| 摘要 |
PROBLEM TO BE SOLVED: To provide a controlling structure for lifting and lowering of a rice transplanter capable of controlling a control current of an electromagnetic type flow control valve for controlling the lifting and lowering operation so that the lifting and lowering operation of a seedling planting device can smoothly be carried out. SOLUTION: This posture controller for a working car is composed so that the seedling planting device can be lifted and lowered by charging a pressure oil from a hydraulic pump 30 driven with an engine 6 is charged through an electromagnetic type flow control valve 41 to a hydraulic cylinder 3 for lifting and lowering. When the seedling planting device is set at a prescribed plowing depth, the electromagnetic type flow control valve 41 is composed so as to regulate the value of the control current of the electromagnetic type flow control valve 41 with a duty ratio so that the quantity of the pressure oil sufficient to the make up for a deviation of the height of the seedling planting device from the prescribed height should be charged into the hydraulic cylinder 3. The controller is composed so as to make a correction so that the duty ratio is increased when the speed of the engine 6 is reduced. |
