A tool and method for low-temperature shaping and defect suppression of simulated lunar soil profile samples

Abstract

The present invention proposes a tool and method for low-temperature shaping and defect suppression of simulated lunar soil profile samples, belonging to the field of space resource exploration. This tool addresses the problems of cracks easily generated during the lunar soil cooling process and low barrel strength. A simulated lunar soil preparation tool comprises an upper cover plate, a barrel assembly, a sampling screw sleeve, a center hole former, a liquid nitrogen interface, a placeholder assembly, a temperature measurement assembly, and simulated lunar soil. The upper cover plate is disposed at the upper end of the barrel assembly. The barrel assembly comprises an outer barrel and an inner barrel, with a heat exchange chamber between the outer and inner barrels. The outer barrel is provided with two liquid nitrogen interfaces connected to the heat exchange chamber. Multiple sampling screw sleeves are evenly distributed from top to bottom on one sidewall of the inner barrel. The center hole former is used to form a center hole in the center of the simulated lunar soil when compacting it. During compaction, each sampling screw sleeve is internally threadedly connected to the placeholder assembly. The temperature measurement assembly is used to measure the temperature of the simulated lunar soil when the compacted simulated lunar soil is cooled. This tool is primarily used for preparing simulated lunar soil.

Description

Technical Field

[0001] The present invention belongs to the field of space resource exploration, and in particular relates to a tool and method for low-temperature shaping and defect suppression of simulated lunar soil profile samples. Background Art

[0002] As the only satellite of the Earth and the closest extraterrestrial body to the Earth, the Moon has rich mineral resources and has always been the primary target of deep space exploration by countries around the world.

[0003] my country's testing of the effectiveness of drilling for hydrated lunar regolith in the polar regions requires extensive drilling tests on hydrated simulated lunar regolith. This hydrated simulated lunar regolith requires water addition, static compaction, and subsequent preparation through processes such as step-cooling. During the step-cooling process, the water in the simulated lunar regolith freezes in the cold environment, causing it to expand. This frost heave generates significant and uneven frost stress. This stress can also cause cracks and defects in the simulated lunar regolith during cooling, leading to inaccurate data during experiments measuring its mechanical properties.

[0004] Current simulated lunar soil sample preparation devices often use sidewall perforations for temperature measurement and sampling. These separate temperature and sampling holes result in excessive holes in the barrel, weakening it. During the compaction process, the pressure from the press can easily damage the barrel's structure.

[0005] Therefore, preventing the defects of frozen heaving and cracking of the water-containing simulated lunar soil during the step cooling process and enhancing the strength of the barrel are issues that need to be urgently addressed. Summary of the Invention

[0006] In view of this, the present invention aims to propose a low-temperature shaping and defect suppression tooling and method for simulating lunar soil profile samples, so as to solve the problems of cracks easily generated during the cooling process of the lunar soil and low barrel strength.

[0007] To achieve the above-mentioned purpose, according to one aspect of the present invention, a tool for low-temperature shaping and defect suppression of simulated lunar soil profile samples is provided, comprising an upper cover plate, a barrel assembly, a sampling screw sleeve, a center hole former, a liquid nitrogen interface, a placeholder assembly, a temperature measurement assembly and simulated lunar soil, wherein an upper cover plate is provided on the upper end of the barrel assembly, the barrel assembly comprises an outer barrel and an inner barrel, a heat exchange cavity is provided between the outer barrel and the inner barrel, two liquid nitrogen interfaces communicating with the heat exchange cavity are provided on the outer barrel, a center hole former is concentrically provided in the inner barrel, and the inner barrel and the center hole former are connected. Simulated lunar soil is placed between the inner barrel, and multiple sampling screw sleeves are evenly distributed on the side wall of one side of the inner barrel from top to bottom. One end of each sampling screw sleeve is connected to the inner barrel, and the other end of each sampling screw sleeve passes through the outer barrel and is connected to the outside world. The center hole former is used to form a center hole in the middle of the simulated lunar soil when compacting the simulated lunar soil; when compacting the simulated lunar soil, the inner thread of each sampling screw sleeve is connected to the placeholder component, and when cooling the compacted simulated lunar soil, the inner thread of each sampling screw sleeve is connected to the temperature measuring component, and the temperature measuring component is used to measure the temperature of the simulated lunar soil.

