A lunar soil screening-electrostatic conveying load device and method for lunar surface construction

Abstract

The application discloses a lunar soil screening-static electricity conveying load device and method for lunar surface construction, mainly comprising a load frame, a first-stage vibrating screen structure, a second-stage dispersion structure, a static electricity conveying structure and a power module, and realizes in-situ screening, conveying and waste dumping integration operation of lunar soil particle raw materials; the first-stage vibrating screen structure obtains the lunar soil particle raw materials meeting the particle size requirement through the vibrating screen mode, stores the screened particles in the second-stage dispersion structure, and dumps the waste out of the device; a certain amount of particles are stored in the second-stage dispersion structure to ensure the printing continuity within a certain time, and the bottom screen mesh can ensure that the agglomerated lunar soil powder is dispersed into the static electricity conveying structure; the static electricity conveying structure controls the lunar soil particles to realize directional movement through the static electricity field, and has a certain initial speed at the outlet end of the static electricity conveying structure, so that the low lunar gravity suspension problem of the lunar soil is overcome, and the lunar soil accurately reaches the conveying target.

Description

Technical Field

[0001] This invention relates to the field of lunar in-situ construction / manufacturing technology, and in particular to a lunar soil screening-electrostatic transport load device for lunar surface construction. Background Technology

[0002] Lunar manufacturing and construction is one of the key experimental tasks of my country's lunar research station and the foundation for future lunar base construction. To this end, it is planned to carry out in-situ utilization of lunar resources and pilot verification of key technologies. Breakthroughs in related technologies will support my country's great dream of long-term lunar presence.

[0003] Currently, research on lunar surface construction / manufacturing technologies both domestically and internationally is in its early stages, with several technical routes including lunar soil concrete extrusion, lunar soil bonding molding, and lunar soil sintering / melting molding. Among these, solar-powered sintering / melting molding technology using in-situ lunar soil has the advantage of obtaining both raw materials and energy on-site on the lunar surface, and can achieve diverse structural shapes, making it an important means of in-situ manufacturing / construction of key functional components. This technology mainly involves two key engineering processes in the 3D printing process: material supply and molding. Lunar soil powder supply is the foundation of lunar soil printing molding. Due to the wide particle size distribution of lunar soil, the printing process first requires selecting lunar soil powder with a suitable particle size. Secondly, due to the irregular structure, complex gradation, charge, and agglomeration characteristics of lunar soil particles, the uniformity of powder spreading and the density of layering are greatly challenged in the low gravity and high vacuum environment of the lunar surface. Traditional powder feeding methods such as mechanical transmission and rotation also face problems such as agglomeration, wall adhesion, and blockage, and pneumatic powder feeding methods are also difficult to apply in the high vacuum environment of the lunar surface. Therefore, it is necessary to develop a method, system, and payload device for the integrated screening and pretreatment of lunar soil and powder transportation under lunar surface conditions, to support the verification of my country's in-situ resource utilization technology on the lunar surface and the construction of future bases. Summary of the Invention

[0004] The technical problem solved by this invention is: addressing the urgent need for breakthroughs in lunar soil 3D printing technology, and overcoming the shortcomings of existing technologies in the pretreatment and transportation of special lunar soil raw materials under extreme lunar environment, this invention provides a lunar soil screening-electrostatic conveying load device and method for lunar surface construction. This device and method can achieve integrated implementation of lunar soil screening pretreatment and powder conveying, and can be used to further conduct lunar surface technology verification and promote technological progress.

[0005] The technical solution of the present invention is: a lunar soil screening-electrostatic transport load device for construction on the lunar surface, comprising a primary vibrating screen structure, a secondary dispersion structure, an electrostatic transport structure, and a power module;

[0006] The primary vibrating screen structure uses a vibrating screen method to obtain lunar soil particles that meet the particle size requirements, stores them in the secondary dispersion structure, and dumps lunar soil waste that does not meet the particle size requirements.

[0007] The secondary dispersion structure is fixed below the primary vibrating screen structure and is used to store lunar soil particles that meet the particle size requirements. It can also disperse the clustered lunar soil particles in the secondary dispersion structure by vibration and send them into the electrostatic conveying structure.

[0008] The inlet end of the electrostatic transport structure is located below the secondary dispersion structure, and the outlet end is located at the transport target. Multiple sets of annular electrodes are provided on the outer surface of the electrostatic transport structure. The annular electrodes are connected to the power module to form a periodic traveling wave electrostatic field inside the electrostatic transport structure. Under the action of the electrostatic field, the lunar soil particles falling into the electrostatic transport structure become charged and move directionally along the electrostatic transport structure to the outlet end. The lunar soil particles at the outlet end use their velocity to overcome the problem of lunar soil particle suspension caused by the low gravity of the lunar surface, thereby reaching the transport target.

[0009] The power module is used to supply power to the primary vibrating screen structure, the secondary dispersion structure, and the electrostatic conveying structure.

