A high-fold-to-expansion ratio cylindrical deployable mechanism with a solid reflective surface

Abstract

The present invention discloses a high-folding-expansion ratio cylindrical retractable mechanism with a solid reflective surface, comprising a central panel retractable mechanism, a radial retractable mechanism, a left panel retractable mechanism, and a right panel retractable mechanism. The central panel retractable mechanism is composed of scissor-type units, which can realize axial extension movement. The left panel retractable mechanism and the right panel retractable mechanism are symmetrically distributed with respect to the central panel retractable mechanism, and radial retractable mechanisms are respectively installed at both ends, and the radial retractable mechanisms are connected to the bases at both ends of the central panel retractable mechanism. The left and right panel retractable mechanisms have 1 degree of freedom, and move synchronously in the radial and axial directions; when fully deployed, the curved surface formed by the left and right panel retractable mechanisms can be a specified parabola, cylindrical surface, or other cylindrical surface. When fully retracted, the panels are compactly folded to reduce the volume. Moreover, the retractable mechanism designed as above is used as a basic unit, which can be expanded axially to form a retractable mechanism of a larger scale.

Description

Technical Field

[0001] The present invention belongs to the field of mechanical technology, and specifically relates to a high-aspect-ratio cylindrical deployable mechanism with a solid reflective surface. Specifically, in a fully deployed state, the mechanism can form a specified cylindrical reflective surface shape, and in a fully collapsed state, the mechanism can be collapsed into a compact stack. Background Art

[0002] The rapid development of the aerospace industry has put forward a more urgent demand for larger-scale space mechanisms. However, due to the limitations of the geometric space of the launch vehicle, it is hoped that the mechanism can have a larger folding and unfolding ratio, folding during transportation to reduce the volume, and then unfolding to the specified size to start working after reaching the designated orbit; in addition, it is also hoped that the mechanism has a single degree of freedom feature to ensure reliable expansion and folding. Mechanisms with solid reflective surfaces have high surface accuracy and have broad application prospects in large space antennas, telescopes, etc. Therefore, it is necessary to design a high-folding and unfolding ratio cylindrical retractable mechanism with a solid reflective surface Summary of the Invention

[0003] In response to the above problems, the present invention proposes a high-folding-aspect-ratio cylindrical deployable mechanism with a solid reflective surface. When the mechanism is fully deployed, the solid reflective panel on its outer surface is shaped like a specified cylinder, such as a parabolic cylinder, a circular cylinder or an elliptical cylinder. When fully retracted, each panel is compactly folded. The deployable mechanism has a single degree of freedom characteristic and moves synchronously in the radial and axial directions when deployed.

[0004] The invention provides a high-folding-aspect ratio cylindrical retractable mechanism with a solid reflective surface, comprising a central panel retractable mechanism, a left panel retractable mechanism, a right panel retractable mechanism and a radial retractable mechanism.

[0005] The central panel extension and retraction mechanism has n layers of unit reflective panels between the front base and the rear base, where n is greater than or equal to 4. Adjacent unit reflective panels, as well as the unit reflective panels and the front and rear bases are connected by connecting rods to form a rotation pair, forming a scissor-type structure.

[0006] The left and right panel deployment mechanisms share the same structure and are symmetrically arranged about the center panel. They consist of n layers of panels arranged in a front-to-back direction. Each layer has three curved panels: right-angled trapezoidal panels on the left and right sides, and an isosceles triangle panel in the center, with the hypotenuse aligned with the two right-angled trapezoidal panels. In the front and back panels, the long sides of the isosceles trapezoidal panels face outward; the long or short sides of the isosceles trapezoidal panels in adjacent layers are connected and aligned.

[0007] The adjacent panels are pivotally connected, forming a revolving pair between the adjacent triangle straight sides. This also allows the adjacent trapezoidal straight sides, as well as the adjacent isosceles right-angled trapezoid hypotenuses and triangle hypotenuses, to rotate about a virtual axis located above their inner curved surfaces. This results in a W-shaped radial motion during panel retraction, while decreasing in axial length.

[0008] The radial extension and retraction mechanism realizes the extension and retraction control of the left panel extension and retraction mechanism and the right panel extension and retraction mechanism, and includes a central base, a telescopic rod, a right diagonal support rod, a left diagonal support rod, a right transfer rod, a left transfer rod, a right long rod and a left long rod.

[0009] The central base features a longitudinal opening in the middle, into which the telescopic rod is inserted. The right and left diagonal braces are connected to the top of the telescopic rod via a revolving pair. The ends of the right and left transfer rods are each connected to the central base via a pivot, forming a revolving pair. Simultaneously, the right and left transfer rods are also connected to the other ends of the right and left diagonal braces, respectively, via a pivot, forming a revolving pair. The connections are located near the ends of the right and left transfer rods. The ends of the right and left long rods are placed in slots on the right and left sides of the central base, respectively, and connected to the central base via a pivot, forming a revolving pair.

