A screw drive continuous in-situ sampling and encapsulation device for lunar soil

Abstract

A spiral drive continuous in-situ sampling and encapsulation device for lunar soil belongs to the field of aerospace technology. The present invention solves the problem that the existing in-situ sampling and detection devices cannot accurately control the sampling amount and particle size distribution. The upper end of the spline shaft is rotatably connected to the support tube through a bearing assembly. The threaded spline push block is slidably mounted on the spline shaft along the axial direction of the spline shaft, and the threaded spline push block is threadedly connected to the inner wall of the support tube. A through hole is radially formed in the lower part of the spline shaft. The positioning leaf spring is inserted into the through hole and its upper end is fixedly connected to the spline shaft. The dust-proof plug is inserted into the lower end of the support tube. The suction sheet is coaxially sleeved on the lower part of the spline shaft and the dust-proof plug is located between the support tube and the suction sheet. A first annular groove is coaxially formed on one end face of the rotary cutting sheet, and a second annular groove is coaxially formed on one end face of the constant volume pressing cover. The constant volume pressing cover is buckled in the first annular groove.

Description

Technical Field

[0001] The present invention relates to a spiral drive continuous in-situ lunar soil sampling and encapsulation device, belonging to the field of aerospace technology. Background Art

[0002] The moon is the only natural satellite of the earth. Due to its unique natural environment and mineral resources, it has become the main target for human exploration of celestial bodies. According to the differences in detection methods, there are types such as remote sensing detection, sampling return analysis, and in-situ sampling detection. Compared with the problems of pollution prevention and control of the returned objects and the relatively high engineering cost 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 a lunar lander or a rover landing on the moon, and uses sampling tools to obtain surface or subsurface lunar soil samples and transfer them to an analysis instrument for on-site analysis. However, the existing in-situ sampling detection devices generally adopt the methods of drilling and coring and surface shoveling, and neither can accurately control the sampling volume and particle size distribution. Summary of the Invention

[0003] The present invention is to solve the problem that the existing in-situ sampling detection device cannot accurately control the sampling volume and particle size distribution, and further provides a spiral drive continuous in-situ lunar soil sampling and encapsulation device.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] A screw drive continuous in-situ sampling and encapsulation device for lunar soil, which includes a support tube, a spline shaft, a threaded spline push block, a positioning leaf spring, a suction sheet and a dust plug. Among them, an internal thread is machined in the support tube, the spline shaft is coaxially installed in the support tube, and the upper end of the spline shaft is rotatably connected to the support tube through a bearing assembly. The threaded spline push block is slidably installed on the spline shaft along the axial direction of the spline shaft, and the threaded spline push block is threadedly connected to the inner wall of the support tube. A through hole is radially opened in the lower part of the spline shaft, the positioning leaf spring is inserted into the through hole and its upper end is fixedly connected to the spline shaft. The dust plug is inserted into the lower end of the support tube, and the suction sheet is coaxially sleeved on the lower part of the spline shaft and the dust plug is located between the support tube and the suction sheet. Among them, the suction sheet includes a rotary slice and a constant volume pressing cover that are both of annular structures. A first annular groove is coaxially opened on one end face of the rotary slice, and a second annular groove is coaxially opened on one end face of the constant volume pressing cover. The constant volume pressing cover is buckled in the first annular groove. A plurality of obliquely arranged sampling channels are fixedly arranged on the other end face of the rotary slice, and the sampling channels are communicated with the second annular groove through a plurality of communication holes opened on the rotary slice. A cutting edge is machined at the inlet end of the sampling channel. Two limiting blocks are relatively fixedly arranged on one side surface of the rotary slice that cooperates with the spline shaft, and limiting card slots are relatively opened on the two limiting blocks. The suction sheet is slidably arranged along the axial direction of the spline shaft through the two limiting blocks. Two relatively arranged wedge-shaped blocks are machined at the lower end of the positioning leaf spring, and the wedge-shaped blocks are correspondingly clamped in the lowermost limiting card slot.

