CN210378523U

CN210378523U - Railway signal cable

Info

Publication number: CN210378523U
Application number: CN201921551983.2U
Authority: CN
Inventors: 桑田; 杨宝根; 张俊凯; 郑清忠; 闫春子; 王国强; 王文同
Original assignee: Tianshui Railway Cable Co Ltd
Current assignee: Tianshui Railway Cable Co Ltd
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2020-04-21
Anticipated expiration: 2029-09-18

Abstract

The utility model relates to a railway signal cable with alarming function wets. It includes the cable sheath, the cladding in cable core in the cable sheath, its characterized in that: the cable is characterized by further comprising an alarm device, wherein a damp alarm wire pair is arranged in the cable sheath and formed by twisting two alarm wires, each alarm wire comprises an N-type polyethylene foam plastic sheath and a conductor wire core coated in the N-type polyethylene foam plastic sheath, and the conductor wire cores of the two alarm wires are connected through the alarm device. The utility model discloses an alarm wire of two mutual transposition is insulating in utilizing N type polyethylene foam sheath drying environment as the sensing element that wets, electrically conductive characteristic in the humid environment, and whether the inside moisture of detection signal cable, and can technical alarm, realize the automatic detection alarming function that wets in the signal cable, need not artifical the detection, guaranteed that signal cable's operation is stable and safe.

Description

Railway signal cable

Technical Field

The utility model relates to a railway signal cable, concretely relates to signal cable with alarming function wets.

Background

The signal cable is mainly used as a transmission medium of train control signals, the running safety of a train cannot be directly influenced due to good quality, when the two ends of the signal cable are poorly sealed or any point in the middle of the cable is damaged, moisture can enter the inside of the cable, the insulation resistance of the signal cable is gradually reduced, and the misoperation of signal equipment can be caused after a long time. At present, signal cables used in China do not have alarm devices, all the signal cables are tested and searched by line maintenance personnel at regular intervals, the method needs to disconnect the joint boxes at the two ends of the cables for testing, and is troublesome, so that the test is usually performed at regular intervals, the hysteresis is realized, and moisture is difficult to find in time after entering the cable.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a railway signal cable to the problem that prior art exists.

The utility model discloses a concrete technical scheme as follows:

the utility model provides a railway signal cable, includes the cable sheath, cladding in cable core in the cable sheath, its characterized in that: the cable is characterized by further comprising an alarm device, wherein a damp alarm wire pair is arranged in the cable sheath and formed by twisting two alarm wires, each alarm wire comprises an N-type polyethylene foam plastic sheath and a conductor wire core coated in the N-type polyethylene foam plastic sheath, and the conductor wire cores of the two alarm wires are connected through the alarm device;

furthermore, the N-type polyethylene foam plastic sheath is prepared by a chemical foaming method, and the adopted foaming agent is N-dimethyl N or N-dinitrosoterephthalamide;

further, the foaming degree of the N-type polyethylene foam plastic sheath is 65%;

further, the thickness of the pipe wall of the N-type polyethylene foam plastic sheath is 0.3mm-0.4 mm;

furthermore, the conductor wire core is a copper conductor, and the diameter of the conductor wire core is 0.5mm-1.0 mm;

furthermore, the alarm device is formed by connecting an alarm and a power supply;

furthermore, the cable sheath comprises a cable core wrapping belt, a moisture-proof shielding layer, an inner sheath, a galvanized steel strip and a DWZR outer sheath which are sequentially arranged from inside to outside.

The utility model discloses following beneficial effect has:

the utility model discloses an alarm wire of two mutual transposition is insulating in utilizing N type polyethylene foam sheath drying environment as the sensing element that wets, electrically conductive characteristic in the humid environment, and whether the inside moisture of detection signal cable, and can in time report to the police, realize the automatic detection alarming function that wets in the signal cable, need not artifical the detection, guaranteed that signal cable's operation is stable and safe.

Drawings

Fig. 1 is a cross-sectional view of a signal cable of the present invention;

fig. 2 is a cross-sectional view of the alarm wire of the present invention;

fig. 3 is a schematic view of the connection between the alarm wire and the alarm device of the present invention.

