Extraterrestrial celestial body sample sealing, isolating and packaging device and method thereof

Abstract

The invention discloses an extraterrestrial celestial body sample sealing, isolating and packaging device and a method thereof. The device comprises a sealing tank body, a sealing upper cover, a sealing lower cover, a rubber ring, a memory alloy, an internal packaging container and the like. A sample is packaged in the internal packaging container, the internal packaging container is firstly isolated from dust through the plastic sleeve bag, after the internal packaging container enters the sealing tank body, the rubber ring is extruded to remove dust on the inner wall of the sealing tank body, the spring pin is compressed, and self-locking of the device is completed. The heating film attached to the surface of the memory alloy is heated, the memory alloy is recovered, the upper tip of the memory alloy is pressed into the indium-tin alloy on the side face of the cover body of the tank body, the indium-tin alloy is pre-welded to the front portions of the two lower tips, and brazing sealing is formed in gaps between the memory alloy and the side wall of the tank body through heat conduction of the memory alloy. And finally, a heating wire pre-installed on the lower surface of the sealing inner cover is heated, so that plastic welding sealing of the plastic cover and the plastic is completed. The composite sealing device is light in weight, the whole action process is simple, and a guiding device is reliable.

Description

Technical Field

[0001] The present invention belongs to an extraterrestrial body sampling and sealing device, and in particular relates to an extraterrestrial body sample sealing, isolation and packaging device and a method thereof. Background Art

[0002] As humans delve deeper into extraterrestrial research, the scientific instruments carried by the probes cannot meet people's needs for studying extraterrestrial objects. Therefore, it is necessary to bring extraterrestrial samples back to laboratories on Earth for in-depth analysis to study the origin of life and the celestial environment.

[0003] After my country successfully completed the return of lunar soil from Chang'e-5 in 2022, it plans to return samples from Mars and other planets. The Mars sampling mission mainly includes the formation and evolution of terrestrial planets. Mars is the fourth planet from the sun and records the history of the early evolution of the solar system; planetary habitability. Mars is a terrestrial planet adjacent to the Earth. By studying Mars, we can better understand the past, present and future development trends of the Earth; and extraterrestrial life detection.

[0004] According to relevant research, due to the location of Mars near the habitable zone of the solar system, there is a possibility of life on Mars, so the Mars sample return mission belongs to the V-class protection requirements. The higher protection requirements put forward certain requirements on the long-distance and long-term sealing capabilities of the sealing device. In terms of sealing to achieve biological isolation, two-way guarantees are required. First, the Earth environment cannot be directly brought into the Martian environment to pollute Mars; second, the Martian samples cannot be exposed in the Earth environment. That is, the sealed containers and other components related to the sample return mission should "break the contact chain" with the Martian environment.

[0005] For unmanned exploration sampling and return missions, it is necessary to use an automated method to test the sealing and sealing effect of samples. Existing planetary sampling sealing devices all use extrusion sealing, which can meet certain requirements for solid sealing and dust prevention. However, the airtightness during the return process is too small due to the small effective sealing area of ​​the extrusion seal, resulting in a high risk of leakage. At the same time, the driving mechanism for applying the sealing force attached to the extrusion seal is relatively complex, resulting in a larger mass of supporting facilities. Therefore, it is necessary to conduct special research on the isolation and packaging technology of samples on the surface of extraterrestrial planets. Summary of the invention

[0006] In order to solve the problems in the prior art, the present invention provides a sealed isolation packaging device for extraterrestrial body samples, comprising a sealed upper cover, a sealed lower cover, a sealed tank body and an internal packaging container;

[0007] The internal packaging container is used to package extraterrestrial samples. The external part of the internal packaging container is covered with a plastic film. The sealed lower cover limits the internal packaging container in the sealed tank body. A plurality of spring pin assemblies are evenly distributed in the circumferential direction inside the sealed upper cover. The spring pin assemblies are arranged along the radial direction of the sealed upper cover. Each spring pin assembly is provided with a pre-compression structure for limiting its movement. The sealed tank body is provided with a tapered hole fixing member for limiting the spring pin assembly. The sealed upper cover is locked with the sealed tank body through the spring pin assembly to limit the sealing lower cover and the internal packaging container.

