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What technology is used for handling high pressure rubber sheath cable joints in mines
- May 18, 2017 -

The high voltage power transmission of the main excavation equipments in iron ore mining field all use UCF-6kV type mine high-pressure rubber sheath cables. Because of the sealing, insulation performance and mechanical strength of the conventional plug-and-binding method, it is not possible to meet the relevant technical requirements, one to the rainy days, the frequent grounding, short-circuit and firing of cable joints, and become a long-standing problem in the mining field production operations. Through repeated investigation of the treatment method of HV rubber sheath cable joints in other mines, combining the actual situation of the mine stope, the final decision adopts the cold curing technology to treat the high pressure rubber sheath cable joints of mine.

⑴ High pressure rubber sheath cable joint cold-curing vulcanization treatment ① mining high-pressure rubber sheath cable connector filler.
Use JA-8 mine cable pu cold glue. It has a fast curing at ambient temperature, strong adhesion with cable sheath, tensile tear resistance, abrasion resistance and good electrical insulation properties, is a good sealing material for the on-site treatment of cable joints.

② mining high-pressure rubber sheath cable joints exploitation.
In the mine high-pressure rubber sheath cable joints on both sides of the 50mm is cut into a cone, both sides of the cable cone and cylindrical junction of the distance of 350mm. Connector at the core line stripping off the skin length about 30mm, using copper pressure to take over the connection to ensure the quality of the crimping. The plastic wrap tape is used to improve the insulation degree between the core wires. Before patching, you must disconnect the power supply, and then eliminate the mine high-pressure rubber sheath cable breakage and the surface of the surrounding mineral powder and oil. Rubber sheath cable joints on both sides of the cone surface of the use of wooden filing hair, exposing fresh surfaces, and keep clean.

③ mining high-pressure rubber sheath cable connector dies.
Selecting Mould is one of the keys to ensure the curing of joints. The use of high pressure polyethylene flakes of the mold is a one-time consumables, only in the factory and flat strip use, and the demoulding time is longer. The material of self-made mould is Q235 ordinary carbon structure steel, also known as A3 board. This mould is high in strength and can be used for a long time. In the middle of the mould length direction of the self-made drill 3 M20 screw holes, of which 1 are used to install the Feed hopper, the remaining 2 as vent holes to ensure that the mold and the filler between the gas smoothly discharged. The mould is opened in half and the inner surface is galvanized to improve the smoothness of the cable connector surface.

④ mining high-pressure rubber sheath cable connector filler.
Make the cable of the patch straight as far as possible, and place the mould in the horizontal position, and install it on the connector part of the cable. 3 screw holes upward, using M10 bolt fastening, Kai upper off sole material of A and B components of packaging cans, the composition of all the components into a component, with a dry stirring rod fast stirring 1min or so, mixing evenly the glue into the funnel slowly. When the overflow holes on both sides of the funnel are flowing out of the glue, the cavity of the mould may be filled with the glue material, and the pouring glue can be stopped. Each cable connector needs about 1.5kg glue. Summer 0.5h, winter 1h can be put into use.

⑵ High pressure rubber sheath cable joints cold-curing effect so far, the company's iron ore has been on the mining field 7 of the main equipment of high-pressure rubber sheath cable joints are all cold curing treatment. The practice of the mine has proved that this kind of treatment technology solves the problem of the fault of mine high-pressure rubber sheath cable joints.

① Water resistance test.
They will be vulcanized high pressure rubber sheath cable joints into the water used, never happened to a cable joint grounding, short-circuit and so on. The power outage caused by cable joints in the rainy season is almost nil. According to the statistic data of the mine, the high pressure rubber sheath cable joints used in the mining field before the cold curing process the number of failures January-July were 8, 11, 12, 14, 17, 20, 22 times respectively; The high pressure rubber sheath cable joints used in mining field after cold curing process, January-July The number of failures were 0, 1, 0, 1, 2, 2, 2 times. It can also be seen from the graph of fault statistic curves of high pressure rubber sheath cables for mine mining field. The curve fluctuation is larger before the cold curing process, and the fault rate of the high pressure rubber sheath cable is increased with the arrival of the rainy season. The waterproof performance of the cable joints after the cold curing process is good, no matter in winter and rainy season can ensure the normal transmission of electricity.

② cost analysis.
The average number of monthly failures of high pressure rubber sheath cables used in the mining field of the mine is L5 times before the cold curing process connector direct consumption costs for l500 yuan/month, the annual average cable consumption cost of 8300 yuan/month, due to the joint production loss of the l3608 yuan/month, total consumption of 23408 yuan/month. After adopting the cold curing process, each adhesive material consumption is 76.5 yuan, high pressure self-adhesive adhesive tape cost for l7.5 yuan/month, the joint direct cost is 6700 yuan/month, the output loss is 328 yuan/month, the total cost is 7ll3 yuan/month. Annual savings of high pressure rubber sheath cable 23408-7ll3=l6295 yuan/month.

3 Experience
The high pressure rubber sheath cable joints of the mine with cold curing vulcanization have good waterproof, electrical insulation and safe and reliable. Especially suitable for the rainy season production operation; The entire vulcanization process on-site operation, simple and convenient, by the ordinary workers can be completed, the joint processing time is short, recovery production fast; considerable economic benefits, can reduce the comprehensive cost of 195540 yuan a year, with good tensile and compressive strength.