CN112145511B - Movement mechanism locking device and locking method based on inverse flexoelectric effect - Google Patents
Movement mechanism locking device and locking method based on inverse flexoelectric effect Download PDFInfo
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- CN112145511B CN112145511B CN202011022388.7A CN202011022388A CN112145511B CN 112145511 B CN112145511 B CN 112145511B CN 202011022388 A CN202011022388 A CN 202011022388A CN 112145511 B CN112145511 B CN 112145511B
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- 230000000694 effects Effects 0.000 title claims abstract description 43
- 230000007246 mechanism Effects 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims abstract description 54
- 239000002184 metal Substances 0.000 claims abstract description 54
- 239000003989 dielectric material Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 13
- 230000005684 electric field Effects 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 5
- 229910052454 barium strontium titanate Inorganic materials 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 239000013078 crystal Substances 0.000 abstract description 4
- 230000001808 coupling effect Effects 0.000 abstract description 2
- 239000002585 base Substances 0.000 description 10
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000002305 electric material Substances 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B1/00—Devices for securing together, or preventing relative movement between, constructional elements or machine parts
- F16B1/02—Means for securing elements of mechanisms after operation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The invention discloses a locking device and a locking method of a movement mechanism based on an inverse flexoelectric effect, wherein the locking device comprises a support rod, a sensitive unit and a plurality of metal blocks with arc structures, wherein the support rod, the sensitive unit and the metal blocks are arranged on a base; the supporting rod is vertically arranged on the base, the sensitive unit is of an annular structure and is horizontally arranged at the top of the supporting rod; a plurality of metal blocks are uniformly arranged on the outer ring of the sensitive unit; the outer rings of the metal blocks are provided with annular insulating strips; a gap is arranged between the outer ring of the annular insulating strip and the inner shell of the cup body of the rotating device; the sensing unit is made of a flexible dielectric material, and the inner side and the outer side of the sensing unit are respectively plated with an inner metal electrode and an outer metal electrode. The invention realizes the position locking of the moving part based on the flexoelectric effect in the crystal force-electricity coupling effect. Compared with the traditional electromagnet, mechanical buckle or locking screw, the novel electromagnetic locking device has the advantages of simple use, convenience in disassembly and assembly and no need of complex mechanical structures.
Description
Technical Field
The invention relates to the technical field of equipment manufacturing, in particular to a movement mechanism locking device and method based on an inverse flexoelectric effect.
Background
In aerospace equipment, some rotating parts need to be positioned in the processes of lifting, descending and working, and are usually locked with a base by adopting an electromagnet, a mechanical buckle or a locking screw, so that the high-precision positioning relation is kept. However, the locking method has some problems in use, such as inconvenient operation, manual field intervention and the like. Especially for the rotary cup with a thin-wall structure, when the local position is locked by an electromagnet or a locking screw, the local stress of the cup body is easy to deform under the action of external force, and the later normal use can be influenced.
Disclosure of Invention
The invention aims to provide a movement mechanism locking device and a movement mechanism locking method based on inverse flexoelectric effect, wherein the inverse flexoelectric effect is generated when power is applied by utilizing the linear relation between strain gradient generated by a sensitive unit and electric charge, and the sensitive unit of a horizontally placed annular structure generates radial direction displacement to press a thin-wall cylinder rotating device to realize locking and positioning with a base; when the power supply is stopped, the locking is released and the rotating device is restored to the free state.
The invention adopts the following technical scheme:
a movement mechanism locking device based on the inverse flexoelectric effect comprises a base and a rotating device arranged on the upper portion of the base, wherein the rotating device is a round cup body structure with a downward cup opening; the locking device comprises a supporting rod, a sensitive unit and a plurality of metal blocks with arc structures, wherein the supporting rod, the sensitive unit and the metal blocks are arranged on a base; the supporting rod is vertically arranged on the base, the sensitive unit is of an annular structure and is horizontally arranged at the top of the supporting rod; a plurality of metal blocks are uniformly arranged on the outer ring of the sensitive unit; the outer rings of the metal blocks are provided with annular insulating strips; a gap is arranged between the outer ring of the annular insulating strip and the inner shell of the cup body of the rotating device; the sensing unit is made of a flexible dielectric material, the inner side and the outer side of the sensing unit are respectively plated with an inner metal electrode and an outer metal electrode, and the inner metal electrode and the outer metal electrode are connected to an external power supply through leads.
