JP3028686B2 - Method and apparatus for measuring bending of top surface of railroad rail - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for accurately measuring, on-line, the lengthwise unevenness of the upper surface of a rail during table transfer in a railway rail manufacturing line.

[0002]

2. Description of the Related Art Railroad rails are obtained by heating slabs in a heating furnace.
The cross-sectional shape is gradually finished to the shape of a rail by rolling,
It is manufactured by cutting to a predetermined length by sawing, cooling, and then performing bending correction, quenching, and the like. The manufactured rails are mounted on sleepers arranged at regular intervals, and the foot portions of the rails are fixed to the sleepers and laid. Here, if the rail upper surface has a periodic uneven bend, a wheel load fluctuation occurs during running of the vehicle, causing the vehicle to vibrate and adversely affect ride comfort. This has an increasing effect as the speed of the vehicle increases. For this reason, it is required that the amplitude of the periodic uneven bend on the upper surface of the rail during rail manufacture be suppressed to 0.1 mm or less.

[0003] As a method of measuring the unevenness of the rail head upper surface in the longitudinal direction, there is a method for measuring a laid rail in Japanese Patent Publication No.
No. 49365, “Rail top surface shape measuring device”
JP-A-63-177008 discloses a "rail tread unevenness measuring device". In the invention of Japanese Patent Publication No. 3-49365, a gap sensor 57 and an accelerometer 58 are mounted on a trolley 53 that can run on a laying rail 51 as shown in FIG.
The signal from the gap sensor 57 and the signal from the accelerometer 58 while the carriage 53 is running measure the uneven bending in the longitudinal direction of the upper surface of the head of the rail 51.

In the invention of Japanese Patent Application Laid-Open No. 63-177008, as shown in FIG. 14 , a detection vehicle body 65 capable of self-running by a motor 64 is arranged on the upper surface of the rail 61 head. A reference setting unit 68 capable of irradiating a laser slit light to the detection vehicle body 65 is disposed, and when the detection vehicle body 65 runs on the rail 61, a gap sensor 66 mounted on the detection vehicle body 65 and vertical movement of the detection vehicle body 65 are measured. Of the image sensor 67 that receives the laser beam from the reference setting unit 68 for measuring the unevenness of the rail 61 in the longitudinal direction of the upper surface of the head.

[0005]

However, the method disclosed in Japanese Patent Publication No. 3-49365 is intended for measuring a laid rail and cannot be applied to a production line. Further, the method disclosed in Japanese Patent Application Laid-Open No. 63-177008 can be applied to a rail manufacturing line. However, it is necessary to temporarily stop the rail in the rail manufacturing process and attach the measuring device to the rail, which is a great deal of work. Inspection time is required. For this reason, the production efficiency is reduced in a continuously processed production line. In order to carry out an uneven bending inspection in the longitudinal direction of the upper surface of the rail head for all the rails without hindering the efficiency of the manufacturing line, it is necessary to perform online measurement during table transport.
However, there is a problem that when the rail is conveyed on the table, a lateral run-out occurs, and a measurement point shift error occurs due to the curvature in the width direction of the rail head upper surface.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an on-line measuring method for measuring the unevenness of the upper surface of the rail head in the longitudinal direction without being affected by the lateral vibration of the rail during table transfer. And an apparatus.

[0007]

According to a first aspect of the present invention, in a bending measurement of a rail head upper surface in a railroad rail manufacturing line, a rail above a rail parallel to a rail length direction with respect to a rail during table conveyance. Measuring the distance distribution in the width direction of the rail head upper surface at three places, specifying the head vertex of the rail head upper surface from the distance distribution, and calculating the bending of the entire rail length using the distance of the head vertex. It is characterized by.

According to a second aspect of the present invention, there are provided three two-dimensional distance meters which are arranged at equal intervals above the rail in parallel with the length direction of the rail being conveyed and measure the distance distribution in the width direction of the rail head upper surface; Length measuring means for measuring the transport length of the rail, and calculating means for calculating the bending of the entire length of the rail from the data of the two-dimensional distance meter and the data of the length measuring means.