[0010] Furthermore, a lunar soil screening-electrostatic transport load device for lunar surface construction also includes a load frame. The primary vibrating screen structure is fixed to the inner side wall of the load frame by a fixing plate, the secondary dispersion structure is fixed below the primary vibrating screen structure by a fixing plate, and the electrostatic transport structure is fixed to the bottom surface of the load frame by a bracket.

[0011] The primary vibrating screen structure includes a primary powder storage tank, a primary tilting mechanism, a primary fixing mechanism, and a vibration motor A; the secondary dispersing structure includes a secondary powder storage tank, a secondary fixing mechanism, and a vibration motor B.

[0012] The first-stage flipping mechanism is mounted on the fixed plate. The first-stage fixed structure is coupled to the first-stage flipping mechanism and can flip relative to the bottom plate under the action of the flipping mechanism. During the flipping process, a limiting device is used to limit the movement. The first-stage powder storage tank is elastically connected to the first-stage fixed mechanism. A screen I is installed at the bottom outlet of the first-stage powder storage tank. Under the action of the vibrating motor A, the lunar soil particles in the first-stage powder storage tank are screened and then output to the second-stage powder storage tank for storage.

[0013] The secondary powder storage tank is elastically connected to the secondary fixing mechanism. A screen II is installed at the bottom outlet of the secondary powder storage tank. Under the action of the vibrating motor B, the clumps of lunar soil particles in the secondary powder storage tank are dispersed and sent into the electrostatic conveying structure.

[0014] Furthermore, the electrostatic transport structure is a frustum-shaped structure with an axial opening on the side wall, and the diameter of the inlet end is larger than that of the outlet end.

[0015] Furthermore, the power module provides four-phase AC power to the electrostatic transport structure. N sets of ring electrodes are arranged on the surface of the electrostatic transport structure, sequentially numbered from the inlet to the outlet: the first set, the second set…the Nth set. Each set of ring electrodes consists of four adjacent electrode rings. n1 X n2 X n3 X n4 Composition, n takes values ​​from 1 to N, X in each group of ring electrodes n1 All are connected to the L1 circuit of the four-phase AC power supply, and X in each group of ring electrodes n2 All are connected to the L2 circuit of the four-phase AC power supply, and X in each group of ring electrodes n3 All are connected to the four-phase AC L3 circuit, and X in each group of ring electrodes n4 All are connected to the L4 circuit of the four-phase AC power supply; the voltage amplitude and voltage frequency of the four-phase AC power supply can be continuously adjusted within a preset range.

[0016] Furthermore, the primary fixing mechanism is a hollow double-layer rectangular structure. A support structure is provided between the two layers of the hollow double-layer rectangular structure. A connecting structure is provided on the two sides adjacent to the support structure and connected to the primary flipping mechanism. The remaining part is an open space. The primary powder storage tank is a cylindrical structure that is open at one end and gradually converges to the other end. A rectangular panel that cooperates with the primary fixing structure is provided on the outside of the primary powder storage tank. The primary powder storage tank is located in the hollow part of the primary fixing mechanism. The rectangular panel of the primary powder storage tank is located between the two layers of the primary fixing mechanism. Multiple springs and spring connectors are used to connect the rectangular panel of the primary powder storage tank to the upper and lower layers of the primary fixing mechanism. The vibration motor A is set on the outer side wall of the primary powder storage tank and forms a vibrating screen action together with the springs.

[0017] Furthermore, the secondary fixing mechanism is a hollow double-layer rectangular symmetrical structure with a supporting structure between the two layers, and the remaining parts are open spaces. The secondary powder storage tank is a cylindrical structure that opens at one end and gradually converges towards the other end. A rectangular panel that cooperates with the secondary fixing structure is set on the outside of the secondary powder storage tank. The secondary powder storage tank is located inside the hollow part of the secondary fixing mechanism, and the rectangular panel of the secondary powder storage tank is located between the two layers of the secondary fixing mechanism. Multiple springs and spring connectors are used to connect the rectangular panel of the secondary powder storage tank to the upper and lower layers of the secondary fixing mechanism. The vibration motor B is set on the outer side wall of the secondary powder storage tank, and together with the springs, it forms a dispersing effect. The cross-sectional area of ​​the open end of the secondary powder storage tank is larger than that of the converging end of the primary powder storage tank, and the cross-sectional area of ​​the converging end of the secondary powder storage tank is smaller than the upper opening of the inlet end of the electrostatic conveying structure, and the converging end extends into the interior of the electrostatic conveying structure.

[0018] Furthermore, the mesh size of sieve I is selected according to the required particle size of lunar soil particles to be screened, and the mesh size of sieve II is 90%-100% of that of sieve I.

[0019] Furthermore, the primary tilting mechanism includes a rotary motor, a reducer, a motor base, a coupling, bearing A, bearing housing A, transmission shaft A, transmission shaft B, bearing housing B, and bearing B; the connecting structures arranged opposite each other on two adjacent sides of the support structure of the primary fixing mechanism are connecting structure A and connecting structure B; one end of the transmission shaft A is fixed to the outer end face of the connecting structure A, and the other end is connected to the coupling, reducer, and rotary motor in sequence through bearing A; bearing A is fixed to the fixing plate using bearing housing A; the rotary motor and reducer are fixed to the fixing plate through the motor base; one end of the transmission shaft B is fixed to the outer end face of the connecting structure B, and the other end passes through bearing B; bearing B is fixed to the fixing plate using bearing housing B.

