Drives for heavy-duty shredders must be able to withstand frequent reversals in direction and stalling without damage. Unlike electromechanical drives, this poses no great challenge to hydrostatic drives.The Gold Cup series of hydraulic piston pumps and motors, from Parker Hannifin Corp., can reduce the total design cost while also increasing the productivity of shredders and waste reducers used to process difficult materials. Whether itÕs tires, debris, appliances, or furniture, heavy-duty shredders must operate with high torque and at high speed to rip through these materials quickly.
Gold Cup closed-circuit hydrostatic drives incorporate features that are often add-on items — integral servo and replenishing pumps, replenishing check valves, and stroking control mechanisms — in shredder/reducer designs. This selfcontained drive package can help OEMs achieve a smaller system envelope and potentially lessen the complexity of other external components, ultimately equating to a lower total design cost.
Many control options are offered for customizing in specific applications. The result is a more efficient hydraulic system that, in turn, will be cost effective for the end user to operate and maintain.
“To transmit low-speed, high-torque power for shredding applications, a gearbox could be used to reduce speed from an electric motor and multiply torque,” notes Doug Krantz, senior product engineer at Parker’s, Hydraulic Pump Div., Marion, Ohio. “Our Gold Cup technology is a natural fit for systems with gearboxes and those that use high-torque, low-speed motors as a direct drive.”
To ensure reliable delivery of hydraulic power, Gold Cup pumps are widely used to drive the cutter shafts on shredders, where a series of rotating cutters pulls debris through small openings to shear and reduce its bulk. These pumps have a maximum continuous operating pressure of 5000 psi and a maximum theoretical flow of up to 234 gpm at 1800 rpm. Typically, the pump feeds two pairs of hydraulic motors, with each pair mounted to either end of a cutter shaft. The Gold Cup hydrostatic drive offers capabilities such as reversing and stall, which are critical to the shredding process. These capabilities are also a big reason why hydraulics outperforms electromechanical drives in this application. Finally, in some designs, output from Gold Cup pumps can be used to power track drives and hydraulic fan drives to manage the engine’s thermal load.
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