device for actuation of an ultrasonic radprüfanlage for eisenbahnräder

摘要

A driving device for an ultrasonic train wheel control installation has an arrangement with three proximity switches (3, 6, 7) and with an ultrasonic emitter-receiver transducer (8) arranged in a section of a track (2) along which the wheel to be inspected travels. Before the ultrasonic transducer (8), in the direction of travel, are arranged a first and a second mtually spaced (a) proximity switch (3, 8) connected to a timing device. On the path between the second proximity switch (6) and the ultrasonic transducer (8) is arranged a third proximity switch (7) at a second distance (a/2) from the middle of the ultrasonic transducer (8). The third proximity switch (7) is connected to a second timing device by means of which an output signal can be generated after a delay that is derived from the time measured by the first timing device devided by the ratio between the first distance (a) and the second distance (a/2).