A heat and radiation protection folding and unfolding mechanism of a reel type and a working method thereof

Abstract

The present application relates to a kind of reel type heat and radiation prevention folding and unfolding mechanism, including composite top plate, multiple drive mechanisms, aluminized flexible film and aluminized flexible film unlocking assembly, multiple circular arc grooves are evenly provided in the circumferential portion of the lower end surface of composite top plate, multiple aluminized flexible films are respectively folded in each circular arc groove, multiple drive mechanisms are evenly installed on the lower end surface of composite top plate and are respectively located between adjacent circular arc grooves, each drive mechanism is wound with thin-walled elastic expansion rod, and the outside end of each aluminized flexible film is connected with the outside end of thin-walled elastic expansion rod on both sides;Each aluminized flexible film unlocking assembly includes fixed end, electric heating end and fixed rope, the aluminized flexible film on the circular arc groove is passed through by fixed rope, and its two ends are respectively connected with fixed end and electric heating end, and fuse when electric heating end generates heat, so as to release aluminized flexible film.The mechanism is simple in structure, light in weight, small in energy consumption, small in space occupied when folding, and good in heat and radiation prevention effect when unfolding.

Description

TECHNICAL FIELD

[0001] The present application relates to a reel type heat and radiation protection folding and unfolding mechanism and a working method thereof. BACKGROUND

[0002] Some pressure vessels containing low-temperature liquid need to take some heat and radiation protection measures when working in an irradiation environment to slow down the evaporation rate of the low-temperature liquid. For example, for a low-temperature upper stage of a 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 protection 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 air-filled 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, low in reliability, and the air source for mast unfolding needs to be provided with an additional air path or gas cylinder. Therefore, in view of the shortcomings of the traditional protection scheme, it is necessary to design and develop a self-unfolding heat and radiation protection folding and unfolding mechanism.

[0003] The 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. SUMMARY

[0004] The present application relates to a reel type heat and radiation protection folding and unfolding mechanism and a working method thereof.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: a reel type heat and radiation protection folding and unfolding mechanism, comprising a composite material top plate, a plurality of driving mechanisms, a plurality of aluminum-coated flexible films, and a plurality of aluminum-coated flexible film unlocking assemblies, a plurality of circular arc grooves are uniformly formed in the circumferential part of the lower end surface of the composite material top plate, the plurality of aluminum-coated 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 surface of the composite material top plate and respectively located between adjacent circular arc grooves, a thin-walled elastic expansion rod is respectively wound on each driving mechanism, the outer side ends of the thin-walled elastic expansion rods on the left and right driving mechanisms are respectively connected with the left and right ends of each aluminum-coated flexible film, so as to drive the aluminum-coated flexible film to unfold outward when the thin-walled elastic expansion rod is popped out, and the plurality of aluminum-coated flexible film unlocking assemblies are respectively arranged beside the corresponding circular arc grooves, each aluminum-coated flexible film unlocking assembly comprises a fixed end, an electric heating end, and a fixed rope, the fixed rope passes through the aluminum-coated flexible film on the circular arc groove, and the two ends of the fixed rope are respectively connected with the fixed end and the electric heating end, and the fixed rope is melted and broken when the electric heating end is heated, so as to release the aluminum-coated flexible film.

[0006] Furthermore, the thin-walled elastic telescopic rod is wound along its length and bent along its width, so that when the wound thin-walled elastic telescopic rod is fully extended, it bends along its width to form a straight structure with a certain rigidity; when the thin-walled elastic telescopic rod is fully extended, it extends downward and outward; when the aluminized flexible film is fully unfolded, it is trapezoidal, with the inner end of the aluminized flexible film being the upper base of the trapezoid and fixedly connected to the arc groove, and the outer end of the aluminized flexible film 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 rods on the left and right driving mechanisms, respectively.