[0008] The lower surface of the sealed upper cover is provided with a circle of annular protrusions, and a memory alloy is arranged in the annular space between the annular protrusions and the inner wall of the sealed tank body; an annular groove is arranged on the outer periphery of the upper surface of the sealed lower cover, and the bottom of the memory alloy is fixedly installed in the annular groove, and the memory alloy is composed of a main structure and three sections of tip structures arranged from top to bottom along the main structure, and each section of the tip structure is symmetrically arranged on the left and right sides of the main structure, and the annular protrusion and the sealed tank body are provided with grooves at the topmost tip structure positions on both sides of the corresponding memory alloy, and the grooves are pre-welded with compressed indium tin alloy; the tip positions of the two lowest sections of the tip structure of the memory alloy are pre-welded with brazed indium tin alloy, a polyimide heating film for heating the memory alloy is provided on the main structure of the memory alloy, and a film cable for energizing the polyimide heating film is encapsulated in the sealed upper cover; a rubber ring is installed on the outer wall of the sealed lower cover through a dovetail groove; a heating wire is installed at the bottom of the sealed lower cover and an electric heating wire cable is arranged to energize the heating wire, and a metal mesh is fixed below the heating wire.

[0009] Furthermore, a metal rubber buffer device and a plastic cover are arranged on the top of the internal packaging container in sequence from bottom to top, and the metal rubber buffer device is used to consume the energy caused by inertial impact of the internal packaging container; the plastic film is sleeved on the outside of the internal packaging container on the top of which the metal rubber buffer device and the plastic cover are arranged, and the plastic cover is welded to the plastic film; the sealed lower cover is connected to the plastic cover of the internal packaging container through a connecting spring.

[0010] Furthermore, the sealed tank body is fixed on the external returner, and a sleeve tooling is provided inside the orbiter cabin, and the sleeve tooling is used to install a sleeve spring to connect the sleeve sheet. The plastic film for bagging the internal packaging container is fixed on the sleeve sheet through an elastic ring, and the sleeve sheet is kept balanced by the force provided by the sleeve spring and the elastic ring.

[0011] The present invention also provides a packaging method according to the extraterrestrial body sample sealing isolation packaging device, comprising the following steps:

[0012] Before sealing, the sealing upper cover, the sealing lower cover, the memory alloy and the rubber ring are assembled first, and the metal mesh and the heating wire at the bottom of the sealing lower cover are also installed together. After all the assembling is completed, the sealing upper cover and the sealing lower cover are connected together to form a sealing cover assembly. The sealing cover assembly is connected to the plastic cover on the top of the internal packaging container through a connecting spring, and then the sealing cover assembly is connected to the internal packaging container;

[0013] During sealing, the driving device pushes the sealing cover assembly and the internal packaging container into the sealed tank body, after which the rubber ring is squeezed, and dust on the inner wall of the sealed tank body is removed during the downward movement of the internal packaging container. The sealing cover assembly moves downward until the spring pin pops out and inserts into the tapered hole fixing piece, completing the self-locking of the device;

[0014] The polyimide heating film heats the memory alloy, the memory alloy recovers its shape, the tip structure at the top of the memory alloy is pressed into the compressed indium tin alloy of the sealed tank body and the sealed upper cover, the memory alloy is sealed, and the brazing indium tin alloy pre-welded on the memory alloy is melted, thereby forming a brazing seal between the memory alloy and the sealed tank body and between the memory alloy and the sealed upper cover;

[0015] Finally, the heating wire pre-installed at the bottom of the sealed lower cover is heated by the heating wire cable, and the heat is conducted through the metal mesh, so that the plastic film performs plastic welding and sealing on the internal packaging container, and finally the sealing of the entire device is completed.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1) The present invention adopts a sealing method of extruding a memory alloy and cold welding an indium tin metal, thereby overcoming the large sealing force of the metal gasket sealing structure and utilizing the physical properties of the indium tin metal being relatively soft and capable of atomic bonding, so that the restoring force of the memory alloy can complete the extrusion seal, thereby achieving high sealing capability while reducing the electrical energy and sealing force requirements.

[0018] 2) The present invention adopts the sealing method of indium tin alloy brazing, thus overcoming the risk of gas leakage brought by the sealing structure using extrusion sealing and the problem that the sealing structure is easy to fail under impact load in the prior art, improving the airtightness performance of the device and providing a high-strength sealing interface. Thus, good airtightness is obtained while increasing the strength of the sealing interface, thereby improving the reliability of the device.

[0019] 3) The present invention adopts a built-in metal rubber buffer device to buffer the high impact caused by the return, thereby overcoming the insufficient buffering force brought by the use of rubber polymers in the prior art and the excessive volume brought by the long-distance single buffering of aluminum honeycombs, thereby achieving a better buffering effect while reducing the weight of the entire device.

