The lift door is a kind of door made of soft fabric which is divided into two layers. The connections between the fabric is aluminum made crossbeam. The door lifts vertically with the motive guide track, which can be used in the conditions where the top beam of opening has different layers and not in the same line. This door is installed inside of the opening and not takes up the space inside and outside. The door fabric cloth will move first when the door open and will be stacked above the opening head. Then the motive guide tracks turn and position under the cloth. When it close ,the guide will pack first, and then the cloth drop until to the end. The top bearing beam should be connected to the roof truss as a whole structure, with the hanging point, hoisting winch, fixing pulley, hanging beam on it and also bearing the weight of door. Steel structure guides and sealing members shall be installed on the jambs. The door consist by horizontal structure, bottom beam (truss structure), high strength double layers of PVC polyester fabric door surface and the guide wheels which free of maintenance. Maintenance-free guide wheels will be installed on the both ends of horizontal structure (one set on each end) and the bottom beam (two sets on each end). High strength door surface will be fixed to the ribs and bottom beam by the aluminum strips and the self-tapping screws. Steel wire rope for door lifting will be fixed on the bottom beam, but not fixed to the horizontal beams …