According to the movement mechanism locking device based on the inverse flexoelectric effect, the annular insulating strip is made of silicon rubber.
In the movement mechanism locking device based on the inverse flexoelectric effect, the metal block is a tungsten block.
According to the movement mechanism locking device based on the inverse flexoelectric effect, the flexoelectric dielectric material is non-polarized barium strontium titanate.
In the motion mechanism locking device based on the inverse flexoelectric effect, the outer metal electrode and the inner metal electrode are gold evaporation plated layers with the thickness of 10 nm.
According to the movement mechanism locking device based on the inverse flexoelectric effect, the support rod is made of stainless steel materials.
According to the movement mechanism locking device based on the inverse flexoelectric effect, the annular insulating strip is bonded between the support rod and the inner ring of the sensitive unit.
According to the movement mechanism locking device based on the inverse flexoelectric effect, the base is provided with the guide pipe through which the lead penetrates.
According to the movement mechanism locking device based on the inverse flexoelectric effect, the gap between the outer ring of the annular insulating strip and the cup body inner shell of the rotating device is in the micron level.
A method for realizing locking of a motion mechanism by a motion mechanism locking device based on an inverse flexoelectric effect is characterized in that: the annular sensitive unit internally generates a strain gradient along the annular radial direction under the action of gravity of a plurality of metal blocks with arc structures; after an external power supply inputs corresponding voltage to the sensitive units through the inner metal electrode and the outer metal electrode, the applied voltage can generate an electric field gradient along the strain gradient direction of the flexoelectric material, so that the sensitive units of the annular structure generate mechanical strain expanding along the annular radial direction, and the annular insulating strips are driven to clamp the inner shell of the cup body of the rotating device, thereby achieving the effect of locking the moving mechanism; when the external power supply voltage is zero, the mechanical strain generated by the sensitive unit returns to zero, a gap state is kept between the annular insulating strip and the cup body inner shell, the locking of the movement mechanism is released, and the movement state is recovered.
Compared with the prior art, the invention has the following advantages:
1. the invention realizes the position locking of the moving part based on the flexoelectric effect in the crystal force-electricity coupling effect. Compare in traditional electro-magnet, mechanical buckle or locking screw have simple to use, easy dismounting, do not need complicated mechanical structure, open through the mode control locking device of control switching power supply in addition, it is simple convenient, do not need the manual operation.
2. According to the invention, based on the structures of the mass block and the annular sensitive unit, the gravity of the mass block acts on the annular sensitive unit, so that a strain gradient in the radial direction is generated inside the sensitive unit, an external voltage acts on the annular sensitive unit, an electric field gradient is generated in the strain gradient direction by a flexoelectric material, and then the annular sensitive unit can generate micron-level mechanical strain through the inverse flexoelectric effect, so that the purpose of locking the mechanical position is achieved. The mechanical strain is uniformly applied to the inner shell of the rotating device for one circle, so that the uneven stress caused when the local position of the rotating device is locked by a traditional locking mechanism is prevented, and the mechanical strain locking mechanism is particularly suitable for the position locking of a thin-wall cylinder device.
3. Compared with other crystal materials, the flexible electric material is not limited by Curie temperature, has wide application range to external environment temperature and has better durability.
Drawings
Fig. 1 is a structural section view of the locking device of the invention when locked.
Fig. 2 is a cross-sectional view of the unlocked configuration of the locking device of the present invention.
Fig. 3 is a top sectional view of the locking device of the present invention when locked.
FIG. 4 is a schematic view of the mechanical strain generated in the radial direction of the sensing unit according to the present invention.