[0010] The radial expansion and retraction mechanisms are symmetrically installed on the front and rear sides of the left panel expansion and retraction mechanism of the above structure, and the installation method is the same. In the front and back panels of the left panel expansion and retraction mechanism and the right panel expansion and retraction mechanism, a connecting seat is designed at the long side of the isosceles trapezoidal panel, and the connecting seat is designed on the left transfer rod and the right transfer rod in the radial expansion and retraction mechanism to form a rotating pair; and in the left panel expansion and retraction mechanism, the left transfer rod and the front end of the left long rod are respectively connected to the two ends of a connecting rod to form a rotating amplitude; in the right panel expansion and retraction mechanism, the right transfer rod and the front end of the right long rod are respectively connected to the two ends of a connecting rod to form a rotating pair.

[0011] The left panel's retractable mechanism is achieved by coupling the front and rear radial retractable mechanisms with the left upper and lower openings and slots on the front and rear bases of the center panel's retractable mechanism. Similarly, the right panel's retractable mechanism is achieved by coupling the front and rear radial retractable mechanisms with the right upper and lower openings and slots on the front and rear bases of the center panel's retractable mechanism in the same manner.

[0012] When the left long rod in the right radial expansion and retraction mechanism rotates clockwise around the rotating pair connected to the rear base, the radial expansion and retraction mechanism moves downward as a whole. At the same time, the telescopic rod moves upward relative to the center base, and the right transfer rod and the left transfer rod rotate toward the center base respectively, thereby realizing the retraction of the radial expansion and retraction mechanism, and driving the right panel expansion and retraction mechanism to retract synchronously in the process; conversely, when the left long rod rotates counterclockwise around the rotating pair connected to the rear base, the radial expansion and retraction mechanism is expanded, and the right panel expansion and retraction mechanism can be driven to expand synchronously in the process; the expansion and retraction method of the left radial expansion and retraction mechanism is the same as that of the right radial expansion and retraction mechanism.

[0013] The advantages of the present invention are:

[0014] 1. The high-folding-aspect ratio cylindrical retractable mechanism of the present invention can form a complete cylindrical reflective surface in the fully expanded state, and the panel can be compactly folded in the fully retracted state.

[0015] 2. The high-folding-expansion ratio cylindrical expandable and retractable mechanism of the present invention has a degree of freedom of 1, and can move synchronously in the radial and axial directions during the expansion and retraction process.

[0016] 3. The high-folding-expansion-ratio cylindrical retractable mechanism of the present invention has a radial retractable mechanism, which can support the panel and effectively improve the overall rigidity performance.

[0017] 4. The high-folding-expansion-ratio cylindrical retractable mechanism of the present invention can be expanded axially and assembled into a mechanism of a larger scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of the high-folding-aspect ratio cylindrical deployable mechanism of the present invention;

[0019] Figure 2 The central panel unfolding and retracting mechanism of the high folding and unfolding ratio cylindrical unfolding and retracting mechanism of the present invention

[0020] Figure 3 Schematic diagram of the unit reflective panel structure in the central panel extension and retraction mechanism;

[0021] Figure 4 This is a schematic diagram of the connection method of multiple unit reflection panels;

[0022] Figure 5 This is a schematic diagram of the structure of the right panel retractable mechanism in the high-folding-aspect-ratio cylindrical retractable mechanism of the present invention;

[0023] Figure 6 It is a schematic diagram of the connection structure between the panels in the right panel extension and retraction mechanism;

[0024] Figure 7 Schematic diagram of the connection structure configuration A between panels;

[0025] Figure 8 This is a structural schematic diagram of the right panel retractable mechanism of the high-folding-aspect-ratio cylindrical retractable mechanism of the present invention when it is in the intermediate state of retraction;

[0026] Figure 9 This is a schematic structural diagram of the radial deployment mechanism in the high-folding-aspect-ratio cylindrical deployable mechanism of the present invention;

[0027] Figure 10 This is a schematic diagram of the fully retracted state of the high-folding-aspect-ratio cylindrical retractable mechanism of the present invention;

[0028] Figure 11 It is a schematic diagram of the axial expansion mode of the high folding-to-expansion ratio cylindrical retractable mechanism of the present invention.

