High-folding-unfolding-ratio cylindrical surface unfolding and folding mechanism with solid reflecting surface

Abstract

The invention discloses a high-folding-unfolding-ratio cylindrical surface unfolding and folding mechanism with a solid reflecting surface. The high-folding-unfolding-ratio cylindrical surface unfolding and folding mechanism comprises a center panel unfolding and folding mechanism, a radial unfolding and folding mechanism, a left side panel unfolding and folding mechanism and a right side panel unfolding and folding mechanism. The central panel unfolding and folding mechanism is composed of shear fork type units, and axial stretching movement can be achieved. The left side panel unfolding and folding mechanism and the right side panel unfolding and folding mechanism are symmetrically distributed relative to the center panel unfolding and folding mechanism, the radial unfolding and folding mechanisms are installed at the two ends respectively, and the radial unfolding and folding mechanisms are connected with bases at the two ends of the center panel unfolding and folding mechanism. The left and right side panel unfolding and folding mechanisms have the degree of freedom of 1 and synchronously move in the radial direction and the axial direction; in the complete unfolding process, a curved surface formed by the left side panel unfolding and folding mechanism and the right side panel unfolding and folding mechanism can be an appointed paraboloid, a cylindrical surface and other cylindrical surfaces, and in the complete folding process, all the panels are compactly folded, and the size is reduced. And the designed unfolding and folding mechanism is used as a basic unit, axial expansion is carried out, and the unfolding and folding mechanism with a larger size can be expanded.

Description

Technical Field

[0001] The present invention belongs to the field of mechanical technology, and specifically relates to a high-folding-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 folded state, the mechanism can be folded 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 specified orbit; in addition, it is also hoped that the mechanism has a single degree of freedom feature to ensure reliable unfolding and folding. Mechanisms with solid reflective surfaces have higher 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 deployable 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 folded, the panels are 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 discloses a cylindrical deployable mechanism with a high refraction-expansion ratio and a solid reflective surface, comprising a central panel deployable mechanism, a left panel deployable mechanism, a right panel deployable mechanism and a radial deployable mechanism.

[0005] The central panel unfolding and retracting mechanism has n layers of unit reflection panels between the front base and the rear base, where n is greater than or equal to 4. Adjacent unit reflection panels, and the unit reflection panels, the front base and the rear base are connected by connecting rods to form a rotation pair, forming a scissor-fork structure.

[0006] The left panel unfolding and retracting mechanism has the same structure as the right panel unfolding and retracting mechanism, and is symmetrically arranged with respect to the center panel unfolding and retracting mechanism. The left panel unfolding and retracting mechanism and the right panel unfolding and retracting mechanism are composed of n layers of panels arranged in the front-to-back direction, and each layer has three arc panels, including right-angled trapezoidal panels on the left and right sides, an isosceles triangle panel in the middle, and the hypotenuse is aligned with the right-angled trapezoidal panels on both sides. Among them, in the panels located at the front and the last layer, the long sides of the isosceles trapezoidal panels face the outer layer; the long sides or short sides of the isosceles trapezoidal panels between the adjacent two layers of panels are connected and aligned.

[0007] The adjacent panels are rotatably connected, and a rotation pair is formed between the adjacent straight sides of the triangles, so that the adjacent straight sides of the trapezoids and the adjacent hypotenuses of the isosceles right-angled trapezoids and the hypotenuses of the triangles can rotate around a virtual rotation axis located above the inner arc surfaces of the two. As a result, the entire panel presents a W-shaped movement in the radial direction during the folding process, and the length in the axial direction becomes smaller.

[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 has a longitudinal hole in the middle, into which the telescopic rod is inserted; one end of the right diagonal support rod and the left diagonal support rod is 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 slots 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.

