Inspection device and inspection method

Abstract

This disclosure describes an inspection device and inspection method capable of inspecting the damage condition of the roller shaft of a support roller. [Solution] The inspection device comprises a first measuring unit configured to measure radial displacement at a predetermined first position on the circumferential surface of the support roller supporting the cylindrical body of a horizontally mounted cylindrical rotating device or on the circumferential surface of the roller shaft of the support roller; a second measuring unit configured to measure radial displacement at a predetermined second position on the circumferential surface of the support roller or on the circumferential surface of the roller shaft; and a control unit. The control unit is configured to perform a first process of calculating difference data, which is the difference between first time-series data of radial displacement measured by the first measuring unit and second time-series data of radial displacement measured by the second measuring unit, and a second process of determining the damage state of the roller shaft based on the difference data.

Description

Technical Field

[0001] The present disclosure relates to an inspection apparatus and an inspection method.

Background Art

[0002] Patent Document 1 discloses an adjusting device for adjusting the position of a support roller that supports a kiln body of a rotary kiln. The adjusting device includes a first detection unit that detects an extrusion force received by a bearing of the support roller, a second detection unit that detects a thrust force received by the bearing, an intermediate bed on which the bearing is placed, a cylinder that pushes and supports the intermediate bed, and a control device. The control device is configured to control the pushing amount of the cylinder based on signals detected by the first and second detection units.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a horizontally placed cylindrical body rotating device such as a rotary kiln, the cylindrical main body (for example, the kiln body) is itself a fairly heavy object. Also, during operation, materials flow inside the horizontally placed cylindrical body. Therefore, an extremely large load always acts on the support roller that supports the horizontally placed cylindrical body. Thus, there is a concern that damage such as cracks may occur in the roller shaft of the support roller along with long-term operation.

[0005] Therefore, the present disclosure describes an inspection apparatus and an inspection method capable of inspecting the damaged state of the roller shaft of the support roller.

Means for Solving the Problems

[0006] An example of an inspection device includes a first measuring unit configured to measure radial displacement at a predetermined first position on the circumferential surface of the support roller supporting the cylindrical body of a horizontally mounted cylindrical rotating device or on the circumferential surface of the roller shaft of the support roller; a second measuring unit configured to measure radial displacement at a predetermined second position on the circumferential surface of the support roller or on the circumferential surface of the roller shaft; and a control unit. The control unit is configured to perform a first process of calculating difference data, which is the difference between first time-series data of radial displacement measured by the first measuring unit and second time-series data of radial displacement measured by the second measuring unit, and a second process of determining the damage state of the roller shaft based on the difference data. [Effects of the Invention]

[0007] According to the inspection device and inspection method described herein, it is possible to inspect the condition of damage to the roller shaft of a support roller. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a schematic diagram showing a horizontal cylindrical rotating device, which is an example of an object to be inspected by the inspection device, viewed from the side. [Figure 2] Figure 2 is a cross-sectional view taken along line II-II in Figure 1. [Figure 3] Figure 3 is a schematic diagram showing the tires and support rollers of the horizontal cylindrical rotating device shown in Figure 1, and an example of the inspection device viewed from the side. [Figure 4] Figure 4 is a graph showing an example of the time-series data of radial displacement at the central part of the support roller's circumferential surface, the time-series data of radial displacement at one end of the support roller's circumferential surface, and the difference between these time-series data for one rotation of the tire of the horizontally mounted cylindrical rotating device shown in Figure 1. [Figure 5] Figure 5 is a graph showing an example of the time-series data of radial displacement at the central part of the support roller's circumferential surface, the time-series data of radial displacement at the other end of the support roller's circumferential surface, and the difference between these time-series data for one rotation of the tire of the horizontally mounted cylindrical rotating device shown in Figure 1. [Figure 6]Figure 6 is a schematic diagram showing the tires and support rollers of the horizontal cylindrical rotating device shown in Figure 1, and another example of the inspection device viewed from the side. [Figure 7] Figure 7 is a schematic diagram showing the tires and support rollers of the horizontal cylindrical rotating device shown in Figure 1, and another example of the inspection device viewed from the side. [Figure 8] Figure 8 is a schematic diagram showing the tires and support rollers of the horizontal cylindrical rotating device shown in Figure 1, and another example of the inspection device viewed from the side. [Modes for carrying out the invention]

