RU2162120C1 - Method for determining parameters of rolling surface of rail head - Google Patents

Abstract

FIELD: determination of characteristics of rails, possibly rail grinding processes. SUBSTANCE: method comprises steps of registering readings of pickups for measuring lengthwise and crosswise profiles of rail head and determining fluctuations of those reading values from basic ones; realizing measurements in the same common points of railway track passed successively; according to received data drawing profile curves of rolling surface of rail head with use of mathematical expression relating with pickup readings. EFFECT: enhanced accuracy of parameter determination with use of less number of pickups, possibility for direct measurement in real time. 1 cl, 2 dwg

Description

 The invention relates to methods for determining the profile characteristics of rails and can be used in rail grinding processes.

 The closest analogue of this invention is a method for determining the parameters of the rolling surface of the rail head described by H. Funke "Grinding rails", M., 1992, ss. 47 - 52.

 The known method includes moving along the rail track of the measuring trolley, with longitudinal measurement sensors and measuring sensors of the transverse profiles of the rolling surface of the rail head located along the track axis, the latter being located in a plane perpendicular to the track axis.

 Sensors record the deviation of points on the surface of the rail from the common base of the measuring trolley. The data obtained are used to construct curves characterizing rail profiles.

 Carrying out measurements at regular intervals of time or distance traveled serve as the basis for determining the characteristics of the rail.

 The disadvantage of this method is that the mathematical expressions used to construct the curves do not accurately determine the above characteristics, because they require an increased number of sensors and their specific location, which limits the quality and labor productivity in the process of rail grinding. In addition, the known method does not allow direct measurements in real time, since the measurement data are processed after passing a certain section of the path.

 The objective of the invention is to increase the accuracy of determining the parameters of the rolling surface of the rail head with fewer sensors, as well as the possibility of direct measurements.

Δy^(j)= y $\genfrac{}{}{0ex}{}{\text{(}}{\text{1}}$ ^j)- y $\genfrac{}{}{0ex}{}{\text{(}}{\text{2}}$ ^j) (3)
где x - горизонтальная координата по оси пути;
y - вертикальная координата;
z - горизонтальная координата по оси, перпендикулярной оси пути;
i, j, i' = (0, 1, 2, 3...) - индексы, указывающие номер точки, в которой производилось измерение. Индекс i' численно равен i, но обозначает точки, находящиеся на расстоянии l от точек, обозначаемых индексом i;
Y (x) - отклонение по вертикали кривой продольного профиля рельса от горизонтальной линии;
y₁, y₂ - показания 1-го и 2-го датчиков перемещения;
Y(z) - отклонения по вертикали кривой поперечного профиля рельса относительно оси z горизонтальной плоскости;
Y_s(z) - отклонение по вертикали кривой поперечного профиля рельса относительно базы измерительной тележки, регистрируемое системой измерения поперечного профиля;
l - расстояние между 1-м датчиком перемещения и плоскостью установки датчиков системы измерения поперечного профиля;
m - расстояние между 1-м и 2-м датчиками перемещения.This technical result is achieved by the fact that in the method of determining the parameters of the rolling surface of the rail head, including measuring the parameters by moving along the rail track sensors measuring longitudinal and transverse profiles of the rail head, fixing deviations of the points of the rail surface according to the readings of the sensors from a common base and constructing profile curves the rolling surface of the rail according to the recorded data, the readings of the sensors are fixed at the same points of the path common to them at their sequence passage, while the construction of the curves is carried out according to the formula (1) and / or (2):

Δy ^(j) = y $\genfrac{}{}{0ex}{}{\text{(}}{\text{1}}$ ^j) - y $\genfrac{}{}{0ex}{}{\text{(}}{\text{2}}$ ^j) (3)
where x is the horizontal coordinate along the axis of the path;
y is the vertical coordinate;
z is the horizontal coordinate along the axis perpendicular to the axis of the path;
i, j, i '= (0, 1, 2, 3 ...) - indices indicating the number of the point at which the measurement was made. Index i 'is numerically equal to i, but denotes points located at a distance l from the points indicated by index i;
Y (x) is the vertical deviation of the curve of the longitudinal profile of the rail from the horizontal line;
y ₁ , y ₂ - readings of the 1st and 2nd displacement sensors;
Y (z) - vertical deviations of the curve of the transverse profile of the rail relative to the z axis of the horizontal plane;
Y _s (z) is the vertical deviation of the curve of the transverse profile of the rail relative to the base of the measuring trolley, recorded by the measuring system of the transverse profile;
l is the distance between the 1st displacement sensor and the installation plane of the sensors of the transverse profile measurement system;
m is the distance between the 1st and 2nd displacement sensors.

