The polished rod clamp is of butterfly structure, it is fixed on the polished rod as retaining device for the wire hanger. It makes the pumping unit horse-head connected with polished rod through rod eye lifting device, and then the polished rod append and support the load of sucker rod string. The polished rod clamp is an important part connecting oil pump and sucker rod, it is required not only reliable, have a certain capacity, but also can not cause damage for sucker rod.
