Scroll type heat-proof and radiation-proof folding and unfolding mechanism

Abstract

The utility model relates to a scroll type heat-proof radiation-proof folding and unfolding mechanism which comprises a composite material top plate, a plurality of driving mechanisms, aluminum-plated flexible films and an aluminum-plated flexible film unlocking assembly, a plurality of arc grooves are evenly formed in the periphery of the lower end face of the composite material top plate, and the aluminum-plated flexible films are folded in the arc grooves respectively. A plurality of driving mechanisms are uniformly mounted on the lower end face of the composite material top plate and located between the adjacent arc grooves, thin-wall elastic telescopic rods are wound around the driving mechanisms, and the outer side ends of the aluminum-plated flexible films are connected with the outer side ends of the thin-wall elastic telescopic rods on the two sides; each aluminum-plated flexible film unlocking assembly comprises a fixed end, an electric heating end and a fixed rope, the fixed rope bypasses the aluminum-plated flexible film on the arc groove, the two ends of the fixed rope are connected with the fixed end and the electric heating end respectively, and the fixed rope is fused when the electric heating end emits heat, so that the aluminum-plated flexible film is released. The mechanism is simple in structure, light in weight, small in energy consumption, small in occupied space when folded and good in heat-proof and radiation-proof effect when unfolded.

Description

TECHNICAL FIELD

[0001] The utility model relates to a reel type heat and radiation prevention folding and unfolding mechanism. BACKGROUND

[0002] Some pressure vessels containing low-temperature liquid need to take some heat and radiation prevention measures when working in the light irradiation environment to slow down the evaporation rate of the low-temperature liquid. For example, for the upper stage of a low-temperature rocket, in order to slow down the evaporation rate without causing too much negative impact on the carrying capacity and reliability of the carrier rocket, the heat and radiation prevention mechanism is required to have high reliability and light weight. The traditional protection scheme is to spray a heat-resistant coating on the surface of the low-temperature container or to use an inflatable mast to form a sunshade. The former is simple in structure but not resistant to aerodynamic pressure washing, and additional protection measures need to be provided during the atmospheric flight stage, which is costly and heavy; the latter is complex in structure and low in reliability, and the gas source for unfolding the mast needs to be additionally provided with a gas circuit or a gas cylinder. Therefore, in view of the shortcomings of the traditional protection scheme, it is necessary to design and develop a heat and radiation prevention folding and unfolding mechanism that can be autonomously unfolded.

[0003] The heat and radiation prevention folding and unfolding mechanism has the advantages of low energy consumption, light weight, simple structure, high reliability, strong size adaptability, and high volume storage ratio, and can meet the protection requirements in complex environments. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses a reel type heat and radiation prevention folding and unfolding mechanism, which is simple in structure, light in weight, low in energy consumption, small in space occupation during folding, and good in heat and radiation prevention effect during unfolding.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme of a reel type heat and radiation prevention folding and unfolding mechanism, which comprises a composite material top plate, a plurality of driving mechanisms, a plurality of aluminum-plated flexible films, and a plurality of aluminum-plated flexible film unlocking assemblies. A plurality of circular arc grooves are uniformly formed in the circumferential part of the lower end face of the composite material top plate. The plurality of aluminum-plated flexible films are respectively folded in the corresponding circular arc grooves. The plurality of driving mechanisms are uniformly installed on the circumferential part of the lower end face of the composite material top plate and respectively located between adjacent circular arc grooves. Each driving mechanism is respectively wound with a thin-walled elastic expansion rod. The outer side ends of the left and right ends of each aluminum-plated flexible film are respectively connected with the thin-walled elastic expansion rods on the left and right driving mechanisms, so as to drive the aluminum-plated flexible film to unfold outward when the thin-walled elastic expansion rod pops out. The plurality of aluminum-plated flexible film unlocking assemblies are respectively arranged beside the corresponding circular arc grooves. Each aluminum-plated flexible film unlocking assembly comprises a fixed end, an electric heating end, and a fixed rope. The fixed rope passes through the aluminum-plated flexible film on the circular arc groove, and its two ends are respectively connected with the fixed end and the electric heating end, and are melted when the electric heating end generates heat, so as to release the aluminum-plated flexible film.

