CN116698472A - Sample escape-preventing device for small celestial body sampling and sampling method - Google Patents

Sample escape-preventing device for small celestial body sampling and sampling method Download PDF

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Publication number
CN116698472A
CN116698472A CN202310311594.7A CN202310311594A CN116698472A CN 116698472 A CN116698472 A CN 116698472A CN 202310311594 A CN202310311594 A CN 202310311594A CN 116698472 A CN116698472 A CN 116698472A
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assembly
sampling
sample
memory alloy
elastic memory
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孔旭
王波
刘雅芳
王晓光
高翔宇
林云成
满剑锋
张熇
曾福明
李海飞
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Beijing Institute of Spacecraft System Engineering
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Beijing Institute of Spacecraft System Engineering
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Priority to CN202310311594.7A priority Critical patent/CN116698472A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
    • B64G4/00—Tools specially adapted for use in space
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/10—Devices for withdrawing samples in the liquid or fluent state
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/10—Devices for withdrawing samples in the liquid or fluent state
    • G01N2001/1006—Dispersed solids

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  • Aviation & Aerospace Engineering (AREA)
  • Centrifugal Separators (AREA)

Abstract

The invention discloses a sample anti-escape device for sampling a small celestial body and a sampling method, wherein the anti-escape device comprises a fixed cylinder, a double-fork arm assembly, a movable cylinder assembly, a cylindrical linear motor assembly, a high-elastic memory alloy wire brushing door assembly, an in-place switch assembly, a compression assembly and a separation spring; one end of the movable cylinder assembly is sleeved on the outer circumference of the fixed cylinder through a separation spring; one end of the double fork arm assembly is fixedly connected with the fixed cylinder, and the other end of the double fork arm assembly supports and fixes the compression assembly; the compression assembly is arranged on the outer circumference of the movable barrel assembly, the separation spring is limited to be in a compressed state, and after the compression assembly is unlocked by a initiating explosive device, the separation spring is released, and the elastic force of the separation spring drives the movable barrel assembly to retract towards the inlet end of the fixed barrel; the in-place switch assembly is triggered after the movable cylinder assembly moves in place, and an in-place signal of the movable cylinder assembly is acquired; the other end of the movable cylinder component is fixedly connected with a cylindrical linear motor component, and the cylindrical linear motor component is electrified to stretch and retract to control the opening and closing of the high-elastic memory alloy wire brushing door component. The invention can realize the escape prevention function in the sample collection process.

Description

Sample escape-preventing device for small celestial body sampling and sampling method
Technical Field
The invention relates to the technical field of space detection sampling return, in particular to a sample escape-preventing device for sampling a celestial body and a sampling method.
Background
With implementation of the deep space sampling detection task at home and abroad, the sample is successfully acquired and simultaneously extremely high on-orbit risks are also involved. The latest sampling task crisis occurs in the year 10 and 22 in 2020, and after the Euclidean detector performs the sampling action, the fully loaded star soil returns to the parking point, and at this time, the on-board sample monitoring camera displays that the collected sample is slowly overflowing from the sampler. Analysis shows that as the polyester film of the sampler seals the acquired star soil and wedges an opening, the acquired Bei Nuxiao-day star soil sample leaks into space through the gap, and emergency situations cause ground staff to make an urgent decision to discard the task of originally-determined on-orbit measurement of the sample sampling amount, cancel the planned multi-sampling task and directly jump to the whole transfer packaging of the sampler. The reliability of the sample escape prevention scheme is important to consider in the following space sampling task when the on-orbit emergency of the Euclidean task wakes up.