[0010] The radial expansion and retraction mechanism is 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 rear 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 to connect with the connecting seat 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 above-mentioned left panel unfolding and retracting mechanism is realized by the radial unfolding and retracting mechanisms on the front and rear sides cooperating with the openings and strip holes designed on the left upper and lower positions of the front base and the rear base in the center panel unfolding and retracting mechanism. Similarly, the right panel unfolding and retracting mechanism is realized by the radial unfolding and retracting mechanisms on the front and rear sides cooperating with the openings and strip holes designed on the right sides of the front base and the rear base in the center panel unfolding and retracting mechanism in the same connection 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 respectively rotate toward the center base, thereby realizing the retraction of the radial expansion and retraction mechanism, and driving the right panel expansion and retraction mechanism to retract synchronously during 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 during 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 / expansion ratio cylindrical retractable mechanism of the present invention can form a complete cylindrical reflective surface in a fully expanded state, and the panel can be compactly folded in a fully retracted state.

[0015] 2. The high folding / expansion ratio cylindrical expandable / 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 folding process.

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

[0017] 4. The high folding / expansion ratio cylindrical expandable 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 It is a schematic diagram of the overall structure of the high folding-expansion 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 It is a schematic diagram of the structure of the unit reflection panel in the central panel unfolding and retracting mechanism;

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

[0022] Figure 5 It is a schematic diagram of the structure of the right panel unfolding and retracting mechanism in the high folding and aspect ratio cylindrical unfoldable and 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 unfolding and retracting mechanism;

[0024] Figure 7 It is a schematic diagram of the connection structure configuration A between each panel;

[0025] Figure 8 It is a structural schematic diagram of the right side panel unfolding and retracting mechanism of the high folding and aspect ratio cylindrical unfoldable and retractable mechanism of the present invention when it is in the unfolding and retracting intermediate state;

[0026] Fig. 9 It is a schematic diagram of the structure of the radial unfolding and retracting mechanism in the high folding and unfolding ratio cylindrical unfolding and retracting mechanism of the present invention;

[0027] Fig.10 It is a schematic diagram of the fully folded state of the high folding-to-expansion ratio cylindrical deployable mechanism of the present invention;

[0028] Fig.11 It is a schematic diagram of the axial expansion mode of the high folding / expansion ratio cylindrical expandable mechanism of the present invention.

[0029] In the figure:

[0030] 1-Center panel unfolding and retracting mechanism 2A-Left panel unfolding and retracting mechanism 2B-Right panel unfolding and retracting mechanism

[0031] 3- radial expansion and contraction 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 - rear 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 side brace 304A-Right side transfer rod 304B-Left side transfer rod 305A-right long rod 305B-left long rod DETAILED DESCRIPTION

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

[0044] The high-folding-expansion ratio cylindrical deployable mechanism with a solid reflective surface of the present invention comprises a central panel deployable mechanism 1, a left panel deployable mechanism 2A, a right panel deployable mechanism 2B and a radial deployable mechanism 3, as shown in FIG. 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] The sliding assembly 104 includes a front sliding assembly and a rear sliding assembly. Both the front sliding assembly and the rear sliding assembly have a guide rod 104a and a slider 104b, which are installed in the same way on the connecting surface of the front base 101 and the rear base 102, and the positions correspond to each other. The guide rod 102 is arranged in the vertical direction, and both ends are fixed on 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 opposite side walls between the sliders for connecting the scissor 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. Among them, the unit reflection panel 103a is a rectangular plate, having two left and right parts, and the left and right parts are connected only at the upper front end and the lower rear end to form a whole, so that a middle gap 103c is formed between the left and right parts, which is used to set the unit connecting rod 103b. At the same time, there is a front gap 103d at the upper center position of the front side of the unit reflection panel 103a, and a rear gap 103e at the lower center position of the rear side, which is used for connecting the unit reflection panels 103a and the unit reflection panel 103a with the front base 101. The front, middle and rear parts of the scissors unit 103 are also designed with a front shaft hole 103f, a middle shaft hole 103g and a rear shaft hole 103h along the left and right directions respectively. The unit connecting rod 105 is placed in the middle gap 103c, and the center position is connected with the connecting shaft fixedly inserted in the middle shaft 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 fork units, the lower end of the unit connecting rod 103b in the rear scissor fork unit is placed in the rear gap 103e of the front scissor fork unit, and is sleeved with the connecting shaft inserted and fixed in the rear axle hole 103h to form a rotation pair. The upper end of the unit connecting rod 103b in the front scissor fork unit is placed in the front gap 103d of the rear scissor fork unit, and is sleeved with the connecting shaft inserted and fixed in the front axle hole 103f to form a rotation pair.