[0006] Further, the thin-walled elastic telescopic rod is wound along the length direction, and the thin-walled elastic telescopic rod is bent along the width direction to form a straight structure with certain rigidity when the wound thin-walled elastic telescopic rod is completely ejected, and the thin-walled elastic telescopic rod extends downward and outward when the thin-walled elastic telescopic rod is completely ejected; the aluminized flexible film is in a trapezoidal shape when the aluminized flexible film is completely unfolded, the inner side end of the aluminized flexible film is the upper base of the trapezoidal shape and is fixedly connected to the circular arc groove, and the outer side end of the aluminized flexible film is the lower base of the trapezoidal shape and is connected to the outer side end of the thin-walled elastic telescopic rod of the driving mechanism on the left and right sides.

[0007] Further, the driving mechanism comprises a mounting seat, a central rotating shaft and an unlocking assembly, the mounting seat is in an inverted U-shaped structure formed by a first side plate, a top plate and a second side plate, the central rotating shaft and the unlocking assembly are installed in the mounting seat, the unlocking assembly is installed on the inner side surface of the first side plate, and the central rotating shaft is installed on the inner side surface of the second side plate; the central rotating shaft comprises a rotating shaft and a rotating damper, the rotating shaft is installed on the rotating damper, and the rotating damper is installed on the inner side surface of the second side plate; a rectangular E is formed on the side wall of the rotating shaft, and the inner side end of the thin-walled elastic telescopic rod is fixed on the rectangular E of the rotating shaft and then wound on the rotating shaft; the unlocking assembly comprises a locking block, a spring, a supporting plate, a locking rope, a fixed plate and an electric heating plate; the rear end of the locking block is connected to the supporting plate through the spring, and the supporting plate is fixedly connected to the inner side surface of the first side plate; a protrusion is arranged on the front end of the locking block, a recess is arranged on the front end of the rotating shaft in correspondence with the protrusion, and the protrusion of the locking block and the recess of the rotating shaft are in clearance fit; the fixed plate is fixedly connected to the inner side surface of the second side plate, the electric heating plate is fixedly connected to the side wall of the locking block, and the locking rope is connected to the electric heating plate and the fixed plate at two ends and is melted when the electric heating plate generates heat.

[0008] The composite top plate is provided with an electric control module; the electric control module comprises two-way remote control switches, a battery and wires, the input ends of the two-way remote control switches are connected to the battery, and the output ends are connected to the electric heating end of the aluminized flexible film unlocking assembly and the electric heating plate of the unlocking assembly.

[0009] Further, a flat round protrusion is arranged on the rear end of the rotating shaft, the rotating damper is provided with ear holes at two ends and a flat round hole in the center, a mounting hole C is formed on the inner side surface of the second side plate in correspondence with the ear holes of the rotating damper, the rotating shaft is in interference fit with the flat round hole of the rotating damper through the flat round protrusion, and the rotating damper is fixedly installed on the mounting hole C of the second side plate through the two ear holes.

[0010] Further, the driving mechanism further comprises a guide member, and the guide member is installed on the top plate in the mounting seat.

[0011] Further, the composite material top plate is a thin-walled circular ring body with a through hole in the middle, the lower end surface of the composite material top plate changes in a convex-concave-convex manner from inside to outside along the radial direction, forming an inner convex annular surface on the inside, a middle concave annular surface in the middle, and an outer convex annular surface on the outside, the thickness of the composite material top plate at the inner convex annular surface and the outer convex annular surface is the same, and the thickness of the composite material top plate at the middle concave annular surface is smaller than the thickness at the inner convex annular surface and the outer convex annular surface; the circular arc groove is arranged on the outer convex annular surface, and the driving mechanism is mounted on the outer convex annular surface.

