CN114530739A - Anti-electromagnetic interference cable and connecting method thereof, transponder system and train - Google Patents
Anti-electromagnetic interference cable and connecting method thereof, transponder system and train Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R31/00—Coupling parts supported only by co-operation with counterpart
- H01R31/06—Intermediate parts for linking two coupling parts, e.g. adapter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L15/00—Indicators provided on the vehicle or vehicle train for signalling purposes ; On-board control or communication systems
- B61L15/0018—Communication with or on the vehicle or vehicle train
- B61L15/0036—Conductor-based, e.g. using CAN-Bus, train-line or optical fibres
-
- 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
-
- 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
-
- 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
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding
- H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/26—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for engaging or disengaging the two parts of a coupling device
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R2201/00—Connectors or connections adapted for particular applications
- H01R2201/02—Connectors or connections adapted for particular applications for antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R2201/00—Connectors or connections adapted for particular applications
- H01R2201/26—Connectors or connections adapted for particular applications for vehicles
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
Abstract
The invention discloses an anti-electromagnetic interference cable, a connection method thereof, a transponder system and a train, wherein the cable disconnects a first signal transmission cable which is used for transmitting signals between a transponder communication unit and a transponder antenna in the cable from a train body, so that the first signal transmission cable isolates interference signals transmitted by the train body; specifically, the method includes insulating an interface connected to the first signal transmission cable in the connector from the connector body so as to prevent an interference signal from the vehicle body from entering the first signal transmission cable via the connector. The anti-electromagnetic interference cable can prevent interference signals on the carriage or the cabinet from being coupled into the cable, thereby effectively reducing the interference condition of the cable in the using process, ensuring the stability and the safety of the signal transmission process of the transponder system, and improving the signal transmission safety of the train control system.
Description
Technical Field
The invention belongs to the technical field of train signal cables, and particularly relates to an anti-electromagnetic interference cable, a connection method thereof, a transponder system and a train.
Background
The transponder communication unit BTM and the transponder antenna (CAU) are part of the train control vehicle-mounted device, which are installed inside the train and at the bottom outside the train, respectively, and connected by a cable. During the operation of the train, the BTM needs to perform wireless communication with the ground transponder: when the train passes above the ground transponder, the 27MHz electromagnetic energy transmitted by the vehicle-mounted BTM antenna activates the transponder, the transponder starts working and transmits message information, and the CAU receives the message and then transmits the message to the BTM through the cable.
With the rapid development of high-speed railways in China, the electromagnetic environment becomes increasingly complex, and the influence of electromagnetic interference on a train BTM system is increasingly large. The cable is used as an important component of the BTM system, is connected with the CAU and the host for signal transmission, and the safety operation of the train is influenced by the electromagnetic compatibility of the cable.
Taking a D cable as an example, the existing D cable is connected to the vehicle ATP cabinet through a ground wire, and the cabinet is connected to the ground through a vehicle body. As shown in fig. 1, which is a schematic view of an internal connection structure of a conventional grounded D cable, the D cable has 4 core wires, a shielding layer is disposed outside each core wire, a C interface of an 8-core circular CT63-1208 connector at one end of the D cable is grounded for connecting a train body of a train to ensure grounding of the connector, and the shielding layers outside the 4 core wires are connected with the C interface to achieve grounding of the D cable; however, in many practical cases, it has been found that a cable connection to the vehicle body can introduce interference on the vehicle body into the cable, thereby causing the transponder system to malfunction. For example, when a train is discharged off-line through a neutral section pantograph, an interference signal is coupled to a train body through conduction, and a ground wire of the D cable is connected with the train body, so that the interference signal can be introduced into the D cable, and the normal signal transmission of the D cable is influenced.
Disclosure of Invention
In view of the above problems, the present invention provides an anti-electromagnetic interference cable, a connection method thereof, a transponder system, and a train, which can prevent the cable from receiving an interference signal from a train body.
