... used, generally in the 1-5 tons of load, running speed 1-60M/min. Directory Construction elevator Construction Elevator Key ... to install and maintain the level of hoists, rack rails running along the slope. Alpha Chongqing Construction Machinery Co., Ltd. ... 4, camera surveillance and intercom system, lifts running video see, you can call. 5, drive power, running speed and high efficiency. 6, zero ...