Drive chain scission between the drive sprocket and the cascade caused by the reversal; the drive chain cascade chain scission caused by the reversal, escalators seriously overloaded, resulting in insufficient motor torque and causes the drive to reverse, the drive sprocket and between Cascade belt slipping caused by the use of reversal, escalators and moving walkways sudden malfunction in the operation of the emergency stop, escalators customized working brake can not provide enough braking torque resulting in reversal. Cascade: Cascade Cascade with integral die-cast and assembled Cascade categories. ① overall Cascade Die Casting: As shown, escalators, whole cascade system aluminum die-casting, pedals and start casting plate 6.7 has ribs, anti-slip function and guiding role of the neighboring Cascade. This cascade is characterized by light weight (about half the weight of the assembly-Cascade), high appearance quality, ease of manufacture, assembly and maintenance. ② assembled cascade: as shown in Figure 6.8, fabricated rung by pedals, start plate, the bracket (above the casting) composed with the base plate (stamping), rollers, etc., Qingxian escalator manufacturing complex process, escalator manufacturers, assembled cascade size and positional tolerance of identity poor, heavy, not easy assembly and maintenance. Escalator picture | Noah Witt elevator (Online) | Qingxian escalator provided by the Texas Noah Witt Elevator Company. Texas Noah Witt Elevator Co. (www.dznywt.com) (www.dznywt.com) is an industry leader in Shandong Dezhou, machinery and industrial products, cooperation projects over the years, the company is implementing the scientific management, innovation and development, honesty and trustworthiness policy, and satisfy customer needs. Noah Witt Elevator leadership with the staff warmly welcome all inquiries negotiations to create Noah Witt elevator a better future.