[0007] Furthermore, the drive mechanism includes a mounting base, a central rotating shaft, and an unlocking assembly. The mounting base is an inverted U-shaped structure formed by connecting a first side plate, a top plate, and a second side plate. The central rotating shaft and the unlocking assembly are installed inside the mounting base. The unlocking assembly is installed on the inner side of the first side plate, and the central rotating shaft is installed on the inner side of the second side plate. The central rotating shaft includes 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 of the second side plate. A rectangular E is formed on the side wall of the rotating shaft, and the inner end of the thin-walled elastic telescopic rod is fixed to the rotating shaft. The rectangular component E is wound around a rotating shaft; the unlocking assembly includes a locking block, a spring, a support plate, a locking rope, a fixing plate, and an electric heating plate; the rear end of the locking block is connected to the support plate via the spring, and the support plate is fixedly connected to the inner side of the first side plate; the front end of the locking block has a protrusion, and the front end of the rotating shaft has a corresponding groove, with the protrusion of the locking block and the groove of the rotating shaft fitting together with a clearance; the fixing plate is fixedly connected to the inner side of the second side plate, the electric heating plate is fixedly connected to the side wall of the locking block, and the two ends of the locking rope are respectively connected to the electric heating plate and the fixing plate, and melt when the electric heating plate heats up;

[0008] An electronic control module is installed on the composite material top plate; the electronic control module includes two remote control switches, a battery and wires, the input terminals of the two remote control switches are respectively connected to the battery, and the output terminals are respectively connected to the heating end of the aluminum-plated flexible film unlocking component and the heating plate of the unlocking component.

[0009] Furthermore, the rear end of the rotating shaft is provided with a flat round protrusion, the two ends of the rotating damper are respectively provided with ear holes, and the center is provided with a flat round hole. The inner side of the second side plate is provided with a mounting hole C that matches the ear hole of the rotating damper. The rotating shaft is interference-fitted 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] Furthermore, the drive mechanism also includes a guide member, which is mounted on the top plate within the mounting base.

[0011] Further, the composite top plate is a thin-walled circular ring body with a through hole in the middle, the lower end surface of the composite top plate changes in a convex-concave-convex manner from inside to outside in 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 at the inner convex annular surface and the outer convex annular surface is the same, and the thickness of the composite 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 provided on the outer convex annular surface, and the driving mechanism is installed on the outer convex annular surface.

[0012] Further, the composite top plate is a thin-walled circular ring body with a through hole in the middle, the lower end surface of the composite top plate changes in a convex-concave-convex manner from inside to outside in 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 at the inner convex annular surface and the outer convex annular surface is the same, and the thickness of the composite 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 provided on the outer convex annular surface, and the driving mechanism is installed on the outer convex annular surface.

[0013] Further, the composite top plate is a thin-walled circular ring body with a through hole in the middle, the lower end surface of the composite top plate changes in a convex-concave-convex manner from inside to outside in 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 at the inner convex annular surface and the outer convex annular surface is the same, and the thickness of the composite 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 provided on the outer convex annular surface, and the driving mechanism is installed on the outer convex annular surface.

[0014] Further, the composite top plate is a thin-walled circular ring body with a through hole in the middle, the lower end surface of the composite top plate changes in a convex-concave-convex manner from inside to outside in 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 at the inner convex annular surface and the outer convex annular surface is the same, and the thickness of the composite 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 provided on the outer convex annular surface, and the driving mechanism is installed on the outer convex annular surface.

[0015] The application also provides a working method of the above-mentioned reel type heat and radiation prevention folding and unfolding mechanism, which comprises the following steps:

[0016] S1, initially, the aluminum-plated flexible film is in a folded state, and the thin-walled elastic expansion rod is in a wound state;

[0017] 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 in turn;

[0018] S3, the power supply circuit of the electric heating end of the aluminum-plated flexible film unlocking assembly is turned on by connecting the one-way remote control switch connected to the electric heating end, the electric heating end is heated to make the fixed rope on the aluminum-plated flexible film unlocking assembly melt, and the aluminum-plated flexible film is released;

[0019] S4, the power supply circuit of the electric heating plate of the unlocking assembly of the driving mechanism is turned on by connecting the other way remote control switch connected to the electric heating plate, the electric heating plate is heated to make the locking rope of the unlocking assembly of the driving mechanism melt, and the thin-walled elastic expansion rod is released;

[0020] S5, at this time, the aluminized flexible film and the thin-walled elastic telescopic rod are both unrestrained, the thin-walled elastic telescopic rod is automatically popped out under the action of the elastic strain energy stored in itself, drives the aluminized flexible film to deploy outward, and a multi-prism frustum-shaped protective tent is formed.

