Suction Sheet for In-situ Micro-quantitative Sampling and Encapsulation of Rotary-cut Lunar Soil Samples

Abstract

The present invention discloses an absorption sheet for in-situ micro-quantitative sampling and encapsulation of rotary-cut lunar soil samples, which relates to the field of aerospace technology and solves the problem that existing in-situ sampling detection devices cannot accurately control the sampling volume and particle size distribution. It includes a rotary cutting sheet and a constant volume pressing cover. The constant volume pressing cover is installed on the rotary cutting sheet to form a sample storage cavity, realizing the constant volume collection of lunar soil; by controlling the size of the sample injection part, the collection of lunar soil within a specific particle size range is realized; the bottom of the rotary cutting sheet continuously applies a filling pressure to the lunar soil, realizing the constant density collection of lunar soil. The present invention can accurately control the sampling volume and particle size distribution of lunar soil, and at the same time can exclude the influence of large particle lunar soil on the sampling process, facilitating subsequent thermal volatile matter extraction and analysis.

Description

Technical Field

[0001] The present invention relates to the field of aerospace technology, and particularly to an absorbing sheet for in-situ micro-quantitative sampling and encapsulation of rotary cutting lunar soil samples. Background Technique

[0002] Deep space exploration refers to the exploration activities carried out by humans on the moon and more distant celestial bodies or space environments. As an important direction of human space activities and an important way of space science and technology innovation, it is one of the development priorities in the current and future space fields. Deep space exploration is not only a reflection of a country's scientific and technological level, but also a reflection of its comprehensive national strength.

[0003] At present, the main target of human deep space exploration is the only natural satellite of the earth: the moon. The lunar soil composition on the lunar surface is an important research direction in lunar exploration. At present, there are three mainstream detection methods: remote sensing detection, sampling return analysis and in-situ sampling detection. Compared with the problems of pollution prevention and control of returned objects and high engineering costs encountered in sampling return analysis, the in-situ detection method of lunar soil substances has more advantages. The in-situ sampling detection device is generally carried on intelligent equipment such as landers and rovers that land on the moon, and uses sampling tools to obtain surface or subsurface lunar soil samples, which are then transmitted to analytical instruments for on-site analysis. However, the existing in-situ sampling detection devices generally adopt the methods of drilling and coring and surface shoveling. This sampling method cannot accurately control the sampling volume and particle size distribution of the samples. Therefore, there is an urgent need to propose a device that can collect samples with a fixed volume and fixed particle size. Summary of the Invention

[0004] In order to better complete the task of lunar soil sample collection and volatile detection, and solve the problem that the existing in-situ sampling detection device cannot accurately control the sampling volume and particle size distribution of the samples, the present invention hereby proposes an absorbing sheet for in-situ micro-quantitative sampling and encapsulation of rotary cutting lunar soil samples. The present invention can accurately control the sampling volume and particle size distribution of lunar soil, and at the same time can exclude the influence of large particles of lunar soil on the sampling process, which is convenient for subsequent thermal volatilization extraction and analysis.

[0005] The present invention proposes an in-situ micro-quantitative sampling device with a fixed particle size, fixed volume and fixed density for lunar soil volatile detection, which specifically includes a rotary cutting sheet and a constant volume pressing cover. The constant volume pressing cover is installed on the rotary cutting sheet to form a sample storage cavity to achieve constant volume collection of lunar soil; by controlling the size of the sample injection part, the collection of lunar soil within a specific particle size range is achieved; the bottom of the rotary cutting sheet continuously applies a filling pressure to the lunar soil to achieve constant density collection of the lunar soil;

[0006] The rotary cutting slice includes a rotary cutting slice body, a plurality of cutting edges and a plurality of sample inlet channels. A plurality of sample inlet channels are provided at the bottom of the rotary cutting slice body, and cutting edges are machined at the inlet ends of the sample inlet channels. The cutting edges generate a filling pressure under the rotary cutting action and interact with the compacted lunar soil. The lunar soil sample enters the sample receiving cavity through the sample inlet channels under the action of the bottom rotary cutting force and gradually fills the cavity.

