CN117791253A - Conductive slip ring based on gallium-based liquid metal and gyroscope - Google Patents
Conductive slip ring based on gallium-based liquid metal and gyroscope Download PDFInfo
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- CN117791253A CN117791253A CN202311827169.XA CN202311827169A CN117791253A CN 117791253 A CN117791253 A CN 117791253A CN 202311827169 A CN202311827169 A CN 202311827169A CN 117791253 A CN117791253 A CN 117791253A
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- 229910001338 liquidmetal Inorganic materials 0.000 title claims abstract description 119
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 229910052733 gallium Inorganic materials 0.000 title claims abstract description 83
- 239000006247 magnetic powder Substances 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims description 13
- -1 polytetrafluoroethylene Polymers 0.000 claims description 12
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 12
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 12
- 239000002238 carbon nanotube film Substances 0.000 claims description 11
- 230000009467 reduction Effects 0.000 claims description 10
- 239000000919 ceramic Substances 0.000 claims description 7
- RHZWSUVWRRXEJF-UHFFFAOYSA-N indium tin Chemical compound [In].[Sn] RHZWSUVWRRXEJF-UHFFFAOYSA-N 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000011889 copper foil Substances 0.000 claims description 6
- 239000011810 insulating material Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
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- 239000002041 carbon nanotube Substances 0.000 description 12
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- 230000008901 benefit Effects 0.000 description 2
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- 229910052799 carbon Inorganic materials 0.000 description 2
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- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
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- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
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- Gyroscopes (AREA)
Abstract
The invention provides a conductive slip ring based on gallium-based liquid metal and a gyroscope, wherein the conductive slip ring comprises: and the stator and the rotor are movably connected. The stator is a closed shell with a hollow inside. A part of the rotor penetrates through the outer wall of the closed shell and is arranged inside the closed shell. The internal cavity enclosed by the stator and the rotor is filled with gallium-based liquid metal. Stator wires are arranged in the stator. The first end of the stator wire is connected with the outside of the airtight shell, and the second end of the stator wire is connected with gallium-based liquid metal. The rotor is internally provided with a rotor lead. The first end of the rotor wire is connected with gallium-based liquid metal, and the second end of the rotor wire is connected with the outside of the airtight shell. The gallium-based liquid metal is internally mixed with soft magnetic powder, and a permanent magnet unit is arranged on one side of the inner cavity, which is far away from the rotor. According to the invention, the magnetic constraint is formed on the gallium-based liquid metal added with the soft magnetic powder by the magnetic material, so that the aggregation of the gallium-based liquid metal at the joint of the stator and the rotor is reduced, and the leakage of the liquid metal at the joint of the stator and the rotor is reduced.
Description
Technical Field
The invention relates to the technical field of micro-electro-mechanical systems, in particular to a conductive slip ring and a gyroscope based on gallium-based liquid metal.
Background
Micro-Electro-Mechanical Systems (MEMS) gyroscopes are miniaturized, low-power-consumption and high-performance angular velocity measuring tools and have wide application in the fields of industrial manufacturing, mineral drilling and the like. In some applications in specific fields, such as measuring the angular velocity of a drilling probe, it is difficult to interconnect the two by wires, because the signal output end of the gyroscope on the object to be measured and the last information receiving end are not in the same motion state. In the existing gyroscopes, in order to solve the problem of rotatability of the signal connector, a mechanical conductive slip ring or a liquid metal conductive slip ring is generally adopted.
After the movable end of the mechanical conductive slip ring is contacted with the fixed end, the mechanical conductive slip ring relatively rotates and slides, is easy to wear during high-speed rotation application, and has a complex mechanical structure and short service life. The liquid metal conductive slip ring is filled with mercury metal in the closed cavity, and the movable end and the fixed end are electrically connected through the liquid metal, so that mechanical abrasion caused by direct contact is avoided. However, in drilling applications, high temperature, high pressure, high rotational speed and strong vibrations tend to cause leakage of liquid mercury metal at the movable connection of the stator and rotor.
Disclosure of Invention
The invention provides a gallium-based liquid metal-based conductive slip ring and a gyroscope, which are used for solving the problem that the liquid metal in the conventional liquid metal conductive slip ring is easy to leak.