[0006] Further, a thermistor is installed at the lower end of the support tube.

[0007] Further, a limiting retaining ring is coaxially and fixedly arranged on the upper part of the spline shaft, and the bearing assembly realizes axial limitation of the bearing assembly on the spline shaft through the limiting retaining ring and the bearing end cover.

[0008] Further, a limiting shoulder is machined on the inner wall of the upper part of the support tube. A dust-proof outer ring is arranged between the outer ring of the bearing and the limiting shoulder, a dust-proof inner ring is arranged between the inner ring of the bearing and the limiting retaining ring, and an axial sealing ring is arranged between the dust-proof outer ring and the dust-proof inner ring.

[0009] Further, a spiral grid is machined on the inner wall of the dust plug.

[0010] Further, the dust plug includes an annular cover plate and a plurality of elastic pieces fixedly arranged circumferentially at one end of the annular cover plate. Among them, the annular cover plate is arranged at the lower end of the support tube, and the plurality of elastic pieces are inserted between the support tube and the suction sheet.

[0011] Further, a dust-containing groove is machined on the outer surface of the threaded spline push block.

[0012] Further, the diameter of the communication hole is set to be smaller than the width of the second annular groove.

[0013] Furthermore, a number of lightweight holes are evenly distributed on the spline shaft.

[0014] Furthermore, the number of the absorption sheets is at least one.

[0015] The present invention has the following effects compared with the prior art:

[0016] When the driving motor rotates forward, the driving force is transmitted to the spline shaft through the flat key by the motor output shaft, the threaded spline push block moves axially upward, and the spline shaft transmits the power to the absorption sheet to realize the rotary cutting sampling of the absorption sheet.

[0017] When the driving motor rotates in reverse, the threaded spline push block moves axially downward, pushing the absorption sheet to move axially downward. The limit block on the absorption sheet presses the positioning leaf spring to release the axial limit of the lowermost absorption sheet and push out the lowermost absorption sheet. At the same time, the next absorption sheet enters the axial limit state, that is, the positioning leaf spring is clamped in the limit card slot of the next absorption sheet, thereby realizing the function of assisting in pushing the sheet.

[0018] The rotary cutting piece and the constant volume pressing cover together form a sampling cavity, and the volume of the sampled lunar soil is controlled by the sampling cavity to realize quantitative sampling.

[0019] By controlling the aperture of the sample injection channel, the sample injection channel has a screening function, which can ensure that the particle size of the lunar soil in the sampling cavity is controlled within the set range. Fixed particle size sampling is realized. Description of the Drawings

[0020] Figure 1 It is a semi-sectional view schematic diagram of the screw drive continuous lunar soil in-situ sampling and encapsulation device of the present application;

[0021] Figure 2 It is a lower part enlarged view schematic diagram (semi-sectional view) of the screw drive continuous lunar soil in-situ sampling and encapsulation device of the present application;

[0022] Figure 3 It is an upper part enlarged view schematic diagram (semi-sectional view) of the screw drive continuous lunar soil in-situ sampling and encapsulation device of the present application;

[0023] Figure 4 It is a lower part enlarged view schematic diagram of the screw drive continuous lunar soil in-situ sampling and encapsulation device of the present application;

[0024] Figure 5 It is a lower part enlarged view schematic diagram of the support tube;

[0025] Figure 6 It is a three-dimensional structure schematic diagram of the dust-proof plug;

[0026] Figure 7 It is a three-dimensional structure schematic diagram of the absorption sheet;

[0027] Figure 8 Semi-sectional view schematic diagram of the absorption sheet;

[0028] Figure 9 First three-dimensional structure schematic diagram of the rotary cutting sheet;

[0029] Figure 10 Second three-dimensional structure schematic diagram of the rotary cutting sheet;

[0030] Figure 11 Three-dimensional structure schematic diagram of the constant volume gland;