The reference numbers are as follows: 1-base, 2-annular insulating strip, 3-metal block, 4-outside metal electrode, 5-sensitive unit, 6-support rod, 7-inside metal electrode, 8-rotating shaft, 9-rotating device, 10-lead wire, 11-conduit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The flexoelectric effect includes a strain gradient-induced polarization intensity phenomenon, i.e., a positive flexoelectric effect, and an electric field gradient-induced mechanical strain phenomenon, i.e., an inverse flexoelectric effect. Due to the relatively relaxed requirement for crystal structure symmetry, the flexoelectric effect is prevalent in all dielectrics, including non-piezoelectric materials and isotropic materials. The flexoelectric effect has long-term stability, so that the flexoelectric actuator is an ideal sensing element of the actuator.
As shown in figure 1, aiming at the locking and positioning problem of a rotating device 9 of a thin-wall round cup body structure, the invention provides a movement mechanism locking device based on an inverse flexoelectric effect. In the research of aerospace equipment, a certain motion mechanism needs to be locked in position, the motion mechanism can be simplified into a rotating device 9 and a base 1 through a model, the rotating device 9 is a thin-wall round cup body structure with a downward cup opening, if the traditional screw locking is adopted, on one hand, human intervention is needed, on the other hand, the screw is pressed against the local position of the cup body, and the deformation of the thin-wall cup body can be caused when the screw is locked for a long time, so that the working state of the thin-wall cup body is influenced.
As shown in fig. 1 to 3, the locking device comprises a support rod 6, a sensitive unit 5 and a plurality of metal blocks 3 arranged on a base 1; the supporting rod 6 is vertically arranged on the base 1, the sensitive unit 5 is of an annular structure and is horizontally arranged at the top of the supporting rod 6; a plurality of metal blocks 3 are uniformly arranged on the outer ring of the sensitive unit 5; the metal block 3 is an arc-shaped tungsten block, the inner diameter of the arc is 40mm, the outer diameter of the arc is 50mm, and the thickness of the arc is 5 mm. In fig. 3, four metal blocks 3 are uniformly distributed around the sensing unit 5, and a gap of several millimeters is maintained between the metal blocks 3 and the metal blocks 3. The outer rings of the metal blocks 3 are sleeved with annular insulating strips 2; the annular insulating strip 2 is made of insulating, acid and alkali resistant and high temperature resistant silicon rubber and is bonded to the outer ring of the metal block 3 to play a role in locking the rotating device 9.
A micron-level gap is arranged between the annular insulating strip 2 and the cup body inner shell of the rotating device 9; the sensing unit 5 is made of a flexoelectric dielectric material, the inner side and the outer side of the sensing unit 5 are respectively plated with an inner metal electrode 7 and an outer metal electrode 4, the electrodes are gold evaporation plated layers with the thickness of 10nm, and the inner metal electrode 7 and the outer metal electrode 4 are connected to an external power supply through leads 10. The sensitive unit 5 is a circular ring body made of a flexible dielectric electric material made of a non-polarized barium strontium titanate material, and has the inner diameter of 10mm, the outer diameter of 40mm and the height of 5 mm. The metal block 3 and the sensitive unit 5 are connected in an adhesion mode.
The base 1 is provided with a guide tube 11 through which the lead wire 10 penetrates, and the guide tube 11 is a plastic tube and is fixed on the base 1. The support rod 6 is made of stainless steel material, and the inner ring of the sensitive unit 5 is bonded on the support rod 6. In a preferred embodiment, an annular insulating strip 2 is bonded between the support rod 6 and the inner ring of the sensitive unit 5. The strength of the supporting rod is ensured, and meanwhile, the circuit insulation effect is achieved.
The working principle of the invention is as follows:
the inverse flexoelectric effect refers to the phenomenon of mechanical strain induced by electric field gradient. When the locking device is powered on, due to the inverse flexoelectric effect, the annular sensitive unit 5 is bent along the radial direction under the action of the gravity of the metal blocks 3 with the arc structures, the strain in the radial direction is generated inside, the strain value on each section is the same, and therefore uniform strain gradient is generated along the radial direction, and the expression is that
In the formula, mu is a flexural electric coefficient, Q is an applied external charge, A is the area of the annular sensitive unit, R is the annular width of the annular sensitive unit, and epsilon is strain.