The invention discloses an anti-electromagnetic interference cable, which comprises:
the first signal transmission cable comprises a first core wire and a first shielding layer sleeved outside the first core wire, wherein the first shielding layer is insulated from the first core wire;
the two connectors are respectively connected to two ends of the first signal transmission cable and are respectively used for connecting a transponder communication unit positioned in a train and a transponder antenna positioned outside the train and transmitting signals between the transponder communication unit and the transponder antenna;
wherein each of the connectors includes a first cable interface and a second cable interface; the first cable interface and the second cable interface are insulated; the first core wire is communicated with a first cable interface in the connector, and the first shielding layer is communicated with a second cable interface in the connector.
Further, the first signal transmission cable further comprises a first insulating layer and a first protective layer, the first insulating layer is arranged between the first core wire and the first shielding layer, and the first insulating layer is made of non-polar resin;
the first protective layer is sleeved outside the first shielding layer, and the first protective layer is made of a halogen-free flame-retardant elastic material.
Furthermore, the anti-electromagnetic interference cable further comprises a second protective layer and a third protective layer, wherein the second protective layer and the third protective layer are sequentially sleeved outside the first signal transmission cable and used for protecting the first signal transmission cable.
Furthermore, the second protective layer is made of a low-smoke halogen-free flame-retardant material; the third protective layer is made of halogen-free flame-retardant elastic material.
Furthermore, the anti-electromagnetic interference cable further comprises a second signal transmission cable, and the second signal transmission cable is arranged side by side with the first signal transmission cable;
the second signal transmission cable comprises a second core wire, a second insulating layer, a second shielding layer and a fourth protective layer; the second insulating layer, the second shielding layer and the fourth protective layer are sequentially sleeved outside the second core wire; the second shielding layer is insulated from the second core wire.
Furthermore, the second core wire is made of a silver-plated copper wire;
the second shielding layer is formed by weaving a copper foil and a tinned copper wire, or comprises an outer layer formed by weaving a copper foil and a tinned copper wire and an inner layer formed by an aluminum foil or PET material.
Further, the first core wire is made of a copper stranded wire and is used for transmitting power waves of 27.095 MHz;
the first shielding layer is formed by weaving a copper foil and a tinned copper wire, or comprises an outer layer formed by weaving a copper foil and a tinned copper wire and an inner layer formed by an aluminum foil or PET material.
Further, the electromagnetic interference resisting cable is a D cable.
The invention also discloses a connection method of the anti-electromagnetic interference cable, which comprises the following steps:
connecting two ends of the anti-electromagnetic interference cable to a transponder communication unit positioned in a train and a transponder antenna positioned outside the train respectively, and enabling the first signal transmission cable to transmit signals between the transponder communication unit and the transponder antenna;
disconnecting a first signal transmission cable of the anti-electromagnetic interference cable from a body of the train.
The invention also discloses a transponder system, which comprises a transponder communication unit, a transponder antenna and a cable, wherein the cable is the anti-electromagnetic interference cable.
The invention also discloses a train, which comprises a transponder system, wherein the transponder system is the transponder system provided by the invention.
The anti-electromagnetic interference cable is characterized in that a first signal transmission cable which is used for connecting a transponder communication unit positioned in a train and a transponder antenna positioned outside the train and transmitting signals in the cable is connected with a train body in an insulating way, so that the first signal transmission cable isolates interference signals transmitted by the train body; specifically, the method includes insulating an interface connected to the first signal transmission cable in the connector from the connector body so as to prevent an interference signal from the vehicle body from entering the first signal transmission cable via the connector. The anti-electromagnetic interference cable can prevent interference signals on the carriage or the cabinet from being coupled into the cable, thereby effectively reducing the interference condition of the cable in the using process, ensuring the stability and the safety of the signal transmission process of the transponder system, and improving the signal transmission safety of the train control system. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 shows a schematic view of a cable internal connection according to the prior art;
FIG. 2 is a schematic diagram illustrating the connection relationship between the inner cables according to a first embodiment of the present invention;
fig. 3 shows a schematic cross-sectional structure of a cable according to a first embodiment of the invention;
FIG. 4 is a schematic diagram showing the connection relationship between the inside of the cable according to the second embodiment of the present invention;
FIG. 5 is a schematic cross-sectional structure of a cable according to a second embodiment of the present invention;
FIG. 6 illustrates a transponder system according to an embodiment of the present invention;
fig. 7 is a schematic cross-sectional structure diagram of a double-shielded cable according to an embodiment of the invention.
