Evaluation device and evaluation method

Abstract

The evaluation device (10) includes: an acquisition unit (601) for acquiring first three-dimensional shape data of a ring-connected flange (30); and an evaluation unit (603) for evaluating the state of a ring-connected groove formed on the flange surface of the flange based on the first three-dimensional shape data. The evaluation unit (603) includes: a shape measuring unit (611) for measuring a plurality of first shape parameters related to the shape of the ring-connected groove; a detection unit (615) for detecting scratches generated in the object area of ​​the ring-connected groove; a strain measuring unit (617) for measuring the first strain of a first contact surface of the ring-connected groove, wherein a ring-connected gasket (40) is in contact with the first contact surface; and a judgment unit (619) for determining whether repair of the ring-connected groove is required based on at least one of the plurality of first shape parameters, scratches, and the first strain.

Description

Technical Field

[0001] This disclosure relates to an evaluation device and an evaluation method. Background Technology

[0002] Previously, the following techniques were known: using a portable, non-contact three-dimensional coordinate measuring device to measure the strain of a flange. For example, Japanese Patent Application Publication No. 2017-227459 (Patent Document 1) discloses the following technique: in the strain measurement of the flange face, the space required for measurement is small, and the measurement accuracy is not reduced even in the field where vibration is occurring; it measures not only the data of undulation but also the data of the inclination of the flange face.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-227459 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] One cause of fluid leakage from flanges is likely the deterioration or damage of gaskets used at piping joints, thus requiring regular gasket replacement by operators. At this time, operators visually inspect and palpate the flange face to assess its condition. If repair is deemed necessary, appropriate work (such as grinding) is performed. For example, in ring joint type flanges using ring joint gaskets, assessing the condition of the flange face with the ring joint groove and determining whether repair is required depends on the operator's technical knowledge and experience, leading to inconsistencies. Furthermore, operators lacking knowledge and experience often fail to make the aforementioned assessment of repair needs even after inspecting the flange face (ring joint groove).

[0008] One aspect of this disclosure is to provide an evaluation device and method for determining whether repair of a ring connection groove formed on a flange surface is necessary.

[0009] Solution for solving the problem

[0010] An evaluation apparatus according to one embodiment includes: an acquisition unit that acquires first three-dimensional shape data of a ring-connected flange; and an evaluation unit that evaluates the state of a ring-connected groove formed on the flange surface of the flange based on the first three-dimensional shape data. The evaluation unit includes: a shape measuring unit that measures a plurality of first shape parameters related to the shape of the ring-connected groove; a detection unit that detects scratches generated in an object area of ​​the ring-connected groove; a strain measuring unit that measures a first strain of a first contact surface of the ring-connected groove, wherein a ring-connected gasket is in contact with the first contact surface; and a determination unit that determines whether repair of the ring-connected groove is necessary based on at least one of the plurality of first shape parameters, scratches, and the first strain.

[0011] Preferably, when at least one of the multiple first shape parameters is outside the reference range, when the length of the scratch is greater than or equal to the first length, when the first strain is greater than or equal to the first threshold, or when the length of the scratch is less than the first length and the depth of the scratch is greater than or equal to the first depth, the determination unit determines that the ring connection groove is in a state that needs repair.

[0012] Preferably, the plurality of first shape parameters include the angle between the centerline representing the center of the annular connecting groove and the first contact surface, as well as the width and depth of the annular connecting groove.

[0013] Preferably, the evaluation device further includes an output control unit that outputs suggestion information to the user based on the judgment result of the judgment unit. The output control unit outputs information recommending cutting or grinding the ring connection groove based on the judgment result that the ring connection groove is in a state requiring repair.

[0014] Preferably, when the detection unit detects a first scratch and a second scratch that are close to each other in the target area, it merges the first scratch and the second scratch into a single scratch.

[0015] Preferably, the strain measuring unit measures the first strain in the radial and circumferential directions of the flange.

[0016] Preferably, the target area is a specified area in the first contact surface of the ring connecting groove or the entire area of ​​the first contact surface.

[0017] Preferably, the acquisition unit also acquires second three-dimensional shape data of the ring connection gasket. The evaluation unit further evaluates the condition of the ring connection gasket based on the second three-dimensional shape data. The shape measurement unit further measures multiple second shape parameters related to the shape of the ring connection gasket. The detection unit further detects scratches on the second contact surface of the ring connection gasket, wherein the ring connection groove contacts the second contact surface. The strain measurement unit further measures the second strain of the second contact surface. The judgment unit further determines whether the ring connection gasket needs to be replaced based on at least one of the multiple second shape parameters, the scratches on the second contact surface, and the second strain.

[0018] Preferably, the determination unit determines that the ring connection gasket needs to be replaced when at least one of the multiple second shape parameters is outside the reference range, when the length of the scratch on the second contact surface is greater than or equal to the second length, when the second strain is greater than or equal to the second threshold, or when the length of the scratch on the second contact surface is less than the second length and the depth of the scratch on the second contact surface is greater than or equal to the second depth.

[0019] Preferably, the multiple second shape parameters include the center diameter, height, and width of the ring connecting gasket.

[0020] Preferably, the strain measurement unit calculates a third strain in the area where the ring connection gasket is embedded in the ring connection groove based on the first strain and the second strain. If the third strain is above a third threshold, the determination unit determines that at least one of repairing the ring connection groove and replacing the ring connection gasket is required.

[0021] Preferably, the acquisition unit also acquires third-dimensional shape data of the flange fastening body after the flange and other flanges are fastened together via a ring connection gasket. The evaluation unit also includes a clearance measurement unit, which measures the clearance between the flange and other flanges in the flange fastening body based on the third-dimensional shape data. If the clearance is above a predetermined value, the determination unit determines that at least one of the ring connection groove of the flange, the ring connection groove of the other flange, and the ring connection gasket is abnormal.

[0022] An evaluation method according to another embodiment includes the following steps: acquiring first three-dimensional shape data of a ring-connected flange; and evaluating the condition of a ring-connected groove formed on the flange face based on the first three-dimensional shape data. The evaluation steps include: measuring a plurality of first shape parameters related to the shape of the ring-connected groove; detecting scratches generated in the object area of ​​the ring-connected groove; measuring a first strain of a first contact surface of the ring-connected groove, wherein a ring-connected gasket contacts the first contact surface; and determining whether repair of the ring-connected groove is necessary based on at least one of the plurality of first shape parameters, scratches, and the first strain.

[0023] The effects of the invention

[0024] According to this disclosure, it is possible to determine whether the ring connection groove formed on the flange face needs to be repaired. Attached Figure Description

[0025] Figure 1 It is a diagram used to illustrate the overall structure of the evaluation system.

[0026] Figure 2 This is a block diagram illustrating an example of the hardware structure of an evaluation device.

[0027] Figure 3 This is a flowchart illustrating an example of the actions of an evaluation system.

[0028] Figure 4 This is a diagram showing the flange fasteners.

[0029] Figure 5 This is a diagram illustrating how the shape parameters of the ring connection groove of a flange are measured.

[0030] Figure 6 This is a diagram illustrating how the length of the scratch in the ring connection groove is calculated.

[0031] Figure 7 This diagram illustrates how multiple scars can be combined.

[0032] Figure 8 This is a diagram illustrating how the depth of the scratch in the ring connection groove is calculated.

[0033] Figure 9 This is a diagram used to illustrate how the radial strain of a ring connection groove is measured.

[0034] Figure 10 This is a diagram used to illustrate the method for measuring the circumferential strain of a ring connection groove.

[0035] Figure 11 This is a diagram used to illustrate how the shape parameters of a gasket are measured.

[0036] Figure 12 This is a diagram used to illustrate how the object area of ​​the gasket is set.

[0037] Figure 13 This is a diagram illustrating how the length of a gasket's scratch is calculated.

[0038] Figure 14 This is a diagram illustrating how the depth of a gasket's scratch is calculated.

[0039] Figure 15 This is a diagram illustrating how the radial strain of a gasket is measured.

[0040] Figure 16 This is a diagram used to illustrate how the circumferential strain of a gasket is measured.

[0041] Figure 17 This is a diagram used to illustrate the method of measuring strain at fastened parts.

[0042] Figure 18 This is another example of a method for measuring the strain of a fastener.

[0043] Figure 19This is a block diagram illustrating an example of the functional structure of an evaluation device. Detailed Implementation

[0044] Hereinafter, this embodiment will be described with reference to the accompanying drawings. In the following description, the same reference numerals will be used to refer to the same parts. Their names and functions are also the same. Therefore, detailed descriptions of them will not be repeated.