[0008] Furthermore, the temperature measurement component includes a sampling plug and a temperature sensor. The sampling plug is threadedly connected to a sampling screw sleeve at a corresponding position. An opening is provided on the sampling plug, and the temperature sensor is provided in the opening.

[0009] Furthermore, the barrel assembly also includes a top flange, a bottom flange, an adapter plate, an adjustment assembly and a lower cover plate. The upper ends of the outer barrel and the inner barrel are connected to the top flange, and the lower ends of the outer barrel and the inner barrel are connected to the bottom flange. The upper end of the top flange is connected to the upper cover plate, the lower end surface of the bottom flange is connected to the upper end surface of the lower cover plate, and the lower cover plate is connected to the upper end surface of the adapter plate. The bottom flange and the adapter plate are both connected to the adjustment assembly, and the adjustment assembly is used to fix the bottom flange and the adapter plate.

[0010] Furthermore, the adjustment assembly includes a clamping screw, an adjustment screw and a pressure plate. A plurality of pressure plates are evenly distributed circumferentially on the upper end surface of the bottom flange. Each of the pressure plates is threadedly connected to the adjustment screw on the side away from the outer barrel. The nut of the adjustment screw is set downward and rests on the upper end surface of the adapter plate. Each of the pressure plates is threadedly connected to the clamping screw on the side close to the outer barrel, and each of the clamping screws is threadedly connected to the adapter plate.

[0011] Furthermore, the center hole former includes a core shaft flap, a screen sleeve, a wedge block and a guide block. A plurality of core shaft flaps are evenly distributed around the circumference of the wedge block. Each core shaft flap is slidably set on the end face of the corresponding position of the wedge block through a guide block. All core shaft flaps and the wedge block form a cylinder. The lower end of each core shaft flap is slidably set on the upper end face of the lower cover plate. When the wedge block moves downward, each core shaft flap slides radially around the cylinder and after sliding to the limit position, the core shaft flap is fixed to the lower cover plate by bolts. The upper end face of the cylinder is abutted against the lower end face of the upper cover plate, and a screen sleeve is set on the circumference of the cylinder.

[0012] Furthermore, the upper end surface and the lower end surface of the wedge block are both provided with threaded holes, and the lower cover plate is provided with a downward screw that is threadably matched with the threaded hole on the lower end surface of the wedge block.

[0013] Furthermore, each guide block is fixed to the corresponding core shaft petal by a screw.

[0014] Furthermore, hanging rings are symmetrically provided on both sides of the upper end surface of the upper cover plate.

[0015] Furthermore, the placeholder component is a threaded plug.

[0016] According to another aspect of the present invention, a method for preparing simulated lunar regolith using the above-mentioned simulated lunar regolith profile sample low-temperature shaping and defect suppression tooling is provided, characterized in that it includes the following steps:

[0017] S1. Install the placeholder assembly in the sampling screw sleeve and install the center hole former on the lower cover;

[0018] S2. Add a certain amount of simulated lunar soil between the central hole former and the inner barrel and compact it until the density of the compacted simulated lunar soil reaches a certain value;

[0019] S3. Remove the placeholder assembly and the center hole former, install the temperature measuring assembly in the sampling screw sleeve, and cool the inner barrel to complete the lunar soil preparation;

[0020] S4. Remove the temperature measuring assembly and conduct a sampling test on the lunar soil at the sampling screw sleeve.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. This tool is equipped with a center hole former to form a center hole in the middle of the lunar soil sample. During the freezing stage, the center hole is used to control the expansion trend and prevent the generation of cracks.

