Orbit Pad Protrusion Amount Abnormality Detection System and Abnormality Detection Method

Abstract

To provide a track pad protrusion amount abnormality detection system capable of reducing the number of track pads to be repaired and reducing the burden of repair work.SOLUTION: In an abnormality detection system that detects abnormalities in a track pad protrusion amount based on collected image data and temperature data, an abnormality detection device includes: means for image-processing image data collected by an image collecting device to calculate the movement amount of a track pad; storage means for storing a track loop line serving as preset criterion based on track lines showing information about the position of a detection object rail movable section and a plurality of track pad movement amounts in a prescribed period in chronological order on coordinates with temperature and movement amount as the coordinate axes; and movement amount determination means for determining whether the track pad movement amount in the rail movable section is outside a reference track loop line. An abnormality is output when the track pad movement amount in the rail movable section is determined to be outside the track loop line that serves as a determination reference.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a track pad protrusion amount abnormality detection system and an abnormality detection method for detecting an abnormality in the protrusion amount of a track pad installed under a rail of a railway track.

Background Art

[0002] Conventionally, in a slab track, in order to slide a rail laid along the track in accordance with the expansion and contraction of the rail, a track pad with a steel plate (hereinafter simply referred to as a track pad) is installed under the rail. Such a track pad may shift and come off in the longitudinal direction of the rail due to repeated expansion and contraction of the rail. Therefore, a track pad protrusion amount measuring device for measuring the protrusion amount of the track pad has been proposed (see, for example, Patent Document 1).

[0003] The track pad protrusion amount measuring device described in Patent Document 1 includes a position detection unit that detects the installation position of the track pad by detecting components other than the track pad (such as fastening bolts) that constitute the fastening portion of the rail, and a photographing unit that photographs an image of the fastening portion of one rail from the side of the other rail. The photographing unit is controlled in synchronization with the output of the position detection unit to take an image, and the image is processed to calculate the protrusion amount of the track pad, thereby measuring the protrusion amount of the track pad in a state where it is displaced in the longitudinal direction of the rail.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Conventionally, in the maintenance management of track pads, when the amount of protrusion measured by the above-described track pad protrusion measuring device exceeds a preset value, a repair operation is uniformly performed. By doing so, regular repairs become unnecessary and repairs can be made according to the condition. However, in the method of determining and repairing when the amount of protrusion is abnormal under the same conditions as described above, it is necessary to set a low judgment criterion (threshold value) in order to ensure safety. Therefore, there has been a problem that the number of track pads determined to be repair targets increases and the burden of repair work becomes large.

[0006] The present invention has been made in view of the above problems, and an object thereof is to reduce the number of track pads to be repaired without overlooking objects that really need repair and reduce the burden of repair work. An object of the present invention is to provide a track pad protrusion amount abnormality detection system and an abnormality detection method. Another object of the present invention is to provide a track pad protrusion amount abnormality detection system and an abnormality detection method capable of distinguishing and detecting an abnormality that requires a major repair such as alignment or replacement of the position of the track pad from an abnormality that can be repaired by a relatively simple repair operation such as adjustment of the rail fastening device.

Means for Solving the Problems

[0007] Prior to the present invention, the inventors of the present invention did not repair those track pads whose protrusion amount was equal to or greater than the management value under the same conditions in the entire section, but determined under different conditions according to the track condition, environment, etc. In order to verify whether the track pads can be efficiently managed and repaired, the number of occurrences of track pad displacements detected in a certain section over the past two years was investigated. Then, the number of occurrences of pad displacements per 100 m of the rail obtained by the investigation was represented by a graph shown in Fig. 4(A).

[0008] As a result, it was found that the displacement of the track pads was concentrated in a predetermined section. Therefore, we investigated what locations the sections with a large number of occurrences and the sections with a small number of occurrences were respectively. As a result, as shown in Fig. 4(B), the section with a large number of occurrences is a long rail movable section where expansion joints are interposed and the rail expands and contracts with temperature changes, and the section with a small number of occurrences is a long rail immovable section where the rail axial force and the longitudinal track resistance are in balance and the rail does not expand and contract. It was also found that the section with a very small number of occurrences was a tunnel section. Regarding the fastening device for expansion joints, for example, there is an invention described in Japanese Patent Application Laid-Open No. 2020-16010.

