Railway vehicle wheel shaft inspection device, railway vehicle wheel shaft inspection method and railway vehicle wheel shaft inspection program

Abstract

To provide a railway vehicle wheel shaft inspection device that can easily and accurately inspect wheel shafts while a bogie supports a vehicle body.SOLUTION: Railway vehicle wheel shaft inspection device includes a processing circuit configured to calculate a pre-correction measurement value based on a detection signal of a sensor and correct the calculated pre-correction measurement value to a post-correction measurement value for a target wheel shaft in an unloaded state. The processing circuit is configured to include: acquiring a load value equivalent to a downward load applied to the target wheel shaft in a loaded state; acquiring type information indicating a type of the target wheel shaft; acquiring a correction coefficient corresponding to the type; calculating a correction amount based on the load value and the correction coefficient; calculating a pre-correction measurement value based on the detection signal of the sensor; and correcting the pre-correction measurement value by using the correction amount to calculate the post-correction measurement value.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a railway vehicle wheelset inspection device, a railway vehicle wheelset inspection method, and a railway vehicle wheelset inspection program. [Background technology]

[0002] Patent Document 1 describes a wheelset inspection device that inspects the wheelset of a bogie while the bogie is in a loaded state with the carbody supported by the bogie. The wheelset inspection device includes a first distance sensor that is arranged on the outside of the rail and wheel on which the railway vehicle runs and that measures a first distance to the outer surface of the wheel flange, a second distance sensor that is arranged on the inside of the rail and wheel and that measures a second distance to the inner surface of the wheel, and calculation means that calculates the thickness of the wheel flange based on the measured first and second distances. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 7-243845 Summary of the Invention [Problem to be solved by the invention]

[0004] When the bogie supports the car body under load, the downward load from the car body is applied to both ends of the axle, causing the axle to bend. The wheelset inspection device measures the first distance based on the detection signal of the first distance sensor and the second distance based on the detection signal of the second distance sensor under load. Therefore, the first distance and the second distance each fluctuate depending on the fluctuation of the downward load acting on the wheelset. For example, when a method similar to that of the wheelset inspection device is used to calculate the flange outer surface distance from the centerline extending vertically through the center of the wheelset in the vehicle width direction based on the detection signal of the first distance sensor under load, and then calculate the wheel inner surface distance from the centerline to the inner surface of the wheel, the calculated flange outer surface distance and wheel inner surface distance each fluctuate depending on the fluctuation of the downward load acting on the wheelset. This makes it difficult to compare the calculated flange outer surface distance and wheel inner surface distance with the normal values ​​of the wheelset alone under no load. This makes it difficult to easily perform accurate wheelset inspections.

[0005] Therefore, an object of the present disclosure is to provide a railway vehicle wheelset inspection device that can easily and accurately inspect wheelsets while the bogie supports the carbody. [Means for solving the problem]

[0006] A railway vehicle wheelset inspection device according to one embodiment of the present disclosure is a device for inspecting a target wheelset of a bogie in a loaded state in which the bogie supports a car body, and is equipped with at least one sensor that detects the distance to the surface of the lower part of the wheel of the target wheelset facing in the vehicle width direction in the loaded state, and a processing circuit configured to calculate a pre-correction measurement value based on the detection signal of the sensor and correct the calculated pre-correction measurement value to a post-correction measurement value for the target wheelset in an unloaded state, wherein the processing circuit is configured to obtain a load value equivalent to the downward load applied to the target wheelset in the loaded state, obtain type information indicating the type of the target wheelset, obtain a correction coefficient corresponding to the type, calculate a correction amount based on the load value and the correction coefficient, calculate the pre-correction measurement value based on the detection signal of the sensor, and correct the pre-correction measurement value using the correction amount to calculate the post-correction measurement value.

[0007] According to one aspect of the present disclosure, the pre-correction measurement value of the target wheelset in a loaded state is corrected to the post-correction measurement value of the target wheelset in an unloaded state, making it easy to perform accurate inspection of the wheelset while the bogie is supporting the car body. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a block diagram of a wheelset inspection device according to an embodiment. [Figure 2] FIG. 2 is a schematic view of a wheelset in a loaded state as viewed in the vehicle longitudinal direction. [Figure 3] FIG. 3 is a schematic diagram for explaining the calculation of the flange outer surface distance and the wheel inner surface distance. [Figure 4] FIG. 4 is a flowchart of the processing performed by the processing circuit of the railway vehicle wheelset inspection device. [Figure 5] FIG. 5 shows a subroutine of the process of acquiring the correction coefficients shown in FIG. [Figure 6] FIG. 6 is a diagram showing a database of variable coefficients. [Figure 7]FIG. 7 is a graph showing the fluctuation of the correction coefficient due to the fluctuation of the wheel diameter value of the target wheelset. [Figure 8] FIG. 8 is a graph showing the fluctuation of the correction amount due to the fluctuation of the load value for each of three target wheelsets having different wheel diameter values. [Figure 9] FIG. 9 is a schematic diagram showing how the first distance and the second distance are detected by the first distance sensor and the second distance sensor at a plurality of locations spaced apart from each other in the circumferential direction of the wheel of the target wheelset. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment will be described with reference to the drawings. In the following description, the direction in which the railway vehicle 2 travels is defined as the vehicle longitudinal direction (front-rear direction), and the lateral direction perpendicular to the vehicle longitudinal direction is defined as the vehicle width direction (left-right direction).

