| 摘要 |
FIELD: construction and road-building machines. SUBSTANCE: hydraulic-mechanical system includes hydraulic reservoir, hydraulic pump, main hydraulic control valve, hydraulic cylinder or hydraulic cylinders for lifting blade, speed gear-box, unit of follow-up hydraulic control valve placed along lengthwise symmetry axis of BULLDOZER pivots. Isolating valve and slide valve are placed inside hydraulic control valve housing. The first cavity is hydraulically communicated to the third one, and the forth cavity is hydraulically communicated to the fifth one. Pull-bars has traps on free ends to be connected to pivots. Operating branch lines deflected from follow-up hydraulic valve may be connected to rod and piston cavities of the hydraulic cylinder or hydraulic cylinders and be open to isolating valve. Filling valve may include housing, seat with valve opening, spring loaded closing member and rod of the sensor of pushing force. EFFECT: high efficiency. 3 cl, 2 dwg |
