A low-gravity environment simulated lunar soil penetration test platform and test method based on bottom friction

Abstract

The present invention discloses a low-gravity environment simulated lunar soil penetration test platform and test method based on bottom friction, belonging to the technical field of low-gravity simulation devices, including a support adjustment unit; a simulation box, in which simulated lunar soil is placed; the simulation box is arranged on the support adjustment unit; wherein the inclination angle of the simulation box is adjusted by adjusting the length of the support adjustment unit to simulate the gravity of the moon; a monitoring unit, which penetrates into the simulated lunar soil after passing through the simulation box, and monitors the penetration resistance in the simulated lunar soil. The present invention can simulate the low-gravity environment of the moon, and the method principle proposed in the present invention can also simulate the low-gravity environment on other planets; at the same time, the method proposed in the present invention can calculate the corresponding test platform inclination angle α for different lunar soil or star soil materials (different materials have different friction coefficients μ).

Description

Technical Field

[0001] The present invention belongs to the technical field of low-gravity simulation devices, and specifically relates to a low-gravity environment simulation lunar soil penetration test platform and test method based on bottom friction. Background Art

[0002] Mineral resources are the lifeblood of human social development. In recent years, with the increasing consumption of earth resources and the gradual exhaustion of some resources, the development and utilization of lunar resources has become a new commanding height of scientific and technological competition. Lunar mining must be unmanned and intelligent, so the study of lunar mining is of great significance to the development of my country's mining engineering field. Due to the vacuum and low gravity conditions of the moon, the main problems in the current research on lunar mining are how to simulate the vacuum and low gravity environment of the moon and how to explore the mechanical properties of lunar soil in a low gravity environment.

[0003] Prior art: Chinese patent, the patent name is: A low-gravity simulation device and method based on weight reduction, counterweight and inclination sensing, application number 202111412979.X. The device is relatively complex and difficult to operate. It requires the cooperation of a two-dimensional translation unit and a tilt sensing winch unit to always apply a vertical lifting force to the object. If the angle deviates slightly, it will greatly affect the low-gravity environment of the object and affect the test results. Moreover, this device has very strict requirements on the surrounding environment during simulation. If the rope swings slightly, it will also destroy the low-gravity environment in which the object is located. When the device simulates a low-gravity environment, the weight of the counterweight unit must always be much smaller than the weight of the test object. If you are not careful, it will cause the object to leave the ground, thereby forming a two-force balance in the air, making the low-gravity simulation meaningless.

[0004] Therefore, when completing some harsh low-gravity environment simulations, the simulation results obtained by this device may not be very ideal, and the device described in this technology cannot meet the requirements of the penetration test. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a low-gravity environment simulated lunar soil penetration test platform and test method based on bottom friction, and adopts the following technical solutions:

[0006] The low-gravity environment simulated lunar soil penetration test platform based on bottom friction includes:

[0007] Support adjustment unit;

[0008] A simulation box, in which simulated lunar soil is placed; the simulation box is arranged on the support adjustment unit; wherein the inclination angle of the simulation box is adjusted by adjusting the length of the support adjustment unit to simulate the gravity of the moon;

[0009] A monitoring unit is inserted into the simulated lunar soil after passing through the simulation box, and monitors the penetration resistance in the simulated lunar soil.

[0010] Further, the support adjustment unit comprises a support base and two support legs with adjustable heights; the first ends of the two support legs are respectively connected to the support base; wherein the second end of one of the support legs is rotatably connected to a main pulley, and the second end of the other support leg is rotatably connected to a slave pulley; the main pulley and the slave pulley are connected via a transmission belt;

[0011] The second end of the support leg connected to the main pulley is connected to a first driving unit, and the output end of the first driving unit is connected to the main pulley to drive the main pulley to rotate; the simulation box is placed on the conveyor belt to provide friction to the simulation box so that the simulation box remains stationary on the conveyor belt.

[0012] Furthermore, an opening is provided at one end of the simulation box that contacts the conveyor belt so that the simulated lunar soil contacts the conveyor belt.