The main reference numbers in the figures illustrate:
1. a first signal transmission cable; 2. a connector; 3. a second signal transmission cable; 4. a second protective layer; 5. a third protective layer; 11. a first core wire; 12. a first shielding layer; 13. a first insulating layer; 14. a first protective layer; 31. a second core wire; 32. a second shielding layer; 33. a second insulating layer; 34. and a fourth protective layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In consideration of the problems that in the running of a train, the internal structure of a D cable in the existing transponder system is connected (conducted) with a train body, so that an interference signal can be introduced into the D cable to influence the normal signal transmission of the D cable, cause the failure of the transponder system and influence the safe running of the train; for example, when a train is discharged off-line through a phase section pantograph, interference signals are coupled to the car body by conduction and then introduced into the D-cable through the car body to cause a failure of the transponder system. The invention provides an anti-electromagnetic interference cable, a transponder system and a train.
Taking the application of the D cable as an example, the D cable mentioned in the application is a D interface cable, and is a special cable which is applied to the field of railway communication, in particular to a special cable which is arranged in a train body and is used for transmitting high-frequency communication signals between a transponder antenna and a BTM host. Where D represents the communication line between the transponder antenna and the BTM host. It should be understood that, as a practical matter, a person skilled in the art may also use the anti-electromagnetic interference cable of the present invention as another connection cable that needs to isolate the vehicle body interference signal, and the D cable in the embodiment of the present application is only an example of one application of the anti-electromagnetic interference cable of the present invention.
The first embodiment is as follows:
for the understanding of the present embodiment, a detailed description will be given first of all of the electromagnetic interference resisting cables disclosed in the embodiments of the present application. As shown in fig. 2, a schematic structural diagram of an anti-electromagnetic interference cable provided in an embodiment of the present invention includes:
the first signal transmission cable 1 comprises a first core wire 11 and a first shielding layer 12 sleeved outside the first core wire 11, wherein the first shielding layer 12 is insulated from the first core wire 11;
two connectors 2 are respectively connected to two ends of the first signal transmission cable 1, and each connector 2 comprises a shell, and a first cable interface and a second cable interface which are positioned in the shell; the first cable interface, the second cable interface and the shell are insulated; the first core wire 11 is communicated with a first cable interface in the connector 2, and the first shielding layer 12 is communicated with a second cable interface in the connector 2;
the two specific connectors 2 are used for connecting a transponder communication unit located inside the train and a transponder antenna located outside the train, respectively, and the first signal transmission cable 1 is used for transmitting signals between the transponder communication unit and the transponder antenna.
In the embodiment of this application, intercommunication transponder communication unit and transponder antenna are connected respectively to two connectors 2, the outer casing of transponder antenna is metal casing, this metal casing and train automobile body fixed connection, the transponder antenna that is located this metal casing inside disconnects with the train automobile body, when connector 2's casing and transponder antenna were connected, contact between connector 2's casing and the outer metal casing of transponder antenna switches on, but because insulating between first cable interface and the second cable interface in connector 2, first cable interface, also insulating between second cable interface and connector 2's the casing, and then can ensure that inside first signal transmission cable 1 of cable only communicates transponder communication unit and transponder antenna, it gets into first signal transmission cable 1 to have stopped automobile body interference signal.
Fig. 3 is a schematic cross-sectional view of an anti-electromagnetic interference cable according to an embodiment of the present invention, in particular, a single-wire type anti-electromagnetic interference cable, as shown in fig. 3, in which the first signal transmission cable 1 includes a first insulating layer 13 and a first protective layer 14, the first insulating layer 13 is disposed between the first core 11 and the first shielding layer 12, and the first insulating layer 13 is made of a non-polar resin;
the first protective layer 14 is sleeved outside the first shielding layer 12, and the material of the first protective layer 14 is a halogen-free flame retardant elastic material.