[0009] In the following descriptions, the same reference numeral will be used for elements that are identical or have the same function, and redundant explanations will be omitted. In this specification, when referring to the top, bottom, right, and left of a figure, the direction of the reference numeral in the figure will be used as the reference. Some drawings show a Cartesian coordinate system defined by the X, Y, and Z axes. In this specification, the X axis is the axis extending in the longitudinal direction of the cylindrical body 10, which will be described later, the Y axis is the axis perpendicular to the X axis and extending horizontally, and the Z axis is the axis extending in a direction perpendicular to both the X and Y axes.

[0010] [Configuration of a horizontally mounted cylindrical rotating device] First, the configuration of the horizontal cylindrical rotating device 1 will be described with reference to Figures 1 to 3. The horizontal cylindrical rotating device 1 is configured to heat-treat a material (for example, firing, drying, cooling, etc.) by rotating a cylindrical body 10 and passing the material through the inside of the cylindrical body 10. The horizontal cylindrical rotating device 1 may be, for example, a rotary kiln, rotary dryer, rotary cooler, etc. The horizontal cylindrical rotating device 1 comprises a cylindrical body 10, a girth gear 20, a plurality of tires 30, a drive unit 40, and a plurality of support units 50.

[0011] The cylindrical body 10 is a long object with a roughly cylindrical shape. The diameter of the cylindrical body 10 may be, for example, several meters. The total length of the cylindrical body 10 may be, for example, 60m to 100m.

[0012] The cylindrical body 10 includes an outer shell 10a and a refractory material 10b, as illustrated in Figure 2. The outer shell 10a has a substantially cylindrical shape and may be made of a steel material such as carbon steel. The refractory material 10b is arranged entirely on the inner circumferential surface of the outer shell 10a and may be made of refractory bricks, for example. Therefore, the material passing through the cylindrical body 10 is heat-treated in the internal space of the refractory material 10b. As illustrated in Figure 1, the opening at one end of the cylindrical body 10 into which the material is introduced becomes the input port 11, and the opening at the other end of the cylindrical body 10 into which the material is discharged becomes the discharge port 12.

[0013] The cylindrical body 10 may be installed so that its X-axis is inclined with respect to the horizontal direction, as illustrated in Figure 1, or it may be installed so that its X-axis extends along the horizontal direction. In the example in Figure 1, the cylindrical body 10 is inclined downward from the inlet 11 to the outlet 12.

[0014] The girth gear 20 is provided on the outer circumferential surface of the cylindrical body 10 so as to extend along the circumferential direction of the cylindrical body 10. Therefore, the girth gear 20 has a substantially annular shape. The girth gear 20 has a gear shape in which the bumps and grooves are arranged alternately in its circumferential direction. The girth gear 20 may be made of a steel material such as alloy steel, carbon steel, or stainless steel. As illustrated in Figure 1, the girth gear 20 may be located closer to the input port 11 of the cylindrical body 10 in the X-axis direction. Multiple girth gears 20 may be provided on the outer circumferential surface of the cylindrical body 10.

[0015] Each of the multiple tires 30 is provided on the outer circumferential surface of the cylindrical body 10 so as to extend along the circumferential direction of the cylindrical body 10. Therefore, each of the multiple tires 30 has a substantially annular shape. The multiple tires 30 are arranged at predetermined intervals in the X-axis direction. The intervals between the multiple tires 30 may be substantially constant or may vary. The tires 30 may be made of steel material such as cast steel or forged steel. The outer circumferential surface of the tires 30 may be smoothed to reduce frictional resistance. As illustrated in Figure 1, the horizontal cylindrical rotating device 1 may be equipped with four tires 30.