According to a third aspect of the present invention, in the measurement of the curvature of the upper surface of the rail head in a railroad rail manufacturing line, the rail is moved at three places above the rail parallel to the rail length direction with respect to the rail during table transfer. Measure the vertical distance of the upper surface of the head, and measure the horizontal distance to the side of the rail at three places on the side of the rail parallel to the length direction of the rail at the same position as the measurement position of the vertical distance and the rail length direction. From the horizontal distance, determine the amount of lateral deflection during rail transport, determine the amount of error due to the curvature in the width direction of the rail head upper surface from the amount of lateral deflection, and calculate the vertical distance of the rail head upper surface by the error amount The vertical distance of the top vertex of the top of the rail head is calculated by correction, and the bending of the entire rail length is calculated using the vertical distance of the top of the rail.

A fourth aspect of the present invention provides three top rangefinders arranged at equal intervals above the rail in parallel with the length direction of the rail being transported to measure the vertical distance of the top of the rail head. Three side distance meters that are located at the same position in the rail length direction as the top distance meter and are located at three places on the side of the rail parallel to the rail length direction and that measure the horizontal distance to the side of the rail; Length measuring means for measuring the length of rail transport, and calculating means for calculating the bending of the entire length of the rail from the data of the distance meter for the upper surface, the distance meter for the side surface and the length measuring means, Features.

[0011]

[Action] The unevenness of the rail head upper surface length direction is
As shown in FIG. 11 , three distance meters are placed above the rail at an interval of L / 2.
And can be obtained from the measured values of the respective distance meters as follows. In the figure, the unevenness Δ in the length direction of the upper surface of the head of the rail 2 at the position of the distance meter 4b
h is Δh = (ha + hc) / 2−hb (1) where ha is the measured value of the distance meter 4a, hb is the measured value of the distance meter 4b, and hc is the measured value of the distance meter 4c. Next, the uneven bend y (x) in the length direction of the rail head upper surface over the entire length of the rail is represented by: y (x) = Asin2πx where A is an uneven bend amplitude and B is an uneven bend cycle. / Λ−B (2) Here, the distance between the distance meters 4a, 4b, 4c is L /
2. Since each distance measurement value is ha, hb, hc, ha = B-Asin2x / λ (3) hb = B-Asin2π (x + L / 2) / λ (4) hc = B-Asin2π (X + L) / λ (5) When Δh is calculated from the above equations (3), (4), and (5), Δh = (ha + hc) / 2−hb = A (1−cosLπ / λ) · sin2π (x + L / 2) / λ (6) Becomes As is clear from equation (6), Δh is the amplitude A (1
−cosLπ / λ), and can be measured as a waveform having a period λ.
However, since the rail has a curvature in the width direction of the upper surface of the head, an error occurs as shown in FIG. 12 when the measurement point from the upper part of the rail deviates from the center in the rail width direction.

Therefore, in the present invention, as shown in FIG. 9 , the three rangefinders at the upper part of the rail in FIG. 11 convert the laser beam light from the laser oscillator into slit light with a cylindrical lens and convert this into parallel light with a lens. The light is irradiated in the width direction of the top of the rail head, the reflected light is received by a two-dimensional image sensor, and the distance distribution on the reflection line of the slit light irradiated in the width direction of the top of the rail head can be measured. The two-dimensional distance meter measures the distance distribution in the width direction of the top surface of the rail head, and identifies the top of the rail by adopting the minimum distance value from the distance distribution. That is,
A two-dimensional distance meter is placed on a rail conveyance table, a profile of the rail head upper surface width direction having a curvature is measured by the two-dimensional distance meter, the top of the rail is identified from this profile, and a distance measurement value at a specific point is measured. Measure the uneven bend in the longitudinal direction from the top of the rail head. The slit light irradiated on the rail head top surface width direction, as in FIG. 10, the laser beam from the laser oscillator is vibrated at a rotating mirror of the polyhedron, it can be realized by the parallel light by the lens.

