PILOT CONTROL MECHANISM FOR BOOM BOUNCE REDUCTION

摘要

A hydraulic system (600) and method for reducing boom dynamics of a boom (30), while providing counter-balance valve protection, includes a hydraulic actuator (110), first and second counter-balance valves (300, 400), first and second control valves (700, 800), and first and second blocking valves (350, 450). A net load (90) is supported by a first chamber (116, 118) of the hydraulic actuator, and a second chamber (118, 116) of the hydraulic actuator may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response (950) that counters environmental vibrations (960) on the boom. The first blocking valve prevents the fluctuating hydraulic fluid flow from opening the first counter-balance valve. The first blocking valve may drain leakage from the first counter-balance valve.

主权项

1. A hydraulic system comprising:
a hydraulic actuator including a first chamber and a second chamber; a first counter-balance valve fluidly connected to the first chamber at a first node; a second counter-balance valve fluidly connected to the second chamber at a second node; a first control valve fluidly connected to the first counter-balance valve at a third node; a second control valve fluidly connected to the second counter-balance valve at a fourth node; and a first valve fluidly connected to a pilot of the first counter-balance valve at a fifth node and fluidly connected to the second counter-balance valve and the second control valve at the fourth node.