[0020] 4) The present invention adopts a passive bagging method to carry out dust-proof treatment of the container and combines it with a heating device to weld the plastic, thereby overcoming the shortcomings of the active bagging packaging in the prior art, such as too many mechanism drive devices and excessive mass, and obtains better reliability of the passive method while reducing the weight of the entire device.

[0021] 5) The present invention adopts a redundant sealing method combining multiple sealing methods, thereby overcoming the shortcomings of the prior art such as excessive sealing force required for pure extrusion sealing and unreliable sealing structure, and achieving high sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a sectional stereogram of the overall structure of the present invention.

[0023] Figure 2 It is an enlarged cross-sectional view of the overall structure of the present invention.

[0024] Figure 3 This is the layout diagram of the device before bagging during the pushing process.

[0025] Figure 4 It is the layout diagram of the device after the internal packaging container enters the sealed tank body.

[0026] Figure 5 This is the sealing cover parts diagram.

[0027] Figure 6 This is the sealing lower cover parts diagram.

[0028] Figure 7 It is the assembly drawing of the sealed upper cover and lower cover.

[0029] Figure 8 This is an enlarged view of the heating wire cable routing (left) and an enlarged view of the film cable routing (right).

[0030] Fig. 9 It is an enlarged view of the tapered hole fixture and the pre-compression fixture.

[0031] Fig.10 This is the assembly diagram of the bagging device (left), and the state of the film after bagging is completed (right).

[0032] Fig.11 It is a diagram of the centering process of the sealing cover assembly and the sealing tank body.

[0033] In the figure, 1. sealed upper cover; 2. sealed lower cover; 3. sealed tank body; 4. internal packaging container; 5. metal rubber buffer device 6. hexagon socket screw; 7. spring; 8. spring pin; 9. memory alloy; 10. elastic ring; 11. plastic cover; 12. pre-compression wire screw sleeve; 13. pre-compression fixing piece; 14. tapered hole fixing piece; 15. tank body wire screw sleeve; 16. compressed indium tin alloy; 17. rubber ring; 18. plastic film; 19. metal mesh; 20. heating wire; 21. brazing indium tin alloy; 22. polyimide heating film; 23. connecting spring; 24. sleeve spring; 25. sleeve tooling; 26. sleeve sheet. DETAILED DESCRIPTION

[0034] The present invention is further described and illustrated below in conjunction with specific embodiments. The embodiments are merely exemplary of the present disclosure and do not define the scope of limitation. The technical features of each embodiment of the present invention may be combined accordingly without conflicting with each other.

[0035] The present invention designs a sealing and isolating device for extraterrestrial body samples, which cooperates with a variety of sealing methods to ensure the sealing effect, including rubber ring sealing, plastic welding sealing, soft metal extrusion sealing, and metal brazing sealing. The single rubber ring sealing requires a smaller sealing force and does not require a separate driving device. The soft metal extrusion sealing and brazing sealing are optimized in position, and the heat conduction of the memory alloy is utilized to make full use of the heat. The soft metal extrusion sealing and the brazing sealing are completed successively, and the heat utilization efficiency is improved. The passive bagging structure is simple and the reliability is high. It can prevent the dust on the surface of the container from affecting the sealing structure to a certain extent. The plastic welding seal can further ensure the airtightness of the container. The weld area formed by brazing is larger than the contact area of ​​the extrusion seal, and the sealing reliability is higher. At the same time, under the buffering effect of the metal rubber, the weld can provide a better strength sealing interface.

[0036] This example provides a sealed isolation packaging device for extraterrestrial samples, such as Figure 1 As shown, the device mainly includes a sealed upper cover 1, a sealed lower cover 2 and a sealed tank body 3. The sealed tank body 3 is installed in the returner of the extraterrestrial probe. The extraterrestrial probe captures the internal packaging container 4 through the capture transfer mechanism on the detection orbit of the celestial body, and pushes the internal packaging container 4 into the sealed tank body 3 for sealing and packaging through the push rod of the pushing mechanism. The soft metal extrusion seal is completed by the memory alloy 9 in conjunction with the pressurized indium tin alloy 16, the rubber ring 17 completes the dust removal and rubber ring sealing, the tip structure of the memory alloy 9 cooperates with the sealed tank body 3 and the brazed indium tin alloy 21 to complete the brazing seal, the internal plastic film 18 cooperates with the plastic cover 11 to complete the plastic welding seal, and multiple sealing methods are compositely sealed to improve the isolation level. The structural details of the device are shown in FIG. Figure 2 shown.