[0020] Furthermore, the limiting device includes limiting block A, limiting block B, limiting block C, and limiting block D. Limiting block A is fixed to the outer end face of the connecting structure B. Limiting block B consists of two parts, which are respectively fixed to the two sides of the bearing seat B. Limiting block D is installed on the non-fixed end of the transmission shaft B. Limiting block C consists of two parts, both of which are L-shaped structures and are fixed to the outer end face of the bearing seat B. Limiting block D cooperates with limiting block C, and limiting block A cooperates with limiting block B, to restrict the rotary motor from driving the primary powder storage tank to rotate within a 180° plane.

[0021] The present invention also provides a method for screening and transporting lunar soil using the lunar soil screening-electrostatic transport load device constructed facing the lunar surface.

[0022] S1, place the lunar soil particles in the primary storage tank, connect the power supply of the vibrating motor A, and the lunar soil particles in the primary storage tank are screened by the vibrating motor A and the primary fixing mechanism. The lunar soil particles of suitable size fall into the secondary storage tank through the bottom screen I of the primary storage tank.

[0023] S2, after the vibrating screen has been in operation for a certain period of time, turn off the power supply of the vibrating motor A and turn on the power supply of the first-stage tilting mechanism. The remaining soil particles in the first-stage powder storage tank that do not meet the particle size requirements are treated as waste. Under the action of the first-stage tilting mechanism and the limiting device, the first-stage powder storage tank is tilted 180° to dump the waste.

[0024] S3, after the waste is dumped, the first-level powder storage tank is reversed and flipped under the action of the first-level flipping mechanism and the limiting device. After returning to the initial working position, the power supply of the first-level flipping mechanism is cut off. S1 and S2 are repeated multiple times so that the second-level powder storage tank accumulates lunar soil particles that meet the preset amount.

[0025] S4, turn off the power of vibration motor A and primary flipping mechanism, turn on the power of electrostatic conveying structure, and then turn on the power of vibration motor B. Under the action of vibration motor B and secondary fixing mechanism, the lunar soil particles in the secondary powder storage tank are dispersed by the bottom screen II of the secondary powder storage tank and fall into the electrostatic conveying structure.

[0026] S5, the lunar soil particles falling into the electrostatic conveying structure undergo directional motion under the action of the traveling wave electrostatic field and are conveyed to the outlet end of the electrostatic conveying structure. The lunar soil particles use the initial velocity when leaving the outlet end to reach the conveying target.

[0027] The advantages of this invention compared to the prior art are:

[0028] (1) This invention can overcome the difficulties in pre-processing and conveying of powder materials caused by the special properties of lunar soil and the special environment of the lunar surface, and realize the integrated operation of in-situ screening, conveying and waste dumping of lunar soil powder raw materials; the primary vibrating screen structure obtains lunar soil particle raw materials that meet the particle size requirements through vibrating screen, and stores the screened particles in the secondary dispersion structure, and dumps the waste out of the device; a certain amount of particles are stored in the secondary dispersion structure to ensure the printing continuity within a certain time, and the bottom screen can ensure that the clumps of lunar soil powder are dispersed and enter the electrostatic conveying structure; the electrostatic conveying structure uses the electrostatic field to control the lunar soil particles to achieve directional movement, and the lunar soil at the outlet of the electrostatic conveying structure has a certain initial velocity, which can overcome the problem of lunar soil suspension under low gravity on the lunar surface, accurately reach the sensor position / or the printing target position, and realize the powder supply.

[0029] (2) The bottom outlet section of the secondary dispersion structure can be reduced as much as possible. On the one hand, it can be matched with the bottom screen of the secondary dispersion structure to prevent the lunar soil particles falling from the primary vibrating screen structure from falling directly into the electrostatic conveying structure without dispersion treatment. On the other hand, it can control the amount of lunar soil falling from the bottom of the secondary dispersion structure to avoid the powder falling from the secondary dispersion structure too fast, so that the dispersion falling speed of the powder matches the powder conveying capacity of the electrostatic conveying structure.

[0030] (3) The electrostatic conveying structure is designed as a frustum-shaped structure with a larger diameter at the inlet end than at the outlet end. It is wrapped with an annular electrode and the base is an insulating material. The frustum-shaped structure design enhances the electric field strength near the outlet end inside the pipe, and the force on the particles gradually increases along the direction of particle movement, thereby forming a particle spraying and powder feeding state at the outlet end to increase the initial velocity of the outlet particles and ensure that the particles overcome the suspension effect and reach the transport target.