[0013] Furthermore, the monitoring unit includes a static penetration instrument and two monitoring legs with adjustable heights; the two monitoring legs are fixedly arranged on the support seat with an interval between them; the static penetration instrument is rotatably connected to the monitoring legs, and the detection end of the static penetration instrument passes through the simulation box and penetrates into the simulated lunar soil.

[0014] Furthermore, the static penetration instrument includes a sounding frame, a sounding rod, a sounding rod guide block and a second driving unit; the sounding rod guide block is arranged in the sounding frame and connected to the sounding frame; the sounding frame is arranged on one end of the monitoring leg away from the support seat and is rotatably connected to the two monitoring legs; the second driving unit is arranged on the sounding frame; the first end of the sounding rod is connected to the output end of the second driving unit, so that the second driving unit drives the sounding rod to perform reciprocating motion; the second end of the sounding rod passes through the sounding rod guide block and extends into the simulation box, and penetrates into the simulated lunar soil.

[0015] Furthermore, the inclination angle of the conveyor belt is the same as the inclination angle of the probe frame.

[0016] Furthermore, the inclination direction of the conveyor belt is the same as the inclination direction of the feeler frame.

[0017] Furthermore, the probe rod and the conveyor belt are parallel to each other.

[0018] Furthermore, the running direction of the conveyor belt is the same as the penetration direction of the probe rod.

[0019] Furthermore, the method for simulating lunar soil penetration in a low-gravity environment based on bottom friction is characterized in that it is a test method for simulating lunar soil penetration in a low-gravity environment based on bottom friction of any of the above test platforms, and the method comprises the following steps:

[0020] S1. After placing the simulated lunar soil in the simulation box, place the simulation box on a conveyor belt, and make one end of the simulation box with an opening contact with the conveyor belt, so that the simulated lunar soil in the simulation box contacts with the conveyor belt; tilt the bottom friction test table at a certain angle α;

[0021] S2. Adjust the lengths of the two support legs. The different lengths of the two support legs form a height difference, so that the conveyor belt is tilted at a certain angle α. At the same time, start the first driving unit to rotate the conveyor belt in a counterclockwise direction, so that the gravity component force in the running direction of the conveyor belt offsets part of the friction between the simulated lunar soil and the conveyor belt;

[0022] S3, by adjusting the angle α between the conveyor belt and the ground, the gravity of the moon is formed in the running direction of the conveyor belt, so that the simulated lunar soil is in a low gravity environment;

[0023] S4. Start the second driving unit, which drives the probe rod to pass through the probe rod guide block and then extend into the simulation box, penetrate into the simulated lunar soil, and monitor the various resistances generated by the simulated lunar soil when the probe rod penetrates. Beneficial Effects

[0024] The low-gravity environment simulated lunar soil penetration test platform and test method based on bottom friction provided by the present invention are simple to operate and can meet the needs of penetration tests. The low-gravity environment of the moon can be accurately simulated and the mechanical properties of the lunar soil in the low-gravity environment can be explored only by adjusting the angle α between the conveyor belt of the bottom friction test platform and the ground. The test platform proposed in the present invention has high stability, and the simulated lunar soil is in a relatively closed environment, which is basically not disturbed or affected by other external environments. Moreover, the test platform can not only accurately simulate the magnitude of the lunar gravity, but also clearly analyze the direction of the lunar gravity.

[0025] The low-gravity environment simulated lunar soil penetration test method based on bottom friction provided by the present invention, combined with the test platform in the present invention, will also achieve a good simulation effect when conducting some other extreme low-gravity simulation tests. The test platform and test method in the present invention can serve researchers in studying lunar soil penetration type experiments, greatly facilitate the study of the properties of lunar soil on the moon, and greatly promote my country's mining technology for mineral resources on the moon. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a front view of the low-gravity environment simulated lunar soil penetration test platform based on bottom friction of the present invention;

[0027] Figure 2 A top view of the low-gravity environment simulating lunar soil penetration test platform based on bottom friction of the present invention;