[0050] The scissor mechanism 103 is formed by the above connection method. Among them, in the scissor unit located at the front, the lower end of the unit connecting rod 103b is connected to the joint designed on the front slider 103 through a rotating shaft to form a rotation pair, and the axis of the rotation pair is along the left and right direction; at the same time, the connector designed on the upper support block at the front is placed in the front gap 103d of the unit reflection panel 103a, and is connected with the connecting shaft inserted and fixed in the front shaft hole 103f to form a rotation pair.

[0051] The lower end of the unit connecting rod 103b of the rearmost scissor unit is connected to the slide groove opened in the front-to-back direction on the joint designed on the rear slider 103 through a rotating shaft to form a rotation pair, and has a moving pair in the front-to-back direction. At the same time, the connector designed on the upper rear support block is placed in the rear gap 103e of the unit reflection panel 103a. The connector is also designed with a slide groove opened in the front-to-back direction, which is sleeved with the connecting shaft inserted and fixed in the rear shaft hole 103h to form a rotation pair, and has a moving pair in the front-to-back direction.

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

[0053] During the unfolding process of the central panel unfolding and retracting mechanism 1 of the above structure, the slider 103 on the front base 101 moves upward along the guide rod 104a, and the front-to-rear length of the scissor mechanism 103 becomes longer, so that the rear base 102 moves away from the front base 101. On the contrary, when the slider 103 on the front base 101 moves downward along the guide rod 104a, the length of the scissor mechanism 103 becomes shorter, and the rear base 102 moves toward the front base 101. When fully unfolded, in adjacent unit reflective panels 103a, adjacent positioning protrusions 103j overlap and cooperate with the inward recesses 103i to achieve the positioning between the unit reflective panels 104; at this time, the unit connecting rod 103b is completely received in the middle gap 103c; at the same time, the connector on the upper support block of the rear base 102 is received in the positioning groove 103k designed on the rear end top surface of the rearmost unit reflective panel 104; and the top surfaces of each unit reflective panel 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] Among them, panel AB202, panel BB205, panel CB208, and panel DB211 are arranged along the front-to-back direction and are located in the middle of the overall panel unfolding and retracting mechanism. The bottom edge of panel AA belongs to the rear side of the overall panel unfolding and retracting mechanism; the top edge of panel AB202 is connected to the top edge of panel BB204; the bottom edge of panel BB204 is connected to the bottom edge of panel CB208; the top edge of panel CB208 is connected to the top edge of panel DB211; the bottom edge of panel DB211 belongs to the front side of the overall panel unfolding and retracting mechanism.

[0057] Panel AA201, panel BA204, panel CA207 and panel DA210 are located on the left side of panel AB202, panel BB205, panel CB208 and panel DB211 respectively. The top edge 201 of panel AA201 belongs to the rear side of the overall panel unfolding and retracting mechanism; the bottom edge of panel AA201 is connected to the bottom edge of panel BA204; the top edge of panel BA204 is connected to the top edge of panel CA208; the bottom edge of panel CA208 is connected to the bottom edge of panel DA210; the top edge of panel DA210 belongs to the front side of the overall panel unfolding and retracting mechanism. The hypotenuses of the above-mentioned panels AA201, BA204, CA207 and DA210 are connected to the left waists of panels AB202, BB205, CB208 and DB211 respectively.

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

[0059] The panels are spliced ​​together to form an overall panel expandable and retractable mechanism in the above manner, and the 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 is an integral cylinder in the expanded state.

