Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr
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COMPANY PROFILE-PAID ADVERTISEMENT Parker Hannifin's Hydraulic Pump Division The Hydraulic Pump Division of Parker Hannifin Corporation is a leading manufacturer of piston pumps, vane pumps and hydrostatic transmissions that set new industry standards for performance, precision control, responsiveness, service life, adaptability and low noise. Worldwide, Parker's advanced open- and closed-circuit pump technology helps mobile and industrial equipment users achieve greater efficiency from their hydraulic systems with the potential of reducing energy consumption. Products are manufactured in North America and Europe with field sales, technical support and distribution located throughout the world. Proven GOLD CUP® Technology Parker's renowned GOLD CUP® hydrostatic piston pumps and motors were introduced in 1975 (then Denison Hydraulics). Today, after more than 35 years of service, they continue to be recognized for superior long-lasting performance in demanding mining, exploration and drilling applications particularly. GOLD CUP pumps and motors range from 98 to 500cc/rev and are rated at 5,075 psi (350 bar). Parker's axial piston units can be fixed or variable displacement and can be tandem mounted for an even wider range of capacities and torque capabilities. Simply, there is a GOLD CUP solution for the biggest, toughest challenges found anywhere in the world today. A robust barrel-bearing design allows the GOLD CUP to run in stable condition at high speeds (up to 3,600 rpm) and pressures (5,000 psi continuous; 6,000 psi intermittent). This reliable construction yields a long lifecycle ideal for rigorous mining and hauling operations where equipment uptime means everything. Key closed-circuit configurations: • Variable pump/fixed motor. This combination provides a constant torque output at a fixed maximum pressure over the pump's full speed range. Speed and direction are controlled with a variable displacement over-center pump. Power from overhauling loads is regenerated back into the pump prime mover. Motor speed is limited to the maximum speed permitted by full pump displacement. The system is capable of full power only at maximum pump displacement. • Variable pump/variable motor. This combination provides for an extended range of motor speeds. At full displacement, the motor delivers maximum torque while speed and direction respond to displacement changes of the crossover center pump. This system has the capability of constant torque and rising power until the pump reaches full displacement and full power at elevated speeds as motor displacement and torque are reduced. Key design advantages: • Quick-change valve block. The valve block is the 'brain' of the GOLD CUP pump. It contains multiple poppet valves to provide relief and pressure functions including a built-in compensator. This unit is standarized for complete interchangeability between all GOLD CUP pump sizes. Should there be a problem—such as system contamination causing blocked orifices and/or sticking poppets—there is no need to shutdown equipment for troubleshooting. The quick fix is a simple and easy changeout to replace the valve block with a new one. • Quick-change controls. There is a GOLD CUP control to fit all application requirements, including adjustable displacement stops, manual screw adjusment, automatic brake and neutral bypass control, torque limit override, hydraulic stroker, electrohydraulic stroker, electrohydraulic servo, cylinder control, electrohydraulic cylinder control, and manual rotary servo. No matter which control option, the pump function is the same. There is no mechanical linkage between the control and pump, only four bolts attaching the control to the side of the pump. Once attached, a thin film of oil provides a hydrodynamic balance between the servo control and cam. This eliminates typical component wear found in unbalanced designs. All GOLD CUP controls are interchangeable from the smallest to the largest size pumps. For additional flexibility, the controls can be mounted on either side of the pump. Other key GOLD CUP features include a zero-backlash rotary servo design, fieldadjustable pressure compensator override, fast response replenishing checks and extremely fast compensator response (less than 100 milliseconds). More Information Catalogs, service manuals and technical bulletins for all Hydraulic Pump Division products can be found at www.parker.com. Contact the company directly at +1.937.644.3915 or via email at pumptechsupport@parker.com. 46 E&MJ; • DECEMBER 2012 www.e-mj.com