Train axle detection alignment device

A train axle detection alignment device belongs to the field of auxiliary alignment devices for acceptance and detection of railway train axles of different lengths. The train axle detection alignmentdevice includes a longitudinal double-guide-rail base, two vertical props, two axle radial positioning seats, a cam cylinder and a base slide thereof, a double-link alignment mechanism based on a camturntable, two axle end tightening mechanisms, a gear box support mechanism and a displacement detection mechanism. The two axle end tightening mechanisms of the invention can synchronously and reversely transfer the driving force of the double-link alignment mechanism, an alignment roll pressure head can apply the driving force to the end of an axle, and a traction rod shaft can apply the driving force to a ranging piston rod. Thus, a ranging piston cylinder on the displacement detection mechanism can measure the displacement along the oblique direction as a driven part, the rough value of the horizontal displacement