[0031] (4) In principle, the present invention can be fully automated through the control program without human intervention. It can also be used in conjunction with lunar robots. The lunar robots can be used to put the pre-screened lunar soil powder into the first-stage vibrating screen structure, and then the powder can be supplied by this device, which can improve the efficiency of lunar construction and is in line with lunar application scenarios. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention;

[0033] Figure 2 This is a schematic diagram of the primary vibrating screen structure, the secondary dispersion structure, and the electrostatic conveying structure of the present invention;

[0034] Figure 3 This is a schematic diagram of the primary powder storage tank of the present invention;

[0035] Figure 4 This is a schematic diagram of the first-stage flipping mechanism and the first-stage fixing mechanism of the present invention;

[0036] Figure 5 This is a schematic diagram of the structure of the secondary powder storage tank of the present invention;

[0037] Figure 6 This is a schematic diagram of the limiting device of the present invention;

[0038] Figure 7 This is a schematic diagram of the waste dumping process during the operation of the device of the present invention.

[0039] In the diagram: 1-Load frame; 2-Control module; 3-Power supply module; 4-Electrostatic conveying structure; 5-Mass flow sensor; 6-Primary powder storage tank; 7-Secondary powder storage tank; 8-Bracket; 9-Interface module; 10-Wire; 11-Vibration motor A; 12-Vibration motor B; 13-Primary fixing mechanism; 14-Spring connector A; 15-Spring A; 16-Bearing seat A; 17-Fixing plate; 18-Rotating motor; 19-Reducer; 20-Motor seat; 21-Coupling; 22-Bearing A; 23-Drive shaft A; 24-Drive shaft B; 25-Limit block A; 26-Limit block B; 27-Limit block C; 28-Secondary fixing mechanism; 29-Limit block D; 30-Bearing seat B; 31-Bearing B; 32-Spring connector B; 33-Spring B. Detailed Implementation

[0040] To better understand the technical solution of the present invention, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] like Figure 1As shown, the system mainly includes a load frame 1, a control module 2, a power supply module 3, an electrostatic conveying structure 4, a mass flow sensor 5, a primary vibrating screen structure, a secondary dispersion structure, a support 8, and an interface module 9. The primary vibrating screen structure includes a primary powder storage tank 6, a primary tilting mechanism, a primary fixing mechanism 13, and a vibrating motor A11. The secondary dispersion structure includes a secondary powder storage tank 7, a secondary fixing mechanism 28, and a vibrating motor B12. The control module 2 primarily controls the start / stop, vibrating, and tilting operations of the primary vibrating screen structure, the start / stop and dispersion operations of the secondary dispersion structure, and the start / stop and conveying operations of the electrostatic conveying structure 4. The power supply module 3 provides power to devices requiring electricity. The interface module 9 provides a connection interface for communication and power supply between the load and external devices (such as internal cabinets or landers).

[0042] The primary vibrating screen structure is fixed to the inner side wall of the load frame by the fixing plate 17. The secondary dispersion structure is fixed to the lower part of the primary vibrating screen structure by the fixing plate 17. The electrostatic conveying structure 4 is fixed to the bottom of the load frame by the bracket 8, so that its inlet end is located below the secondary dispersion structure and its outlet end is located at the conveying target / mass flow sensor 5.

[0043] During the technical verification of this load device, the mass flow sensor 5 is arranged at the outlet end of the electrostatic conveying structure 4 to record the lunar soil conveying rate and verify the implementation effect of the lunar soil screening-electrostatic conveying load device in the lunar environment. When the lunar soil screening-electrostatic conveying load device of this invention is used for powder screening pretreatment and powder supply for lunar 3D printing, the outlet end of the electrostatic conveying structure 4 corresponds to the printing target position, and the lunar soil particle raw material that meets the particle size requirements is conveyed to the printing target position to realize the printing material supply.

[0044] Furthermore, the specific structure of this preferred embodiment is described below:

[0045] like Figure 2 , Figure 4 As shown, the primary fixing mechanism 13 is a hollow double-layer rectangular structure. A hollow rectangular plate is set between the two layers on one side of the primary fixing mechanism 13 as a support structure. Two connecting panels are set opposite each other on the two sides adjacent to the support structure, referred to as connecting structure A (left side in the figure) and connecting structure B (right side in the figure), which are connected to the primary flipping mechanism. The rest of the parts are open spaces.

[0046] like Figure 3 As shown, the primary powder storage tank 6 is a cylindrical structure that is open at one end and gradually converges towards the other end. A rectangular panel that cooperates with the primary fixed structure 13 is provided on the outside of the primary powder storage tank 6. A screen I is provided at the bottom outlet of the primary powder storage tank, and the screen mesh number is selected according to the required particle size.

[0047] The primary powder storage tank 6 is located inside the hollow part of the primary fixing mechanism 13. The rectangular panel of the primary powder storage tank 6 is located between the two layers of the primary fixing mechanism. Multiple springs A15 and spring connectors A14 are used to connect the rectangular panel of the primary powder storage tank 6 to the upper and lower layers of the primary fixing mechanism 13. The vibration motor A11 is set on the outer side wall of the primary powder storage tank 6 and together with the springs A15, it forms a vibrating screen to screen the lunar soil particles in the primary powder storage tank 6 and output them to the secondary powder storage tank 7 for storage.