[0009] Therefore, in order to know in detail the phenomenon occurring in the rail movable section, the movement amounts of the rail and the track pad at the point where the expansion joint is provided were investigated over several months together with the rail temperature. The movement amounts of the rail and the pad were calculated from the number of pixels by processing images taken at a predetermined time every few weeks with a camera installed under the vehicle, and the rail temperature was measured with a non-contact thermometer for the rail temperature near the expansion joint which is the location to be investigated. Also, the temperature measured by the temperature measuring device for the rail temperature that has already been installed at a predetermined interval along the rail and is closest to the movement amount measurement location was obtained for reference. The results are shown in Figs. 5 and 6.

[0010] The graphs in Figs. 5(A), (B) and 6 represent the results of measuring the absolute movement amounts of the "rail" and "track pad" in three different rail movable sections respectively. The horizontal axis of the graph shows the rail temperature arranged in time series, and the vertical axis shows the measured movement amount. Also, the bar graph represents the pad movement amount and the line graph represents the rail movement amount. From Figs. 5 and 6, it can be seen that the movement of the pad almost coincides with the movement of the rail. Also, it can be seen that the movement of the rail is related to the temperature. Regarding the method of calculating the movement amount of the track pad from the number of pixels by processing the images taken with the camera installed under the vehicle, for example, it is described in the aforementioned Patent Document 1, and a similar method can be used.

[0011] Next, the inventors plotted the measured rail movement amount on the horizontal axis and the temperature on the vertical axis, and the vertical axis shows the track pad movement amount, and then connected the points in chronological order to illustrate the variation locus. The result is shown in Fig. 7. Note that Fig. 7 is based on the measured values for approximately nine months from the beginning of winter to the end of summer, and each locus line A, B, C represents the variation locus of the measured values at different locations. As can be seen from Fig. 7, the variation locus of the pad movement amount is similar to a hysteresis curve. The reason why the variation locus of the pad movement amount shows hysteresis characteristics is that the track pad moves according to the expansion and contraction of the rail. The amount of expansion of the rail gradually increases from spring to summer and gradually contracts from autumn to winter.

[0012] Then, as the rail expands, the track pad below it moves in the positive direction, and as the rail contracts, the track pad moves in the negative direction. It moves continuously in each direction and reaches the maximum in summer or winter. Immediately after starting to move in the reverse direction due to the reversal of the temperature change, the moving speed becomes fast, and then the moving speed gradually slows down. According to such a concept, in the missing part of each locus line A, B, C shown in Fig. 7, that is, in the period (autumn) when there are no measured values, it can be estimated that it changes generally along the line connecting the starting point and the ending point, that is, it changes along a loop line similar to a hysteresis curve as a whole.

[0013] Also, from the graph in Fig. 7, for example, the movement amount of locus line A increases up to a maximum of 40 mm, but then turns to decrease and decreases to the same level as the other locus lines B and C. It can be estimated that it only repeats the increase and decrease due to the installation conditions and seasonal factors, and does not show particularly abnormal movement. However, with the abnormal determination using the conventional upper limit value (for example, 30 mm), such a track pad would be determined to be abnormal, leading to a situation of performing unnecessary repair work.

[0014] On the one hand, as a result of the verification conducted by the present inventors, it was revealed that when the track pad to be detected is a pad in the rail movable section, such behavior is exhibited. Therefore, with regard to such a track pad, it was found that by setting the upper limit value to a value larger than the conventional value (for example, 41 mm), it can be excluded from the target of repair work.

[0015] The present invention has been made based on the above findings, and in order to achieve the above problems, In a track pad protrusion amount abnormality detection system including an image collection device that collects data of an image taken while traveling in the vicinity of a rail by an imaging device mounted on a vehicle, a rail temperature collection device that measures the temperature of each part of the rail along the longitudinal direction of the rail and collects rail temperature data, and an abnormality detection device that detects an abnormality in the protrusion amount of the track pad based on the image data collected by the image collection device and the temperature data collected by the rail temperature collection device, The abnormality detection device Movement amount calculation means for performing image processing on the image data collected by the image collection device to calculate the movement amount of the track pad, Storage means for storing a trajectory loop line that is a preset determination criterion based on information on the position of the rail movable section to be detected and a plurality of movement amounts of the track pad in a predetermined period obtained from the movement amount calculation means, where the temperature and the movement amount are plotted in time series on a coordinate with the coordinate axes, Movement amount determination means for determining whether the movement amount of the track pad in the rail movable section obtained from the movement amount calculation means is outside or inside the trajectory loop line serving as the reference, Section determination means for determining whether the track pad included in the image to be determined is in the rail movable section or the rail immovable section, and has The movement amount determination means is configured to output an abnormality when it determines that the movement amount obtained from the movement amount calculation means is outside the trajectory loop line serving as the determination criterion for the track pad determined to be in the rail movable section by the section determination means.