[0045] <System Structure>

[0046] Figure 1 This is a diagram used to illustrate the overall structure of the evaluation system. (Refer to...) Figure 1 The evaluation system 1000 is a system for evaluating the condition of the flange face (flange seat face) of the flange 30. The flange 30 is a ring-connection type flange having a ring-connection seat face as the flange seat face. Thus, the flange 30 is configured to allow a ring-connection gasket to be inserted.

[0047] The evaluation system 1000 includes an evaluation device 10 and a 3D scanner 20. Furthermore, in this embodiment, the following scenario is envisioned: an operator, as a user of the evaluation device 10, uses the 3D scanner 20 to evaluate the condition of the flange face of the flange 30, for example, when replacing a used seal used for fastening the flange 30 with a new, unused seal. The seal involved in this embodiment is a ring connection gasket 40 (hereinafter also simply referred to as "gasket 40").

[0048] The gasket 40 is clamped into the portion where a pair of flanges 30 meet, and is secured by the bolts of the flanges 30, thereby preventing fluid leakage from the gaps in the flanges 30. The gasket 40 is a sealing element capable of sealing the gaps in the part where it is installed to make that part airtight.

[0049] The 3D scanner 20 is, for example, a portable, non-contact 3D scanner that acquires the three-dimensional shape data of an object (here, flange 30 and gasket 40) and outputs the acquired three-dimensional shape data. The 3D scanner 20 can use known methods such as laser beams or patterned light projection.

[0050] Flange 30 has an annular groove configured to receive a gasket 40. The gasket 40 fills the annular grooves of a pair of flanges 30 to provide a seal. When the fasteners are tightened, the gasket 40 is pressed into the annular groove, deforms, and seals the joint between one flange 30 and the other flange 30. The gasket 40 may be, for example, an octagonal annular gasket with an octagonal cross-section, or an elliptical annular gasket with an elliptical cross-section.

[0051] The evaluation device 10 acquires three-dimensional shape data from the 3D scanner 20 (i.e., accepts input of three-dimensional shape data). Typically, the evaluation device 10 is configured to communicate with the 3D scanner 20. In this embodiment, the evaluation device 10 evaluates the condition of the circumferential groove formed on the flange surface of the flange 30 based on the three-dimensional shape data of the flange 30 being evaluated, considering factors such as scratches and strain. Specifically, the evaluation device 10 determines whether repair of the circumferential groove is necessary and outputs suggested information related to the appropriate repair method.

[0052] Furthermore, the evaluation device 10 uses the three-dimensional shape data of the gasket 40, which is the object of evaluation, to determine whether the gasket 40 needs to be replaced based on defects such as scratches and strain on the gasket 40, and outputs suggestions related to the corresponding solutions. Additionally, the evaluation device 10 uses the three-dimensional shape data of both the flange 30 and the gasket 40, as well as the three-dimensional shape data of the fasteners of the flange 30 and the gasket 40, to determine any abnormalities in the flange 30 and the gasket 40, and outputs suggestions related to the corresponding solutions.

[0053] Typically, the evaluation device 10 has a structure according to a general computer architecture, and performs the various processes described below by executing pre-installed programs by a processor. The evaluation device 10 is, for example, a laptop PC (Personal Computer). However, the evaluation device 10 can be any device capable of performing the functions and processes described below, or other devices (e.g., desktop PC, tablet terminal device).

[0054] <Hardware Structure>

[0055] Figure 2 This is a block diagram illustrating an example of the hardware structure of the evaluation device. (Refer to...) Figure 2 The evaluation device 10 includes a processor 101, a memory 103, a display 105, an input device 107, an input / output interface (I / F) 109, and a communication interface (I / F) 111. These components are connected in a manner that enables them to communicate with each other.

[0056] The processor 101 is typically an arithmetic processing unit such as a CPU (Central Processing Unit) or MPU (Multi Processing Unit). The processor 101 controls the operation of each part of the evaluation device 10 by reading and executing a program stored in the memory 103. Specifically, the processor 101 implements the various functions of the evaluation device 10 by executing the program.

[0057] The memory 103 is implemented using RAM (Random Access Memory), ROM (Read-Only Memory), hard disk, SSD (Solid State Drive), etc. The memory 103 stores programs executed by the processor 101, three-dimensional shape data acquired by the 3D scanner 20, etc.

[0058] The display 105 may be, for example, a liquid crystal display (LCD) or an organic EL (Electro-luminescent) display. The display 105 may be integrally formed with the evaluation device 10 or separately formed from the evaluation device 10.

[0059] The input device 107 accepts operation input to the evaluation device 10. The input device 107 may be implemented as a keyboard, buttons, mouse, etc. Alternatively, the input device 107 may be implemented as a touch panel.

[0060] Input / output interface 109 mediates data transmission between processor 101 and 3D scanner 20. Input / output interface 109 is connected to 3D scanner 20, for example. Processor 101 acquires three-dimensional shape data measured by 3D scanner 20 via input / output interface 109.

[0061] The communication interface 111 mediates data transmission between the processor 101 and external devices. For example, wireless communication methods such as Bluetooth (registered trademark) or wireless LAN (Local Area Network) can be used. Alternatively, wired communication methods such as USB (Universal Serial Bus) can also be used. Furthermore, the processor 101 can also communicate with the 3D scanner 20 via the communication interface 111.

[0062] <Action Summary>

[0063] Figure 3 This is a flowchart illustrating an example of the actions involved in an evaluation system. (See reference...) Figure 3 The 3D scanner 20 generates three-dimensional shape data of a pair of flanges 30 and a gasket 40 by performing a 3D scan (step S10). Specifically, the 3D scanner 20 generates three-dimensional shape data of each flange 30, three-dimensional shape data of the gasket 40, and three-dimensional shape data of the fasteners of the pair of flanges 30 (hereinafter also referred to as "flange fasteners") realized by the gasket 40.

[0064] The evaluation device 10 (e.g., processor 101) acquires each three-dimensional shape data from the 3D scanner 20 and stores it in its internal memory (e.g., memory 103) (step S12).

[0065] The processor 101 determines the clearance of the flange fasteners based on the three-dimensional shape data of the flange fasteners (step S14). Specifically, the processor 101 determines the clearance between one flange 30 and the other flange 30 of the flange fasteners.

[0066] The processor 101 measures various data related to the flange 30 based on the three-dimensional shape data of the flange 30 (step S16). Specifically, the processor 101 measures the shape of the annular connection groove formed on the flange surface of the flange 30, the length and depth of the scratches produced in the annular connection groove, the strain of the annular connection groove, etc.

[0067] The processor 101 measures various data related to the gasket 40 based on the three-dimensional shape data of the gasket 40 (step S18). Specifically, the processor 101 measures the shape of the gasket 40, the length and depth of the scratches produced on the gasket 40, the strain of the gasket 40, etc. Furthermore, the processor 101 measures the strain of the embedded area when the gasket 40 is embedded in the ring connecting groove (step S20).

[0068] Based on the measurement results of steps S14 to S20, processor 101 determines whether the ring connection groove needs repair and gasket 40 needs to be replaced (step S22). Based on the determination result, processor 101 displays the suggested information to the user on display 105 (step S24).

[0069] According to the evaluation system 1000, the three-dimensional shape data of flange 30 and gasket 40 are used to determine the shape, scratches, and strain of the ring connection groove and gasket 40. Additionally, the clearance of the flange fasteners and the strain of gasket 40 when embedded in the ring connection groove are also measured. Then, based on the measurement results, it is determined whether repair of the ring connection groove and replacement of gasket 40 are necessary, and corresponding recommendations are presented. Therefore, operators can quickly determine whether repair or replacement is required and can efficiently carry out actions based on the recommendations.

[0070] <Gap Measurement of Flange Fasteners>

[0071] Here, on Figure 3 The specific processing steps of step S14 will be explained.

[0072] Figure 4 This is a diagram showing the flange fasteners. Figure 4 (a) shows the case where an elliptical ring connection gasket 40 is embedded in the ring connection groove 310. Figure 4(b) shows the case where an octagonal ring connection gasket 40 is embedded in the ring connection groove.

