In-situ Micro Quantitative Sampling Device and Method with Fixed Particle Size, Fixed Volume and Fixed Compaction Degree for Volatile Component Detection of Lunar Regolith

Abstract

The present invention discloses an in-situ micro-quantitative sampling device and method for determining particle size, volume, and compaction density of volatile components in lunar soil, which relates to the field of aerospace technology and solves the problem that existing in-situ sampling detection devices cannot accurately control the sampling amount and particle size distribution. It includes a sampling tube and a number of absorption sheets. The absorption sheets are installed inside the sampling tube. By controlling the size of the sample injection part of the absorption sheets, the collection of lunar soil within a specific particle size range is achieved. A continuous filling pressure exists on the absorption surface at the bottom of the sampling tube to realize the constant-density collection of lunar soil by the absorption sheets. The absorption sheet 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. 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, facilitating subsequent thermal volatilization extraction and analysis.

Description

Technical Field

[0001] The present invention relates to the field of aerospace technology, and particularly to an in-situ micro-quantitative sampling device and method for determining particle size, volume, and density for detecting volatile components in lunar soil. Background Art

[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 an embodiment 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 composition of lunar soil 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 samples and high engineering costs encountered in sampling return analysis, the in-situ detection method of lunar soil substances has more advantages. In-situ sampling detection devices are generally carried on intelligent equipment such as landers and rovers that land on the moon, and sampling tools are used to obtain surface or subsurface lunar soil samples and transfer them to analytical instruments for on-site analysis. However, existing in-situ sampling detection devices generally adopt drilling and coring and surface shoveling methods, and it is impossible to accurately control the sampling volume and particle size distribution of the samples with such sampling methods. Summary of the Invention

[0004] In order to better complete the tasks of lunar soil sample collection and volatile component detection and solve the problem that existing in-situ sampling detection devices cannot accurately control the sampling volume and particle size distribution of samples, the present invention hereby provides an in-situ micro-quantitative sampling device and method for determining particle size, volume, and density for detecting volatile components in 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 particles of lunar soil on the sampling process, facilitating subsequent thermal volatile component extraction and analysis.

[0005] The present invention provides an in-situ micro-quantitative sampling device for determining particle size, volume, and density for detecting volatile components in lunar soil, which specifically includes a sampling tube and a plurality of absorbing sheets. The absorbing sheets are installed inside the sampling tube, and by controlling the size of the sample inlet part of the absorbing sheets, the collection of lunar soil within a specific particle size range is achieved; a continuous filling pressure exists on the absorbing surface at the bottom of the sampling tube to achieve the fixed-density collection of lunar soil by the absorbing sheets; the absorbing sheets include rotating slices and fixed-volume pressing covers, and the fixed-volume pressing covers are installed on the rotating slices to form a sample storage cavity to achieve the fixed-volume collection of lunar soil.

[0006] Furthermore, the sampling tube includes a support tube, a shaft, a push block, and a leaf spring. The shaft is installed inside the support tube and rotatably connected to the support tube. The push block and the absorption sheet are sleeved on the shaft. The leaf spring is fixed to the lower end of the shaft and fixes the absorption sheet. The power device drives the shaft to rotate, and the shaft drives the push block and the absorption sheet to rotate together.

[0007] Furthermore, the leaf spring is provided with a plurality of clamping blocks, and the clamping blocks fix the absorption sheet.

[0008] Furthermore, the push block is provided with a key structure, and the key structure slides in cooperation with the shaft.

[0009] Furthermore, the sampling tube further includes a plug, and the plug is inserted at the lower end of the support tube and located between the support tube and the absorption sheet.

[0010] Furthermore, the rotary cutting slice includes a rotary cutting slice body, a plurality of cutting edges, and a plurality of sample inlet channels. The sample inlet channels are arranged at the bottom of the rotary cutting slice body. The inlet ends of the sample inlet channels are processed with cutting edges. The cutting edges generate a filling pressure under the rotary cutting action and interact with the compacted lunar regolith. The lunar regolith sample enters the sample storage cavity through the sample inlet channels under the action of the bottom rotary cutting force and gradually fills the cavity.

[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 slide in cooperation with the shaft, and the limiting grooves cooperate with the clamping blocks to fix the absorption sheet.