[0029] In the picture:

[0030] 1-Center panel extension and retraction mechanism 2A-Left panel extension and retraction mechanism 2B-Right panel extension and retraction mechanism

[0031] 3-Radial expansion and retraction mechanism 101-Front base 102-Rear base

[0032] 103- scissor mechanism 104- sliding assembly 104a- guide rod

[0033] 104b-slider 103a-unit reflection panel 103b-unit connecting rod

[0034] 103c-middle gap 103d-front gap 103e-back gap

[0035] 103f-front axle hole 103g-middle axle hole 103h-rear axle hole 103i- inward recess 103j- positioning protrusion 103k- positioning groove 201-Panel AA 202-Panel AB 203-Panel AC

[0036] 204-Panel BA 205-Panel BB 206-Panel BC

[0037] 207-Panel CA 208-Panel CB 209-Panel CC

[0038] 210-Panel DA 211-Panel DB 212-Panel DC

[0039] 213-Short Rod A 214-Long Rod A 215-Long Rod B

[0040] 216-Short rod B 217-Connecting rod 218-Open connecting rod

[0041] 301-Center base 302-Telescopic rod 303A-Right diagonal support rod

[0042] 303B-Left diagonal support rod 304A-Right transfer rod 304B-Left transfer rod 305A-right long rod 305B-left long rod DETAILED DESCRIPTION

[0043] The present invention will be described in further detail below with reference to the accompanying drawings.

[0044] The present invention has a high-folding-aspect ratio cylindrical deployable mechanism with a solid reflective surface, including a central panel deployable mechanism 1, a left panel deployable mechanism 2A, a right panel deployable mechanism 2B and a radial deployable mechanism 3. Figure 1 shown.

[0045] The central panel unfolding and retracting mechanism 1 is composed of a front base 101, a rear base 102, a scissor mechanism 103 and a sliding assembly 104. Figure 2 The front base 101 and the rear base 102 are arranged opposite to each other, and the opposite sides serve as connecting surfaces for connecting the scissor mechanism 103 through the sliding assembly 104.

[0046] Among them, the sliding assembly 104 includes a front sliding assembly and a rear sliding assembly. The front sliding assembly and the rear sliding assembly both have a guide rod 104a and a slider 104b, which are installed in the same manner on the connecting surface of the front base 101 and the rear base 102, and the positions correspond to each other. Among them, the guide rod 102 is arranged in the vertical direction, and both ends are fixed to the support seat installed on the connecting surface. The slider 104b is slidably fitted on the guide rod 102 and can slide in the vertical direction along the guide rod 102. In the above-mentioned front sliding assembly and rear sliding assembly, connectors are designed on the upper support seat and the relative side walls between the sliders for connecting the scissors mechanism 103.

[0047] The scissor mechanism 103 is composed of four scissor units with the same structure. The scissor units are composed of a unit reflection panel 103a and a unit connecting rod 103b. Figure 3 As shown. The unit reflective panel 103a is a rectangular plate having two left and right parts. The left and right parts are connected only at the upper front end and the lower rear end to form a whole, forming a middle gap 103c between the left and right parts for setting the unit connecting rod 103b. At the same time, a front gap 103d is provided at the upper center position of the front side of the unit reflective panel 103a, and a rear gap 103e is provided at the lower center position of the rear side for connecting the unit reflective panels 103a and the unit reflective panel 103a to the front base 101. The front, middle, and rear parts of the scissor unit 103 are also respectively designed with a front axle hole 103f, a middle axle hole 103g, and a rear axle hole 103h in the left and right directions. The unit connecting rod 105 is placed in the middle gap 103c, and its center position is connected to the connecting shaft fixedly inserted in the middle axle hole 103g to form a rotating pair.

[0048] The connection between the four scissor units of the above structure and between the entire scissor mechanism 103 and the front base 101 and the rear base 102 is as follows:

[0049] like Figure 4 As shown, between adjacent scissor lift units, the lower end of the connecting rod 103b in the rear scissor lift unit is placed in the rear gap 103e of the front scissor lift unit and is sleeved with the connecting shaft inserted and fixed in the rear axle hole 103h, forming a revolving pair. The upper end of the connecting rod 103b in the front scissor lift unit is placed in the front gap 103d of the rear scissor lift unit and is sleeved with the connecting shaft inserted and fixed in the front axle hole 103f, forming a revolving pair.

[0050] The above connection method forms the scissor mechanism 103. In the frontmost scissor unit, the lower end of the unit connecting rod 103b is connected to the joint designed on the front slider 103 via a rotating shaft, forming a revolving pair, with the axis of the revolving pair running in the left-right direction. Simultaneously, the connector designed on the front upper support block is placed in the front gap 103d of the unit reflective panel 103a and sleeved with the connecting shaft inserted and fixed in the front axle hole 103f, forming a revolving pair.

[0051] The lower end of the unit connecting rod 103b of the rearmost scissor lift unit is connected to a slot extending in the fore-aft direction on the joint of the rear slider 103 via a rotating shaft, forming a rotational pair and also a translational pair. Simultaneously, a connector designed on the rear upper support block is placed within the rear gap 103e of the unit reflective panel 103a. This connector, also designed with a slot extending in the fore-aft direction, sleeves onto the connecting shaft inserted and fixed in the rear axle hole 103h, forming a rotational pair and also a translational pair.

