DEVICE FOR CHECKING PARAMETERS OF HOLES IN AXLE BOXES OF RAIL CAR WHEELSETS

FIELD: railway transport; measurement technology. ^ SUBSTANCE: invention relates to devices for checking parameters of axle boxes of rail car wheelsets, namely, mean diameter and out-of-roundness in measured sections, and taper, and methods of application of said devices. Proposed device is made in form of common unit equipped with handle secured in upper of device and used for its carrying, fitting in hole of axle box and rotating, when fitted-in. Two standard inductive linear displacement transducers are used for checking linear dimensions of holes of axle boxes in places of location of two roller bearings fitted on neck of wheelset axle. Said transducers convert linear displacements into electric signals. Inductive transducers are rigidly secured in two cases on screw end of each cylindrical stop rod in turned, and in other tubular end spring-loaded cylindrical measuring tip is arranged whose rear part is in contact with spindle of inductive transducer. Ends of case of inductive transducers are arranged in guide bushings with flanges. The latter are secured on front and rear plates of instrument case. Instrument is furnished with arrester protecting inductive converters from mechanical action when bringing device into hole of box. Handle of arrester is combined with handle of device. With handle of arrester pressed on, working ends of cylindrical measuring tips and stop rods get inside guide bushings with flanges. Electric part of circuit terminates in electronic unit located in upper part of device close to handle. Alphanumeric indicator (display) is found in upper part of electronic unit. Processing of signals taken off inductive transducers is performed by turning device in hole of axle box through 360o, and results of measurement of parameters are displayed on screw of alphanumeric indicator after stopping of device. Full revolution of device takes from 7 to 10 sec. ^ EFFECT: improved convenience in use, reduced errors in measurements of parameters of axle box holes, reduced time taken for measurement and evaluation of condition of axle box as to its parameters. ^ 9 dwg