双阶梯卷筒是一种带有阶梯法兰盘和双阶梯截面的综合式卷筒，可在变幅机构的非工作区段使钢丝绳多层卷绕，以缩短卷筒长度；
Double step drum is an integral drum with stepwise flanges and double step sections. It allows the multiple layer rope winding in non-operating portion of luffing mechanism to make drum shorter.
RACO的弹簧式制动调节器设计用于电动车辆，比如有轨电车，矿车，缆车和卷筒或盘式制动器。
RACO's spring loaded brake actuators are designed for electric powered vehicles such as light rail street cars, trams, cable cars, with drum or disk brakes.
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