HYDRAULIC LIFTING SYSTEM FOR THREE-TOWER DOUBLE-SECTIONED WINDER OF WIDE HEADER Russian patent published in 1997 - IPC

FIELD: agricultural engineering. SUBSTANCE: hydraulic system has two piston cylinders 1 and 2 mounted below middle supporting device 7 of winder and two plunger cylinders 3 and 4 mounted at side supporting devices 6 and 8 of winder. Stems 9 and 10 of piston cylinders 1 and 2 are rigidly interconnected and piston cavities 11 and 12 are connected via oil guide 13 and with pressure main 14. Stem cavities 15 and 16 of cylinders 1 and 2 are communicated via oil guides 17 and 18 with working cavities of related plunger cylinders 3 and 4. Hydraulic cylinders 1,2,3,4 are pivotally connected with body of header 5 and supporting devices 6,7,8 of winder. Connection of piston cavities 11 and 12 of cylinders 1 and 2 to pressure main 14 causes movement of pistons 19 and 20, which displace working fluid through oil guides 17 and 18 into working cavities of plunger cylinders 3 and 4 to move the cylinders. As a result, header is lifted. Connection of piston cavities 11 and 12 of cylinders 1 and 2 to working fluid hydraulic tank causes lowering of plungers of cylinders 3 and 4 under the weight of winder. As a result, working fluid is displaced into stem cavities 15 and 16 of cylinders 1 and 2, whose pistons 19 and 20 are lowered and, as a result, header is lowered. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 1 dwg