[0073] exist Figure 4 (a) shows a pair of flanges 30 (i.e., the upper flange and the lower flange) secured by an elliptical gasket 40. Figure 4 (b) shows a flange fastened together by an octagonal gasket 40. Specifically, an elliptical (or octagonal) gasket 40 is embedded in an annular groove 310 formed in the flange face 300 of each flange 30. The annular groove 310 has a side surface 311 and a bottom surface 312. Typically, the elliptical (or octagonal) gasket 40 contacts the side surface 311 of the annular groove 310.

[0074] like Figure 4 As shown, a gap Cg is formed between one flange 30 (e.g., the upper flange) and another flange 30 (e.g., the lower flange). The evaluation device 10 determines the gap Cg based on the three-dimensional shape data of the flange fasteners. Alternatively, an operator can measure the gap Cg with calipers and input the measured value into the structure of the evaluation device 10. Typically, the evaluation device 10 measures the gap Cg at multiple locations (e.g., more than four locations).

[0075] <Determination of various data related to flanges>

[0076] Here, on Figure 3 The specific processing steps of step S16 will be explained.

[0077] (Determination of shape parameters)

[0078] Figure 5 This is a diagram illustrating the method for determining the shape parameters of the ring connection groove of a flange. (Refer to...) Figure 5 (a) and Figure 5 (b) The evaluation device 10 determines multiple shape parameters P1 related to the shape of the ring connection groove 310 based on the three-dimensional shape data of the flange 30.

[0079] Multiple shape parameters P1 include the angle θr between the centerline of the annular connecting groove 310 and the side surface 311, as well as the width F and depth d of the annular connecting groove 310. The side surface 311 corresponds to the contact surface of the annular connecting groove 310, with which the gasket 40 contacts. The depth d corresponds to the distance between the flange face 300 and the bottom surface 312 of the annular connecting groove 310. Shape parameter P1 may also include the corner radius of the annular connecting groove 310 (not shown).

[0080] (Determination of the length and depth of the scar)

[0081] The evaluation device 10 detects scratches generated within the target area Nf of the ring connection groove 310 based on the three-dimensional shape data of the flange 30. Scratches in the ring connection groove 310 can be detected using known techniques. For example, the evaluation device 10 detects scratches in the ring connection groove 310 by comparing the feature values ​​of the scratches pre-stored in the memory 103 with the feature values ​​of an image created based on the three-dimensional shape data. Typically, the target area Nf is defined as the area in contact with the gasket 40 on each of the inner and outer diameter sides 311 of the ring connection groove 310.

[0082] Reference Figure 5 In (a), when using an elliptical ring-connected gasket, the width W of the object area Nf is set to, for example, "d / 2". The center position of the object area Nf is set to, for example, the center position of the side 311 (the center position of the flange face 300 and the bottom face 312).

[0083] Reference Figure 5 (b) In the case of using an octagonal ring connecting gasket, the width W of the object area Nf is set to the width "w" of the hypotenuse of the ring connecting gasket. "or "w ×(4 / 3)”. The evaluation device 10 can also determine the measured value of the actual contact area width between the ring connecting groove 310 and the gasket 40 based on three-dimensional shape data, and set the measured value as the width W.

[0084] Figure 6 This is a diagram illustrating how the length of the scratch in the ring connection groove is calculated. (Refer to...) Figure 6 (a) and Figure 6 (b) The evaluation device 10 determines (calculates) the length L of the scratch 50 generated in the object region Nf on the side surface 311 based on three-dimensional shape data. For example, perpendicular lines 351 to 353 are drawn from the center line to the side surface 311. Perpendicular line 351 intersects the flange surface 300, perpendicular line 352 intersects one end of the scratch 50 generated on the side surface 311, and perpendicular line 353 intersects the other end of the scratch 50. From this, lengths L1 and L2 are calculated, and therefore the length L of the scratch 50 is calculated based on these lengths L1 and L2, the angle θr contained in the shape parameter P1, and the angle θ (=90°-θr).

[0085] Figure 7 This diagram illustrates how multiple scars can be combined. Figure 7 (a) shows an example of how multiple wounds can be combined. Figure 7 (b) shows another example of how multiple wounds can be combined. Figure 7 (c) shows the length of the wound after merging multiple wounds.

[0086] When multiple wounds are close to each other, the evaluation device 10 merges the multiple wounds into one wound. (Refer to...) Figure 7 In step (a), the evaluation device 10 detects scratches A1 to A3. Next, the evaluation device 10 calculates multiple merging regions B1 to B3 corresponding to each of the scratches A1 to A3. The merging regions are areas defined to determine whether multiple scratches can be merged into one scratch. For example, merging region B1 is a region defined by a distance K from each position of scratch A1. Similarly, merging regions B2 and B3 are regions defined by a distance K from each position of scratches A2 and A3, respectively.

[0087] The evaluation device 10 determines whether a merged region overlaps with other merged regions for multiple merged regions B1 to B3. Figure 7 In example (a), the merged regions B1 to B3 overlap, so the evaluation device 10 merges multiple scars A1 to A3 into one scar.

[0088] Reference Figure 7 In step (b), the evaluation device 10 detects scratches A1 and A2, and calculates multiple merged regions B1 and B2 corresponding to the scratches A1 and A2 respectively. The calculation method for merged region B1 is explained. A baseline representing the maximum length of scratch A1 is drawn, and line segments C1 and C2, located at the two ends of scratch A1 on the baseline, are determined to be at a distance equal to the region width K. Next, in the left-right directions orthogonal to the baseline, the ends of scratch A1 located at the furthest points from the baseline are determined. Line segments C3 and C4, located at a distance equal to the region width K from the determined ends in each direction, are determined. Merged region B1 is the region enclosed by line segments C1 to C4. Merged region B2 is calculated using the same method.

[0089] Evaluation device 10 determines whether merged region B1 overlaps with merged region B2. Figure 7 In example (b), the merged regions B1 and B2 overlap, so the evaluation device 10 merges multiple scars A1 and A2 into one scar.

[0090] Reference Figure 7 (c) Assume that the evaluation device 10 uses the above-described merging method to merge scratches A1 to A3 as a single scratch. In this case, the maximum length of the merged scratch is defined by the distance between the point R1, which is closest to the flange face 300, and the point R2, which is closest to the bottom surface 312 (or furthest from the flange face 300), among the locations of scratches A1 to A3. Therefore, by... Figure 6 The method described uses the length of line segment R1R2 to calculate the length L of the merged scar.

[0091] Figure 8 This is a diagram illustrating how the depth of scratches in a ring connection groove is calculated. (Refer to...) Figure 8 In example (a), a vertical line is drawn from the side 311 (the inclined side of the annular connecting groove 310) to the deepest point of the scratch 50, and the length of this vertical line is measured (calculated) as the depth D of the scratch 50. (Refer to...) Figure 8 In (b), as another example, a perpendicular line is drawn from the center line to the deepest point of the scratch 50. The distance between the intersection of this perpendicular line and the side surface 311 (the hypotenuse of the annular connecting groove 310) and that point is calculated as the depth D of the scratch 50. (Refer to...) Figure 8 In (c), as another example, a virtual surface 361 is defined to surround the periphery of the scar 50. The distance from the virtual surface 361 to the deepest point of the scar 50 is calculated as the depth D.

[0092] (Determination of dependent variable)

[0093] The evaluation device 10 measures the strain of the contact surface (i.e., side surface 311) of the annular groove 310 that contacts the gasket 40 based on the three-dimensional shape data of the flange 30. Specifically, the evaluation device 10 measures the strain of the side surface 311 in the radial and circumferential directions of the flange 30.

[0094] Figure 9 This is a diagram used to illustrate how the radial strain of a ring connection groove is measured. Figure 9 (a) is a top view of flange face 300. Figure 9 (b) and Figure 9 (c) is a cross-sectional view of the ring connecting groove 310.

[0095] Reference Figure 9 (a) Multiple inspection lines are drawn radially from the center O of the flange. Typically, the inspection lines are drawn at equal intervals (e.g., 45-degree intervals) along the circumference of the flange. Strain is measured on the inner diameter side and the outer diameter side 311 where the inspection lines intersect.

[0096] Reference Figure 9 In (b), the average surface of the strained side surface 311 (the inclined side of the annular connecting groove 310) is defined as the reference surface (conical side surface). A perpendicular line is drawn from the reference surface to the side surface 311, and the length of this perpendicular line is measured (calculated) as the radial strain Sr. (Refer to...) Figure 9 (c) As another example, a perpendicular line is drawn from the centerline to the reference plane. The distance between the intersection of this perpendicular line and the side surface 311 (the hypotenuse of the annular connecting groove 310) and the intersection of this perpendicular line and the reference plane is calculated as the radial strain Sr.

