1results about How to "Large working range" patented technology

The application discloses a safety type rotary arm auxiliary hoist structure for a tower crane, which is arranged between a lifting mechanism and an amplitude changing mechanism, and comprises a stand column, the stand column is rotatably arranged on a balance arm, an auxiliary basic arm is arranged on the top of the stand column, an extension arm is movably arranged on the auxiliary basic arm along the extension direction of the auxiliary basic arm, an auxiliary winch is further arranged on the top of the stand column, a steel wire rope of the auxiliary winch is sequentially connected to an auxiliary hoist hook through a rope arranging pulley, a deflecting pulley and a fixed pulley, the rope arranging pulley is arranged on the auxiliary basic arm, the deflecting pulley is arranged on the stand column, and the fixed pulley is arranged on the extension arm. The rotary arm auxiliary hoist is arranged near the lifting mechanism and the amplitude changing mechanism on the balance arm, so that the customer can conveniently maintain and repair the rotary arm auxiliary hoist.