Expandable light shield based on slider-crank mechanism

Abstract

The invention provides an expandable light shield based on a slider-crank mechanism, which is used for solving the technical problems that the existing expandable light shield is low in precision and low in rigidity after being expanded, and the existing rigid light shield can only be applied to a space optical system with a smaller size. According to the deployable light shield based on the crank sliding block mechanisms, the two sets of crank sliding block mechanisms which are symmetrically arranged serve as unfolding driving mechanisms of the plane light shield, and the plane light shield can be folded in the launching process of a rocket in cooperation with the pressing base and the locking device so that the small space size can be achieved; meanwhile, when a rocket arrives at an expected on-orbit position, two groups of slider-crank mechanisms are matched with the driving of an elastic driving hinge, so that the planar light shield is unfolded from a completely folded state and locked, the planar light shield has relatively high precision and structural rigidity in a working state, a new idea is provided for on-orbit application of the large-size light shield, and the application range of the large-size light shield is widened. And the blank of a large-size high-rigidity light shield is filled.

Description

Technical Field

[0001] The invention relates to a deployable sunshade, in particular to a deployable sunshade based on a crank slider mechanism. Background Art

[0002] With the increasing demand for space situational awareness, the aperture of space optical cameras has gradually increased, and the size of the components compatible with space optical cameras has also increased accordingly. Among them, the size of the sunshade, as the core component for realizing the functions of space optical cameras, has also increased significantly. At present, most of the large-sized sunshades used in space orbit are one-piece structures and do not have the function of being deployable. However, due to the limitation of rocket space, the large envelope volume of large-sized sunshades has obvious defects during rocket launch. Therefore, applying the idea of ​​foldability to large-sized sunshades is a new idea to solve this problem.

[0003] In recent years, many researchers have proposed some deployable sunshade solutions, mainly including sunshade solutions that combine rigid skeletons, elastic materials, inflatable composite materials and other new materials with flexible composite materials. However, the deployable sunshades based on the above solutions have low precision after deployment and have the limitation of low rigidity. Space optical cameras require rigid sunshades with higher rigidity. Existing solutions include a screw-driven cylindrical deployment method, but these sunshades are mostly used in smaller space optical systems. Summary of the invention

[0004] The purpose of the present invention is to solve the limitations of the existing deployable sunshade, such as low precision and low rigidity after deployment, and the technical problem that the existing rigid sunshade can only be applied to space optical systems of smaller sizes, and to provide a deployable sunshade based on a crank slider mechanism.

[0005] In order to achieve the above object, the technical solution provided by the present invention is as follows:

[0006] A deployable sunshade based on a crank slider mechanism, which is special in that it comprises a plane sunshade, a bottom plate, two elastic drive hinges and two sets of crank slider mechanisms;

[0007] The planar light shield comprises a planar substrate, fixed side plates respectively vertically connected to both sides of the planar substrate, and a plurality of light-shielding strips laterally arranged on the planar substrate;

[0008] The positions near the bottom on the outer side walls of the two fixed side panels are respectively connected to the upper surfaces of both sides of the bottom panel through elastic driving hinges; an optical through hole is axially opened on the bottom panel, and a plurality of light blocking strips are located on the side of the planar substrate facing the bottom panel;

[0009] The two groups of crank slider mechanisms have the same structure and are symmetrically arranged on both sides of the plane sunshade;

[0010] The crank slider mechanism includes a support rod, a hinge, a slide groove, a locking slider and two compression springs; one end of the support rod is hinged to the outer wall of a fixed side plate on one side through a hinge, and a pulley is arranged inside the other end; the slide groove is vertically installed on the bottom plate at a position away from the plane sunshade, and the slide groove is located on the outer side of the fixed side plate on the same side and is parallel to the fixed side plate, so as to make the pulley and the slide groove slide together;

[0011] The upper wall of the slide groove is provided with a through hole adapted to the locking slider in the vertical direction, and a clamping groove is provided at a corresponding position on the upper surface of the lower wall of the slide groove, so that the locking slider can slide up and down along the through hole of the upper wall of the slide groove, and be clamped with the clamping groove when at the lowest end; two cross bars are symmetrically arranged near the top of the locking slider, and the lower ends of the two compression springs are fixed to the upper surface of the upper wall of the slide groove, and the upper ends thereof are respectively fixedly connected to the two cross bars, so as to provide a downward clamping force to the locking slider;

[0012] The side of the lower end of the locking slider away from the plane sunshade is set as an oblique cut, and the distance between the side close to the plane sunshade and the first end of the slide groove is equal to the diameter of the pulley;

[0013] The outer side walls of the two fixed side plates are respectively provided with clamping seats, and the corresponding positions of the bottom plate are provided with two locking devices, which are used to lock the plane sunshade through the clamping seats and the corresponding locking devices when the plane sunshade is in the folded state.

