Automatic length measuring and scribing device and method for multi-length blank

The invention belongs to the field of mechanical transmission, automatic control and electrical equipment, and particularly relates to an automatic length measuring and scribing device and method for a multiple-length blank, and the device comprises a walking track, a front barrier gate, a rear barrier gate, a clamp, an automatic length measuring mechanism and an automatic scribing mechanism which are controlled by a PLC control system. The multiple-length blank subjected to primary cutting and number spraying enters the walking track from the previous working procedure; the front barrier gate is located at the inlet end of the walking track. The rear barrier gate is located at the outlet end of the walking track. The clamp is located on the side of the walking track. The automatic length measuring mechanism is located on one side of the front barrier gate or the rear barrier gate. The automatic marking mechanism is located on the side of the walking track. The device can improve mechanization and high effici