[0097] Figure 10 This is a diagram used to illustrate the method for measuring the circumferential strain of a ring connection groove. Figure 10(a) and Figure 10 (b) is a cross-sectional view of the annular connecting groove 310. Figure 10 (c) is a diagram showing the trajectory of the intersection of the side surface 311 of the ring connecting groove 310 and the measuring surface in the circumferential direction.

[0098] Reference Figure 10 (a) Define the angle θm between the central axis of the inner diameter of flange 30 and flange face 300. Based on angle θm, create multiple measuring surfaces X1 and X2 parallel to flange face 300. The intersection of measuring surface X1 and the side surface 311 on the outer diameter side is designated as point Od1, and the intersection of measuring surface X1 and the side surface 311 on the inner diameter side is designated as point Id1. The intersection of measuring surface X2 and the side surface 311 on the outer diameter side is designated as point Od2, and the intersection of measuring surface X2 and the side surface 311 on the inner diameter side is designated as point Id2. As another example, refer to... Figure 10 Alternatively, multiple measuring surfaces X1 and X2 can be created by drawing a vertical line from the central axis to the annular connecting groove 310.

[0099] Reference Figure 10 (c) shows the trajectory of point Od1 along the entire circumference of the annular connecting groove 310. The average of this trajectory is defined as a reference circle, and the distance between the reference circle and the trajectory is measured (calculated) as the circumferential strain Sc. Furthermore, a specified distance (e.g., ±0.15 mm) from the reference circle is considered an allowable zone. Figure 10 In example (c), the trajectory of point Od1 is within the allowable region (i.e., the strain Sc is less than the specified distance), therefore the strain Sr at point Od1 on side 311 is allowable. The strain at points Od2, Id1, and Id2 is calculated in the same way.

[0100] <Measurement of various data related to gaskets>

[0101] Here, on Figure 3 The specific processing steps of step S18 will be explained.

[0102] (Determination of shape parameters)

[0103] Figure 11 This is a diagram illustrating the method for measuring the shape parameters of gaskets. (Refer to...) Figure 11 (a) and Figure 11 (b) The evaluation device 10 determines multiple shape parameters P2 related to the shape of the gasket 40 based on the three-dimensional shape data of the gasket 40.

[0104] Reference Figure 11In (a), when the gasket 40 is an elliptical ring-connecting gasket, multiple shape parameters P2 include the center diameter of the gasket 40 (i.e., the distance between the centerline of the inner diameter of the gasket 40 and the centerline of the cross-section), the height Hov, the width Aov, and the length of the R portion. (Refer to...) Figure 11 In (b), when the gasket 40 is an octagonal ring-connected gasket, multiple shape parameters P2 include the center diameter, height Hoc, width Aoc, planar width of the head Coc, and cone angle θoc of the head of the gasket 40.

[0105] (Determination of the length and depth of the scar)

[0106] The evaluation device 10 detects scratches generated within the target area Ng of the gasket 40 based on the three-dimensional shape data of the gasket 40. The scratches on the gasket 40 can be detected using known techniques. For example, the evaluation device 10 detects scratches on the gasket 40 by comparing the feature values ​​of the scratches pre-stored in the memory 103 with the feature values ​​of an image created based on the three-dimensional shape data. Typically, the target area Ng is defined as the contact surface of the gasket 40 that contacts the inner and outer diameter sides 311 of the annular connecting groove 310.

[0107] Figure 12 This diagram illustrates how the object area of ​​the gasket is defined. (Refer to...) Figure 12 In (a) when using an elliptical ring connecting gasket, a tangent line 401 is drawn to the gasket 40 at an angle θr formed by the tangent line 401 with the center line of the gasket 40's cross-section. Two perpendicular lines are drawn to the gasket 40 with a width of "d / 2" centered on the point of tangency between the tangent line 401 and the gasket 40. The intersection of one perpendicular line and the gasket 40 is designated as point Y1, and the intersection of the other perpendicular line and the gasket 40 is designated as point Y2.

[0108] When the gasket 40 is an elliptical ring connecting gasket, the object area Ng is set as the side area of ​​the gasket 40 from point Y1 to point Y2. Figure 12 The object region Ng shown in (a) includes the contact surface of the gasket 40 that contacts the side surface 311 on the outer diameter side of the annular connecting groove 310.

[0109] Reference Figure 12 (b) In the case of using an octagonal ring connecting gasket, with the center of the hypotenuse as the center, it is specified that "w" Two perpendicular lines are drawn from the gasket 40 with a width of ×(4 / 3). The intersection of one perpendicular line and the gasket 40 is set as point Y3, and the intersection of the other perpendicular line and the gasket 40 is set as point Y4.

[0110] When the gasket 40 is an octagonal ring connecting gasket, the object area Ng is set as the side area of ​​the gasket 40 from point Y3 to point Y4. Figure 12 The object region Ng shown in (b) includes the contact surface of the gasket 40 that contacts the side surface 311 on the outer diameter side of the annular connecting groove 310. Alternatively, it can have the following structure: [The following text appears to be unrelated and possibly a separate document fragment: ...centered on the center of the inclined portion with a "w... The width of the side area is defined as the object area Ng.

[0111] Figure 13 This is a diagram illustrating how the length of a gasket's scratch is calculated. (Refer to...) Figure 13 (a) and Figure 13 (b) The evaluation device 10 determines (calculates) the length Lg of the scratch 60 generated in the object region Ng of the gasket 40 based on three-dimensional shape data. For example, perpendicular lines 451 to 453 are drawn from the center line of the cross section to the contact surface 411 of the gasket 40 (i.e., the surface of the gasket 40 that contacts the annular connecting groove 310). Perpendicular line 451 intersects the end of the contact surface 411, perpendicular line 452 intersects one end of the scratch 60 generated in the object region Ng, and perpendicular line 453 intersects the other end of the scratch 60. From this, lengths L1g and L2g are calculated, and therefore the length Lg of the scratch 60 is calculated based on these lengths L1g and L2g, the angle θr contained in the shape parameter P2, and the angle θ (=90°-θr).

[0112] Furthermore, the way in which multiple scratches are merged in the gasket 40 is the same as the way in which multiple scratches are merged in the aforementioned annular connecting groove.

[0113] Figure 14 This is a diagram illustrating how the depth of a gasket's scratch is calculated. (Refer to...) Figure 14 (a) A perpendicular line is drawn from the contact surface 411 of the gasket 40 to the deepest point of the scratch 60, and the length of this perpendicular line is measured (calculated) as the depth Dg of the scratch 60. (Refer to...) Figure 14 In (b), as another example, a perpendicular line is drawn from the centerline of the cross-section to the deepest point of the scratch 60. The distance between the intersection of this perpendicular line and the contact surface 411 of the gasket 40 and that point is calculated as the depth Dg of the scratch 60. (Refer to...) Figure 14 In (c), as another example, a virtual surface 461 is defined to surround the periphery of the scar 60. The distance from the virtual surface 461 to the deepest point of the scar 60 is calculated as the depth Dg.

[0114] (Determination of dependent variable)

[0115] The evaluation device 10 measures the strain of the contact surface 411 of the gasket 40, which contacts the side surface 311 of the annular connecting groove 310, based on the three-dimensional shape data of the gasket 40. Specifically, the evaluation device 10 measures the strain of the contact surface 411 in the radial and circumferential directions of the gasket 40. The contact surface 411 of an elliptical gasket 40 includes the R-shaped portion of the gasket 40. The contact surface 411 of an octagonal gasket 40 includes the beveled portion of the gasket 40.

[0116] Figure 15 This is a diagram illustrating how the radial strain of a gasket is measured. Figure 15 (a) is a top view of gasket 40. Figure 15 (b) and Figure 15 (c) is a cross-sectional view of gasket 40.

[0117] Reference Figure 15 (a) Multiple inspection lines are drawn radially from the center Og of the inner diameter of the gasket 40. Typically, the inspection lines are drawn at equal intervals (e.g., 45-degree intervals) along the circumference of the gasket 40. The strain is measured at the contact surfaces 411 on the inner and outer diameter sides that intersect the inspection lines.