In a first aspect, the present invention provides an electrically conductive slip ring based on gallium-based liquid metal, comprising: and the stator and the rotor are movably connected, wherein the stator and the rotor are made of insulating materials. The stator is a closed shell with a hollow inside. And a part of the rotor penetrates through the outer wall of the closed shell and is arranged inside the closed shell. And a gallium-based liquid metal is filled in an inner cavity enclosed by the stator and the rotor. And a stator wire is arranged in the stator. The first end of the stator wire is connected with the outside of the airtight shell, and the second end of the stator wire is connected with the gallium-based liquid metal. And a rotor lead is arranged in the rotor. The first end of the rotor wire is connected with the gallium-based liquid metal, and the second end of the rotor wire is connected with the outside of the airtight shell. The gallium-based liquid metal is internally mixed with soft magnetic powder, and one side of the inner cavity, which is far away from the rotor, is provided with a permanent magnet unit.
In one possible implementation, the second end of the stator wire is disposed on a side of the interior cavity remote from the rotor. The first end of the rotor wire extends a predetermined length in the interior cavity in a direction away from the rotor to extend into the gallium-based liquid metal.
In one possible implementation, the soft magnetic powder is iron powder. The permanent magnet unit is a permanent magnet coating coated on the inner wall of the inner cavity far away from the rotor.
In one possible implementation, the stator and the rotor are movably connected by a ceramic ball bearing.
In one possible implementation, the material of the stator and rotor is polytetrafluoroethylene. The inner surface of the closed shell of the stator and the outer surface of the rotor are both lyophobic surfaces after femtosecond laser treatment.
In one possible implementation, the method further includes: and the vibration reduction unit is of a multi-layer carbon nano tube film structure. The vibration reduction unit is arranged around the stator and fixedly connected with the stator.
In one possible implementation, copper foil is disposed between the carbon nanotube films of each layer.
In one possible implementation, there are a plurality of stator wires and a plurality of rotor wires. Along the direction of the rotating shaft of the rotor, the rotor and the stator enclose a plurality of mutually isolated internal cavities. One stator wire and one rotor wire are provided for each internal cavity.
In one possible implementation, the gallium-based liquid metal is gallium indium tin alloy.
In a second aspect, the invention provides a gyroscope comprising a gallium-based liquid metal based conductive slip ring as claimed in any one of claims 1 to 9.
The invention provides a conductive slip ring based on gallium-based liquid metal and a gyroscope, wherein the conductive slip ring comprises: and the stator and the rotor are movably connected, wherein the stator and the rotor are made of insulating materials. The stator is a closed shell with a hollow inside. A part of the rotor penetrates through the outer wall of the closed shell and is arranged inside the closed shell. The internal cavity enclosed by the stator and the rotor is filled with gallium-based liquid metal. Stator wires are arranged in the stator. The first end of the stator wire is connected with the outside of the airtight shell, and the second end of the stator wire is connected with gallium-based liquid metal. The rotor is internally provided with a rotor lead. The first end of the rotor wire is connected with gallium-based liquid metal, and the second end of the rotor wire is connected with the outside of the airtight shell. The gallium-based liquid metal is internally mixed with soft magnetic powder, and a permanent magnet unit is arranged on one side of the inner cavity, which is far away from the rotor. According to the invention, on one hand, the gallium-based liquid metal with larger surface tension is adopted as the electric connection liquid between the stator and the rotor of the conductive slip ring, so that the leakage of the liquid metal at the connection part of the stator and the rotor is reduced. On the other hand, soft magnetic powder is added into the gallium-based liquid metal, and a magnetic material is arranged on the inner wall of the cavity far away from the rotor, and the magnetic material forms magnetic restraint on the gallium-based liquid metal added with the soft magnetic powder, so that aggregation of the gallium-based liquid metal at the joint of the stator and the rotor is reduced, and leakage of the liquid metal at the joint of the stator and the rotor is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a prior art liquid metal conductive slip ring;
fig. 2 is a schematic structural diagram of a conductive slip ring based on gallium-based liquid metal according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional structure of a stator mold according to an embodiment of the present invention.
