Medium-voltage cable fire-resistant and heat-insulating material screening method and device

The invention relates to the technical field of refractory materials and cable protection, and discloses a medium-voltage cable refractory and thermal insulation material screening method and device, and the method comprises the steps: selecting a supporting part, placing temperature thermocouple probes at the two sides of the central position of the supporting part respectively, and connecting the other ends of the temperature thermocouple probes to a temperature display instrument; selecting at least two different fire-resistant and heat-insulating materials, preparing the fire-resistant and heat-insulating materials into sheets, and respectively wrapping the sheets on two sides of the central position of the supporting piece in a winding manner to complete the manufacturing of a simulation sample; fixing the simulation sample in a testing device, heating the simulation sample by using a blast burner as a high-temperature fire supply source, measuring and recording the temperature change of the simulation s