| 摘要 |
<p>Oil-hydraulic control unit and method for supplying oil-hydraulic actuators in switch machines of railway points or the like, which control unit comprises a closed circulation circuit of an oil-hydraulic fluid, wherein at least a circulation pump with a delivery end and an intake end connected to a delivery line and a return line respectively of the circulation circuit of said fluid is provided and which delivery and return lines of the circulation circuit are connected to at least a oil-hydraulic actuator translating the point blades of the points respectively, for moving said point blades from one position to the other one of two end positions one of such positions being called normal position while the other one of said two positions is called reverse position, there being provided electrical means for functionally monitoring the movement of the point blades and/or that the end position the point blades have been moved to has been reached; timing means for stopping the actuating stroke of actuators moving the point blades when one of the end positions has been reached and/or after a predetermined operating time of said actuators moving the point blades and means for switching the direction of the actuating stroke, by reversing the circulation direction of the oil-hydraulic fluid to the actuator translating point blades for operating it in the opposite direction, the pump is of the reversible type like also the driving motor, the electrical means switching the movement stroke direction of the point blades being composed of switches reversing the power supply signal of an electric motor driving the pump for reversing the rotational direction of said motor and of said pump and which are driven when the point blades reach the proper end position such to generate said reversal of the circulation direction of the oil-hydraulic fluid flow in the circulation circuit.</p> |