[0007] Furthermore, the rotary cutting slice further includes a first annular groove, and the first annular groove and the constant volume pressing cover cooperate to form a sample receiving cavity.

[0008] Furthermore, the constant volume pressing cover is provided with a second annular groove, and the second annular groove is opposite to and buckled together with the first annular groove.

[0009] Furthermore, the sample inlet channels are communicated with the second annular groove through a plurality of communication holes opened on the rotary cutting slice.

[0010] Furthermore, the communication holes are oval holes.

[0011] Furthermore, the rotary cutting slice further includes a plurality of limiting blocks and a plurality of limiting grooves. The limiting blocks and the limiting grooves are arranged inside the rotary cutting slice body. The limiting blocks cooperate with the sampling device, and the limiting grooves cooperate with the sampling device to fix the absorption slice.

[0012] Furthermore, the limiting grooves are wedge-shaped grooves.

[0013] Furthermore, a plurality of pressing cover fixing pieces are also arranged on the rotary cutting slice, and the pressing cover fixing pieces fix the constant volume pressing cover.

[0014] Furthermore, the pressing cover fixing pieces are circumferentially distributed evenly on the rotary cutting slice.

[0015] Furthermore, the materials of the rotary cutting slice and the constant volume pressing cover are tantalum tungsten alloy.

[0016] The beneficial effects of the absorption slice for in-situ micro-quantitative sampling and encapsulation of rotary cutting lunar soil samples of the present invention are as follows:

[0017] (1) The absorption slice for in-situ micro-quantitative sampling and encapsulation of rotary cutting lunar soil samples of the present invention can accurately control the sampling amount and particle size distribution of lunar soil, and at the same time can exclude the influence of large particle lunar soil on the sampling process, realizing accurate control of the sampling amount and particle size distribution, which is convenient for subsequent extraction and analysis of volatile components.

[0018] (2) The absorption slice for in-situ micro-quantitative sampling and encapsulation of rotary cutting lunar soil samples of the present invention realizes micro-sampling of lunar soil by controlling the overall size of the absorption slice.

[0019] (3) The absorbent sheet for in-situ micro-quantitative sampling and encapsulation of rotary cutting type lunar soil samples according to the present invention realizes the collection of lunar soil within a specific particle size range by defining the diameter of the sampling channel, limits the specific surface area range of the lunar soil, further quantifies the volatile components generated by heating the lunar soil, reduces the uncertainty of the lunar soil, and realizes the collection of a fixed particle size;

[0020] (4) The absorbent sheet for in-situ micro-quantitative sampling and encapsulation of rotary cutting type lunar soil samples according to the present invention realizes the determination of the volume of the cavity by the envelope of the constant volume gland and the rotary cutting piece, which can ensure low-dispersion quantitative sampling for lunar soil under unknown working conditions, accurately control the sampling amount of the lunar soil, and realize the collection of a fixed volume;

[0021] (5) The absorbent sheet for in-situ micro-quantitative sampling and encapsulation of rotary cutting type lunar soil samples according to the present invention, during the sampling process, through cooperation with the sampling device, a filling pressure is continuously present at the bottom of the absorbent sheet, ensuring that the density of the lunar soil sample in the absorbent sheet cavity is higher than that of the original lunar soil. Therefore, on the premise of ensuring a fixed volume, quantitative sampling can be realized, and the collection of a fixed density can be realized;

[0022] (6) The absorbent sheet for in-situ micro-quantitative sampling and encapsulation of rotary cutting type lunar soil samples according to the present invention selects tantalum tungsten alloy as the material for making the absorbent sheet, enabling the absorbent sheet to withstand extreme low-temperature sampling environments and high-temperature and high-vacuum heating environments, ensuring the smooth collection of samples and not affecting the heating process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0024] In the drawings:

[0025] Figure 1 is the overall structural schematic diagram of the absorbent sheet for in-situ micro-quantitative sampling and encapsulation of rotary cutting type lunar soil samples according to the present invention;

[0026] Figure 2 is the cross-sectional structural schematic diagram of the absorbent sheet for in-situ micro-quantitative sampling and encapsulation of rotary cutting type lunar soil samples according to the present invention;