[0028] Figure 3 This is a function distribution and solution range diagram of the friction coefficient of the lunar soil penetration test platform based on bottom friction and low gravity environment simulation of the present invention when it is 0.1-0.8;

[0029] Among them, 1. simulation box; 2. simulated lunar soil; 3. support seat; 4. support leg; 5. main pulley; 6. transmission belt; 7. opening; 8. monitoring leg; 9. static penetration instrument; 10. penetration frame; 11. probe rod; 12. probe rod guide block; 13. second drive unit. DETAILED DESCRIPTION

[0030] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below.

[0031] Example 1

[0032] This embodiment takes the low gravity environment of the moon as an example. Figures 1 to 3 , a low-gravity environment simulation lunar soil 2 penetration test platform based on bottom friction, including:

[0033] Support adjustment unit;

[0034] A simulation box 1, in which simulated lunar soil 2 is placed; the simulation box 1 is arranged on a support and adjustment unit; wherein the magnitude of the gravity of the moon is simulated;

[0035] A monitoring unit, which passes through the simulation box 1 and is inserted into the simulated lunar soil 2, and monitors the penetration resistance in the simulated lunar soil 2.

[0036] Through the above technical scheme, the inclination angle of the simulation box 1 is adjusted by adjusting the adjustment angle of the support adjustment unit, so that the gravity component of the simulation box 1 and the simulated lunar soil 2 offsets part of the friction force, and the simulated lunar soil 2 can be in low gravity conditions.

[0037] In this embodiment, the support adjustment unit includes a support base 3 and two support legs 4 with adjustable heights; the first ends of the two support legs 4 are respectively connected to the support base 3; wherein the second end of one support leg 4 is rotatably connected to a main pulley 5, and the second end of the other support leg 4 is rotatably connected to a slave pulley; the main pulley 5 and the slave pulley are connected via a transmission belt 6;

[0038] The support leg 4 is a telescopic structure with adjustable height, and the inclination angle of the conveyor belt 6 is adjusted by adjusting the height of the support leg 4;

[0039] The second end of the support leg 4 connected to the main pulley 5 is connected to the first driving unit, and the output end of the first driving unit is connected to the main pulley 5 to drive the main pulley to rotate; the simulation box 1 is placed on the transmission belt 6 to provide friction to the simulation box 1 so that the simulation box 1 remains stationary on the transmission belt 6.

[0040] In this embodiment, an opening 7 is provided at one end of the simulation box 1 that contacts the conveyor belt 6 so that the simulated lunar soil 2 contacts the conveyor belt 6 .

[0041] Through the above technical scheme, the support seat 3 is placed on the horizontal ground, and the support leg 4 adopts a length-adjustable structure for adjusting the angle α between the conveyor belt 6 and the ground; the conveyor belt 6 is installed on the main pulley 5 and the slave pulley, and the first driving unit drives the two pulleys 5 to rotate in the counterclockwise direction, thereby driving the conveyor belt 6 to start working in the direction consistent with the rotation direction of the main pulley 5; the simulated lunar soil 2 is placed in the simulation box 1. Since the test device always needs to rely on the bottom friction force to keep the simulated lunar soil 2 in a low gravity environment, an opening 7 is provided at the end of the simulation box 1 that contacts the conveyor belt 6, so that the simulated lunar soil 2 can directly contact the surface of the conveyor belt 6 on the bottom friction test bench; the simulation box 1 and the simulated lunar soil 2 are placed on the conveyor belt 6 of the bottom friction test bench, and the lengths of the two support legs 4 are adjusted. The different lengths of the two support legs 4 make the angle between the conveyor belt 6 and the ground α.