[0010] FIG. 1 is a block diagram of a wheelset inspection device 1 according to an embodiment. FIG. 2 is a schematic diagram of a wheelset 35 in a loaded state as viewed from the longitudinal direction of the vehicle. As shown in FIGS. 1 and 2, the wheelset inspection device 1 is a device that inspects a wheelset 35 of a bogie 32 of a railway vehicle 2 in a loaded state (hereinafter simply referred to as the "loaded state") in which the bogie 32 supports a carbody 30. The railway vehicle 2 includes a carbody 30 and a bogie 32 that supports the carbody 30 from below via secondary suspensions 31 (e.g., air springs). The bogie 32 includes a bogie frame 33, a wheelset 35, an axle box 36 that rotatably supports the wheelset 35, and a primary suspension 37 (e.g., a coil spring) interposed between the bogie frame 33 and the axle box 36.

[0011] Here, a center line CL is defined as a line extending vertically through the center of the wheelset 35 in the vehicle width direction. Under load, a downward load is applied from the carbody 30 to each of the two ends of the axle 43 of the wheelset 35 in the vehicle width direction via the secondary suspension 31, bogie frame 33, primary suspension 37, and axle box 36. This causes the wheelset 35 to bend, and when viewed from the vehicle longitudinal direction, the lower part of the wheel 40 approaches the center line CL and the upper part of the wheel 40 tilts away from the center line CL. The wheelset inspection device 1 inspects the wheelset 35 under such a loaded condition.

[0012] The wheelset inspection device 1 includes a computer 10, a type sensor 11 (third sensor), a wheel diameter sensor 12, a load sensor 13, a first distance sensor 14 (first sensor), and a second distance sensor 15 (second sensor). The computer 10 is connected to the type sensor 11, the wheel diameter sensor 12, the load sensor 13, the first distance sensor 14, and the second distance sensor 15 so as to be able to communicate with each other via wire or wirelessly.

[0013] The computer 10 includes a processor 20, a system memory 21, a storage memory 22 (memory), and an interface 23. The processor 20 is, for example, a central processing unit (CPU). Note that the processor 20 may be distributed across multiple processors. The system memory 21 is, for example, a RAM. The storage memory 22 is an example of a computer-readable medium, and is a non-transitory, tangible medium. The storage memory 22 may include a ROM. The storage memory 22 may include a hard disk, a flash memory, or a combination thereof.

[0014] The storage memory 22 stores a wheelset inspection program P (hereinafter simply referred to as "wheelset inspection program P") for the railway vehicle 2 and a database DB. The configuration in which the processor 20 executes the wheelset inspection program P read into the system memory 21 is an example of a processing circuit of the wheelset inspection device 1. In other words, the computer 10 can be an example of a processing circuit. Note that part or all of the wheelset inspection program P may be executed by a processing circuit of a server connected to the wheelset inspection device 1 via a network.

[0015] The interface 23 is a communication interface that receives detection signals from the type sensor 11, the wheel diameter sensor 12, the load sensor 13, the first distance sensor 14, and the second distance sensor 15, respectively.

[0016] The functions of the elements disclosed herein can be performed using circuits or processing circuits, including general-purpose processors, special-purpose processors, integrated circuits, ASICs (Application Specific Integrated Circuits), conventional circuits, and / or combinations thereof, configured or programmed to perform the disclosed functions. A processor is considered a processing circuit or circuit because it includes transistors and other circuitry. In this disclosure, a circuit, unit, or means is hardware that performs the recited functions or hardware that is programmed to perform the recited functions. The hardware may be hardware disclosed herein or other known hardware that is programmed or configured to perform the recited functions. Where the hardware is a processor, which is considered a type of circuit, the circuit, means, or unit is a combination of hardware and software, and the software is used to configure the hardware and / or processor.

[0017] In the following description, the wheelset 35 to be inspected by the wheelset inspection device 1 will be referred to as the target wheelset 35.

[0018] The type sensor 11 detects type information indicating the type of the target wheelset 35. The type sensor 11 may be an RFID reader that reads type information stored in an RFID tag attached to the car body 30 or the bogie 32 (for example, the target wheelset 35), or may be a camera that reads type information written on the surface of the car body 30 or the bogie 32 (for example, the target wheelset 35) as image information.