By integrating the above formula, the total displacement of the flexoelectric material along the radial direction under the action of the external electric field can be obtained, and the expression is
Wherein S is the total displacement of the flexoelectric material in the radial direction.
From the above formula, as long as an external electric field is input, the linear relationship between the strain gradient generated by the sensing unit and the electric charge generated based on the flexoelectric effect enables the sensing unit 5 with the annular structure to generate mechanical strain along the annular radial direction, and drives the annular insulating strip 2 to clamp the inner shell of the cup body of the rotating device 9, so as to achieve the effect of locking the moving mechanism.
As shown in fig. 4, the sensing unit 5 generates a strain gradient in an annular radial direction inside under the action of gravity of the metal block 3; after an external power supply inputs corresponding voltage to the sensing unit 5 through the inner metal electrode 7 and the outer metal electrode 4, the applied voltage generates an electric field gradient along the strain gradient direction of the flexoelectric material, so that the sensing unit 5 with an annular structure generates mechanical strain along the annular radial direction (as shown in the direction of an arrow in fig. 4), that is, the outer ring of the sensing unit is uniformly enlarged, the diameter of the outer ring is increased by a micrometer scale, so that the metal block is expanded along the radial direction of the supporting rod, and the annular insulating strip 2 blocks the inner cup shell of the rotating device 9, thereby achieving the effect of locking the moving mechanism (as shown in fig. 2); when the external power supply voltage is zero, the mechanical strain generated by the sensing unit 5 returns to zero, a gap state (shown in fig. 2) is kept between the annular insulating strip 2 and the cup body inner shell, the locking of the movement mechanism is released, and the rotation device 9 can restore the movement state.
The invention realizes the position locking of the motion mechanism by controlling the external power supply applied to the flexoelectric dielectric material, has the characteristics of automatic control, wider applicable temperature range, higher service reliability and the like, and is suitable for the mechanism locking in special occasions.
Claims (10)
1. The utility model provides a kinematic mechanism locking device based on reverse flexoelectric effect, the kinematic mechanism include base (1) and base (1) upper portion rotation device (9) that set up, rotation device (9) be the round cup structure of rim of a cup down, its characterized in that: the locking device comprises a supporting rod (6) arranged on the base (1), a sensitive unit (5) and a plurality of metal blocks (3) with arc structures; the supporting rod (6) is vertically arranged on the base (1), the sensitive unit (5) is of an annular structure and is horizontally arranged at the top of the supporting rod (6); a plurality of metal blocks (3) are uniformly arranged on the outer ring of the sensitive unit (5); the outer rings of the metal blocks (3) are provided with annular insulating strips (2); a gap is arranged between the outer ring of the annular insulating strip (2) and the cup body inner shell of the rotating device (9); the sensing unit (5) is made of a flexoelectric dielectric material, the inner side and the outer side of the sensing unit (5) are respectively plated with an inner metal electrode (7) and an outer metal electrode (4), and the inner metal electrode (7) and the outer metal electrode (4) are connected to an external power supply through leads (10).
2. The inverse flexoelectric effect based motion mechanism locking device according to claim 1, wherein: the annular insulating strip (2) is made of silicon rubber.
3. The inverse flexoelectric effect based motion mechanism locking device according to claim 1, wherein: the metal block (3) is a tungsten block.
4. The inverse flexoelectric effect based motion mechanism locking device according to claim 1, wherein: the flexible dielectric material is non-polarized barium strontium titanate.
5. The inverse flexoelectric effect based motion mechanism locking device according to claim 1, wherein: the outer metal electrode (4) and the inner metal electrode (7) are gold-evaporated layers with the thickness of 10 nm.
6. The inverse flexoelectric effect based motion mechanism locking device according to claim 1, wherein: the support rod (6) is made of stainless steel material.
7. The inverse flexoelectric effect based motion mechanism locking device according to claim 1, wherein: an annular insulating strip (2) is bonded between the support rod (6) and the inner ring of the sensitive unit (5).
8. The inverse flexoelectric effect based motion mechanism locking device according to claim 1, wherein: the base (1) is provided with a guide tube (11) through which the lead (10) penetrates.
