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我厂２台５吨桥式吊车，大车及小车行走轮上安装有ＭＺＤ１—２００型电磁铁的制动器各３台，２台吊车共计６台；升降钢丝绳２个卷扬筒上安装有ＭＺＳ１—３００型电磁铁的制动器各２台，２台吊车共计４台制动器。在吊车使用过程中，时常烧坏制动器线圈，有时一个台班（８小时?
I plant 2 sets of 5 tons of bridge cranes, carts and trolleys on the MZD1-200 electromagnet installed on the brake each 3, 2 cranes a total of 6 sets; lift rope 2 winch tube installed MZS1- Two 300-type electromagnet brakes, two cranes a total of four brakes. In the process of using the crane, often burn the brake coil, and sometimes a station class (8 hours?