[0019] The wheel diameter sensor 12 may be, for example, an optical distance sensor placed on the ground between a pair of rails R and detecting a distance value VDA corresponding to the vertical distance to the axle 43 of the target wheel set 35. In such a case, for example, the tip of the projector of the wheel diameter sensor 12 may be located higher than the bottom end of the wheel 40 of the target wheel set 35. The processor 20 calculates a wheel diameter value D corresponding to the wheel diameter based on the detection signal of the wheel diameter sensor 12. Specifically, the processor 20 may calculate the wheel diameter value D by doubling the value obtained by adding the distance value VDA detected by the wheel diameter sensor 12 to the distance value VDB corresponding to the vertical distance from the tip of the projector of the wheel diameter sensor 12 to the bottom end of the wheel 40 of the target wheel set 35, and then adding the result to a diameter value DI corresponding to the diameter of the axle 43. That is, the relational expression D=2(VDA+VDB)+DI holds. The diameter of the axle 43 and the vertical distance from the tip of the projector of the wheel diameter sensor 12 to the bottom end of the wheel 40 of the target wheel set 35 may each be stored in the storage memory 22. The wheel diameter sensor 12 may be any sensor that can detect the distance value VDA, and may be an ultrasonic distance sensor, a sensor that detects the wheel diameter value D based on image information captured by a camera, or another sensor.

[0020] The load sensor 13 detects a load value corresponding to a downward load acting on the rail R located below the target wheelset 35 in a loaded state. The load sensor 13 may be a load cell embedded in the mounting surface so as to contact the underside of the rail R. The processor 20 acquires a load value W corresponding to the downward load acting on the target wheelset 35 in a loaded state based on the detection signal of the load sensor 13. Specifically, the processor 20 calculates the load value W by, for example, subtracting a load value corresponding to the weight of the target wheelset 35 and the rail R from the load value detected by the load sensor 13. The load value corresponding to the downward load from the railway vehicle 2 and the rail R may be stored in the storage memory 22.

[0021] FIG. 3 is a schematic diagram illustrating the calculation of the flange outer surface distance LA and the wheel inner surface distance LB. As shown in FIG. 3, the first distance sensor 14 is an optical distance sensor located on the outer side of the target wheelset 35 in the vehicle width direction and detects a first distance LLA to the flange outer surface 41a, which is the outer surface facing outward in the vehicle width direction of the flange 41 of the lower portion of the wheel 40 of the target wheelset 35 under a loaded condition. The second distance sensor 15 is an optical distance sensor located on the inner side of the target wheelset 35 in the vehicle width direction and detects a second distance LLB to the wheel inner surface 40a, which is the inner surface facing inward in the vehicle width direction of the lower portion of the wheel 40 under a loaded condition. Note that the first distance sensor 14 may be any sensor capable of detecting the first distance LLA, and may be an ultrasonic distance sensor, a sensor that detects the first distance LLA based on image information captured by a camera, or another sensor. The same applies to the second distance sensor 15.

[0022] The processor 20 calculates a flange outer surface distance LA corresponding to the distance from the center line CL to the flange outer surface 41a based on the detection signal of the first distance sensor 14. Specifically, the processor 20 calculates the flange outer surface distance LA by subtracting the first distance LLA detected by the first distance sensor 14 from a third distance LLC from the center line CL to the tip of the projector of the first distance sensor 14. That is, the relational expression LA = LLC - LLA holds. The third distance LLC may be stored in the storage memory 22. Then, the processor 20 doubles the flange outer surface distance LA to calculate a first pre-corrected measurement value Pre(2LA).

[0023] The processor 20 calculates a wheel inner surface distance LB corresponding to the distance from the center line CL to the wheel inner surface 40a based on the detection signal of the second distance sensor 15. Specifically, the processor 20 calculates the wheel inner surface distance LB by adding the second distance LLB detected by the second distance sensor 15 to a fourth distance LLD from the center line CL to the tip of the projector of the second distance sensor 15. That is, the relational expression LB = LLD + LLB holds. The fourth distance LLD may be stored in the storage memory 22. Then, the processor 20 doubles the wheel inner surface distance LB to calculate a second pre-corrected measurement value Pre(2LB).

[0024] Figure 4 is a flowchart of processing performed by the processing circuit of the wheelset inspection device 1 for a railway vehicle 2. Below, the steps of the wheelset inspection method for a railway vehicle 2 will be explained along the flow of Figure 4, with appropriate reference to Figure 1 etc. The processor 20 operates in accordance with the wheelset inspection program P read into the system memory 21. The wheelset inspection device 1 inspects the target wheelset 35 of the railway vehicle 2 while the railway vehicle 2 is running on rails R. At this time, the railway vehicle 2 may be in commercial operation and running with people on board.

