Patent ID: 8646730
Filing Date: 2014-02-11
Classification: B61L

Abstract:
1. A hydraulic oil control unit for supplying hydraulic oil actuators in switch machines of a railway point, comprising a closed circulation circuit of a hydraulic oil fluid, wherein at least one circulation pump is provided, with a delivery end of the pump being connected to a delivery line and an intake end of the pump being connected to a return line of the circulation circuit of said fluid, wherein the delivery and return lines of the circulation circuit are connected to at least one hydraulic oil actuator, the at least one actuator controlling movement of point blades of the railway point and translating said point blades by moving said point blades from a normal end position to a reverse end position or vice versa; electrical means for functionally monitoring the movement of the point blades and/or monitoring reaching the end position the point blades have been moved to; a timing cylinder for stopping an actuating stroke of said at least one actuator moving the point blades when one of the end positions has been reached and/or after a predetermined operating time of said at least one actuator, and means for switching a direction of the actuating stroke, by reversing a circulation direction of the hydraulic oil fluid to the at least one actuator translating the point blades in order to operate the at least one actuator in the opposite direction, wherein: the timing cylinder is a hydraulic timing cylinder distinct from the at least one actuator, the hydraulic timing cylinder detecting changes in flow parameters in the closed circulation circuit and, on the basis of said changes, operating one or more electrical switches breaking a power supply of an electrical motor driving the circulation pump, and the hydraulic timing cylinder detect said changes on the basis of hydraulic oil fluid supplied by the circulation pump to the hydraulic timing cylinder.