Excavators perform demanding work cycles involving powerful hydraulically-driven motions like bucket digging, arm swinging, and cab slewing. Having a reliable ekskavatör için hidrolik pompa that can supply high pressures and flow rates is crucial for excavator performance and efficiency.
Selecting the proper pump requires matching key specifications to the excavator’s operating requirements and duty cycle. Factors like pump type, pressure rating, displacement, and controls must be sized right for optimal power and response.
In this article, we’ll examine the hydraulic pumping needs of excavators and review pump options from leading manufacturers like Parker, Danfoss, and Rexroth.
High Pressure And Flow Rates Critical
Excavator hydraulic systems utilize three pumps – one for implementing boom, arm, and bucket actions, a second for driving the undercarriage, and a third for powering fan and pilot systems. The main implement pump handles the most strenuous duties.
This primary pump must supply high pressure, often 5,000 psi or more, to provide powerful digging forces and lift capacity. It also needs ample flow capacity to deliver fast cylinder response for smooth multi-function operation. Insufficient pressure or flow ratings result in sluggish performance that reduces productivity.
Large displacement piston and axial piston pumps from makers like Rexroth and Parker are common implement pump choices. These designs provide the high pressures and flow rates excavators require in a compact, robust package.
Handle Tough Duty Cycles
In addition to high outputs, the hydraulic pumps must stand up to excavator duty cycles with steep peaks and valleys in demand. During hard digging, the pump is under full pressure and flow loading. But pumping needs drop off when the implement returns and positions for the next dig.
This stop-and-go cycle is taxing on pump components. High-quality pumps utilize robust parts like steel-backed bronze bearings, hardened steel rotating groups, and wear-resistant valve plates to provide long service life. Keeping pumps properly maintained and rebuilding when needed is also important.
Advanced Controls
Electronically controlled variable displacement pumps are commonly used for excavators. This allows automatically regulating pump flow and pressure to match power unit speed and system demand.
Proper Sizing Vital
When specifying pumps, take detailed measurements of cylinder sizes, hydraulic motor loads, desired cycle speeds, and duty time fractions. This data helps properly size the pump’s pressure rating, displacement, and horsepower to avoid undersizing or wasting energy on overcapacity.