| 摘要 |
PURPOSE: A control system for an agricultural machine is provided to develop a controller which contains a hydraulic circuit using a solenoid valve, which is inexpensive compared to a proportional control valve, and enables accurate and smooth control by an operator. CONSTITUTION: In the control system for an agricultural machine, such as a tractor, a discharge portion of a hydraulic pump is connected to a rising directional valve(1) via a priority valve(5) for the control of flow rate, the rising directional valve is connected to a port of a single-acting hydraulic cylinder through a rising line(11) and an orifice(4) or two-way directional valve(3), the port of the hydraulic cylinder is also connected to a falling directional valve(2) via a falling line(12), the falling directional valve is connected to a hydraulic tank through a T-line(14), and a check valve is inserted above the rising directional valve in order to prevent leakage of oil due to the weight of the machine. |