[0012] 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 storage cavity.

[0013] Furthermore, the constant-volume pressing cover is provided with a second annular groove, and the second annular groove faces the first annular groove and is buckled together with it.

[0014] A sampling method using the above-mentioned in-situ micro-quantitative sampling device with fixed particle size, fixed volume, and fixed density for lunar regolith volatile detection specifically includes the following steps:

[0015] a. Make the bottom of the absorption sheet contact and compact the lunar regolith;

[0016] b. The shaft drives the absorption sheet to rotate forward to start sampling;

[0017] c. After sampling is completed, the push block pushes the absorption sheet that has completed sampling out of the sampling tube;

[0018] d. The shaft continues to rotate, and the push block pushes the next absorption sheet onto the clamping blocks;

[0019] e. The shaft rotates in the reverse direction to raise the push block;

[0020] f. Repeat steps a to e.

[0021] The beneficial effects of the in-situ micro-quantitative sampling device and method with fixed particle size, fixed volume, and fixed density for lunar soil volatile detection according to the present invention are as follows:

[0022] (1) For the in-situ micro-quantitative sampling device and method with fixed particle size, fixed volume, and fixed density for lunar soil volatile detection according to the present invention, by setting the absorption sheet, the sampling amount and particle size distribution of lunar soil can be accurately controlled. At the same time, the influence of large particles of lunar soil on the sampling process can be excluded, realizing accurate control of the sampling amount and particle size distribution, which is convenient for subsequent extraction and analysis of thermal volatiles.

[0023] (2) For the in-situ micro-quantitative sampling device and method with fixed particle size, fixed volume, and fixed density for lunar soil volatile detection according to the present invention, by limiting the diameter of the sample injection channel on the absorption sheet, the collection of lunar soil within a specific particle size range is realized, the range of the specific surface area of lunar soil is limited, the volatiles generated by heating the lunar soil are further quantified, the uncertainty of lunar soil is reduced, and fixed-particle-size collection is realized.

[0024] (3) For the in-situ micro-quantitative sampling device and method with fixed particle size, fixed volume, and fixed density for lunar soil volatile detection according to the present invention, through the envelope of the constant-volume gland and the rotary slice, the determination of the volume of the cavity is realized, which can ensure low-dispersion quantitative sampling for lunar soil under unknown working conditions, accurately control the sampling amount of lunar soil, and realize constant-volume collection.

[0025] (4) For the in-situ micro-quantitative sampling device and method with fixed particle size, fixed volume, and fixed density for lunar soil volatile detection according to the present invention, during the sample injection process, 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 realized, and constant-density collection is realized.

[0026] (5) For the in-situ micro-quantitative sampling device and method with fixed particle size, fixed volume, and fixed density for lunar soil volatile detection according to the present invention, through the provided sampling tube, continuous automatic sampling of several absorption sheets can be realized, preventing lunar soil from entering the interior of the device, and ensuring the continuous reliability of the device. Description of the Drawings

[0027] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0028] In the drawings:

[0029] Figure 1It is a schematic cross-sectional structure diagram of a sampling device of a fixed-particle-size, fixed-volume, and fixed-compaction-degree in-situ micro-quantitative sampling device for detecting volatile components in lunar soil according to the present invention;

[0030] Figure 2 It is a schematic cross-sectional structure diagram of the sampling end of a sampling device of a fixed-particle-size, fixed-volume, and fixed-compaction-degree in-situ micro-quantitative sampling device for detecting volatile components in lunar soil according to the present invention;

[0031] Figure 3 It is a schematic structure diagram of an absorption sheet of a fixed-particle-size, fixed-volume, and fixed-compaction-degree in-situ micro-quantitative sampling device for detecting volatile components in lunar soil according to the present invention;

[0032] Figure 4 It is a schematic cross-sectional structure diagram of an absorption sheet of a fixed-particle-size, fixed-volume, and fixed-compaction-degree in-situ micro-quantitative sampling device for detecting volatile components in lunar soil according to the present invention;

[0033] Figure 5 It is a schematic structure diagram of a rotary cutting sheet of a fixed-particle-size, fixed-volume, and fixed-compaction-degree in-situ micro-quantitative sampling device for detecting volatile components in lunar soil according to the present invention;