[0037] The sealed tank body 3 is in the shape of a thin-walled cylinder, and the bottom of the container is sealed. The internal packaging container 4 containing the sample is first bagged by the sleeve sheet 26, and then the bagged internal packaging container 4 enters the sealed tank body 3 through the top. The sealed tank body 3 is processed by non-ferrous metals such as magnesium alloy or aluminum alloy. Due to the self-locking structure of the spring pin 8, considering the processing performance, the side wall of the sealed tank body 3 uses a wire screw sleeve to add a tapered hole fixing member 14 to limit the spring pin 8. The internal packaging container 4 is in the shape of a capsule, and the tapered hole fixing member 14 is a rotating body as a whole, and the outer surface is a two-stage stepped shaft shape. The installation position of the tapered hole fixing member 14 is positioned by a step (shaft shoulder), and the interior of the tapered hole fixing member 14 is a tapered hole structure. The inner and outer surfaces of the sealed tank body 3 are both oxidized and nickel-plated to ensure the long-term performance of the parts, and the inner wall surface of the rubber ring 17 in contact with the movement is coated with polytetrafluoroethylene to reduce friction.

[0038] In a specific embodiment of the present invention, the spring pin assembly is composed of a spring 7 and a spring pin 8, and the pre-compression structure is composed of a pre-compression fixing piece 13 and a pre-compression wire screw sleeve 12, and the pre-compression fixing piece 13 is installed through the pre-compression wire screw sleeve 12; the pre-compression structure limits the movement of the spring pin 8 through the pre-compression fixing piece 13, thereby pre-compressing the spring 7; the outer side of the pre-compression fixing piece 13 is cylindrical, and the inner side is divided into two sections, including a cylindrical section that limits the linear motion of the spring pin 8, and a tapered hole section that pre-compresses the spring pin 8, and the cylindrical section is close to the spring pin 8; a plurality of screw countersunk holes are also evenly arranged circumferentially on the sealing upper cover 1, and the sealing upper cover 1 is connected to the sealing lower cover 2 by screws; the number of the blind holes and the screw countersunk holes is greater than 3.

[0039] In a specific embodiment of the present invention, the material of the memory alloy 9 is a single-stroke nickel-titanium alloy to prevent the large-scale temperature alternation from causing the memory alloy to deform again, thereby affecting the sealing effect; the annular groove and the sealing tank body 3 are pre-welded with a pressurized indium-tin alloy 16 through the grooves on both sides of the corresponding memory alloy 9, and a polyimide heating film 22 for heating the memory alloy 9 is provided on the main structure above the tip structure at the top end of the memory alloy 9. The polyimide heating film 22 heats the memory alloy 9 to restore the shape of the memory alloy 9. At the same time, the tip structure at the top end of the memory alloy 9 cuts into the pressurized indium-tin alloy 16 in the grooves on both sides, and the brazed indium-tin alloy 21 pre-welded on the memory alloy 9 melts, so that the memory alloy 9 forms a seal with the sealing tank body 3 and the sealing upper cover 1; the film cable is controlled by an external temperature control device and a power supply.

[0040] In a specific embodiment of the present invention, the heating wire 20 is embedded in the sealed lower cover 2, and polytetrafluoroethylene is coated in the recess where the heating wire 20 is embedded, so that the heating wire 20 and the sealed lower cover 2 are insulated from each other.

[0041] In a specific embodiment of the present invention, the tapered hole fixing part 14 is installed through the tank wire screw sleeve 15. The tapered hole fixing part 14 is an axisymmetric structure as a whole, and the outer surface is a stepped shaft shape. The installation position of the tapered hole fixing part 14 is positioned by the shaft shoulder. The interior of the tapered hole fixing part 14 is a tapered hole structure, and the spring pin 8 is limited by the tapered hole structure.