[0014] Furthermore, the slider-crank mechanism further comprises a horizontal tension spring;

[0015] One end of the horizontal extension spring is arranged on the bottom plate at a position close to the elastic driving hinge, and the other end is connected to the other end of the support rod.

[0016] Furthermore, the connection position between the support rod and the fixed side plate is higher than the connection position between the elastic drive hinge and the fixed side plate.

[0017] Furthermore, the length of the support rod is greater than the length of the slide slot.

[0018] Further, the elastic drive hinge is a vortex spring locking hinge;

[0019] The hinge is a pin hinge.

[0020] Further, the elastic drive hinge is a sliding groove type vortex spring locking hinge, comprising a first fixing seat, a second fixing seat, a male hinge, a female hinge, a vortex spring, a clamping rod, a locking pin and a clamping torsion spring;

[0021] The first fixing seat is installed on the upper surface of the base, and the second fixing seat is installed on the outer side wall of the fixed side plate;

[0022] The female hinge is arranged on the first fixed seat and connected to the fixed end of the spiral spring, and the male hinge is arranged on the second fixed seat and connected to the movable end of the spiral spring, so as to make the male hinge rotate along the motion track of the movable end of the spiral spring;

[0023] A fixed shaft is installed on the female hinge, and a compression torsion spring is installed on the fixed shaft;

[0024] One end of the clamping rod is rotatably connected to the fixed shaft, and the other end is fixedly connected to the locking pin, and the locking pin is arranged corresponding to the male hinge;

[0025] A sliding groove is provided on the male hinge at a position corresponding to the locking pin, and a protrusion is provided on the male hinge below the sliding groove. The working end of the compression torsion spring presses against the locking pin, so that the locking pin cooperates with the sliding groove or the protrusion when the male hinge moves to different positions.

[0026] Furthermore, the unfolding angle of the elastically driven hinge is 90 degrees, which is used to enable the planar sunshade to be folded 90 degrees.

[0027] Further, the locking device includes a base and a locking rod arranged on the base;

[0028] The pressing seat is provided with a locking hole adapted to the locking rod;

[0029] The base is provided with an initiating device for pyrotechnics. After the initiating device for pyrotechnics is remotely controlled and detonated, the locking rod is separated from the base, thereby realizing the separation of the locking device from the pressing seat.

[0030] Furthermore, the angle between the planar substrate and the upper surface of the light-blocking strip is an obtuse angle, and each angle decreases from top to bottom; the width of the fixed side plate increases from top to bottom; the inner side walls of the two fixed side plates are respectively abutted against both ends of the multiple light-blocking strips.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention provides an expandable sunshade based on a crank slider mechanism, with two symmetrically arranged groups of crank slider mechanisms as the expansion drive mechanism of the flat sunshade, which can make the rocket fold and fold the flat sunshade during the launch process to achieve a smaller space volume through the clamping seat and the locking device; at the same time, when the rocket reaches the expected position on orbit, the two groups of crank slider mechanisms are driven by the elastic driving hinge to make the flat sunshade expand and lock from a completely folded state, so that it has higher precision and structural rigidity in the working state, which provides a new idea for the on-orbit application of large-size sunshades and fills the gap of large-size and high-rigidity sunshades.

[0033] 2. The present invention provides an expandable light shield based on a crank slider mechanism. In the fully retracted state, a locking device and a clamping seat of aerospace pyrotechnics are used to fix the flat light shield to the base plate, thereby ensuring that the light shield can still meet the required rigidity in the fully locked state during the launch process.

