Automatic magnetic saturation eddy current detection device for secondary surface layer defects of bearing ring and use method

The invention discloses a bearing ring subsurface defect magnetic saturation eddy current detection automation device and a use method, and relates to the technical field of bearing detection. The problems that an existing detection device cannot detect a magnetic bearing, the magnetic conductivity of a ferromagnetic material is far larger than one, eddy current can only be concentrated on the detection surface and cannot permeate into the material, and a magnetic saturator in the existing detection device is large in size, so that the existing detection device cannot move and is inconvenient to use are solved. The magnetic saturation unit based on the Helmholtz coil principle is additionally arranged, the size of the magnetic saturation unit is small, the defects that a traditional magnetic saturator is large in size, heavy in weight, incapable of moving and the like are overcome, a uniform magnetic field can be generated in the magnetic saturation unit, and a to-be-detected bearing ring in the magnetic satu