[0016] According to the track pad protrusion amount abnormality detection system having the above configuration, when it is determined that the movement amount of the track pad determined to be in the rail movable section is outside the trajectory loop line serving as the determination criterion, an abnormality is output. Therefore, an abnormality can be detected based on a criterion different from the abnormality determination criterion for the movement amount of the track pad in the rail fixed section, thereby reducing the number of track pads to be repaired without missing a target that truly requires repair and reducing the burden of the repair work.

[0017] Also, preferably, the storage means stores an upper limit value of the protrusion amount of the track pad. When the movement amount determination means determines that the movement amount of the track pad obtained from the movement amount calculation means is outside the trajectory loop line serving as the reference and exceeds the upper limit value, it outputs as a first abnormal state. The movement amount determination means is configured to output as a second abnormal state when it determines that the movement amount of the track pad obtained from the movement amount calculation means is outside the trajectory loop line serving as the reference and does not exceed the upper limit value. According to such a configuration, it is possible to distinguish and detect an abnormality that requires a major repair operation such as correction or replacement of the position of the track pad, and an abnormality that can be repaired by a relatively simple repair operation such as adjustment of the rail fastening device.

[0018] Furthermore, preferably, the movement amount determination means is configured to output an abnormality when it determines that the movement amount obtained from the movement amount calculation means exceeds a predetermined threshold value smaller than the upper limit value for the track pad determined to be in the rail fixed section by the section determination means. According to such a configuration, for the track pad in the rail fixed section, an abnormality can be detected according to the same abnormality determination criterion as in the prior art, so that consistent maintenance management of the track pad can be realized.

[0019] Also, the track pad protrusion amount abnormality detection method having a configuration according to another invention of the present application is In an abnormal detection method for the amount of protrusion of a track pad that collects data of an image obtained by photographing the vicinity of a rail by an imaging device while traveling on a vehicle and data of the temperature of each part of the rail along the longitudinal direction of the rail, and detects an abnormality in the amount of protrusion of the track pad based on the collected image data and temperature data, a step of collecting the image data and the temperature data obtained by photographing the vicinity of the rail in a rail movable section to be detected at predetermined intervals over at least a six-month predetermined period a plurality of times; a step of performing image processing on the collected image data of the rail movable section to calculate the amount of movement of the track pad, and setting a reference locus loop line in advance for each rail movable section based on a locus line obtained by chronologically representing a plurality of amounts of movement of the track pad in the predetermined period on a coordinate having temperature and the amount of movement as coordinate axes; a step of performing image processing on the image data of the vicinity of the rail photographed by the imaging device mounted on the vehicle to calculate the amount of movement of the track pad; a step of determining in which rail movable section the track pad included in the image to be determined is located; a step of determining whether the amount of movement calculated for the track pad in the rail movable section is outside or inside the locus loop line set corresponding to the track pad, and outputting an abnormality when the amount of movement is outside the locus loop line; It is configured to have the above steps.

[0020] According to the abnormal detection method for the amount of protrusion of the track pad having the above steps, when it is determined that the amount of movement of the track pad determined to be in the rail movable section is outside the locus loop line serving as the determination reference, an abnormality is output. Therefore, an abnormality can be detected based on a criterion different from the abnormality determination criterion for the amount of movement of the track pad in the rail fixed section, thereby reducing the number of track pads to be repaired without overlooking a truly necessary repair target and reducing the burden of the repair work.

[0021] Also, preferably, when it is determined that the amount of movement calculated for the track pad in the rail movable section is outside the trajectory loop line set corresponding to the track pad and exceeds the upper limit value of the preset amount of protrusion of the track pad, it is output as a first abnormal state. When it is determined that the amount of movement calculated for the track pad in the rail movable section is outside the trajectory loop line set corresponding to the track pad and does not exceed the upper limit value, it is output as a second abnormal state. According to such a method, it is possible to distinguish and detect an abnormality that requires a major repair work such as correction or replacement of the position of the track pad, and an abnormality that can be repaired by a relatively simple repair work such as adjustment of the rail fastening device.