[0034] 3. The present invention further provides a horizontal tension spring in the crank slider mechanism. When the planar light shield is fully folded and slowly unfolded, the scroll spring at the root provides the crank slider mechanism with an unfolding torsional driving torque, and the horizontal tension spring provides the crank slider mechanism with an additional auxiliary unfolding tension driving torque, thereby ensuring reliable and stable unfolding of the planar light shield. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of an embodiment of a deployable sunshade based on a crank slider mechanism of the present invention;

[0036] Figure 2 Schematic diagram of the connection relationship between the locking slider, the slide groove and the pulley in an embodiment of the present invention;

[0037] Figure 3 It is a schematic diagram of the structure of the elastically driven hinge in an embodiment of the present invention;

[0038] Figure 4 A schematic diagram of a locking process of a vortex spring locking hinge in an embodiment of the present invention;

[0039] Figure 5 Schematic diagram of the unfolding process of the plane light shield in the embodiment of the present invention Figure 1 ;

[0040] Figure 6 Schematic diagram of the unfolding process of the plane light shield in the embodiment of the present invention Figure 2 .

[0041] The specific reference numerals are as follows:

[0042] 1. Plane sunshade; 11. Plane substrate; 12. Fixed side plate; 121. Compression seat; 13. Light blocking strip; 2. Bottom plate; 21. Locking device; 3. Elastic drive hinge; 31. First fixed seat; 32. Second fixed seat; 33. Male hinge; 34. Female hinge; 35. Volute spring; 36. Compression rod; 37. Locking pin; 38. Compression torsion spring; 4. Support rod; 41. Pulley; 5. Hinge; 6. Slide groove; 61. Card slot; 7. Locking slider; 71. Compression spring; 8. Horizontal tension spring. DETAILED DESCRIPTION

[0043] In order to make the advantages and features of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] like Figure 1 As shown, a deployable sunshade based on a crank slider mechanism comprises a planar sunshade 1, a base plate 2, two elastic drive hinges 3, and two sets of crank slider mechanisms.

[0045] The planar sunshade 1 includes a planar substrate 11, fixed side panels 12 vertically connected to both sides of the planar substrate 11, and a plurality of light-shielding strips 13 arranged transversely on the planar substrate 11, and the two ends of the plurality of light-shielding strips 13 are respectively in contact with the inner side walls of the two planar substrates 11. The angle between the planar substrate 11 and the upper surface of the light-shielding strip 13 is an obtuse angle, and each angle decreases from top to bottom. Accordingly, the width of the fixed side panels 12 increases from top to bottom. The angle between the planar substrate 11 and the upper surface of the lower light-shielding strip 13 is greater than the angle between the planar substrate 11 and the upper surface of the upper light-shielding strip 13, which can better suppress stray light.

[0046] The positions near the bottom on the outer side walls of the two fixed side panels 12 are connected to the upper surfaces on both sides of the bottom plate 2 through elastically driven hinges 3; the unfolding angle of the elastically driven hinges 3 is 90 degrees, which is used to enable the plane sunshade 1 to be folded 90 degrees. An optical through hole is axially opened on the bottom plate 2, and a plurality of light shielding strips 13 are located on the side of the plane substrate 11 facing the bottom plate 2, which are used to shield stray light in the space. At the same time, this arrangement can enable the light shielding strips 13 to be located inside the plane sunshade 1 when the plane sunshade 1 is in the folded state, effectively avoiding interference contact with the light shielding strips 13.

[0047] The two groups of crank slider mechanisms have the same structure and are symmetrically arranged on both sides of the plane sunshade 1. The crank slider mechanism includes a support rod 4, a hinge 5, a slide 6, a locking slider 7, two compression springs 71 and a horizontal tension spring 8; one end of the support rod 4 is hinged to the outer wall of the fixed side plate 12 on one side through a hinge 5, and a pulley 41 is arranged on the inner side of the other end; the slide 6 is vertically installed on the bottom plate 2 at a position away from the plane sunshade 1, and the slide 6 is located on the outer side of the fixed side plate 12 on the same side and is parallel to the fixed side plate 12, which is used to make the pulley 41 slide and cooperate with the slide 6, even if the pulley 41 slides back and forth in the slide 6. In this embodiment, the hinge 5 is a pin hinge, and other types of hinge structures can also be used in other embodiments of the present invention. Among them, in order to achieve the expected angles of the fully folded state and the unfolded state of the flat sunshade, the length of the support rod 4 needs to be slightly larger than the length of the slide slot 6; at the same time, the connection position of the support rod 4 and the fixed side panel 12 needs to be higher than the connection position of the elastic drive hinge 3 and the fixed side panel 12, that is, the support rod 4 is not parallel to the slide slot 6 in the fully folded state, so as to avoid the unfolding movement being stuck due to the dead point of the mechanism.