[0042] In this embodiment, the inclination angle of the conveyor belt 6 is the angle α between the conveyor belt 6 and the ground. The method for determining the inclination angle α is as follows:

[0043] like Figure 1 As shown, the main pulley 5 is turned on to start the conveyor belt 6; assuming that the contact area between the simulated lunar soil 2 in the simulation box 1 and the conveyor belt 6 is S, the thickness of the simulated lunar soil 2 is h, the mass of the simulation box 1 is m, the bulk density of the lunar soil is γ, and the gravity acceleration of the test site is g, when the conveyor belt 6 starts to move, according to the Saint-Venant principle, when the simulated lunar soil 2 model is thin enough, it is considered that the friction force f acts evenly on the entire thickness range of the simulated lunar soil 2 model. At this time, the simulated lunar soil 2 in the simulation box 1 is subjected to a vertical downward gravity of mg, and the upward support force perpendicular to the conveyor belt 6 is F N , the friction force in the same direction as the conveyor belt 6 is f; through the force analysis and force decomposition of the simulated lunar soil 2, it can be obtained that:

[0044]

[0045] Friction:

[0046]

[0047] At this time, the resultant force on the simulated lunar soil 2 in the direction of the conveyor belt is:

[0048]

[0049] in,

[0050] Assuming that the lunar environment gravity is G' and the gravitational acceleration is g', the resultant force on the simulated lunar soil 2 in the direction of the conveyor belt movement should be the lunar environment gravity, so:

[0051]

[0052] Therefore, through calculation, we can get:

[0053]

[0054] Assume that the lunar gravity is When, that is:

[0055]

[0056] Divide g on both sides of the equation and simplify to get:

[0057]

[0058] Therefore, it can be seen that the lunar gravity environment simulation problem can be converted into finding μ and α that meet the above conditions, so we can construct the function :

[0059]

[0060] Then the lunar gravity environment simulation problem is finally transformed into finding That's it.

[0061] at this time, , , α is the angle between the conveyor belt 6 and the ground, the minimum value is 0, that is, the conveyor belt 6 is parallel to the ground, and the maximum value is π / 2, but the value π / 2 cannot be taken, because when the value is π / 2, the conveyor belt 6 is perpendicular to the ground, which will affect the bottom friction of the simulated lunar soil 2, and thus the low gravity environment of the moon cannot be achieved.

[0062] μ is the dynamic friction coefficient of the conveyor belt. Different conveyor belts may have different dynamic friction coefficients, but the dynamic friction coefficients of conveyor belts are generally within this range, so the value of μ is also within a range. Finally, by calculating The function cluster distribution when Figure 3 shown.

[0063] Figure 3 The horizontal coordinate is α and the vertical coordinate is , the shaded area is the range of μ=0.1-0.8, so the solution set needs to be found in the shaded area. The α angle value, so the α value in the red range is the value that satisfies the simulated gravity environment. The requirement, that is That is, α has values ​​that meet the conditions within this range, but the specific angle needs to be determined based on the value of the dynamic friction coefficient μ of the conveyor belt 6. That is to say, the dynamic friction coefficient of the conveyor belt 6 needs to be known in advance before the test, and then the dynamic friction coefficient μ of the conveyor belt 6 can be used to determine the angle. Figure 2 The value of α is obtained, and the angle α between the conveyor belt 6 and the ground on the bottom friction test bench is adjusted according to the value of α, so as to simulate the gravity of the moon.

[0064] Finally, since the direction of the resultant force F acting on the simulated lunar soil 2 is obliquely upward along the direction of operation of the conveyor belt 6, this direction is the direction of the gravity of the moon. The magnitude of gravity has been accurately simulated by adjusting the angle α, so the static penetration instrument 9 is also maintained in this direction. On this basis, the static penetration instrument 9 is arranged at the bottom of the model, and the probe is penetrated into the simulated lunar soil 2 along a direction parallel to the conveyor belt 6. Through this operation, the low-gravity simulated lunar soil 2 penetration test based on the bottom friction method can be realized.

[0065] In this embodiment, the monitoring unit includes a static penetration instrument 9 and two monitoring legs 8 with adjustable heights; the two monitoring legs 8 are fixedly arranged on a support base 3 with an interval between them; the static penetration instrument 9 is rotatably connected to the monitoring legs 8, and the detection end of the static penetration instrument 9 passes through the simulation box 1 and penetrates into the simulated lunar soil 2.

