US Patent 7588076 Pumping and repairing unit

An oil machinery, that includes a pumping and repairing unit comprising: an electrically operated brake, a coupling, a speed reducer, an oil pumping polished rod, a polished rod eye for the oil pumping polished rod, an oil pumping polished rod rope, a balance weight case, a balance weight rope hanging device, a balance weight rope, a protection rope, a protection rope catching device, and a driving device. A workover rope is fixed to the driving and braking device, and has another end which is fixed to the supporting platform after it has wound around a fixed pulley block and a movable pulley block. An elevator is coupled with a lower end of the movable pulley block.