[0012] Further, the composite material top plate includes six driving mechanisms and six aluminum-plated flexible films, six circular arc grooves for accommodating the aluminum-plated flexible films in the folded state are arranged on the periphery of the lower end surface of the composite material top plate, and mounting holes A are arranged on the periphery of the lower end surface of the composite material top plate at the positions of the six driving mechanisms.

[0013] Further, the composite material top plate includes twelve aluminum-plated flexible film unlocking assemblies, two aluminum-plated flexible film unlocking assemblies are arranged for each aluminum-plated flexible film to lock the aluminum-plated flexible film and limit the outward expansion of the thin-walled elastic expansion rod.

[0014] Further, the outermost left and right ends of the aluminum-plated flexible film are bonded to the outer ends of the thin-walled elastic expansion rods on the left and right driving mechanisms through double-sided polyimide adhesive tape.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the utility model provides a reel type heat and radiation prevention folding and unfolding mechanism, the mechanism is simple in structure, light in quality, basically forms a flat cylindrical body when being in the folded state, and the space occupied is minimized; when being in the unfolded state, the thin-walled elastic expansion rods respectively pull the mutually independent aluminum-plated flexible films to unfold, forming a shape similar to a multi-prism frustum, so that a shadow area is formed on the surface of the covered column body, and the purpose of heat and radiation prevention is achieved. The mechanism uses the thin-walled elastic expansion rod as the framework of the heat and radiation prevention aluminum-plated flexible film, and realizes the automatic release and expansion of the heat and radiation prevention aluminum-plated flexible film by fusing the thin rope limiting the expansion of the aluminum-plated flexible film and the thin-walled elastic expansion rod, thereby realizing the passive high-reliability expansion of the heat and radiation prevention aluminum-plated flexible film, significantly reducing the complexity and energy consumption of the overall structure, and having the advantages of low energy consumption, light weight, high reliability, strong size adaptability, high volume storage ratio, etc. compared with the prior art, and can meet the heat and radiation prevention requirements in complex environments. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structure schematic view of the reel type heat and radiation prevention folding and unfolding mechanism of the utility model embodiment when being in the unfolded state;

[0017] Figures 2is a structural schematic view of the composite roof plate in the embodiment of the utility model;

[0018] Figures 3 is a structural schematic view of the composite roof plate (without the driving mechanism) in the embodiment of the utility model;

[0019] Figures 4 is a structural schematic view of the driving mechanism in the embodiment of the utility model;

[0020] Figures 5 is a structural schematic view of the driving mechanism in the embodiment of the utility model (another view);

[0021] Figures 6 is a structural schematic view of the central rotating shaft in the embodiment of the utility model;

[0022] Figures 7 is a structural schematic view of the rotating shaft in the embodiment of the utility model;

[0023] Figures 8 is a structural schematic view of the rotating damper in the embodiment of the utility model;

[0024] Figures 9 is a structural schematic view of the unlocking assembly (without the locking rope) in the embodiment of the utility model;

[0025] Figures 10 is a structural schematic view of the single-piece aluminized flexible film in the embodiment of the utility model in the unfolded state;

[0026] Figures 11 is a structural schematic view of the thin-walled elastic telescopic rod in the embodiment of the utility model.