[0052] The front lower portion of the four unit reflective panels 103a is designed with an inward recess 103i; the rear lower portion of the first three unit reflective panels 103a is designed with a positioning protrusion 103j, and the rear top surface of the rearmost unit reflective panel 104 is designed with a positioning groove 103k.

[0053] During the deployment of the center panel deployment mechanism 1 of the aforementioned structure, the slider 103 on the front base 101 moves upward along the guide rod 104a, lengthening the scissor mechanism 103 from front to back, causing the rear base 102 to move away from the front base 101. Conversely, when the slider 103 on the front base 101 moves downward along the guide rod 104a, the scissor mechanism 103 shortens, causing the rear base 102 to move toward the front base 101. When fully deployed, adjacent positioning protrusions 103j and inward recesses 103i in adjacent unit reflective panels 103a overlap to achieve positioning between the unit reflective panels 104. At this point, the unit connecting rods 103b are fully retracted within the central gap 103c. Simultaneously, the connector on the support block above the rear base 102 is retracted within the positioning groove 103k designed on the rear end top surface of the rearmost unit reflective panel 104. The top surfaces of the unit reflective panels 103a are flush.

[0054] The left panel unfolding and retracting mechanism 3A and the right panel unfolding and retracting mechanism 3B have the same structure, are symmetrically distributed with respect to the central panel unfolding and retracting mechanism 1 , and are connected to the left and right sides of the central panel unfolding and retracting mechanism 1 .

[0055] like Figure 5 As shown, the left panel unfolding and retracting mechanism 2A and the right panel unfolding and retracting mechanism 2B are composed of multiple layers of panels arranged in the front-to-back direction, and both include panel AA201, panel AB202, panel AC203, panel BA204, panel BB205, panel BC206, panel CA207, panel CB208, panel CC209, panel DA210, panel DB211, and panel DC212. The upper surface of each panel is a curved surface, and panel AB202, panel BB205, panel CB208, and panel DB211 are all isosceles trapezoidal panels of equal size, and the remaining panels are all right-angled trapezoidal panels of equal size, and the length of the hypotenuse is equal to the waist length of each isosceles trapezoidal panel.

[0056] Panels AB202, BB205, CB208, and DB211 are arranged in a front-to-back direction, located in the middle of the overall panel deployment mechanism. The bottom edge of panel AA is located at the rear side of the overall panel deployment mechanism; the top edge of panel AB202 connects to the top edge of panel BB204; the bottom edge of panel BB204 connects to the bottom edge of panel CB208; the top edge of panel CB208 connects to the top edge of panel DB211; and the bottom edge of panel DB211 is located at the front side of the overall panel deployment mechanism.

[0057] Panels AA201, BA204, CA207, and DA210 are located to the left of panels AB202, BB205, CB208, and DB211, respectively. The top edge 201 of panel AA201 forms the rear edge of the overall panel unfolding and retracting mechanism; the bottom edge of panel AA201 connects to the bottom edge of panel BA204; the top edge of panel BA204 connects to the top edge of panel CA208; the bottom edge of panel CA208 connects to the bottom edge of panel DA210; and the top edge of panel DA210 forms the front edge of the overall panel unfolding and retracting mechanism. The hypotenuses of panels AA201, BA204, CA207, and DA210 connect to the left waists of panels AB202, BB205, CB208, and DB211, respectively.

[0058] As mentioned above, panels AC203, BC206, CC209, and DC212 are located to the right of panels AB202, BB205, CB208, and DB, respectively. The top edge of panel AC203 is located on the rear side of the overall panel unfolding and retracting mechanism; the bottom edge of panel AC203 connects to the bottom edge of panel BC206; the top edge of panel BC206 connects to the top edge of panel CC209; the bottom edge of panel CC209 connects to the bottom edge of panel DC210; and the top edge of panel DC212 is located on the front side of the overall panel unfolding and retracting mechanism. The hypotenuses of panels AA201, BA204, CA207, and DA210 connect to the left waists of panels AB202, BB205, CB208, and DB211, respectively.

[0059] By the above method, each panel is spliced ​​together to form an integral panel retractable mechanism, and adjacent panels are connected as a whole through a rotating shaft equivalent mechanism installed on the outer cylinder surface and a rotating pair, such as Figure 6 As shown, the expansion and contraction of each panel are realized, and each panel forms an integral cylinder in the expanded state.

[0060] The shaft equivalent mechanism has two configurations, namely Configuration A and Configuration B. Configuration A connects the following adjacent panels: panel AA 201 and panel AB 202, panel AB 202 and panel AC 203, panel BA 204 and panel BB 205, panel BB 205 and panel BC 206, panel CA 207 and panel CB 208, panel CB 208 and panel CC 209, panel DA 210 and panel DB 211, and panel DB 211 and panel DC 212. The connection method is the same and the panels are located in the middle of the adjacent edges.