[0048] The locking slider 7 is used to limit the position of the pulley 41 after the flat sunshade 1 is unfolded to the right position. Figure 2As shown, the upper wall of the slide 6 is provided with a through hole along the vertical direction that matches the locking slider 7, and the corresponding position of the upper surface of the lower wall of the slide 6 is provided with a clamping groove 61, which is used to make the locking slider 7 slide up and down along the through hole of the upper wall of the slide 6, and when at the lowest end, it is clamped with the clamping groove 61. Two cross bars are symmetrically arranged near the top of the locking slider 7, and the lower ends of the two compression springs 71 are fixed to the upper surface of the upper wall of the slide 6, and their upper ends are respectively fixed to the two cross bars, which are used to provide downward compression force to the locking slider 7. At the same time, the side of the lower end of the locking slider 7 away from the plane sunshade 1 is set to an oblique cut, and the distance between the side close to the plane sunshade 1 and the head end of the slide groove 6 is equal to the diameter of the pulley 41. When the pulley 41 contacts the oblique cut of the locking slider 7, it will give the locking slider 7 an upward force to make it slide upward. After the pulley 41 passes through the locking slider 7, the locking slider 7 will slide downward under the action of the compression spring 71, and cooperate with the slot 61 to fix the pulley 41 between the locking slider 7 and the head end of the slide groove 6.

[0049] One end of the horizontal tension spring 8 is arranged on the bottom plate 2 near the elastic driving hinge 3, and the other end is connected to the other end of the support rod 4, so as to further provide auxiliary driving force to drive the planar sunshade 1 to unfold.

[0050] A clamping seat 121 is respectively provided on the outer side walls of the two fixed side panels 12, and two locking devices 21 are provided at corresponding positions on the bottom plate 2, which are used to lock the plane light shield 1 in the folded state through the clamping seat 121 and the corresponding locking device 21. Specifically, the locking device 21 includes a base and a locking rod provided on the base, and a pyrotechnic detonating device is provided in the base. A locking hole adapted to the locking rod is provided on the clamping seat 121. When the light shield needs to be opened, the pyrotechnic detonating device is detonated by remote control to separate the locking rod from the base, thereby realizing the separation of the locking device 21 from the clamping seat 121. The locking device 21 can be a pyrotechnic unlocking device commonly used in aerospace or a memory alloy unlocking device.

[0051] The present invention adopts two sets of symmetrical crank slider mechanisms as the unfolding driving mechanism of the plane sunshade 1. The two rotating pairs in the crank slider mechanism are respectively the elastic driving hinge 3 and the hinge 5, and the central axes of the two rotating pairs are parallel to each other in space. During the rocket launch process, the plane sunshade 1 is folded and retracted to achieve a smaller space volume. When the rocket reaches the expected position on the orbit, the two sets of crank slider mechanisms are driven by the scroll spring 35 and the horizontal tension spring 8 to unfold the plane sunshade 1 from the fully retracted state and lock it through the locking slider 7, which provides a new idea for the on-orbit application of large-sized sunshades.

[0052] like Figure 3As shown, the elastic drive hinge 3 in this embodiment is a sliding groove type vortex spring locking hinge. In other embodiments of the present invention, other types of existing elastic drive hinges may also be used. The sliding groove type vortex spring locking hinge includes a first fixed seat 31, a second fixed seat 32, a male hinge 33, a female hinge 34, a vortex spring 35, a clamping rod 36, a locking pin 37 and a clamping torsion spring 38. The first fixed seat 31 is installed on the upper surface of the base, and the second fixed seat 32 is installed on the outer side wall of the fixed side plate 12; the female hinge 34 is arranged on the first fixed seat 31 and connected to the fixed end of the vortex spring 35, and the male hinge 33 is arranged on the second fixed seat 32 and connected to the movable end of the vortex spring 35, so as to make the male hinge 33 rotate along the motion trajectory of the movable end of the vortex spring 35. A fixed shaft is installed on the female hinge 34, and a compression torsion spring 38 is installed on the fixed shaft; one end of the compression rod 36 is rotatably connected to the fixed shaft, and the other end is fixedly connected to the locking pin 37, and the locking pin 37 is arranged corresponding to the male hinge 33. When the male hinge 33 is locked, a sliding groove is provided on it at a position corresponding to the locking pin 37, and a protrusion is arranged on the male hinge 33 at a position below the sliding groove. The working end of the compression torsion spring 38 presses against the locking pin 37, and is used to make the locking pin 37 slide into the sliding groove for mechanical limit locking under the action of the compression torsion spring 38 when the male hinge 33 is in the initial state, and when the male hinge 33 moves away from the initial state following the scroll spring 35, the locking pin 37 is pressed against the protrusion of the male hinge 33 under the action of the compression torsion spring 38.