[0025] First, the processor 20 acquires a load value W corresponding to the downward load acting on the target wheelset 35 under load based on the detection signal of the load sensor 13 (step S1). Next, the processor 20 acquires type information indicating the type of the target wheelset 35 based on the detection signal of the type sensor 11 (step S2). Next, the processor 20 acquires a correction coefficient α corresponding to the type of the target wheelset 35 based on the type information of the target wheelset 35 acquired in step S2 (step S3).

[0026] FIG. 5 shows a subroutine for the process of acquiring the correction coefficient α of FIG. 4. As shown in FIG. 5, the processor 20 references the database DB stored in the storage memory 22 to acquire a variable coefficient β corresponding to the type information acquired in step S2 (step S9). FIG. 6 is a diagram showing the database DB of the variable coefficient β. As shown in FIG. 6, one variable coefficient β is defined for each type of target wheelset 35. For example, a variable coefficient "β1" corresponding to type "1," a variable coefficient "β2" corresponding to type "2," a variable coefficient "β3" corresponding to type "3," a variable coefficient "β4" corresponding to type "4," and a variable coefficient "β5" corresponding to type "5" are defined. The variable coefficients β (e.g., variable coefficients "β1" to "β5") stored in the database DB may be determined in advance through experiments or may be determined by theoretical analysis such as finite element analysis.

[0027] Returning to FIG. 5, the processor 20 calculates the wheel diameter value D corresponding to the wheel diameter of the target wheelset 35 (step S10). As described above, the processor 20 may calculate the wheel diameter value D using the relational expression D=2(VDA+VDB)+DI. Next, the processor 20 multiplies the wheel diameter value D by the variable coefficient β to calculate the correction coefficient α (step S11). That is, the relational expression α=β·D holds.

[0028] Returning to FIG. 4, the processor 20 calculates the correction amount Δ(2LB) based on the load value W acquired in step S1 and the correction coefficient α acquired in step S3 (step S4). Specifically, the processor 20 calculates the correction amount Δ(2LB) by multiplying the load value W by the correction coefficient α. That is, the relational expression Δ(2LB) = α·W holds. The correction amount Δ(2LB) corresponds to the amount of change in the wheel inner surface distance 2LB under load from the wheel inner surface distance 2LB under unloaded conditions. FIG. 8 is a graph showing the variation in the correction amount Δ(2LB) due to variations in the load value W for three target wheel sets 35 with different wheel diameter values ​​D. As shown in FIG. 8, the wheel diameters of the three target wheel sets 35 are R1, R2, and R3, respectively, with R1 > R2 and R2 > R3. That is, as the wheel diameter increases, the slope of the graph becomes steeper, and the rate of increase in the correction amount Δ(2LB) with an increase in the load value W increases.

[0029] 4, the processor 20 then calculates pre-corrected measurement values ​​Pre(2LA) and Pre(2LB) based on the detection signals of the first distance sensor 14 and the second distance sensor 15. Specifically, the processor 20 acquires the first distance LLA from the first distance sensor 14, acquires the third distance LLC from the storage memory 22, calculates the flange outer surface distance LA based on the relational expression LA = LLC - LLA, and doubles the flange outer surface distance LA to calculate the first pre-corrected measurement value Pre(2LA) (step S5). The processor 20 also acquires the second distance LLB from the second distance sensor 15, acquires the fourth distance LLD from the storage memory 22, calculates the wheel inner surface distance LB based on the relational expression LB = LLD + LLB, and doubles the wheel inner surface distance LB to calculate the second pre-corrected measurement value Pre(2LB) (step S5).

[0030] In step S5, a first provisional pre-correction measurement value TPre(2LA) equivalent to a plurality of first provisional pre-correction measurement values ​​Pre(2LA) may be calculated based on the detection signals of the first distance sensor 14 at a plurality of locations (e.g., four locations) spaced apart in the circumferential direction of the wheel 40 of the target wheel set 35, and the average of the calculated plurality (e.g., four) first provisional pre-correction measurement values ​​TPre(2LA) may be calculated as the first provisional pre-correction measurement value Pre(2LA). Similarly, in step S5, a second provisional pre-correction measurement value TPre(2LB) equivalent to a plurality of second provisional pre-correction measurement values ​​Pre(2LB) may be calculated based on the detection signals of the second distance sensor 15 at a plurality of locations (e.g., four locations) spaced apart in the circumferential direction of the wheel 40 of the target wheel set 35, and the average of the calculated plurality (e.g., four) second provisional pre-correction measurement values ​​TPre(2LB) may be calculated as the second provisional pre-correction measurement value Pre(2LB).