[0022] Furthermore, preferably, the predetermined period is 9 months or more. The trajectory loop line is a parallelogram that circumscribes a trajectory line obtained by chronologically representing a plurality of movement amounts of the track pad during the predetermined period on a coordinate with temperature and movement amount as coordinate axes. According to such a method, it is possible to set a trajectory loop line as a determination criterion that can obtain relatively efficient and good abnormality detection accuracy.

Advantages of the Invention

[0023] According to the track pad protrusion amount abnormality detection system and the abnormality detection method according to the present invention, the number of track pads to be repaired can be reduced, and the burden of repair work can be reduced. In addition, there is an effect that it is possible to distinguish and detect an abnormality that requires a major repair such as alignment or replacement of the position of the track pad, and an abnormality that can be repaired by a relatively simple repair work such as adjustment of the rail fastening device.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0025] Hereinafter, with reference to the drawings, a track pad protrusion amount abnormality detection system and an abnormality detection method according to an embodiment of the present invention will be described in detail. First, with reference to FIG. 1, an embodiment of the track pad protrusion amount abnormality detection system of the present invention will be described. FIG. 1 is a schematic configuration diagram showing the abnormality detection system as a functional block diagram.

[0026] As shown in Fig. 1, the abnormal detection system for the amount of protrusion of the track pad according to this embodiment includes a control device 11 mounted on a vehicle such as a measurement vehicle for inspecting the state of the track, and an image collection device 10 including an imaging device 12 such as a CCD camera or a CMOS camera for photographing the vicinity of the rail including the track pad portion, a plurality of temperature measuring devices 21 installed at a predetermined distance along the track for measuring the temperature of the rail, a temperature data collection device 22 for collecting the image data from the image collection device 10 and the temperature data measured by the temperature measuring devices 21, and an abnormal detection device 30 composed of a data processing device for receiving the temperature data collected by the temperature data collection device 22 and detecting an abnormality in the movement amount of the track pad based on these data.

[0027] The imaging device 12 includes a pair of cameras provided at the lower part of the vehicle. As described in Patent Document 1, in order to photograph the track pad portion (the fastening portion of the rail) from an oblique direction, it is preferably arranged above the rail on the opposite side of the rail with the track pad to be photographed. Also, the imaging timing can be the timing determined by detecting components such as fastening bolts on the track using a laser displacement meter or the like. The image collection device 10 includes a storage device 13 for storing data such as images photographed by the imaging device 12, a position detector 14 such as a tachogenerator for grasping the vehicle position, a timer 15 for measuring the current time, a wireless communication device 16, and the like. The abnormal detection device 30 includes an arithmetic processing device 31, a wireless communication device 32, a storage device 33, a display device 34, and the like.

[0028] The control device 11 of the image collection device 10 and the arithmetic processing device 31 of the abnormal detection device 30 can be configured by a normal microprocessor or microcomputer having a CPU (Central Processing Unit), ROM, RAM, etc., and have a function of overall controlling each part by the cooperation of the program stored in the ROM and the CPU. Also, the arithmetic processing device 31 is configured by a program to have a function of calculating the amount of pad protrusion (movement amount) from the number of pixels based on the image data obtained by photographing the track pad with the camera. The control device 11 of the image collection device 10 grasps the position of the host vehicle based on the information from the position detector 14. When approaching the rail movable section, it photographs the track pad part with the imaging device 12 and stores the data of the photographed image together with the time data of the timer 15 in the storage device 13. The program is configured to have such a function.

[0029] In addition, the storage device 33 of the image collection device 10 stores the position information of the rail movable section and the reference trajectory loop line L as shown in FIG. 2 set for each rail movable section. Here, the reference trajectory loop line L is formed by drawing a circumscribed parallelogram of the fluctuation trajectory line of the fluctuation amount based on the pad movement amount calculated based on the image data of the track pad collected over a period of at least half a year in advance. Note that the fluctuation trajectory line T in FIG. 2 corresponds to the fluctuation trajectory line A in FIG. 7. For those with small loops like the trajectories B, C, and D in FIG. 7, a parallelogram expanded so that the position of the upper side of the circumscribed parallelogram of the movement amount trajectory moves to the upper limit value (judgment threshold) max for determining the abnormality of the movement amount and the position of the lower side moves to the lower limit value min may be set as the reference trajectory loop line.

