Device for searching spines by means of gravity

The utility model relates to the field of measurement and control, in particular to a device for searching spines by means of gravity. The device comprises a motor and an actuating mechanism, wherein the motor is used for driving the actuating mechanism to move up and down in the direction vertical to the surface of a book to be measured; the actuating mechanism comprises a screw rod connected with the motor; the screw rod is sleeved with a tension sensor; the tension sensor is connected with a vacuum sucker through a connecting pipe; the connecting pipe is provided with a gas inlet pipe; the book to be measured is arranged on a level surface of a turntable; and the turntable drives the book to be measured to rotate around a rotating shaft. According to the device, the vacuum sucker is used for sucking four positions of the surface of the book to be measured respectively, the tension sensor is used for measuring the gravity of the four points respectively, and one side on which the maximal gravity data are me