Further, the three upper distance meters at the upper part of the rail in FIG. 11 are arranged so as to measure the center line of the rail in the width direction of the transport line, and are arranged at the same position as the upper distance meter in the rail length direction. From the horizontal distance to the side of the rail measured by the side finder, the amount of deviation from the top of the rail due to the lateral deflection of the rail when the rail is conveyed is calculated. Then, the distance value of the top of the rail is calculated by correcting the distance value of the top surface distance meter with the error amount, and the unevenness of the top surface of the rail head in the length direction is measured.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the first and second inventions will be described with reference to the drawings. FIG. 1 is a configuration diagram of a bending measuring apparatus according to the present invention. In FIG. 1, 1a and 1b are transport rolls, 2 is a rail, 3 is a detector frame, 4a, 4b and 4c are two-dimensional rangefinders, 6a and 6b are passage detectors, 7 is a touch roller, 8 is a pulse generator, 9 is an arithmetic unit, 10 is a recorder, and 11 is a printer. 2D distance meter 4a, 4
b and 4c are arranged above the rail 2 in parallel with the length direction of the rail 2 and are arranged on the detector frame 3 at an interval of L / 2. The two-dimensional distance meters 4a and 4c are attached to slide mechanisms 5a and 5b mounted on the detector frame 3, and the two-dimensional distance meters 4a-4b and 4b-4c are provided.
Can be changed centering on the two-dimensional distance meter 4b. The passage detector 6a outputs a material presence signal when the tip of the rail 2 passes the measurement position of the two-dimensional distance meter 4a, and the passage detector 6b measures the rear end of the rail 2 by the two-dimensional distance meter 4c. Until it passes through the position, it outputs the presence signal.

The touch roller 7 rotates in contact with the sole of the rail 2 and transmits the rotation to the panel generator 8. The circumference of the touch roller 7 is, for example, 250 mm, and the rail 2 is conveyed by 250 mm. One rotation when done. The pulse generator 8 outputs a pulse signal by the rotation of the touch roller 7, and outputs, for example, 250 pulses per rotation. Therefore, in this example, the rail 2 is 1 m
An output of one pulse is obtained every m transports. The arithmetic unit 9 calculates the unevenness in the length direction of the top surface of the rail 2 based on the distance distribution data in the width direction of the top surface of the rail 2 of the two-dimensional rangefinders 4a, 4b, and 4c and the pulse signal of the pulse generator 8. The amount is calculated, the result is output to the recorder 10, and the pass / fail judgment of the bending over the entire length of the rail 2 is performed.

Next, the rail bending measurement processing according to the above configuration will be described with reference to the flowchart shown in FIG.
When the rail 2 is transported on the transport rolls 1a and 1b in the direction of arrow J and the tip of the rail 2 is detected by the passage detector 6a (S1), the arithmetic unit 9 causes the two-dimensional rangefinders 4a, 4b and 4 to move.
The distance distribution from the top of the rail 2 in the width direction of the upper surface of the head of the rail 2 and the data of the pulse generator 8 are started (S
2). From the distance distribution of the two-dimensional distance meters 4a, 4b, 4c in the width direction of the top surface of the rail 2, the top vertex P of the rail 2 is obtained.
a, Pb, and Pc are specified (S3), and the three specific points P
The bend amount of the rail 2 is calculated from the distance values at a, Pb, and Pc (S4) and output to the recorder 10 (S5). Further, the transport distance from the tip of the rail 2 is calculated based on the pulse signal of the pulse generator 8, and the bending amount and the transport distance value are stored in a storage unit (not shown) (S6). The above processing is repeated until the passage detector 6b detects the rear end of the rail 2 (S7). When the passage detector 6b detects the rear end of the rail 2 (S8), the arithmetic unit 9 sets the two-dimensional distance meter 4
a, 4b, and 4c, the distance distribution in the width direction of the top surface of the head of the rail 2 and the data acquisition of the pulse generator 8 are stopped, and the bend period and the bend cycle over the entire length of the rail 2 are obtained from the stored bend amount and transport distance value. The amplitude is calculated (S9).
Then, the pass / fail judgment is made by comparing with the preset cycle and amplitude judgment values (S10), and the result is output to the printer 11 (S11).