[0048] like Figure 1 , Figure 2 As shown, the secondary fixing mechanism 28 is also a hollow double-layer rectangular symmetrical structure. A supporting structure is provided on one side of the secondary fixing mechanism 28, and the rest is an open space.

[0049] like Figure 2 , Figure 5 As shown, the secondary powder storage tank 7 is a cylindrical structure that is open at one end and gradually converges towards the other end. A rectangular panel that cooperates with the secondary fixed structure 28 is provided on the outside of the secondary powder storage tank 7. A screen II is provided at the bottom outlet of the secondary powder storage tank 7. The mesh size of the screen II is the same as or slightly smaller than that of the screen I, so that the particles obtained by screening can be stored in the secondary powder storage tank and smoothly pass through the converging end of the secondary powder storage tank 7 under the action of vibration and fall into the lower electrostatic powder conveying structure 4. The cross-sectional area of ​​the open end of the secondary powder storage tank 7 is larger than that of the converging end of the primary powder storage tank 6. The cross-sectional area of ​​the converging end of the secondary powder storage tank 7 is smaller than that of the inlet end of the electrostatic conveying structure 4, and the converging end extends into the interior of the electrostatic conveying structure 4, close to the bottom inner surface of the electrostatic conveying structure 4.

[0050] The secondary powder storage tank 7 is located inside the hollow part of the secondary fixing mechanism 28. The rectangular panel of the secondary powder storage tank 7 is located between the two layers of the secondary fixing mechanism 28. Multiple springs B33 and spring connectors B32 are used to connect the rectangular panel of the secondary powder storage tank 7 to the upper and lower layers of the secondary fixing mechanism 28. The vibration motor B12 is set on the outer side wall of the secondary powder storage tank 7. Together with the springs, it forms a dispersing effect, destroys the agglomeration behavior of lunar soil particles, and disperses the agglomerated lunar soil particles in the secondary powder storage tank into the electrostatic conveying structure 4.

[0051] like Figure 1 , Figure 2As shown, multiple sets of annular electrodes are provided on the outer surface of the electrostatic transport structure 4. The annular electrodes are connected to the power module 3 via cables. After being energized, a periodically propagating traveling wave electrostatic field is formed inside the electrostatic transport structure 4. This allows lunar soil particles falling into the electrostatic transport structure 4 to acquire a certain amount of charge under the action of the electrostatic field and move directionally along the electrostatic transport structure 4 to the outlet end of the electrostatic transport structure. The lunar soil particles at the outlet end of the electrostatic transport structure 4 still have a certain initial velocity, thereby overcoming the problem of lunar soil particle suspension caused by the low gravity of the lunar surface and enabling the lunar soil to reach the transport target.

[0052] Preferably, the electrostatic transport structure 4 is a cylindrical structure with a fully or partially through axial opening on its side wall, and the diameter of the inlet end is larger than that of the outlet end.

[0053] Preferably, the power module 3 provides four-phase AC power to the electrostatic transport structure 4. The N sets of ring electrodes on the surface of the electrostatic transport structure 4 are arranged sequentially from the inlet end to the outlet end as the first group, the second group, ... the Nth group. Each set of ring electrodes consists of four adjacent electrode rings Xn1, Xn2, Xn3, and Xn4, where n is 1 to N. Xn1 in each set of ring electrodes is connected to the L1 path of the four-phase AC power, Xn2 in each set of ring electrodes is connected to the L2 path of the four-phase AC power, Xn3 in each set of ring electrodes is connected to the L3 path of the four-phase AC power, and Xn4 in each set of ring electrodes is connected to the L4 path of the four-phase AC power.

[0054] Preferably, the amplitude of the four-phase AC voltage can be continuously adjusted within the range of 500~3000V, and the voltage frequency can be continuously adjusted within the range of 2Hz~300Hz to adapt to the transport requirements of lunar soil particles of different sizes. Similarly, the power supply excitation can be three-phase, six-phase, or other different methods, depending on the specific experimental results and the desired implementation effect.

[0055] like Figure 2 , Figure 4 , Figure 6 As shown, the first-stage flipping mechanism is set on the fixed plate 17, and the first-stage fixed structure 13 is coupled to the first-stage flipping mechanism. It can flip relative to the base plate under the action of the flipping mechanism, and the limiting device is used to limit the flipping process.

[0056] Preferably, the primary tilting mechanism includes a rotary motor 18, a reducer 19, a motor base 20, a coupling 21, a bearing A22, a bearing housing A16, a drive shaft A23, a drive shaft B24, a bearing housing B30, and a bearing B31. One end of the drive shaft A23 is fixed to the outer end face of the connecting structure A of the primary fixing structure 13, and the other end is connected to the coupling 21, the reducer 19, and the rotary motor 18 in sequence through the bearing A22. The bearing A22 is fixed to the fixing plate using the bearing housing A16. The rotary motor 18 and the reducer 19 are fixed to the fixing plate 17 through the motor base 20. One end of the drive shaft B24 is fixed to the outer end face of the connecting structure B of the primary fixing structure 13, and the other end passes through the bearing B31. The bearing B31 is fixed to the fixing plate 17 using the bearing housing B30.