[0016] As illustrated in FIG. 1, the drive unit 40 includes a pedestal 41, a pair of supports 42, a pinion gear 43, and a drive source 44. The pedestal 41 is configured to support the pair of supports 42. The pair of supports 42 are provided on the pedestal 41 so as to face each other with the pinion gear 43 therebetween. The pair of supports 42 are configured to rotatably hold the rotation axis 43a of the pinion gear 43.

[0017] The pinion gear 43 has a gear shape in which concavities and convexities are arranged alternately in its circumferential direction, and is arranged to mesh with the rack gear 20. The pinion gear 43 is configured to transmit the rotational force to the rack gear 20 by meshing with the rack gear 20. The position where the pinion gear 43 and the rack gear 20 mesh is below and to the side of the cylindrical main body 10 in the example of FIG. 1, but is not particularly limited thereto.

[0018] The drive source 44 operates based on a drive signal from the controller Ctr, and is configured to rotationally drive the rotation axis 43a of the pinion gear 43. The drive source 44 may be, for example, an electric motor. With the operation of the drive source 44, the power of the drive source 44 is transmitted to the cylindrical main body 10 via the rotation axis 43a, the pinion gear 43, and the rack gear 20, and the cylindrical main body 10 rotates around the rotation center axis Ax extending along the X-axis direction.

[0019] Each of the plurality of support portions 50 is configured to support the corresponding tire 30 among the plurality of tires 30. As illustrated in FIGS. 1 to 3, the support portion 50 includes a pedestal 51 and a roller portion 52. The pedestal 51 is configured to support the roller portion 52. As illustrated in FIGS. 1 and 2, the support portion 50 may include a pair of roller portions 52A and 52B.

[0020] The roller section 52 includes a pair of support members 52a, a support roller 52b, and a roller shaft 52c, as illustrated in Figures 1 and 2. The pair of support members 52a are mounted on a base 51 so as to face each other with the support roller 52b in between. The pair of support members 52a are configured to allow adjustment of their installation position in the Y-axis direction by attaching and detaching position adjustment bolts (not shown), as illustrated by the arrow Ar in Figure 2.

[0021] The support roller 52b is configured to support the tire 30 by directly contacting it. Specifically, the outer circumferential surface of the support roller 52b is in direct contact with the outer circumferential surface of the tire 30. The outer circumferential surface of the support roller 52b may be smoothed to reduce frictional resistance. The roller shaft 52c is fixed to the support roller 52b so as to pass through the center of the support roller 52b. As illustrated in Figure 3, the support roller 52b is located at the center of the roller shaft 52c. Both ends of the roller shaft 52c are rotatably held relative to a pair of supports 52a.

[0022] Here, the roller sections 52A and 52B may be arranged in the Y-axis direction with the rotational axis Ax between them, as illustrated in Figure 2. That is, the tire 30 may be supported on both sides of its lower part by the support rollers 52b of the roller sections 52A and 52B.

[0023] [Configuration of the inspection device] Next, the configuration of the inspection device 2 will be described with reference to Figures 3 to 5. The inspection device 2 comprises a plurality of measuring units 3 and a controller Ctr (control unit).

[0024] The measuring unit 3 is positioned facing the circumferential surface of the support roller 52b and is configured to measure the radial displacement of the circumferential surface of the support roller 52b. The measuring unit 3 may be, for example, a non-contact type displacement sensor (e.g., a laser type displacement sensor) or a contact type displacement sensor. The measuring unit 3 is configured to operate based on instruction signals from the controller Ctr. The measuring unit 3 is configured to transmit the measured data to the controller Ctr.

[0025] As illustrated in Figure 3, the inspection device 2 may be equipped with three measuring units 3A to 3C. Measuring unit 3A may measure the central part R1 (first position) of the circumferential surface of the support roller 52b in the axial direction D of the roller shaft 52c. Figures 4 and 5 illustrate the time-series data T1 (first time-series data) of the radial displacement of the central part R1 measured by measuring unit 3A over one rotation of the cylindrical body 10.

