On-line monitoring device for roll gap of plate blank continuous casting machine

The invention relates to an on-line monitoring device for roll gap of a plate blank continuous casting machine, which belongs to the technical field of metallurgy professional measurement device. The middle part of a displacement sensor of the device is fixed on the middle part of the internal surface of an upper measurement positioning board through an upper positioning seat of a measuring rod, and the lower end of the displacement sensor is movably inserted in a lower positioning seat of the measuring rod; a sensing end of the displacement sensor is extended out of the upper and lower measurement positioning boards respectively; the upper and lower positioning seats of the measuring rod are movably sleeve and connected with each other; the two sides of the internal surface are fixedly connected with two upper guide rod positioning seats respectively, and the two upper guide rod positioning seats are movably sleeved and connected with the two lower guide rod positioning seats respectively; and the upper and lower measurement positioning boards are extended toward the two ends along the width direction respectively so as to form support heads which contact with an upper continuouscast roller and a lower continuous cast roller during measurement respectively. In the invention, the abnormal changes of the roll gap can be found in time by the displacement sensor tracking the measuring value of the roll gap and analyzing the trend in an on-line manner, and the overhauling work can be quantitatively instructed, thereby improving the overhauling efficiency and being favorable to improving the capacity and reducing the mass loss.