CN113223762B - Anti-electromagnetic interference shielding cable and dynamometer with same - Google Patents
Anti-electromagnetic interference shielding cable and dynamometer with same Download PDFInfo
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- CN113223762B CN113223762B CN202110310389.XA CN202110310389A CN113223762B CN 113223762 B CN113223762 B CN 113223762B CN 202110310389 A CN202110310389 A CN 202110310389A CN 113223762 B CN113223762 B CN 113223762B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/24—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/02—Cables with twisted pairs or quads
- H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
- H01B11/10—Screens specially adapted for reducing interference from external sources
- H01B11/1008—Features relating to screening tape per se
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/02—Cables with twisted pairs or quads
- H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
- H01B11/10—Screens specially adapted for reducing interference from external sources
- H01B11/1033—Screens specially adapted for reducing interference from external sources composed of a wire-braided conductor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
- H01B13/2606—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by braiding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
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- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Physics & Mathematics (AREA)
- Communication Cables (AREA)
- Insulated Conductors (AREA)
Abstract
The invention discloses an anti-electromagnetic interference shielding cable and a dynamometer with the same, wherein the anti-electromagnetic interference shielding cable comprises 16 single-twisted-pair wires, and the outer layer of each single-twisted-pair wire is coated with a first layer of tin foil paper; every two single twisted pairs are twisted in pairs to form 8 composite twisted pairs, the outer layer of each composite twisted pair is coated with a second layer of tinfoil paper, the outer layer of each second layer of tinfoil paper is coated with a first metal shielding layer, and the outer layer of each first metal shielding layer is coated with a third layer of tinfoil paper; embedding the third layer of tin foil paper into the first metal shielding layer at intervals of a preset distance to form a micro-shielding electric ion discharge circulating body; the cable outer layer formed with a plurality of micro-shielding electric ion discharge circulating bodies is coated with a fourth layer of tinfoil paper, the outer layer of the fourth layer of tinfoil paper is coated with a second metal shielding layer, and the outer layer of the second metal shielding layer is coated with a leather sheath. The invention can realize undistorted transmission of signals under the severe conditions of megawatt-level strong magnetic field and high harmonic wave, and has good anti-interference performance.
Description
Technical Field
The invention relates to the technical field of cables, in particular to an anti-electromagnetic interference shielding cable and a dynamometer with the same.
Background
The standard shielding twisted-pair cable which can be purchased on the market is only used in daily use environment, and is used in severe environment facing megawatt power high-intensity magnetic field, high harmonic and serious clutter, low-voltage sine signals are transmitted at an ultra-long distance, and the standard shielding twisted-pair cable is not ideal in the aspects of preventing sine signal distortion and synchronizing signals in real time. In addition, signals are usually very good in other environments, and signals cannot be normally received in environments with high harmonic waves, high noise waves and large magnetic fields.
Chinese patent publication No. CN104835589A, dedicated to 2015, 8 th, 12 th, discloses a shielded cable suitable for noise shielding in a wide frequency band, wherein a shielded cable (1) includes an insulated wire (4) having a conductor wire (2) surrounded by an insulator (3) and a shield layer (7) formed of a shield wire (70) surrounding the insulated wire (4), and the shield wire (70) includes a tubular member (71) formed of a conductive material and a magnetic powder (72) filled in an inner space of the tubular member (71).
Chinese proprietary publication No. CN103456399A, 12 months and 28 years 2013 discloses a shielded cable for a frequency converter, comprising: the cable comprises three insulating main cable cores, wherein an insulating ground cable core is arranged between every two adjacent insulating main cable cores, the insulating main cable cores are twisted pairs, inner shielding layers are arranged outside the insulating main cable cores and outside the insulating ground cable cores, a first total shielding layer is arranged outside the inner shielding layers, a glass fiber cloth flame-retardant layer is arranged outside the first total shielding layer, a second total shielding layer is arranged outside the glass fiber cloth flame-retardant layer, and an outer sheath layer is arranged outside the second total shielding layer. The patent application is mainly used for solving the problem of shielding and resisting interference.
Therefore, the anti-interference performance of the shielded cable has an important influence on field signal receiving and transmitting, and the electromagnetic interference of the shielded cable is very strong in the working environment of a multi-megawatt motor, so that the shielded cable is provided, can be perfectly transmitted under the severe conditions of megawatt strong magnetic fields and high harmonics, and has very important significance in realizing high-speed transmission without signal distortion.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the anti-electromagnetic interference shielding cable and the dynamometer with the same.