[0031] 9 is a schematic diagram showing how the first distance LLA and the second distance LLB are detected by the first distance sensor 14 and the second distance sensor 15 at multiple locations spaced apart in the circumferential direction of the wheel 40 of the target wheelset 35. As shown in FIG. 9, multiple (e.g., four) pairs of first distance sensors 14 and second distance sensors 15 are arranged along the length of the rail R. In this case, for example, the distance between two adjacent pairs may be ¼ of the circumference of the wheel 40 of the target wheelset 35. This allows the processor 20 to calculate four first distances LLA and second distances LLB based on the detection signals of the first distance sensor 14 and the second distance sensor 15 at four measurement locations 45a to 45d spaced apart in the circumferential direction of the wheel 40 of the target wheelset 35 when the railway vehicle 2 travels on the rail R. Then, the processor 20 can calculate a first pre-correction measurement value Pre(2LA) based on the calculated four first distances LLA, and calculate a second pre-correction measurement value Pre(2LB) based on the calculated four second distances LLB.

[0032] 4, next, processor 20 uses the correction amount Δ(2LB) calculated in step S4 to correct the pre-correction measurement values ​​Pre(2LA), Pre(2LB) detected in step S5, and calculates the post-correction measurement values ​​Post(2LA), Post(2LB) for the target wheelset 35 in an unloaded state. Specifically, processor 20 adds the correction amount Δ(2LB) calculated in step S4 to the first pre-correction measurement value Pre(2LA) calculated in step S5 to calculate the first post-correction measurement value Post(2LA), and also adds the correction amount Δ(2LB) calculated in step S4 to the second pre-correction measurement value Pre(2LB) calculated in step S5 to calculate the second post-correction measurement value Post(2LB).

[0033] Next, the processor 20 acquires a normal value NVA for the first post-correction measurement value Post(2LA) of the target wheelset 35 and a normal value NVB for the second post-correction measurement value Post(2LB) of the target wheelset 35 (step S7). The normal values ​​NVA and NVB may be stored in the storage memory 22. Finally, the processor 20 determines whether or not there is an abnormality in the first post-correction measurement value Post(2LA) based on a comparison between the normal value NVA acquired in step S7 and the first post-correction measurement value Post(2LA) calculated in step S6, and determines whether or not there is an abnormality in the second post-correction measurement value Post(2LB) based on a comparison between the normal value NVB acquired in step S7 and the second post-correction measurement value Post(2LB) calculated in step S6 (step S8). For example, the processor 20 may determine an abnormality when the difference between the normal value NVA and the first post-correction measurement value Post(2LA) exceeds a threshold, and may determine an abnormality when the difference between the normal value NVB and the second post-correction measurement value Post(2LB) exceeds a threshold.

[0034] According to the configuration described above, the pre-corrected measurement values ​​Pre(2LA), Pre(2LB) of the target wheelset 35 in a loaded state are corrected to the post-corrected measurement values ​​Post(2LA), Post(2LB) of the target wheelset 35 in an unloaded state, so that accurate inspection of the target wheelset 35 can be easily performed while the bogie 32 supports the car body 30.

[0035] Since the correction amount Δ(2LB) is calculated using the wheel diameter value D detected by the wheel diameter sensor 12, the post-correction measurement values ​​Post(2LA), Post(2LB) can be accurately calculated even if the wheel diameter of the target wheelset 35 fluctuates due to, for example, grinding or wear.

[0036] Since the variable coefficient β is obtained by referencing the storage memory 22 based on the type of the target wheelset 35, the post-correction measurement values ​​Post(2LA) and Post(2LB) can be easily calculated.

[0037] The first distance sensor 14 measures the first distance LLA at multiple locations spaced apart in the circumferential direction of the wheel 40 of the target wheelset 35, calculates a first tentative pre-corrected measurement value TPre(2LA) corresponding to the multiple first pre-corrected measurement values ​​Pre(2LA) based on the detection signal of the first distance sensor 14, and calculates the average of the multiple calculated first tentative pre-corrected measurement values ​​TPre(2LA) as the first pre-corrected measurement value Pre(2LA).Therefore, even if the first distance LLA differs at multiple locations spaced apart in the circumferential direction of the wheel 40, the first post-corrected measurement value Post(2LA) can be accurately calculated. Similarly, even if the second distance LLB differs at multiple locations spaced apart in the circumferential direction of the wheel 40, the second post-corrected measurement value Post(2LB) can be accurately calculated.

[0038] Since the first post-correction measurement value Post(2LA) and the second post-correction measurement value Post(2LB) are calculated, the thickness of the flange 41, for example, can be accurately calculated based on these values.

[0039] Since the wheelset inspection device 1 is equipped with the type sensor 11, the processor 20 can easily obtain type information of the target wheelset 35 from the type sensor 11.

[0040] Since the processor 20 determines whether or not there is an abnormality in the first post-correction measurement value Post(2LA) based on a comparison between the normal value NVA for the first post-correction measurement value Post(2LA) and the first post-correction measurement value Post(2LA), the processor 20 can easily determine whether or not there is an abnormality in the target wheelset 35. Similarly, since the processor 20 determines whether or not there is an abnormality in the second post-correction measurement value Post(2LB) based on a comparison between the normal value NVB for the second post-correction measurement value Post(2LB) and the second post-correction measurement value Post(2LB), the processor 20 can easily determine whether or not there is an abnormality in the target wheelset 35.