[0060] The shaft equivalent mechanism has two configurations, which are respectively configuration A and configuration B. Among them, the adjacent panels connected by configuration A are: panel AA201 and panel AB202, panel AB202 and panel AC203, panel BA204 and panel BB205, panel BB205 and panel BC206, panel CA207 and panel CB208, panel CB208 and panel CC209, panel DA210 and panel DB211, panel DB211 and panel DC212, which are connected in the same way and are located in the middle of the adjacent edges of the panels.

[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 comprises a short rod A213, a long rod A214, a long rod B215, and a short rod B216. Figure 7 As shown, the short rod A213 and the short rod B216 have 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 A214 and the long rod B215 have the same size, and have three through holes at the end, middle and front end; the long rod A214 and the long rod B215 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 A214 and the long rod B215 are connected by a rotating shaft to form a revolving pair; the through holes at the top of the long rod A214, the long rod B215 and the short rod A213 and the short rod 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 arc surface of the panel are all located on the edge seams of 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] The configuration B includes a connecting rod 217 and an open connecting rod 218, both of which are L-shaped rods. The short side ends of the two connecting rods are respectively matched with the connectors designed at the connecting positions of the adjacent panels, and are connected by a rotating shaft to form a rotating pair. The long side end of the connecting rod 217 is matched with the U-shaped joint designed at the long side end of the open connecting rod 218, and is connected by a rotating shaft to form a rotating 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 revolving pair; the projections of the axes of the revolving pairs on the outer arc surfaces of the panels are all located on the edge seams of the adjacent panels.

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

[0067] The extension and retraction control of the left panel extension and retraction mechanism 2A and the right panel extension and retraction mechanism 2B of the above structure is realized by a set of radial extension and retraction mechanisms 3 symmetrically installed on the front and rear sides of each. At the same time, the connection between the left panel extension and retraction mechanism 2A and the right panel extension and retraction mechanism 2B and the center panel extension and retraction mechanism 1 is realized by the radial extension and retraction mechanism 3.

[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 structure of the central base 301 is bilaterally symmetrical, and the left and right sides are inclined surfaces that tilt upward toward the center. A rectangular hole is opened in the middle of the central base 301 along the longitudinal direction, and the telescopic rod 302 is inserted into the hole; the lower part of the telescopic rod 302 is a rectangular cross-section that fits the gap of the rectangular hole and is inserted into the rectangular hole; at the same time, sliding grooves are designed on the left and right sides of the lower part of the telescopic rod 302 along the axial direction of the telescopic rod, which are respectively 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 302 is limited by the sliding groove and the slider to prevent the telescopic rod 302 from sliding out of the rectangular hole.

[0070] The right side diagonal support rod 303A and the left side diagonal support rod 303B are both L-shaped rods, and the short side ends are connected to the top of the telescopic rod 302 through a rotation pair, and the rotation pair axis is along the front-back direction. The long side ends of the right side diagonal support rod 303A and the left side diagonal support rod 303B are U-shaped connecting ends, which have a certain inclination angle toward the center base 301.

[0071] The ends of the right transfer rod 304A and the left transfer rod 304B are respectively placed in the upper slots on the right and left sides of the central base 301, and are connected to the central base 301 through a rotating shaft to form a rotation pair, and the axis of the rotation pair is along the front-back direction. At the same time, the right transfer rod 304A and the left transfer rod 304B are also matched with the long-side U-shaped connecting ends of the right diagonal support rod 303A and the left diagonal support rod 303B, respectively, and are connected through a rotating shaft to form a rotation pair, and the axis of the rotation pair is along the front-back direction, and the connection position is close to the ends of the right transfer rod 304A and the left transfer rod 304B.

[0072] The ends of the right long rod 305A and the left long rod 305B are respectively placed in the slots on the right and left lower sides of the central base 301, and are connected to the central base 301 through a rotating shaft to form a rotation pair, and the axis of the rotation pair is along the front-back direction, thereby forming a left-right symmetrical structure about the central base 201.