 The method is illustrated in FIG. 1 and 2 and is carried out as follows. A measuring trolley 9 is moved along the rail track, with two displacement sensors 1 and 2 mounted on it, which fix the vertical deviations of the longitudinal profile of the rail 10. The distance between the sensors 1 and 2 is m, and they are connected to the system 3 for constructing the curves of the longitudinal profile of the rail rolling surface. At a distance l from the sensor 1 (the first in the direction of movement) in a plane perpendicular to the axis of the track, there are sensors 4 of the system 5 for measuring the transverse profile (constructing profile curves) of the rail head.

Before starting the measurements, both sensors 1 and 2 are aligned so that they give the same readings relative to the horizontal line (path axis). This can be done, for example, by adjusting the readings of one of the sensors. Thus, at the 1st point of the path x ₁ (Fig. 2), the vertical deviation of the longitudinal profile from the horizontal line is equal to the sensor 1, thereby determining the ordinate of the zero point vertically, relative to which the remaining points of the longitudinal profile Y ^{(i) are} measured . At the 2nd point of the path x _{2, the} ordinate of the longitudinal profile Y ⁽²⁾ is equal to the reading of the 1st sensor at point x ₂ with correction for the difference in the readings of sensors 1 and 2 at the point of track x ₁ . The difference in the sensor readings physically represents the vertical displacement of the baseline (sensor mounting base), relative to which the sensors are stationary, that occurred when the measuring trolley 9 moved from the way point x ₁ to the point x ₂ , then from x ₂ to x ₃ and so on. Thus, with this measurement method, the displacement of the base is constantly taken into account, which allows direct measurements in real time when moving along a rail track.

In order to ensure that measurements are made by two sensors at the same point x _i , a path sensor 6 is used, which through the former 7 issues commands to systems 3 and 5 to take measurements after the measuring trolley 9 has traveled a distance equal to m. When using a discrete path sensor, increasing the accuracy of this method is achieved by choosing the distance between the sensors when designing a measuring cart multiple of the unit of discretization of the path sensor.

 Accounting for the baseline fluctuations in the measurements of the transverse profile is carried out similarly to the measurements of the longitudinal profile. In this case, the signals from sensors 1 and 2 are fed into the system 5 through matching devices 8, because sensors 4 may differ in principle of operation and output signals of sensors 1 and 2.

Claims (1)

The method of determining the parameters of the rolling surface of the rail head, including measuring the parameters by moving along the rail track of the measurement sensors of the longitudinal and transverse profiles of the rail head and fixing deviations of the points of the rail surface according to the readings of the sensors from the common base, after which the profile curves of the rail rolling surface are constructed according to the recorded data , characterized in that the readings of the sensors are fixed at the same common points for them during their successive passage, and p curves are constructed according to the formulas

Δy ^(j) = y $\genfrac{}{}{0ex}{}{\text{(}}{\text{1}}$ ^j) - y $\genfrac{}{}{0ex}{}{\text{(}}{\text{2}}$ ^j) , (3)
where x is the horizontal coordinate along the axis of the path;
y is the vertical coordinate;
z is the horizontal coordinate along the axis perpendicular to the axis of the path;
i, j, i = (0, 1, 2, 3 ...) - indices indicating the number of the point at which the measurement was made: index i is numerically equal to i, but denotes points located at a distance l from the points indicated by index i ;
Y (x) is the vertical deviation of the curve of the transverse profile of the rail from the horizontal line;
y ₁ , y ₂ - readings of the 1st and 2nd displacement sensors;
Y (z) is the vertical deviation of the curve of the transverse profile of the rail relative to the z axis of the horizontal plane;
Y _s (z) is the vertical deviation of the curve of the transverse profile of the rail relative to the common base, recorded by the measuring system of the transverse profile;
l is the distance between the first displacement sensor and the installation plane of the sensors of the transverse profile measurement system.

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