To a certain extent luffingcrane, lifting the lifting only allowed, if overweight, attention has danger of tipping.
对于变幅起重机，一定的幅度只允许起吊一定的吊重，如果超重，起重视就有倾翻的危险。
2
Portal crane sub frame and four-link arm two types, from the crane hoisting, luffing, slewing and walking four agencies ac frequency control, the machine USES PLC control, superior performance.
The double rocker mechanism (with back rocker driving) is used to luffing operation of floating crane. It has high productivity and transfer flexibility.