[0073] The radial extension and retraction mechanism 3 symmetrically installed on the front and rear sides of the left panel extension and retraction mechanism 2A and the right panel extension and retraction mechanism 2B of the above structure is installed in the same manner. The installation manner of the radial extension and retraction mechanism 3 on the front side of the left panel extension and retraction mechanism 2A is described below: a connection seat is designed at the front side of the panel AA201 and the front side of the panel AC203 in the left panel extension and retraction mechanism 2A, and is connected to the connection seat designed on the left transfer rod 304B and the right transfer rod 304A in the radial extension and retraction mechanism 3 through the connection seat to form a rotation pair. In the left panel extension and retraction mechanism 2A, the front ends of the left transfer rod 304B and the left long rod 305B are respectively connected to the two ends of a connecting rod to form a rotation amplitude, and the axis of the rotation pair is along the front-to-back direction; similarly, in the right panel extension and retraction mechanism 2B, the front ends of the right transfer rod 304A and the right long rod 305A are respectively connected to the two ends of a connecting rod to form a rotation pair.

[0074] The above-mentioned left-side panel unfolding and retracting mechanism 2A is realized by the radial unfolding and retracting mechanisms 3 on the front and rear sides cooperating with 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-side panel unfolding and retracting mechanism 2B is realized by the radial unfolding and retracting mechanisms 3 on the front and rear sides cooperating with 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 link structures on the left and right sides of the front base 101 and the rear base 102 in the central stowage mechanism 1 are designed to be symmetrical front and back, including an upper connection hole and a lower strip hole. The strip hole is located inside the upper connection hole, inclined 45° toward the center of the base, and the angle between the line connecting the upper connection hole and the outer end of the strip hole and the longitudinal axis of the base is 45°.

[0076] When connected, the front ends of the right transfer 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 respectively connected to the left connecting holes and the strip holes of the front base 101 and the rear base 102 to form a rotation pair. The front ends of the left transfer 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 respectively connected to the right connecting holes and the strip holes of the front base 101 and the rear base 102 to form a rotation pair.

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

[0078] When the left long rod 305B in the right radial unfolding and retracting mechanism 3 rotates clockwise around the rotating pair connected to the rear base 102, the radial unfolding and retracting 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 folding of the radial unfolding and retracting mechanism 3. During the process, the right panel unfolding and retracting mechanism 2B can be synchronously folded. Fig.10 On the contrary, when the left long rod 305B rotates counterclockwise around the rotating pair connected to the rear base 102, the radial unfolding and retracting mechanism 3 is unfolded, and in the process, the right panel unfolding and retracting mechanism 2B can be synchronously unfolded, as shown in FIG. Fig.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 retracting mechanism 2A, the center panel retracting mechanism 1, and the right panel retracting mechanism 2B form a complete cylindrical reflective surface; when the mechanism is fully folded, the panels are compactly folded.