[0118] Reference Figure 15 In (b), the average surface of the contact surface 411 where strain was generated is defined as the reference surface. A perpendicular line is drawn from the reference surface to the contact surface 411, and the length of this perpendicular line is measured (calculated) as the radial strain Srg. (Refer to...) Figure 15 (c) is another example, from the centerline a perpendicular line is drawn towards the reference plane. The distance between the intersection of this perpendicular line and the contact surface 411 and the intersection of this perpendicular line and the reference plane is calculated as the radial strain Srg.

[0119] Figure 16 This is a diagram used to illustrate how the circumferential strain of a gasket is measured. Figure 16 (a) and Figure 16 (b) is a cross-sectional view of gasket 40. Figure 16 (c) is a diagram showing the trajectory of the intersection of the contact surface 411 of the gasket 40 and the measuring surface in the circumferential direction.

[0120] Reference Figure 16(a) defines the angle θmg between the central axis of the inner diameter of the gasket 40 and the bottom surface 412 (or upper surface) of the gasket 40. Based on the angle θmg, multiple measuring surfaces X1g and X2g parallel to the contact surface 411 of the gasket 40 are made. The intersection of the measuring surface X1g and the contact surface 411 on the outer diameter side is designated as point Oe1, and the intersection of the measuring surface X1g and the contact surface 411 on the inner diameter side is designated as point Ie1. Similarly, the intersection of the measuring surface X2g and the contact surface 411 on the outer diameter side is designated as point Oe2, and the intersection of the measuring surface X2g and the contact surface 411 on the inner diameter side is designated as point Ie2. As another example, refer to... Figure 16 (b) Alternatively, multiple measuring surfaces X1g and X2g can be created by drawing a vertical line from the central axis to the pad 40.

[0121] Reference Figure 16 (c) shows the trajectory of point Oe1 along the entire circumference of gasket 40. The average of this trajectory is defined as a reference circle, and the distance between the reference circle and the trajectory is measured (calculated) as the circumferential strain Scg. Furthermore, a specified distance (e.g., ±0.15 mm) from the reference circle is considered an allowable zone. Figure 16 In example (c), the trajectory of point Oe1 is within the allowable region (i.e., the strain Scg is less than the specified distance), therefore the strain Srg of point Oe1 on contact surface 411 is allowed. The strains for points Oe2, Ie1, and Ie2 are calculated in the same way.

[0122] <Determination of Strain During Gasket Embedding>

[0123] Here, on Figure 3 The specific processing steps of step S20 will be explained.

[0124] The strain on the side 311 of the ring connecting groove 310 can be passed through Figure 9 , Figure 10 The method described herein shall be used for measurement. Furthermore, the strain of the contact surface 411 of the gasket 40 can be measured by… Figure 15 , Figure 16 The method described herein is used for measurement. However, in practice, the gaskets 40 are used with the gaskets 40 embedded in the ring connection groove 310, so it is preferable to measure the degree of strain generated in this state. Here, the method for measuring the strain at the fastening portion where the gaskets 40 are embedded in the ring connection groove 310 will be described.

[0125] Figure 17 This is a diagram used to illustrate the method of measuring strain at fastened parts. Figure 17 (a) is a diagram illustrating the strain of the contact surface of the gasket and the side of the annular groove. Figure 17 (b) is a graph used to illustrate the strain of the fastening part.

[0126] Reference Figure 17 In (a), the strain of the contact surface 411 of the gasket 40 and the strain of the side surface 311 of the annular connecting groove are both less than the reference strain Thx. Therefore, the evaluation device 10 determines that the strain of the contact surface 411 and the side surface 311 is the permissible strain.

[0127] Reference Figure 17 (b) The evaluation device 10 calculates the strain of the fastening portion of the gasket 40 embedded in the annular connecting groove 310 based on the strain of the contact surface 411 and the side surface 311, respectively. Specifically, the sum of the strain at each position of the contact surface 411 and the strain at each position of the side surface 311 facing each position of the contact surface 411 when the gasket 40 is embedded in the annular connecting groove 310 is used as the strain of the fastening portion.

[0128] For example, refer to Figure 17 In region 501 (a), the contact surface 411 experiences strain in the upward direction (+Th direction), and the side surface 311 also experiences strain in the upward direction. Therefore, the strain of the fastened portion remains constant and is less than the reference strain Thx.

[0129] On the other hand, in region 502, the contact surface 411 experiences strain in the upward direction, but the side surface 311 experiences strain in the downward direction (-Th direction). Therefore, the strain of the fastened part becomes larger, exceeding the reference strain Thx.

[0130] The evaluation device 10 extracts the maximum value of the strain of the fastened part and compares the maximum value with the reference strain Thx to determine whether the strain of the fastened part is permissible.

[0131] Figure 18 This is another example of a method for measuring the strain of a fastener. Figure 18 (a) is a diagram illustrating the strain of the contact surface of the gasket and the side of the annular groove. Figure 18 (b) is a graph used to illustrate the strain of the fastening part.

[0132] exist Figure 18 In example (a), there are scratches and deposits on the side 311 of the ring connection groove 310. Alternatively, the following structure could be used: these scratches and deposits on the side 311 (or contact surface 411) could be considered when calculating the strain. See [reference]. Figure 18 As can be seen from (b), in the area where there are scratches and attachments on the side 311, the strain of the fastened part is above the baseline strain Thx.

[0133] Determining whether repair or replacement is necessary.

[0134] Here, on Figure 3 The specific processing steps of step S22 will be explained.

[0135] Based on the evaluation results described above, the evaluation device 10 determines whether repair of the ring connection groove 310 and replacement of the gasket 40 are necessary. Specifically, the following conditions are used to determine whether repair and replacement are required.

[0136] (Condition Z1: Clearance of the flange fasteners)

[0137] Condition Z1 is based on the clearance Cg of the flange fasteners. Specifically, the evaluation device 10 determines whether the following condition Z1 is met: at least one of the clearances Cg measured at multiple locations is a reference value Cx (e.g., 1.5 mm) or higher. If condition Z1 is met, the evaluation device 10 determines that at least one of the annular connection groove 310 of one flange 30, the annular connection groove 310 of the other flange 30, and the gasket 40 is abnormal.

[0138] Evaluation device 10 evaluates the severity of flange 30 and gasket 40. The severity is evaluated on an 11-level scale from 0 to 10. A higher severity value indicates a more severe condition of flange 30 and gasket 40 (i.e., a worse condition of flange 30 and gasket 40). Under condition Z1, evaluation device 10 evaluates the severity as "2".

[0139] (Condition Z2: Shape of the ring connecting groove)

[0140] Condition Z2 is based on the shape parameter P1 of the annular connection groove 310 of flange 30. Evaluation device 10 determines whether the corresponding benchmark is met for each shape parameter P1.

[0141] Specifically, the evaluation device 10 determines whether the following condition Z2a is met: the angle θr is outside the reference angle range θx (e.g., 23 ± 0.5 degrees). The evaluation device 10 determines whether the following condition Z2b is met: the width F of the annular connecting groove 310 is outside the reference range Fx (e.g., specified width ± 0.2 mm). The evaluation device 10 determines whether the following condition Z2c is met: the depth d of the annular connecting groove 310 is outside the reference range dx (e.g., the range from "specified depth" to "specified depth + 0.4 mm").

[0142] Then, if at least one of conditions Z2a to Z2c is met (i.e., condition Z2 is satisfied), the evaluation device 10 determines that the ring connection groove 310 is in a state requiring repair. If condition Z2 is satisfied, the evaluation device 10 evaluates the severity of the ring connection groove 310 as "10".

[0143] (Condition Z3: Scratches and strain in the ring connection groove)

[0144] Condition Z3 is based on the maximum length Lmax of the scratch generated in the object region Nf of the ring connection groove 310 and the strain of the side surface 311. The maximum length Lmax is the maximum value among the lengths L of the multiple scratches detected.

[0145] The evaluation device 10 determines whether the following condition Z3a is met: the maximum length Lmax of the scratch is greater than or equal to the reference value Lx1. For example, the reference value Lx1 is set to "W×(1 / 2)" using the width W of the object region Nf. As described above, "W=d / 2" is used when using an elliptical ring connecting gasket, and "W=w" is used when using an octagonal ring connecting gasket. ×(4 / 3)” or “W=w” When the maximum length Lmax is greater than or equal to the baseline value Lx1 (i.e., condition Z3a is met), the evaluation device 10 determines that the ring connection groove 310 is in a state that needs repair.