[0027] In the drawing: 1-composite roof plate; 111-mounting hole A; 112-outer convex annular surface; 113-middle concave annular surface; 114-inner convex annular surface; 115-circular arc groove; 12-aluminized flexible film unlocking assembly; 121-fixed end; 122-electric heating end; 123-fixed rope; 2-driving mechanism; 21-top plate; 22-guiding component; 231-rotating shaft; 232-rotating damper; 233-rectangular hole E; 234-flat circular protruding block; 241-locking block; 242-spring; 243-supporting plate; 244-electric heating plate; 245-protruding block; 246-fixed plate; 25-first side plate; 251-mounting hole D; 252-locking rope; 253-mounting hole C; 26-thin-walled elastic telescopic rod; 261-outer end of the thin-walled elastic telescopic rod; 262-inner end of the thin-walled elastic telescopic rod; 27-second side plate; 3-aluminized flexible film. DETAILED DESCRIPTION

[0028] The utility model will be further described below in combination with the drawings and embodiments.

[0029] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0030] It is also important to note that the terms used herein are not intended to limit the exemplary embodiments to the specific embodiments described herein. Rather, the exemplary embodiments described herein are intended to cover all alternatives, modifications and equivalents falling within the scope of the exemplary embodiments in accordance with the present application. As used herein, unless the context clearly dictates otherwise, the use of the term "or" as a conjunction shall not be limited to mean either term or the other term but rather shall be understood to mean either term or the other term or both terms. In addition, it should also be understood that, when used in the present specification, the terms "comprise" and / or "comprising" are intended to mean that the features, steps, operations, devices, components and / or elements so described are present in the described embodiment, but not excluding the presence of one or more other features, steps, operations, devices, components and / or elements.

[0031] As shown in Figures 1-11 The present embodiment provides a reel type heat and radiation protection folding and unfolding mechanism, comprising a composite top plate 1, a plurality of driving mechanisms 2, a plurality of aluminum-coated flexible films 3 and a plurality of aluminum-coated flexible film unlocking assemblies 12, a plurality of circular arc grooves 115 are uniformly arranged on the circumferential part of the lower end surface of the composite top plate 1, the plurality of aluminum-coated flexible films 3 are respectively folded in the corresponding circular arc grooves 115, the plurality of driving mechanisms 2 are uniformly installed on the circumferential part of the lower end surface of the composite top plate 1 and are respectively located between adjacent circular arc grooves 115, a thin-walled elastic expansion rod 26 is respectively wound on each driving mechanism 2, and the outer side ends of the thin-walled elastic expansion rods 26 on the left and right driving mechanisms 2 are respectively connected with the left and right ends of each aluminum-coated flexible film 3, so as to drive the aluminum-coated flexible film 3 to unfold outward when the thin-walled elastic expansion rod 26 is popped out, the plurality of aluminum-coated flexible film unlocking assemblies 12 are respectively arranged beside the corresponding circular arc grooves 115, each aluminum-coated flexible film unlocking assembly 12 comprises a fixed end 121, an electric heating end 122 and a fixed rope 123, the fixed rope 123 passes through the aluminum-coated flexible film 3 on the circular arc groove 115, and the two ends of the fixed rope 123 are respectively connected with the fixed end 121 and the electric heating end 122, and the fixed rope 123 is melted and broken when the electric heating end 122 is heated, so as to release the aluminum-coated flexible film 3.

[0032] As shown in Figures 2-3 The composite top plate 1 is a thin-walled circular ring body with a through hole in the middle, the lower end surface of the composite top plate 1 changes in a convex-concave-convex manner from inside to outside along the radial direction, forming an inner convex annular surface on the inside, a middle concave annular surface in the middle and an outer convex annular surface on the outside, the thickness of the composite top plate 1 at the inner convex annular surface and the outer convex annular surface is the same, and the thickness of the composite top plate 1 at the middle concave annular surface is smaller than the thickness at the inner convex annular surface and the outer convex annular surface, the circular arc grooves 115 are arranged on the outer convex annular surface, and the driving mechanisms 2 are installed on the outer convex annular surface.