Detailed Description

The railway signal cable shown in fig. 1 to 3 comprises a cable sheath 1, cable cores 2 coated in the cable sheath 1 and an alarm device 3, wherein a damp alarm line pair 4 is arranged in the cable sheath 1, the damp alarm line pair 4 is formed by twisting two alarm wires 4-1, each alarm wire 4-1 comprises an N-type polyethylene foam plastic sheath 4-2 and a conductor core 4-3 coated in the N-type polyethylene foam plastic sheath 4-2, and the conductor cores 4-3 of the two alarm wires 4-1 are connected through the alarm device 3. The alarm device 3 is formed by connecting an alarm 3-1 and a power supply 3-2; the cable sheath 1 comprises a cable core belting 1-1, a moisture-proof shielding layer 1-2, an inner sheath 1-3, a galvanized steel strip 1-4 and a DWZR outer sheath 1-5 which are sequentially arranged from inside to outside.

The utility model discloses a concrete working process as follows:

the utility model discloses an adopt N type polyethylene foam plastic sheath 4-2 to give first place to with polyethylene resin, add N-dimethyl N or N-dinitroso p-phenylene terephthalamide foamer, the heating foaming makes, N type polyethylene foam plastic sheath 4-2 has the foaming degree height, the cell is big, the insulating dielectric constant is little after the foaming, communicate each other between the cell, the easy moisture absorption's characteristics, adopt N type polyethylene foam plastic sheath 4-2 as the insulating sheath of alarm wire 4-1, two alarm wires 4-1 are under the dry condition, its resistance reaches 3000 MOmega km; when water enters the cable sheath 1 and is affected with damp, water can penetrate through the pores on the N-type polyethylene foam plastic sheath 4-2 and enter the conductor wire cores 4-3, at the moment, the insulation resistance between the two alarm wires 4-1 is rapidly reduced to zero, the two conductor wire cores 4-3 are communicated, the power supply 3-2 supplies power to enable the alarm 3-1 to alarm, and workers are informed that the interior of the cable is affected with damp.

The foaming degree of the N-type polyethylene foam plastic sheath 4-2 of the utility model is 65%, if the foaming degree is too low, mutually communicated blast holes are not easy to generate, moisture is not easy to pass through, and if the foaming degree is too high, the sheath strength is too low and is easy to damage; the thickness of the pipe wall of the N-type polyethylene foam plastic sheath 4-2 is 0.3mm-0.4mm, so that the sheath can have good insulating property in a dry state; the conductor wire core 4-3 is a copper conductor, the diameter of the conductor wire core 4-3 is 0.5mm-1.0mm, and the conductor wire core 4-3 is ensured to have good conductivity; the cable sheath 1 adopts the structure of the cable core wrapping belt 1-1, the moisture-proof shielding layer 1-2, the inner sheath 1-3, the galvanized steel strip 1-4 and the DWZR outer sheath 1-5, so that the cable sheath 1 has good strength, toughness, moisture resistance and flame retardance.

Claims

1. The utility model provides a railway signal cable, includes cable sheath (1), cladding in cable core (2) in cable sheath (1), its characterized in that: the cable is characterized by further comprising an alarm device (3), wherein a damp alarm line pair (4) is arranged in the cable sheath (1), the damp alarm line pair (4) is formed by twisting two alarm wires (4-1), each alarm wire (4-1) comprises an N-type polyethylene foam plastic sheath (4-2) and a conductor wire core (4-3) coated in the N-type polyethylene foam plastic sheath (4-2), and the conductor wire cores (4-3) of the two alarm wires (4-1) are connected through the alarm device (3).

2. A railway signal cable as claimed in claim 1, wherein: the thickness of the pipe wall of the N-type polyethylene foam plastic sheath (4-2) is 0.3mm-0.4 mm.

3. A railway signal cable as claimed in claim 1, wherein: the conductor wire core (4-3) is a copper conductor, and the diameter of the conductor wire core (4-3) is 0.5mm-1.0 mm.

4. A railway signal cable as claimed in claim 1, wherein: the alarm device (3) is formed by connecting an alarm (3-1) and a power supply (3-2).

5. A railway signal cable as claimed in claim 1, wherein: the cable sheath (1) comprises a cable core wrapping tape (1-1), a moisture-proof shielding layer (1-2), an inner sheath (1-3), a galvanized steel strip (1-4) and a DWZR outer sheath (1-5) which are sequentially arranged from inside to outside.