[0057] Preferably, the limiting device includes limiting block A25, limiting block B26, limiting block C27, and limiting block D29. Limiting block A25 is fixed to the outer end face of the connecting structure B. Limiting block B26 consists of two parts, which are respectively fixed to the two sides of the bearing seat B30. Limiting block D29 is installed at the end of the drive shaft B24, i.e., the non-fixed end. Limiting block C27 consists of two parts, both of which are L-shaped structures and are fixed to the outer end face of the bearing seat B30. Limiting block D cooperates with limiting block C, and limiting block A cooperates with limiting block B, to limit the rotation of the primary powder storage tank driven by the rotary motor within a 180° plane.

[0058] According to the aforementioned connection relationship, when the rotary motor 18 is turned on, it drives the primary fixed structure 13 and the primary powder storage tank 6 to rotate through the coupling 21 and the transmission shaft A23, thereby driving the transmission shaft B24 to rotate. The rotation angle is limited by the positional relationship between the limit block A25 and the limit block B26, and the limit block D29 and the limit block C27, limiting the rotation angle to 180°, so as to dump the lunar soil waste in the primary powder storage tank 6 that does not meet the particle size requirements.

[0059] Preferably, the power supply module 3 is connected to the electrical equipment such as the rotary motor 18, reducer 19, vibrating motor A11, vibrating motor B12, mass flow sensor 5, and electrostatic conveying structure 4 via electrical connectors and cables to provide power supply; the control module 2 provides control, communication, data transmission and recording to the controlled devices such as the primary vibrating screen structure, secondary dispersion structure, electrostatic conveying structure 4, and mass flow sensor 5 via electrical connectors, cables and data lines to realize the power supply and automated control of the load device.

[0060] In this embodiment, as Figure 7 As shown, the method for screening and transporting lunar soil based on the aforementioned lunar soil screening-electrostatic transport load device constructed facing the lunar surface is implemented as follows:

[0061] Step 1: Before the device is started, the lunar robot puts the pre-screened lunar soil particles into the primary powder storage tank 6. First, the power of the vibration motor A11 is turned on. At this time, the lunar soil particles in the primary powder storage tank 6 are screened by the vibration motor A11, the spring A15 and the bottom screen I of the primary powder storage tank 6. The lunar soil particles of suitable size fall into the secondary powder storage tank 7 through the bottom screen I of the primary powder storage tank 6.

[0062] Step 2: After the primary powder storage tank 6 has been vibrating for a certain period of time, it is determined that the remaining lunar soil particles in the primary powder storage tank 6 cannot pass through screen I, that is, the particle size does not meet the requirements, and the remaining lunar soil particles are waste. At this time, the power supply of the vibrating motor A11 is turned off, and the power supply of the rotary motor 18 and the reducer 19 is turned on. The rotary motor 18 works and drives the primary fixed structure 13 and the primary powder storage tank 6 to rotate outward through the transmission shaft A23 and the transmission shaft B24. At the same time, the limiting blocks A25, B26, C27 and D29 cooperate with each other to make the primary powder storage tank 6 rotate 180°, thereby dumping the waste.

[0063] Step 3: After the waste is dumped, the rotary motor 18 drives the primary powder storage tank 6 to reverse and rotate. After returning to the initial working position, the power supply of the rotary motor 18 and the reducer 19 is cut off. Steps 1 and 2 are repeated multiple times to accumulate a certain amount of lunar soil particles of suitable size in the secondary powder storage tank 7.

[0064] Step 4: After sufficient lunar soil particles have accumulated in the secondary storage tank 7, turn off the power to the vibration motor A11, the rotary motor 18, and the reducer 19, and turn on the power to the electrostatic conveying structure 4 and the mass flow sensor 5. Then turn on the power to the vibration motor B12. At this time, the lunar soil particles that meet the particle size requirements stored in the secondary storage tank 7 are dispersed and fall into the electrostatic conveying structure 4 under the action of the vibration motor B12, the spring B33, and the screen II at the bottom of the secondary storage tank 7. The screen II at the bottom of the secondary storage tank 7 plays the role of dispersing the agglomerated lunar soil particles.

[0065] Step 5: The annular electrodes of the electrostatic conveying structure 4 are sequentially connected to the four-phase AC voltage of the power supply module 3, forming a traveling wave electrostatic field inside. Lunar soil particles falling into the electrostatic conveying structure 4 are directionally transported under the action of the traveling wave electrostatic field and transported to the outlet end of the electrostatic conveying structure 4. When the device is used for technical verification, the lunar soil particles fall onto the mass flow sensor 5, which records the mass transfer rate of the lunar soil particles and completes the load test. When the device is used as a lunar soil powder supply device in the in-situ 3D printing process, the outlet of the electrostatic conveying structure 4 corresponds to the printing target position. After being transported by the electrostatic conveying structure 4, the lunar soil particles fall from the outlet of the electrostatic conveying structure 4 to the 3D printing target position, providing raw materials for the printing process.