[0053] The locking process of the vortex spring locking hinge is as follows Figure 4 As shown, when the plane light shield 1 is in the folded state, the vortex spring 35 continuously provides the vortex spring locking hinge with a driving torque in the unfolding direction, but at this time, due to the action of the locking device 21, the vortex spring locking hinge is in a non-expanded state. When the plane light shield 1 arrives at the expected on-orbit working position with the rocket launch, the locking device 21 is unlocked, and the plane light shield 1 is driven to unfold under the combined action of the torque of the vortex spring 35 and the contraction torque of the horizontal tension spring 8. At the same time, the locking pin 37 is always pressed on the male hinge 33 under the action of the compression torsion spring 38. When the plane light shield 1 is unfolded to the predetermined working position, the locking pin 37 moves to the slide slot position of the male hinge 33, enters the slide slot under the action of the compression torsion spring 38, and is mechanically limited and locked.

[0054] like Figure 5 , Figure 6As shown, it is a schematic diagram of the unfolding process of the plane sunshade 1 using two sets of symmetrically arranged crank slider mechanisms. When the plane sunshade 1 is in a fully folded state, that is, the plane sunshade 1 is fixedly connected to the base plate 2 through the clamping seat 121 and the locking device 21, the support rod 4 is folded, and the pulley 41 on the support rod 4 is located at the end of the slide groove 6. After the locking device 21 is unlocked to eliminate the fixed constraint, the volute spring 35 and the horizontal tension spring 8 at the root provide the crank slider mechanism with unfolding torsional driving torque and tensile driving torque respectively, driving the two crank slider mechanisms to unfold according to their own motion trajectory. After unfolding to the predetermined working position, the locking pin 37 in the vortex spring locking hinge at the root slides into the sliding groove of the male hinge 33 to lock the vortex spring locking hinge. At the same time, the support rod 4 will drive the pulley 41 to slide in the direction close to the plane sunshade 1. When the pulley 41 passes through the locking slider 7, the locking slider 7 will be inserted into the slot 61 under the action of the compression spring 71 to self-lock the pulley 41. At this time, the plane sunshade 1 is fully unfolded and in a locked structural state.

[0055] The above description is only used to illustrate the technical solution of the present invention rather than to limit it. For ordinary professional and technical personnel in the field, the specific technical solution recorded in the above embodiment can be modified, or some of the technical features therein can be replaced by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution protected by the present invention.

Claims

1. A deployable sunshade based on a crank slider mechanism, characterized in that: It comprises a plane light shield (1), a bottom plate (2), two elastic drive hinges (3) and two sets of crank slider mechanisms; The planar light shield (1) comprises a planar substrate (11), fixed side plates (12) respectively vertically connected to both sides of the planar substrate (11), and a plurality of light shielding strips (13) transversely arranged on the planar substrate (11); Positions close to the bottom on the outer side walls of the two fixed side panels (12) are respectively connected to the upper surfaces of both sides of the bottom panel (2) via elastically driven hinges (3); an optical through hole is axially opened on the bottom panel (2), and a plurality of light blocking strips (13) are located on the side of the planar substrate (11) facing the bottom panel (2); The two groups of crank slider mechanisms have the same structure and are symmetrically arranged on both sides of the plane sunshade (1); The crank slider mechanism comprises a support rod (4), a hinge (5), a slide groove (6), a locking slider (7) and two compression springs (71); one end of the support rod (4) is hinged to the outer wall of a fixed side plate (12) on one side through a hinge (5), and a pulley (41) is arranged on the inner side of the other end; the slide groove (6) is vertically installed on the bottom plate (2) at a position away from the plane sunshade (1), and the slide groove (6) is located on the outer side of the fixed side plate (12) on the same side and is parallel to the fixed side plate (12), so as to make the pulley (41) and the slide groove (6) slideably cooperate; The upper wall of the slide groove (6) is provided with a through hole adapted to the locking slider (7) in the vertical direction, and a clamping groove (61) is provided at a corresponding position on the upper surface of the lower wall of the slide groove (6), which is used to make the locking slider (7) slide up and down along the through hole of the upper wall of the slide groove (6), and clamp with the clamping groove (61) at the lower end; two cross bars are symmetrically arranged near the top of the locking slider (7), and the lower ends of the two compression springs (71) are fixed to the upper surface of the upper wall of the slide groove (6), and the upper ends thereof are respectively fixedly connected to the two cross bars, so as to provide a downward clamping force to the locking slider (7); The side of the lower end of the locking slider (7) away from the plane sunshade (1) is arranged as an oblique cut, and the distance between the side close to the plane sunshade (1) and the head end of the slide groove (6) is equal to the diameter of the pulley (41); A clamping seat (121) is respectively provided on the outer side walls of the two fixed side plates (12), and two locking devices (21) are provided at corresponding positions on the bottom plate (2) for enabling the planar light shield (1) to be locked by the clamping seat (121) and the corresponding locking devices (21) when the planar light shield (1) is in a folded state.

