The invention provides a gravity balance difference pumping unit which comprises a frame, an upper platform fixed to the top end of the frame, a first drive oil cylinder, a second drive oil cylinder, gravity combination rollers, a drive oil cylinder pull
rope, a balance weight pull
rope, a pumping rod, balance weight iron and a
hydraulic pump station. The first drive oil cylinder and the second drive oil cylinder are mounted on the front side and the rear side of the frame respectively, a
piston rod of the first drive oil cylinder and a
piston rod of the second drive oil cylinder are connected with a first movable
pulley and a second movable
pulley respectively, and the first movable
pulley and the second movable pulley can slide up and down on a movable pulley slideway of the frame. The upper platform is connected with a supporting wheel and a front bearing gravity wheel. The drive oil cylinder pull
rope is wound around the movable pulleys, the supporting wheel and the front bearing gravity wheel and fixedly connected to the gravity combination drive rollers. One end of the balance weight pull rope is connected with the balance weight iron, and the other end of the balance weight pull rope is wound around the supporting wheel and fixedly connected to the gravity combination rollers and connected with the pumping rod; under the action of the gravity combination rollers, the balance weight iron slides up and down along the slideway of the frame through the rollers on the two sides. According to the gravity balance difference pumping unit, output power is larger, a long
stroke is reached, and the technical problems that a conventional pumping unit is low in efficiency and high in
energy consumption.