Oil drainage magnetic plug device for lubricating oil pipeline of aero-engine

The invention provides an oil drainage magnetic plug device for a lubricating oil pipeline of an aero-engine, which comprises a shell assembly fixed relative to an oil return pipeline, the shell assembly comprises a shell, a top cover and a shell spring, the side wall of the shell is provided with a main circulation hole through which a vertical axis penetrates, the top cover is arranged at the inner top end of the shell, and the shell spring is arranged between the shell and the top cover; the oil drainage magnetic rod assembly is arranged in the shell assembly, the oil drainage magnetic rod assembly comprises an oil drainage rod, a magnetic rod assembly and a magnetic rod spring, the oil drainage rod comprises an oil drainage rod main body and a piston body fixed relative to the oil drainage rod main body, and an axial through oil drainage hole is formed in the oil drainage rod main body; the magnetic rod assembly comprises a supporting barrel and a magnetic body fixed to the top of the supporting barrel, a