[0061] The adjacent panels connected by configuration B are: panel BC206, panel CC209, panel BA204, and panel CA207. The connection method is the same and they are located in the middle of the long sides of the adjacent panels.

[0062] The configuration A includes a short rod A213, a long rod A214, a long rod B215, and a short rod B216. Figure 7 As shown, short rod A213 and short rod B216 are of the same size, and their ends are connected to two joints designed on adjacent panels via rotating shafts to form a revolving pair. Long rods A214 and B215 are of the same size, and have three through holes at the end, middle, and front ends. Long rods A214 and B215 are located between the two short rods, and their end through holes are connected to two other joints designed on adjacent panels via rotating shafts to form a revolving pair. The connection position is lower than the connection position of the two short rod ends. The middle through holes of long rods A214 and B215 are connected by a rotating shaft to form a revolving pair. The top through holes of long rods A214, B215, and short rods A213 and B216 are connected by a rotating shaft to form a revolving pair. The projections of the axes of the above-mentioned revolving pairs on the outer curved surface of the panel are all located at the joints between the adjacent panels.

[0063] The shaft equivalent mechanism obtained by the above design can realize the rotation between adjacent panels around a virtual shaft located above the inner arc surfaces of the two panels.

[0064] Configuration B includes a connecting rod 217 and an open connecting rod 218. Both rods are L-shaped, with the short ends of the two connecting rods mating with connectors designed at the junction of adjacent panels, connected by a rotating shaft to form a revolving pair. The long end of the connecting rod 217 mates with a U-shaped joint designed at the long end of the open connecting rod 218, connecting by a rotating shaft to form a revolving pair.

[0065] In addition to the above-mentioned adjacent panels, panel AA201 and panel BA204, panel CA207 and panel DA210, panel BB205 and panel CB208, panel AC203 and panel BC206, and panel CC209 and panel DC212 are also connected by rotating shafts to form a rotating pair; the projections of the axes of the rotating pairs on the outer curved surfaces of the panels are all located on the edge seams of the adjacent panels.

[0066] Through the connection method between the panels described above, when panel AA201 and panel BA204 rotate around the rotation pair connecting the two in the direction of approaching their outer arc surfaces, panel AA201 and panel AB202, panel AB202 and panel AC203 respectively move around the connecting rotation pair in the direction of approaching their inner arc surfaces, and panel BA204 and panel CA207 move around the connecting rotation pair in the direction of approaching the inner arc surfaces of the panels. The movement patterns of the other panels are the same. The entire panel exhibits a W-shaped movement in the radial direction, and its length decreases in the axial direction, such as Figure 8 shown.

[0067] The left and right panel extension / retraction mechanisms 2A and 2B are controlled by a pair of radial extension / retraction mechanisms 3 symmetrically mounted on their respective front and rear sides. These radial extension / retraction mechanisms 3 also connect the left and right panel extension / retraction mechanisms 2A and 2B to the center panel extension / retraction mechanism 1.

[0068] The radial extension and retraction mechanism 3 includes a central base 301, a telescopic rod 302, a right diagonal support rod 303A, a left diagonal support rod 303B, a right transfer rod 304A, a left transfer rod 304B, a right long rod 305A, and a left long rod 305B.

[0069] The central base 301 is bilaterally symmetrical, with its left and right sides inclined upward toward the center. A rectangular hole is longitudinally cut into the center of the central base 301, into which the telescopic rod 302 is inserted. The lower portion of the telescopic rod 302 has a rectangular cross-section that fits neatly within the rectangular hole and is inserted into it. Slide grooves are designed along the left and right sides of the lower portion of the telescopic rod 302, slidably connected to sliders on the left and right sidewalls of the central hole of the central base 301. These slide grooves and sliders limit the longitudinal movement of the telescopic rod 302, preventing it from slipping out of the rectangular hole.

[0070] The right and left diagonal braces 303A and 303B are both L-shaped, with their short ends connected to the top of the telescopic rod 302 via a pivot joint, with the pivot joint axis running in the front-to-back direction. The long ends of the right and left diagonal braces 303A and 303B are U-shaped connections, tilted toward the center base 301.

[0071] The ends of the right and left transition rods 304A and 304B are placed in the upper slots on the right and left sides of the center base 301, respectively. They are connected to the center base 301 via a rotating shaft, forming a revolving pair. The axis of the revolving pair runs in the front-to-back direction. Simultaneously, the right and left transition rods 304A and 304B also mate with the long U-shaped connecting ends of the right and left diagonal braces 303A and 303B, respectively, forming a revolving pair via a rotating shaft. The axis of the revolving pair runs in the front-to-back direction, and the connection locations are near the ends of the right and left transition rods 304A and 304B.