[0027] Figure 3 is the structural schematic diagram of the rotary cutting piece of the absorbent sheet for in-situ micro-quantitative sampling and encapsulation of rotary cutting type lunar soil samples according to the present invention;

[0028] Figure 4 is the structural schematic diagram of the bottom of the rotary cutting piece of the absorbent sheet for in-situ micro-quantitative sampling and encapsulation of rotary cutting type lunar soil samples according to the present invention;

[0029] Figure 5Schematic diagram of the constant - volume capping structure of the absorption sheet for in - situ micro - quantity and quantitative sampling and encapsulation of rotary - cut lunar soil samples according to the present invention;

[0030] Wherein: 1 - Rotary cutting piece, 11 - First annular groove, 12 - Cutting edge, 13 - Sampling channel, 14 - Limit block, 15 - Limit card slot, 16 - Communication hole, 17 - Capping fixing piece, 2 - Constant - volume capping, 21 - Second annular groove. Specific implementation mode

[0031] The following further elaborates on the specific implementation mode of the present invention in conjunction with the accompanying drawings:

[0032] Specific implementation mode one: Refer to Figures 1-5 This implementation mode is described. An absorption sheet for in - situ micro - quantity and quantitative sampling and encapsulation of rotary - cut lunar soil samples according to this implementation mode specifically includes a rotary cutting piece 1 and a constant - volume capping 2. The constant - volume capping 2 is installed on the rotary cutting piece 1 to form a sample storage cavity, realizing the constant - volume collection of lunar soil; by controlling the size of the sampling part, the collection of lunar soil within a specific particle size range is realized; the bottom of the rotary cutting piece 1 continuously applies a filling pressure to the lunar soil, realizing the dense collection of lunar soil;

[0033] The rotary cutting piece 1 includes a rotary cutting piece body, a plurality of cutting edges 12 and a plurality of sampling channels 13. A plurality of sampling channels 13 are arranged at the bottom of the rotary cutting piece body. The inlet end of the sampling channel 13 is processed with a cutting edge 12. The cutting edge 12 generates a filling pressure under the rotary cutting action, which can realize the cutting of lunar soil. Interacting with the compacted lunar soil, the cut - and - damaged lunar soil is transported along the rake face of the cutting edge 12 into the sample storage cavity of the absorption sheet through the sampling channel 13 under the action of the bottom rotary cutting force and gradually fills the cavity.

[0034] The rotary cutting piece 1 further includes a first annular groove 11, and the first annular groove 11 cooperates with the constant - volume capping 2 to form a sample storage cavity.

[0035] The constant - volume capping 2 is provided with a second annular groove 21. The second annular groove 21 is opposite to and buckled together with the first annular groove 11. When the lunar soil in the cavity reaches a dense state, the constant - volume capping 2 continuously applies pressure to the lunar soil sample in the sample cavity, so that the internal filling confining pressure of the sample is not less than 10 kPa, preventing the sample from shaking in position under the influence of external factors such as gravity and vibration. The constant - volume capping 2 applies pressure to the lunar soil sample in the sampling channel 13, forming a force - chain effect inside the sample to make the sample state stable..

[0036] The sampling channel 13 is communicated with the second annular groove 21 through a plurality of communication holes 16 opened on the rotary cutting piece 1, and the communication holes 16 are oval holes.

[0037] The rotary slicing piece 1 further includes a plurality of limiting blocks 14 and a plurality of limiting card slots 15. The limiting blocks 14 and the limiting card slots 15 are arranged on the inner side of the rotary slicing piece body. The limiting blocks 14 cooperate with the sampling device to drive the absorption piece to rotate for sampling, and the absorption piece slides through the cooperation of the limiting blocks 14 and the sampling device. The limiting card slots 15 cooperate with the sampling device to fix the absorption piece, and the limiting card slots 15 are wedge-shaped card slots.

[0038] A plurality of gland fixing pieces 17 are further arranged on the rotary slicing piece 1. The gland fixing pieces 17 fix the constant volume gland 2. After the constant volume gland 2 is installed on the rotary slicing piece 1, the constant volume gland 2 is fixed by bending a plurality of gland fixing pieces 17 inward. At the same time, the gland fixing pieces 16 are evenly distributed in a circumferential direction on the rotary slicing piece 1.