Detailed Description
In order to make the present solution better understood by those skilled in the art, the technical solution in the present solution embodiment will be clearly described below with reference to the accompanying drawings in the present solution embodiment, and it is obvious that the described embodiment is an embodiment of a part of the present solution, but not all embodiments. All other embodiments, based on the embodiments in this solution, which a person of ordinary skill in the art would obtain without inventive faculty, shall fall within the scope of protection of this solution.
The term "comprising" in the description of the present solution and the claims and in the above-mentioned figures, as well as any other variants, means "including but not limited to", intended to cover a non-exclusive inclusion, and not limited to only the examples listed herein. Furthermore, the terms "first" and "second," etc. are used for distinguishing between different objects and not for describing a particular sequential order.
The implementation of the invention is described in detail below with reference to the specific drawings:
fig. 1 is a schematic structural view of a liquid metal conductive slip ring in the prior art. Fig. 1 is a schematic sectional structure of a conventional liquid metal conductive slip ring along a rotor shaft direction. Referring to fig. 1, a conventional liquid metal conductive slip ring may include a stator and a rotor. The rotor extends into a cavity of the stator, which cavity is filled with a liquid metal, such as liquid mercury. The rotor rotates relative to the stator, and the rotor and the stator are electrically connected through liquid metal. Referring to the dashed line box in fig. 1, the movable connection between the stator and the rotor is shown. In drilling applications, high temperature, high pressure, high rotational speed and strong vibration easily cause leakage of liquid mercury metal at the movable connection of the stator and the rotor.
The embodiment of the invention provides a gallium-based liquid metal-based conductive slip ring, which is characterized in that gallium-based liquid metal with larger surface tension is adopted, soft magnetic powder is added into the gallium-based liquid metal, and a magnetic material is arranged on the inner wall of a cavity far away from a rotor to form magnetic restraint, so that aggregation of the gallium-based liquid metal at the joint of a stator and a rotor is reduced, and the problem that the liquid metal in the conventional liquid metal conductive slip ring is easy to leak is solved.
Fig. 2 is a schematic structural diagram of a conductive slip ring based on gallium-based liquid metal according to an embodiment of the present invention. Referring to fig. 2, the conductive slip ring includes: and the stator and the rotor are movably connected, wherein the stator and the rotor are made of insulating materials. The stator is a closed shell with a hollow inside. A part of the rotor penetrates through the outer wall of the closed shell and is arranged inside the closed shell. The internal cavity enclosed by the stator and the rotor is filled with gallium-based liquid metal. Stator wires are arranged in the stator. The first end of the stator wire is connected with the outside of the airtight shell, and the second end of the stator wire is connected with gallium-based liquid metal. The rotor is internally provided with a rotor lead. The first end of the rotor wire is connected with gallium-based liquid metal, and the second end of the rotor wire is connected with the outside of the airtight shell. The gallium-based liquid metal is internally mixed with soft magnetic powder, and a permanent magnet unit is arranged on one side of the inner cavity, which is far away from the rotor.
In some embodiments, the stator and the rotor are movably coupled. The stator and the rotor can relatively rotate. The stator may be rotated and the rotor may be stationary, or the stator may be stationary and the rotor may be rotated with respect to the earth reference system. For ease of description, the following description will be given in terms of application in which the stator is stationary and the rotor rotates.
In some embodiments, the stator and the rotor are movably connected by ceramic ball bearings.
The ceramic ball bearing, also called ceramic bearing, is that the outer ring, the inner ring, the rolling body and the retainer of the bearing are all made of ceramic materials. The advantages of the ceramic ball bearing include: high limit rotation speed, good precision retention, small starting moment, high rigidity, good dry running property and long service life, is very suitable for maintaining high precision and long-time operation under high-speed, high-temperature and corrosion and radiation conditions.
In some embodiments, the material of the stator and rotor is an insulating material.
Here, it should be noted that the stator is in direct contact with the rotor to seal the cavity of the stator. When the material of the stator and the rotor is an electrically conductive material, the current is directly conducted from the stator to the rotor, which is only suitable for one-way transmission. Conductive slip rings are commonly used to transmit multiple signals, so the materials of the stator and rotor can be provided as insulating materials to facilitate multiplexing by providing multiple wires inside.