[0030] As shown by the ● mark in FIG. 2, when the upper limit value max is exceeded, the track pad is likely to come off. Therefore, corresponding measures are taken by performing repair work such as returning the track pad to its original position or replacing it. The upper limit value max of the pad movement amount was conventionally set to a value such as 30 mm, but in this embodiment, it is set to a value such as 40 mm. This can reduce the number of pads for which an abnormality is determined and reduce the frequency of performing major repair work such as aligning or replacing the position of the pads. Furthermore, in the abnormality detection system of this embodiment, even if the detected pad movement amount does not exceed the upper limit value max, as shown by the ▲ mark in FIG. 2, it has a function of determining an abnormality when it is outside the reference trajectory loop line L.

[0031] Conventionally, due to factors such as deterioration of variable pads supporting pads, deterioration of CA mortar under the slab, aoli or sudden earthquakes in bridges, and warping of the slab due to temperature changes, the movement amount of the track pad suddenly increases within a range not exceeding the upper limit value max in a shorter period than usual. Also, even without the above phenomenon, the movement amount of the track pad may increase rapidly. When investigating the cause, it was sometimes found that the bolts of the rail fastening device were loose. In such a case, the pad movement amount becomes a value as indicated by the ▲ mark in FIG. 2. Therefore, in the abnormal detection system of the present embodiment, even when the upper limit value max is not exceeded but it greatly deviates outside the fluctuation locus line T of the fluctuation amount as indicated by the ▲ mark in FIG. 2, it can be determined as abnormal by the reference locus loop line L. Then, the cause of the displacement of the pad position is investigated. For example, if the cause is the loosening of the bolts of the rail fastening device, repair work such as tightening the bolts will be performed. Even when the cause of the abnormality is not the loosening of the bolts of the rail fastening device, work to remove the cause will be performed.

[0032] Next, the method for detecting an abnormal amount of track pad protrusion according to an embodiment of the present invention will be described in detail with reference to the flowchart of FIG. 3. In the method for detecting an abnormal amount of track pad protrusion according to the present embodiment, first, over a period of six months or more, preferably nine months to one year, at approximately the same predetermined time each time in each rail movable section, the image collecting device 10 takes an image of the track pad portion at the moving end side of the rail movable section to accumulate image data every predetermined period (for example, one week to one month) (step S1). In parallel with this, the temperature data collecting device 22 collects the rail temperature data measured by the temperature measuring device 21 arranged along the track.

[0033] Next, the image data of the track pads accumulated in step S1 is processed by image processing to calculate the movement amount of the track pads, and the measurement data of the temperature measuring device that is close to the shooting time of the image data and closest to the movable section where the image was shot is retrieved from the calculated movement amount and the rail temperature data collected by the temperature data collection device 22, and the measurement data is plotted on the temperature-movement amount coordinates as shown in FIG. 2. Then, a variation locus line T that connects the plotted points in time series is drawn (step S2). Subsequently, a parallelogram that circumscribes the variation locus line T of the variation amount is drawn and set as the reference locus loop line L (step S3).

[0034] Thereafter, the vehicle equipped with the image collection device 10 is driven, and at the same time as above, in each rail movable section, an image of the track pad part on the moving end side is captured by the image collection device 10, and the image data and the shooting position information (movable section information) are accumulated (step S4). When the shooting of the entire section is completed, the image collection device 10 transmits the accumulated data to the abnormality detection device 30 (step S5). Then, the abnormality detection device 30 receives the image data and reads the respective rail temperature data near the movable section at the corresponding time from the temperature data collection device 22 (step S6).

[0035] Next, the abnormality detection device 30 calculates the movement amount of the track pads from the image data for each movable section of interest (step S7). Then, it is determined whether the calculated movement amount is outside the reference locus loop line L shown in FIG. 2 (step S8). Here, if No, that is, if it is determined that the calculated movement amount is inside the reference locus loop line L shown in FIG. 2, the process returns to step S7 to calculate the movement amount of the track pads from the image data for the next movable section. Also, if in step S8, the abnormality detection device 30 determines Yes, that is, the calculated movement amount is outside the reference locus loop line L shown in FIG. 2, it proceeds to step S9 and determines whether the calculated movement amount exceeds the upper limit value max.

