Auxiliary automatic starting device and method for turbine-driven ultra-high-speed low-temperature bearing test

The invention relates to an auxiliary automatic starting device and method for a turbine-driven ultra-high-speed low-temperature bearing test. According to the invention, a friction wheel assembly is adopted in an extremely small space, 90-degree transmission is realized by adopting a universal coupling structure, radial friction is performed on a coupling in a double-span rotor, and the problems of small starting torque, over-high instant starting and the like of a turbine driving test system are solved; and a basic support is provided for stability and safety of test operation of the ultra-high-speed low-temperature high-speed bearing. And meanwhile, structures such as a sliding table air cylinder, a linear sliding rail and a force sensor are adopted, application and automatic withdrawing of the load are achieved, it is guaranteed that the applied load is accurately controlled while application of the auxiliary starting radial load is achieved, and the coupler structure can be withdrawn in time after auxili