[0042] In a specific embodiment of the present invention, the sealing upper cover 1, the sealing lower cover 2 and the sealing tank body 3 are made of magnesium alloy or aluminum alloy to reduce the overall mass of the device. The sealing upper cover 1, the sealing lower cover 2 and the sealing tank body 3 are arranged concentrically; the inner and outer surfaces of the sealing tank body 3 are both oxidized and nickel-plated to prevent corrosion of the parts during the service life, thereby ensuring the surface matching accuracy of the parts; the inner wall surface of the sealing tank body 3 that the rubber ring 17 contacts in motion is coated with polytetrafluoroethylene to reduce the friction force during the pressing process of the rubber ring 17; the rubber ring 17 is used in the device Dust is removed during the sealing process to prevent leakage gaps caused by dust on the inner wall of the sealed tank body 3 during the subsequent extrusion process of the memory alloy 9. At the same time, the rubber ring 17 can provide a good airtight seal. The rubber ring 17 adopts an O-ring with a wire diameter of 1mm to 2.65mm, and the material of the rubber ring 17 is low-phenyl silicone rubber; a metal rubber buffer device 5 is also installed at the bottom of the sealed tank body 3, and the metal rubber buffer device 5 is used to consume the energy caused by the inertial impact of the internal packaging container 4; the pre-compression fixing part 13 and the tapered hole fixing part 14 are made of titanium alloy and stainless steel.

[0043] The sealing cover 1 is in the shape of a cover, such as Figure 5 As shown, the top surface is a plane, and the lower end is a thin-walled circular ring structure. The sealing cover 1 is made of magnesium alloy or aluminum alloy. In order to achieve lightweight design, the sealing cover 1 integrates the spring pin self-locking structure into the top reinforcing rib. As with the sealing tank body 3, considering the processing performance, the side wall of the sealing cover 1 uses a wire screw sleeve to add a pre-compression fixing member 13 to pre-compress the spring 7, such as Fig. 9 As shown, the outer side of the pre-compression fixing member 13 is a cylinder, and the inner side is divided into two sections, including a cylindrical section that limits the linear motion of the spring pin 8, and a tapered hole section that pre-compresses the spring pin 8. Three spring pins 8 are evenly distributed on the top circumference for self-locking, and the sealing upper cover 1 is also evenly provided with three screw countersunk holes in the circumference, through which the sealing lower cover 2 is connected.

[0044] The sealing lower cover 2 is in the shape of a disc, such as Figure 6As shown, the top is a plane, the lower surface is a spherical surface, and the sealing lower cover 2 is processed using a magnesium alloy or an aluminum alloy. At the same time, the upper part of the sealing lower cover 2 is provided with a memory alloy 9 through a groove, and the sealing lower cover 2 is also provided with a screw countersunk hole at the position of the screw countersunk hole of the sealing upper cover 1. The sealing lower cover 2 is fixed to the sealing upper cover 1 through the hexagon socket screw 6. The sealing upper cover 1 and the sealing lower cover 2 are matched through the outer circumferential surface of the thin-walled circular ring of the sealing upper cover 1 and the inner circumferential surface of the sealing lower cover 2 to ensure the concentric installation accuracy, as shown in FIG. Figure 7 The lower part of the circumferential surface of the sealing lower cover 2 is provided with a dovetail groove for mounting a rubber ring 17; a groove is provided on the lower surface of the sealing lower cover 2, and the side wall of the groove is coated with polytetrafluoroethylene to insulate the heating wire 20 and the sealing lower cover 2, and a copper metal mesh 19 is fixed on the inner wall by welding on the heating wire 20, and the metal mesh 19 is used for uniform heat conduction to prevent the damage of the plastic film caused by heat concentration.

[0045] The ground assembly process is: pre-weld the memory alloy 9 and the rubber ring 17 of the brazed indium tin alloy 21 and install them on the sealing lower cover 2, then fix the sealing upper cover 1 and the sealing lower cover 2 by the hexagon socket screw 6, and finally install the spring pin self-locking structure in the order of spring 7, spring pin 8, pre-compression wire screw sleeve 12, and pre-compression fixing part 13. At this time, the conical surface of the spring pin 8 is in contact with the conical surface of the pre-compression fixing part 13, and the spring has a certain pre-tightening force to ensure the stability of the spring pin self-locking structure.

[0046] The heating wire 20 is installed in the groove coated with polytetrafluoroethylene in the sealing lower cover 2, and the metal mesh 19 is fixed to the lower surface of the sealing lower cover 2 with a certain tensile force by welding. The heating wire cable is led out through the reserved interface of the sealing lower cover 2, such as Figure 8 The sealed upper cover 1 also contains a thin film cable, such as Figure 8 As shown in the right figure of , the film cable energizes the polyimide heating film 22, thereby heating the memory alloy 9, and the film cable is controlled by an external temperature control device and a power supply.

