Upper pinch roll device behind fixed-length shearing machine

The utility model relates to an upper pinch roll device behind a fixed-length shearing machine, and belongs to the field of metallurgy. A screw hole is formed in the center of the tail of an upper pinch roll shaft, a rear cover hole is formed in the center of a rear cover, the screw hole corresponds to a center hole in the axial direction, one end of an encoder shaft penetrates through the rear cover hole to be connected with the screw hole, the other end of the encoder shaft is arranged outside the rear cover, an encoder is arranged at the end of the encoder shaft and connected with an equipment control system through a data line, and a sealing ring is arranged between the rear cover hole and the encoder shaft. The encoder shaft is additionally arranged at the tail of the upper pinch roll shaft behind the fixed-length shearing machine, the encoder is connected with the control system through the data line, the control system controls equipment running according to data recorded by the encoder, and length measuring and length fixing are achieved.