In the embodiment of the present application, the anti-electromagnetic interference cable further includes a second protective layer 4 and a third protective layer 5, and the second protective layer 4 and the third protective layer 5 are sequentially sleeved outside the first signal transmission cable 1 for protecting the first signal transmission cable 1. Wherein, the second protective layer 4 is made of low-smoke halogen-free flame-retardant material; the third protective layer 5 is made of halogen-free flame-retardant elastic material.
The first core wire 11 is made of a copper stranded wire and is formed by stranding a plurality of strands of copper wires and is used for transmitting power waves of 27.095 MHz; the first shielding layer 12 is formed by weaving copper foil and tinned copper wire.
Optionally, the first shielding layer 12 has a double-layer structure, and a layer of aluminum foil is further disposed on the inner side of the outer layer formed by weaving the copper foil and the tinned copper wire, and the aluminum foil is wrapped outside the first insulating layer 13.
Referring to fig. 2, according to the first embodiment of the present application, the connector 2 is an 8-core circular CT63-1208 connector, and 8 internal interfaces of the CT63-1208 connector are isolated from the housings of the CT63-1208 connectors, so as to prevent the cables from being conducted to the train body through the interfaces and the connector housings.
In the present embodiment, the wiring relationship between the CT63-1208 connectors and the first signal transmission cable 1 of the cable is as follows:
referring to the above table, the CT63-1208 connectors at the upper end of the vehicle refer to the connectors arranged between the cable of the present invention and the vehicle-mounted transponder communication unit BTM, the CT63-1208 connectors at the lower end of the vehicle refer to the connectors arranged between the cable of the present invention and the transponder antenna CAU, and the first core wire 11 is the thick wire TX in the above table, and is used for the communication operation between the transponder communication unit BTM and the transponder antenna CAU, and transmits the power wave of 27.095 MHz.
As shown in fig. 2, in this embodiment, the C interface is not connected to a ground line, corresponds to the upper table, and is empty, and at this time, any two interfaces isolated from each other in the connector may be selected as the first cable interface and the second cable interface. As shown in the above table, the hole site number a is the first cable interface connected with the first core wire 11, the hole site number G is the second cable interface connected with the first shielding layer 12, and other hole site numbers in the CT63-1208 connectors are all set to be empty and are all insulated from the train body, by canceling the design that the first shielding layer 12 in the first signal transmission cable 1 is connected with the train body through the connector housing, the interference signal on the carriage or the cabinet is prevented from being coupled into the cable, thereby effectively reducing the signal interference condition of the cable in the use process due to the transmission of the train body, further improving the interference resistance of the cable, and simultaneously ensuring the safe operation of the transponder system.
It should be understood that the CT63-1208 connectors are only a selection of one type of connector 2, and that other connectors may be selected that meet the requirements of the present application: the connector 2 comprises a first cable interface and a second cable interface which are insulated from each other, and the first cable interface and the second cable interface are not communicated with the vehicle body.
In contrast to the prior art shown in fig. 1, the C interface of the CT63-1208 connector is connected to ground to achieve grounding. The cable in the embodiment adopts the following three key ways to improve the anti-electromagnetic interference effect of the cable: a. the connection of a C interface in the connector 2 with a ground wire in the prior art is eliminated; b. the use of all interfaces except A, G (i.e. the first cable interface and the second cable interface) is eliminated, and only the connector interface for realizing the signal transmission function between the transponder communication unit and the transponder antenna is reserved; c. the conductivity between the shell of the connector 2 and the cable inner shielding layer is cancelled. Found through the actual measurement, when making the connector interface all with automobile body disconnection, improved the anti-electromagnetic interference ability of cable greatly. Exemplarily, the wiring mode inside the D cable can be modified on the basis of the conventional D cable, so that the noise immunity of the D cable is improved, interference signals on a carriage or a cabinet are prevented from being coupled into the D cable, and the interference condition of the D cable in the using process is effectively reduced.