In some embodiments, the stator is a closed housing that is hollow inside. That is, the inside of the stator is provided with a cavity for accommodating the liquid metal.
Illustratively, the outer wall of the hermetic shell is provided with a through-hole for disposing the rotor such that a portion of the rotor may be disposed inside the stator for electrical connection.
In some embodiments, a portion of the rotor is disposed inside the hermetic shell through an outer wall of the hermetic shell. Further, the rotor may be electrically connected to the inside of the stator.
Illustratively, another portion of the rotor is disposed outside of the hermetic shell for fixedly coupling to the inertial sensor. The rotor rotates in synchronization with the inertial sensor.
In some embodiments, a portion of the rotor is disposed inside the hermetic shell, and the stator and the rotor, in turn, enclose an internal cavity.
In some embodiments, the internal cavity enclosed by the stator and the rotor is filled with gallium-based liquid metal.
Illustratively, the gallium-based liquid metal is gallium indium tin alloy.
Gallium indium tin alloys have unique physical properties. When the proportion of gallium, indium and tin alloy is 68.5 percent of gallium, 21.5 percent of indium and 10 percent of tin, the melting point is-19 ℃ under standard atmospheric pressure, the boiling point is more than 1300 ℃, and the alloy has the characteristics of low melting point, high boiling point, good fluidity, no toxicity, environmental protection and the like. At normal temperature, the alloy is a liquid metal. The alloy has good electric conductivity and heat conductivity, is stable in air, is not easy to generate oxidation reaction, and is suitable for being used as a connecting liquid between a conductive slip ring stator and a rotor.
In some embodiments, stator wires are provided within the stator. The first end of the stator wire is connected with the outside of the airtight shell, and the second end of the stator wire is connected with gallium-based liquid metal.
The first end of the stator wire is used for being connected with an upper computer and can receive sensor signals transmitted by the conductive slip ring.
Illustratively, the second end of the stator wire is disposed within the stator and may be disposed on either side wall of the interior cavity. For example, the internal cavity may be in the shape of a torus, and the second end of the stator wire may be disposed on the top, bottom, or cylindrical sides of the torus. It should be noted here that the central ring of the ring column is a rotor, and the stator wires cannot be arranged on the rotor due to different motion states.
In some embodiments, rotor wires are provided within the rotor. The first end of the rotor wire is connected with gallium-based liquid metal, and the second end of the rotor wire is connected with the outside of the airtight shell.
Illustratively, the rotor and stator define an internal cavity, a portion of the surface of the rotor serves as a sidewall of the internal cavity, and correspondingly, the first ends of the rotor conductors are disposed on the sidewall such that the first ends may be connected to the gallium-based liquid metal within the internal cavity.
For example, the second end of the rotor wire may be connected to an inertial sensor that rotates in synchronization with the rotor.
In some embodiments, the gallium-based liquid metal is mixed with soft magnetic powder, and a permanent magnet unit is arranged on the side of the inner cavity away from the rotor.
Illustratively, the soft magnetic material may be magnetized by an external magnetic field and generate a magnetic field within it that is in the same direction as the magnetization. After the external magnetic field is removed, the soft magnetic material may revert to a non-magnetic state.
Illustratively, the permanent magnet unit may magnetize the soft magnetic powder mixed in the gallium-based liquid metal and generate attraction force to the magnetized soft magnetic powder, thereby pulling the gallium-based liquid metal toward the permanent magnet unit.
Illustratively, the permanent magnet unit is disposed on a side of the interior cavity remote from the rotor. The internal cavity is symmetrically disposed about the rotor axis. The portion of the internal cavity close to the central shaft is closer to the rotor, and the portion of the internal cavity far away from the central shaft is farther from the rotor.
According to the embodiment of the invention, the permanent magnet unit is arranged on one side of the inner cavity far away from the rotor, so that magnetic restraint can be formed on the gallium-based liquid metal, and aggregation of the gallium-based liquid metal at the joint of the stator and the rotor is reduced.
