Solid insulated filled cables are suitable for pipeline laying in coal mine pipelines, mainly used for pipeline laying. Fill or pour petroleum paste on the inner and outer surfaces of the cable core and shielding layer to prevent moisture from entering the coal mine. Under the common environmental conditions of 30-60 ° C in coal mines, the mechanical and electrical performance of communication cables used in coal mines remains unchanged. Used for communication lines in level tunnels, inclined tunnels, and mechanical and electrical chambers, as well as for main signal transmission in level tunnels, vertical shafts, or inclined shafts. $r $n Mining Underground Monitoring Communication Cable MHYV-1 * 4 * 7/0.52
Mining underground monitoring communication cable MHYV-1 * 4 * 7/0.52
The usage method of mining communication cables is as follows:
Mining underground monitoring communication cable MHYV-1 * 4 * 7/0.52
Check the cableCarefully inspect the appearance of the cable, check for any damage, flattening, twisting, etc., and ensure that the insulation and shielding layers of the cable are intact and undamaged. At the same time, verify whether the specifications and models of the cables are consistent with the design requirements, and check whether the length of the cables meets the laying requirements.
planning pathAccording to the layout of the mine and the design requirements of the communication system, plan the cable laying path. Try to choose a safe and stable route, avoid contact between cables and high-temperature equipment, flammable materials, corrosive substances, etc., and also avoid areas that are prone to mechanical damage, such as corners of tunnels and places where equipment frequently moves.
Prepare tools and materialsPrepare the necessary tools for laying cables, such as cable laying racks, pulleys, traction ropes, tighteners, cutting tools, insulation tape, identification signs, etc. Meanwhile, prepare auxiliary materials such as cable protection pipes and cable trays as needed.
Place the pay off rackPlace the cable reel on the pay off rack, ensuring that the cable reel can rotate freely and the pay off direction is consistent with the laying path. Assign a dedicated person near the cable reel to observe the release of cables and prevent issues such as entanglement and knotting.
traction cableFor shorter distance laying, cables can be manually dragged, but care should be taken to avoid friction between the cables and the ground. For long distances or difficult installation situations, traction ropes can be used to pull through pulleys and other devices. During the traction process, it is necessary to control the traction speed and force to avoid excessive stretching of the cable. When cables pass through protective pipes or cable trays, attention should be paid to preventing the outer skin of the cables from being scratched.
Fixed cableDuring the cable laying process, it is necessary to fix the cables at regular intervals to prevent them from shaking or shifting. Generally, cable hooks or clips are used to fix on the walls or supports of tunnels, and the fixed spacing should be reasonably determined according to the weight of the cable and the laying environment, usually 1.5-2 meters. Fixed points should be added at cable bends, branches, and equipment entry and exit points to ensure the stability of the cable.
Reserved lengthWhen laying cables to various communication equipment or junction boxes, a certain length of cable should be reserved for subsequent wiring and maintenance. The reserved length is generally 0.5-1 meter, and the specific length can be determined according to the installation position and wiring requirements of the equipment.
Peel off the outer layer of the cableAccording to the wiring requirements, carefully peel off the outer skin of both ends of the cable using a cutting tool to expose the inner core. Be careful not to damage the wire core and shielding layer. The stripping length should be determined according to the interface requirements of the wiring terminal or equipment, generally 10-20 centimeters.
Connecting wire coreConnect the core of the cable to the core of communication equipment, junction boxes, or other cables. The connection methods usually include welding, crimping, etc. If welding is used, ensure that the welding is firm and avoid virtual welding; If crimping is used, appropriate crimping tools and crimping terminals should be used to ensure the tightness and reliability of the crimping. During the connection process, it is important to correctly connect the wires according to the cable's chromatographic identification to avoid misconnections.
Connect the shielding layerFor communication systems with shielding requirements, the shielding layer of the cable should be reliably connected. Generally, the copper wire or metal strip of the shielding layer is connected to the grounding terminal of the equipment or the shielding layer of other cables to achieve electromagnetic shielding effect and prevent external interference signals from entering the interior of the cable.
Sealing and ProtectionAfter the connection is completed, the connection part should be sealed and protected to prevent moisture, dust, etc. from entering the connection point, causing poor contact or short circuit problems. Insulation tape, heat shrink tubing, and other materials can be used to wrap and seal the connection points to ensure their insulation and protective properties.
insulation testUse an insulation resistance tester to conduct insulation tests on cables, measuring the insulation resistance between each core of the cable, as well as between the core and the shielding layer and ground wire. The insulation resistance value should comply with relevant standards and product technical requirements. Generally, the insulation resistance should not be less than 1000M Ω· km. If the insulation resistance value does not meet the requirements, the cause should be promptly identified and dealt with, such as checking whether the cable is damp or whether the insulation layer is damaged.
Conductivity testUse a multimeter or other tools to conduct a continuity test on the core of the cable, checking whether the core is connected and whether there is any open circuit. Ensure that each wire core can transmit signals normally, and for any discovered open circuit issues, locate the breakpoint and reconnect it.
Signal transmission testingAfter connecting the cable to the communication system, perform signal transmission testing. It is possible to check whether the transmission quality, bit error rate, attenuation and other indicators of the signal meet the system requirements by sending and receiving test signals. If problems are found in signal transmission, a comprehensive inspection of the cable laying path, connection points, equipment configuration, etc. should be carried out to eliminate faults.
acceptanceAfter completing various tests, organize relevant personnel for acceptance. The acceptance content includes the quality of cable laying, connection quality, test data, etc. After passing the acceptance inspection, fill out the acceptance report and officially put the cable into use.
routine inspectionRegularly inspect the cables to check for any signs of damage or aging, loose fixing points, and changes in the surrounding environment. If damage, bulges, or detachment of fixing points are found on the outer skin of the cable, they should be repaired and dealt with in a timely manner.
environment checkPay attention to the environmental conditions in which the cable is located, such as temperature, humidity, corrosive gases, etc. If the environmental conditions exceed the applicable range of the cable, corresponding protective measures should be taken, such as strengthening ventilation, dehumidification, anti-corrosion treatment, etc., to ensure that the cable can operate in a good environment.
Regular testingRegularly conduct insulation resistance and conductivity tests on cables to promptly identify potential issues. Generally, testing should be conducted every 3-6 months. For cables that have been in use for a long time or have harsh environmental conditions, the testing cycle should be appropriately shortened.
Fault handlingWhen a cable malfunctions, it is necessary to promptly investigate and repair it. Firstly, determine the approximate scope of the fault based on its symptoms, and then use professional testing tools such as cable fault testers to determine the location of the fault point. After identifying the fault point, corresponding measures should be taken according to the type of fault, such as repairing the damaged insulation layer, replacing the damaged wire core, and reconnecting loose connection points. After the fault handling is completed, testing and verification should be carried out to ensure that the cable returns to normal operation.