[0039] The inner diameter of the absorption piece is 14 mm, the outer diameter of the absorption piece is 21 mm, the width of the absorption cavity of the absorption piece is 2 mm, the height of the absorption cavity of the absorption piece is 1.6 mm, and the volume of the sampling cavity of the absorption piece is about 120 mm 3 , realizing the micro-sampling of lunar soil.

[0040] After the absorption piece has sampled the lunar soil, it will be transferred to a sealed heating furnace for heating to release the gas in the lunar soil. By analyzing the gas components, the composition of the lunar soil can be studied. During the heating process, it is necessary to ensure that the material of the absorption piece will not affect the heating process. The following considerations are made in this regard:

[0041] In order to ensure that the absorption piece can withstand the extreme low-temperature sampling environment and the high-temperature and high-vacuum heating environment, a comprehensive consideration of heat, force, chemistry, electricity, magnetism, etc. is carried out on the material of the absorption piece. Ensure low outgassing under high-temperature and high-vacuum conditions. At the same time, considering the actual working air pressure and temperature on the planet's surface, it is necessary to verify the saturated vapor pressure of the material to ensure that the material of the absorption piece does not produce interfering gases after being heated to a high temperature. The saturated vapor pressures of tantalum, molybdenum, and tungsten are relatively low compared with other metals at high temperatures, meeting the requirements of the environment for the material. These types of metals and their alloys can be used as candidate materials for the absorption piece;

[0042] Considering wear resistance and machining performance comprehensively to ensure the reliability and operability of the machining of the absorption piece, it is necessary to judge the physical and mechanical properties of the material. Among the three refractory metals of tantalum, molybdenum, and tungsten, molybdenum has a lower hardness, with a Mohs hardness of 5, which is not conducive to the friction working condition of the absorption piece during the sampling process. Tungsten has a higher hardness, with a Mohs hardness of 7.5, which is not conducive to machining the microstructures of the absorption piece. Considering wear resistance and machining performance comprehensively, tantalum is relatively more suitable as the base material of the absorption piece, and the Mohs hardness of tantalum is 6.5;

[0043] The selected material should have low reactivity to gas reactions. During the process of heating lunar soil with the absorption sheet, gases such as H2, N2, and H2O will escape. These gases have high reducibility. To prevent them from reacting chemically with the absorption sheet, a small amount of tungsten needs to be added to the tantalum-based substrate to form a tantalum-tungsten alloy (Ta-10W), which can ensure that these gases do not react with the absorption sheet and guarantee that the amount of volatile matter escaping matches the measured value. Therefore, the material of the absorption sheet is selected as the tantalum-tungsten alloy (Ta-10W).

[0044] Summarizing the above embodiments, an absorption sheet for in-situ micro-quantitative sampling and encapsulation of lunar soil samples in a rotary cutting manner according to the present invention can accurately control the sampling amount and particle size distribution of lunar soil. At the same time, it can exclude the influence of large particle lunar soil on the sampling process, achieve accurate control of the sampling amount and particle size distribution, and facilitate subsequent extraction and analysis of thermal volatile matter.

[0045] The present invention realizes micro-sampling of lunar soil by controlling the overall size of the absorption sheet; by controlling the diameter of the sample injection channel 13, it realizes the collection of lunar soil within a specific particle size range, limits the specific surface area range of lunar soil, further quantifies the volatile matter generated by heating lunar soil, reduces the uncertainty of lunar soil, and achieves particle size-defined collection.

[0046] The present invention determines the volume of the cavity by the envelope of the constant-volume gland 2 and the rotary cutting piece 1, which can ensure low-dispersion quantitative sampling for lunar soil under unknown working conditions, accurately control the sampling amount of lunar soil, and achieve constant-volume collection.

[0047] During the sample injection process of the present invention, there is a continuous filling pressure at the bottom of the absorption sheet, ensuring that the density of the lunar soil sample in the absorption sheet cavity is higher than that of the original lunar soil. Therefore, on the premise of ensuring a constant volume, quantitative sampling can be achieved, and constant-density collection can be realized.