[0034] Figure 6 It is a schematic bottom structure diagram of a rotary cutting sheet of a fixed-particle-size, fixed-volume, and fixed-compaction-degree in-situ micro-quantitative sampling device for detecting volatile components in lunar soil according to the present invention;

[0035] Figure 7 It is a schematic structure diagram of a fixed-volume pressing cover of a fixed-particle-size, fixed-volume, and fixed-compaction-degree in-situ micro-quantitative sampling device for detecting volatile components in lunar soil according to the present invention;

[0036] Wherein: 1 - support tube, 2 - shaft, 3 - push block, 4 - leaf spring, 41 - clamping block, 5 - absorption sheet, 51 - rotary cutting sheet, 511 - first annular groove, 512 - cutting edge, 513 - sample injection channel, 514 - limiting block, 515 - limiting card slot, 52 - fixed-volume pressing cover, 521 - second annular groove, 6 - plug. Specific embodiments

[0037] The following further details the specific embodiments of the present invention with reference to the accompanying drawings:

[0038] Specific embodiment one: Refer to Figures 1-7Describe this embodiment. An in-situ micro-quantitative sampling device for determining particle size, volume, and compaction density for detecting volatile components in lunar soil according to this embodiment includes a sampling tube and a number of absorption sheets 5, and the absorption sheets 5 are installed inside the sampling tube; by controlling the size of the sample injection part of the absorption sheets 5, the collection of lunar soil within a specific particle size range is achieved; a filling pressure continuously exists on the absorption surface of the absorption sheets 5 at the bottom of the sampling tube, achieving the collection of lunar soil with a fixed compaction density by the absorption sheets 5; the absorption sheets 5 include rotary cutting sheets 51 and fixed-volume pressing caps 52, and the fixed-volume pressing caps 52 are installed on the rotary cutting sheets 51 to form a sample storage cavity, achieving the fixed-volume collection of lunar soil.

[0039] The sampling tube further includes a support tube 1, a shaft 2, a push block 3, and a leaf spring 4. The shaft 2 is installed inside the support tube 1, and the upper end of the shaft 2 is rotatably connected to the support tube 1 through a bearing. The push block 3 and the absorption sheets 5 are coaxially sleeved on the shaft 2. The leaf spring 4 is fixed to the lower end of the shaft 2 to fix the absorption sheets 5; the power device drives the shaft 2 to rotate, and the shaft 2 drives the push block 3 and the absorption sheets 5 to rotate together. At the same time, an external thread is provided on the outer surface of the push block 3, and an internal thread is provided on the inner wall surface of the support tube 1. The push block 3 and the support tube 1 are engaged by threads to push the absorption sheets 5.

[0040] A hole is opened at the lower end of the shaft 2, and the leaf spring 4 is fixedly connected to the hole at the lower end of the shaft 2.

[0041] The leaf spring 4 is provided with a number of clamping blocks 41, and the clamping blocks 41 fix the absorption sheets 5. The clamping blocks 41 are wedge-shaped clamping blocks.

[0042] A key structure is provided on the push block 3, and two symmetric grooves are opened on the shaft 2. The key structure is embedded into the grooves of the shaft 2 to cooperate with the shaft 2 for sliding; when the power device drives the shaft 2 to rotate, the shaft 2 drives the push block 3 to rotate through the cooperation of the key structure and the grooves. And because the push block 3 and the support tube 1 are engaged by threads, the push block 3 can reciprocally slide on the shaft 2 while rotating.

[0043] The sampling tube further includes a plug 6. The plug 6 is inserted at the lower end of the support tube 1 and is located between the support tube 1 and the absorption sheets 5, which is used to prevent lunar soil from entering the device during sampling, thereby preventing lunar soil from affecting the normal operation of the device.

[0044] The rotary cutting sheet 51 includes a rotary cutting sheet body, a number of cutting edges 512, and a number of sample injection channels 513. The sample injection channels 513 are provided at the bottom of the rotary cutting sheet body. The sample injection channels 513 are obliquely arranged. The inlet end of the sample injection channels 513 is processed with cutting edges 512. The cutting edges 512 generate a filling pressure under the rotary cutting action, which can achieve the cutting of lunar soil. Interacting with the compacted lunar soil, the lunar soil after being cut and damaged is transported along the rake face of the cutting edges 512 into the sample storage cavity of the absorption sheets 5 through the sample injection channels 513 under the action of the bottom rotary cutting force and gradually fills the cavity.