[0023] 2. This tooling is equipped with a sampling screw sleeve to serve as a drilling hole, a temperature measuring hole and a sampling hole, which can reduce the number of holes, increase the strength of the barrel and increase the reliability of the tooling;

[0024] 3. This tool can quickly level the bottom flange and adapter plate by setting the adjustment component;

[0025] 4. This tool is equipped with lifting rings, which makes it easy to lift. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 This is an overall cross-sectional view of a low-temperature shaping and defect suppression tooling for simulated lunar soil profile samples according to the present invention;

[0028] Figure 2 This is a schematic structural diagram of the adjustment assembly of the present invention;

[0029] Figure 3 This is a schematic diagram of the connection structure between the sampling plug and the sampling screw sleeve of the present invention;

[0030] Figure 4 A top view of a tool for low-temperature shaping and defect suppression of simulated lunar soil profile samples according to the present invention;

[0031] Figure 5 is a cross-sectional view of the adapter plate of the present invention;

[0032] Figure 6 The present invention Figure 5 A partial enlarged view of part A;

[0033] Figure 7 A bottom view of a tool for low-temperature shaping and defect suppression of simulated lunar soil profile samples according to the present invention;

[0034] Figure 8 A three-dimensional diagram of a low-temperature shaping and defect suppression tool for a simulated lunar soil profile sample according to the present invention;

[0035] Figure 9 A side view of a tool for low-temperature shaping and defect suppression of simulated lunar soil profile samples according to the present invention;

[0036] Figure 10 A top view of the center hole former according to the present invention;

[0037] Figure 11 A three-dimensional diagram of the center hole former according to the present invention;

[0038] Figure 12 It is a cross-sectional view of the center hole former described in the present invention.

[0039] Upper cover plate 1; top flange 2; outer barrel 3; inner barrel 4; sampling plug 5; sampling screw sleeve 6; bottom flange 7; adapter plate 8; lower cover plate 9; tightening screw 10; adjusting screw 11; pressure plate 12; core shaft petal 13; screen sleeve 14; liquid nitrogen interface 15; wedge 16; simulated lunar soil 17; guide block 18. DETAILED DESCRIPTION

[0040] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features therein can be combined with each other in the absence of conflict, and the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0041] Referring to the accompanying drawings, this embodiment is described. According to one aspect of the present invention, a tool for low-temperature shaping and defect suppression of simulated lunar soil profile samples is provided, including an upper cover plate 1, a barrel assembly, a sampling screw sleeve 6, a center hole former, a liquid nitrogen interface 15, a placeholder assembly, a temperature measurement assembly and simulated lunar soil 17. The upper end of the barrel assembly is provided with an upper cover plate 1, and the barrel assembly includes an outer barrel 3 and an inner barrel 4. A heat exchange cavity is provided between the outer barrel 3 and the inner barrel 4. Two liquid nitrogen interfaces 15 communicating with the heat exchange cavity are provided on the outer barrel 3. A center hole former is concentrically provided in the inner barrel 4. The inner barrel 4 and the center hole former are connected. A simulated lunar soil 17 is placed between the inner barrel 4, and a plurality of sampling screw sleeves 6 are evenly distributed on the side wall of one side of the inner barrel 4 from top to bottom. One end of each sampling screw sleeve 6 is connected to the inner barrel 4, and the other end of each sampling screw sleeve 6 passes through the outer barrel 3 and is connected to the outside world. The center hole former is used to form a center hole in the middle of the simulated lunar soil 17 when compacting the simulated lunar soil 17; when compacting the simulated lunar soil 17, the internal thread of each sampling screw sleeve 6 is connected to the placeholder component; when cooling the compacted simulated lunar soil 17, the internal thread of each sampling screw sleeve 6 is connected to the temperature measuring component, and the temperature measuring component is used to measure the temperature of the simulated lunar soil 17. The two liquid nitrogen interfaces 15 are connected to the liquid nitrogen inlet pipeline and the outlet pipeline respectively. The two liquid nitrogen interfaces 15 are respectively arranged on the outer wall of the outer barrel 3 near the top side and the bottom side. The liquid nitrogen interface 15 near the bottom side is externally connected to the liquid nitrogen inlet pipeline. When adding simulated lunar soil, the liquid nitrogen interface 15 is blocked to prevent the mixing of lunar soil particles. When compacting the simulated lunar soil 17, the center hole former and the inner barrel 4 cooperate to form a center hole in the middle of the simulated lunar soil 17, and then the center hole former is removed. During the freezing stage, the simulated lunar soil 17 will be frozen due to moisture. When freezing expansion occurs, the center hole provides space for freezing expansion, so that the expansion proceeds in the direction of the center hole, thereby preventing the occurrence of cracks. By arranging a sampling screw sleeve 6 on the outer barrel 3 and the inner barrel 4, the sampling screw sleeve 6 can cooperate with the placeholder component to compact the lunar soil during the compaction of simulated lunar soil 17 stage, cooperate with the temperature measuring component to measure temperature during the freezing stage, and can perform sampling during the sampling stage, thereby reducing the number of holes opened on the outer barrel 3 and the inner barrel 4, and increasing the rigidity of the connection between the outer barrel 3 and the inner barrel 4 through the sampling screw sleeve 6, thereby improving the strength of the barrel body.