[0033] In the embodiment, the reel type heat and radiation protection folding and unfolding mechanism comprises 6 driving mechanisms 2, 6 aluminum coated flexible films 3 and 12 aluminum coated flexible film unlocking assemblies 12. The circumferential part of the lower end surface of the composite top plate 1 is provided with 6 circular arc grooves 115 for accommodating the aluminum coated flexible films 3 in the folded state, and the circumferential part of the lower end surface of the composite top plate 1 is provided with mounting holes A 111 at the mounting positions of the 6 driving mechanisms 2. The 6 driving mechanisms 2 are respectively mounted on the corresponding mounting holes A 111 of the circumferential part of the lower end surface of the composite top plate 1 by bolt connection.

[0034] As shown in Figures 4-6 , the driving mechanism 2 comprises a mounting seat, a central rotating shaft, an unlocking assembly and a guide member 22. The mounting seat is a reverse U-shaped structure formed by connecting a first side plate 25, a top plate 21 and a second side plate 27. The central rotating shaft and the unlocking assembly are installed in the mounting seat. The unlocking assembly is installed on the inner side surface of the first side plate 25, and the central rotating shaft is installed on the inner side surface of the second side plate 27. The central rotating shaft comprises a rotating shaft 231 and a rotating damper 232. The rotating shaft 231 is installed on the rotating damper 232, and the rotating damper 232 is installed on the inner side surface of the second side plate 27. A long rectangle E 233 is formed on the side wall of the rotating shaft 231. The inner end of the thin-walled elastic expansion rod 26 is fixed on the long rectangle E 233 of the rotating shaft 231 and then wound on the rotating shaft 231.

[0035] As shown in Figures 7-8 , a flat round protruding block 234 is arranged at the rear end of the rotating shaft 231. The rotating damper 232 is provided with ear holes at both ends and a flat round hole in the center. An installation hole C 253 is formed on the inner side surface of the second side plate 27, which matches the ear holes of the rotating damper 232. The rotating shaft 231 is in interference fit with the flat round hole of the rotating damper 232 through the flat round protruding block 234. The rotating damper 232 is fixedly installed on the installation hole C 253 of the second side plate 27 through the two ear holes.

[0036] As shown in Figure 9As shown, the unlocking assembly includes a locking block 241, a spring 242, a support plate 243, a locking rope 252, a fixing plate 246, and an electric heating plate 244. The rear end of the locking block 241 is connected to the support plate 243 via the spring 242. The support plate 243 is fixedly connected to the inner side of the first side plate 25 (the first side plate 25 has a mounting hole D251 for fixed connection with the support plate 243). The front end of the locking block 241 has a protrusion 245, and the front end of the rotating shaft 231 has a corresponding groove. The protrusion 245 of the locking block 241 and the groove of the rotating shaft 231 are fitted with a clearance to restrict the rotation of the rotating shaft 231. The fixing plate 246 is fixedly connected to the inner side of the second side plate 27. The electric heating plate 244 is fixedly connected to the side wall of the locking block 241. The two ends of the locking rope 252 are connected to the electric heating plate 244 and the fixing plate 246 respectively, and melt when the electric heating plate 244 heats up. The guide member 22 is installed on the top plate 21 inside the mounting base.

[0037] An electronic control module is installed on the composite material top plate 1. The electronic control module includes two remote control switches, a battery, and wires. The input terminals of the two remote control switches are connected to the battery, and the output terminals are connected to the heating end 122 of the aluminum-plated flexible film unlocking component 12 and the heating plate 244 of the unlocking component, respectively.

[0038] like Figures 10-11 As shown, the thin-walled elastic telescopic rod 26 is wound along its length and bent along its width, so that when the wound thin-walled elastic telescopic rod 26 is fully extended, it bends along its width to form a straight structure with a certain rigidity; when the thin-walled elastic telescopic rod 26 is fully extended, it extends downward and outward; when the aluminized flexible film 3 is fully unfolded, it is trapezoidal, with the inner end of the aluminized flexible film 3 being the upper base of the trapezoid and fixedly connected to the arc groove 115, and the outer end of the aluminized flexible film 3 being the lower base of the trapezoid, and its left and right ends being connected to the outer ends of the thin-walled elastic telescopic rod 26 on the left and right driving mechanisms 2, respectively. In this embodiment, the outermost left and right ends of the aluminized flexible film 3 are respectively bonded to the outer ends of the thin-walled elastic telescopic rod 26 on the left and right driving mechanisms 2 by double-sided polyimide tape.