[0036] In step S9, if it is determined that the movement amount exceeds the upper limit value max (Yes), the process proceeds to step S10, and an abnormality that requires repair such as correction or replacement of the pad position is displayed on the display device 34 together with the position information (in kilometers) of the corresponding location. Also, in step S9, if it is determined that the movement amount does not exceed the upper limit value max (No), the process proceeds to step S11, and an abnormality that requires adjustment (tightening of bolts) of the rail fastening device is displayed on the display device 34 together with the position information (in kilometers) of the corresponding location. Thereafter, the process proceeds to step S12, and it is determined whether or not the processing for all the track pads in the rail movable section has been completed. If it is determined that the processing has not been completed (No), the process returns to step S7 and the above processing is repeated. On the other hand, if it is determined in step S12 that the processing for all the track pads in the rail movable section has been completed (Yes), the abnormality detection process ends.

[0037] As described above, according to the above abnormality detection process, a serious abnormality that requires significant correction or replacement of the pad position and a minor abnormality that requires adjustment (tightening of bolts, etc.) of the rail fastening device are distinguished and detected, and the repair content corresponding to each abnormality can be instructed to the operator. Also, by setting a value larger than the conventional value as the upper limit value max, the frequency of determining that a serious abnormality that requires significant rectification or replacement of the pad position has occurred in the rail movable section can be reduced, and the burden on the repair work department can be alleviated.

[0038] Note that the above abnormality detection process relates to the track pads in the rail movable section. For the track pads in the rail fixed section, a value smaller than the upper limit value max for determining the rail movable section (for example, 30 mm) is used as a threshold value for determination as in the conventional case. The position information of the rail movable section is stored in the storage device 33 of the abnormality detection device 30. When the arithmetic processing device 31 determines that the position of the track pad in the read image is in the rail movable section, the abnormality detection process is performed according to the flowchart of FIG. 3. When the position of the track pad in the image is outside the rail movable section, it is determined as a track pad in the fixed section, and the presence or absence of an abnormality is determined using the conventional threshold value.

[0039] The invention made by the present inventor has been specifically described based on the embodiments. However, the present invention is not limited to the above embodiments. For example, in the above embodiment, in the track pad protrusion amount measuring device 10, it has been described that an image of the track pad taken by the camera (12) is stored together with distance data and time data. However, when the start time of measurement, the end time of measurement, or the image data acquired in a series of measurements is stored in one file, the time when the file is created or updated may be transmitted to the abnormality detection device 30 together with the image data as the acquisition time of the image of the track pad.

[0040] In the above case, the abnormality detection device 30 calculates the shooting time of each track pad image from the received time data and distance data, and acquires the temperature information measured by the thermometer 21 close to the target track pad at that time from the rail temperature collection device 22. Thus, it is possible to detect an abnormality in the movement amount of the track pad in the same manner as the abnormality detection process shown in FIG. 3. Also, in the above embodiment, it has been described that the temperature of the rail is detected by the thermometer 21 installed on the rail at a predetermined interval along the track. However, it is also possible to mount a non-contact thermometer such as an infrared radiation temperature sensor using infrared rays or the like under the vehicle, and use the thermometer to measure the temperature of the side part of the rail near the track pad at the shooting timing of the track pad.

Explanation of Reference Numerals

[0041] 10 Image collection device 11 Control device (control means) 12 Imaging device (shooting means) 13 Storage device (storage means) 14 Position detector (position detection means) 15 Timer for timing 16 Wireless communication device 21 Thermometer (rail temperature detection means) 22 Temperature data collection device (rail temperature collection device) 30 Abnormality detection device 31 Arithmetic processing unit 32 Wireless communication device 33 Memory device 34 Display device