Aiming at the requirement of space sampling task sample escape prevention, the Euclidean task adopts a scheme of 'pneumatic polyester film baffle', unidirectional opening of the polyester film baffle is realized by utilizing the pressure of air flow, the baffle is reset after the air stops acting, the sample is not easy to overflow after entering a compartment, the requirement of on-orbit multitime task can be met by matching with an air switch control strategy, but the scheme has the defect that once the sampling amount is excessive, the risk of blocking the baffle by particles exists, so that the sample is lost. The core-less sampling and returning task adopts a scheme of adding a baffle at the tail end of the bottom, the sampling device is provided with 3 independent core tubes, the highest speed of the core tubes can be increased to 90m/s to penetrate into the surface of comet through an ejection mechanism, the lower end of each core tube is in an open design in the sampling process, a baffle blocking mechanism is designed at the bottom of each core tube for preventing samples from being scattered in the sample transferring process, and when the sample collection is completed, the baffle is closed to prevent the samples from falling, but the scheme is not enough to be capable of being used for a single-use nonrepeatable switch. The soil sanitation two surface sampling project then proposes a "flexible finger fish trap" solution, in which the sample holding means is provided with a flexible finger fish trap extending radially from the edge of the sample tube to the central axis, the fingers deforming towards the wall of the sample tube as the sample tube is inserted into the sheath against the bottom sheath shoulder, leaving the central portion of the tube open. The spreading of the fingers allows the tube to sample materials with low penetration resistance, such as fluffy dust. When the sample tube is pulled out of the sheath, the finger is released and returns to the relaxed position, closing the bottom opening of the sample tube. The scheme can keep the lighter sample in the sample tube without falling, and can also perform multiple sampling operations, but has the defect that the heavy sample is not easy to keep in the tube.
In conclusion, the space sampling escape prevention scheme mainly considers stability and safety under space working conditions, and needs to adapt to the requirement of multiple sampling tasks.
Disclosure of Invention
In view of the above, the invention provides a sample anti-escape device and a sampling method for sampling a celestial body, which can realize an anti-escape function in a sample collection process.
The technical scheme adopted by the invention is as follows:
a sample anti-escape device for small celestial body sampling comprises a fixed cylinder, a double-fork arm assembly, a movable cylinder assembly, a cylindrical linear motor assembly, a high-elastic memory alloy wire brushing door assembly, an in-place switch assembly, a compression assembly and a separation spring;
one end of the movable cylinder assembly is sleeved on the outer circumference of the fixed cylinder through a separation spring, and the fixed cylinder is used as a sampling inlet of the device; one end of the double fork arm assembly is fixedly connected with the fixed cylinder, and the other end of the double fork arm assembly supports and fixes the compression assembly; the compressing assembly is arranged on the outer circumference of the movable barrel assembly and used for limiting the separating spring to be in a compressed state in an initial state, and after the compressing assembly is unlocked by a initiating explosive device, the separating spring is released, and the elastic force of the separating spring drives the movable barrel assembly to retract towards the inlet end of the fixed barrel; the in-place switch assembly is arranged on the double fork arm assembly, is triggered after the movable cylinder assembly moves in place and is used for collecting in-place signals of the movable cylinder assembly;
the other end of the movable cylinder assembly is fixedly connected with a cylindrical linear motor assembly, the cylindrical linear motor assembly is connected with the high-elastic memory alloy wire brushing door assembly in a nested mode, and the high-elastic memory alloy wire brushing door assembly is controlled to be opened and closed by power-on stretching.
Further, the cylindrical linear motor assembly comprises a rotor, a stator, a magnetic attraction, a permanent magnet, a pressing ring and an inner guide rail;
the stator is used for generating a rotating magnetic field and generating an axial force for moving the rotor; the rotor is supported by two step surfaces of the inner guide rail to form a sliding friction pair; the magnetic attraction is fixed on the stator, the permanent magnet is fixed on the rotor and limited by the pressing ring, the rotor is in an extending state when the stator is electrified with forward direct current, and the rotor is in a retracting state when the stator is electrified with reverse direct current; when the rotor is in an extending state, the magnetic attraction acts on the permanent magnet to provide power-off holding force for the rotor.
Further, the stator comprises a shell, a coil framework and a winding coil;
the winding coil is glued on the coil framework to form an integral body and then is screwed on the shell; the winding coil generates an axial force for moving the mover by interacting with the mover magnetic field after passing a predetermined current.