[0039] like Figure 11 As shown, the thin-walled elastic telescopic rod 26 has a length of L The central angle is α (60°≤α<360°), and the thickness is... t The fiber composite material was prepared to obtain an initial radius of R The longitudinally open round bar has a stiffness that can be customized according to actual needs.

[0040] In the embodiment, the material of the composite top plate 1 is carbon fiber-epoxy resin composite material, and in some preferred embodiments, the matrix material can also be aluminum alloy, beryllium copper alloy, etc.

[0041] In the embodiment, the material of the aluminized flexible film is flexible film material, and silver-coated flexible film can also be used.

[0042] In the embodiment, when the temperature changes repeatedly in the use environment, the polyimide adhesive tape can be pasted on the aluminized flexible film in a grid shape to prevent the film from being damaged due to sudden temperature rise or drop.

[0043] In the installation of the mechanism, first, the central rotating shaft, the locking rope and the fixing plate are installed on the second side plate in a threaded connection manner; the locking block, the spring and the support plate are installed on the first side plate in a threaded connection manner, and the central rotating shaft is fixed through the interference fit of the groove and the protrusion; the inner side end of the thin-walled elastic expansion rod is wound on the central rotating shaft through the rectangular hole; the six assembled driving mechanisms are installed on the composite top plate in a threaded connection manner; the end portions of the aluminized flexible film are bonded with the double-sided polyimide adhesive tape at the outer side ends of the two thin-walled elastic expansion rods with outward radial curvature, and are fixed in the circular arc groove at the lower end of the composite top plate after folding; the aluminized flexible film unlocking assembly is installed on the composite top plate to fix the flexible film; and the installed reel type heat and radiation prevention folding and unfolding mechanism is installed at the top end of the launch vehicle payload cabin, and the installation process is completed.

[0044] The working method of the reel type heat and radiation prevention folding and unfolding mechanism provided in the embodiment includes the following steps:

[0045] S1, initially, the aluminized flexible film 3 is in a folded state, and the thin-walled elastic expansion rod 26 is in a wound state.

[0046] S2, to open the mechanism, the upper computer sends a turn-on signal to the two-way remote control switch of the electric control module on the composite top plate 1.

[0047] S3, the power supply circuit of the electric heating end 122 of the aluminized flexible film unlocking assembly 12 is turned on through the connection of one-way remote control switch, the electric heating end 122 is heated, the fixed rope 123 of the aluminized flexible film unlocking assembly 12 is heated and melted, and the aluminized flexible film 3 is released.

[0048] S4, the power supply circuit of the electric heating plate 244 of the unlocking assembly of the driving mechanism is turned on through the connection of the other way remote control switch, the electric heating plate 244 is heated, the locking rope 252 of the unlocking assembly of the driving mechanism is heated and melted, the locking block 241 is separated from the central rotating shaft under the contraction of the spring 242, so that the rotation constraint of the central rotating shaft is released, and the thin-walled elastic expansion rod 26 can be released.

[0049] S5, at this time, the aluminized flexible film 3 and the thin-walled elastic telescopic rod 26 are both unrestrained. The thin-walled elastic telescopic rod 26 automatically pops out outward under the action of the elastic strain energy stored in itself, and drives the aluminized flexible film 3 to deploy outward, forming a protective tent in the shape of a multi-prism pyramid.