[0021] Compared with the prior art, the present application has the following beneficial effects: the present application provides a reel type heat and radiation protection folding and deploying mechanism and a working method thereof, the mechanism has simple structure and small mass, when in the folded state, the whole mechanism is basically in the form of a flat cylinder, and the space occupied is minimized; when in the deployed state, the thin-walled elastic telescopic rods respectively pull the mutually independent aluminized flexible films to deploy, forming a shape similar to a multi-prism frustum, so that a shadow area is formed on the surface of the covered column body, achieving the purpose of heat and radiation protection. The mechanism uses the thin-walled elastic telescopic rods as the framework of the heat and radiation protection aluminized flexible films, and realizes the automatic release and pop-out by fusing the thin ropes limiting the deployment of the aluminized flexible films and the thin-walled elastic telescopic rods, so as to realize the passive and highly reliable deployment of the heat and radiation protection aluminized flexible films, significantly reducing the complexity and energy consumption of the overall structure. Compared with the prior art, the present application has the advantages of low energy consumption, light weight, high reliability, strong size adaptability, high volume storage ratio, etc., and can meet the heat and radiation protection requirements in complex environments. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic view of the reel type heat and radiation protection folding and deploying mechanism of the embodiment of the present application in the deployed state;

[0023] Figures 2 is a structural schematic view of the composite top plate in the embodiment of the present application;

[0024] Figures 3 is a structural schematic view of the composite top plate (without the driving mechanism) in the embodiment of the present application;

[0025] Figures 4 is a structural schematic view of the driving mechanism in the embodiment of the present application;

[0026] Figures 5 is a structural schematic view of the driving mechanism in the embodiment of the present application (another view);

[0027] Figures 6 is a structural schematic view of the central rotating shaft in the embodiment of the present application;

[0028] Figures 7 is a structural schematic view of the rotating shaft in the embodiment of the present application;

[0029] Figures 8 is a structural schematic view of the rotating damper in the embodiment of the present application;

[0030] Figures 9is a structural schematic diagram of the unlocking assembly (without locking rope) in the embodiment of the present application;

[0031] Figures 10 is a schematic diagram of the unrolled state of the single-piece aluminized flexible film in the embodiment of the present application;

[0032] Figures 11 is a structural schematic diagram of the thin-walled elastic telescopic rod in the embodiment of the present application.

[0033] In the figure: 1 - composite top 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 - guide member; 231 - rotating shaft; 232 - rotating damper; 233 - oblong hole E; 234 - flat-circular protruding block; 241 - locking block; 242 - spring; 243 - support 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

[0034] The present application is further described below in conjunction with the accompanying drawings and embodiments.

[0035] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the present 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.

[0036] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It is further noted that the terms "comprise" (and variations of the term, such as "comprising," "comprises," and "comprised of") as used herein are intended to allow for the presence of additional features, steps, operations, elements, components, and / or groups thereof.

[0037] As Figures 1-11As shown, the embodiment provides a reel type heat and radiation prevention folding and unfolding mechanism, which comprises 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. The outer side ends of the left and right ends of each aluminum-coated flexible film 3 are respectively connected with the thin-walled elastic expansion rods 26 on the left and right driving mechanisms 2, 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 its two ends are respectively connected with the fixed end 121 and the electric heating end 122, and is melted when the electric heating end 122 is heated, so as to release the aluminum-coated flexible film 3.

[0038] As shown, 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 at the middle concave annular surface is smaller than that 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.