9. The inverse flexoelectric effect based motion mechanism locking device according to claim 1, wherein: the clearance between the outer ring of the annular insulating strip (2) and the cup body inner shell of the rotating device (9) is in micron level.
10. The inverse flexoelectric effect-based moving mechanism locking device according to any one of claims 1 to 9, wherein the method for locking the moving mechanism is characterized in that: the annular sensitive unit (5) internally generates a strain gradient along the annular radial direction under the action of gravity of the metal blocks (3) with the arc structures;
when an external power supply inputs corresponding voltage to the sensitive unit (5) through the inner metal electrode (7) and the outer metal electrode (4), the applied voltage can generate an electric field gradient along the strain gradient direction of the flexoelectric material, so that the sensitive unit (5) with an annular structure generates mechanical strain expanding along the annular radial direction, and the annular insulating strip (2) is driven to clamp the inner shell of the cup body of the rotating device (9), thereby achieving the effect of locking a moving mechanism;
when the external power supply voltage is zero, the mechanical strain generated by the sensitive unit (5) returns to zero, a gap state is kept between the annular insulating strip (2) and the cup body inner shell, the locking of the movement mechanism is released, and the movement state is recovered.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011022388.7A CN112145511B (en) | 2020-09-25 | 2020-09-25 | Movement mechanism locking device and locking method based on inverse flexoelectric effect |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011022388.7A CN112145511B (en) | 2020-09-25 | 2020-09-25 | Movement mechanism locking device and locking method based on inverse flexoelectric effect |
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| CN112145511B true CN112145511B (en) | 2021-11-12 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2231412Y (en) * | 1995-03-11 | 1996-07-17 | 西南交通大学 | Claw spring sensitive element force measuring sensor |
| DE19834212A1 (en) * | 1998-07-29 | 2000-02-10 | Siemens Ag | Control device in a motor vehicle and pressure sensor used by this |
| DE102014211856A1 (en) * | 2014-06-20 | 2015-12-24 | Volkswagen Aktiengesellschaft | Pressure sensor with hydrophobic coating |
| CN105650070A (en) * | 2016-04-13 | 2016-06-08 | 浦江特捷锁业有限公司 | Fastening mechanism for elastically fastening |
| CN108953311A (en) * | 2018-09-29 | 2018-12-07 | 南京奥特自动化有限公司 | A kind of magnetic-type locking positioning device |
| CN109212264A (en) * | 2018-10-18 | 2019-01-15 | 长安大学 | The electric acceleration transducer of the shearing flexure of annular and stepped construction acceleration transducer |
| CN209838925U (en) * | 2019-05-08 | 2019-12-24 | 南昌工程学院 | Bionic multi-cavity sucker based on shape memory alloy driving |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5319474B2 (en) * | 2009-09-25 | 2013-10-16 | 未来工業株式会社 | Wiring fixture mounting device |
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2020
- 2020-09-25 CN CN202011022388.7A patent/CN112145511B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2231412Y (en) * | 1995-03-11 | 1996-07-17 | 西南交通大学 | Claw spring sensitive element force measuring sensor |
| DE19834212A1 (en) * | 1998-07-29 | 2000-02-10 | Siemens Ag | Control device in a motor vehicle and pressure sensor used by this |
| DE102014211856A1 (en) * | 2014-06-20 | 2015-12-24 | Volkswagen Aktiengesellschaft | Pressure sensor with hydrophobic coating |
| CN105650070A (en) * | 2016-04-13 | 2016-06-08 | 浦江特捷锁业有限公司 | Fastening mechanism for elastically fastening |
| CN108953311A (en) * | 2018-09-29 | 2018-12-07 | 南京奥特自动化有限公司 | A kind of magnetic-type locking positioning device |
| CN109212264A (en) * | 2018-10-18 | 2019-01-15 | 长安大学 | The electric acceleration transducer of the shearing flexure of annular and stepped construction acceleration transducer |
| CN209838925U (en) * | 2019-05-08 | 2019-12-24 | 南昌工程学院 | Bionic multi-cavity sucker based on shape memory alloy driving |
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