FIG. 3 is a block diagram showing a functional configuration of the arithmetic unit 9. When the leading end detection signal of the rail 2 of the passage detector 6a is input to the interrupt input processing unit 91, the calculation determination processing unit 97 initializes the counter 96 and the data buffer 98, and then starts the measurement processing. Transmission processing units 93, 94, 9
In 5, a reading signal of the measurement data of the two-dimensional rangefinders 4 a, 4 b, and 4 c is issued from the calculation determination processing unit 97 by the timing signal of the synchronization unit 90, and the two-dimensional rangefinders 4 a and 4 c are read.
4b, 4c, and receives the measurement data,
Send to 7. At the same time, the calculation determination processing unit 97 reads the count value of the counter 96 that stores the cumulative value of the number of pulses of the pulse generator 8 immediately after the start of the measurement.
Then, from the distance distribution measurement data in the head upper surface width direction of the rail 2 from the transmission processing units 93, 94, and 95, the minimum distance value is extracted as a distance measurement value at the head vertex of the rail 2, and the distance at the head vertex is extracted. Calculate the amount of bending from the value. The calculation result is sent to the output unit 100, converted into an analog signal, and output to the recorder 10. In addition, the calculation determination processing unit 97 converts the count value read from the counter 96 into the transport distance of the rail 2 and stores the transport distance value and the amount of bending in the data buffer 98. The above-described measurement process is performed for each of the timing signals output from the synchronization unit 90 by the rear-end detection signal of the rail 2 of the passage detector 6b.
Repeat until 2 is entered.

When the rear end detection signal of the rail 2 of the passage detector 6b is input to the interrupt input processing unit 92, the calculation judgment processing unit 97 terminates the measurement processing and starts the judgment processing of the total length of the rail 2. . In the above-described measurement processing, the data buffer 98 stores the amount of bending for each transport distance over the entire length of the rail 2, and the arithmetic determination processing unit 97 reads the amount of bending for each transport distance, and calculates the amount of bending over the entire length of the rail 2. Calculate the period and amplitude. Further, a pass / fail judgment is made by comparing the values with the judgment values of the bending period and the amplitude stored in the setting unit 99 in advance, and the calculation result of the bending period and the amplitude and the result of the pass / fail judgment are sent to the output unit 100. To the printer 11.

Next, embodiments of the third and fourth inventions will be described with reference to the drawings. 4 to 6 are configuration diagrams of the rail bending measuring apparatus of the present invention. FIG. 4 is a perspective view, FIG. 5 is a device layout view as viewed from a cross-sectional direction of a rail during conveyance, and FIG. 6 is a configuration diagram of an electric system. In FIG. 4, 1a and 1b are transport rolls, 2 is a rail, 23 is an upper detector frame, 24
a, 24b, 24c are distance meters for the upper surface, 25a, 25b are sliding mechanisms, 26 is a detector frame for the side surface, 27a,
Reference numerals 27b and 27c denote side distance meters, and reference numerals 28a and 28b denote slide mechanisms. In FIG. 5, 29a, 29b and 30
Reference numerals a and 30b denote a pair of a light emitter and a light receiver for detecting passage, 31 a touch roller, and 32 a pulse generator. In FIG. 6, 33 is an arithmetic unit, 34 is a recorder, and 35 is a printer.

The distance meters 24a, 24b, 24c for the upper surface are:
The detector frame 23 for the upper surface is set at a position above the rail 2 parallel to the length direction of the rail 2 and at a position where the measurement can be performed on the center line in the width direction of the rail transport line, with each interval being L / 2.
Is placed on top. Further, the distance meters 24a, 24 for the upper surface are used.
c is a slide mechanism 25 mounted on the detector frame 23
a, 25b, and a distance meter for top surface 24a-24b
And the distance L / 2 between 24b and 24c is the distance meter 24 for the upper surface.
It can be changed around b. The side finder 27a, 27b,
Numerals 27c are arranged on the detector frame 26 for the side surface at an interval of L / 2. The distance meter 27a for the side surface is a distance meter 24a for the upper surface, and the distance meter 27b for the side surface is a distance meter 24b for the upper surface.
And the side rangefinder 27c is disposed on the side surface of the rail 2 in parallel with the length direction of the rail 2 such that the rangefinder 27c is located at the same position in the length direction of the rail 2 as the rangefinder 24c for the upper surface. Further, the side distance meters 27a, 27c are attached to slide mechanisms 28a, 28b mounted on the side detector 26 frame, and the side distance meters 27a-27b and 27b-27c.
Can be changed centering on the side distance meter 27b. The light projector 29a and the light receiver 29b for passage detection use the distance meter 24a for the upper surface and the distance meter 27a for the side surface,
When the leading end of the rail 2 passes, it outputs a signal indicating that there is a material. The light emitting device 30a and the light receiving device 30b for detecting passage are arranged such that the rear end of the rail 2 has an upper surface distance meter 24c and a side surface distance meter 2c.
It outputs the presence signal until it passes the measurement position 7c.

