Main shaft bearing testing machine based on internal force method and use method thereof

The invention belongs to the technical field of bearing detection, and provides a main shaft bearing testing machine based on an internal force method and a use method thereof. The main shaft bearing unit is connected above the main shaft bearing base; the loading transition flange is sleeved on one side of a bearing of the main shaft bearing unit and is connected with one end of the loading main shaft, the other end of the loading main shaft is sleeved on the loading main shaft bearing seat, and the loading disc is sleeved on the loading main shaft; the driving system is connected with the loading main shaft bearing seat; two ends of the thrust loading system are respectively connected with the Y-direction loading system and the loading disc; and the radial loading system and the tension loading system are respectively connected with the main shaft bearing base and the loading disc. During specific operation of the main shaft bearing testing machine based on the internal force method, an internal force loadi