[0042] In this embodiment, the temperature measurement assembly includes a sampling plug 5 and a temperature sensor. The sampling plug 5 is threadedly connected to a corresponding sampling screw 6. The sampling plug 5 is provided with an opening, and the temperature sensor is disposed within the opening. The threaded engagement between the sampling plug 5 and the sampling screw 6 facilitates removal, facilitating installation of the temperature sensor. Furthermore, the easy removal of the sampling plug 5 facilitates subsequent sampling of the simulated lunar soil 17.

[0043] In this embodiment, the barrel assembly also includes a top flange 2, a bottom flange 7, an adapter plate 8, an adjustment assembly and a lower cover plate 9. The upper ends of the outer barrel 3 and the inner barrel 4 are connected to the top flange 2, and the lower ends of the outer barrel 3 and the inner barrel 4 are connected to the bottom flange 7. The upper end of the top flange 2 is connected to the upper cover plate 1, and the lower end surface of the bottom flange 7 is connected to the upper end surface of the lower cover plate 9. The lower cover plate 9 is connected to the upper end surface of the adapter plate 8. The bottom flange 7 and the adapter plate 8 are both connected to the adjustment assembly, and the adjustment assembly is used to fix the bottom flange 7 and the adapter plate 8. The outer barrel 3 and the inner barrel 4 are both welded to the top flange 2, and the outer barrel 3 and the inner barrel 4 are both welded to the bottom flange 7 to improve rigidity.

[0044] In this embodiment, the adjustment assembly includes a compression screw 10, an adjustment screw 11, and a pressure plate 12. Multiple pressure plates 12 are evenly distributed around the circumference of the upper end surface of the bottom flange 7. Each pressure plate 12 is threadedly connected to an adjustment screw 11 on the side away from the outer barrel 3. The nut of the adjustment screw 11 is positioned downward and abuts against the upper end surface of the adapter plate 8. Each pressure plate 12 is threadedly connected to a compression screw 10 on the side closer to the outer barrel 3. Each compression screw 10 is threadedly connected to the adapter plate 8. By turning the adjustment screw 11, the pressure plate 12 can be quickly supported, and tightened by the compression screw 10, the rigidity of the connection can be increased.

[0045] In this embodiment, the center hole former includes a core shaft flap 13, a screen sleeve 14, a wedge block 16 and a guide block 18. A plurality of core shaft flaps 13 are evenly distributed around the circumference of the wedge block 16. Each of the core shaft flaps 13 is slidably set on the end face of the corresponding position of the wedge block 16 through a guide block 18. All core shaft flaps 13 and the wedge block 16 form a cylinder. The lower end of each core shaft flap 13 is slidably set on the upper end face of the lower cover plate 9. When the wedge block 16 moves downward, each core shaft flap 13 slides radially around the cylinder and is fixed to the lower cover plate 9 by bolts after sliding to the limit position. The upper end face of the cylinder is abutted against the lower end face of the upper cover plate 1. A screen sleeve 14 is set on the circumference of the cylinder. The upper and lower end faces of the wedge block 16 are provided with threaded holes, and the lower cover plate 9 is provided with a downward screw that is threadedly matched with the threaded hole on the lower end face of the wedge block 16. During the installation stage of the center hole former, the core shaft flap 13 is first assembled with the guide block 18, and then the guide block 18 is slidably installed in the guide block matching groove on the side wall of the wedge block 16 to form a cylinder, and the screen sleeve 14 is put on the outside of the cylinder. Then all the core shaft flaps 13 are slidably installed in the annular groove on the upper end face of the lower cover plate 9, and the wedge block 16 is moved downward by moving the screw downward to cooperate with the threaded hole on the lower end face of the wedge block 16. The downward movement of the wedge block 16 will drive the core shaft flap 13 to move radially through its own inclined surface and the cooperation of the guide block 18. When it moves to the extreme position of the annular groove, the core shaft flap 13 is fixed to the lower cover plate 9 by screws to complete the installation of the center hole former. When the center hole former is removed, the simulated lunar soil 17 has been compacted at this time, and the center hole former cannot be directly removed after removing the upper cover plate 1. At this point, it is necessary to loosen the bottom downward screw and the screws securing the mandrel petals 13, screw the downward screw into the threaded hole at the top of the wedge block 16, and use the spiral lifting force to pull out the wedge block to remove the four mandrel petals 13. After the center hole former is removed, only the screen sleeve 14 remains in the compacted simulated lunar soil.

