Mechanical design fast shutter doors fast shutter doors mainly for logistics, clean room, underground parking, heat setting more stringent workplace design, so the purchase of fast shutter doors accessories when the need to consider the following aspects: Part 1. Fast shutter doors including curtain, motor, control system, steel, hardware. 2. All components are plug-in components, making installation very easy. 3. Motor: drive motor with imported motor, power, adjustable and strong. 4. Rail: horizontal double rail structure, in the form of being suspended, was placed side to solve the problem, so as to ensure the stability of the door leaf. Sealed on both sides and with a brush to form a sealed rail, to avoid the dust and wear on rails and pulleys, to achieve the easy maintenance features. 5. Pulley: the use of special nylon pulley, high strength, wear resistance, and at the same time there is a certain damping effect. 6. Belt: The toothed belt, toothed belt is a cross-sectional curve design, increasing the height of the tooth, improving the fit of the belt and the drive gear, thereby increasing the service life.