According to an aspect of the description of the invention, a shielding cable for resisting electromagnetic interference is provided, wherein the shielding cable is a 16-core twisted-pair shielding cable and comprises 16 single twisted-pair wires, and the outer layer of each single twisted-pair wire is wrapped with a first layer of tin foil paper; every two single twisted pairs are twisted in pairs to form 8 composite twisted pairs, the outer layer of each composite twisted pair is coated with a second layer of tinfoil paper, the outer layer of each second layer of tinfoil paper is coated with a first metal shielding layer, and the outer layer of each first metal shielding layer is coated with a third layer of tinfoil paper; embedding the third layer of tin foil paper into the first metal shielding layer at intervals of 1 meter to form a micro-shielding electric ion discharge circulating body; coating a fourth layer of tinfoil paper on the outer layer of the cable on which a plurality of micro-shielding electric ion discharge circulating bodies are formed, coating a second metal shielding layer on the outer layer of the fourth layer of tinfoil paper, and coating a leather sleeve on the outer layer of the second metal shielding layer; the preset thicknesses of the first layer of tin foil paper, the second layer of tin foil paper and the fourth layer of tin foil paper are all 0.12 mm, and the preset thickness of the third layer of tin foil paper is 0.36-0.96 mm; the preset thickness of the first metal shielding layer is 15 mm; the preset thickness of the second metal shielding layer is 55 mm.
As a further technical scheme, the metal shielding layer is a densely woven phosphor-copper mesh.
As a further technical scheme, third layer tin foil comprises parcel layer and overlayer, the parcel layer cladding is outside first metal shielding layer, the overlayer overlaps by multilayer tin foil and constitutes and imbeds in the first metal shielding layer.
As a further technical solution, the method for manufacturing the anti-electromagnetic interference shielding cable includes:
determining the preset thicknesses of the first layer of tin foil paper, the second layer of tin foil paper, the third layer of tin foil paper, the first metal shielding layer and the second metal shielding layer;
wrapping 16 single-twisted pair wires with a first layer of tin foil paper;
twining every two single twisted pairs into 8 composite twisted pairs, and coating a second layer of tinfoil paper on the outer layer of each composite twisted pair;
sequentially coating a first metal shielding layer and a third layer of tin foil paper outside the second layer of tin foil paper;
embedding the third layer of tin foil paper into the first metal shielding layer at intervals of 1 meter to form a micro-shielding electric ion discharge circulating body;
the cable outer layer formed with a plurality of micro-shielding electric ion discharge circulating bodies is coated with a fourth layer of tinfoil paper, the outer layer of the fourth layer of tinfoil paper is coated with a second metal shielding layer, and the outer layer of the second metal shielding layer is coated with a leather sheath.
As a further technical solution, the method further comprises; the third layer of tin foil paper consists of a wrapping layer and an overlapped layer, the wrapping layer wraps the outside of the first metal shielding layer, and the overlapped layer consists of multiple layers of tin foil paper which are overlapped and embedded into the first metal shielding layer; the length of the overlapped layer is 10-30 cm.
According to one aspect of the specification of the invention, a dynamometer is provided, and the dynamometer is provided with the shielding cable.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention carries on the twinning pair to form the compound twisted pair after the single twisted pair wraps the first layer of tinfoil paper, wrap the second layer of tinfoil paper, the first metal shielding layer and the third layer of tinfoil paper outside the compound twisted pair once, and with the predetermined distance, embed the third layer of tinfoil paper into the first metal shielding layer, form the little shielding electric ion discharge cycle body, all high radiation, low radiation space electric ion consume on the cycle body; sequentially coating a fourth layer of tin foil paper and a second metal shielding layer outside the third layer of tin foil paper, integrally packaging and coating a leather sleeve outside to form a shielded cable; the shielding cable utilizes the tin foil paper layer to shield strong electric interference, utilizes the metal shielding layer to shield weak electric interference, consumes the strong and weak electric interference through the formed micro-shielding electric ion discharge circulating body, has better shielding effect, and is suitable for signal transmission under the severe conditions of megawatt strong magnetic field and high harmonic wave.
(2) In addition, the parts of the tin foil paper layer embedded into the metal shielding layer mutually absorb and cover between high and low frequencies, are multiply superposed, purify electromagnetic interference and greatly improve the signal transmission effect.
Drawings
Fig. 1 is a schematic diagram of a composite twisted pair according to an embodiment of the present invention.