[0066] The two monitoring legs 8 are telescopic structures with adjustable heights, and the tilt angle of the static penetration instrument 9 is adjusted by adjusting the height of the monitoring legs 8 .

[0067] In this embodiment, the static penetration instrument 9 includes a penetration frame 10, a probe rod 11, a probe rod guide block 12 and a second driving unit 13; the probe rod guide block 12 is arranged in the penetration frame 10 and connected to the penetration frame 10; the penetration frame 10 is arranged on the end of the monitoring leg 8 away from the support seat 3, and is rotatably connected to the two monitoring legs 8; the second driving unit 13 is arranged on the penetration frame 10; the first end of the probe rod 11 is connected to the output end of the second driving unit 13, so that the second driving unit 13 drives the probe rod to reciprocate; the second end of the probe rod passes through the probe rod guide block and extends into the simulation box and penetrates into the simulated lunar soil.

[0068] In this embodiment, the inclination angle of the conveyor belt 6 and the inclination angle of the feeler frame 10 are the same.

[0069] In this embodiment, the inclination direction of the conveyor belt 6 is the same as the inclination direction of the feeler frame 10 .

[0070] In this embodiment, the probe rod 11 and the conveyor belt 6 are parallel to each other.

[0071] In this embodiment, the running direction of the conveyor belt 6 is the same as the penetration direction of the probe rod 11, that is, the movement direction of the side of the conveyor belt 6 in contact with the simulation box 1 is the same as the penetration direction of the probe rod 11, so that the direction of the resultant force of the simulated lunar soil is the direction of gravity exerted on the simulated lunar soil.

[0072] Example 2

[0073] In this embodiment, the low-gravity environment simulated lunar soil penetration test method based on bottom friction is the test method of the low-gravity environment simulated lunar soil penetration test platform based on bottom friction in Example 1, and the method includes the following steps:

[0074] S1. After placing the simulated lunar soil 2 in the simulation box 1, place the simulation box 1 on the conveyor belt 6, and one end of the simulation box 1 provided with an opening 7 contacts the conveyor belt 6, so that the simulated lunar soil 2 in the simulation box 1 contacts the conveyor belt 6; tilt the bottom friction test bench at a certain angle α;

[0075] S2. Adjust the lengths of the two support legs 4. The different lengths of the two support legs 4 form a height difference, so that the conveyor belt 6 is tilted at a certain angle α. At the same time, start the first driving unit to rotate the conveyor belt in a counterclockwise direction, so that the gravity component force in the running direction of the conveyor belt 6 offsets part of the friction between the simulated lunar soil 2 and the conveyor belt 6;

[0076] S3, by adjusting the angle α between the conveyor belt 6 and the ground, the gravity of the moon is formed in the running direction of the conveyor belt, so that the simulated lunar soil 2 is in a low gravity environment;

[0077] S4. Start the second driving unit 13. The second driving unit 13 drives the probe rod 11 to pass through the probe rod guide block 12 and the probe frame 10 in sequence and then extend into the simulation box 1, penetrate into the simulated lunar soil 2, and monitor the various resistances generated by the simulated lunar soil 2 when the probe rod 11 penetrates.

[0078] Through the above technical scheme, the magnitude and direction of the lunar gravity are restored more accurately, and the low gravity environment of the moon is simulated more realistically; the present invention can simulate the low gravity environment of the moon, and the method principle proposed in the present invention can also simulate the low gravity environment on other planets; at the same time, the method proposed in the present invention can calculate the corresponding test bench inclination angle α for different lunar soil or star soil materials (different materials have different friction coefficients μ).

