HYDRAULIC SYSTEM PROVIDING ENERGY RECOVERY BY DOUBLE SPOOL DIRECTIONAL VALVES DURING TILTING/LOWERING IN BUCKET CYLINDER ON LOADER SIDE AND IN ARM / BUCKET CYLINDERS ON EXCAVATOR SIDE IN BACKHOE LOADER, WHEEL LOADER AND EXCAVATOR MACHINES

摘要

The invention relates to a hydraulic system developed to provide energy recovery during tilting of the first pressure compensator tilting/lowering proportional directional valve (OR1) (2.1) in tilting/lowering-lifting cylinder hydraulic control block (2.0) in construction equipment such as backhoe-loaders, wheel loaders, wheel and crawler excavators. Said hydraulic system is positioned in the hydraulic control block (2.0) of the tilting / lowering-lifting cylinder in the bucket, arm and bucket cylinders (5.0) and prevents the tilting/lowering-lifting cylinder hydraulic control block (2.0) level losses in the cylinder during idle mode. Said hydraulic system comprises the following; the first pressure compensator tilting/lowering proportional directional valve (OR1) that provides flow control at the user input for minimum pump output flow (Q) and pressure, joystick movements when the joystick is not moving (2.1) and the second pressure lifting proportional directional valve (OR2) (2.2); third proportional throttle valve (OR3) (2.9) Provides automatic excavation transition period by canceling regeneration and pressure-dependent regeneration during excavation in idle tilting/lowering movements and controlling the flow rate depending on the pressure at the user exit; fourth check valve (2.8) and compensator (2.10); MP pressure sensor (2.14) in MP line, MA pressure sensor (2.12) in MA line and MB pressure sensor in MB line (2.13).