Preheating roll insulation system

The present invention discloses a preheating roll insulation system, including storage tanks, a circulation pump, a heater, a cooler, the upper roll, lower roll, and a controller, said inner upper rolls and the lower roll provided with an oil chamber, said oil inlet duct is provided on the heater temperature sensor. The present invention is by hot oil to the roller conveyor, can be pre-rolling before hot roll, to prevent the magnesium alloy sheet produced under low temperature rolling rolls crack; while adjusting the oil temperature during the rolling process by the controller controls the heater and a cooler, can the roll temperature is always maintained within the temperature range of process requirements, can be avoided due to high temperature can not be timely roll away heat generated during rolling, resulting in a magnesium alloy sheet appeared burnt, grains become large, the mechanical properties decrease problem, and to avoid the central lower roll temperatures results in the temperature of the rolling rolls sucked rolling cracks occurring problem.