2. The deployable sunshade based on a crank slider mechanism according to claim 1, characterized in that: The crank slider mechanism also includes a horizontal tension spring (8); One end of the horizontal tension spring (8) is arranged on the bottom plate (2) at a position close to the elastic drive hinge (3), and the other end is connected to the other end of the support rod (4).

3. A deployable sunshade based on a crank slider mechanism according to claim 2, characterized in that: The connection position between the support rod (4) and the fixed side plate (12) is higher than the connection position between the elastic drive hinge (3) and the fixed side plate (12).

4. A deployable sunshade based on a crank slider mechanism according to claim 3, characterized in that: The length of the support rod (4) is greater than the length of the slide groove (6).

5. A deployable sunshade based on a crank slider mechanism according to any one of claims 1 to 4, characterized in that: The elastic drive hinge (3) is a vortex spring locking hinge; The hinge (5) is a pin hinge.

6. The deployable sunshade based on a crank slider mechanism according to claim 5, characterized in that: The elastic drive hinge (3) is a sliding groove type scroll spring locking hinge, comprising a first fixed seat (31), a second fixed seat (32), a male hinge (33), a female hinge (34), a scroll spring (35), a clamping rod (36), a locking pin (37) and a clamping torsion spring (38); The first fixing seat (31) is installed on the upper surface of the base, and the second fixing seat (32) is installed on the outer side wall of the fixed side plate (12); The female hinge (34) is arranged on the first fixed seat (31) and connected to the fixed end of the spiral spring (35); the male hinge (33) is arranged on the second fixed seat (32) and connected to the movable end of the spiral spring (35), so as to enable the male hinge (33) to rotate along the motion track of the movable end of the spiral spring (35); The female hinge (34) is provided with a fixed shaft, and the compression torsion spring (38) is provided on the fixed shaft; One end of the clamping rod (36) is rotatably connected to the fixed shaft, and the other end is fixedly connected to the locking pin (37), and the locking pin (37) is arranged corresponding to the male hinge (33); A sliding groove is provided on the male hinge (33) at a position corresponding to the locking pin (37), and a protrusion is provided on the male hinge (33) at a position below the sliding groove. The working end of the compression torsion spring (38) is pressed against the locking pin (37) so that the locking pin (37) cooperates with the sliding groove or the protrusion when the male hinge (33) moves to different positions.

7. The deployable sunshade based on a crank slider mechanism according to claim 1, characterized in that: The unfolding angle of the elastic driving hinge (3) is 90 degrees.

8. The deployable sunshade based on a crank slider mechanism according to claim 1, characterized in that: The locking device (21) comprises a base and a locking rod arranged on the base; A pyrotechnic detonating device is arranged in the base; The pressing seat (121) is provided with a locking hole matched with the locking rod.

9. The deployable sunshade based on a crank slider mechanism according to claim 8, characterized in that: The included angle between the planar substrate (11) and the upper surface of the light shielding strip (13) is an obtuse angle, and each included angle decreases from top to bottom; The width of the fixed side plate (12) increases from top to bottom; The inner side walls of the two fixed side plates (12) are respectively in contact with two ends of the plurality of light shielding strips (13).

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