Illustratively, the soft magnetic powder is an iron powder. The permanent magnet unit is a permanent magnet coating coated on the inner wall of the inner cavity far away from the rotor.
For the problem of fixing liquid metal in a cavity, a small amount of iron powder is added into the gallium indium tin liquid alloy, so that the liquid metal has certain magnetism. The magnetic paint is coated on the side of the cavity far away from the rotor, and the paint is made of magnetic powder and film forming agent and can be adsorbed on the polytetrafluoroethylene shell. The magnetic coating forms a cavity structure with certain constraint, and can adsorb liquid metal containing iron powder on the inner wall of the cavity.
Referring to fig. 2, in one possible implementation, there are a plurality of stator wires and a plurality of rotor wires. Along the direction of the rotating shaft of the rotor, the rotor and the stator enclose a plurality of mutually isolated internal cavities. One stator wire and one rotor wire are provided for each internal cavity.
Illustratively, the number of stator conductors, rotor conductors is the same as the number of internal cavities.
For the rotatable interface of the multiple channels, gallium indium tin liquid alloy in the middle inner cavity is subjected to layering treatment to form a multi-inner cavity longitudinal arrangement structure, each inner cavity is an independent signal channel, and the stator and the rotor are respectively provided with a wire through hole communicated with each inner cavity, so that the multiple channels are connected. The middle cavity liquid metal is injected through the wire through hole. It is particularly noted that the wires in the vias may not be aluminum wires, and that aluminum metal may react with gallium metal to destroy the structure and electrical connection of the interface.
In one possible implementation, the second end of the stator wire is disposed on a side of the interior cavity remote from the rotor. The first end of the rotor wire extends a predetermined length in a direction away from the rotor within the interior cavity to extend into the gallium-based liquid metal.
The direction away from the rotor may be, for example, a direction perpendicular to the axis of rotation of the rotor, the direction pointing from the rotor to the stator.
When the stator is fixed and the rotor rotates, the liquid metal is driven in the inner cavity to rotate along the rotor, and the liquid metal gathers in a direction away from the axis of the rotor under the action of centrifugal force. Accordingly, cavitation may occur in a portion closer to the rotor, thereby making the rotor wire not contact with the liquid metal. Therefore, the rotor wire is extended away from the rotor, so that the rotor wire can extend into the gallium-based liquid metal when the rotor rotates.
According to the embodiment of the invention, on one hand, the gallium-based liquid metal with larger surface tension is adopted as the electric connection liquid between the stator and the rotor of the conductive slip ring, so that the leakage of the liquid metal at the connection part of the stator and the rotor is reduced. On the other hand, soft magnetic powder is added into the gallium-based liquid metal, and a magnetic material is arranged on the inner wall of the cavity far away from the rotor, and the magnetic material forms magnetic restraint on the gallium-based liquid metal added with the soft magnetic powder, so that aggregation of the gallium-based liquid metal at the joint of the stator and the rotor is reduced, and leakage of the liquid metal at the joint of the stator and the rotor is reduced.
Under the strong shock and strong vibration environment, the liquid leakage problem of the liquid metal cavity is easy to occur, and then the signal is short-circuited or broken, so that the rotary conductive slip ring is damaged. To solve this problem, it is necessary that the liquid metal can be held in the cavity, and the junction of the cavity and the rotor end has a repulsive interaction with the liquid metal, preventing the liquid metal from leaking through the rotor end junction.
The shell with a single structure is filled with gallium-based liquid metal, no abrasion exists between the liquid metal and the rotor lead, and the abrasion damage probability is reduced.
In one possible implementation, the material of the stator and rotor is polytetrafluoroethylene. The inner surface of the closed shell of the stator and the outer surface of the rotor are lyophobic surfaces treated by femtosecond laser.
The material is made of polytetrafluoroethylene, has excellent heat resistance and cold resistance, and can be used for a long time at-180-260 ℃. The material has the characteristics of acid resistance, alkali resistance and resistance to various organic solvents, is almost insoluble in all solvents, and can bear high-temperature and high-pressure working environments when the underground drill bit works. The material can form an ultra-lyophobic liquid metal surface structure by a femtosecond laser method, repels liquid metal in contact with the surface, and can limit the leakage of the liquid metal from the cavity.
