Non-contact rotary displacement monitoring device

The utility model relates to a non-contact type rotation displacement monitoring device. At present, the defect of a used contact type microswitch is that a cam is abraded, an elastic piece is abraded and the like in the using process, so that limiting transmission is not accurate. The non-contact type rotation displacement monitoring device comprises a frame structure (1), an induction armature (2) and a transmission shaft (3), the transmission shaft capable of movably rotating is vertically installed in the center of the frame structure and fixedly connected with the induction armature, and a starting induction switch (4) and a closing induction switch (5) are fixedly installed in the frame structure. Outgoing lines (6) of the two inductive switches penetrate out of the frame structure, the frame structure is fixedly connected with the angular travel air cylinder, and a transmission shaft of the angular travel air cylinder is connected with a transmission shaft on the frame structure through a concave-conve