Flat-bottomed and rivet-free pressing piece type cross twist lock connecting device and method

The invention provides a flat-bottomed and rivet-free pressing piece type cross twist lock connecting device. The connecting device comprises a supporting frame, an electromagnetic driving device, anelectromagnetic moving plate, guide plates, a stamping implementation mechanism, a cylinder block and an expanding sheet. The cylinder block is used to place boards. The supporting frame comprises a top supporting plate, a directing plate and a bottom supporting plate. The electromagnetic moving plate is arranged between the top supporting plate and the directing plate. The stamping implementationmechanism is arranged under the electromagnetic moving plate. The electromagnetic driving device drives the electromagnetic moving plate to drive the stamping implementing mechanism to rotate and press down so as to spin the expanding sheet into the boards to assist in completing the board connection. The invention further provides a flat-bottomed and rivet-free pressing piece type cross twist lock connecting method. Boar