[0045] The rotary slicing piece 51 further includes a plurality of limiting blocks 514 and a plurality of limiting card slots 515. The limiting blocks 514 and the limiting card slots 515 are arranged on the inner side of the rotary slicing piece body. The limiting blocks 514 are slidably matched with the shaft 2, and the limiting card slots 515 are matched with the clamping blocks 41 to fix the suction sheet 5.

[0046] A first annular groove 511 is further arranged at the upper end of the rotary slicing piece 51. The first annular groove 511 and the constant volume pressing cover 52 cooperate to form a sample storage cavity.

[0047] A second annular groove 521 is arranged on the constant volume pressing cover 52. The second annular groove 521 faces and is buckled together with the first annular groove 511. When the lunar soil in the cavity reaches the dense state, the constant volume pressing cover 52 continuously applies pressure to the lunar soil sample in the sample cavity, so that the internal filling confining pressure in 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 pressing cover 52 applies pressure to the lunar soil sample in the sample inlet channel 513, forming a force chain effect inside the sample to make the sample state stable.

[0048] A sampling method using the above in-situ micro-quantitative sampling device for lunar soil volatile detection with fixed particle size, fixed volume and fixed density specifically includes the following steps:

[0049] a. Transfer the sampling device to make the bottom of the suction sheet 5 contact and compact the lunar soil;

[0050] b. Drive the shaft 2 to rotate through an external power device. The shaft 2 drives the suction sheet 5 to rotate forward to start sampling;

[0051] c. After sampling is completed, the push block 3 pushes the suction sheet 5 that has completed sampling out of the sampling tube;

[0052] d. The shaft 2 continues to rotate, and the push block 3 pushes the next suction sheet 5 to be stuck on the clamping block 41 on the leaf spring 4;

[0053] e. The shaft 2 rotates in the reverse direction to raise the push block 3;

[0054] f. Repeat steps a to e.

[0055] The specific working principle of the above in-situ micro-quantitative sampling device for lunar soil volatile detection is explained as follows:

[0056] By controlling the diameter of the sample inlet channel 513, the suction sheet 5 can realize selecting lunar soil with a particle size below a specific scale, limiting the range of the specific surface area of the lunar soil, further quantifying the volatiles generated by heating the lunar soil, reducing the uncertainty of the lunar soil, and achieving the purpose of fixed particle size;

[0057] The volume of the sampling cavity of the absorbing sheet 5 is determined by the volume of the cavity formed by the constant volume pressure cover 52 and the rotary slice 51, which can ensure that low discrete quantitative sampling is achieved for unknown working conditions of the star soil, achieving the purpose of constant volume of the cavity;

[0058] During the sampling process of the absorption sheet 5, there is continuous filling pressure on the bottom absorption surface, ensuring that the density of the star soil sample in the cavity is higher than that of the original star soil. Therefore, under the premise of ensuring a constant volume, quantitative sampling can be achieved to achieve the purpose of constant density.

[0059] When the sampling work begins, a number of absorbing sheets 5 are placed inside the sampling tube and sleeved on the shaft 2, and the limit blocks 514 set on the absorbing sheets 5 are embedded in the grooves opened on the shaft 2. The sampling tube carries a number of absorbing sheets 5 close to the surface of the sampling area, and makes the bottom of the absorbing sheets 5 contact and compact the star soil. At this time, the position of the absorbing sheets 5 is fixed by the wedge-shaped limit block on the leaf spring 4. The shaft 2 is driven to rotate by the power device, and the shaft 2 drives the push block 3 and the absorbing sheet 5 to rotate forward together. At this time, the cutting edge 512 at the bottom of the absorbing sheet 5 generates filling pressure under the action of rotary cutting, and interacts with the compacted star soil. The star soil sample enters the sample storage cavity through the injection channel 513 under the action of the rotary cutting force at the bottom, and gradually fills the cavity; at the same time, the absorbing sheet can move the large particles of star soil at the bottom to the side of the absorbing sheet 5 with the rotary cutting movement during sampling, so as to prevent the injection channel 513 from being blocked.

