Calender roller spacing hydraulic adjusting device with safety protection and online roller spacing adjusting functions

The utility model discloses a calender roller spacing hydraulic adjusting device with safety protection and on-line roller spacing adjusting functions, which comprises an upper connecting shaft, an upper lug ring, a connecting rod, a lower lug ring, a lower connecting shaft, a crankshaft, an oil cylinder lug ring and an oil cylinder which are respectively connected with an upper roller and a lower roller, two ends of the connecting rod are respectively connected with the upper lug ring and the lower lug ring, the lower lug ring is connected with the crankshaft through the lower connecting shaft, the crankshaft is connected with the end part of the lower roller, one end of the oil cylinder is connected with the crankshaft through the oil cylinder lug ring to do telescopic motion, and the other end is connected with the base through the oil cylinder lug ring to adjust the deflection angle of the crankshaft and adjust and control the roller spacing of the upper roller. The device adopts the hydraulic oil cylinde