[0031] Figure 12 Schematic diagram of some parts cooperating with the spline shaft;

[0032] Figure 13 Three-dimensional structure schematic diagram of the positioning leaf spring. Specific implementation mode

[0033] Specific implementation mode one: Combine Figures 1 to 13 To illustrate this implementation mode, a screw drive continuous in-situ sampling and encapsulation device for lunar soil includes a support tube 1, a spline shaft 2, a threaded spline push block 3, a positioning leaf spring 4, an absorption sheet 5 and a dust plug 6. Among them, an internal thread is processed in the support tube 1, the spline shaft 2 is coaxially installed in the support tube 1, and the upper end of the spline shaft 2 is rotatably connected to the support tube 1 through a bearing assembly 7. The threaded spline push block 3 is axially slidably installed on the spline shaft 2 along the axial direction of the spline shaft 2, and the threaded spline push block 3 is threadedly connected to the inner wall of the support tube 1. A limiting through hole 2-1 is axially opened in the lower part of the spline shaft 2 along its radial direction. The positioning leaf spring 4 is inserted into the limiting through hole 2-1 and its upper end is fixedly connected to the spline shaft 2. The dust plug 6 is inserted into the lower end of the support tube 1. The absorption sheet 5 is coaxially sleeved on the lower part of the spline shaft 2 and the dust plug 6 is located between the support tube 1 and the absorption sheet 5. Among them, the absorption sheet 5 includes a rotary cutting sheet 5-1 and a constant volume gland 5-2, both of which are annular structures. A first annular groove 5-11 is coaxially opened on one end face of the rotary cutting sheet 5-1. A second annular groove 5-21 is coaxially opened on one end face of the constant volume gland 5-2. The constant volume gland 5-2 is buckled in the first annular groove 5-11. A plurality of obliquely arranged sampling channels 5-12 are fixedly arranged on the other end face of the rotary cutting sheet 5-1, and the sampling channels 5-12 are communicated with the second annular groove 5-21 through a plurality of communication holes 5-13 opened on the rotary cutting sheet 5-1. The inlet end of the sampling channel 5-12 is processed with a cutting edge. Two limiting blocks 5-3 are relatively fixedly arranged on the side surface of the rotary cutting sheet 5-1 that cooperates with the spline shaft 2, and limiting card slots 5-31 are relatively opened on the two limiting blocks 5-3. The absorption sheet 5 is axially slidably arranged on the spline shaft 2 through the two limiting blocks 5-3. Two relatively arranged wedge-shaped clamping blocks 4-1 are processed at the lower end of the positioning leaf spring 4, and the wedge-shaped clamping blocks 4-1 are correspondingly clamped in the lowermost limiting card slot 5-31.

[0034] Taking the support tube as an example to illustrate the positions referred to by the upper end and the lower end in the present application, one end of the support tube where the bearing assembly is installed is the upper end, and one end of the support tube where the absorption sheet is installed is the lower end.

[0035] The threaded spline push block 3 and the absorption sheet 5 are both slidably installed on the spline shaft 2 along the spline groove on the spline shaft 2. The number of absorption sheets 5 installed on the spline shaft 2 is selected according to actual needs.

[0036] The limiting block 5-3 on the absorption sheet 5, which is the spline, is used to realize the sliding connection between the absorption sheet 5 and the spline shaft 2.

[0037] The upper end of the positioning leaf spring 4 is fixedly connected to the spline shaft 2 through a pin shaft 8.

[0038] The circumferential position of the lowermost absorption sheet 5 is determined by the spline groove, and the axial position is determined by the wedge-shaped block 4-1 on the positioning leaf spring 4, so as to ensure the position and attitude of the absorption sheet 5.

[0039] The number of communication holes 5-13 is the same as that of the sample injection channels 5-12 and they are arranged in one-to-one correspondence.

[0040] The limiting through hole 2-1 on the spline shaft 2 is communicated with the spline groove thereon.

