SU1245920A1 - Device for measuring wheel-rail engagement - Google Patents

Abstract

The invention relates to devices for determining the frictional properties in the zone of contact between the wheels and the rails. The purpose of the invention is to improve measurement accuracy and enhance functionality. The device has a housing with a handle 1 connected to the frame 2 by means of springs 3 and sleeves 4. On the side walls of the frame 2 there are fixed guides 6 on which there is a measuring roller 7 in the bearings associated with dynamometric springs 10. Ring troughs are used to accommodate cables 12. A braking device 14 is installed on the shaft of the coil 13. To measure, they move the device along the rail 21 and manually push the rod 17 and the connector 16 against the cylinder 15. through the flexible sheath 19 and the drain cable 20 13.2 yl. (L 1v 1C 01 with 1C

Description

The invention relates to devices for determining frictional properties in the contact zone of wheels with rails and can be used in industrial and urban transport.

The purpose of the invention is to improve measurement accuracy and enhance functionality.

FIG. 1 schematically shows a device, a general view; in fig. 2 shows section A-A in FIG. one.

The device consists of a housing with a handle 1, connected to the frame 2 by means of springs 3 and a sleeve 4. On the side walls 5 of the frame 2, guides 6 are fixed to which the measuring roller 7 is mounted by means of bearings 8. The measuring roller 7 through bearings 8 and liners 9 is associated with torque springs 10.

On both sides of the measuring roller 7, annular grooves 11 are arranged to accommodate the cables 12, which are attached to the grooves 11 and to the coils 13. On the shaft of the coil 13 there is a braking device 14 made in the form of a cylinder 15 and a block 16 with a brush 17. The braking device 14 serves to gradually stop the measuring roller 7 and is connected to the frame 2 by a spring 18, which serves to eliminate the self-winding of the cables 12 from the coils 13. In the frame 2, the sheath 19 of the flexible drain cable 20 is fixed, which is connected to the shaft 1 7 and is intended to increase braking force.

The entire device is mounted on the rail 21 on the support wheels 22. For convenience of winding the cables 12, a handle 23 is fixed on the shaft of the rollers 13. To record the friction coefficient, the output end of the measuring roller 7 has a pointer 24 opposite the scale 25 with dividing values set on the frame 2

ten

15

a force sufficient to prevent self-unwinding of the cables 12.

For measuring, the device is moved along the rail 21 and manually through the flexible sheath 19 and the drain cable 20 gradually press the brush 17 and the pad 16 to the cylinder 15 and thereby smoothly stop the rotation of the rollers 13. During the installation of the rollers 13, the housing 1 on the support wheels moves along the rail 21 and, in doing so, in the cables 21, the force will increase, due to which the measuring roller 7 along the guides 6 along the walls 5 of the frame 2 will move in the direction opposite to the direction of movement of the housing 1. Moving the measuring roller 7 will cause formation of load springs 10 which will accept the load via liners. According to the magnitude of the deformation of the torque springs 10 and the calibration scale 25 with the pointer 24, one can judge the strength and the friction coefficient. At the moment when the slip value increases to a critical one (for steel wheels about 20-25%), the maximum value of the adhesion coefficient can be determined. With a further increase in slippage, the growth in the coefficient of adhesion will cease even with a complete breakdown (when slippage is 100%), it will take a smaller value.

Thus, smoothly stopping the brake mechanism 14, gradually stop the rotation of the rollers 13, continuing at the same time the forward movement of the device and thereby changing the amount of slippage of the measuring roller 7 relative to the rail 21. Smoothly stopping the measuring roller 7, eliminate inertial components, which cause extra effort and thereby increase the accuracy of measurements.

Using frame suspension 2, made

20

25

35

in the form of springs 3 and sleeves 4, it is possible The device operates as follows. 40, determine the adhesion coefficient on the plate. Before starting the measurements, rotate the handle 23 and wind the cables 12 onto the coils 13 until they are fully tensioned. Then, pressing the body 1 to the rail 21, manually disperse the device on the support wheels 22.

these rolling surfaces and expand the range of application of devices of this type.

If necessary, for example, for a detailed analysis of the coefficient

50

When this occurs, the contact of the measuring clutch 5 from the amount of slip of the roller 7 to the rail 21 due to the deformation of the tension of the springs 3 occurs. The frame 2 moves along the sleeves 4 in the housing 1. The measuring roller 7 is then pressed to the surface of the rail 21 with a constant force equal to the total spring tension force 3.

When the body 1 moves under the force of adhesion to the rail 21, the measuring roller 7 in the bearings 8 will rotate, wind the cables 11 on the troughs 11 and wind them from the coils 13. The latter are pressed through the braking device 14 by the spring 18

or humidity, the proposed device can be equipped with strain gauges instead of liners and a slip sensor. In this case, it is possible to register the parameters on the oscilloscope paper.

Claims (1)

Invention Formula An apparatus for measuring the adhesion of wheels with rails, comprising a housing, a frame installed therein 2J with a measuring roller, the axis of which is connected through a cable with a coil and with a torque spring, characterized in that five a force sufficient to prevent self-unwinding of the cables 12. For measuring, the device is moved along the rail 21 and manually through the flexible sheath 19 and the drain cable 20 gradually press the brush 17 and the pad 16 to the cylinder 15 and thereby smoothly stop the rotation of the rollers 13. During the installation of the rollers 13, the housing 1 on the support wheels moves along the rail 21 and, in doing so, in the cables 21, the force will increase, due to which the measuring roller 7 along the guides 6 along the walls 5 of the frame 2 will move in the direction opposite to the direction of movement of the housing 1. Moving the measuring roller 7 will cause formation of load springs 10 which will accept the load via liners. According to the magnitude of the deformation of the torque springs 10 and the calibration scale 25 with the pointer 24, one can judge the strength and the friction coefficient. At the moment when the slip value increases to a critical one (for steel wheels about 20-25%), the maximum value of the adhesion coefficient can be determined. With a further increase in slippage, the growth in the coefficient of adhesion will cease even with a complete breakdown (when slippage is 100%), it will take a smaller value. Thus, smoothly stopping the brake mechanism 14, gradually stop the rotation of the rollers 13, continuing at the same time the forward movement of the device and thereby changing the amount of slippage of the measuring roller 7 relative to the rail 21. Smoothly stopping the measuring roller 7, eliminate inertial components, which cause extra effort and thereby increase the accuracy of measurements. Using frame suspension 2, made 0 five five these rolling surfaces and expand the range of application of devices of this type. If necessary, for example, for a detailed analysis of the coefficient adhesion of slippage adhesion of slippage or humidity, the proposed device can be equipped with strain gauges instead of liners and a slip sensor. In this case, it is possible to register the parameters on the oscilloscope paper. Invention Formula An apparatus for measuring the adhesion of wheels with rails, comprising a housing, a frame installed therein 2J with a measuring roller, the axis of which is connected through a cable with a coil and with a torque spring, characterized in that increase the accuracy of measurement and enhancement of functionality, it is equipped with a coil smooth braking mechanism, while the frame is spring-loaded in a vertical direction relative to the housing, and a dynamometric spring is mounted on the frame along its longitudinal axis and is connected directly to the axis of the roller. 8 24 25 3 13 15 Fmg.g