[0146] Furthermore, the evaluation device 10 determines whether the strain of the side surface 311 is greater than or equal to the reference strain Th1 (e.g., 0.15 mm). Specifically, the evaluation device 10 determines whether the following condition Z3b is met: both the maximum radial strain J1 and the maximum circumferential strain J2 of the side surface 311 are greater than or equal to the reference strain Th1. If both the maximum strain J1 and the maximum strain J2 are greater than or equal to the reference strain Th1 (i.e., condition Z3b is met), the evaluation device 10 determines that the annular connecting groove 310 is in a state requiring repair.

[0147] In summary, if at least one of conditions Z3a and Z3b is met (i.e., condition Z3 is met), the evaluation device 10 determines that the ring connection groove 310 is in a state requiring repair. If condition Z3 is met, the evaluation device 10 evaluates the severity of the ring connection groove 310 as "8".

[0148] (Condition Z4: Scratches on the ring connection groove)

[0149] Condition Z4 is based on the length L and depth D of the scratch in the ring connection groove.

[0150] The evaluation device 10 determines whether the following condition Z4a is met: there is a scratch with a length L that is less than the reference value Lx1 and greater than the reference value Lx2, and a depth D that is greater than the reference value Dx1 (e.g., 0.25 mm). For example, the reference value Lx2 is set to "W×(1 / 4)". Additionally, the evaluation device 10 determines whether the following condition Z4b is met: there is a scratch with a length L that is less than the reference value Lx2, and a depth D that is greater than the reference value Dx2 (e.g., 0.75 mm).

[0151] If at least one of conditions Z4a and Z4b is met (i.e., condition Z4 is met), the evaluation device 10 determines that the ring connection groove 310 is in a state requiring repair. If condition Z4 is met, the evaluation device 10 evaluates the severity of the ring connection groove 310 as "6".

[0152] (Condition Z5: Shape of the gasket)

[0153] Condition Z5 is based on the shape parameter P2 of the gasket 40. The evaluation device 10 determines whether the corresponding benchmark is met for each shape parameter P2.

[0154] Specifically, the evaluation device 10 determines whether the following condition Z5a is met: the center diameter of the gasket 40 is outside the reference range Cdx (e.g., a specified value ± 0.18 mm). The evaluation device 10 determines whether the following condition Z5b is met: the height H (e.g., Hov, Hoc) of the gasket 40 is outside the reference range Hx (e.g., a range from "specified value - 0.5 mm" to "specified value + 1.3 mm"). The evaluation device 10 determines whether the following condition Z5c is met: the width A (e.g., Aov, Aoc) of the gasket 40 is outside the reference range Ax (e.g., a specified value ± 0.2 mm).

[0155] When an elliptical gasket 40 is used, the evaluation device 10 determines whether the following condition Z5d is met: the length of the R portion of the gasket 40 is outside the reference range (e.g., a range of ±0.2 mm).

[0156] When an octagonal gasket 40 is used, the evaluation device 10 determines whether the following condition Z5e is met: the planar width Coc of the gasket 40 is outside the reference range (e.g., a specified value ±0.2 mm). Furthermore, the evaluation device 10 determines whether the following condition Z5f is met: the cone angle θoc of the head of the gasket 40 is outside the reference range (e.g., 23 ± 0.5 degrees).

[0157] For the elliptical gasket 40, if at least one of conditions Z5a to Z5d is met (i.e., condition Z5 is satisfied), the evaluation device 10 determines that the gasket 40 needs to be replaced. Similarly, for the octagonal gasket 40, if at least one of conditions Z5a to Z5c, Z5e, and Z5f is met (i.e., condition Z5 is satisfied), the evaluation device 10 determines that the gasket 40 needs to be replaced. When condition Z5 is met, the evaluation device 10 rates the severity of the gasket 40 as "10".

[0158] (Condition Z6: Scratches and strain on the gasket)

[0159] Condition Z6 is based on the maximum length Lgmax of the scratch generated in the object area Ng of the gasket 40 and the strain of the contact surface 411. The maximum length Lgmax is the maximum value among the lengths Lg of the multiple scratches detected.

[0160] The evaluation device 10 determines whether the following condition Z6a is met: the maximum length Lgmax of the scratch is greater than or equal to the reference value Lgx1. For example, the reference value Lgx1 is set to "Wg×(1 / 2)" using the width Wg of the object region Ng. In the case of using an elliptical ring connecting gasket, the width Wg is... Figure 12 The width of the object region Ng in (a). When using an octagonal ring connecting gasket, the width Wg is... Figure 12 (b) The width of the object region Ng. When the maximum length Lgmax is greater than or equal to the baseline value Lgx1 (i.e., condition Z6a is met), the evaluation device 10 determines that the gasket 40 is in a state that needs to be replaced.

[0161] The evaluation device 10 determines whether the strain of the contact surface 411 is greater than or equal to the reference strain Th2 (e.g., 0.15 mm). Specifically, the evaluation device 10 determines whether the following condition Z6b is met: both the maximum radial strain Jg1 and the maximum circumferential strain Jg2 of the contact surface 411 are greater than or equal to the reference strain Th2. If both the maximum strain J1 and the maximum strain J2 are greater than or equal to the reference strain Th2 (i.e., condition Z6b is met), the evaluation device 10 determines that the gasket 40 is in a state where it needs to be replaced.

[0162] In summary, if at least one of conditions Z6a and Z6b is met (i.e., condition Z6 is met), the evaluation device 10 determines that the gasket 40 is in a state requiring replacement. If condition Z6 is met, the evaluation device 10 evaluates the severity of the gasket 40 as "8".

[0163] (Condition Z7: Scratches on the gasket)

[0164] Condition Z7 is based on the length Lg and depth Dg of the gasket's scratch.

[0165] The evaluation device 10 determines whether the following condition Z7a is met: there is a scratch with a length Lg that is less than the reference value Lgx1 and greater than the reference value Lgx2, and a depth Dg that is greater than the reference value Dx1 (e.g., 0.25 mm). For example, the reference value Lgx2 is set to "Wg×(1 / 4)". In addition, the evaluation device 10 determines whether the following condition Z7b is met: there is a scratch with a length Lg that is less than the reference value Lgx2, and a depth Dg that is greater than the reference value Dx2 (e.g., 0.75 mm).

[0166] If at least one of conditions Z7a and Z7b is met (i.e., condition Z7 is met), the evaluation device 10 determines that the gasket 40 is in a state that needs to be replaced. If condition Z7 is met, the evaluation device 10 evaluates the severity of the gasket 40 as "6".

[0167] (Condition Z8: Strain of the fastening parts)

[0168] Condition Z8 is based on the strain of the gasket 40 being embedded in the fastening portion of the ring connection groove 310.

[0169] The evaluation device 10 determines whether the following condition Z8 is met: the maximum strain of the fastening part is greater than or equal to the reference strain Thx (e.g., 0.05 mm). If the maximum strain of the fastening part is greater than or equal to the reference strain Thx (i.e., condition Z8 is met), the evaluation device 10 determines that the ring connection groove 310 is in a state requiring repair or the gasket 40 is in a state requiring replacement. If condition Z8 is met, the evaluation device 10 evaluates the severity of the fastening part as "4".

[0170] (Condition Z9: Strain and scratches on the fastened parts)

[0171] Condition Z9 is based on the strain of the fastened part and the depth of the scratch (e.g., depth D, Dg).

[0172] The evaluation device 10 determines whether the following condition Z9 is met: the sum of the maximum value of the strain of the fastening part and the depth of the scratch is greater than or equal to the reference value Thx (e.g., 0.05 mm). If the sum is greater than or equal to the reference value Thx (i.e., condition Z9 is met), the evaluation device 10 determines that the ring connection groove 310 is in a state that needs repair or the gasket 40 is in a state that needs to be replaced. If condition Z9 is met, the evaluation device 10 evaluates the severity of the fastening part as "4".

[0173] (Summarize)

[0174] If condition Z1 is met, the evaluation device 10 determines that at least one of the flange 30 and gasket 40 is abnormal. If any of conditions Z2 to Z4 are met, the evaluation device 10 determines that the ring connection groove 310 needs repair. If any of conditions Z5 to Z7 are met, the evaluation device 10 determines that the gasket 40 needs replacement. If any of conditions Z8 or Z9 are met, the evaluation device 10 determines that either the ring connection groove 310 of the flange 30 needs repair or the gasket 40 needs replacement. Furthermore, if any of conditions Z1 to Z9 are met, the evaluation device 10 evaluates the severity based on the met conditions.