[0041] There are two axially movable parts in the whole sampling encapsulator, namely the absorption sheet 5 and the threaded spline push block 3.

[0042] The spline shaft 2 and the absorption sheet 5 form a rotary transmission assembly. The flat key 9 is installed in the internal key groove at the upper end of the spline shaft 2. When the driving motor rotates forward, the motor output shaft transmits the driving force to the spline shaft 2 through the flat key 9, the threaded spline push block 3 moves axially upward, and the spline shaft 2 transmits the power to the absorption sheet 5 to realize the rotary cutting sampling of the absorption sheet 5. Therefore, a certain length needs to be reserved in the support tube 1 to ensure the axial upward movement of the threaded spline push block 3.

[0043] The circumferential position of the absorption sheet 5 is determined by the spline groove, and the axial position is determined by the wedge-shaped block 4-1 on the positioning leaf spring 4.

[0044] The support tube 1, the threaded spline push block 3 and the spline shaft 2 form a linear drive assembly. The support tube 1 serves as a frame and is relatively fixed. The spline drive between the threaded spline push block 3 and the spline shaft 2, and the screw drive between the threaded spline push block 3 and the support tube 1 together achieve the axial linear motion of the threaded spline push block 3. When the drive motor rotates in reverse, the threaded spline push block 3 moves axially downward, pushing the suction sheet 5 to move axially downward. The limit block 5-3 on the suction sheet 5 presses the positioning leaf spring 4, releasing the axial limit of the lowermost suction sheet 5 and pushing out the lowermost suction sheet 5. At the same time, the next suction sheet 5 enters the axial limit state, that is, the positioning leaf spring 4 is clamped in the limit card slot 5-31 of the next suction sheet 5, thereby realizing the function of assisting in pushing the sheet.

[0045] The rotary cutting piece 5-1 and the constant volume pressing cover 5-2 together form a sampling cavity 10. The volume of the sampled lunar soil is controlled by the sampling cavity 10 to achieve quantitative sampling.

[0046] After the lunar soil is subjected to the cutting action of the cutting edge, it enters the sampling cavity 10 along the sample inlet channel 5-12.

[0047] By controlling the aperture of the sample inlet channel 5-12, the sample inlet channel 5-12 has a screening function, which can ensure that the particle size of the lunar soil in the sampling cavity 10 is controlled within the set range. To achieve sampling with a fixed particle size. By controlling the filling pressure continuously present at the bottom suction surface during sampling, sampling with a fixed density is achieved.

[0048] The sample inlet channel 5-12 is obliquely arranged to achieve rotary cutting.

[0049] Through the sampling encapsulator of the present application, on the basis of the in-situ sampling function, the functions of assisting in pushing the sheet, quantitative sampling, and sampling with a fixed particle size can be achieved.

[0050] A dust-proof gap is provided between the positioning leaf spring 4 and the inner wall of the limit through-hole 2-1. Among them, the gap between the lower end of the positioning leaf spring 4 and the inner wall of the limit through-hole 2-1 is a large dust-containing gap, which effectively ensures the dust-proof performance of the sampler outlet. The gaps between the two side surfaces of the positioning leaf spring 4 and the inner wall of the limit through-hole 2-1 effectively reduce the pushing resistance of the suction sheet 5.

[0051] A thermistor 11 is installed at the lower end of the support tube 1. With such a design, by installing the thermistor 11, the function of touch temperature detection is achieved. And because the support tube 1 is fixedly connected to the sampler and there is no additional moving line problem, the in-situ temperature measurement function can be achieved. Preferably, the thermistor 11 is 1 mm away from the end of the sampling encapsulator. When the sampling encapsulator is pressed down to the lunar surface, the depth of penetration into the lunar surface is 3-20 mm. The thermistor 11 penetrates into the lunar soil, and the temperature of the lunar soil is measured through heat conduction.