[0047] The sleeve fixture 25 is fixed on the wall of the orbiter cabin, and the sleeve spring 24 stretches the sleeve sheet 26 with a small stretching amount. The four sleeve sheets 26 are constrained by the elastic ring 10 that fixes the plastic film 18. Thus, the fixing work of the cabin mechanism is completed. Figure 3 shown.

[0048] The sealing cover assembly and the plastic cover 11 as well as the metal rubber buffer device 5 and the plastic cover 11 on the top of the internal packaging container 4 are assembled. The sealing cover assembly and the plastic cover 11 are connected by a connecting spring 23, and the connecting spring 23 plays a certain connecting role.

[0049] Before sealing, the internal packaging container 4 is captured and adjusted by the capture transfer mechanism provided externally, and the internal packaging container 4 is adjusted to the axis of the device, while limiting its axial movement, such as Figure 3 shown.

[0050] During sealing, the pushing mechanism (driving device) pushes the inner packaging container 4 through the sleeve sheet 26 for bagging to prevent certain dust from entering the subsequent device. The bottom of the inner packaging container 4 pushes the plastic film 18 away from the sleeve sheet 26. When the elastic ring 10 leaves the sleeve sheet 26, the sleeve sheet 25 pops outwards through the stretching action of the sleeve spring 24 to prevent the subsequent movement interference of the sealing cover assembly; the elastic ring 10 is separated from the sleeve sheet 26, so it shrinks inwards, thereby driving the plastic film 18 to press onto the plastic cover 11, as shown in FIG. Fig.10 shown.

[0051] The sealing cover assembly is driven by the driving device to move downward into the sealed tank body 3. During the movement, the top surface of the capsule ball at the bottom of the internal packaging container 4 and the inner conical surface at the top of the sealed tank body 3 are first contacted to adjust the axis of the internal packaging container 4, and then the chamfer of the lower end surface of the sealing lower cover 2 and the inner conical surface at the top of the sealed tank body 3 are used to ensure that the centers of the entire sealing cover assembly, the internal packaging container 4 and the sealed tank body 3 are on the same axis. Fig.11 The driving device continues to push, pushing the internal packaging container 4 into the sealed tank body 3, and then the rubber ring 17 is squeezed, and the dust on the inner wall of the sealed tank body 3 is removed during the downward movement, and the spring pin 8 moves into the pin hole through the inner cone surface at the top of the sealed tank body 3 to compress the spring 7, and the sealing upper cover 1 and the sealing lower cover 2 move downward until the spring pin 8 pops out and inserts into the cone hole fixing piece 14 to complete the self-locking of the device, as shown in FIG. Figure 4 shown.

[0052] After that, the memory alloy 9 is heated by the polyimide heating film 22, and the memory alloy 9 gradually recovers its shape. The top tip structure of the memory alloy 9 squeezes into the reserved compressed indium tin alloy 16 in the groove of the sealed tank body 3 and the sealed upper cover 1. The thin-walled blades on the inner and outer sides of the tip structures of the two lowest sections of the memory alloy 9 cut into the sealed upper cover 1 and the sealed tank body 3 respectively. At this time, as the temperature rises, the brazing indium tin alloy 21 at the tip position of the tip structure of the two lowest sections of the memory alloy 9 gradually melts, flows to the junction of the memory alloy 9 and the sealed tank body 3 through the action of surface tension, and forms a brazing seal after cooling. The melting point of the brazed indium tin alloy 21 to be welded should match the deformation temperature of the memory alloy 9. The temperature ranges of the two are close to a certain extent. By adjusting the material parameters, it is ensured that the brazing indium tin alloy 21 can melt while the memory alloy 9 is deformed, and the brazing is completed. The welding surface is pre-plated with nickel and gold before welding the brazing indium tin alloy 21 to ensure the welding strength.

[0053] Then, the controller controls the heating wire 20 to generate heat, and the heat is conducted to the plastic film 18 through the metal mesh 19, thereby completing the plastic fusion welding and sealing operation.