In one embodiment of the present application, the main performance indicators of the single-wire type anti-electromagnetic interference D cable include: the D cable can complete the transmission of an uplink 4.23MHz signal and the transmission of a downlink 27.095MHz signal; the D cable port is adapted to an autonomous CAU antenna D interface; the cable D is not provided with a grounding point (namely is isolated from the vehicle body); the insulation resistance of the D cable is more than or equal to 500 MOmega (under the condition of 500 VDC); the withstand voltage of the D cable is more than or equal to 1000 VAC; d, the salt spray tolerance of the cable needs to reach more than 96 hours; the low-smoke halogen-free index of the D cable meets the standards GB/T17651.2 and GB/T176502, and the flame-retardant index meets the standard GB/T18380.31; the impact requirement meets class 1B in IEC 61373; the vibration requirement meets class 1B in IEC 61373.
Example two:
with reference to the first embodiment, the anti-electromagnetic interference cable in the second embodiment of the present application further includes a second signal transmission cable 3, where the second signal transmission cable 3 is disposed side by side with the first signal transmission cable 1;
fig. 4 is a schematic diagram of the internal connection relationship of a cable according to a second embodiment of the present invention, and fig. 5 is a schematic diagram of a cross-sectional structure of a cable according to a second embodiment of the present invention, specifically, a four-line type electromagnetic interference resistant cable, as shown in fig. 4 and fig. 5, including a first signal transmission cable 1 and three second signal transmission cables 3;
the second signal transmission cable includes a second core wire 31, a second insulation layer 33, a second shield layer 32, and a fourth protective layer 34; the second insulating layer 33, the second shielding layer 32 and the fourth protective layer 34 are sequentially sleeved outside the second core wire 31; the second shield layer 32 is insulated from the second core wire 31.
In the embodiment of the present application, the first core wire 11 is made of a copper stranded wire, and is used for transmitting power waves of 27.095 MHz; the first shielding layer 12 is formed by weaving a copper foil and a tinned copper wire, or the first shielding layer 12 is of a double-layer structure, the outer layer is formed by weaving a copper foil and a tinned copper wire, the inner layer is a layer of aluminum foil or a layer of PET (polyethylene terephthalate) material wrapped outside the first insulating layer 13, and the inner layer has excellent physical and mechanical properties in a wide temperature range, the long-term use temperature can reach 120 ℃, the electric insulation property is excellent, and even under high-temperature and high-frequency conditions, the electric property of the electric conduction type shielding layer is still good, but the corona resistance is poor, the creep resistance, the fatigue resistance, the friction resistance and the size stability are good. The second core wire 31 is made of silver-plated copper wire; the second insulating layer 33 is made of a non-polar resin material, the second shielding layer 32 is formed by weaving a copper foil and a tinned copper wire, or the second shielding layer 32 is of a double-layer structure, the outer layer is formed by weaving a copper foil and a tinned copper wire, and the inner layer is a layer of aluminum foil or a layer of PET material wrapped outside the second insulating layer 33; the fourth protective layer 34 is a halogen-free flame retardant elastomer.
Referring to fig. 5, in this embodiment, the second protection layer 4 is coated outside the first protection layer 14 and the fourth protection layer 34, the second protection layer 4 is specifically a low-smoke halogen-free flame retardant filler filled in the third protection layer 5, the third protection layer 5 is a halogen-free flame retardant elastomer, and the second protection layer 4 and the third protection layer 5 jointly play a role in protecting the first signal transmission cable 1 and the second signal transmission cable 3 inside.
Referring to fig. 4, according to the second embodiment of the present application, there are A, B, C, D, E, F, G, H8 interfaces in the connector 2, where G, H conduction, B, C, D conduction, E, F conduction and A, B, E, G are isolated from each other. Four signal transmission cables are arranged in the cable, except a first cable interface A and a second cable interface G which are connected with the first signal transmission cable 1, the other six interfaces are reserved interface positions of the second signal transmission cable. In fig. 4, the first signal transmission cable 1 is connected to the connector 2, and three second signal transmission cables 3 are vacant and do not communicate with the connector 2.
As can be seen by comparing with fig. 1 and 4, in this embodiment, on the basis of the conventional cable, all the core and shielding layer interfaces except the thick line (the first core 11 transmitting 27.095MHz power wave) and the first shielding layer 12 are provided (the second signal transmission cable 3 in the four-line type emi-resistant cable in fig. 1 is not connected to the connector 2, and only 27.095MHz power is transmitted through the first signal transmission cable 1); the connection mode of the core wires in the cable is simplified, so that the thick wires which bear the communication task keep the communication function, and the normal work of the cable is not influenced.