And performing femtosecond laser treatment on polytetrafluoroethylene materials at the connecting part of the stator and the rotor to form an ultra-lyophobic metal structure. The structure has certain repulsive force to the liquid metal, and can effectively reduce the leakage problem of the liquid metal cavity under the vibration condition.
According to the embodiment of the invention, the lyophobic surface is prepared by adopting polytetrafluoroethylene materials and performing femtosecond laser treatment, so that gallium-based liquid metal is repelled, aggregation of the gallium-based liquid metal at the stator and the rotor is reduced, and leakage of the liquid metal is reduced. The device is suitable for the working environment bearing high temperature and high pressure when the underground drill bit works.
In one possible implementation, the method further includes: and the vibration reduction unit is of a multi-layer carbon nano tube film structure. The vibration reduction unit is arranged around the stator and fixedly connected with the stator.
The vibration damping unit is composed of carbon nanotubes, and is designed to absorb energy brought by vibration by utilizing the unique physical properties of the carbon nanotubes, and convert the energy into heat energy to be dissipated. The carbon nano tube is of a multi-layer lattice structure, when the external vibration acts on the carbon nano tube, the lattice size of the carbon nano tube is slightly changed to generate deformation, and the deformation finally converts the vibration energy into internal energy, so that the vibration is absorbed, and the vibration influence is reduced. Carbon nanotubes also have good thermal conductivity, which allows the structure to transfer thermal energy generated by vibration out at a rapid rate. The rapid heat conduction property enables the carbon nano tube to continuously transfer heat energy generated by vibration, and the inside of the system is not overheated. And the carbon nano tube also has good electromagnetic shielding capability, and can protect the material wrapped inside from electromagnetic shielding interference.
According to the embodiment of the invention, the vibration reduction unit is arranged to reduce external vibration, so that leakage of liquid metal is reduced.
The vibration damping unit is illustratively a three-dimensional wrap-around structure. For example, a carbon nanotube film vibration damping structure is bonded to the outside of the polytetrafluoroethylene shell. The vibration damping structure is a cylindrical carbon nanotube film gasket with an upper opening and a lower opening. When in bonding, firstly, polytetrafluoroethylene and a carbon nano tube gasket are subjected to surface cleaning treatment, and after surface roughness and adhesion are increased by polishing, sand blasting and other methods, polytetrafluoroethylene shells are tightly wrapped on the upper vibration reduction structure and the lower vibration reduction structure.
Further, the rotatable conductive slip ring structure is fixed by two aluminum alloy shells through a laser seal welding process. The aluminum alloy shell can apply certain pressure to the rubber vibration damping pad, so that the vibration damping unit can be better attached to the polytetrafluoroethylene shell, and better vibration damping performance is achieved.
In one possible implementation, copper foil is provided between the carbon nanotube films of each layer.
The carbon nanotube film vibration damping structure is formed by stacking a plurality of layers of carbon nanotube films, wherein the thickness of a single layer of carbon nanotube is 0.08mm, the middle of each layer of carbon nanotube is connected by copper foil, and the vibration damping structure with the thickness of 1mm is manufactured in a carbon nanotube-copper foil-carbon nanotube-copper foil mode. The copper foil has the function of increasing electromagnetic shielding performance and better transferring heat generated by vibration in the carbon nano tube.
In one possible implementation, the material of the damping unit may also be rubber.
In one possible implementation, the vibration damping device further comprises an aluminum alloy shell, and the vibration damping unit is arranged around the vibration damping unit and fixedly connected with the vibration damping unit.
The present invention provides a gyroscope comprising a gallium-based liquid metal based conductive slip ring as provided in any one of the possible implementations described above.
Illustratively, the gyroscope is a single analog signal output gyroscope. The advantage of this is: the interface design is miniaturized and generalized, and the gyroscope can be normally used only by a rotatable interface comprising three wires (power supply, ground wire and signal wire), so that the problems of complex interface design, high cost and the like are avoided.