[0041] It should be noted that the technology of the present disclosure is not limited to the above-described configuration.

[0042] In the above embodiment, a case has been described in which the third distance LLC from the center line CL to the tip of the projector of the first distance sensor 14 is stored in the storage memory 22, and the flange outer surface distance LA is calculated by subtracting the first distance LLA detected by the first distance sensor 14 from the third distance LLC. However, this is not limited to this case. For example, a distance value corresponding to the distance from the tip of the projector of one first distance sensor 14 measuring one wheel 40 to the tip of the projector of the other first distance sensor 14 measuring the other wheel 40 may be stored in the storage memory 22, and the flange outer surface distance LA may be calculated by subtracting the first distance LLA detected by one first distance sensor 14 and the first distance LLA detected by the other first distance sensor 14 from the distance value. Alternatively, the flange outer surface distance LA may be calculated using another procedure.

[0043] In the above embodiment, a case has been described in which the fourth distance LLD from the center line CL to the tip of the projector of the second distance sensor 15 is stored in the storage memory 22, and the wheel inner surface distance LB is calculated by adding the second distance LLB detected by the second distance sensor 15 to the fourth distance LLD. However, this is not limited to this case. For example, a distance value corresponding to the distance from the tip of the projector of one second distance sensor 15 measuring one wheel 40 to the tip of the projector of the other second distance sensor 15 measuring the other wheel 40 may be stored in the storage memory 22, and the wheel inner surface distance LB may be calculated by adding the second distance LLB detected by one second distance sensor 15 and the second distance LLB detected by the other second distance sensor 15 to the distance value. Alternatively, the wheel inner surface distance LB may be calculated by another procedure.

[0044] In the above embodiment, a case has been described in which the wheelset inspection device 1 inspects the target wheelset 35 of the railway vehicle 2 while the railway vehicle 2 is running on the rails R. However, the present invention is not limited to this case, and the wheelset inspection device 1 can also inspect the target wheelset 35 when the railway vehicle 2 is stopped using the same procedure as when the railway vehicle 2 is running.

[0045] In the above embodiment, the wheel diameter sensor 12 measures the wheel diameter value D corresponding to the wheel diameter of the target wheel set 35, and the processor 20 acquires the wheel diameter value D from the wheel diameter sensor 12. However, this is not limited to this case, and the wheel diameter value D may be stored in the storage memory 22 for each type of wheel set, and the processor 20 may acquire from the storage memory 22 the wheel diameter value D corresponding to the type detected by the type sensor 11.

[0046] In the above embodiment, a case has been described in which, in an outside frame bogie whose side beams are located outward in the vehicle width direction from the wheels 40, the wheelset 35 is deflected into an upwardly convex shape due to a downward load from the carbody 30, resulting in a state in which, when viewed from the vehicle longitudinal direction, the upper part of the wheel 40 approaches the center line CL and the lower part of the wheel 40 is tilted away from the center line CL. However, this is not limited to this case. Even in a case in which, in an inside frame bogie whose side beams are located inward in the vehicle width direction from the wheels 40, the wheelset inspection device 1 can inspect the target wheelset 35 using the same procedure as in the above embodiment, the wheelset inspection device 1 can inspect the target wheelset 35 using the same procedure as in the above embodiment.

[0047] In the above embodiment, the flange outer surface distance LA is doubled to calculate the first pre-correction measurement value Pre(2LA). However, this is not limited to this. For example, the first pre-correction measurement value Pre(LLA) may be the first distance LLA to the flange outer surface 41a, which is the outer surface facing outward in the vehicle width direction of the flange 41 of the lower portion of the wheel 40 of the target wheelset 35 under loaded conditions. In such a case, the correction amount Δ(LLA) may be the amount of change in the first distance LLA under loaded conditions from the first distance LLA under unloaded conditions. Similarly, the second pre-correction measurement value Pre(LLB) may be the second distance LLB to the wheel inner surface 40a, which is the inner surface facing inward in the vehicle width direction of the lower portion of the wheel 40 of the target wheelset 35 under loaded conditions. In such a case, the correction amount Δ(LLB) may be the amount of change in the second distance LLB under loaded conditions from the second distance LLB under unloaded conditions.

[0048] In the above embodiment, the wheelset inspection device 1 is equipped with the first distance sensor 14 and the second distance sensor 15, and the processor 20 corrects the first pre-corrected measurement value Pre(2LA) to the first post-corrected measurement value Post(2LA) based on the detection signal of the first distance sensor 14, and corrects the second pre-corrected measurement value Pre(2LB) to the second post-corrected measurement value Post(2LB) based on the detection signal of the second distance sensor 15. However, this is not limited to this case, and the wheelset inspection device 1 may be equipped with only the first distance sensor 14, and the processor 20 may correct the first pre-corrected measurement value Pre(2LA) to the first post-corrected measurement value Post(2LA) based on the detection signal of the first distance sensor 14. Alternatively, the wheelset inspection device 1 may be equipped with only the second distance sensor 15, and the processor 20 may correct the second pre-corrected measurement value Pre(2LB) to the second post-corrected measurement value Post(2LB) based on the detection signal of the second distance sensor 15.