The second signal transmission cable 3 in the four-wire type emi cable in fig. 1 is also connected to the connector 2, and the connector 2 is grounded through the C interface, so that the grounded first signal transmission cable 1 is grounded. In fig. 4, only the first signal transmission cable 1 in the cable is connected with the connector 2, the connector 2 is not conducted with the first signal transmission cable 1, and the cable is not conducted with the vehicle body, so that the cable has better electromagnetic interference resistance on the premise of ensuring the communication transmission function.
As shown in fig. 5, the first signal transmission cable 1 is thicker than the second signal transmission cable 3, and in practice, the first protective layer 14 of the first signal transmission cable and the fourth protective layer 34 of each second signal transmission cable can be distinguished by setting different colors, and the interfaces in the connector 2 are identified correspondingly. Convenient installation and fault maintenance.
The four-wire type anti-electromagnetic interference cable in the embodiment can be used as a D cable.
It should be understood that only one shielding layer is provided in the internal structure of the cables in the first and second embodiments, and those skilled in the art may provide a double shielding layer or multiple shielding layers according to actual requirements, for example, a shielding layer may be further provided between the second protective layer 4 and the third protective layer 5, as shown in fig. 7, which is a schematic cross-sectional structure diagram of a four-core double shielding layer cable according to an embodiment of the present invention, and a sheath and an outer shielding layer are further provided between the second protective layer 4 and the third protective layer 5, and the outer shielding layer is also formed by weaving copper foils and tinned copper wires, and the weaving density is greater than 80%.
Example three:
the invention also discloses a connecting method of the cable, the cable is the anti-electromagnetic interference cable, and the method comprises the following steps:
connecting two ends of a cable to a transponder communication unit located inside a train and a transponder antenna located outside the train, respectively, and enabling a first signal transmission cable 1 to transmit signals between the transponder communication unit and the transponder antenna;
insulating a first signal transmission cable 1 in a cable from a train body; specifically, the first cable interfaces of the two connectors 2 are insulated from the train body; the second cable interfaces of the two connectors 2 are insulated from the train body, so that both ends of the first signal transmission cable 1 are respectively only connected with the transponder communication unit and the transponder antenna.
The cable in this embodiment is the anti-electromagnetic interference cable described in the first embodiment or the second embodiment.
By the method, the cable for communication between the transponder antenna and the transponder communication unit is isolated from the train body, so that interference signals are prevented from being transmitted into the transponder system through the train body.
The installation method of the anti-electromagnetic interference cable comprises the following steps:
firstly, a first core wire 11 of a first signal transmission cable 1 is communicated with a first cable interface in a connector 2, and a first shielding layer 12 of the first signal transmission cable 1 is communicated with a second cable interface in the connector 2; wherein the first core 11 is insulated from the first shielding layer 12; the first cable port, the second cable port and the housing of the connector 2 are insulated from each other.
After the first signal transmission cable 1 passes through the vehicle body, the connectors 2 at both ends are connected to the transponder communication unit and the transponder antenna, respectively.
Example four:
based on the same technical concept, an embodiment of the present application further provides a transponder system, and fig. 6 shows the transponder system according to the embodiment of the present invention, which includes a transponder communication unit, a transponder antenna, and a cable, where the cable is an anti-electromagnetic interference cable according to the first embodiment or the second embodiment of the present invention. Since the anti-electromagnetic interference cable is adopted in the scheme, specific principles can refer to the description of the first embodiment and the second embodiment, and are not described herein again.
Example five:
based on the same technical concept, the embodiment of the present application further provides a train, which includes a transponder system, and the transponder system is the transponder system described in the fourth embodiment of the present invention. Since the transponder system is adopted in the present embodiment, specific principles may refer to the descriptions of the first embodiment, the second embodiment, and the fourth embodiment, and are not described herein again.
