Transmission line insulator string maintenance pass pulley

The invention provides a transmission line insulator string maintenance pass pulley which is characterized in that the transmission line insulator string maintenance pass pulley is formed by the buckle connection of a semi-circular upper clamping ring (5) and a semi-circular lower clamping ring (7) (in figure 4), one end is hinged by using a pin shaft (6), the other end is connected to a nut (11) by using a T screw (10), and thus a T screw connection end can be tightened or loosened. The transmission line insulator string maintenance pass pulley has the advantages that the pass pulley can be fixedly mounted on an insulator steel cap easily and stably, the operation is simple, the disassembly is easy, the safety factor of a high attitude working is improved, the tool lifting distance by an operator is shortened or even eliminated, the labor intensity is reduced, the work efficiency is improved, the pulley hanging point pass limit is broken, the pass pulley is light, flexible, safe and reliable, the overall weight is small, and the pass pulley is convenient to carry.