[0026] The measuring unit 3B may measure one end R2 (second position) of the circumferential surface of the support roller 52b in the axial direction D. The position of the end R2 measured by the measuring unit 3B may be approximately 50 mm to 100 mm inward in the axial direction D from one end face of the support roller 52b. Figure 4 illustrates the time-series data T2 (second time-series data) of the radial displacement of the end R2 measured by the measuring unit 3B over one rotation of the cylindrical body 10.

[0027] The measuring unit 3C may measure the other end R3 (third position) of the circumferential surface of the support roller 52b in the axial direction D. The position of the other end R3 measured by the measuring unit 3C may be approximately 50 mm to 100 mm inward in the axial direction D from the other end face of the support roller 52b. Figure 5 illustrates the time-series data T3 (third time-series data) of the radial displacement of the other end R3 measured by the measuring unit 3C over one rotation of the cylindrical body 10.

[0028] If the roller shaft 52c is damaged, the roller shaft 52c will bend in its axial direction, starting from the point of damage. Therefore, compared with the time-dependent data T1 at the central part R1 of the support roller 52b, the time-dependent data T2 at one end R2 of the support roller 52b and the time-dependent data T3 at the other end R3 of the support roller 52b tend to be higher than the time-dependent data T1, while the other tends to be lower than the time-dependent data T1.

[0029] The measuring unit 3 may be composed of a single measuring device. That is, a single measuring device may include multiple measuring units 3. The measuring unit 3 may be composed of multiple measuring devices. That is, each of the multiple measuring units 3 may be composed of a measuring device.

[0030] The controller Ctr is configured to control the measuring unit 3. The controller Ctr generates instruction signals to operate the measuring unit 3 based on, for example, a program recorded on a recording medium (not shown) or operation input from an operator, and transmits these instruction signals to each of them.

[0031] The inspection device 2 may have one controller Ctr, or it may have a controller group (control unit) composed of multiple controllers Ctr. If the inspection device 2 has a controller group, the control of the measurement unit 3 may be realized by one controller Ctr, or by a combination of two or more controllers Ctr.

[0032] The controller Ctr is configured to calculate differential data ΔT1 (see Figure 4), which is the difference between the time-series data T1 of radial displacement at the central part R1 measured by the measurement unit 3A and the time-series data T2 of radial displacement at one end R2 measured by the measurement unit 3B. As a result, the differential data ΔT1 mainly includes the axial damage component, due to the difference between the time-series data T1 which mainly includes the load fluctuation component and the time-series data T2 which includes the load fluctuation component and the axial damage component.

[0033] The controller Ctr is configured to calculate difference data ΔT2 (another difference data) (see Figure 5), which is the difference between the time-series data T1 of radial displacement at the central part R1 measured by the measurement unit 3A and the time-series data T3 of radial displacement at the other end R3 measured by the measurement unit 3C. As a result, the difference data ΔT2 mainly includes the axial damage component, due to the difference between the time-series data T1, which mainly includes the load fluctuation component, and the time-series data T3, which includes the load fluctuation component and the axial damage component.

[0034] The controller Ctr is configured to determine the damage status of the roller shaft 52c based on the difference data ΔT1 and ΔT2. When there is damage such as a crack in the roller shaft 52c, the load from the cylindrical body 10 acting on the roller shaft 52c makes the roller shaft 52c more likely to bend radially toward the damaged side. Therefore, the maximum values ​​of the waveforms of the difference data ΔT1 and ΔT2 become relatively large at the location where the roller shaft 52c is damaged. Accordingly, the controller Ctr determines that there is damage to the roller shaft 52c at the location where the maximum values ​​of the waveforms of the difference data ΔT1 and ΔT2 are greater than a predetermined threshold.