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 technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1. An anti-electromagnetic interference cable, comprising:
the first signal transmission cable (1) comprises a first core wire (11) and a first shielding layer (12) sleeved outside the first core wire (11), wherein the first shielding layer (12) is insulated from the first core wire (11);
the two connectors (2) are respectively connected to two ends of the first signal transmission cable (1), and the two connectors (2) are respectively used for connecting a transponder communication unit positioned in a train and a transponder antenna positioned outside the train and transmitting signals between the transponder communication unit and the transponder antenna;
wherein each of the connectors (2) comprises a first cable interface and a second cable interface; the first cable interface and the second cable interface are insulated; the first core wire (11) is communicated with a first cable interface in the connector (2), and the first shielding layer (12) is communicated with a second cable interface in the connector (2).
2. The anti-electromagnetic interference cable according to claim 1, wherein the first signal transmission cable (1) further comprises a first insulating layer (13) and a first protective layer (14), the first insulating layer (13) is disposed between the first core wire (11) and the first shielding layer (12), and the material of the first insulating layer (13) is a non-polar resin;
the first protective layer (14) is sleeved outside the first shielding layer (12), and the first protective layer (14) is made of a halogen-free flame-retardant elastic material.
3. The anti-electromagnetic interference cable according to claim 1, further comprising a second protective layer (4) and a third protective layer (5), wherein the second protective layer (4) and the third protective layer (5) are sequentially sleeved outside the first signal transmission cable (1) for protecting the first signal transmission cable (1).
4. The anti-electromagnetic interference cable according to claim 3, wherein the second protective layer (4) is made of a low-smoke halogen-free flame-retardant material; the third protective layer (5) is made of halogen-free flame-retardant elastic material.
5. The anti-electromagnetic interference cable according to claim 3, characterized in that it further comprises a second signal transmission cable (3), said second signal transmission cable (3) being arranged side by side with said first signal transmission cable (1);
the second signal transmission cable comprises a second core wire (31), a second insulation layer (33), a second shield layer (32), and a fourth protective layer (34); the second insulating layer (33), the second shielding layer (32) and the fourth protective layer (34) are sequentially sleeved outside the second core wire (31); the second shielding layer (32) is insulated from the second core wire (31).
6. The anti-electromagnetic interference cable according to claim 5, wherein the second core wire (31) is made of silver-plated copper wire;
the second shielding layer (32) is formed by weaving copper foils and tinned copper wires, or the second shielding layer (32) comprises an outer layer formed by weaving copper foils and tinned copper wires and an inner layer formed by aluminum foils or PET materials.
7. The anti-electromagnetic interference cable according to any one of claims 1 to 6, wherein the first core wire (11) is made of copper stranded wire and is used for transmitting 27.095MHz power wave;
the first shielding layer (12) is formed by weaving a copper foil and a tinned copper wire, or the first shielding layer (12) comprises an outer layer formed by weaving a copper foil and a tinned copper wire and an inner layer formed by an aluminum foil or PET material.
8. The EMI resistant cable of claim 7 wherein said EMI resistant cable is a D cable.
9. A method for connecting the anti-electromagnetic interference cable according to any one of claims 1 to 8,
connecting two ends of the anti-electromagnetic interference cable with a transponder communication unit positioned in a train and a transponder antenna positioned outside the train respectively, and enabling the first signal transmission cable (1) to transmit signals between the transponder communication unit and the transponder antenna;
disconnecting a first signal transmission cable (1) in the anti-electromagnetic interference cable from a body of the train.
10. A transponder system comprising a transponder communication unit, a transponder antenna and a cable, wherein the cable is an anti-electromagnetic interference cable according to any one of claims 1 to 8.
11. A train comprising a transponder system, wherein the transponder system is as claimed in claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210063680.6A CN114530739B (en) | 2022-01-20 | 2022-01-20 | Anti-electromagnetic interference cable and connection method thereof, transponder system and train |
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| CN202210063680.6A CN114530739B (en) | 2022-01-20 | 2022-01-20 | Anti-electromagnetic interference cable and connection method thereof, transponder system and train |
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| CN114530739B CN114530739B (en) | 2024-03-22 |
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| CN114530739B (en) | 2024-03-22 |
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