The touch roller 31 rotates in contact with the sole of the rail 2 and transmits the rotation to the pulse generator 32. The circumference of the touch roller 31 is, for example, 250.
mm, the rail 2 rotates once when the rail 2 is conveyed by 250 mm. The pulse generator 32 outputs a pulse signal by the rotation of the touch roller 31,
For example, 250 pulses per rotation are output. Therefore, in the case of this example, an output of one pulse is obtained every time the rail 2 is conveyed by 1 mm. The arithmetic unit 33 includes the upper surface distance meter 24a, 2
From the distance data on the top surface of the rail 2 at 4b and 24c, the distance data on the abdomen side surface of the rail 2 at the side distance meters 27a, 27b and 27c, and the pulse signal from the pulse generator 32, the top surface length of the rail 2 is obtained. The direction of the curve is calculated, the result is output to the recorder 34, and the pass / fail of the curve over the entire length of the rail 2 is determined.

Next, the rail bending measurement processing according to the above configuration will be described with reference to the flowchart shown in FIG. Rail 2
Is transported on the transport rolls 1a and 1b in the direction of arrow J,
When the leading end of the rail 2 is detected by the passage detecting light receiver 29b (S21), the calculator 33 sets the distance meters 24a, 24 for the upper surface.
The acquisition of the distance of the upper surface of the head of the rail 2 by b and 24c, the distance data of the abdominal side of the rail 2 by the side distance meters 27a, 27b and 27c, and the data of the pulse generator 32 are started (S22). Then, the lateral run-out amount at the time of conveyance of the rail 2 is obtained from the distance measurement value of the side rangefinder 27a, and from the lateral run-out amount, the upper surface width direction of the rail 2 of the upper surface rangefinder 24a with respect to the top vertex Pa of the rail 2 The deviation amount of the distance measurement point is calculated. Further, the distance measurement value of the upper surface of the head of the rail 2 of the distance meter 24a for the upper surface is calculated from the deviation amount,
The distance measurement value at the head vertex Pa is corrected using the curvature of the rail 2 in the width direction of the head upper surface. The above processing is also performed on the distance measurement values of the distance meters 24b and 24c for the upper surface (S
23). The bend amount of the rail 2 is calculated from the distance values at these head vertices Pa, Pb, and Pc (S24), and the bend amount is output to the recorder 34 (S25). Is calculated, and the bending amount and the transport distance value are stored in a storage unit (not shown) (S26). The above process is repeated until the passage detection light receiver 30b detects the rear end of the rail 2 (S27).

When the passage detecting light receiver 30b detects the rear end of the rail 2 (S28), the arithmetic unit 33 causes the upper surface distance meter 2
4a, 24b, and 24c, the distance data on the upper surface of the head of the rail 2, and the side 2 of the distance meter 27a, 27b, 27c.
The acquisition of the distance data on the side surface of the abdomen and the data of the pulse generator 32 is stopped, and the period and amplitude of the bending over the entire length of the rail 2 are calculated from the stored bending amount and the transport distance value (S29). Then, the pass / fail judgment is made by comparing with the cycle and amplitude judgment values set in advance (S30), and the result is output to the printer 35 (S3).
1).

