Warehouse door is to facilitate the storage of the loan-to-access, in order to achieve this objective. The design of the off-door, the door of each four meters wide, six meters high, weight 900 kg. Closed the door open for the drive motor drive, and two doors share a motor. A cylindrical motor driven three straight teeth reducer, the output shaft in reducer with sprocket, the expansion-card door to the chain of cards in the mouth, when the rotation when the sprocket chain driven movement so that the door chain synchronization with the movement. In order to achieve the two doors can be opened simultaneously closed, the output shaft in the motor also has a gear, and another door of the same size gear sprocket axis of engagement so that another door of the motor and direct drive sprocket Moving the sprocket and the same speed in opposite directions. The doors opened and closed by the positive and motor control. When the door opened to the limit position, the door will guide the trip switch contact pressure to stop a motor rotation. The main agencies involved in the transmission mode for the chain drive. Since each door four meters wide in the so-linked system of the two sprocket design center distance of 4.5 metres, in order to prevent the center from a drop too much linked with increased distance to the chain tension. The chain axle-shaft cantilever used, in the end stretch of embedded in the wall plate, in the shaft surface car nut threaded shaft with its fixation on the plate.