Further, the in-place switch component comprises an insulating threading ring, a double-hole gasket, a middle piece, a contact piece, a screw and an upper piece and a lower piece;
the two contact pieces are fixed on the double-fork arm assembly in parallel and at intervals through the upper and lower pieces, and the two contact pieces are insulated through the middle piece; the upper sheet and the lower sheet are fixed through two screws, the two screws are fixed on the end face of the double-fork arm assembly through an insulation penetrating ring, and a double-hole gasket is arranged between the screws and the end face of the double-fork arm assembly; the two contact plates are in contact conduction, and the tail cable of each contact plate receives signals, so that the acquisition function of in-place signals is realized.
Further, the pressing assembly adopts a pressing rod mode, and the pressing rod is arranged along the axis direction of the movable barrel assembly.
Further, the high-elastic memory alloy wire brushing door component comprises high-elastic memory alloy wires, a wire brushing mounting plate and a wire brushing pressing plate;
the brush wire pressing plate is used for pressing the high-elastic memory alloy brush wires on the brush wire mounting plate, the high-elastic memory alloy brush wires point to the axis of the brush wire mounting plate from outside, a plurality of high-elastic memory alloy brush wires are uniformly distributed on the brush wire mounting plate, and the high-elastic memory alloy brush wires are converged on the axis to be in a closed state.
Further, an H-bridge circuit is used for controlling the stator to be electrified with direct current in the forward direction or the reverse direction.
A sample anti-escape sampling method for sampling a celestial body, which adopts the anti-escape device as claimed in claim 2, and comprises the following steps:
the method comprises the steps that firstly, a cylindrical linear motor assembly is powered off in an initial state, a rotor stretches out to keep a high-elastic memory alloy wire brushing door assembly to be completely opened, a separation spring is in a compression state, and a sample collection channel is unobstructed;
step two, electrifying a cylindrical linear motor assembly before the sampling task starts, wherein a rotor stretches out to ensure that the high-elastic memory alloy wire brushing door assembly is completely opened, a separation spring is still in a compressed state, and a collected sample is transferred to a packaging container through a sample collection channel of an escape prevention device;
thirdly, after the single sampling is finished, the cylindrical linear motor assembly is electrified with reverse direct current, the rotor overcomes the resistance of the wire brushing door and the magnetic attraction force for maintaining in a power-off state, and then retracts, the high-elastic memory alloy wire brushing door assembly is closed, the separation spring is still in a compressed state, and at the moment, the sample collecting channel is closed to prevent the sample from escaping;
and step four, sequentially repeating until the sampling task is completed, after the cylindrical linear motor assembly is electrified, the rotor is retracted, the high-elastic memory alloy wire brushing door assembly is closed, the compression assembly is unlocked by a initiating explosive device, the separation spring is released, the movable cylinder assembly is retracted towards the fixed cylinder direction, and at the moment, the sample collection channel is completely and physically separated from the sealed container.
The beneficial effects are that:
1. according to the invention, the sample flow is controlled by adopting two-stage driving, the first-stage driving controls the opening and closing of the high-elasticity memory alloy wire brushing door assembly through the reciprocating action of the cylindrical linear motor assembly, the second-stage driving releases the large-bearing separating spring by utilizing the initiating explosive device to unlock, the connection between the sample collection channel and the packaging container is physically isolated, the problem that the sample escape prevention design is realized through controlling the opening or closing of the sample collection channel under the requirement of a rail repeated sample collection task is solved, and the function independent control is ensured and the sample escape prevention design can be mutually backed up under the double-driving mode.
And secondly, triggering the in-place switch assembly through the separation moving cylinder assembly to feed back the on-orbit escape-proof working state.
2. The cylindrical linear motor assembly has the power-off maintaining function, guarantees the normal open of the sample collection channel, can avoid fault risks and can guarantee the implementation of on-orbit sampling tasks. The power-off maintaining function in the initial state guarantees a normally open mode of the sample collection channel, the motor rotor stretches out in the transmitting stage to ensure that the memory alloy wire brushing door is opened, the impact load of acceleration in the flight process can be adapted, the sample collection channel is ensured to be smooth all the time when the first sampling task is implemented, and the reliability of the on-orbit task is improved.
