Abstract: The more and more extensive application of firefighting robots in fire disposal reduces the risk of firefighters in fire rescue, and also brings the demand for high temperature resistance and thermal protection technology. This paper takes the chassis body of a tracked fire fighting robot as the research object, in order to protect its internal electronic components from high temperature damage, and analyzes the distribution law of the body temperature field under the condition of fire field. Based on the orthogonal test design of the thermal protection structural materials of the fire robot chassis, the thermal protection performance of the combination of different thermal barrier coating materials, base materials and thermal insulation materials was analyzed by using ANSYS Workbench software, and the optimal combination scheme of the thermal protection structure was proposed.On the premise of ensuring the thermal protection performance of the firefighting robot, response surface optimization analysis was used to optimize the thickness of thermal barrier coating and thermal insulation layer. The thickness of thermal barrier coating and thermal insulation layer were reduced by 3.4 mm and 4 mm respectively. The internal volume of the chassis body was expanded by 11.74% and the mass was reduced by 15.83%.

Key words: fire fighting robot, thermal protection, finite element, orthogonal test