[0175] On the other hand, if none of the conditions Z1 to Z9 are met, the ring connection groove 310 and the gasket 40 are considered to be in good condition. Therefore, in this case, the evaluation device 10 determines that it is not necessary to repair the ring connection groove 310 or replace the gasket 40.

[0176] <Display of suggestion information>

[0177] Here, on Figure 3 The specific processing steps of step S24 will be explained.

[0178] (Condition Z1 is satisfied)

[0179] Gaskets, ring grooves, etc., may have been deformed. Therefore, the evaluation device 10 displays on the display 105 a recommendation message indicating the meaning and severity "2" of the abnormality confirmation required when the flange is open. Additionally, the recommendation message includes information suggesting repair of the ring groove and gasket replacement based on the results of the abnormality confirmation. The information recommending ring groove repair includes, for example, recommending cutting or grinding to a value greater than the sum of the maximum value of the scratch and strain plus a specified value (e.g., 0.05 mm).

[0180] (Conditions Z2 and Z3 are satisfied)

[0181] The ring connection groove has deformed and needs repair. The evaluation device 10 displays recommendation information on the display 105 indicating that the ring connection groove needs repair. The recommendation information includes information recommending lapping of the ring connection groove and the gasket, and confirmation of the mating surface using red lead. If condition Z2 is met, the recommendation information also includes information indicating a severity level of "10". If condition Z3 is met, the recommendation information also includes information indicating a severity level of "8".

[0182] (Condition Z4 is satisfied)

[0183] The ring connection groove is faulty and requires repair. The evaluation device 10 displays a recommendation message on the display 105 indicating that the ring connection groove needs repair and its severity ("4"). The recommendation message includes information suggesting that the ring connection groove and the gasket be lapped together and that the mating surfaces be checked using red lead.

[0184] (Conditions Z5 and Z6 are met)

[0185] The gasket has deformed and needs to be replaced. The evaluation device 10 displays a recommendation message on the display 105 indicating that the gasket needs to be replaced. The recommendation message includes information recommending lapping the ring connection groove and the gasket together and confirming the contact surface using red lead. If condition Z5 is met, the recommendation message also includes information indicating a severity level of "10". If condition Z6 is met, the recommendation message also includes information indicating a severity level of "8".

[0186] (Condition Z7 is met)

[0187] The gasket is faulty and needs to be replaced. The evaluation device 10 displays a recommendation message on the display 105 indicating that the gasket needs to be replaced and the severity level "6". The recommendation message includes information recommending that the annular groove and the gasket be aligned and that the mating surfaces be checked using red lead.

[0188] (Conditions Z8 and Z9 are met)

[0189] Leakage may occur due to deformation of the gasket or ring connection groove. The evaluation device 10 will display on the display 105 information including recommendations for repairing the ring connection groove and replacing the gasket, as well as a severity level "4".

[0190] <Functional Structure>

[0191] Figure 19 This is a block diagram illustrating an example of the functional structure of an evaluation device. (Refer to...) Figure 19 The evaluation device 10 includes a data acquisition unit 601, an evaluation unit 603, and an output control unit 605 as its main functional structure. These functions are implemented, for example, by the processor 101 of the evaluation device 10 executing a program stored in the memory 103. In addition, some or all of these functions may also be implemented in hardware.

[0192] The data acquisition unit 601 acquires the three-dimensional shape data of both the flange 30 and the gasket 40. Additionally, the data acquisition unit 601 acquires the three-dimensional shape data of the flange fastener after one flange 30 is fastened to the other flange 30 via the ring-connected gasket 40. Specifically, the data acquisition unit 601 acquires the respective three-dimensional shape data from the 3D scanner 20 via the input / output interface 109 (or communication interface 111).

[0193] The evaluation unit 603 evaluates the condition of the ring connection groove 310, gasket 40, and flange fasteners based on the three-dimensional shape data. Specifically, the evaluation unit 603 includes a shape measuring unit 611, a gap measuring unit 612, a setting unit 613, a detection unit 615, a strain measuring unit 617, and a judgment unit 619.

[0194] The shape measuring unit 611 measures multiple shape parameters P1 (e.g., angle θr, width F, depth d) related to the shape of the annular connecting groove 310 based on the three-dimensional shape data of the flange 30. The shape measuring unit 611 measures multiple shape parameters P2 (e.g., center diameter, height, width of the gasket) related to the shape of the gasket 40 based on the three-dimensional shape data of the gasket 40.

[0195] The gap measuring unit 612 measures the gap between one flange 30 and the other flange 30 in the flange fastener based on the three-dimensional shape data of the flange fastener.

[0196] The setting unit 613 sets the target area Nf of the annular connection groove 310 based on the three-dimensional shape data of the flange 30. Specifically, the setting unit 613 follows... Figure 5 The object region Nf is defined in the manner described herein. The object region Nf is a defined area (e.g., an area defined by width W) in the contact surface (i.e., side surface 311) of the annular connecting groove 310. Alternatively, the object region Nf may be the entire area of ​​the side surface 311.

[0197] Furthermore, the setting unit 613 sets the target area Ng of the gasket 40 based on the three-dimensional shape data of the gasket 40. Specifically, the setting unit 613 follows... Figure 12 The object region Ng is set in the manner described in the text. The object region Ng is set on the contact surface 411 of the gasket 40 that contacts the side 311 of the ring connecting groove 310.

[0198] The detection unit 615 detects defects generated in the object region Nf based on the three-dimensional shape data of the flange 30. In one aspect, the detection unit 615 detects the first defects that are close to each other in the object region Nf (e.g., according to the above-described method of merging multiple defects). Figure 7 The first wound (A1) and the second wound (e.g., Figure 7 In the case of scratch A2), the first scratch and the second scratch are merged into one scratch. The detection unit 615 outputs the detection results of the scratches in the object region Nf to the judgment unit 619. The detection results include the length L and depth D of the detected scratch.

[0199] Furthermore, the detection unit 615 detects scratches on the contact surface 411 (e.g., the target area Ng) of the gasket 40 that contacts the ring connecting groove 310, based on the three-dimensional shape data of the gasket 40. The detection unit 615 outputs the detection results of the scratches in the target area Ng to the judgment unit 619. The detection results include the length Lg and depth Dg of the detected scratches.

[0200] The strain measuring unit 617 measures the strain of the contact surface (i.e., side surface 311) of the annular connection groove 310 based on the three-dimensional shape data of the flange 30. Specifically, the strain measuring unit 617 measures the strain according to... Figure 9 The radial strain on the side 311 is measured using the method described in the text. Figure 10 The measurement method described herein is used to measure the circumferential strain of the side surface 311.

[0201] On the other hand, the strain measuring unit 617 measures the strain of the contact surface 411 of the gasket 40 based on the three-dimensional shape data of the gasket 40. Specifically, the strain measuring unit 617 measures the strain according to... Figure 15 The radial strain of the contact surface 411 is measured using the method described in the instructions. Figure 16 The circumferential strain of the contact surface 411 is measured using the measurement method described herein.

[0202] In another aspect, the strain measuring unit 617 calculates the strain at the area (e.g., the fastening portion) where the gasket 40 is embedded in the annular connection groove 310 based on the strain of the side surface 311 and the strain of the contact surface 411. Specifically, the strain measuring unit 617 calculates the strain according to... Figure 17 and Figure 18 The determination method described herein is used to calculate the dependent variable.

[0203] The judgment unit 619 determines whether the ring connection groove 310 needs to be repaired based on at least one of multiple shape parameters P1, the damage to the ring connection groove 310, and the strain.

[0204] Specifically, when at least one of the multiple shape parameters P1 is outside the reference range (e.g., when condition Z2 is met), when the length L of the scratch in the object region Nf is greater than or equal to a first length (e.g., reference value Lx1) (e.g., when condition Z3a is met), or when the strain of the side surface 311 is greater than or equal to a first threshold (e.g., reference strain Th1) (e.g., when condition Z3b is met), the determination unit 619 determines that the ring connecting groove 310 is in a state that needs repair.

[0205] Furthermore, if the length L of the scratch is less than the first length and the depth D of the scratch is greater than or equal to the first depth (e.g., the reference value Dx1) (e.g., the condition Z4a is met), the determination unit 619 determines that the ring connection groove 310 is in a state that needs to be repaired.

[0206] On the other hand, the judgment unit 619 determines whether the gasket 40 needs to be replaced based on at least one of multiple shape parameters P2, scratches on the contact surface 411, and strain.

