresponding drive gear, which is coaxially fixed to the end of the corresponding roller. An idler gear is provided between adjacent drive gears, and the idler gear meshes with the two adjacent drive gears simultaneously to achieve transmission synchronization; And mounting base plates for mounting drive gears, rollers and idler gears.

6. A variable-diameter three-roll bending mechanism based on on-orbit manufacturing according to claim 5, characterized in that, The second bending roller includes a mounting base plate with slots on both the left and right sides that engage with the slot.

7. A variable-diameter three-roll bending mechanism based on on-orbit manufacturing according to claim 6, characterized in that, The first bending roller and guide roller device also includes a fixing plate, which is fixedly installed on the side of the mounting base plate and is engaged with the mounting rail.

8. A variable-diameter three-roll bending mechanism based on on-orbit manufacturing according to claim 7, characterized in that, The first telescopic component, the second telescopic component, and the third telescopic component all include a telescopic unit, wherein the telescopic unit includes: A rotating worm gear can be used for meshing and transmission with a second worm, a third worm, a fourth worm, a fifth worm, and a first worm. The spindle is fixedly connected to the rotating worm gear via a keyway; The threaded sleeve is threaded to one end of the spindle, converting the rotation of the spindle into linear motion of the threaded sleeve. Mounting rail, used to mount guide roller device, is fixedly mounted on one end of threaded sleeve; A sleeve is fitted onto the surface of a threaded sleeve. A pin hole is provided on the surface, and a pin is installed in the pin hole. A fixing cap is provided at one end of the sleeve. The fixing cap restricts the elongation of the threaded sleeve. The sleeve is fixed to the connecting sleeve by tightening the pin.

9. A variable-diameter three-roll bending mechanism based on on-orbit manufacturing according to claim 8, characterized in that, The surface of the main shaft is rotatably connected to a connecting sleeve via a bearing. The surface of the connecting sleeve of the horizontally placed telescopic unit is connected to a suspension rod, and the top end of the suspension rod is connected to the moving plate.

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