[0079] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A low-gravity environment simulated lunar soil penetration test platform based on bottom friction, characterized by: include: A simulation box, in which simulated lunar soil is placed; The simulation box is arranged on a support adjustment unit; wherein the inclination angle of the simulation box is adjusted by adjusting the length of the support adjustment unit to simulate the gravity of the moon; The support adjustment unit comprises a support seat and two support legs with adjustable heights; the first ends of the two support legs are respectively connected to the support seat; wherein the second end of one of the support legs is rotatably connected to a main pulley, and the second end of the other support leg is rotatably connected to a slave pulley; the main pulley and the slave pulley are connected via a transmission belt; the second end of the support leg connected to the main pulley is connected to a first driving part, and the output end of the first driving part is connected to the main pulley to drive the main pulley to rotate; the simulation box is placed on the transmission belt to provide friction to the simulation box so that the simulation box remains stationary on the transmission belt; A monitoring unit, wherein the monitoring unit is inserted into the simulated lunar soil after passing through the simulation box, and monitors the penetration resistance in the simulated lunar soil; the monitoring unit comprises a static penetration instrument and two monitoring legs with adjustable heights; the two monitoring legs are fixedly arranged on the support seat with an interval between them; the static penetration instrument is rotatably connected to the monitoring legs, and the detection end of the static penetration instrument passes through the simulation box and penetrates into the simulated lunar soil; A method for simulating lunar soil penetration in a low-gravity environment based on bottom friction, the method is a test method for a test platform for simulating lunar soil penetration in a low-gravity environment based on bottom friction, and the method comprises the following steps: S1. After placing the simulated lunar soil in the simulation box, place the simulation box on a conveyor belt, and make one end of the simulation box with an opening contact with the conveyor belt, so that the simulated lunar soil in the simulation box contacts with the conveyor belt; tilt the bottom friction test table at a certain angle α; S2. Adjust the lengths of the two support legs. The different lengths of the two support legs form a height difference, so that the conveyor belt is tilted at a certain angle α. At the same time, start the first driving unit to rotate the conveyor belt in a counterclockwise direction, so that the gravity component force in the running direction of the conveyor belt offsets part of the friction between the simulated lunar soil and the conveyor belt; S3, by adjusting the angle α between the conveyor belt and the ground, the gravity of the moon is formed in the running direction of the conveyor belt, so that the simulated lunar soil is in a low gravity environment; S4. Start the second driving unit, which drives the probe rod to pass through the probe rod guide block and then extend into the simulation box, penetrate into the simulated lunar soil, and monitor the various resistances generated by the simulated lunar soil when the probe rod penetrates.

2. The low-gravity environment simulated lunar soil penetration test platform based on bottom friction according to claim 1 is characterized in that: An opening is provided at one end of the simulation box that contacts the conveyor belt so that the simulated lunar soil contacts the conveyor belt.

3. The low-gravity environment simulated lunar soil penetration test platform based on bottom friction according to claim 1 is characterized in that: The static penetration instrument includes a penetration frame, a penetration rod, a penetration rod guide block and a second driving unit; the penetration rod guide block is arranged in the penetration frame and connected to the penetration frame; the penetration frame is arranged on one end of the monitoring leg away from the support seat and is rotatably connected to the two monitoring legs; the second driving unit is arranged on the penetration frame; the first end of the penetration rod is connected to the output end of the second driving unit, so that the second driving unit drives the penetration rod to reciprocate; the second end of the penetration rod passes through the penetration rod guide block and extends into the simulation box, and penetrates into the simulated lunar soil.

4. The low-gravity environment simulated lunar soil penetration test platform based on bottom friction according to claim 3 is characterized in that: The inclination angle of the conveyor belt is the same as the inclination angle of the feeler frame.

5. The low-gravity environment simulated lunar soil penetration test platform based on bottom friction according to claim 3 is characterized in that: The inclination direction of the conveyor belt is the same as the inclination direction of the feeler frame.

6. The low-gravity environment simulated lunar soil penetration test platform based on bottom friction according to claim 3 is characterized in that: The probe rod and the conveyor belt are parallel to each other.

7. The low-gravity environment simulated lunar soil penetration test platform based on bottom friction according to claim 3 is characterized in that: The running direction of the conveyor belt is the same as the penetration direction of the probe rod.

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