Claims

1. An abnormal detection system for the amount of protrusion of a track pad, comprising: an image collection device that collects data of an image obtained by photographing the vicinity of a rail while traveling by an imaging device mounted on a vehicle; a rail temperature collection device that measures the temperature of each part of the rail along the longitudinal direction of the rail and collects data of the rail temperature; and an abnormal detection device that detects an abnormality in the amount of protrusion of the track pad based on the image data collected by the image collection device and the temperature data collected by the rail temperature collection device, wherein the abnormal detection device includes: a movement amount calculation means for performing image processing on the image data collected by the image collection device to calculate the movement amount of the track pad; storage means for storing information regarding the position of a rail movable section, which is a section where an expansion joint is interposed and the rail expands and contracts with temperature changes, and a trajectory loop line that is a preset determination criterion based on a trajectory line in which a plurality of movement amounts of the track pad in a predetermined period obtained from the movement amount calculation means are represented in time series on a coordinate with temperature and movement amount as coordinate axes; a movement amount determination means for determining whether the movement amount of the track pad in the rail movable section obtained from the movement amount calculation means is outside or inside the trajectory loop line serving as a reference; a section determination means for determining whether the track pad included in the image to be determined is in the rail movable section or in a rail immovable section, which is a section where the rail axial force and the longitudinal resistance of the roadbed are balanced and the rail does not expand and contract; and the movement amount determination means outputs an abnormality when it determines that the movement amount obtained from the movement amount calculation means is outside the trajectory loop line serving as a determination criterion for the track pad determined to be in the rail movable section by the section determination means. The abnormal detection system for the amount of protrusion of the track pad is characterized by this.

2. The storage means stores an upper limit value of the amount of protrusion of the track pad, when the movement amount determination means determines that the movement amount of the track pad obtained from the movement amount calculation means is outside the trajectory loop line serving as a reference and exceeds the upper limit value, it outputs as a first abnormal state, The abnormal detection system for the amount of protrusion of the track pad according to claim 1, wherein when the movement amount determination means determines that the movement amount of the track pad obtained from the movement amount calculation means is outside the trajectory loop line serving as a reference and does not exceed the upper limit value, it outputs as a second abnormal state.

3. The orbital pad protrusion amount abnormality detection system according to claim 2, wherein the movement amount determination means outputs an abnormality when it is determined that the movement amount obtained from the movement amount calculation means exceeds a predetermined threshold value smaller than the upper limit value for the orbital pad determined to be in the rail immovable section by the section determination means.

4. A method for detecting an abnormality in the protrusion amount of an orbital pad, which collects data of an image obtained by photographing the vicinity of a rail by an imaging device while the vehicle is traveling and mounted on the vehicle, and data of the temperature of each part of the rail along the longitudinal direction of the rail, and detects an abnormality in the protrusion amount of the orbital pad based on the collected image data and temperature data, a step of collecting the image data and the temperature data obtained by photographing the vicinity of the rail in a rail movable section, which is a section where an expansion joint is interposed and the rail expands and contracts with temperature changes, at a predetermined number of days at predetermined intervals over at least six months for a plurality of times; a step of performing image processing on the collected image data of the rail movable section to calculate the movement amount of the orbital pad, and setting a reference locus loop line in advance for each rail movable section based on a locus line obtained by chronologically representing a plurality of movement amounts of the orbital pad in the predetermined period on a coordinate with temperature and movement amount as coordinate axes; a step of performing image processing on the image data of the vicinity of the rail photographed by the imaging device mounted on the vehicle to calculate the movement amount of the orbital pad; a step of determining in which of the rail movable sections the orbital pad included in the image to be determined is located; a step of determining whether the movement amount calculated for the orbital pad in the rail movable section is outside or inside the locus loop line set corresponding to the orbital pad, and outputting an abnormality when the movement amount is outside the locus loop line; characterized by comprising the above steps.

5. When it is determined that the movement amount calculated for the orbital pad in the rail movable section is outside the locus loop line set corresponding to the orbital pad and exceeds a preset upper limit value of the protrusion amount of the orbital pad, it is output as a first abnormal state, When it is determined that the amount of movement calculated for the track pad in the rail movable section is outside the trajectory loop line set corresponding to the track pad and does not exceed the upper limit value, it is output as a second abnormal state. The method for detecting an abnormal amount of protrusion of a track pad according to claim 4, characterized in that.

6. The predetermined period is 9 months or more, The trajectory loop line is, The method for detecting an abnormal amount of protrusion of a track pad according to claim 5, characterized in that it is a parallelogram circumscribing a locus line in which a plurality of movement amounts of the track pad in the predetermined period are represented in time series on a coordinate having temperature and movement amount as coordinate axes.

Images