Metal plate fixed-length automatic shearing device

The utility model discloses a metal plate sizing and automatic shearing device. The device comprises a working platform, a roller, an aligning device, a plate pressing device, a shearing device, a sizing system and a controller. The controller can control the whole metal plate shearing process, and the automation of metal plate shearing is effectively improved. Meanwhile, due to the measurement of the sizing system and the positioning of equipment such as a correcting device, a pressing plate device and a pinch roll, the cutting accuracy is effectively improved, meanwhile, the actual position where the metal plate reaches is detected through a grating, and transportation equipment is automatically controlled; an encoder is used for measuring the length of the metal plate, the main shearing device and the auxiliary shearing device are automatically started, and the fixed-length shearing precision can be controlled to reach 5 mm. The problems that an existing shearing device is low in automation degree and prec