Book clamping device for library book taking robot

The book holder comprises an angle adjusting motor, one end of the angle adjusting motor is fixedly connected to the middle of one side of a connecting part, the other end of the angle adjusting motor is connected to the book taking robot through a rotating shaft, a sliding groove is formed in the center of the top of the connecting part in a concave mode, and a telescopic rod is clamped in the sliding groove in a sliding mode. One end of the telescopic rod is fixedly connected with the telescopic end of a telescopic motor, the bottom of the other end of the telescopic rod is fixedly connected with a rubber block, and the end, away from the telescopic rod, of the telescopic motor is fixedly connected to the connecting part; grooves are concavely formed in the two ends of the side, away from the angle adjusting motor, of the connecting part correspondingly, rotating shafts are rotationally installed in the grooves and rotationally installed in the connecting part, one ends of clamping arms fixedly sleeve the r