| 摘要 |
A follow-up control or priority control for a turnover plough with a pivoting-in of the plough frame, with a double-acting turning cylinder for turning the plough frame and with a double-acting pivoting cylinder for pivoting the plough frame in and out, which are both connected in parallel with one another and are to be actuated via a preferably common control valve in the inflow and flow-off conduits, has a control device comprising a first controlled valve and a second controlled valve, the first controlled valve being arranged in a pivoting-cylinder return conduit (for example, on the piston-rod side) which functions as an outgoing conduit for retracting the pivoting cylinder and the valve of which is controlled so that, with the pivoting cylinder extended, in the spring-loaded basic position, it shuts off the return conduit of the pivoting cylinder and connects the return conduit of the turning cylinder to the flow-off conduit, and the second controlled valve of the control device being arranged in the outgoing conduit of the pivoting cylinder, serving for extending the pivoting cylinder, and, in its spring-loaded basic position, connecting the outgoing conduit of the pivoting cylinder to the inflow conduit, the controlled first and second valves being controlled by means of auxiliary pistons.
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