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The High-voltage power transmission of the main excavating equipment in iron ore mining field adopts UCF-6KV type mine high pressure rubber sheath cable. As the sealing, insulation and mechanical strength of the conventional Plug and binding methods are not up to the relevant technical requirements, the frequent grounding, short circuit and shooting phenomena frequently occur in the cable joints, which has been a difficult problem in the mining field of the mine for a long time. Through repeated investigation of the treatment method of the cable joint of other high pressure rubber sheath in other mines, combined with the actual situation of the mine stope, the final decision was made to adopt the cold vulcanization technology to deal with the high pressure rubber sheath cable joint.
⑴ coal mine high pressure rubber sheath cable joint cold vulcanization treatment ① Mine high pressure rubber sheath cable connector filler.
Use JA-8 mine cable pu cold glue. It has a fast curing at room temperature, strong adhesion with cable sheath, tensile tear resistance, wear resistance and good electrical insulation characteristics, is the cable joint on-site treatment of good potting raw materials.
Exploitation of high pressure rubber sheath cable connectors for ② mines.
In the mine high-pressure rubber sheath cable joint at each side of the 50mm is cut into a cone, the two sides of the cable cone and cylindrical junction distance of 350mm. The core wire of the joint is stripped about 30mm, and the connection is made by copper pressure pipe to ensure the quality of the crimping. Use plastic wrap to wrap the tape to improve the insulation between the core wires. Before patching, must disconnect the power source, then eliminates the mine high pressure rubber sheath cable breakage to and the surrounding surface the mineral powder and the greasy dirt. The conical surfaces on both sides of the rubber sheath cable joint are punched with wood files, exposing fresh surfaces and keeping clean.
③ Mine high pressure rubber sheath cable connector die.
The selection of molds is one of the keys to ensure the vulcanization treatment of joints. The mould made from high pressure polyethylene sheet is a one-time consumable, which is only used in plant and flat zone, and has a long demoulding time. The material of self-made mould is Q235 ordinary carbon structural steel also called A3 plate. This kind of mould has high strength and can be used for a long time. 3 M20 screws are drilled in the middle position of the mold length, 1 of which are used to install the feed funnel and the remaining 2 as vent holes to ensure the smooth discharge of the gas between the mould and the filler. The die is half open and the inner surface is galvanized to improve the surface smoothness of the cable joint.
④ Mine high pressure rubber sheath cable joint rubber filler.
To straighten the patch cable as much as possible, and placed in the horizontal position, the mold installed in the cable joints, 3 screw hole up, the use of M10 bolts fastening, kai glue material of a, B packaging tank, the second component of all into a component, with dry stirring rod quickly stir around 1min, Slowly pour the mixture into the funnel. When the overflow hole on both sides of the funnel out of the liquid, indicating that the mold cavity may have been filled with plastic material, then can stop pouring glue. Each cable connector needs about 1.5kg of glue. Summer 0.5h, winter 1h can be put into use.
The effect of cold vulcanization on the cable joint of high pressure rubber sheath in ⑵ mine so far, the company iron ore has been to the mining field 7 main equipment of the high-pressure rubber sheath cable joints of all the cold vulcanization treatment. The practice of this mine for many years has proved that this kind of treatment technology solves the problem of the cable joint fault of high pressure rubber sheath of mine well.
① Water resistance test.
They will be vulcanized good high-pressure rubber sheath cable joints in the use of water, never occurred a cable joint grounding, short-circuit and so on. In the rainy season due to cable joints caused by the power outage accident is almost zero. According to the statistic data of the mine, the high pressure rubber sheath cable joint of mining field is used before the cold vulcanization process, the number of failures in January-July were 8, 11, 12, 14, 17, 20, 22, respectively. After the application of cold vulcanization to the cable joint of high pressure rubber sheath in mining field, the number of failures in January-July was 0, 1, 0 and 1 respectively. , 2, 2, 2 times. From the Mine mining field high pressure rubber sheath cable fault Statistics curve chart can also be seen, the amplitude of the curve fluctuation before the use of the cold vulcanization process was large, and the failure rate of the high pressure rubber sheath cable increased sharply with the rainy season; The waterproof performance of the cable joint after the cold vulcanization process is good, which can ensure the normal transmission of electricity in winter and rainy season.
② cost analysis.
The average number of L5 times of the monthly failure of the high pressure rubber sheath cable used in the Mine mining field before the cold vulcanization process, joint direct consumption cost of l500 yuan/month, the annual average cable consumption cost of 8300 yuan/month, due to the joint production loss of l3608 yuan/month, the total consumption of 23408 yuan/month. After the adoption of the cold vulcanization process, each joint rubber material consumption of 76.5 yuan, high pressure self-adhesive tape cost of l7.5 yuan/month, the joint direct cost of 6700 yuan/month, the output loss of 328 yuan/month, the total cost of 7ll3 yuan/month. Annual saving of high pressure rubber sheath cable 23408-7ll3=l6295 yuan/month.