[0039] In this embodiment, the reel type heat and radiation prevention 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 correspondingly provided with 6 circular arc grooves 115 for accommodating the aluminum-coated flexible films 3 in the folded state. The circumferential part of the lower end surface of the composite top plate 1 is correspondingly provided with mounting holes A 111 at the positions of the 6 driving mechanisms 2. The 6 driving mechanisms 2 are respectively installed on the corresponding mounting holes A 111 on the circumferential part of the lower end surface of the composite top plate 1 by bolt connection. Two aluminum-coated flexible film unlocking assemblies 12 are provided for each aluminum-coated flexible film 3 to lock the aluminum-coated flexible film 3 and limit the outward expansion of the thin-walled elastic expansion rod 26.

[0040] As shown, Figures 4-6As shown, 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 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 on the side wall of the rotating shaft 231. The inner end of the thin-walled 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.

[0041] As shown in the drawings, Figures 7-8 The rear end of the rotating shaft 231 is provided with a flat round protruding block 234. The two ends of the rotating damper 232 are respectively provided with ear holes, and the center is provided with a flat round hole. An installation hole C 253 is formed on the inner side 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.

[0042] As shown in the drawings, Figure 9 The unlocking assembly comprises a locking block 241, a spring 242, a support 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 support plate 243 through the spring 242. The support plate 243 is fixedly connected on the inner side of the first side plate 25 (an installation hole D 251 is formed on the first side plate 25 for fixed connection with the support plate 243). 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. The convex block 245 of the locking block 241 is in clearance fit with the recess of the rotating shaft 231 to limit the rotation of the rotating shaft 231. The fixed plate 246 is fixedly connected on the inner side of the second side plate 27. The electric heating plate 244 is fixedly connected on the side wall of the locking block 241. The two ends of the locking rope 252 are respectively connected with the electric heating plate 244 and the fixed plate 246, and the locking rope 252 is melted when the electric heating plate 244 generates heat. The guide member 22 is installed on the top plate 21 in the mounting seat.

[0043] 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 respectively connected with the battery, and the output ends are respectively 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.

[0044] AsFigures 10-11 As shown, the thin-walled elastic telescopic rod 26 is wound along its length and bends 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.

[0045] 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.

[0046] In this embodiment, the composite material top plate 1 is made of carbon fiber-epoxy resin composite material. In some preferred embodiments, the matrix material may also be aluminum alloy, beryllium copper alloy, etc.

[0047] In this embodiment, the aluminum-plated flexible film material is a flexible film material, but silver-plated flexible films can also be used.

[0048] In this embodiment, when the environment experiences repeated sudden temperature changes, polyimide tape can be pasted on the aluminized flexible film in a grid pattern to prevent the film from being damaged due to sudden temperature rises or drops.

[0049] During installation, the central pivot, locking rope, and fixing plate are first installed on the second side plate using threaded connections. The locking block, spring, and support plate are then installed on the first side plate using threaded connections, and the central pivot is fixed by the interference fit of the grooves and protrusions. The inner end of the thin-walled elastic telescopic rod is wound around the central pivot through a rectangular hole. The six assembled drive mechanisms are then installed on the composite material top plate using threaded connections. The ends of the aluminized flexible film are respectively bonded to the outer ends of the two thin-walled elastic telescopic rods with radial curvature outward using double-sided polyimide tape, folded, and fixed in the arc groove at the lower end of the composite material top plate. The aluminized flexible film unlocking assembly is installed on the composite material top plate to fix the flexible film. The completed roll-type heat-proof and radiation-proof unfolding mechanism is installed on the top of the launch vehicle payload compartment, and the installation process is complete.

[0050] The embodiment also provides a working method of the above-mentioned reel type heat and radiation prevention folding and unfolding mechanism, comprising the following steps:

[0051] S1, initially, the aluminized flexible film 3 is in a folded state, and the thin-walled elastic telescopic rod 26 is in a wound state.

[0052] S2, when the mechanism is to be opened, the upper computer sends a conduction signal to the two-way remote control switch of the electric control module on the composite top plate 1.