[0050] The elastic strain energy comes from the thin-walled elastic telescopic rod. The thin-walled elastic telescopic rod in the unrolling (crimping direction opposite to the bending direction) state has elastic strain energy. After the rotation shaft is unlocked, the elastic strain energy is released, so that the thin-walled elastic telescopic rod rotates and pops out. The rotation damper plays a role in limiting the rotation speed of the rotation shaft in the process of rotating and popping out, so as to avoid tearing the film when the thin-walled elastic telescopic rod is deployed too fast.

[0051] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the above-mentioned technical content to obtain equivalent embodiments. However, any simple modification, equivalent change and modification made on the basis of the technical essence of the present application to the above embodiments without departing from the technical scheme of the present application shall still fall within the protection scope of the present application.

Claims

1. A heat and radiation protection folding and unfolding mechanism of a reel type, characterized in that, The composite roof (1) is provided with a plurality of circular arc grooves (115) on the periphery of the lower end surface, and the plurality of aluminum-coated flexible films (3) are respectively folded in the corresponding circular arc grooves (115). The plurality of drive mechanisms (2) are uniformly installed on the periphery of the lower end surface of the composite roof (1) and are respectively located between adjacent circular arc grooves (115). Each drive mechanism (2) is respectively wound with a thin-walled elastic expansion rod (26). The outer side ends of the left and right outermost ends of each aluminum-coated flexible film (3) are respectively connected with the outer side ends of the thin-walled elastic expansion rods (26) on the left and right drive mechanisms (2), so as to drive the aluminum-coated flexible film (3) to expand outward when the thin-walled elastic expansion rod (26) is ejected outward. The plurality of aluminum-coated flexible film unlocking assemblies (12) are respectively arranged beside the corresponding circular arc grooves (115). Each aluminum-coated flexible film unlocking assembly (12) comprises a fixed end (121), an electric heating end (122) and a fixed rope (123). The fixed rope (123) passes through the aluminum-coated flexible film (3) on the circular arc groove (115), and its two ends are respectively connected with the fixed end (121) and the electric heating end (122), and are melted when the electric heating end (122) is heated, so as to release the aluminum-coated flexible film (3).

2. A reel type heat and radiation protection folding and unfolding mechanism according to claim 1, characterized in that The thin-walled elastic expansion rod (26) is wound along the length direction, and is bent along the width direction to form a straight structure with a certain rigidity when the wound thin-walled elastic expansion rod (26) is completely ejected. The thin-walled elastic expansion rod (26) extends downward and outward when it is completely ejected. The aluminum-coated flexible film (3) is trapezoidal when it is completely unfolded. The inner side end of the aluminum-coated flexible film (3) is the upper base of the trapezoid and is fixedly connected on the circular arc groove (115). The outer side end of the aluminum-coated flexible film (3) is the lower base of the trapezoid, and the left and right ends thereof are respectively connected with the outer side ends of the thin-walled elastic expansion rods (26) on the left and right drive mechanisms (2).

3. A reel type heat and radiation protection folding and unfolding mechanism according to claim 1, characterized in that The driving mechanism (2) comprises a mounting seat, a central rotating shaft and an unlocking assembly, the mounting seat is a reverse U-shaped structure formed by a first side plate (25), a top plate (21) and a second side plate (27), the central rotating shaft and the unlocking assembly are installed in the mounting seat, the unlocking assembly is installed on the inner side of the first side plate (25), and the central rotating shaft is installed on the inner side of the second side plate (27); the central rotating shaft comprises a rotating shaft (231) and a rotating damper (232), the rotating shaft (231) is installed on the rotating damper (232), and the rotating damper (232) is installed on the inner side of the second side plate (27); a long rectangle E (233) is formed in the side wall of the rotating shaft (231), and the inner side end of the thin-wall elastic telescopic rod (26) is fixed on the long rectangle E (233) of the rotating shaft (231) and then wound on the rotating shaft (231); the unlocking assembly comprises a locking block (241), a spring (242), a supporting plate (243), a locking rope (252), a fixed plate (246) and an electric heating plate (244); the rear end of the locking block (241) is connected with the supporting plate (243) through the spring (242), and the supporting plate (243) is fixedly connected to the inner side of the first side plate (25); a convex block (245) is arranged at the front end of the locking block (241), a recess is arranged at the front end of the rotating shaft (231) in a corresponding mode, and the convex block (245) of the locking block (241) is in clearance fit with the recess of the rotating shaft (231); the fixed plate (246) is fixedly connected to the inner side of the second side plate (27), the electric heating plate (244) is fixedly connected to the side wall of the locking block (241), the locking rope (252) is connected to the electric heating plate (244) and the fixed plate (246) at two ends respectively, and the locking rope (252) is melted when the electric heating plate (244) generates heat. The composite top plate (1) is provided with an electric control module; the electric control module comprises two-way remote control switches, a battery and wires, the input ends of the two-way remote control switches are connected with the battery respectively, and the output ends are connected with the electric heating end (122) of the aluminum-plated flexible film unlocking assembly (12) and the electric heating plate (244) of the unlocking assembly respectively.

