Prevent the heavy object from gliding for being more effective, rise organization of crane add one rotate encoder, PG count mould change combine PLC with close ring system, make clivers more steady, more reliable. 为了更加有效的防止重物下滑,在桥式起重机起升机构各加上一套由旋转编码器、PG数模转换和PLC相结合的闭环系统,使主副吊钩拖动更加稳定、可靠。