Mine leakage Cable
Also called mine double sheath leakage Coaxial cable , Yes MS LYFYVZ-75-9 leaky cable and MSLYFYVZ-50-9 leaky cable have dual functions of signal transmission line and antenna.
Mining leaky cable
Mining leaky cable There are two types of MSLYFYVZ-75-9 leaky cable_MSLYFYVZ-50-9 leaky cable.
MSLYFYVZ is double sheathed and MSLYFVZ is single sheathed.
Mining leaky cable has dual functions of signal transmission line and antenna.
It is used as transmission line of communication system for mines, subways, tunnels and underground facilities in the special environment where radio waves cannot be directly transmitted and spread poorly inside buildings.
Laying method of mine leakage cable
In the roadway where conditions permit, the leakage cable shall be hung at the center of the roadway top and 200mm away from the roof. The leaky cable shall be hung under the iron wire hook with a diameter of not less than 4mm, 100mm away from the hook. The hook shall be fixed on the roadway roof with a spacing of 5-10M. The hanging wire of the hanging cable must be insulated from the hook.
Cables that can be hung on the roadway wall can also be laid Bracket Upper, fixed with a sheath insulated single strand plastic tie wire, and the spacing between supports is 5-10M.
The distance between the leaky cable and the high-voltage line above 1000V shall not be less than 200mm, and the distance between the leaky cable and other cables shall not be less than 100mm. Any bare metal wire, Metal mesh Do not touch the cable and relay amplifier.
Leakage cables must be laid outward from the base station, and reverse laying is not allowed.
When laying the leaky cable, the large coil is mounted on the locomotive. As the cable is laid and rotated, try to pull it manually, and pay attention to the tension to prevent the cable from being subjected to large impact and tension.
The end of the leaky cable shall ensure the open circuit state between the inner conductor and the outer conductor, that is, the outer conductor shall be shortened by 20mm, and a special cable junction box shall be installed for terminal treatment.
The installation of relay amplifier shall be carried out during commissioning, and both ends of the relay amplifier shall be hung up to ensure that the cables at both ends of the relay are free from tension.
During cable laying, an adjustment sag shall be reserved every 50m, with diameter of 0.4m and arc length of 0.5
When the roadway turns, the cables shall be specially fixed, with the spacing less than 1.5m, and the smaller bending radius of the leaky cable is 0.2m.
To ensure the communication quality, it is recommended to install a KLT9 two-way relay amplifier every 500 meters
| Model and specification | Product name |
| MSLYFYVZ-75-9 | Leakage coaxial cable for coal mine (matching impedance 75 Ω) |
| MSLYFYVZ-50-9 | Leakage coaxial cable for coal mine (matching impedance 50 Ω) |
- Use frequency: below 1GHz
- Operating ambient temperature: - 25 ℃~70 ℃
- Laying temperature: not less than 0 ℃
- This product has the characteristics of low attenuation, low standing wave ratio, good water tightness, air tightness, flame retardancy, etc.
Technical indexes of MSLYFYVZ mining leaky cable Product model, structural data and performance parameters
| Structural data | Company | Product model and specification |
| MSLYFYVZ-75-9 | MSLYFYVZ-50-9 |
| structure size | Inner conductor of round copper wire | mm | two | three point five |
| Physical foamed polyethylene insulation | mm | eight point eight | eight point eight |
| Parallel conductor grid type outer conductor | mm | ten | ten |
| Black polyethylene inner sheath | mm | twelve point five | twelve point five |
| Color PVC outer sheath | mm | fourteen point five | fourteen point five |
| Electrical performance | Withstand voltage (A.C) | V/min | 1500/1 | 1500/1 |
| Insulation resistance at 20 ℃ | MΩ·km | one thousand | one thousand |
| characteristic impedance | Ω | 75±3 | 50±3 |
| Attenuation constant | 60MHz | dB/km | ≤40 | ≤45 |
| 150MHz | dB/km | ≤55 | ≤60 |
| VSWR 60~150MHz | ≤1.5 | ≤1.5 |
| Coupling loss | 60MHz | dB | 80±10 | 85±10 |
| 150MHz | dB | 80±10 | 75±10 |
Keywords: mining leaky cable_ mining double sheathed leaky coaxial cable_MSLYFYVZ-75-9 leaky cable_MSLYFYVZ-50-9 leaky cable
Contact: Mr. Liu (* * *) QQ: 1915161926 Email: 1915161926@qq.com Website: * * *. com