4. A reel type heat and radiation protection folding and unfolding mechanism according to claim 3, characterized in that, A flat round protruding block (234) is arranged at the rear end of the rotating shaft (231), the rotating damper (232) is provided with ear holes at two ends and a flat round hole in the center, a mounting hole C (253) matched with the ear holes of the rotating damper (232) is formed in the inner side of the second side plate (27), the rotating shaft (231) is in interference fit with the flat round hole of the rotating damper (232) through the flat round protruding block (234), and the rotating damper (232) is fixedly installed on the mounting hole C (253) of the second side plate (27) through the two ear holes.

5. A reel type heat and radiation protection folding and unfolding mechanism according to claim 3, characterized in that The driving mechanism (2) further comprises a guide member (22), and the guide member (22) is installed on the top plate (21) in the mounting seat.

6. A reel type heat and radiation protection folding and unfolding mechanism according to claim 1, characterized in that The composite roof (1) is a thin-walled circular ring body with a through hole in the middle, the lower end surface of the composite roof (1) changes in convex-concave-convex from inside to outside along the radial direction, forming an inner convex annular surface on the inside, a middle concave annular surface in the middle, and an outer convex annular surface on the outside, the thickness of the composite roof (1) at the inner convex annular surface and the outer convex annular surface is the same, and the thickness at the middle concave annular surface is smaller than the thickness at the inner convex annular surface and the outer convex annular surface; the circular arc groove (115) is provided on the outer convex annular surface, and the driving mechanism (2) is installed on the outer convex annular surface.

7. A reel type heat and radiation protection folding and unfolding mechanism according to claim 1, characterized in that It comprises 6 driving mechanisms (2) and 6 aluminum-plated flexible films (3), the lower end surface of the composite roof (1) is provided with 6 circular arc grooves (115) for accommodating the aluminum-plated flexible films (3) in the folded state, and the lower end surface of the composite roof (1) is provided with mounting holes A (111) at the positions of the 6 driving mechanisms (2), and the 6 driving mechanisms (2) are respectively installed on the corresponding mounting holes A (111) of the lower end surface of the composite roof (1) by bolt connection.

8. A reelable heat and radiation shield stowable and deployable mechanism according to claim 7, wherein, It comprises 12 aluminum-plated flexible film unlocking assemblies (12), each aluminum-plated flexible film (3) is provided with two aluminum-plated flexible film unlocking assemblies (12) for locking the aluminum-plated flexible film (3), thereby limiting the outward expansion of the thin-walled elastic expansion rod (26).

9. A reel type heat and radiation protection folding and unfolding mechanism according to claim 1, characterized in that The outermost left and right ends of the aluminum-plated flexible film (3) are respectively bonded to the outer side ends of the thin-walled elastic expansion rods (26) on the left and right driving mechanisms (2) through double-sided polyimide adhesive tape.

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