[0052] A limiting retaining ring 2-2 is coaxially and fixedly arranged on the upper part of the spline shaft 2, and the bearing assembly 7 realizes the axial limit of the bearing assembly 7 on the spline shaft 2 through the limiting retaining ring 2-2 and the bearing end cover 12. With such a design, the bearing end cover 12 is installed on the top end of the spline shaft 2 through the hexagon socket head cap screws 13 to fix the bearing assembly 7. The bearing assembly 7 includes two 71902C bearings arranged face to face. The outer ring of the bearing is fixed through the spacer sleeve 14.

[0053] A limiting shoulder 1-1 is machined on the inner wall of the upper part of the support tube 1. A dust-proof outer ring 15 is arranged between the outer ring of the bearing and the limiting shoulder 1-1, a dust-proof inner ring 16 is arranged between the inner ring of the bearing and the limiting retaining ring 2-2, and an axial sealing ring 17 is arranged between the dust-proof outer ring 15 and the dust-proof inner ring 16. With such a design, the dust-proof outer ring 15, the axial sealing ring 17 and the dust-proof inner ring 16 serve as an axial constant-pressure dust-proof assembly to ensure the dust-proof effect at the bearing end.

[0054] A spiral grid 6-1 is machined on the inner wall of the dust-proof plug 6. With such a design, the lunar soil that has invaded the encapsulator can be effectively excluded outward through the spiral grid 6-1.

[0055] The dust-proof plug 6 includes an annular cover plate 6-2 and a plurality of elastic pieces 6-3 circumferentially fixed at one end of the annular cover plate 6-2. The annular cover plate 6-2 is arranged at the lower end of the support tube 1, and the plurality of elastic pieces 6-3 are inserted between the support tube 1 and the absorption sheet 5. With such a design, by arranging the plurality of elastic pieces 6-3, it is convenient for the installation and disassembly of the dust-proof plug 6. The end sealing is realized through the annular cover plate 6-2 to reduce the intrusion of lunar dust.

[0056] A dust-containing groove 3-1 is machined on the outer surface of the threaded spline push block 3. With such a design, the pushing resistance of the absorption sheet 5 is further reduced, and then the dust-containing function of the sampling encapsulator is realized.

[0057] The diameter of the communication hole 5-13 is set to be smaller than the width of the second annular groove 5-21. With such a design, it is prevented that the lunar soil enters the space in the rotary slice 5-1 other than the constant-volume pressing cover 5-2, ensuring that the lunar soil is only sampled into the sampling cavity 10 to further ensure the realization of quantitative sampling.

[0058] A plurality of lightweight holes 2-3 are evenly distributed on the spline shaft 2. With such a design, through the lightweight holes 2-3, on the premise of ensuring the mechanical properties, the self-weight of the spline shaft 2 is greatly reduced, the structure of the sampling encapsulator is optimized, and lightweight is realized.

[0059] The number of the absorption sheets 5 is at least one. The absorption sheet 5 in this application can be but is not limited to 36 sheets.

