The method of determining the magnitude of possible changes to the section length is fixed rail scourge of jointless tracks

 

(57) Abstract:

Usage: used to define possible changes in the length of the plot is fixed rail scourge of jointless tracks influenced by temperature, and a train load. The inventive equalize the temperature of the fixed and unfixed same plots rails, find the value of absolute values of the mechanical stresses in the fixed track section of the scourge. Excite the same ultrasonic pulses in fixed and unfixed sections of the rails, take pulses that have passed through the fixed and unfixed sections of rails, measure the propagation time of a pulse through the respective areas and determine the difference between the propagation velocity of ultrasound in the pinned section of the rail relative to the loose section of rail. 1 Il.

The invention relates to methods for determining the value of possible changes in the length of the plot is fixed rail scourge of jointless tracks influenced by temperature, and a train load and so on, i.e. for the measurement of mechanical stresses in this section of rail scourge of jointless track.

The known method of opredelisja is that equalize the temperature of the fixed section of rail scourge and loose the same with him part of the rail, determine the value of absolute values of the mechanical stresses in the fixed track section of the scourge and hence the magnitude of possible changes in the length of this section (ed. St. USSR N 1710640, CL E 01 35/00, 07.02.1992 ).

The disadvantage of this method is the lack of accuracy of measurements due to the presence of a large number of contacts, as a loose fit any of these contacts will cause additional electrical resistance and affect measurement accuracy.

The technical result of the invention is to improve the accuracy of measurements of the absolute values of mechanical stresses, therefore, determine the magnitude of possible changes in the length of the plot is fixed rail scourge of jointless track.

This result is achieved in that in the method of determining the magnitude of possible changes to the section length is fixed rail scourge of jointless tracks, namely, that equalize the temperature of the fixed section of rail scourge and loose the same with him part of the rail, determine the value absolutego change the length of this section, after a specified temperature compensation excite the same ultrasonic pulses in said fixed and loose parts, determine the rate of passage of impulses through these areas, and the magnitude of absolute values of the mechanical stresses in the fixed track section scourge is determined by the velocity difference of the ultrasonic pulses in said fixed and loose parts.

The drawing shows a diagram of a possible device that implements the method.

The device consists of transducers 2, connected to the generator 1, and the receiving transducers 3 installed on 4 lashing and fixed 5 parts of rails, and receiving transducers 3 are connected to the interferometers 6 and 7 and registrars 8 and 9, by means of which determine the propagation time of ultrasonic waves and, consequently, the speed of ultrasound through a fixed distance in the rails. Data obtained velocities of ultrasound is received in the unit of comparison results 10, and the final result is issued to the fixing unit 11, and this unit can produce any of the required values: the absolute value of the mechanical example is Lisovoy scourge.

The method of determining the magnitude of possible changes to the section length is fixed rail scourge of jointless tracks as follows.

Required to determine the magnitude of possible changes in the length of the particular section of the fixed rail scourge of jointless tracks, for example, for 300 mm For comparison is taken to be the same along the rail, with the ability to change their linear dimensions under the influence of external factors. Aligns the temperature of loose and fixed sections of rails. On the fixed and unfixed sections of rails are installed converters 2 and 3, and the distance between the transducers in fixed and unfixed sections of rails are equal. The generator 1 through the converters 2 are excited identical ultrasonic pulses, which are received by the transducer 3 and in the case of fixed track section scourge mechanical stresses, these pulse transformers 3 will be taken simultaneously, and that will be fixed block comparison results 10 after processing interferometers 6 and 7 and registrars 8 and 9. Determined by the difference of the propagation velocity of ultrasound is using the well known dependence:

< / BR>
where l is the largest possible change in the length of the plot is fixed rail scourge of jointless tracks, mm;

L is the length of the fixed section of the rail, through which is passed an ultrasonic pulse,mm;

the magnitude of the mechanical stresses in the fixed section of the rail, MPa;

E is the modulus of elasticity of rail steel, MPA (E=210000 MPa), it is possible to determine the magnitude of possible changes in the length of the plot is fixed rail scourge of jointless tracks, which will give the unit a final result.

The proposed method of determining the amount of possible changes in the length of the plot is fixed rail scourge of jointless tracks will improve the accuracy of the measurement of absolute values of the mechanical stresses in the fixed track section of the scourge and, therefore, to determine the magnitude of possible changes in its length.

The possibility of a loose section of the rail is free to change their linear dimensions when aligning its temperature with the temperature of the fixed section of rail scourge leads to the fact that the magnitude of the mechanical stresses in the lashing rail, in the absence of exposure to other external factors, at any temperature equal to zero and, sledovat rublennogo sections of rails and distance during which determine the propagation velocity of ultrasound, are equal at the time of measurements, it will allow us to determine the absolute values of the mechanical stresses in the fixed track section of the scourge and, therefore, to determine the exact value of the magnitude of possible changes in the length of the plot is fixed rail scourge of jointless track.

When carrying out the invention the absolute value of the mechanical stresses in fixed track section scourge of jointless tracks is determined by the propagation velocity of ultrasound, and not by electrical resistance.

The method of determining the magnitude of possible changes to the section length is fixed rail scourge of jointless tracks, namely, that equalize the temperature of the fixed section of rail scourge and loose the same with him part of the rail, determine the value of absolute values of the mechanical stresses in the fixed track section of the scourge and hence the magnitude of possible changes in the length of this area, characterized in that after a specified temperature compensation excite the same ultrasonic pulses in said fixed and netgraph mechanical stresses in fixed track section scourge is determined by the velocity difference of the ultrasonic pulses in said fixed and loose parts.

 

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FIELD: railway transport; permanent way facilities.

SUBSTANCE: invention is designed for checking parameters of track. Proposed track gauge contains housing, device for measuring gauge width with movable and fixed stops to thrust against rail heads, rail level measuring device and device to measure ordinates and grooves of switches. Including vernier with stop to thrust against head of move-off rail or counterrail and interacting with digital indicators on gauge housing. Vernier is provided with additional stop to thrust against non-worn-out part of rail head. Rail side wear detector interacting with vernier is installed on gauge housing.

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FIELD: railway transport.

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