3. The cylindrical linear motor assembly has the advantages of high output density, simple mechanism and control, small volume, light weight and convenience in sample conveying, and the extension/retraction function of the electrified control motor rotor is matched with the opening/closing of the memory alloy wire brushing door, so that the control on sample circulation is ensured.
4. According to the invention, the compactness of the planar arrangement of the brush wire assembly can be changed by arranging the number and the shape of the brush wires of the high-elasticity memory alloy brush wire door assembly according to the requirement of sampling particles of a target celestial body, so that the selective control of the sample particles is achieved.
5. The invention has the functions of quick response and instantaneous action in place, and the electromagnetic drive and the fire attack are separated from each other, which are included in the principle design of the device, and all have the function of completing the movement in millisecond level.
Drawings
FIG. 1 is a cross-sectional view of the mechanical structure of the device of the present invention;
FIG. 2 is a schematic view of the mechanical structure of the device of the present invention;
FIG. 3 is a right side view of FIG. 2;
FIG. 4 (a) is a schematic diagram of the assembly of a cylindrical linear motor assembly of the apparatus of the present invention;
FIG. 4 (b) is a cross-sectional view of a cylindrical linear motor assembly of the apparatus of the present invention;
FIG. 5 (a) is a schematic diagram of the in-place switch assembly of the apparatus of the present invention;
FIG. 5 (b) is a top view of FIG. 5 (a);
FIG. 6 (a) is a schematic structural view of a high-elastic memory alloy wire brushing door assembly of the device of the invention;
FIG. 6 (b) is a cross-sectional view of a high-elastic memory alloy wire brushing door assembly of the device of the present invention;
fig. 7 (a), fig. 7 (b), and fig. 7 (c) are schematic diagrams of driving principles of the cylindrical linear motor assembly of the device in the initial power-off holding state, the power-on extending working state, and the power-on retracting working state, respectively;
fig. 8 (a) and 8 (b) are schematic structural views of the device in an initial compression state and a release separation state respectively.
The device comprises a 1-moving cylinder assembly, a 2-moving cylinder baffle assembly, a 3-double fork arm assembly, a 4-cable bracket assembly, a 5-compression assembly, a 6-cylindrical linear motor assembly, a 7-in-place switch assembly, an 8-high-elastic memory alloy wire brushing door assembly, a 9-fixed cylinder, a 10-separating spring, an 11-semi-ring pad, a 12-container funnel, a 13-pipe funnel lining, a 14-pipe funnel, a 15-shell, a 16-inner guide rail, a 17-rotor, an 18-coil assembly, a 19-pressing ring, a 20-magnetic magnet yoke, a 21-magnetic magnet steel, a 22-rotor magnet steel, a 23-stator magnet yoke, a 24-insulating penetrating ring, a 25-double-hole gasket, a 26-middle piece, a 27-contact piece, a 28-upper and lower piece, a 29-inner hexagonal socket head screw, a 30-escape function signal wire connector, a 31-high-elastic memory alloy wire brushing wire, a 32-wire brushing mounting plate, a 33-wire brushing pressing plate, a 34-magnet, a 35-permanent magnet, a 36-step surface and a 37-stator.
Detailed Description
The invention will now be described in detail by way of example with reference to the accompanying drawings.
The invention provides a sample escape-preventing device for sampling a small celestial body, which is shown in figures 1-3 and comprises a fixed cylinder, a double-fork arm assembly 3, a movable cylinder assembly 1, a double-fork arm assembly 3, a cylindrical linear motor assembly 6, a high-elastic memory alloy wire brushing door assembly 8, an in-place switch assembly 7, a compressing assembly 5 and a separating spring 10.