FIG. 8 is a block diagram showing a functional configuration of the arithmetic unit 33. Rail 2 by light detector 29b for passage detection
Is input to the interrupt input processing unit 131, the arithmetic determination processing unit 140 initializes the counter 139 and the data buffer 141, and then starts the measurement processing.
In response to a timing signal from the synchronization unit 130, a command to read distance measurement data on the top surface of the head of the rail 2 of the top rangefinders 24a, 24b, and 24c is transmitted from the operation determination processing unit 140 to the transmission processing units 133, 134, and 135. Processing unit 1
36, 137, and 138 have side finder 27a, 27b,
An instruction to read the distance measurement data on the side surface of the abdomen of the rail 2 at 27c is issued, and the transmission processing units 133 to 138 transmit the upper surface distance meters 24a, 24b, 24c and the side distance meters 27a,
The measurement data of 27b and 27c is received, and this is sent to the calculation determination processing unit 140. At the same time, the arithmetic judgment
Reads the count value of the counter 139 of the pulse generator 32 which stores the accumulated value of the number of pulses immediately after the start of measurement.

Next, the amount of lateral vibration of the rail 2 at the time of conveyance is obtained from the distance measurement value of the side distance meter 27a, and the thickness of the abdominal part of the rail 2 previously set in the setting unit 142 is calculated from the amount of lateral vibration. By subtracting / 2, the shift amount of the distance measurement point in the width direction of the upper surface of the head of the rail 2 of the upper surface distance meter 24a with respect to the vertex Pa of the rail 2 is obtained. From this deviation amount, the distance meter 2 for the upper surface
The distance measurement value of the upper surface of the head of the rail 2 of 4a is corrected using the curvature in the width direction of the upper surface of the head of the rail 2 set in the setting unit 142 in advance, and the distance measurement value at the head vertex Pa is calculated. . The above processing is performed by using the distance meters 24a and 24b for the upper surface.
The distance measurement value of the upper surface distance meter 24b is a deviation amount due to the distance measurement value of the side distance meter 27b, and the distance measurement value of the upper surface distance meter 24c is the distance measurement value of the side distance meter 27c. Correct each with the amount of deviation according to the value,
The distance measurement value at the head vertices Pb and Pc of the rail 2 is calculated. Then, the amount of bending is calculated from the distance values at these head vertices Pa, Pb, and Pc. The calculation result is sent to the output unit 143, converted into an analog signal, and recorded by the recorder 34.
Is output to At the same time, the operation determination processing unit 140 converts the count value read from the counter 139 into the transport distance of the rail 2 and stores the transport distance value and the amount of bending of the rail 2 in the data buffer 141. The above measurement process
For each timing signal output from the synchronization unit 130, the rear end detection signal of the rail 2 by the passage detection light receiver 30b is
The process is repeated until an input is made to the interrupt input processing unit 132.

When a rear end detection signal of the rail 2 by the passage detection light receiver 30b is input to the interrupt input processing unit 132, the calculation judgment processing unit 140 terminates the measurement processing and performs the judgment processing of the total length of the rail 2. Start. In the above-described measurement process, the data buffer 141 stores the amount of bending for each transport distance over the entire length of the rail 2, and
A value of 0 reads the amount of bending for each transport distance over the entire length of the rail 2 and calculates the bending period and amplitude. Then, the pass / fail judgment is made by comparing with the judgment values of the bending period and the amplitude stored in the setting unit 142 in advance, and the result is sent to the output unit 143 and output to the printer 35.

[0027]

According to the first and second aspects of the present invention, the unevenness in the length direction of the upper surface of the head of the rail during table transfer on the rail manufacturing line can be measured using a two-dimensional distance meter. Since the measurement is performed by specifying the top of the head, a measurement error due to a lateral shake during conveyance can be reduced. Therefore, accurate and highly reliable on-line bending inspection can be performed, and 100% inspection can be easily performed without lowering the efficiency of the production line, thereby improving the rail shape quality.

According to the third and fourth aspects of the present invention, the measurement of the uneven bending in the length direction of the upper surface of the head of the rail during table transfer on the rail manufacturing line is performed based on the measured value of the side distance meter. To determine the amount of lateral shake, and to correct the measured value with the distance meter for the top surface from the amount of lateral shake, and to perform with the corrected distance value,
It is possible to prevent the occurrence of an error due to the lateral shake during the conveyance. Therefore, accurate and highly reliable on-line bending inspection can be performed, and 100% inspection can be easily performed without lowering the efficiency of the production line, thereby improving the rail shape quality. Further, the apparatus can be configured by a combination of inexpensive devices, and the equipment cost at the time of introduction can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of the first and second inventions.