[0207] Specifically, if at least one of the multiple shape parameters P2 is outside the reference range (e.g., if condition Z5 is met), if the length Lg of the scratch on the contact surface 411 is greater than or equal to the second length (e.g., reference value Lgx1) (e.g., if condition Z6a is met), or if the strain is greater than or equal to the second threshold (e.g., reference strain Th2) (e.g., if condition Z6b is met), the determination unit 619 determines that the gasket 40 needs to be replaced.

[0208] In addition, if the length Lg of the scratch on the contact surface 411 is less than the second length and the depth Dg of the scratch is greater than or equal to the second depth (e.g., the reference value Dx1) (e.g., the condition Z7a is met), the determination unit 619 determines that the gasket 40 needs to be replaced.

[0209] In another aspect, if the strain at the area where the gasket 40 is embedded in the ring connection groove 310 is above the third threshold (e.g., the reference strain Thx) (e.g., if condition Z8 or condition Z9 is met), the determination unit 619 determines that at least one of repairing the ring connection groove 310 and replacing the gasket 40 is required.

[0210] In another aspect, when the gap Cg of the flange fastener is above the reference value Cx (for example, when condition Z1 is met), the determination unit 619 determines that at least one of the annular connection groove 310 of one flange 30, the annular connection groove 310 of the other flange 30, and the gasket 40 has become abnormal.

[0211] The output control unit 605 outputs suggestion information to the user based on the judgment result of the judgment unit 619. Specifically, based on the judgment result that the ring connection groove 310 is in a state that needs repair, the output control unit 605 outputs information recommending that the ring connection groove 310 be cut or ground as suggestion information. In addition, based on the judgment result that the shim 40 is in a state that needs to be replaced, the output control unit 605 outputs information recommending that the shim 40 be replaced as suggestion information. Typically, the output control unit 605 displays the content described in the above-described "Display of Suggestion Information" section on the display 105.

[0212] <Advantages>

[0213] According to this embodiment, without relying on the operator's technical knowledge and experience, the need for repair of the flange ring groove and replacement of the gasket is appropriately determined based on the condition of the flange ring groove, gasket, and flange fasteners. Furthermore, the decision to repair or replace is not subjective. Additionally, the suggested information allows the operator to efficiently handle the flange and gasket.

[0214] <Other Implementation Methods>

[0215] (1) In the above embodiments, a program can also be provided to enable a computer to perform the controls as described in the flowchart above. Such a program can also be recorded using a non-transitory, computer-readable recording medium such as a floppy disk, secondary storage device, main storage device, or memory card attached to the computer, and provided as a program product. Alternatively, it can be recorded using a recording medium such as a hard disk built into the computer to provide the program. Furthermore, the program can also be provided via download from a network.

[0216] (2) The structure illustrated in the above embodiment is an example of the structure of the present invention, and it can also be combined with other known technologies, and can be modified by omitting a part or other changes without departing from the spirit of the present invention. In addition, it is also possible to implement the above embodiment by appropriately adopting the processing and structure described in other embodiments.

[0217] The embodiments disclosed herein should be considered illustrative rather than restrictive in all respects. The scope of the invention is set forth in the claims rather than in the foregoing description, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0218] Explanation of reference numerals in the attached figures

[0219] 10: Evaluation device; 20: Scanner; 30: Flange; 40: Ring connection gasket; 50, 60: Scratches; 101: Processor; 103: Memory; 105: Display; 107: Input device; 109: Input / output interface; 111: Communication interface; 300: Flange face; 310: Ring connection groove; 601: Data acquisition unit; 603: Evaluation unit; 605: Output control unit; 611: Shape measurement unit; 612: Gap measurement unit; 613: Setting unit; 615: Detection unit; 617: Strain measurement unit; 619: Judgment unit; 1000: Evaluation system.

Claims

1. An evaluation device comprising: The acquisition unit acquires the first three-dimensional shape data of the ring-connected flange; and The evaluation department evaluates the state of the annular connection groove formed on the flange surface of the flange based on the first three-dimensional shape data. in, The evaluation department includes: A shape measuring unit that measures a plurality of first shape parameters related to the shape of the ring connecting groove; The inspection unit detects scratches generated in the object area of ​​the ring connection groove; The strain measuring unit measures the first strain of the first contact surface of the ring connecting groove, wherein the ring connecting gasket is in contact with the first contact surface; and The determination unit determines whether the annular connection groove needs to be repaired based on at least one of the plurality of first shape parameters, the scratch, and the first strain.

2. The evaluation device according to claim 1, wherein, If at least one of the plurality of first shape parameters is outside the reference range, if the length of the scratch is greater than or equal to a first length, if the first strain is greater than or equal to a first threshold, or if the length of the scratch is less than the first length and the depth of the scratch is greater than or equal to a first depth, the determination unit determines that the ring connecting groove is in a state that needs repair.

3. The evaluation device according to claim 2, wherein, The plurality of first shape parameters include the angle between the centerline representing the center of the annular connecting groove and the first contact surface, as well as the width and depth of the annular connecting groove.

4. The evaluation device according to claim 2 or 3, wherein, It also includes an output control unit, which outputs suggestion information to the user based on the judgment result of the judgment unit. Based on the determination that the ring connecting groove is in a state that needs repair, the output control unit outputs information recommending that the ring connecting groove be cut or ground as the suggestion information.

5. The evaluation device according to any one of claims 1 to 3, wherein, When the detection unit detects a first scratch and a second scratch that are close to each other in the object area, it merges the first scratch and the second scratch into a single scratch.

6. The evaluation apparatus according to any one of claims 1 to 3, wherein, The strain measuring unit measures the first strain in the radial and circumferential directions of the flange.

7. The evaluation apparatus according to any one of claims 1 to 3, wherein, The target area is a specified area in the first contact surface of the ring connecting groove or the entire area of ​​the first contact surface.

8. The evaluation apparatus according to any one of claims 1 to 3, wherein, The acquisition unit also acquires the second three-dimensional shape data of the ring connecting gasket. The evaluation unit also evaluates the condition of the ring connection gasket based on the second three-dimensional shape data. The shape measuring unit also measures a number of second shape parameters related to the shape of the ring connecting gasket. The detection unit also detects scratches on the second contact surface of the ring connecting gasket, wherein the ring connecting groove contacts the second contact surface. The strain measuring unit also measures the second strain of the second contact surface. The determination unit further determines whether the ring connection gasket needs to be replaced based on at least one of the plurality of second shape parameters, the scratches on the second contact surface, and the second strain.

9. The evaluation apparatus according to claim 8, wherein, If at least one of the plurality of second shape parameters is outside the reference range, if the length of the scratch on the second contact surface is greater than or equal to the second length, if the second strain is greater than or equal to the second threshold, or if the length of the scratch on the second contact surface is less than the second length and the depth of the scratch on the second contact surface is greater than or equal to the second depth, the determination unit determines that the ring connecting gasket needs to be replaced.

10. The evaluation apparatus according to claim 9, wherein, The plurality of second shape parameters include the center diameter, height, and width of the ring connecting gasket.

11. The evaluation apparatus according to claim 9, wherein, The strain measurement unit calculates a third strain in the region where the ring connecting gasket is embedded in the ring connecting groove, based on the first strain and the second strain. If the third strain is above the third threshold, the determination unit determines that at least one of the following needs to be performed: repair of the ring connection groove or replacement of the ring connection gasket.

12. The evaluation apparatus according to any one of claims 1 to 3, wherein, The acquisition unit also acquires the third-dimensional shape data of the flange fastener after the flange and other flanges are fastened together via the ring connecting gasket. The evaluation unit further includes a gap measuring unit, which measures the gap between the flange and other flanges in the flange fastener based on the third three-dimensional shape data. If the gap is above a specified value, the determination unit determines that at least one of the ring connection groove of the flange, the ring connection groove of the other flange, and the ring connection gasket is abnormal.

13. An evaluation method, comprising the following steps: The processor acquires the first three-dimensional shape data of the ring-connected flange; as well as The processor evaluates the state of the annular connection groove formed on the flange surface of the flange based on the first three-dimensional shape data. The evaluation steps include: Determine a number of first shape parameters related to the shape of the ring connecting groove; Detect scratches generated in the object area of ​​the ring connection groove; The first strain of the first contact surface of the ring connecting groove is measured, wherein the ring connecting gasket is in contact with the first contact surface; and Based on at least one of the plurality of first shape parameters, the scratch, and the first strain, it is determined whether the ring connection groove needs to be repaired.

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