[0048] The present invention selects a tantalum-tungsten alloy as the material for making the absorption sheet, enabling the absorption sheet to withstand extreme low-temperature sampling environments and high-temperature and high-vacuum heating environments, ensuring the smooth collection of samples without affecting the heating process.

[0049] The specific embodiments described above have further elaborated on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the invention. It can also be a reasonable combination of the features described in the above embodiments. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An absorption sheet for in-situ micro-quantitative sampling and encapsulation of rotary cutting lunar soil samples, characterized in that: It includes a rotary cutting slice (1) and a constant-volume pressing cover (2). The constant-volume pressing cover (2) is installed on the rotary cutting slice (1) to form a sample storage cavity, realizing the constant-volume collection of lunar soil; by controlling the size of the sample injection part, the collection of lunar soil within a specific particle size range is realized; the bottom of the rotary cutting slice (1) continuously applies a filling pressure to the lunar soil to realize the density-fixed collection of the lunar soil. The rotary cutting slice (1) includes a rotary cutting slice body, a plurality of cutting edges (12) and a plurality of sample injection channels (13). A plurality of sample injection channels (13) are arranged at the bottom of the rotary cutting slice body. The inlet end of the sample injection channel (13) is machined with a cutting edge (12). The cutting edge (12) generates a filling pressure under the rotary cutting action and interacts with the compacted lunar soil. The lunar soil sample enters the sample storage cavity through the sample injection channel (13) under the action of the bottom rotary cutting force and gradually fills the cavity. The materials of the rotary cutting slice (1) and the constant-volume pressing cover (2) are tantalum-tungsten alloy.

2. The absorbing sheet for in-situ micro-quantitative sampling and encapsulation of rotary cutting type lunar soil samples according to claim 1, characterized in that: The rotary cutting slice (1) further includes a first annular groove (11). The first annular groove (11) cooperates with the constant-volume pressing cover (2) to form a sample storage cavity.

3. The absorbent sheet for in-situ micro-quantitative sampling and encapsulation of rotary cutting type lunar soil samples according to claim 2, characterized in that: The constant-volume pressing cover (2) is provided with a second annular groove (21). The second annular groove (21) is opposite to the first annular groove (11) and buckles together.

4. The absorbent sheet for in-situ micro-quantitative sampling and encapsulation of rotary cutting type lunar soil samples according to claim 3, characterized in that: The sample injection channel (13) is communicated with the second annular groove (21) through a plurality of communication holes (16) opened on the rotary cutting slice (1).

5. The absorbent sheet for in-situ micro-quantitative sampling and encapsulation of rotary cutting type lunar soil samples according to claim 4, characterized in that: The communication hole (16) is an oval hole.

6. The absorbent sheet for in-situ micro-quantitative sampling and encapsulation of rotary cutting type lunar soil samples according to claim 1, 2, 3, 4 or 5, characterized in that: The rotary cutting slice (1) further includes a plurality of limit blocks (14) and a plurality of limit card slots (15). Limit blocks (14) and limit card slots (15) are arranged inside the rotary cutting slice body. The limit blocks (14) cooperate with the sampling device to drive the suction slice, and the limit card slots (15) cooperate with the sampling device to fix the suction slice.

7. The absorbent sheet for in-situ micro-quantitative sampling and encapsulation of rotary cutting type lunar soil samples according to claim 6, characterized in that: The limit card slot (15) is a wedge-shaped card slot.

8. The absorbent sheet for in-situ micro-quantitative sampling and encapsulation of rotary cutting type lunar soil samples according to claim 1, 2, 3, 4, 5 or 7, characterized in that: A plurality of pressing cover fixing pieces (17) are further arranged on the rotary cutting slice (1). The pressing cover fixing pieces (17) fix the constant-volume pressing cover (2).

9. The absorbent sheet for in-situ micro-quantitative sampling and encapsulation of rotary cutting type lunar soil samples according to claim 8, characterized in that: The pressing cover fixing pieces (16) are evenly distributed in a circle on the rotary cutting slice (1).

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