[0035] [Effect] In the above example, the difference data ΔT1 is calculated, which is the difference between two time-series data points T1 and T2 measured at different positions on the circumferential surface of the support roller 52b. As a result, in the difference data ΔT1, the load fluctuation component is suppressed, and the shaft damage component becomes clear. Therefore, by determining the damage state of the roller shaft 52c based on the difference data ΔT1, it becomes possible to inspect the damage state of the roller shaft 52c.

[0036] As shown in the above example, the measurement unit 3A measures the central part R1 of the circumferential surface of the support roller 52b in the axial direction of the roller shaft, and the load fluctuation component is most likely to occur in the radial displacement at the central part R1. Therefore, the sensitivity of the load fluctuation component included in the time-series data T1 is high. Also, the measurement unit 3B measures the end part R2 of the circumferential surface of the support roller 52b in the axial direction of the roller shaft, and if damage exists near the end part R2 of the roller shaft 52c, the shaft damage component is most likely to occur in the radial displacement at the end part R2. Therefore, the sensitivity of the shaft damage component included in the time-series data T2 is high. Consequently, by calculating the difference data ΔT1, the load fluctuation component is further suppressed in the difference data ΔT1, and the shaft damage component becomes even clearer. As a result, it becomes possible to inspect the damage state of the roller shaft 52c near the end part R2 of the support roller 52b with greater accuracy.

[0037] As shown in the above example, the measuring unit 3C measures the other end R3 of the circumferential surface of the support roller 52b in the axial direction of the roller shaft. When damage exists near the other end R3 of the roller shaft 52c, the radial displacement at the other end R3 is most likely to produce the axial damage component. Therefore, the sensitivity of the axial damage component included in the time-series data T3 is high. Consequently, by calculating the difference data ΔT2, the load fluctuation component is further suppressed in the difference data ΔT2, and the axial damage component becomes even clearer. As a result, it becomes possible to inspect the damage state near the other end R3 of the support roller 52b of the roller shaft 52c with greater accuracy.

[0038] [Differentiation] The disclosures herein should be considered in all respects to be illustrative and not restrictive. Various omissions, substitutions, and modifications may be made to the above examples without departing from the claims and the gist thereof.

[0039] (1) When calculating the difference data ΔT1 and ΔT2, the time-series data T1 to T3 may include the change in radial displacement over time for at least one rotation of the roller shaft 52c. In this case, it becomes possible to determine whether or not the roller shaft 52c is damaged and the location of any damage to the roller shaft 52c based on the difference data ΔT1 and ΔT2.

[0040] (2) As illustrated in Figure 6, the measuring unit 3B may measure the portion R4 on one end of the circumferential surface of the roller shaft 52c in the axial direction D. The measuring unit 3C may measure the portion R5 on the other end of the circumferential surface of the roller shaft 52c in the axial direction D.

[0041] The controller Ctr may calculate differential data ΔT3 (not shown), which is the difference between the time-series data T1 of the radial displacement at the central part R1 measured by the measuring unit 3A and the time-series data T4 (not shown) of the radial displacement at part R4 on one end side of the roller shaft 52c measured by the measuring unit 3B. In this case as well, the differential data ΔT3 will mainly include the shaft damage component, as it is the difference between the time-series data T1 which mainly includes the load fluctuation component and the time-series data T4 which includes the load fluctuation component and the shaft damage component.

[0042] The controller Ctr may calculate differential data ΔT4 (not shown), which is the difference between the time-series data T1 of the radial displacement at the central part R1 measured by the measuring unit 3A and the time-series data T5 (not shown) of the radial displacement at the other end part R5 of the roller shaft 52c measured by the measuring unit 3C. In this case as well, the differential data ΔT4 will mainly include the shaft damage component, as it is the difference between the time-series data T1 which mainly includes the load fluctuation component and the time-series data T5 which includes the load fluctuation component and the shaft damage component.

