| 摘要 |
For ploughs, in which, before each turn of the plough bodies, the centre of gravity is displaced into the ideal axis of rotation and, after turning has occurred, is displaced back into the working position again, corresponding switching elements are inserted into the hydraulic circuit for the purpose of the automatic execution of this operation, so that under special conditions, such as in alternating ploughing uphill and downhill, a displacement of the plough frame is possible during ploughing, and at the same time excluding the possibility that a rotation of the plough frame will commence. This is achieved by means of further feed conduits (40, 41) which are installed in addition to the first two feed conduits (38, 39) and to which are connected the connections (34, 35; 31, 32) of the conduits (36, 37) connecting the displacement cylinder (15) and turning cylinder (30) to one another. The points (47, 48) of the connection of the second feed conduits to the conduits (36, 37) are located nearer to the displacement cylinder (15) than the connection points (46, 49) of the first feed conduits, there being inserted into each of these connecting lines, between the respective connections (47, 48) of the first and (46, 49) of the second feed conduits, a non-return valve (47, 51), by which the valve (50) assigned to the piston side of the displacement cylinder is controlled. A pressurising valve (52) is connected in parallel with the non-return valve assigned to the piston-rod side of the displacement cylinder. <IMAGE>
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