[0054] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. For ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A sealed isolation packaging device for extraterrestrial body samples, characterized in that: It comprises a sealed upper cover (1), a sealed lower cover (2), a sealed tank body (3) and an internal packaging container (4); The internal packaging container (4) is used to package an extraterrestrial body sample. The external part of the internal packaging container (4) is covered with a plastic film (18). The sealed lower cover (2) limits the internal packaging container (4) in the sealed tank body (3). A plurality of spring pin assemblies are evenly distributed in the circumferential direction inside the sealed upper cover (1). The spring pin assemblies are arranged along the radial direction of the sealed upper cover (1). Each spring pin assembly is provided with a pre-compression structure for limiting its movement. The sealed tank body (3) is provided with a tapered hole fixing member (14) for limiting the position of the spring pin assemblies. The sealed upper cover (1) is locked with the sealed tank body (3) through the spring pin assemblies to limit the position of the sealed lower cover (2) and the internal packaging container (4). The lower surface of the sealing upper cover (1) is provided with a circle of annular protrusions, and a memory alloy (9) is arranged in the annular space between the annular protrusions and the inner wall of the sealing tank body (3); an annular groove is arranged on the outer periphery of the upper surface of the sealing lower cover (2), and the bottom of the memory alloy (9) is fixedly installed in the annular groove. The memory alloy (9) is composed of a main structure and three sections of tip structures arranged from top to bottom along the main structure, and each section of the tip structure is symmetrically arranged on the left and right sides of the main structure. The annular protrusion and the sealing tank body (3) are both provided with grooves at the positions of the tip structures at the top ends of the two sides of the memory alloy (9), and the grooves are pre-welded with pressurized indium tin alloy (16); the tips of the two lowest tip structures of the memory alloy (9) are pre-welded with brazed indium tin alloy (21); a polyimide heating film (22) for heating the memory alloy (9) is provided on the main structure of the memory alloy (9); a film cable for energizing the polyimide heating film (22) is encapsulated in the sealed upper cover (1); a rubber ring (17) is installed on the outer wall of the sealed lower cover (2) through a dovetail groove; a heating wire (20) is installed at the bottom of the sealed lower cover (2) and an electric heating wire cable is arranged to energize the heating wire (20); a metal mesh (19) is fixed below the heating wire (20).

2. The sealing, isolating and packaging device for extraterrestrial body samples according to claim 1, characterized in that: The top of the internal packaging container (4) is sequentially arranged with a metal rubber buffer device (5) and a plastic cover (11) from bottom to top, and the metal rubber buffer device (5) is used to consume the energy caused by the inertial impact of the internal packaging container (4); the plastic film (18) is sleeved on the outside of the internal packaging container (4) on which the metal rubber buffer device (5) and the plastic cover (11) are arranged on the top, and the plastic cover (11) is welded to the plastic film (18); the sealing lower cover (2) is connected to the plastic cover (11) of the internal packaging container (4) through a connecting spring (23).

3. The sealing, isolating and packaging device for extraterrestrial body samples according to claim 1, characterized in that: The spring pin assembly is composed of a spring (7) and a spring pin (8); the pre-compression structure is composed of a pre-compression fixing piece (13) and a pre-compression wire screw sleeve (12); the pre-compression fixing piece (13) is installed through the pre-compression wire screw sleeve (12); the pre-compression structure limits the movement of the spring pin (8) through the pre-compression fixing piece (13), thereby playing a pre-compression role on the spring (7); the outer side of the pre-compression fixing piece (13) is cylindrical, and the inner side is divided into two sections, including a cylindrical section that limits the linear movement of the spring pin (8) and a tapered hole section that pre-compresses the spring pin (8), and the cylindrical section is close to the spring pin (8); a plurality of screw countersunk holes are also uniformly arranged on the sealing upper cover (1) in the circumferential direction, and the sealing upper cover (1) is connected to the sealing lower cover (2) through screws; the number of the blind holes and the screw countersunk holes is greater than 3.

4. The sealing, isolating and packaging device for extraterrestrial body samples according to claim 3, characterized in that: The material of the memory alloy (9) is a single-stroke nickel-titanium alloy to prevent the memory alloy (9) from deforming again due to a large range of temperature changes, thereby affecting the sealing effect; the polyimide heating film (22) heats the memory alloy (9) to restore the shape of the memory alloy (9), and at the same time, the tip structure at the top of the memory alloy (9) cuts into the compressed indium tin alloy (16) in the grooves on both sides, and the brazing indium tin alloy (21) pre-welded on the memory alloy (9) melts, so that the memory alloy (9) forms a seal with the sealed tank body (3) and the sealed upper cover (1); the film cable is controlled by an external temperature control device and a power supply.

5. The extraterrestrial body sealing isolation packaging device according to claim 3, characterized in that: The heating wire (20) is embedded in the sealed lower cover (2), and polytetrafluoroethylene is coated in the recess in which the heating wire (20) is embedded, so that the heating wire (20) and the sealed lower cover (2) are insulated from each other.