[0043] The controller Ctr may determine the damage status of the roller shaft 52c based on the differential data ΔT3 and ΔT4, similar to the example described above. The controller Ctr may also determine that damage exists in the roller shaft 52c at the position where the maximum value of the waveforms of the differential data ΔT3 and ΔT4 is greater than a predetermined threshold.

[0044] (3) As illustrated in Figure 7, the measuring unit 3B may measure a portion R6 of the axial end face of the roller shaft 52c. The portion R6 measured by the measuring unit 3B may be located on the axial end face of the roller shaft 52c, away from the center of the roller shaft 52c, or it may be located on the axial end face of the roller shaft 52c, near the radial outer surface of the roller shaft 52c.

[0045] The measuring unit 3C may measure portion R7 of the other axial end face of the roller shaft 52c. The portion R7 measured by the measuring unit 3C may be located on the other axial end face of the roller shaft 52c, away from the center of the roller shaft 52c, or it may be located on the other axial end face of the roller shaft 52c, near the radial outer surface of the roller shaft 52c.

[0046] In this case as well, the controller Ctr may determine the damage status of the roller shaft 52c based on the difference data, which is the difference in time-series data measured by the measuring units 3A and 3B, and the difference data, which is the difference in time-series data measured by the measuring units 3A and 3C.

[0047] (4) As illustrated in Figure 8, the measuring unit 3B may measure a portion R8 of the axial end face of the support roller 52b. The portion R8 measured by the measuring unit 3B may be located on the axial end face of the support roller 52bc, away from the center of the support roller 52b, or it may be located on the axial end face of the support roller 52b, near the radial outer surface of the support roller 52b.

[0048] The measuring unit 3C may measure portion R9 of the other axial end face of the support roller 52b. The portion R9 measured by the measuring unit 3C may be located on the other axial end face of the support roller 52b, away from the center of the support roller 52b, or it may be located on the other axial end face of the support roller 52b, near the radial outer surface of the support roller 52b.

[0049] In this case as well, the controller Ctr may determine the damage status of the roller shaft 52c based on the difference data, which is the difference in time-series data measured by the measuring units 3A and 3B, and the difference data, which is the difference in time-series data measured by the measuring units 3A and 3C.

[0050] [Other examples] Example 1. An example of an inspection device comprises a first measuring unit configured to measure radial displacement at a predetermined first position on the circumferential surface of the support roller supporting the cylindrical body of a horizontally mounted cylindrical rotating device or on the circumferential surface of the roller shaft of the support roller; a second measuring unit configured to measure radial displacement at a predetermined second position on the circumferential surface of the support roller or on the circumferential surface of the roller shaft; and a control unit. The control unit is configured to perform a first process of calculating difference data, which is the difference between first time-series data of radial displacement measured by the first measuring unit and second time-series data of radial displacement measured by the second measuring unit, and a second process of determining the damage state of the roller shaft based on the difference data.

[0051] Incidentally, if damage such as a crack occurs in the roller shaft, the load acting from the cylindrical body on the support roller causes the support roller and roller shaft to bend axially, starting from the point of damage. As a result, the radial displacement of the circumferential surface of the support roller or the roller shaft becomes larger compared to a state without damage. Therefore, it seems possible to understand the state of the damage (location of damage, size of damage, etc.) by measuring the radial displacement of the circumferential surface of the support roller or the roller shaft at multiple points while the support roller is rotating.