FIG. 2 is a flowchart showing a rail bending measurement process of the first and second inventions.

FIG. 3 is a block diagram of the arithmetic device of FIG. 1;

FIG. 4 is a configuration diagram showing an embodiment of the third and fourth inventions.

FIG. 5 is an arrangement plan of the third and fourth inventions as viewed from the cross-sectional direction of the rail.

FIG. 6 is a configuration diagram of an electric system according to third and fourth inventions.

FIG. 7 is a flowchart showing a rail bending measurement process according to the third and fourth inventions.

FIG. 8 is a block diagram of the arithmetic device of FIG. 6;

FIG. 9 is an explanatory diagram of a two-dimensional distance meter.

FIG. 10 is an explanatory diagram of a two-dimensional distance meter.

FIG. 11 is an explanatory view of bending of the upper surface of a rail head for a railway.

FIG. 12 is a diagram illustrating the relationship between the amount of lateral deflection of the rail and the measurement error of the bending of the upper surface of the head.

FIG. 13 shows a conventional bending measuring device for a railroad rail head upper surface.

FIG. 14 shows a conventional bending measuring device for the upper surface of a railway rail head.

[Explanation of symbols]

 1a, 1b Transport Roller 2 Rails 4a, 4b, 4c Two-Dimensional Distance Meter 6a, 6b Passage Detector 7 Touch Roller 8 Pulse Generator 9 Arithmetic Units 24a, 24b, 24c Upper Distance Meter 27a, 27b, 27c Side Distance Meter 29a , 30a Passage detecting light emitter 29b, 30b Passage detecting light receiver 31 Touch roller 32 Pulse generator 33 Arithmetic unit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-51-12154 (JP, A) JP-A-55-48603 (JP, A) JP-A-49-133647 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) G01B 21/20

Claims (4)

(57) [Claims] In a bending measurement of a rail head upper surface in a railroad rail manufacturing line, a rail head upper surface width is set at three places above a rail parallel to a rail length direction with respect to a rail during table conveyance. Measuring the distance distribution in the direction, identifying the top of the top of the rail head from the distance distribution, and performing the bending calculation of the entire length of the rail using the distance of the top of the rail. Bending measurement method. 2. A two-dimensional distance meter arranged parallel to the length direction of the rail being transported and at equal intervals above the rail to measure the distance distribution in the width direction of the rail head upper surface, and the rail transport length. Measuring means for measuring the length of the rail, and calculating means for calculating the bending of the entire length of the rail from the data of the two-dimensional distance meter and the data of the length measuring means. Bending measuring device. 3. In the bending measurement of the rail head upper surface in the rail manufacturing line for railroad, the upper surface of the rail head is located at three places above the rail parallel to the length direction of the rail with respect to the rail during table transfer. Measuring the vertical distance, measuring the horizontal distance to the rail side surface at three positions on the side of the rail parallel to the length direction of the rail at the same position as the measurement position of the vertical distance and the rail length direction, The horizontal run-out amount during rail conveyance is obtained from the horizontal distance, the error amount due to the curvature in the width direction of the rail head upper surface is obtained from the horizontal run-out amount, and the vertical distance of the rail head upper surface is corrected by the error amount. A method for measuring the curvature of the top surface of a railway rail head, comprising calculating a vertical distance of a top vertex of the top surface of the head and calculating a curvature of the entire length of the rail using the vertical distance of the top vertex. 4. A distance meter for upper surface which is arranged at equal intervals above the rail in parallel with the length direction of the rail being transported and measures the vertical distance of the upper surface of the rail head, and a distance meter for upper surface. And three side distance meters for measuring the horizontal distance to the side of the rail, which are arranged at three places on the side of the rail parallel to the length of the rail and at the same position in the length direction of the rail, and transport of the rail A railway comprising: a length measuring means for measuring the length; and a calculating means for calculating a bend of the entire length of the rail from each data of the distance meter for the upper surface, the distance meter for the side surface and the length measuring means. For measuring the bending of the top of the rail head.