Device for fast detaching double-end bolt and detaching method of device

The invention discloses a device for fast detaching a double-end bolt. The device comprises a flat square pressure bearing block, an eccentric cylinder and a pneumatic rotating shaft. The flat square pressure bearing block is provided with a front end face and a rear end face which are horizontally arranged oppositely. A first axial through hole which penetrates the front end face and the rear end face in the axial direction is formed in the upper portion of the flat square pressure bearing block. A second axial through hole which penetrates the front end face and the rear end face in the axial direction is formed in the lower portion of the flat square pressure bearing block. A pressure bearing block body is formed on the lower portion of the front end face of the flat square pressure bearing block. An arc-shaped groove which extends in the axial direction and is connected with the second axial through hole is formed in the top face of the pressure bearing block body. The eccentric cylinder is located on the pressure bearing block body and is provided with an eccentric axial through hole coaxial with the first axial through hole. One end of the pneumatic rotating shaft penetrates the first axial through hole and then is fixedly connected with the eccentric through hole. The other end of the pneumatic rotating shaft is connected with a driving mechanism. The invention further discloses a detaching method of the device. The whole device is easy and convenient to design and low in weight (smaller than 0.5 Kg), and operation convenience of a single worker is guaranteed.