Fig. 2 is a schematic view of a shielded cable according to an embodiment of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
According to an aspect of the present disclosure, as shown in fig. 1-2, there is provided an anti-electromagnetic interference shielding cable, including 16 single-twisted pairs, each single-twisted pair having an outer layer coated with a first layer of tinfoil paper; every two single twisted pairs are twisted in pairs to form 8 composite twisted pairs, the outer layer of each composite twisted pair is coated with a second layer of tinfoil paper, the outer layer of each second layer of tinfoil paper is coated with a first metal shielding layer, and the outer layer of each first metal shielding layer is coated with a third layer of tinfoil paper; embedding the third layer of tin foil paper into the first metal shielding layer at intervals of 1 meter to form a micro-shielding electric ion discharge circulating body; coating a fourth layer of tin foil paper on the outer layer of the cable on which a plurality of micro-shielding electric ion discharge circulating bodies are formed, coating a second metal shielding layer on the outer layer of the fourth layer of tin foil paper, and coating a leather sleeve on the outer layer of the second metal shielding layer, wherein the preset thicknesses of the first layer of tin foil paper, the second layer of tin foil paper and the fourth layer of tin foil paper are all 0.12 mm, and the preset thickness of the third layer of tin foil paper is 0.36-0.96 mm; the preset thickness of the first metal shielding layer is 15 mm; the preset thickness of the second metal shielding layer is 55 mm. In addition, the parts of the tin foil paper layer embedded into the metal shielding layer mutually absorb and cover between high and low frequencies, are multiply superposed, purify electromagnetic interference and greatly improve the signal transmission effect.
Specifically, the metal shielding layer is a densely woven phosphor copper mesh for removing low-frequency electric ions. The tin foil paper layer is tin foil paper with a preset thickness and is used for absorbing high-frequency electric ions.
Specifically, the third layer of tin foil paper comprises a wrapping layer and an overlapped layer, the wrapping layer is wrapped outside the first metal shielding layer, and the overlapped layer is formed by overlapping multiple layers of tin foil paper and is embedded into the first metal shielding layer.
As an embodiment, a method for manufacturing the anti-electromagnetic interference shielding cable includes:
step 1, determining the preset thicknesses of a first layer of tin foil paper, a second layer of tin foil paper, a third layer of tin foil paper, a first metal shielding layer and a second metal shielding layer; the preset thicknesses of the first layer of tin foil paper, the second layer of tin foil paper and the fourth layer of tin foil paper are all 0.12 mm, and the preset thickness of the third layer of tin foil paper is 0.36-0.96 mm; the preset thickness of the first metal shielding layer is 15 mm; the preset thickness of the second metal shielding layer is 55 mm.
And 2, wrapping a first layer of tin foil paper outside the 16 single-double stranded wires.
And 3, twining every two single twisted pairs into a composite twisted pair, and coating a second layer of tinfoil paper on the outer layer of the composite twisted pair.
And 4, sequentially coating a first metal shielding layer and a third layer of tin foil paper outside the second layer of tin foil paper.
Step 5, embedding the third layer of tin foil paper into the first metal shielding layer at intervals of 1 meter to form a micro-shielding electric ion discharge circulating body; the third layer of tin foil paper consists of a wrapping layer and an overlapped layer, the wrapping layer wraps the outside of the first metal shielding layer, and the overlapped layer is formed by overlapping a plurality of layers of tin foil paper and is embedded into the first metal shielding layer; the length of the overlapped layer is 10-30 cm.
And 6, coating a fourth layer of tinfoil paper on the outer layer of the cable on which the micro-shielding electric ion discharge circulating bodies are formed, coating a second metal shielding layer on the outer layer of the fourth layer of tinfoil paper, and coating a leather sleeve on the outer layer of the second metal shielding layer.
In the embodiment, a single twisted pair is wrapped by a first layer of tin foil paper and then twisted in pairs to form a composite twisted pair, a second layer of tin foil paper, a first metal shielding layer and a third layer of tin foil paper are wrapped outside the composite twisted pair at one time, the third layer of tin foil paper is embedded into the first metal shielding layer at a preset distance to form a micro-shielding electric ion discharge circulating body, and all high-radiation and low-radiation space electric ions are consumed on the circulating body; sequentially coating the fourth layer of tin foil paper and the second metal shielding layer outside the third layer of tin foil paper, integrally packaging and coating a leather sheath outside the third layer of tin foil paper to form a shielded cable; the shielding cable utilizes the tin foil paper layer to shield strong electric interference, utilizes the metal shielding layer to shield weak electric interference, consumes the strong and weak electric interference through the formed micro-shielding electric ion discharge circulating body, has better shielding effect, and is suitable for signal transmission under the severe conditions of megawatt strong magnetic field and high harmonic wave.
According to an aspect of the specification of the invention, a dynamometer is further provided, and the dynamometer is provided with the anti-electromagnetic interference shielding cable.
