Production method of high-fire-retardant and fire-resistant cable for CRH train

Abstract

The invention discloses a production method of a high-fire-retardant and fire-resistant cable for the CRH train, and belongs to the technical field of the cable. The method comprises the following steps: (1) insulation layer extrusion: selecting a single screw extruder in 80mm or 1200 to extrude according to the cable diameter, wherein the extrusion temperature is controlled at 160-180 DEG C; (2) cable-forming: selecting a cable former according to the core number, selecting a pair twister if the core number is less than 8, and selecting a cage twister if the core number is more than 8; (3) fireproof material filling: filling the fireproof material between the cores in the core cable-forming process; (4) wrapping a fireproof layer: wrapping the fireproof layer by using the longitudinal wrapping machine after the cable forming, wherein the lapping coverage rate of the fireproof layer is not less than 30%; and (5) sheath layer extrusion: selecting the single screen extruder in 800 or 120mm to extrude, wherein the extrusion temperature is controlled at 160-170 DEG C. The cable obtained in the invention can guarantee and maintain the unchanged transmission characteristic when being exposed to 800 DEG and in a mechanical shock environment; and the use performance is good.

Description

technical field [0001] The invention belongs to the technical field of electric cables, and more specifically relates to a production method of high flame-retardant and fire-resistant cables for multiple train units. Background technique [0002] Fire-resistant cables refer to cables that can maintain safe operation for a certain period of time under the condition of flame burning. my country's national standard GB12666.6 (such as IEC331) divides the fire resistance test into two grades, A and B. The flame temperature of grade A is 950-1000 ℃, and the continuous fire supply time is 90 minutes. The flame temperature of B grade is 750-800 ℃, and the continuous fire supply time is 90 minutes. , During the entire test period, the sample should withstand the rated voltage value specified by the product. Fire-resistant cables are widely used in high-rise buildings, underground railways, underground streets, large power stations, important industrial and mining enterprises and othe...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the existing EMU fire-resistant cables cannot ensure the continuity of power supply and signal data transmission in the event of a fire, the present invention provides a production method for EMU high-flame-retardant and fire-resistant cables. The steps of the method are connected in an orderly manner. The optimization and improvement of the process steps make the fire-resistant performance of the high-flame-retardant fire-resistant cable of the EMU reach the best. The cable is exposed above 800 ℃ and in the environment of mechanical shock to ensure and maintain its unchanged transmission characteristics and good performance.

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