[0060] After the absorbing sheet 5 has finished sampling, the sampling tube is transferred to the subsequent receiving device for the absorbing sheet 5. At this time, the power device continues to drive the shaft 2 to rotate in the forward direction, and the push block 3 moves toward the absorbing sheet 5 through the threaded fit between the push block 3 and the support tube 1, and generates an outward thrust on the absorbing sheet 5. The thrust overcomes the elastic force of the leaf spring 4, so that the absorbing sheet 5 is freed from the fixing of the leaf spring 4 on the absorbing sheet 5 through the matching inclined surface of the limit card slot 515 and the card block 41, so that the absorbing sheet 5 is separated from the sampling tube.

[0061] After the absorbing sheet 5 that has completed the sampling work is separated from the sampling tube, the shaft 2 continues to rotate forward, and the push block 2 is used to push the next empty absorbing sheet 5 to the working position and clamp it on the clamping block 41. At this time, the power device drives the shaft 2 to rotate in the opposite direction to make the push block 3 rise and pull a certain distance from the absorbing sheet 5, and then complete the next sampling work.

[0062] Before the sampling starts, there is no lunar soil in the cavity of the absorption sheet 5, the volume of the lunar soil is 0, and there is no confining pressure in the cavity of the absorption sheet 5. As continuous sampling progresses, the volume of the lunar soil in the cavity increases. During this process, the density of the lunar soil remains almost unchanged, and there is no mutual extrusion between the lunar soil particles, and no confining pressure P is formed in the cavity of the absorption sheet. The continuous rotary pressing and feeding action causes the lunar soil to continue to fill the cavity of the absorption sheet 5. Limited by the cavity volume of the absorption sheet 5, the growth rate of the lunar soil volume slows down, the lunar soil is extruded and its density increases rapidly, a confining pressure is formed in the cavity and continues to increase. Finally, the action of the confining pressure on the lunar soil balances with the action of the rotary pressing and feeding of the absorption sheet 5, the confining pressure in the cavity reaches the maximum value, and the density of the lunar soil in the cavity tends to be stable.

[0063] Summarizing the above embodiments, a device and method for in-situ micro-quantitative sampling with fixed particle size, fixed volume and fixed density for lunar soil volatile detection according to the present invention can accurately control the sampling amount and particle size distribution of lunar soil by setting the absorption sheet 5. 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 thermal volatile extraction and analysis.

[0064] The present invention realizes the collection of lunar soil within a specific particle size range by controlling the diameter of the sampling channel 513, limits the range of the specific surface area of the lunar soil, further quantifies the volatile components generated by heating the lunar soil, reduces the uncertainty of the lunar soil, and realizes sampling with a fixed particle size. By the envelope of the fixed-volume gland 52 and the rotary cutting piece 51, the determination of the cavity volume is realized, which can ensure low-dispersion quantitative sampling for lunar soil under unknown working conditions, accurately control the sampling amount of lunar soil, and realize sampling with a fixed volume.

[0065] During the sampling 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 cavity of the absorption sheet is higher than that of the original lunar soil. Therefore, on the premise of ensuring a fixed volume, quantitative sampling can be realized, and sampling with a fixed density can be achieved.

[0066] A device and method for in-situ micro-quantitative sampling with fixed particle size, fixed volume and fixed density for lunar soil volatile detection according to the present invention can realize the continuous automatic sampling function of several absorption sheets through the set sampling tube, and prevent lunar soil from entering the interior of the device, ensuring the continuous reliability of the device.