One end of the movable cylinder component 1 is sleeved on the outer circumference of the fixed cylinder 9 through a separation spring 10, and meanwhile, the end is fixedly connected with the movable cylinder baffle component 2, and the fixed cylinder 9 is used as a sampling inlet of the device; the inlet end of the fixed cylinder 9 is fixedly connected with a pipeline funnel 14, a pipeline funnel liner 13 is arranged on the inner wall of the pipeline funnel 14, one end of the double-fork arm assembly 3 is fixedly connected with the pipeline funnel 14 and the fixed cylinder 9 through a half ring pad 11 and screws, and the other end of the double-fork arm assembly 3 supports and fixes the compression assembly 5; the compressing component 5 is arranged on the outer circumference of the movable barrel component 1 and used for limiting the separating spring 10 to be in a compressed state in an initial state, and releasing the separating spring 10 after the compressing component is in a fire unlocking state, wherein the elastic force of the separating spring drives the movable barrel component 1 to retract towards the inlet end of the fixed barrel 9; the in-place switch assembly 7 is arranged on the double-fork arm assembly 3, is triggered after the movable cylinder assembly 1 moves in place and is used for collecting in-place signals of the movable cylinder assembly 1; the other end of the movable cylinder component 1 is fixedly connected with a cylindrical linear motor component 6, the cylindrical linear motor component 6 is connected with a high-elastic memory alloy wire brushing door component 8 in a nested manner, and the high-elastic memory alloy wire brushing door component 8 is controlled to be opened and closed by electrifying and stretching. The outlet end of the high-elastic memory alloy wire brushing door assembly 8 is connected with a container funnel 12 for conveying samples to the packaging container.
One end of the cable support assembly 4 is in butt joint with a power supply cable of the cylindrical linear motor assembly 6, and the other end of the cable support assembly is in butt joint with an external power supply.
As shown in fig. 4 (a) and 4 (b), the cylindrical linear motor assembly 6 includes a mover 17, a stator 37, a magnet 34, a permanent magnet 35, a pressing ring 19, and an inner rail 16; the stator 37 is used for generating a rotating magnetic field and generating an axial force for moving the mover 17; the rotor 17 is supported by two step surfaces 36 of the inner guide rail 16 to form a sliding friction pair; the magnetic attraction 34 is fixed on the stator 37, the permanent magnet 35 is fixed on the rotor 17 and is limited axially through the pressing ring 19, the rotor 17 is in an extending state when the stator 37 is electrified with forward direct current, and the rotor 17 is in a retracting state when the stator 37 is electrified with reverse direct current; when the mover 17 is in the extended state, the magnetic attraction 34 acts with the permanent magnet 35 to provide a power-off holding force for the mover 17.
The stator 37 includes a housing 15 and a coil assembly 18, and the coil assembly 18 is integrally formed by bonding a winding coil to a coil bobbin and then is screwed to the housing 15. The winding coil generates an axial force for moving the mover 17 by interacting with the magnetic field of the mover 17 when a predetermined current is applied thereto. The stator yoke 23, the magnetic attraction yoke 20 and the magnetic attraction magnet steel 21 are the magnetic attraction 34, and the stator yoke 23, the magnetic attraction magnet steel 21 and the magnetic attraction yoke 20 are all glued on the coil framework.
The mover magnet steel 22 is a permanent magnet 35, and generates a main magnetic field of linear motion for generating thrust, and is part of a magnetic attraction loop. The stator yoke 23, the magnetic attraction yoke 20, the magnetic attraction magnet 21 and the rotor magnet 22 act to generate magnetic attraction force.
To avoid that the mover 17 of the motor slides off the wire brushing door under the emitting and maneuvering conditions, the magnetic attraction 34 acts with the permanent magnet 35 to generate a magnetic attraction force to provide a power-off holding force thereto, as shown in fig. 7 (a). At the same time, during the process of pulling out the rotor 17 (from the extended state to the retracted state), except for overcoming the friction force of the sliding pair (neglected) and the resistance force f of the wire brushing door s Yet overcome the magnetic attraction force F for power-off holding mag . Thus, the load F of the linear motor m Comprising a defined brush gate resistance and a de-energized holding magnetic attraction force proportional to mover mass (i.e. F m ≥F mag +f s )。
And obtaining the relationship among the position, the current, the thrust and the time of the motor in the operation process by combining an electromagnetic equation and a mechanical equation of the linear motor, wherein the mechanical equation and the electromagnetic equation are shown in the following formula (1).