[0049] In the above embodiment, the correction amount Δ(2LB) is used to describe the amount of change in the wheel inner surface distance 2LB under a load from the wheel inner surface distance 2LB under an unloaded state. However, the present invention is not limited to this case, and the correction amount Δ(2LA) may be the amount of change in the flange outer surface distance 2LA under a load from the flange outer surface distance 2LA under an unloaded state. The relational expression Δ(2LA)=Δ(2LB) is established.

[0050] Each of the following aspects is a disclosure of a preferred embodiment. [Aspect 1] An apparatus for inspecting a target wheel set of a bogie in a loaded state in which the bogie supports a car body, At least one sensor that detects the distance to a surface of a lower portion of the wheel of the target wheelset facing in the vehicle width direction in the loaded state; a processing circuit configured to calculate a pre-correction measurement value based on the detection signal of the sensor and correct the calculated pre-correction measurement value to a post-correction measurement value for the target wheelset in an unloaded state; The processing circuitry acquiring a load value corresponding to a downward load acting on the target wheelset in the loaded state; acquiring type information indicating the type of the target wheelset; obtaining a correction coefficient corresponding to the type; calculating a correction amount based on the load value and the correction coefficient; calculating the pre-corrected measurement value based on the detection signal of the sensor; correcting the pre-corrected measurement value using the correction amount to calculate the post-corrected measurement value; A railway vehicle wheelset inspection device configured to perform the following. [Aspect 2] obtaining the correction coefficient includes obtaining a variable coefficient corresponding to the type of the target wheel set, obtaining a wheel diameter value corresponding to the wheel diameter of the target wheel set, and multiplying the variable coefficient by the wheel diameter value to calculate the correction coefficient; 2. The railway vehicle wheelset inspection device according to claim 1, wherein calculating the correction amount includes multiplying the load value by the correction coefficient to calculate the correction amount. [Aspect 3] further comprising a memory storing a plurality of said variable coefficients in association with the plurality of said types, 3. The railway vehicle wheelset inspection device according to claim 2, wherein acquiring the variable coefficient includes referencing the memory to acquire the variable coefficient corresponding to the acquired type information. [Aspect 4] the sensor measures the distance at a plurality of locations spaced apart from one another in the circumferential direction of the wheel of the target wheelset; A railway vehicle wheelset inspection device described in any of aspects 1 to 3, wherein calculating the pre-correction measurement value includes calculating provisional pre-correction measurement values ​​corresponding to multiple pre-correction measurement values ​​based on the detection signal of the sensor, and calculating the average value of the calculated provisional pre-correction measurement values ​​as the pre-correction measurement value. [Aspect 5] the at least one sensor includes a first sensor that detects a first distance to an outer surface of a flange of a lower portion of the wheel of the target wheelset facing outward in the vehicle width direction in the loaded state, and a second sensor that detects a second distance to an inner surface of the lower portion of the wheel facing inward in the vehicle width direction in the loaded state, the pre-correction measurements include a first pre-correction measurement and a second pre-correction measurement; calculating the pre-correction measurement value includes calculating the first pre-correction measurement value based on a detection signal of the first sensor, and calculating the second pre-correction measurement value based on a detection signal of the second sensor; the post-correction measurements include a first post-correction measurement and a second post-correction measurement; A wheelset inspection device for a railway vehicle described in any of aspects 1 to 4, wherein calculating the post-correction measurement value includes correcting the first pre-correction measurement value using the correction amount to calculate the first post-correction measurement value, and correcting the second pre-correction measurement value using the correction amount to calculate the second post-correction measurement value. [Aspect 6] 6. The railway vehicle wheelset inspection device according to any one of aspects 1 to 5, further comprising a third sensor that detects the type information of the target wheelset. [Aspect 7] The processing circuitry obtaining a normal value for the post-correction measurement value of the target wheelset; determining whether or not there is an abnormality in the post-correction measurement value based on a comparison between the normal value and the post-correction measurement value; 7. The railway vehicle wheelset inspection device according to any one of aspects 1 to 6, further configured to: [Aspect 8] A method for inspecting a target wheelset of a bogie in a loaded state in which the bogie supports a carbody, comprising: acquiring a load value corresponding to a downward load acting on the target wheelset in the loaded state; acquiring type information indicating the type of the target wheelset; obtaining a correction coefficient corresponding to the type; calculating a pre-correction measurement value based on the distance to a surface of a lower portion of the wheel of the target wheelset facing in a vehicle width direction under the load condition; calculating a correction amount based on the load value and the correction coefficient; correcting the pre-correction measurement value using the correction amount to calculate a post-correction measurement value for the target wheelset in an unloaded state; A railway vehicle wheelset inspection method comprising: [Aspect 9] A railway vehicle wheelset inspection program that causes a processing circuit to perform the railway vehicle wheelset inspection method described in embodiment 8. [Explanation of symbols]