In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention.
Claims (6)
1. The anti-electromagnetic interference shielding cable is characterized in that the shielding cable is a 16-core twisted-pair shielding cable and comprises 16 single-twisted wires and double-twisted wires, wherein the outer layer of each single-twisted wire and double-twisted wire is coated with a first layer of tin foil paper; every two single twisted pairs are twisted in pairs to form 8 composite twisted pairs, the outer layer of each composite twisted pair is coated with a second layer of tinfoil paper, the outer layer of each second layer of tinfoil paper is coated with a first metal shielding layer, and the outer layer of each first metal shielding layer is coated with a third layer of tinfoil paper; embedding the third layer of tin foil paper into the first metal shielding layer at intervals of 1 meter to form a micro-shielding electric ion discharge circulating body; coating a fourth layer of tinfoil paper on the outer layer of the cable on which a plurality of micro-shielding electric ion discharge circulating bodies are formed, coating a second metal shielding layer on the outer layer of the fourth layer of tinfoil paper, and coating a leather sleeve on the outer layer of the second metal shielding layer; the preset thicknesses of the first layer of tin foil paper, the second layer of tin foil paper and the fourth layer of tin foil paper are all 0.12 mm, and the preset thickness of the third layer of tin foil paper is 0.36-0.96 mm; the preset thickness of the first metal shielding layer is 15 mm; the preset thickness of the second metal shielding layer is 55 mm.
2. The anti-electromagnetic interference shielded cable of claim 1, wherein the first and second metallic shielding layers are densely woven phosphor-copper mesh.
3. The anti-electromagnetic interference shielded cable of claim 1, wherein the third layer of tinfoil paper is composed of a wrapping layer and an overlapping layer, the wrapping layer is wrapped outside the first metal shielding layer, and the overlapping layer is composed of multiple layers of tinfoil paper in an overlapping manner and is embedded in the first metal shielding layer.
4. The method for manufacturing an anti-electromagnetic interference shielding cable according to claim 1, comprising:
determining the preset thicknesses of the first layer of tin foil paper, the second layer of tin foil paper, the third layer of tin foil paper, the first metal shielding layer and the second metal shielding layer;
wrapping a first layer of tin foil paper outside the 16 single-twisted pair wires;
twining every two single twisted pairs into 8 composite twisted pairs, and coating a second layer of tinfoil paper on the outer layer of each composite twisted pair;
sequentially coating a first metal shielding layer and a third layer of tin foil paper outside the second layer of tin foil paper;
embedding the third layer of tin foil paper into the first metal shielding layer at intervals of 1 meter to form a micro-shielding electric ion discharge circulating body;
the cable outer layer formed with a plurality of micro-shielding electric ion discharge circulating bodies is coated with a fourth layer of tinfoil paper, the outer layer of the fourth layer of tinfoil paper is coated with a second metal shielding layer, and the outer layer of the second metal shielding layer is coated with a leather sheath.
5. The method of making an anti-electromagnetic interference shielded cable of claim 4, further comprising; the third layer of tin foil paper consists of a wrapping layer and an overlapped layer, the wrapping layer wraps the outside of the first metal shielding layer, and the overlapped layer consists of multiple layers of tin foil paper which are overlapped and embedded into the first metal shielding layer; the length of the overlapped layer is 10-30 cm.
6. Dynamometer machine characterized in that it has a shielded cable according to any of claims 1-3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110310389.XA CN113223762B (en) | 2021-03-23 | 2021-03-23 | Anti-electromagnetic interference shielding cable and dynamometer with same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110310389.XA CN113223762B (en) | 2021-03-23 | 2021-03-23 | Anti-electromagnetic interference shielding cable and dynamometer with same |
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| CN113223762A CN113223762A (en) | 2021-08-06 |
| CN113223762B true CN113223762B (en) | 2022-05-31 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5777273A (en) * | 1996-07-26 | 1998-07-07 | Delco Electronics Corp. | High frequency power and communications cable |
| JP4041389B2 (en) * | 2002-12-12 | 2008-01-30 | 株式会社神戸製鋼所 | Superconducting connection structure and manufacturing method thereof |
| JP5566716B2 (en) * | 2010-02-05 | 2014-08-06 | 矢崎総業株式会社 | Wire harness |
| CN203951186U (en) * | 2014-07-11 | 2014-11-19 | 衢州市沃思电子技术有限公司 | The stube cable of electric power secondary system |
| CN205451852U (en) * | 2016-02-16 | 2016-08-10 | 中山市艾斯贝尔电线有限公司 | HDMI high definition digit line |
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