[0046] In this embodiment, each guide block 18 is fixed to the corresponding core shaft flap 13 by screws, which is convenient for maintenance and disassembly.

[0047] In this embodiment, the screen sleeve 14 is a metal sintered filter.

[0048] In this embodiment, lifting rings are symmetrically provided on both sides of the upper end surface of the upper cover plate 1 to facilitate lifting of the tooling.

[0049] In this embodiment, the placeholder component is a threaded plug.

[0050] According to another aspect of the present invention, a method for preparing simulated lunar regolith using the above-mentioned simulated lunar regolith profile sample low-temperature shaping and defect suppression tooling is provided, characterized in that it includes the following steps:

[0051] S1. Install the threaded plug in the sampling screw sleeve 6 and install the center hole former on the lower cover plate 9;

[0052] S2. Add a certain amount of simulated lunar soil between the central hole former and the inner barrel 4 and spread it in batches. Then, use a hydraulic press or a three-dimensional vibration table to compact the simulated lunar soil 17 until the density of the compacted simulated lunar soil reaches a certain value.

[0053] S3. Turn the tool over and remove the adapter plate 8. Remove the threaded plug and the center hole former, leaving only the screen sleeve 14 in the center hole former inside the tool. Use an electric drill to drill the contact surface of the temperature sensor on the side of the lunar soil sample. Place the temperature sensor into the sampling plug 5. Install the sampling plug 5 into the sampling threaded sleeve 6. Then, introduce liquid nitrogen through the liquid nitrogen inlet pipe connected to the liquid nitrogen interface 15 to cool the sample. This completes the lunar soil preparation.

[0054] S4. Remove the temperature measuring assembly and conduct a sampling test on the lunar soil at the sampling screw sleeve 6.

[0055] The embodiments of the present invention disclosed above are intended only to illustrate the present invention. The embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Numerous modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention.

Claims

1. A low-temperature shaping and defect suppression tool for simulated lunar soil profile samples, characterized by: The invention comprises an upper cover plate (1), a barrel assembly, a sampling screw sleeve (6), a center hole former, a liquid nitrogen interface (15), a placeholder assembly, a temperature measurement assembly and simulated lunar soil (17), wherein the upper cover plate (1) is provided at the upper end of the barrel assembly, the barrel assembly comprises an outer barrel (3) and an inner barrel (4), a heat exchange cavity is provided between the outer barrel (3) and the inner barrel (4), two liquid nitrogen interfaces (15) in communication with the heat exchange cavity are provided on the outer barrel (3), a center hole former is concentrically provided in the inner barrel (4), simulated lunar soil (17) is placed between the inner barrel (4) and the center hole former, and a side wall of one side of the inner barrel (4) is formed by A plurality of sampling screw sleeves (6) are evenly distributed from top to bottom, one end of each sampling screw sleeve (6) is connected to the inner barrel (4), and the other end of each sampling screw sleeve (6) passes through the outer barrel (3) and is connected to the outside world. The center hole former is used to form a center hole in the middle of the simulated lunar soil (17) when compacting the simulated lunar soil (17); when compacting the simulated lunar soil (17), the internal thread of each sampling screw sleeve (6) is connected to the placeholder component, and when cooling the compacted simulated lunar soil (17), the internal thread of each sampling screw sleeve (6) is connected to the temperature measuring component, and the temperature measuring component is used to measure the temperature of the simulated lunar soil (17); The barrel assembly further comprises a top flange (2), a bottom flange (7), an adapter plate (8), an adjustment assembly and a lower cover plate (9); the upper ends of the outer barrel (3) and the inner barrel (4) are connected to the top flange (2); the lower ends of the outer barrel (3) and the inner barrel (4) are connected to the bottom flange (7); the upper end of the top flange (2) is connected to the upper cover plate (1); the lower end surface of the bottom flange (7) is connected to the upper end surface of the lower cover plate (9); the lower cover plate (9) is connected to the upper end surface of the adapter plate (8); the bottom flange (7) and the adapter plate (8) are both connected to the adjustment assembly; the adjustment assembly is used to fix the bottom flange (7) and the adapter plate (8); The center hole former comprises a core shaft flap (13), a screen sleeve (14), a wedge block (16) and a guide block (18). A plurality of core shaft flaps (13) are evenly distributed around the circumference of the wedge block (16). Each core shaft flap (13) is slidably arranged on the end face of the wedge block (16) at a corresponding position via a guide block (18). All core shaft flaps (13) and the wedge block (16) form a cylinder. The lower end of each core shaft flap (13) is slidably arranged on the upper end face of the lower cover plate (9). When the wedge block (16) moves downward, each core shaft flap (13) slides radially around the cylinder and, after sliding to an extreme position, the core shaft flap (13) is fixed to the lower cover plate (9) by bolts. The upper end face of the cylinder abuts against the lower end face of the upper cover plate (1). The screen sleeve (14) is arranged around the cylinder.