[0066] It is understood that this invention has been described through embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to adapt to specific circumstances without departing from the spirit and scope of this invention. Therefore, this invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are protected by this invention.

[0067] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A lunar soil screening-electrostatic transport load device constructed facing the lunar surface, characterized in that: It includes a primary vibrating screen structure, a secondary dispersion structure, an electrostatic conveying structure, and a power supply module; The primary vibrating screen structure uses a vibrating screen method to obtain lunar soil particles that meet the particle size requirements, stores them in the secondary dispersion structure, and dumps lunar soil waste that does not meet the particle size requirements. The secondary dispersion structure is fixed below the primary vibrating screen structure and is used to store lunar soil particles that meet the particle size requirements. It can also disperse the clustered lunar soil particles in the secondary dispersion structure by vibration and send them into the electrostatic conveying structure. The inlet end of the electrostatic transport structure is located below the secondary dispersion structure, and the outlet end is located at the transport target. Multiple sets of annular electrodes are provided on the outer surface of the electrostatic transport structure. The annular electrodes are connected to the power module to form a periodic traveling wave electrostatic field inside the electrostatic transport structure. Under the action of the electrostatic field, the lunar soil particles falling into the electrostatic transport structure become charged and move directionally along the electrostatic transport structure to the outlet end. The lunar soil particles at the outlet end use their velocity to overcome the problem of lunar soil particle suspension caused by the low gravity of the lunar surface, thereby reaching the transport target. The power module is used to supply power to the primary vibrating screen structure, the secondary dispersion structure, and the electrostatic conveying structure.

2. The lunar soil screening-electrostatic transport load device for lunar surface construction according to claim 1, characterized in that: It also includes a load frame, wherein the primary vibrating screen structure is fixed to the inner side wall of the load frame by a fixing plate, the secondary dispersion structure is fixed to the lower part of the primary vibrating screen structure by a fixing plate, and the electrostatic conveying structure is fixed to the bottom surface of the load frame by a bracket; The primary vibrating screen structure includes a primary powder storage tank, a primary tilting mechanism, a primary fixing mechanism, and a vibrating motor A; the secondary dispersing structure includes a secondary powder storage tank, a secondary fixing mechanism, and a vibrating motor B. The first-stage flipping mechanism is mounted on the fixed plate. The first-stage fixed structure is coupled to the first-stage flipping mechanism and can flip relative to the bottom plate under the action of the flipping mechanism. During the flipping process, a limiting device is used to limit the movement. The first-stage powder storage tank is elastically connected to the first-stage fixed mechanism. A screen I is installed at the bottom outlet of the first-stage powder storage tank. Under the action of the vibrating motor A, the lunar soil particles in the first-stage powder storage tank are screened and then output to the second-stage powder storage tank for storage. The secondary powder storage tank is elastically connected to the secondary fixing mechanism. A screen II is installed at the bottom outlet of the secondary powder storage tank. Under the action of the vibrating motor B, the clumps of lunar soil particles in the secondary powder storage tank are dispersed and sent into the electrostatic conveying structure.

3. The lunar soil screening-electrostatic transport load device constructed facing the lunar surface according to claim 1 or 2, characterized in that: The electrostatic transport structure is a frustum-shaped structure with an axial opening on the side wall, and the diameter of the inlet end is larger than that of the outlet end.

4. The lunar soil screening-electrostatic transport load device for lunar surface construction according to claim 3, characterized in that: The power module provides four-phase AC power to the electrostatic transport structure. N sets of ring electrodes are arranged on the surface of the electrostatic transport structure, numbered sequentially from the inlet to the outlet: first group, second group… Nth group. Each set of ring electrodes consists of four adjacent electrode rings. n1 X n2 X n3 X n4 Composition, n takes values ​​from 1 to N, X in each group of ring electrodes n1 All are connected to the L1 circuit of the four-phase AC power supply, and X in each group of ring electrodes n2 All are connected to the L2 circuit of the four-phase AC power supply, and X in each group of ring electrodes n3 All are connected to the four-phase AC L3 circuit, and X in each group of ring electrodes n4 All are connected to the L4 circuit of the four-phase AC power supply; the voltage amplitude and voltage frequency of the four-phase AC power supply can be continuously adjusted within a preset range.

5. The lunar soil screening-electrostatic transport load device for lunar surface construction according to claim 2, characterized in that: The primary fixing mechanism is a hollow double-layer rectangular structure. A support structure is set between the two layers of the hollow double-layer rectangular structure. A connecting structure is set on the two sides adjacent to the support structure and connected to the primary flipping mechanism. The rest of the part is an open space. The primary powder storage tank is a cylindrical structure that is open at one end and gradually converges to the other end. A rectangular panel that cooperates with the primary fixing structure is set on the outside of the primary powder storage tank. The primary powder storage tank is located in the hollow part of the primary fixing mechanism. The rectangular panel of the primary powder storage tank is located between the two layers of the primary fixing mechanism. Multiple springs and spring connectors are used to connect the rectangular panel of the primary powder storage tank to the upper and lower layers of the primary fixing mechanism. The vibration motor A is set on the outer side wall of the primary powder storage tank and forms a vibrating screen action together with the springs.