[0072] The ends of the right and left long rods 305A and 305B are placed in the slots on the right and left sides of the center base 301, respectively. They are connected to the center base 301 via a rotating shaft to form a rotation pair, with the axis of the rotation pair running in the front-to-back direction. This creates a bilaterally symmetrical structure with respect to the center base 201.

[0073] The radial expansion and retraction mechanisms 3, symmetrically mounted on the front and rear sides of the left and right panel expansion and retraction mechanisms 2A and 2B, are installed in the same manner. The following describes the installation of the radial expansion and retraction mechanism 3 on the front side of the left panel expansion and retraction mechanism 2A: Connecting seats are designed at the front edges of panels AA201 and AC203 in the left panel expansion and retraction mechanism 2A. These seats connect to the connecting seats designed on the left transfer rod 304B and right transfer rod 304A in the radial expansion and retraction mechanism 3, respectively, to form a revolving pair. Furthermore, in the left panel expansion and retraction mechanism 2A, the front ends of the left transfer rod 304B and the left long rod 305B are respectively connected to the ends of a connecting rod, forming a revolving pair, with the axis of the revolving pair running in the front-to-back direction. Similarly, in the right panel expansion and retraction mechanism 2B, the front ends of the right transfer rod 304A and the right long rod 305A are respectively connected to the ends of a connecting rod, forming a revolving pair.

[0074] The above-mentioned left panel unfolding and retracting mechanism 2A is realized by cooperating with the radial unfolding and retracting mechanisms 3 on the front and rear sides and the connection structure designed on the left side of the front base 101 and the rear base in the center panel unfolding and retracting mechanism 1; similarly, the right panel unfolding and retracting mechanism 2B is realized by cooperating with the radial unfolding and retracting mechanisms 3 on the front and rear sides and the connection structure designed on the right side of the front base 101 and the rear base in the center panel unfolding and retracting mechanism 1 in the same connection manner.

[0075] The central extension and stowage mechanism 1 features symmetrical front-to-back linkages on the front and rear bases 101 and 102, including an upper connection hole and a lower strip-shaped hole. The strip-shaped hole is located inward of the upper connection hole, tilted 45° toward the center of the base. A line connecting the outer ends of the upper connection hole and the strip-shaped hole forms a 45° angle with the longitudinal axis of the base.

[0076] During connection, the front ends of the right adapter rod 304A and the right long rod 305A in the radial extension and retraction mechanism 3 on the front and rear sides of the left panel extension and retraction mechanism 2A are connected to the left connecting holes and the strip hole of the front base 101 and the rear base 102, respectively, to form a rotational pair. The front ends of the left adapter rod 304B and the left long rod 305B in the radial extension and retraction mechanism 3 on the front and rear sides of the right panel extension and retraction mechanism 2B are connected to the right connecting holes and the strip hole of the front base 101 and the rear base 102, respectively, to form a rotational pair.

[0077] Thus, the high-folding-aspect-ratio cylindrical deployable mechanism of the present invention is formed. The mechanism as a whole presents a left-right symmetrical structure about the central deployable mechanism 1. The deployable and retractable methods of the left and right structures are the same. The deployable and retractable method of the right structure is described below:

[0078] When the left long rod 305B in the right radial extension and retraction mechanism 3 rotates clockwise around the rotating pair connected to the rear base 102, the radial extension and retraction mechanism 3 moves downward as a whole. At the same time, the telescopic rod 302 moves upward relative to the central base 301, and the right transfer rod 304A and the left transfer rod 304B rotate toward the central base 301 respectively, thereby realizing the retraction of the radial extension and retraction mechanism 3. During this process, the right panel extension and retraction mechanism 2B can be synchronously retracted. Figure 10 On the contrary, when the left long rod 305B rotates counterclockwise around the rotating pair connected to the rear base 102, the radial extension and retraction mechanism 3 is unfolded, and in the process, the right panel extension and retraction mechanism 2B can be synchronously unfolded, as shown in FIG. Figure 11 shown.

[0079] When the high-folding-expansion-ratio cylindrical retractable mechanism of the present invention is fully unfolded, the panels in the left panel retractable mechanism 2A, the center panel retractable mechanism 1, and the right panel retractable mechanism 2B form a complete cylindrical reflective surface; when the mechanism is fully folded, the panels are compactly folded.

[0080] The high folding and unfolding ratio cylindrical retractable mechanism of the present invention can also be expanded axially, such as Figure 11 As shown, the high folding ratio cylindrical retractable mechanism of the aforementioned design is used as the basic unit, and the number of unit reflective panels is increased by installing the unit reflective panel 103a in the central retractable unit 1. At the same time, the number of panel layers is increased by connecting the panels in the left and right side panel retractable mechanisms. The increased number of layers is the same as the vertical number of the increased unit reflective panels 103a. Further, according to the installation of the aforementioned radial retractable mechanism 3 and the connection method between it and the central retractable unit 1, the overall high folding ratio cylindrical retractable mechanism can be expanded into a larger-scale retractable mechanism.

