As the transition layer between the engine's insulation layer and the fuel propellant column,the lining plays the role of bonding heat insulation,and its molding quality directly determines the safety and reliability of engine start-up.Currently,the testing of the integrity of molded lining is still one of the challenges in engine design.A set of coating integrity testing equipment equipped with an industrial camera is designed to achieve the comprehensive collection of the surface image integrity of the engine lining,and a control system is developed to enable the automatic operation of the equipment.The structural design of lining integrity testing equipment,the deflection simulation of the forestretch rod,the deflection experiment and theoretical calculation of the forestretch rod,the workflow of lining testing,the hardware composition and software design of the control system,and the operation test experiment of the equipment are emphatically introduced.Through the designed testing equipment and its control program,the automatic testing of lining is realized,which greatly improves the efficiency of testing.The experimental verification shows that the equipment works stably and reliably and has practical engineering value.
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