6. The lunar soil screening-electrostatic transport load device for lunar surface construction according to claim 5, characterized in that: The secondary fixing mechanism is a hollow double-layer rectangular symmetrical structure with a supporting structure between the two layers, and the rest is an open space. The secondary powder storage tank is a cylindrical structure that opens at one end and gradually converges towards the other end. A rectangular panel that cooperates with the secondary fixing structure is set on the outside of the secondary powder storage tank. The secondary powder storage tank is located inside the hollow part of the secondary fixing mechanism, and the rectangular panel of the secondary powder storage tank is located between the two layers of the secondary fixing mechanism. Multiple springs and spring connectors are used to connect the rectangular panel of the secondary powder storage tank to the upper and lower layers of the secondary fixing mechanism. The vibration motor B is set on the outer side wall of the secondary powder storage tank and forms a dispersing effect together with the springs. The cross-sectional area of ​​the open end of the secondary powder storage tank is larger than that of the converging end of the primary powder storage tank. The cross-sectional area of ​​the converging end of the secondary powder storage tank is smaller than the upper opening of the inlet end of the electrostatic conveying structure, and the converging end extends into the interior of the electrostatic conveying structure.

7. A lunar soil screening-electrostatic transport load device constructed facing the lunar surface according to claim 2 or 6, characterized in that: The mesh size of sieve I is selected according to the required particle size of lunar soil particles to be screened, and the mesh size of sieve II is 90%-100% of that of sieve I.

8. The lunar soil screening-electrostatic transport load device for lunar surface construction according to claim 5, characterized in that: The primary tilting mechanism includes a rotary motor, a reducer, a motor base, a coupling, bearing A, bearing housing A, transmission shaft A, transmission shaft B, bearing housing B, and bearing B. Connecting structures A and B are arranged opposite each other on two adjacent sides of the hollow double-layer rectangular support structure. One end of transmission shaft A is fixed to the outer end face of connecting structure A, and the other end is sequentially connected to the coupling, reducer, and rotary motor via bearing A. Bearing A is fixed to a fixed plate using bearing housing A. The rotary motor and reducer are fixed to the fixed plate via motor bases. One end of transmission shaft B is fixed to the outer end face of connecting structure B, and the other end passes through bearing B. Bearing B is fixed to the fixed plate using bearing housing B.

9. The lunar soil screening-electrostatic transport load device for lunar surface construction according to claim 8, characterized in that: The limiting device includes limiting block A, limiting block B, limiting block C, and limiting block D. Limiting block A is fixed to the outer end face of the connecting structure B. Limiting block B consists of two parts, which are respectively fixed to the two sides of the bearing seat B. Limiting block D is installed on the non-fixed end of the transmission shaft B. Limiting block C consists of two parts, both of which are L-shaped structures and are fixed to the outer end face of the bearing seat B. Limiting block D cooperates with limiting block C, and limiting block A cooperates with limiting block B, to limit the rotation of the primary powder storage tank driven by the rotary motor to rotate within a 180° plane.

10. A method for screening and conveying lunar soil using the lunar soil screening-electrostatic transport load device constructed facing the lunar surface as described in claim 2, characterized in that: S1, place the lunar soil particles in the primary storage tank, connect the power supply of the vibrating motor A, and the lunar soil particles in the primary storage tank are screened by the vibrating motor A and the primary fixing mechanism. The lunar soil particles of suitable size fall into the secondary storage tank through the bottom screen I of the primary storage tank. S2, after the vibrating screen has been in operation for a certain period of time, turn off the power supply of the vibrating motor A and turn on the power supply of the first-stage tilting mechanism. The remaining soil particles in the first-stage powder storage tank that do not meet the particle size requirements are treated as waste. Under the action of the first-stage tilting mechanism and the limiting device, the first-stage powder storage tank is tilted 180° to dump the waste. S3, after the waste is dumped, the first-level powder storage tank is reversed and flipped under the action of the first-level flipping mechanism and the limiting device. After returning to the initial working position, the power supply of the first-level flipping mechanism is cut off. S1 and S2 are repeated multiple times so that the second-level powder storage tank accumulates lunar soil particles that meet the preset amount. S4, turn off the power of vibration motor A and primary flipping mechanism, turn on the power of electrostatic conveying structure, and then turn on the power of vibration motor B. Under the action of vibration motor B and secondary fixing mechanism, the lunar soil particles in the secondary powder storage tank are dispersed by the bottom screen II of the secondary powder storage tank and fall into the electrostatic conveying structure. S5, the lunar soil particles falling into the electrostatic conveying structure undergo directional motion under the action of the traveling wave electrostatic field and are conveyed to the outlet end of the electrostatic conveying structure. The lunar soil particles use the initial velocity when leaving the outlet end to reach the conveying target.

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