[0053] S3, the power supply circuit of the electric heating end 122 connected to the aluminized flexible film unlocking assembly 12 is turned on by the conduction of the one-way remote control switch, the electric heating end 122 is heated and electrified, the fixed rope 123 on the aluminized flexible film unlocking assembly 12 is heated and melted, and the aluminized flexible film 3 is released.

[0054] S4, the power supply circuit of the electric heating plate 244 of the unlocking assembly connected to the driving mechanism is turned on by the conduction of the other-way remote control switch, the electric heating plate 244 is heated and electrified, the locking rope 252 of the unlocking assembly on 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 of the central rotating shaft is constrained, and the thin-walled elastic telescopic rod 26 is released.

[0055] 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 is automatically popped out outward under the action of the elastic strain energy stored therein, drives the aluminized flexible film 3 to be deployed outward, and forms a protective tent in the shape of a multi-prism pyramid.

[0056] The elastic strain energy comes from the thin-walled elastic telescopic rod. The thin-walled elastic telescopic rod in the reverse winding (crimping direction opposite to the bending direction) state has elastic strain energy. After the rotating shaft is unlocked, the elastic strain energy is released, so that the rotating shaft is popped out. The rotating damper plays a role in limiting the rotating speed of the rotating shaft in the process of the rotating shaft being popped out, so as to avoid the thin-walled elastic telescopic rod from being torn due to too fast deployment.

[0057] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any person skilled 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 according to the technical essence of the present application to the above-mentioned embodiments still belongs to the protection scope of the technical solution 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 a convex-concave-convex manner from inside to outside in 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 of the composite roof (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 groove (115) is arranged on the outer convex annular surface, and the driving mechanism (2) is mounted 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 The composite roof (1) includes six driving mechanisms (2) and six aluminum-plated flexible films (3), six circular arc grooves (115) for accommodating the aluminum-plated flexible films (3) in the folded state are arranged on the periphery of the lower end surface of the composite roof (1), and six mounting holes A (111) are arranged on the periphery of the lower end surface of the composite roof (1) at the mounting positions of the six driving mechanisms (2), and the six driving mechanisms (2) are mounted on the corresponding mounting holes A (111) on the periphery 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, The composite roof (1) includes twelve aluminum-plated flexible film unlocking assemblies (12), two aluminum-plated flexible film unlocking assemblies (12) are arranged for each aluminum-plated flexible film (3) to lock the aluminum-plated flexible film (3) and limit 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) by double-sided polyimide adhesive tape.

10. A method of operating a thermal and radiation shielded rollable and foldable mechanism according to any one of claims 1-9, characterized in that, The method includes the following steps: S1, initially, the aluminum-plated flexible film (3) is in a folded state, and the thin-walled elastic expansion rod (26) is in a wound state; S2, when the mechanism is to be opened, the upper computer sends a turn-on signal to the two-way remote control switch of the electric control module on the composite roof (1) in turn; S3, the power supply circuit of the electric heating end (122) of the aluminum-plated flexible film unlocking assembly (12) is turned on by the one-way remote control switch connected to the electric heating end (122), the electric heating end (122) is heated, the fixed rope (123) of the aluminum-plated flexible film unlocking assembly (12) is melted and broken by heat, and the aluminum-plated flexible film (3) is released; S4, the power supply circuit of the electric heating plate (244) of the unlocking assembly of the driving mechanism is turned on by the other one-way remote control switch connected to the electric heating plate (244), the electric heating plate (244) is heated, the locking rope (252) of the unlocking assembly of the driving mechanism is melted and broken by heat, and the thin-walled elastic expansion rod (26) is released; S5, at this time, the aluminum-plated flexible film (3) and the thin-walled elastic expansion rod (26) are both unrestrained, the thin-walled elastic expansion rod (26) automatically expands outward under the action of the elastic strain energy stored therein, drives the aluminum-plated flexible film (3) to deploy outward, and forms a protective tent in the shape of a multi-prism pyramid.

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