Device for controlling the surface topography of the wear of the rail head

 

(57) Abstract:

The invention relates to techniques for contactless control of the parameters of the head rail and can be used in a mobile measuring laboratory of rail transport in static condition and dynamics. The essence of the technical solution is that the matrix eddy-current Converter is implemented as a set of inductors, the centers of which are aligned at one point lying on the Central axis of the transducer. The device can improve the accuracy of control due to kvaziodnorodnoj local measure multiple points on the surface of the wear of the rail head. Point is approximated by the surface topography of wear, and it is measured width, depth and angle of wear at any point of this surface. 3 Il.

The invention relates to contactless control parameters of the lateral wear of the rail head and can be used in a mobile measuring laboratory of rail transport as in statics and dynamics.

Known devices for controlling the surface topography of the wear of the rail head, comprising a generator of high is clever rail, amplitude detectors, inputs connected to the outputs of the Converter, compensators, the inputs of which are connected to the outputs of the detectors, the signal processing unit Converter inputs connected to the outputs of the joints, and the memory block with the Registrar [1].

These devices allow to measure only one point of the surface topography of the wear of the rail head in its transverse profile at level 13 mm from the surface of the rail and on the obtained measurement value is indirectly judged wear (wear parameters) head. In practice, the surface wear of the rail head cross-section is non-linear in nature, so for a more accurate result of wear, it is necessary to measure several points on the ground surface in the transverse cross section of the rail.

The closest technical solution is a device comprising a high frequency generator, the switch matrix eddy current transducer and a computer to simulate the parameters of wear of the rail head [2].

In the description of this device is disclosed Converter block diagram. However, the experiments conducted on this device showed a good agreement with experimental and the reader and its structure, thereby reducing development time measuring device and to reduce financial costs.

The essence of the proposed technical solution is that the device containing the high-frequency generator, the switch matrix eddy current transducer, placed normal to the tread surface of the rail head, the amplitude detector inputs connected to the outputs of the Converter, compensators, the inputs of which are connected to the outputs of the detectors, the signal processing unit Converter inputs connected to the outputs of the joints, and the memory block with the Registrar, the Converter is implemented in the form of n inductors of the Converter, the centers of which are aligned at one point lying on the Central axis of the transducer perpendicular to the running surface of the rail head, the size in the direction of the cross section of the rail each subsequent of n inductors, starting from the inner performed exceeds the size of the previous coil, and the number of amplitude detector and compensator is chosen equal to the number n of coils.

The technical result of the invention is the provision of safety rail is aparecem profile. Reliability is improved due to kvaziodnorodnoj local dimension "n" points of surface wear on the head of the cross-section of the rail, by approximating the elevation of the curve surface wear, and it is measured width, depth and angle of wear at any point of this surface.

In Fig. 1 shows the structural diagram of the device of Fig. 2 shows the layout of the transducer head over the rail on the installation height h0Fig. 3 - structure of the matrix Converter in the plan.

The device comprises (Fig. 1) generator 1 high frequency, the switch 2, the matrix eddy current Converter 3, consisting of inductors 4, 5,...,n, the amplitude detectors 6, 7,...,n, the joints 8, 9,...,n, the processing circuit 10 of the information signals of the Converter 3, a memory unit 11 and the recorder 12. The generator 1 is connected through a switch 2 to the coils 4, 5,...,n eddy probe 3, the outputs of which are connected with the inputs of the amplitude detectors 6,7,..,n, and the outputs of the detectors are connected with the inputs of the joints 8, 9,...,n. The outputs of the joints 8, 9,...,n are connected to the inputs of the circuit 10, signal processing, and then the information signals into the memory unit 11 and fixed on R 3 is fixed in the switch 2, which connects the coil alternately to the generator 1. The switch 2 is controlled by a reference voltage from a clock generator (Fig. 1-3 not shown). The switching frequency is selected from the conditions of the adequacy of time survey information from each of the coils on the one hand and performance of the survey on the other side, but both depend on the dynamics of the process (speed train).

The Converter 3 is designed to convert the measured parameter into an electrical signal. Structurally, the Converter 3 consists of n overhead coils, placed normal to the tread surface of the rail head. The centers of the winding coils of n combined at one point lying on the Central axis Z-Z of the inverter 3, perpendicular to the surface of the rail. The size of each of n successive coils in the direction of the X-X plane of the cross-section of the rail head, starting from the inner smaller coil transducer 3, is made exceeds the size of the previous coil. The size of the coils in the direction Y-Y of the longitudinal axis of the rail may be different, although to simplify the technology of winding coils and processing of measurement results information of each of the coils n this size size has a different sensitivity to the measured distance to the point, located on the surface of the rail head in the direction of the vertical axis Z-Z, and therefore allows to determine the exact gap to the point of surface wear in the transverse cross section of the rail.

The joints 8, 9,...,n stresses designed to compensate for the level of initial voltages U0i(i=n is the number of coils, expansion joints), corresponding to the voltages on the coils when h0= 10 and in the absence of wear of the rail head. Compensators are blocks collected on operational amplifiers, the input of which is transmitted through the amplitude detectors modulated measured parameters voltage coils 4, 5,. . . ,n, and the second input serves the reference voltages U0from a clock generator (Fig. 1-3 not shown) whose value is set by the value corresponding to the voltages on the coils when h0= 10 mm and no wear. To ensure on the one hand smoothing the pulses caused by the switching, and on the other, the bandwidth of the useful signal with minimal distortion at the output of the compensator is turned on, or the capacity of a certain value, or in the feedback circuit of operational amplifiers included filters.

Schemes is the quiet then fed into the unit 11 storing information, and in the requirements of visual inspection is to recorder 12. As the Registrar may be used a visual device monitor type.

The technical result of the invention can be ensuring the safety of rail transport by improving the information content about the technical condition of the rail of the railroad tracks.

The operation of the device. Converter 3 have normal over the rail. With generator 1 is supplied through the switch 2, which provides a discrete excitation coils of the Converter 3, a high-frequency voltage. When the flow through the inductor of the Converter 3 high frequency currents around each of them creates an electromagnetic field which induces a conductive material controlled rail head eddy currents, causing the rail to the primary electromotive force in the coils - secondary electromotive force. The magnitude of the interaction of primary and secondary electromotive forces is a measure of the measured parameter. Since each of the coils of the transducer 3 has a different size in cross section X-X, the measurement range of the distance to a certain point of the rail head (gap between p the coil. More than n coils, the more it is possible to measure the surface points of wear.

The technical result of the invention is to improve the safety of rail traffic.

Sources of information

1. The device for technical diagnostics of railway track. RF patent N 2066646.

2. Diagnostics of the surface topography of the lateral wear of the rail head. In kN. : Non-destructive testing and diagnostics. So 1. Abstracts by 15 Russian NTC. M., 1999, S. 215.

Device for controlling the surface topography of the wear of the rail head, comprising a generator of high frequency, the switch matrix eddy current transducer, normally placed above the rail head, the amplitude detector inputs connected to the outputs of the Converter, compensators, the inputs of which are connected to the outputs of the detectors, the signal processing unit Converter inputs connected to the outputs of expansion joints, the memory block and the Registrar, characterized in that the Converter is implemented in the form of n inductors, the centers of which are aligned and lie on the Central axis of the transducer perpendicular to the running surface of the rail head, the size of each subsequent n catalyse size of the previous coil, and the number of amplitude detector and compensator are selected respectively equal to the number n of coils.

 

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