Claims

1. A high-fold-to-expansion ratio cylindrical deployable mechanism with a solid reflective surface, characterized by: It includes a center panel unfolding and retracting mechanism, a left panel unfolding and retracting mechanism, a right panel unfolding and retracting mechanism, and a radial unfolding and retracting mechanism; The central panel extension and retraction mechanism comprises a front base and a rear base with n layers of unit reflective panels between them, where n is greater than or equal to 4; adjacent unit reflective panels, as well as the unit reflective panels and the front base and the rear base are connected by connecting rods to form a rotation pair, forming a scissor-fork structure; The left panel deployment and retraction mechanism has the same structure as the right panel deployment and retraction mechanism, and is symmetrically arranged with respect to the center panel deployment and retraction mechanism. The left and right panel deployment and retraction mechanisms are composed of n layers of panels arranged in a front-to-back direction, with each layer having three curved panels, including right-angled trapezoidal panels on the left and right sides, and an isosceles triangle panel in the middle, with the hypotenuse aligned with the right-angled trapezoidal panels on both sides. Among them, the long sides of the isosceles trapezoidal panels in the front and back panels face the outer layer, and the long sides or short sides of the isosceles trapezoidal panels in adjacent panels are connected and aligned. Adjacent panels are rotatably connected, forming a revolving pair between adjacent triangle straight sides. This allows the adjacent trapezoidal straight sides, as well as the adjacent isosceles right-angled trapezoid hypotenuses and triangle hypotenuses, to rotate about a virtual axis located above their inner arcs. As a result, the entire panel exhibits a W-shaped radial motion during retraction, while its axial length decreases. The radial expansion and contraction mechanism realizes the expansion and contraction control of the left panel expansion and contraction mechanism and the right panel expansion and contraction mechanism. It includes a central base, a telescopic rod, a right diagonal support rod, a left diagonal support rod, a right transfer rod, a left transfer rod, a right long rod and a left long rod; Among them, the middle part of the central base is opened longitudinally, and the telescopic rod is inserted into the hole; one end of the right diagonal support rod and the left diagonal support rod are connected to the top of the telescopic rod through a rotating pair; the ends of the right transfer rod and the left transfer rod are respectively connected to the central base through a rotating shaft to form a rotating pair; at the same time, the right transfer rod and the left transfer rod are also respectively connected to the other ends of the right diagonal support rod and the left diagonal support rod through a rotating shaft to form a rotating pair, and the connection position is close to the ends of the right transfer rod and the left transfer rod; the ends of the right long rod and the left long rod are respectively placed in the grooves on the right and left lower sides of the central base, and are connected to the central base through a rotating shaft to form a rotating pair; The radial expansion and retraction mechanisms are symmetrically installed on the front and rear sides of the left panel expansion and retraction mechanism, and the installation method is the same. In the front and rear panels of the left and right panel expansion and retraction mechanisms, the connecting seats designed at the long sides of the isosceles trapezoidal panels are connected to the connecting seats designed on the left transfer rod and the right transfer rod in the radial expansion and retraction mechanism to form a rotation pair; and in the left panel expansion and retraction mechanism, the left transfer rod and the front end of the left long rod are respectively connected to the two ends of a connecting rod to form a rotation amplitude; in the right panel expansion and retraction mechanism, the right transfer rod and the front end of the right long rod are respectively connected to the two ends of a connecting rod to form a rotation pair; The above-mentioned left panel expansion and retraction mechanism is realized by the radial expansion and retraction mechanisms on the front and rear sides cooperating with the openings and strip holes designed on the upper and lower positions on the left side of the front base and the rear base in the center panel expansion and retraction mechanism; similarly, the right panel expansion and retraction mechanism is realized by the radial expansion and retraction mechanisms on the front and rear sides in the same connection method cooperating with the openings and strip holes designed on the right side of the front base and the rear base in the center panel expansion and retraction mechanism.