Wherein t is time, x is position, v is speed, i is current, U is voltage, m is mover mass, L is winding inductance, R is winding resistance, e is counter potential, F mag For magnetic attraction, F m For motor thrust, f s Is friction force.
F m E and F mag The functional relation of (2) is shown in the following formula, and the relation can be obtained through electromagnetic simulation.
And an H-bridge circuit is adopted to control the motor. Meanwhile, in order to avoid damage caused by overlarge current, current closed-loop control is adopted. The voltage across the winding coil is regulated by means of chopping, and the magnitude of the winding coil current is regulated, as shown in fig. 7 (b) and fig. 7 (c).
When the motor rotor 17 stretches out, as shown in fig. 7 (b), a T4 tube (a switch tube shown at the lower right of the drawing) is kept on, a T3 tube (a switch tube shown at the upper right) is kept off, T1 (a switch tube shown at the upper left) and T2 tubes (a switch tube shown at the lower left) are alternately switched, and voltages at two ends of the winding coil are adjusted by adjusting the time ratio of the alternate switching of the T1 tube (the switch tube shown at the upper left) and the T2 tube (the switch tube shown at the lower left). The given current is positive, and after a certain time T, the power is cut off, so that the motor rotor 17 is inserted into the flexible wire brushing door to act.
When the motor rotor 17 is retracted, as shown in fig. 7 (c), a T2 (lower left switch tube) tube is kept on, a T1 tube (upper left switch tube) is kept off, a T3 (upper right switch tube) tube and a T4 tube (lower right switch tube) are alternately switched, and voltages at two ends of the winding coil are adjusted by adjusting the time ratio of the alternate switching of the T3 (upper right switch tube) tube and the T4 tube (lower right switch tube). The given current is negative, and after a certain time T, the power is cut off, so that the motor rotor 17 is pulled out to perform the flexible wire brushing door action.
As shown in fig. 6 (a) and 6 (b), the high-elastic memory alloy brush wire door assembly 8 comprises a high-elastic memory alloy brush wire 31 and a brushA wire mounting plate 32 and a brush wire pressing plate 33; the brush wire pressing plate 33 presses the high-elastic memory alloy brush wires 31 on the brush wire mounting plate 32, the high-elastic memory alloy brush wires 31 point to the axle center of the brush wire mounting plate 32 from outside, and a plurality of high-elastic memory alloy brush wires 31 are uniformly distributed on the brush wire mounting plate 32 and are converged at the axle center to be in a closed state. The scheme of uniformly distributing a plurality of flexible brush wires can avoid the fault mode similar to the Euclidean whole overturning baffle plate, and the maximum gap D of the brush wire door max The maximum particle diameter d of the blocking particles is determined:
d≤D max (3)
as shown in fig. 5 (a) and 5 (b), the in-place switch assembly 7 comprises an insulating penetrating ring 24, a double-hole gasket 25, a middle sheet 26, a contact sheet 27, a hexagon socket head cap screw 29 and an upper sheet and a lower sheet 28; the two contact pieces 27 are fixed on the double-fork arm assembly 3 in parallel and at intervals through the upper and lower pieces 28, and the two contact pieces 27 are insulated through the middle piece 26; the upper and lower sheets 28 are fixed through two inner hexagonal cylindrical head screws 29, the two inner hexagonal cylindrical head screws 29 are fixed on the end face of the double-fork arm assembly 3 through an insulation penetrating ring 24, and a double-hole gasket 25 is arranged between the inner hexagonal cylindrical head screws 29 and the end face of the double-fork arm assembly 3.
The upper and lower plates 28 are made of polyimide, the polyimide has excellent thermal stability and dielectric property, the two contact plates 27 are made of beryllium bronze, and the surfaces of the contact plates are plated with gold, so that the movable barrel assembly 1 is bent by contacting with the switch plates, the short arm of the contact switch is conducted by a circuit, namely, the two contact plates 27 are contacted and conducted, and a cable receiving signal at the tail part of the contact plates 27 is connected with the signal wire joint 30 of the escape-proof function, so that the acquisition function of in-place signals is realized.
