Steel plate shear gauge and gauging method thereof

The invention provides a steel plate shear gauge. The steel plate shear gauge comprises a gauging trolley, a trolley driving motor and a conveying mechanism used for conveying steel plates, wherein two racks are arranged above the conveying mechanism in parallel in the steel plate conveying direction, a gear used for traveling is arranged at the lower end of the gauging trolley, the gear is meshed with the racks and is installed on an output shaft of the trolley driving motor through a speed reducer, an encoder is installed on the output shaft of the trolley driving motor which is connected with a frequency converter, and the frequency converter and the encoder are connected to a controller. The steel plate shear gauge further comprises a gauging baffle used for positioning the steel plates, wherein the gauging baffle is fixed to the gauging trolley through a lifting mechanism. The invention further discloses a gauging method of the steel plate shear gauge. Segmented control over the rotating speed of the trolley driving motor is achieved through segmented control over the output frequency of the frequency converter. According to the steel plate shear gauge and the gauging method thereof, the gauging precision of the shear gauge is improved greatly, and practicality is high.