[0052] However, horizontal cylindrical rotating devices (e.g., rotary kilns, rotary dryers, rotary coolers, etc.) are devices that process materials (e.g., firing, drying, cooling, etc.) by passing them through the interior of a cylindrical body while rotating the body. Due to the processing of the material, the inside of the cylindrical body reaches high temperatures of several hundred to 1600°C. During the processing of the material, the total weight of the movable elements such as the cylindrical body of the horizontal cylindrical rotating device, along with the material, can reach approximately 3000 to 4000 tons. In addition, during the processing of the material, the cylindrical body rotates while being supported by support parts at several points along its longitudinal direction. As a result of the high temperatures and large loads acting on the cylindrical body, the cylindrical body may deform or be displaced (shifted position) due to the effects of thermal stress and loads as the operating time of the horizontal cylindrical rotating device progresses. When these deformations and displacements become large, the load acting from the cylindrical body on the support roller fluctuates significantly during the rotation of the support roller as the cylindrical body rotates. As a result, the radial displacement of the circumferential surface of the support roller or the roller shaft contains a mixture of components originating from damage to the roller shaft (sometimes referred to as the "shaft damage component" in this document) and components originating from load fluctuations from the cylindrical body (sometimes referred to as the "load fluctuation component" in this document). Therefore, simply measuring the radial displacement of the circumferential surface of the support roller or the roller shaft is insufficient to determine the condition of the roller shaft.

[0053] Therefore, according to Example 1, differential data is calculated, which is the difference between two time-series data measured at different locations on the circumferential surface of the support roller or the circumferential surface of the roller shaft of the support roller. The shaft damage component of the radial displacement of the circumferential surface of the support roller or the roller shaft tends to increase as it approaches the actual damage. On the other hand, the load fluctuation component of the radial displacement of the circumferential surface of the support roller or the roller shaft tends to be approximately the same at any position on the support roller and the roller shaft in the axial direction. Therefore, by calculating differential data, the load fluctuation component is suppressed in the differential data, and the shaft damage component becomes clearer. Consequently, by judging the damage state of the roller shaft based on the differential data, it becomes possible to inspect the damage state of the roller shaft of the support roller.

[0054] Example 2. In the apparatus of Example 1, the first position may be the central part of the support roller's circumferential surface in the axial direction of the roller shaft, and the second position may be one end of the support roller's circumferential surface in the axial direction. Incidentally, the load fluctuation component is most likely to occur as radial displacement in the central part of the support roller's circumferential surface in the axial direction of the roller shaft. Therefore, by selecting the central part of the support roller's circumferential surface in the axial direction of the roller shaft as the first position, the sensitivity of the load fluctuation component included in the first time-series data is increased. Also, the point where the load is most concentrated on the roller shaft is the position of the roller shaft corresponding to the vicinity of the end face of the support roller. Therefore, by selecting one end of the support roller's circumferential surface in the axial direction as the second position, the sensitivity of the shaft damage component included in the second time-series data is increased. Consequently, by calculating the difference data, the load fluctuation component is further suppressed in the difference data, and the shaft damage component becomes even clearer. As a result, it becomes possible to inspect the damage state of the roller shaft near one end of the support roller with greater accuracy.

[0055] Example 3. The apparatus of Example 2 further comprises a third measuring unit configured to measure the radial displacement of the other end of the support roller in the axial direction on the circumferential surface, and the control unit is configured to further perform a third process that calculates another difference data, which is the difference between a first time-series data of radial displacement measured by the first measuring unit and a third time-series data of radial displacement measured by the third measuring unit, and the second process may include determining the damage state of the roller shaft based on the difference data and the other difference data. In this case, for the same reasons as in Example 2, it becomes possible to inspect the damage state of the roller shaft near one end of the support roller and the damage state of the roller shaft near the other end of the support roller with greater accuracy.

[0056] Example 4. In the apparatus of Example 1, the first position may be the central part of the circumferential surface of the support roller in the axial direction of the roller shaft, and the second position may be the part of the circumferential surface of the roller shaft on one end in the axial direction. In this case, the same effects and advantages as the apparatus of Example 2 can be obtained.

[0057] Example 5. The apparatus of Example 4 further comprises a third measuring unit configured to measure the radial displacement of the portion of the circumferential surface of the roller shaft on the other end side in the axial direction, and the control unit is configured to further perform a third process that calculates another difference data which is the difference between a first time-series data of radial displacement measured by the first measuring unit and a third time-series data of radial displacement measured by the third measuring unit, and the second process may include determining the damage state of the roller shaft based on the difference data and the other difference data. In this case, the same effects as the apparatus of Example 3 can be obtained.