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

Claims

1. A high-folding-expansion ratio cylindrical deployable mechanism with a solid reflective surface, characterized in that: 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 unfolding and retracting mechanism comprises a front base and a rear base, wherein n layers of unit reflective panels are passed between the front base and the rear base, where n is greater than or equal to 4; adjacent unit reflective panels, and the unit reflective panels, the front base and the rear base are connected by connecting rods to form a rotating pair, thus forming a scissor-fork structure; The left panel unfolding and retracting mechanism has the same structure as the right panel unfolding and retracting mechanism, and is symmetrically arranged with respect to the central panel unfolding and retracting mechanism; the left panel unfolding and retracting mechanism and the right panel unfolding and retracting mechanism are composed of n layers of panels arranged in the front-to-back direction, and each layer has three arc panels, including right-angled trapezoidal panels on the left and right sides, and an isosceles triangle panel in the middle, and the hypotenuse is aligned with the right-angled trapezoidal panels on both sides; among the panels located at the front and the last layers, the long sides of the isosceles trapezoidal panels face the outer layer; the long sides or short sides of the isosceles trapezoidal panels between two adjacent layers of panels are connected and aligned; The adjacent panels are rotatably connected to form a rotation pair between the adjacent triangular straight sides, and at the same time, the adjacent trapezoidal straight sides and the adjacent isosceles right-angled trapezoid hypotenuses and triangular hypotenuses can rotate around a virtual rotation axis located above the inner arc surfaces of the two. As a result, the entire panel presents a W-shaped movement in the radial direction during the folding process, and the length in the axial direction becomes smaller. 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; Among them, a hole is opened in the middle of the center base along the longitudinal direction, 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 center 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 at the right and left lower sides of the center base, and are connected to the center base through a rotating shaft to form a rotating pair; The radial unfolding and retracting mechanisms are symmetrically installed on the front and rear sides of the left panel unfolding and retracting mechanism of the above structure, and the installation method is the same, by designing a connecting seat at the long side of the isosceles trapezoidal panel in the front and rear panels of the left panel unfolding and retracting mechanism and the right panel unfolding and retracting mechanism to connect with the connecting seats designed on the left transfer rod and the right transfer rod in the radial unfolding and retracting mechanism to form a rotating pair; and in the left panel unfolding and retracting 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 unfolding and retracting 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; The above-mentioned left panel unfolding and retracting mechanism is realized by the radial unfolding and retracting 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 unfolding and retracting mechanism; similarly, the right panel unfolding and retracting mechanism is realized by the radial unfolding and retracting mechanisms on the front and rear sides in the same connection manner cooperating with the openings and strip holes designed on the right side of the front base and the rear base in the center panel unfolding and retracting mechanism.

2. The high-fold-to-expansion ratio cylindrical deployable mechanism with a solid reflective surface as claimed in claim 1, characterized in that: The specific structure of the central 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 installed 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 a plurality of scissor units; the scissor unit is composed of a unit reflection panel and a unit connecting rod; a middle gap is designed on the unit reflection panel along the center dividing line in the front-back direction; at the same time, a front gap is provided at the center position of the upper part of the front side of the unit reflection panel, and a rear gap is provided at the center position of the lower part of the rear side; further, a front axis hole, a middle axis hole and a rear axis hole are respectively designed in the front, middle and rear parts of the unit reflection panel along the left and right directions; the unit connecting rod is placed in the middle gap, and the center position is connected to the connecting shaft in the middle axis hole to form a rotating pair; Between adjacent scissor units, the lower end of the unit connecting rod in the rear scissor unit is placed in the rear gap of the front scissor unit, and is sleeved with the connecting shaft inserted and fixed in the rear axle hole to form a rotation pair; the upper end of the unit connecting rod in the front scissor unit is placed in the front gap of the rear scissor unit, and is sleeved with the connecting shaft inserted and fixed in the front axle hole to form a rotation pair; Furthermore, in the scissor-type unit located at the front, the lower end of the unit connecting rod is connected to the joint designed on the front slider through a rotating shaft to form a rotating pair, and the axis of the rotating pair is along the left-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 reflecting 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 scissor-type unit located at the rear is connected to the slide 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 reflecting panel, and the connecting head is also designed with a slide 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 unfolded unit reflective panels.

4. The high-folding-expansion ratio cylindrical deployable mechanism with a solid reflective surface as claimed in claim 1, characterized in that: The connection structure between the adjacent isosceles right trapezoid hypotenuse and the triangle hypotenuse comprises 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, the middle and the front end; 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 through a rotating shaft to form a revolving pair; the through holes at the top ends of the long rod A, the long rod B and the short rod A and the short rod B are connected through 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 of 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 opening in the middle 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 respectively rotate toward the center base, thereby realizing the retraction of the radial expansion and retraction mechanism, and driving the right panel expansion and retraction mechanism to retract synchronously during 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 during 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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