[0067] The above specific embodiments have further elaborated on the purpose, technical solution 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 principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An in-situ micro quantitative sampling method with fixed particle size, fixed volume and fixed compactness for detecting volatile components in lunar soil, characterized in that: Specifically, it includes the following steps: a. The bottom of the absorption sheet (5) contacts and compacts the lunar regolith; b. The shaft (2) drives the absorption sheet (5) to rotate forward to start sampling; c. After sampling is completed, the push block (3) pushes the absorption sheet (5) that has completed sampling out of the sampling tube; d. The shaft (2) continues to rotate, and the push block (3) pushes the next absorption sheet (5) to be stuck on the locking block (41); e. The shaft (2) rotates in the reverse direction to raise the push block (3); f. Repeat steps a~e; An apparatus for in-situ micro-quantitative sampling with fixed particle size, fixed volume and fixed density for lunar regolith volatile detection, comprising a sampling tube and a number of absorption sheets (5). The absorption sheets (5) are installed inside the sampling tube. By controlling the size of the sample injection part of the absorption sheets (5), the collection of lunar regolith within a specific particle size range is achieved; a filling pressure continuously exists on the absorption surface at the bottom of the sampling tube to achieve fixed-density collection of lunar regolith by the absorption sheets (5); the absorption sheet (5) includes a rotary cutting sheet (51) and a fixed-volume pressing cover (52). The fixed-volume pressing cover (52) is installed on the rotary cutting sheet (51) to form a sample storage cavity, thereby achieving fixed-volume collection of lunar regolith.

2. The in-situ micro quantitative sampling method with fixed particle size, fixed volume and fixed compactness for volatile matter detection in lunar soil according to claim 1, characterized in that: The sampling tube includes a support tube (1), a shaft (2), a push block (3) and a leaf spring (4). The shaft (2) is rotatably installed inside the support tube (1). The push block (3) and the absorption sheets (5) are sleeved on the shaft (2). The leaf spring (4) is fixed to the lower end of the shaft (2) to fix the absorption sheets (5); a power device drives the shaft (2) to rotate, and the shaft (2) drives the push block (3) and the absorption sheets (5) to rotate together.

3. The in-situ micro quantitative sampling method with fixed particle size, fixed volume and fixed density for volatile matter detection in lunar soil according to claim 2, characterized in that: A number of locking blocks (41) are provided on the leaf spring (4) to fix the absorption sheets (5).

4. The in-situ micro quantitative sampling method with fixed particle size, fixed volume and fixed compactness for volatile matter detection in lunar soil, characterized in that: A key structure is provided on the push block (3), and the key structure cooperates with the shaft (2) for sliding.

5. The in-situ micro-quantitative sampling method with fixed particle size, fixed volume and fixed density for volatile detection of lunar soil according to claim 2, 3 or 4, characterized in that: The sampling tube further includes a plug (6), and the plug (6) is inserted at the lower end of the support tube (1) and is located between the support tube (1) and the absorption sheets (5).

6. The in-situ micro-quantitative sampling method with fixed particle size, fixed volume and fixed density for volatile detection of lunar soil, as claimed in claim 1, 2, 3 or 4, wherein: The rotary cutting sheet (51) includes a rotary cutting sheet body, a number of cutting edges (512) and a number of sample injection channels (513). Sample injection channels (513) are provided at the bottom of the rotary cutting sheet body. Cutting edges (512) are machined at the inlet ends of the sample injection channels (513). The cutting edges (512) generate a filling pressure under the rotary cutting action and interact with the compacted lunar regolith. The lunar regolith sample enters the sample storage cavity through the sample injection channels (513) under the action of the bottom rotary cutting force and gradually fills the cavity.

7. The in-situ micro quantitative sampling method with fixed particle size, fixed volume and fixed compactness for volatile matter detection in lunar soil, characterized in that: The rotary cutting sheet (51) further includes a number of limiting blocks (514) and a number of limiting card slots (515). Limiting blocks (514) and limiting card slots (515) are provided inside the rotary cutting sheet body. The limiting blocks (514) cooperate with the shaft (2) for sliding, and the limiting card slots (515) cooperate with the locking blocks (41) to fix the absorption sheets (5).

8. The in-situ micro-quantitative sampling method with fixed particle size, fixed volume and fixed density for volatile matter detection in lunar soil, characterized in that: The rotary cutting sheet (51) further includes a first annular groove (511), and the first annular groove (511) cooperates with the fixed-volume pressing cover (52) to form a sample storage cavity.

9. The in-situ micro quantitative sampling method with fixed particle size, fixed volume and fixed compactness for volatile matter detection in lunar soil according to claim 8, characterized in that: A second annular groove (521) is provided on the fixed-volume pressing cover (52), and the second annular groove (521) faces and is buckled together with the first annular groove (511).

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