Claims

1. A screw drive continuous in-situ sampling and encapsulator for lunar soil, characterized in that: It includes a support tube (1), a spline shaft (2), a threaded spline push block (3), a positioning leaf spring (4), a suction sheet (5) and a dust plug (6). Among them, an internal thread is machined in the support tube (1), the spline shaft (2) is coaxially installed in the support tube (1), and the upper end of the spline shaft (2) is rotatably connected to the support tube (1) through a bearing assembly (7). The threaded spline push block (3) is slidably installed on the spline shaft (2) along the axial direction of the spline shaft (2), and the threaded spline push block (3) is threadedly connected to the inner wall of the support tube (1). A limiting through hole (2-1) is radially opened in the lower part of the spline shaft (2). The positioning leaf spring (4) is inserted into the limiting through hole (2-1) and its upper end is fixedly connected to the spline shaft (2). The dust plug (6) is inserted into the lower end of the support tube (1). The suction sheet (5) is coaxially sleeved on the lower part of the spline shaft (2), and the dust plug (6) is located between the support tube (1) and the suction sheet (5). Among them, the suction sheet (5) includes a rotary slice (5-1) and a constant-volume pressing cover (5-2) both of which are annular structures. A first annular groove (5-11) is coaxially opened on one end face of the rotary slice (5-1). A second annular groove (5-21) is coaxially opened on one end face of the constant-volume pressing cover (5-2). The constant-volume pressing cover (5-2) is buckled in the first annular groove (5-11). A plurality of obliquely arranged sampling channels (5-12) are fixedly arranged on the other end face of the rotary slice (5-1), and the sampling channels (5-12) are communicated with the second annular groove (5-21) through a plurality of communication holes (5-13) opened on the rotary slice (5-1). The inlet end of the sampling channel (5-12) is machined with a cutting edge. Two limiting blocks (5-3) are relatively fixedly arranged on one side surface of the rotary slice (5-1) that cooperates with the spline shaft (2), and limiting card slots (5-31) are relatively opened on the two limiting blocks (5-3). The suction sheet (5) is slidably arranged along the axial direction of the spline shaft (2) through the two limiting blocks (5-3). Two relatively arranged wedge-shaped clamping blocks (4-1) are machined at the lower end of the positioning leaf spring (4), and the wedge-shaped clamping blocks (4-1) are correspondingly clamped in the lowermost limiting card slot (5-31).

2. A screw drive continuous in-situ sampling and encapsulator for lunar soil according to claim 1, characterized in that: A thermistor (11) is installed at the lower end of the support tube (1).

3. A screw drive continuous in-situ sampling and encapsulator for lunar soil according to claim 1 or 2, characterized in that: A limiting retaining ring (2-2) is coaxially fixedly arranged on the upper part of the spline shaft (2), and the bearing assembly (7) realizes the axial limit of the bearing assembly (7) on the spline shaft (2) through the limiting retaining ring (2-2) and the bearing end cover (12).

4. A screw drive continuous in-situ sampling and encapsulator for lunar soil according to claim 3, characterized in that: The upper inner wall of the support tube (1) is machined with a limiting shoulder (1-1). A dust-proof outer ring (15) is arranged between the outer ring of the bearing and the limiting shoulder (1-1). A dust-proof inner ring (16) is arranged between the inner ring of the bearing and the limiting retaining ring (2-2). An axial sealing ring (17) is arranged between the dust-proof outer ring (15) and the dust-proof inner ring (16).

5. A screw drive continuous in-situ sampling and encapsulation device for lunar soil according to claim 1, 2 or 4, characterized in that: The inner wall of the dust-proof plug (6) is machined with spiral grids (6-1).

6. A screw drive continuous in-situ sampling and encapsulation device for lunar soil according to claim 5, characterized in that: The dust-proof plug (6) includes an annular cover plate (6-2) and a plurality of elastic pieces (6-3) circumferentially fixed at one end of the annular cover plate (6-2). The annular cover plate (6-2) is arranged at the lower end of the support tube (1), and the plurality of elastic pieces (6-3) are inserted between the support tube (1) and the absorption sheet (5).

7. A screw drive continuous in-situ sampling and encapsulation device for lunar soil according to claim 1, 2, 4 or 6, characterized in that: The outer surface of the threaded spline push block (3) is machined with a dust-containing groove (3-1).

8. A screw drive continuous in-situ sampling and encapsulation device for lunar soil according to claim 1, 2, 4 or 6, characterized in that: The diameter of the communication hole (5-13) is set to be smaller than the width of the second annular groove (5-21).

9. A screw drive continuous in-situ sampling and encapsulation device for lunar soil according to claim 1, 2, 4 or 6, characterized in that: A plurality of lightweight holes (2-3) are evenly distributed on the spline shaft (2).

10. A screw drive continuous in-situ sampling and encapsulation device for lunar soil according to claim 1, characterized in that: The number of the absorption sheets (5) is at least one.

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