2. The high-fold-to-expand ratio cylindrical deployable mechanism with a solid reflective surface according to claim 1, characterized in that: The specific structure of the center panel extension and retraction mechanism includes a front base, a rear base, a scissor mechanism and a sliding assembly; The sliding assembly is a slider mounted on opposite sides of the front base and the rear base and has a movable range in the up and down directions; The scissor mechanism is composed of multiple scissor units; the scissor units are composed of a unit reflective panel and a unit connecting rod; the unit reflective panel is designed with a middle gap along the center line in the front-to-back direction; at the same time, the unit reflective panel has a front gap at the upper center position of the front side, and a rear gap at the lower center position of the rear side; further, the front, middle and rear of the unit reflective panel are respectively designed along the left and right directions with a front axle hole, a middle axle hole and a rear axle hole; the unit connecting rod is placed in the middle gap, and its center position is connected to the connecting shaft in the middle axle hole to form a revolving pair; Between adjacent scissor units, the lower end of the connecting rod of the rear scissor unit is placed in the rear gap of the front scissor unit and is sleeved with the connecting shaft fixedly inserted in the rear axle hole to form a rotation pair; the upper end of the connecting rod of the front scissor unit is placed in the front gap of the rear scissor unit and is sleeved with the connecting shaft fixedly inserted in the front axle hole to form a rotation pair; Furthermore, in the scissors-type unit located at the front, the lower end of the unit connecting rod and the joint designed on the front slider are connected through a rotating shaft to form a rotating pair, and the axis of the rotating pair is along the left and right direction; at the same time, the connecting head designed on the upper part of the sliding component is placed in the front gap of the unit reflective panel, and is sleeved with the connecting shaft inserted and fixed in the front axle hole to form a rotating pair; the lower end of the unit connecting rod of the scissors-type unit located at the rear is connected to the sliding groove opened in the front-to-back direction on the joint designed on the rear slider through a rotating shaft to form a rotating pair, and has a moving pair along the front-to-back direction; at the same time, the connecting head designed on the upper part of the sliding component is placed in the rear gap of the unit reflective panel, and the connecting head is also designed with a sliding groove opened in the front-to-back direction, which is sleeved with the connecting shaft inserted and fixed in the rear axle hole to form a rotating pair, and has a moving pair along the front-to-back direction.

3. The high-fold-to-expansion ratio cylindrical deployable mechanism with a solid reflective surface as claimed in claim 2, characterized in that: The lower front end of the unit reflective panel is designed with an inward recess; the lower rear end is designed with a positioning protrusion; in adjacent unit reflective panels, the positioning protrusions and the inward recesses are overlapped to achieve positioning of the unit reflective panels after they are unfolded.

4. The high-fold-to-expand ratio cylindrical deployable mechanism with a solid reflective surface as claimed in claim 1, characterized in that: The connection structure between the hypotenuse of adjacent isosceles right trapezoids and the hypotenuse of triangles includes a short rod A, a long rod A, a long rod B, and a short rod B; wherein, the short rod A and the short rod B are of the same size, and the ends are connected to two joints designed on the adjacent panels through a rotating shaft to form a revolving pair; the long rod A and the long rod B are of the same size, and have three through holes at the end, middle and front ends; the long rod A and the long rod B are located between the two short rods, and the through holes at the ends are connected to the other two joints designed on the adjacent panels through a rotating shaft to form a revolving pair; and the connection position is lower than the connection position at the ends of the two short rods; the through holes in the middle of the long rod A and the long rod B are connected by a rotating shaft to form a revolving pair; the through holes at the top of the long rod A, the long rod B and the short rod A and the short rod B are connected by a rotating shaft to form a revolving pair; the projections of the axes of the above-mentioned revolving pairs on the outer arc surface of the panel are all located on the joints between the adjacent panels; The connection structure between adjacent trapezoidal straight sides includes a connecting rod and an open connecting rod. Both rods are L-shaped rods. The short side ends of the two connecting rods are respectively matched with the connecting heads designed at the connection positions of the adjacent panels, and are connected through a rotating shaft to form a rotating pair; the long side end of the connecting rod is matched with the U-shaped joint designed at the long side end of the open connecting rod, and is connected through a rotating shaft to form a rotating pair.

5. The high-folding-aspect ratio cylindrical deployable mechanism with a solid reflective surface as claimed in claim 1, characterized in that: The central opening of the central base is a rectangular hole, which is plugged into the telescopic rod with a rectangular cross-section; at the same time, sliding grooves are designed on the left and right sides of the lower part of the telescopic rod along the axial direction of the telescopic rod, which are respectively slidably connected with the sliders on the left and right side walls of the central opening of the central base 301, and the longitudinal movement of the telescopic rod is limited by the sliding grooves and the sliders.

6. The high-folding-aspect ratio cylindrical deployable mechanism with a solid reflective surface as claimed in claim 1, characterized in that: When the left long rod in the right radial expansion and retraction mechanism rotates clockwise around the rotating pair connected to the rear base, the radial expansion and retraction mechanism moves downward as a whole. At the same time, the telescopic rod moves upward relative to the center base, and the right transfer rod and the left transfer rod rotate toward the center base respectively, thereby realizing the retraction of the radial expansion and retraction mechanism, and driving the right panel expansion and retraction mechanism to retract synchronously in the process; conversely, when the left long rod rotates counterclockwise around the rotating pair connected to the rear base, the radial expansion and retraction mechanism is expanded, and the right panel expansion and retraction mechanism can be driven to expand synchronously in the process; the expansion and retraction method of the left radial expansion and retraction mechanism is the same as that of the right radial expansion and retraction mechanism.

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