Fig. 3 is a schematic cross-sectional structure of a stator mold according to an embodiment of the present invention. Referring to fig. 3, for the fabrication of the rotatable interface based on liquid metal, first, a mold having the same size as the rotor and the liquid metal cavity is formed according to the size specification, the buried lead is placed in a fixed position of the mold, tetrafluoroethylene monomer and polytetrafluoroethylene catalyst are placed in the mold by a liquid phase polymerization method, the catalyst promotes polymerization reaction in a liquid environment, and the stator is integrally fabricated. After the stator is manufactured, the magnetic paint is coated in the liquid metal cavity. And forming an ultra-lyophobic metal layer by using femtosecond laser at the contact part of the stator and the rotor to block the flow of liquid metal. After the gallium indium tin liquid metal doped with iron powder is poured into the three-layer cavity, the rotor is inserted, and the ceramic bearing is fixed, so that the internal structure of the rotatable interface is formed. The upper end and the lower end of the internal structure are nested with customized carbon nanotube film vibration reduction units, and then two semi-cylindrical aluminum alloy shells are fixed on the outer side by a laser sealing method. And the manufacture of the rotatable conductive slip ring of the liquid metal with strong vibration resistance is completed.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting. Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A gallium-based liquid metal-based conductive slip ring, comprising: the motor comprises a stator and a rotor which are movably connected, wherein the stator and the rotor are made of insulating materials;
the stator is a closed shell with a hollow inside;
a part of the rotor penetrates through the outer wall of the closed shell and is arranged in the closed shell;
the internal cavity enclosed by the stator and the rotor is filled with gallium-based liquid metal;
a stator wire is arranged in the stator; the first end of the stator wire is connected with the outside of the closed shell, and the second end of the stator wire is connected with the gallium-based liquid metal;
a rotor lead is arranged in the rotor; the first end of the rotor wire is connected with the gallium-based liquid metal, and the second end of the rotor wire is connected with the outside of the closed shell;
the gallium-based liquid metal is internally mixed with soft magnetic powder, and one side of the inner cavity, which is far away from the rotor, is provided with a permanent magnet unit.
2. A gallium-based liquid metal-based conductive slip ring as defined in claim 1, wherein the second end of the stator wire is disposed on a side of the interior cavity remote from the rotor;
the first end of the rotor wire extends a predetermined length in the interior cavity in a direction away from the rotor to extend into the gallium-based liquid metal.
3. A gallium-based liquid metal-based conductive slip ring according to claim 1, wherein the soft magnetic powder is iron powder;
the permanent magnet unit is a permanent magnet coating coated on the inner wall of the inner cavity far away from the rotor.
4. The gallium-based liquid metal-based conductive slip ring of claim 1, wherein the stator and rotor are movably connected by ceramic ball bearings.
5. A gallium-based liquid metal-based conductive slip ring as claimed in claim 1, wherein the stator and rotor materials are polytetrafluoroethylene;
the inner surface of the closed shell of the stator and the outer surface of the rotor are both lyophobic surfaces after femtosecond laser treatment.
6. The gallium-based liquid metal-based conductive slip ring of claim 1, further comprising: the vibration reduction unit is of a multi-layer carbon nano tube film structure;
the vibration reduction unit is arranged around the stator and fixedly connected with the stator.
7. The gallium-based liquid metal-based conductive slip ring according to claim 6, wherein copper foil is provided between each layer of the carbon nanotube film.
8. The gallium-based liquid metal-based conductive slip ring of claim 1, wherein there are a plurality of stator wires and a plurality of rotor wires;
along the rotating shaft direction of the rotor, the rotor and the stator enclose a plurality of mutually isolated internal cavities;
one stator wire and one rotor wire are provided for each internal cavity.
9. The gallium-based liquid metal-based conductive slip ring of claim 1, wherein the gallium-based liquid metal is gallium indium tin alloy.
10. A gyroscope comprising a gallium-based liquid metal-based conductive slip ring according to any of claims 1 to 9.
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| CN202311827169.XA CN117791253A (en) | 2023-12-27 | 2023-12-27 | Conductive slip ring based on gallium-based liquid metal and gyroscope |
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