[0051] 1. Wheelset inspection equipment 2. Railway vehicles 11 Type sensor (third sensor) 14 First distance sensor (first sensor) 15 Second distance sensor (second sensor) 20 processors 22 Storage memory (memory) 30 Body 32 cart 35 Wheel set (target wheel set) 40 wheels 41 flange 43 axles P Wheelset Inspection Program LLA 1st Distance LLB 2nd Distance

Claims

1. An apparatus for inspecting a target wheel set of a bogie in a loaded state in which the bogie supports a car body, At least one sensor that detects the distance to a surface of a lower portion of the wheel of the target wheelset facing in the vehicle width direction in the loaded state; a processing circuit configured to calculate a pre-correction measurement value based on the detection signal of the sensor and correct the calculated pre-correction measurement value to a post-correction measurement value for the target wheelset in an unloaded state; The processing circuitry acquiring a load value corresponding to a downward load acting on the target wheelset in the loaded state; acquiring type information indicating the type of the target wheelset; obtaining a correction coefficient corresponding to the type; calculating a correction amount based on the load value and the correction coefficient; calculating the pre-corrected measurement value based on the detection signal of the sensor; correcting the pre-corrected measurement value using the correction amount to calculate the post-corrected measurement value; A railway vehicle wheelset inspection device configured to perform the following.

2. obtaining the correction coefficient includes obtaining a variable coefficient corresponding to the type of the target wheel set, obtaining a wheel diameter value corresponding to the wheel diameter of the target wheel set, and multiplying the variable coefficient by the wheel diameter value to calculate the correction coefficient; 2. The railway vehicle wheelset inspection device according to claim 1, wherein calculating the correction amount includes multiplying the load value by the correction coefficient to calculate the correction amount.

3. further comprising a memory storing a plurality of said variable coefficients in association with the plurality of said types, 3. The railway vehicle wheelset inspection device according to claim 2, wherein acquiring the variable coefficient includes referencing the memory to acquire the variable coefficient corresponding to the acquired type information.

4. the sensor measures the distance at a plurality of locations spaced apart from one another in the circumferential direction of the wheel of the target wheelset; 3. A railway vehicle wheelset inspection device as described in claim 1 or 2, wherein calculating the pre-correction measurement value includes calculating provisional pre-correction measurement values ​​corresponding to a plurality of the pre-correction measurement values ​​based on the detection signal of the sensor, and calculating the average value of the calculated provisional pre-correction measurement values ​​as the pre-correction measurement value.

5. the at least one sensor includes a first sensor that detects a first distance to an outer surface of a flange of a lower portion of the wheel of the target wheelset facing outward in the vehicle width direction in the loaded state, and a second sensor that detects a second distance to an inner surface of the lower portion of the wheel facing inward in the vehicle width direction in the loaded state, the pre-correction measurements include a first pre-correction measurement and a second pre-correction measurement; calculating the pre-correction measurement value includes calculating the first pre-correction measurement value based on a detection signal of the first sensor and calculating the second pre-correction measurement value based on a detection signal of the second sensor; the post-correction measurements include a first post-correction measurement and a second post-correction measurement; 3. A railway vehicle wheelset inspection device as described in claim 1 or 2, wherein calculating the post-correction measurement value includes correcting the first pre-correction measurement value using the correction amount to calculate the first post-correction measurement value, and correcting the second pre-correction measurement value using the correction amount to calculate the second post-correction measurement value.

6. 3. The railway vehicle wheelset inspection device according to claim 1, further comprising a third sensor that detects the type information of the target wheelset.

7. The processing circuitry obtaining a normal value for the post-correction measurement value of the target wheelset; determining whether or not there is an abnormality in the post-correction measurement value based on a comparison between the normal value and the post-correction measurement value; 3. The railway vehicle wheelset inspection device according to claim 1, further configured to perform the following:

8. A method for inspecting a target wheelset of a bogie in a loaded state in which the bogie supports a carbody, comprising: acquiring a load value corresponding to a downward load acting on the target wheelset in the loaded state; acquiring type information indicating the type of the target wheelset; obtaining a correction coefficient corresponding to the type; calculating a pre-correction measurement value based on the distance to a surface of a lower portion of the wheel of the target wheelset facing in a vehicle width direction under the load condition; calculating a correction amount based on the load value and the correction coefficient; correcting the pre-correction measurement value using the correction amount to calculate a post-correction measurement value for the target wheelset in an unloaded state; A railway vehicle wheelset inspection method comprising:

9. A railway vehicle wheelset inspection program that causes a processing circuit to perform the railway vehicle wheelset inspection method according to claim 8.

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