[0058] Example 6. An example of an inspection method includes: a first step of measuring the radial displacement at a predetermined first position on the circumferential surface of the support roller or the circumferential surface of the roller shaft of the horizontally mounted cylindrical rotating device; a second step of measuring the radial displacement at a predetermined second position on the circumferential surface of the support roller or the circumferential surface of the roller shaft; a third step of calculating difference data, which is the difference between the first time-series data of the radial displacement measured in the first step and the second time-series data of the radial displacement measured in the second step; and a fourth step of determining the damage state of the roller shaft based on the difference data. In this case, the same effects and advantages as the device in Example 1 can be obtained. [Explanation of symbols]

[0059] 1... Horizontal cylindrical rotating device, 2... Inspection device, 3... Measurement unit, 3A... Measurement unit (first measurement unit), 3B... Measurement unit (second measurement unit), 3C... Measurement unit (third measurement unit), 10... Cylindrical body, 52b... Support roller, 52c... Roller shaft, Ctr... Controller (control unit), R1... Center part (first position), R2... One end (second position), R3... Other end (third position), R4... Part on one end side, R5... Part on the other end side, T1... Time-series data (first time-series data), T2... Time-series data (second time-series data), T3... Time-series data (third time-series data), ΔT1... Difference data, ΔT2... Difference data (another difference data).

Claims

1. A first measuring unit configured to measure radial displacement at a predetermined first position on the circumferential surface of the support roller supporting the cylindrical body of a horizontally mounted cylindrical rotating device or on the circumferential surface of the roller shaft of the support roller, A second measuring unit configured to measure radial displacement at a predetermined second position on the circumferential surface of the support roller or the circumferential surface of the roller shaft, It includes a control unit, The control unit, A first process for calculating difference data, which is the difference between first time-series data of radial displacement measured by the first measuring unit and second time-series data of radial displacement measured by the second measuring unit, An inspection device configured to perform a second process of determining the damage state of the roller shaft based on the differential data.

2. The first position is the central part of the circumferential surface of the support roller in the axial direction of the roller shaft, The apparatus according to claim 1, wherein the second position is one end of the circumferential surface of the support roller in the axial direction.

3. The support roller further comprises a third measuring unit configured to measure the radial displacement of the other end of the circumferential surface of the support roller in the axial direction, The control unit is configured to further perform a third process, which calculates another difference data, which is the difference between the first time-series data of radial displacement measured by the first measuring unit and the third time-series data of radial displacement measured by the third measuring unit. The apparatus according to claim 2, wherein the second process includes determining the damage state of the roller shaft based on the differential data and the other differential data.

4. The first position is the central part of the circumferential surface of the support roller in the axial direction of the roller shaft, The apparatus according to claim 1, wherein the second position is the portion of the circumferential surface of the roller shaft that is on one end side in the axial direction.

5. The roller shaft further comprises a third measuring unit configured to measure the radial displacement of the portion of the circumferential surface of the roller shaft that is on the other end side in the axial direction, The control unit is configured to further perform a third process, which calculates another difference data, which is the difference between the first time-series data of radial displacement measured by the first measuring unit and the third time-series data of radial displacement measured by the third measuring unit. The apparatus according to claim 4, wherein the second process includes determining the damage state of the roller shaft based on the differential data and the other differential data.

6. A first step of measuring the radial displacement at a predetermined first position on the circumferential surface of the support roller that supports the cylindrical body of the horizontally mounted cylindrical rotating device or on the circumferential surface of the roller shaft of the support roller, A second step of measuring the radial displacement at a predetermined second position on the circumferential surface of the support roller or the circumferential surface of the roller shaft, A third step involves calculating difference data, which is the difference between the first time-series data of radial displacement measured in the first step and the second time-series data of radial displacement measured in the second step. An inspection method comprising a fourth step of determining the damage state of the roller shaft based on the difference data.

Images