The electric expansion door is mainly composed of three parts, which are the telescopic door, the head and the controller. 1, a telescopic door body: a telescopic door body is composed of a door body frame, cross bracing, axis (axis, sliding axis) and the chakras and other main components. The whole door body is a metal structure, and it is divided into stainless steel door, aluminum alloy door body and die-casting aluminum door. 2, head: composed of the drive and electric part, it is fixed at one end of the door body to drive the expansion movement of the door body, and use it with the door body. The drive is divided into common type and robot type. 3. The controller consists of a control box, a desk controller and a handle remote control. 1), control box: fixed in the head, it receives the instructions issued by the controller to control the operation of the door. 2), desktop controller: mainly on duty personnel on duty indoors. 3), handle remote controller: mainly equipped with vehicles, in the head around 10-30 meters (according to the site of the radio communication environment) activity control gate opening and closing.