The compressing assembly 5 adopts a compressing rod mode, the compressing seat of the double fork arm assembly 3 and the compressing assembly 5 is connected and then fixed on the mounting surface of the whole device, the compressing rod (arranged along the axis direction of the moving cylinder assembly 1) is cut off by a fire cutter to realize unlocking and separating spring 10, the moving cylinder is driven to retract towards the fixed cylinder direction, the separation of the escape preventing device and the packaging container is completed, and a motion schematic diagram is shown in fig. 8 (a) and 8 (b).
The sampling full-period process is divided into four working modes, namely a power-off holding mode under a compression configuration, a power-on extending mode under the compression configuration, a power-on retracting mode under the compression configuration and a power-on retracting mode under a releasing configuration. The specific sampling method comprises the following steps:
the initial state of the cylindrical linear motor assembly 6 is that the linear motor is powered off, the mover 17 stretches out to keep the flexible wire brushing door fully open, the separating spring 10 is in a compressed state, and at the moment, the sample collecting channel is unobstructed;
step two, after the cylindrical linear motor assembly 6 is electrified before each sampling task starts, the rotor 17 stretches out to ensure that the flexible wire brushing door is completely opened, the separating spring 10 is still in a compressed state, and the collected sample is transferred to the packaging container through a sample collecting channel of the escape preventing device;
thirdly, after the single sampling is finished, after the cylindrical linear motor assembly 6 is electrified, the rotor 17 is retracted, the flexible wire brushing door is closed, the separating spring 10 is still in a compressed state, and at the moment, the sample collecting channel is closed to prevent the sample from escaping;
and step four, sequentially repeating until the sampling task is completed, retracting the rotor 17 after the cylindrical linear motor assembly 6 is electrified, closing the flexible wire brushing door, unlocking the compression assembly by a initiating explosive device, and releasing the separation spring 10, wherein the sample collection channel is completely and physically separated from the sealed container.
In summary, the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. The sample escape preventing device for small celestial body sampling is characterized by comprising a fixed cylinder, a double-fork arm assembly, a movable cylinder assembly, a cylindrical linear motor assembly, a high-elastic memory alloy wire brushing door assembly, an in-place switch assembly, a compressing assembly and a separating spring;
one end of the movable cylinder assembly is sleeved on the outer circumference of the fixed cylinder through a separation spring, and the fixed cylinder is used as a sampling inlet of the device; one end of the double fork arm assembly is fixedly connected with the fixed cylinder, and the other end of the double fork arm assembly supports and fixes the compression assembly; the compressing assembly is arranged on the outer circumference of the movable barrel assembly and used for limiting the separating spring to be in a compressed state in an initial state, and after the compressing assembly is unlocked by a initiating explosive device, the separating spring is released, and the elastic force of the separating spring drives the movable barrel assembly to retract towards the inlet end of the fixed barrel; the in-place switch assembly is arranged on the double fork arm assembly, is triggered after the movable cylinder assembly moves in place and is used for collecting in-place signals of the movable cylinder assembly;
the other end of the movable cylinder assembly is fixedly connected with a cylindrical linear motor assembly, the cylindrical linear motor assembly is connected with the high-elastic memory alloy wire brushing door assembly in a nested mode, and the high-elastic memory alloy wire brushing door assembly is controlled to be opened and closed by power-on stretching.
2. The sample escape-preventing device for celestial body sampling of claim 1, wherein said cylindrical linear motor assembly includes a mover, a stator, a magnet, a permanent magnet, a clamping ring, and an inner rail;
the stator is used for generating a rotating magnetic field and generating an axial force for moving the rotor; the rotor is supported by two step surfaces of the inner guide rail to form a sliding friction pair; the magnetic attraction is fixed on the stator, the permanent magnet is fixed on the rotor and limited by the pressing ring, the rotor is in an extending state when the stator is electrified with forward direct current, and the rotor is in a retracting state when the stator is electrified with reverse direct current; when the rotor is in an extending state, the magnetic attraction acts on the permanent magnet to provide power-off holding force for the rotor.