6. The sealing, isolating and packaging device for extraterrestrial body samples according to claim 3, characterized in that: The tapered hole fixing part (14) is installed through the tank body wire screw sleeve (15); the tapered hole fixing part (14) is an axisymmetric structure as a whole, and the outer surface is in the shape of a stepped shaft. The installation position of the tapered hole fixing part (14) is positioned through the shaft shoulder; the interior of the tapered hole fixing part (14) is a tapered hole structure, and the spring pin (8) is limited by the tapered hole structure.

7. The sealing, isolating and packaging device for extraterrestrial body samples according to claim 4, characterized in that: The sealing upper cover (1), the sealing lower cover (2) and the sealing tank body (3) are made of magnesium alloy or aluminum alloy to reduce the overall mass of the device. The sealing upper cover (1), the sealing lower cover (2) and the sealing tank body (3) are arranged concentrically. The inner and outer surfaces of the sealing tank body (3) are both oxidized and nickel-plated to prevent corrosion of the parts during their service life, thereby ensuring the surface matching accuracy of the parts. The inner wall surface of the sealing tank body (3) that the rubber ring (17) contacts in motion is coated with polytetrafluoroethylene to reduce the friction force during the pressing process of the rubber ring (17). ; The rubber ring (17) is used to remove dust during the sealing process of the device to prevent the subsequent memory alloy (9) from being affected by the dust on the inner wall of the sealed tank body (3) during the extrusion process and leaking gaps. At the same time, the rubber ring (17) can provide a good airtight seal; a metal rubber buffer device (5) is also installed at the bottom of the sealed tank body (3), and the metal rubber buffer device (5) is used to consume the energy caused by the inertial impact of the internal packaging container (4); the pre-compression fixing member (13) and the tapered hole fixing member (14) are made of titanium alloy or stainless steel.

8. The sealing, isolating and packaging device for extraterrestrial body samples according to claim 7, characterized in that: The sealed tank body (3) is fixed on the external returner, and a sleeve fixture (25) is provided inside the orbiter cabin. The sleeve fixture (25) is used to install a sleeve spring (24) to connect a sleeve sheet (26). The plastic film (18) for bagging the internal packaging container (4) is fixed on the sleeve sheet (26) through an elastic ring (10), and the sleeve sheet (26) is kept balanced by the forces provided by the sleeve spring (24) and the elastic ring (10).

9. The sealing, isolating and packaging device for extraterrestrial body samples according to claim 6, characterized in that: The rubber ring (17) is an O-ring with a wire diameter of 1 mm to 2.65 mm, and the material of the rubber ring (17) is low-phenyl silicone rubber.

10. A packaging method for the sealed isolation packaging device for extraterrestrial body samples according to claim 2, characterized in that: The following steps are involved: Before sealing, the sealing upper cover (1), the sealing lower cover (2), the memory alloy (9) and the rubber ring (17) are assembled, and the metal mesh (19) and the heating wire (20) at the bottom of the sealing lower cover (2) are also installed. After all the assembling is completed, the sealing upper cover (1) and the sealing lower cover (2) are connected together to form a sealing cover assembly. The sealing cover assembly is connected to the plastic cover (11) at the top of the internal packaging container (4) through a connecting spring (23), and then the sealing cover assembly is connected to the internal packaging container (4); When sealing, the driving device pushes the sealing cover assembly and the internal packaging container (4) into the sealed tank body (3), after which the rubber ring (17) is squeezed, and dust on the inner wall of the sealed tank body (3) is removed during the downward movement of the internal packaging container (4). The sealing cover assembly moves downward until the spring pin (8) pops out and inserts into the tapered hole fixing member (14), completing the self-locking of the device. The polyimide heating film (22) heats the memory alloy (9), the memory alloy (9) recovers its shape, the tip structure at the top of the memory alloy (9) is pressed into the pressurized indium tin alloy (16) of the sealed tank body (3) and the sealed upper cover (1), the memory alloy is sealed, and the brazing indium tin alloy (21) pre-welded on the memory alloy (9) is melted, thereby forming a brazing seal between the memory alloy (9) and the sealed tank body (3) and between the memory alloy (9) and the sealed upper cover (1); Finally, the heating wire (20) pre-installed at the bottom of the sealed lower cover (2) is heated by the heating wire cable, and the heat is conducted through the metal mesh (19), so that the plastic film (18) performs plastic welding and sealing on the internal packaging container (4), and finally the sealing of the entire device is completed.

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