2. The low-temperature shaping and defect suppression tooling for simulated lunar soil profile samples according to claim 1 is characterized by: The temperature measurement component comprises a sampling plug (5) and a temperature sensor. The sampling plug (5) is threadedly connected to a sampling screw sleeve (6) at a corresponding position. An opening is provided on the sampling plug (5), and the temperature sensor is provided in the opening.

3. The low-temperature shaping and defect suppression tooling for simulated lunar soil profile samples according to claim 1 is characterized by: The adjustment assembly includes a clamping screw (10), an adjustment screw (11) and a pressure plate (12). A plurality of pressure plates (12) are evenly distributed on the circumference of the upper end surface of the bottom flange (7). Each of the pressure plates (12) is threadedly connected to the adjustment screw (11) on the side away from the outer barrel (3). The nut of the adjustment screw (11) is arranged downward and abuts against the upper end surface of the adapter plate (8). Each of the pressure plates (12) is threadedly connected to the clamping screw (10) on the side close to the outer barrel (3). Each of the clamping screws (10) is threadedly connected to the adapter plate (8).

4. The low-temperature shaping and defect suppression tooling for simulated lunar soil profile samples according to claim 1 is characterized by: The upper end surface and the lower end surface of the wedge block (16) are both provided with threaded holes, and the lower cover plate (9) is provided with a downward screw that is threadably matched with the threaded hole on the lower end surface of the wedge block (16).

5. The low-temperature shaping and defect suppression tooling for simulated lunar soil profile samples according to claim 1 is characterized by: Each guide block (18) is fixed to the corresponding core shaft flap (13) by means of screws.

6. The low-temperature shaping and defect suppression tooling for simulated lunar soil profile samples according to claim 1 is characterized by: Hanging rings are symmetrically arranged on both sides of the upper end surface of the upper cover plate (1).

7. The low-temperature shaping and defect suppression tool for simulated lunar soil profile samples according to claim 1, characterized in that: The placeholder component is a threaded plug.

8. A method for preparing simulated lunar soil using a simulated lunar soil profile sample low-temperature shaping and defect suppression tool as described in any one of claims 1 to 7, characterized in that: The following steps are involved: S1, install the placeholder assembly in the sampling screw sleeve (6) and install the center hole former on the lower cover plate (9); S2, adding a certain amount of simulated lunar soil between the central hole former and the inner barrel (4) and compacting it until the density of the compacted simulated lunar soil reaches a certain value; S3, remove the placeholder assembly and the center hole former, install the temperature measuring assembly in the sampling screw sleeve (6) and cool the inner barrel (4) to complete the lunar soil preparation; S4. Remove the temperature measuring assembly and conduct a sampling test on the lunar soil at the sampling screw sleeve (6).

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