3. The sample escape-preventing device for celestial body sampling of claim 2, wherein said stator includes a housing, a bobbin, and a winding coil;
the winding coil is glued on the coil framework to form an integral body and then is screwed on the shell; the winding coil generates an axial force for moving the mover by interacting with the mover magnetic field after passing a predetermined current.
4. The sample escape-preventing device for celestial body sampling of claim 1, wherein said in-place switch assembly includes an insulating collar, a double hole spacer, a middle plate, a contact plate, a screw, and upper and lower plates;
the two contact pieces are fixed on the double-fork arm assembly in parallel and at intervals through the upper and lower pieces, and the two contact pieces are insulated through the middle piece; the upper sheet and the lower sheet are fixed through two screws, the two screws are fixed on the end face of the double-fork arm assembly through an insulation penetrating ring, and a double-hole gasket is arranged between the screws and the end face of the double-fork arm assembly; the two contact plates are in contact conduction, and the tail cable of each contact plate receives signals, so that the acquisition function of in-place signals is realized.
5. The sample escape preventing device for celestial body sampling of claim 1, wherein the hold-down assembly is a hold-down rod disposed along the axis of the movable barrel assembly.
6. The sample escape prevention apparatus for celestial body sampling of claim 1, wherein said high-elastic memory alloy wire brush door assembly includes a high-elastic memory alloy wire brush, a wire brush mounting plate, and a wire brush platen;
the brush wire pressing plate is used for pressing the high-elastic memory alloy brush wires on the brush wire mounting plate, the high-elastic memory alloy brush wires point to the axis of the brush wire mounting plate from outside, a plurality of high-elastic memory alloy brush wires are uniformly distributed on the brush wire mounting plate, and the high-elastic memory alloy brush wires are converged on the axis to be in a closed state.
7. A sample anti-escape device for celestial sampling as claimed in any one of claims 2 to 6, wherein the stator is controlled to be energized with a direct current in either the forward or reverse direction by means of an H-bridge circuit.
8. A sample anti-escape sampling method for sampling a celestial body, which is characterized by adopting the anti-escape device as claimed in claim 2, and comprising the following steps:
the method comprises the steps that firstly, a cylindrical linear motor assembly is powered off in an initial state, a rotor stretches out to keep a high-elastic memory alloy wire brushing door assembly to be completely opened, a separation spring is in a compression state, and a sample collection channel is unobstructed;
step two, electrifying a cylindrical linear motor assembly before the sampling task starts, wherein a rotor stretches out to ensure that the high-elastic memory alloy wire brushing door assembly is completely opened, a separation spring is still in a compressed state, and a collected sample is transferred to a packaging container through a sample collection channel of an escape prevention device;
thirdly, after the single sampling is finished, the cylindrical linear motor assembly is electrified with reverse direct current, the rotor overcomes the resistance of the wire brushing door and the magnetic attraction force for maintaining in a power-off state, and then retracts, the high-elastic memory alloy wire brushing door assembly is closed, the separation spring is still in a compressed state, and at the moment, the sample collecting channel is closed to prevent the sample from escaping;
and step four, sequentially repeating until the sampling task is completed, after the cylindrical linear motor assembly is electrified, the rotor is retracted, the high-elastic memory alloy wire brushing door assembly is closed, the compression assembly is unlocked by a initiating explosive device, the separation spring is released, the movable cylinder assembly is retracted towards the fixed cylinder direction, and at the moment, the sample collection channel is completely and physically separated from the sealed container.
CN202310311594.7A 2023-03-28 2023-03-28 Sample escape-preventing device for small celestial body sampling and sampling method Pending CN116698472A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310311594.7A CN116698472A (en) 2023-03-28 2023-03-28 Sample escape-preventing device for small celestial body sampling and sampling method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310311594.7A CN116698472A (en) 2023-03-28 2023-03-28 Sample escape-preventing device for small celestial body sampling and sampling method

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CN116698472A true CN116698472A (en) 2023-09-05

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Application Number Title Priority Date Filing Date
CN202310311594.7A Pending CN116698472A (en) 2023-03-28 2023-03-28 Sample escape-preventing device for small celestial body sampling and sampling method

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