Diagnostic device for rotating machinery

Abstract

To provide a diagnostic device for a rotating machinery, which has a relatively simple structure by reducing information necessary for diagnosis.SOLUTION: A diagnosis device 10 for a rotating machinery includes a sensor 5; a reference time input unit 30 which inputs a time point at which maintenance was performed on each rotating unit 3, as a reference time of diagnosis; a data accumulation unit 32 which acquires and accumulates vibration data of each rotating unit 3 at the time of passage of a prescribed time from the reference time; a reference value generation unit 34 which generates a reference value for each rotating unit 3; a reference value storage unit 36; a diagnosis-time data acquisition unit 40 which acquires vibration data of each rotating unit 3 at a prescribed diagnosis time; and a diagnosis unit 50 which compares the data at the diagnosis time with the reference value in each rotating unit 3 and diagnoses the rotating unit as abnormal or needing care when the data at the diagnosis time exceeds an upper limit of the reference value or is less than a lower limit of the reference value.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a diagnostic device for a rotating device that diagnoses the state of the rotating device. [Background technology]

[0002] Various devices have been developed to diagnose the condition of rotating equipment. For example, there are devices that diagnose whether or not there is an abnormality in the equipment based on vibration data obtained by fast Fourier transform (FFT analysis) of the vibration data of rotating equipment. In addition, vibration data of rotating equipment can also be processed using a method that uses absolute judgment values ​​specified in the ISO standard (100816-3:2009).

[0003] For example, Patent Document 1 listed below describes an abnormality diagnosis device for a vibrating machine, which includes a memory unit that stores reference data obtained by Fourier transforming vibration data of the vibrating machine, an acquisition unit that acquires vibration data of the vibrating machine over time, a conversion unit that performs Fourier transform on the vibration data acquired by the acquisition unit to generate diagnostic data, and a diagnosis unit that compares the spectral values ​​of the reference data with the spectral values ​​of the diagnostic data over time and diagnoses an abnormality when the diagnostic data differs from the reference data by a predetermined amount or more. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7075466 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, when diagnosing abnormalities based on vibration data obtained through FFT analysis of the rotating parts of multiple rotating equipment, it is necessary to input a large number of parameters, such as the performance of the rotating parts of each rotating equipment (for example, model numbers and product numbers of motors and bearings, rotation speed, inner and outer diameter dimensions, etc.), diagnostic conditions, and other conditions. However, inputting these parameters was time-consuming.

[0006] Furthermore, the model number of a rotating device may be written on the surface of the product, attached to a sticker, or engraved in a designated location on the product, but if a long time has passed since the product was first manufactured, it may not be possible to see these, and it may not be possible to input the necessary parameters in the first place.

[0007] Furthermore, although the method of diagnosing abnormalities using absolute judgment values ​​provides a rough guide for diagnosing abnormalities, the accuracy may be insufficient.

[0008] Furthermore, in the method of diagnosing abnormalities using the above-mentioned FFT analysis or absolute judgment value, the diagnosis results change even for the same rotating equipment depending on aging, the usage environment, the usage conditions, etc., and it has sometimes been difficult to obtain appropriate diagnosis results for the rotating parts of individual rotating equipment at a specified time of diagnosis.

[0009] Furthermore, as mentioned above, although the diagnostic results obtained by the abnormality diagnostic means using FFT analysis are detailed and accurate, such detailed and accurate diagnostic results are not always required at the site where rotating machinery is installed in a plant, etc. Also, while diagnostic devices that employ the abnormality diagnostic method using FFT analysis can obtain detailed and accurate diagnostic results, the system becomes complicated and expensive, and it is difficult to say that they can be used easily.

[0010] Therefore, an object of the present invention is to provide a diagnostic device for rotating equipment that can obtain necessary and sufficient diagnostic results for individual rotating equipment to serve as a guide for maintenance even with a small amount of information, and that is inexpensive and easy to use. [Means for solving the problem]

[0011] In order to achieve the above object, the rotating equipment diagnostic device of the present invention is characterized in that it comprises sensors that are installed in each of the rotating parts of a plurality of rotating equipment to be maintained and that detect at least vibration data from each rotating part; a reference time input unit that inputs the time when maintenance was performed on each rotating part as a reference time for diagnosing the rotating equipment; a data accumulation unit that acquires and accumulates the vibration data of each rotating part detected by each sensor when a predetermined time has elapsed from the reference time inputted to the reference time input unit; a reference value creation unit that creates a reference value having a predetermined range for each rotating part based on the vibration data accumulated in the data accumulation unit; a reference value memory unit that stores the reference values; a diagnostic data acquisition unit that acquires the vibration data of each rotating part detected by the sensor as diagnostic data at a predetermined diagnostic time; and a diagnostic unit that compares the diagnostic data acquired by the diagnostic data acquisition unit with the reference values ​​for the corresponding rotating part read from the reference value memory unit, and diagnoses an abnormality or a warning when the diagnostic data exceeds an upper limit of the reference value or is below a lower limit of the reference value, and diagnoses a normality when the diagnostic data is within the range of the reference values.

[0012] According to the above invention, when the time when maintenance was performed on each rotating part of a plurality of rotating devices is set as a reference time and this reference time is input into the reference time input unit, the data accumulation unit accumulates vibration data of each rotating part when a predetermined time has elapsed from the reference time, the reference value creation unit creates a reference value for each rotating part, and the diagnosis unit can diagnose each rotating part at the predetermined diagnosis time based on this reference value.

[0013] This diagnostic device can update the reference values ​​for each rotating part of multiple rotating devices each time maintenance is performed, and can diagnose each rotating part based on the reference values. In other words, relative diagnostic results can be obtained for each rotating part of each rotating device based on the reference values ​​created at the installation site of the device in a plant or the like.

[0014] Therefore, even with limited information such as the reference time input to the reference time input unit and the vibration data acquired by each sensor during diagnosis, it is possible to obtain sufficient diagnostic results to serve as a guide for maintenance for the rotating parts of individual rotating equipment. Furthermore, because the amount of data required for diagnosis is small and data processing can be relatively simple, it is possible to provide a diagnostic device for rotating equipment that is inexpensive and easy to use.

[0015] In the rotating equipment diagnostic device of the present invention, the reference value memory unit may have an old reference value storage unit that stores an old reference value that was stored before the new reference value when the reference value creation unit attempts to create a new reference value for a certain period of time if there is an old reference value that was stored before the new reference value.

[0016] According to the above aspect, the old reference value storage unit stores the old reference value for a certain period of time, and by utilizing this old reference value, it becomes easier to check, for example, whether maintenance measures were appropriate, and it is possible to stably diagnose each rotating part of multiple rotating devices.

[0017] In the rotating equipment diagnostic device according to the present invention, the old reference value storage unit may be configured to store the old reference value at least during a period in which the reference value creation unit creates the reference value.

[0018] According to the above aspect, the old reference value storage unit is configured to store the old reference value at least during the period when the reference value creation unit creates the reference value. This prevents a situation in which no reference value exists between the time when the reference value creation unit creates the reference value after maintenance (preservation) of the rotating equipment and the time when the reference value creation unit creates the reference value (during the reference value creation period), and enables more stable and appropriate diagnosis of each rotating part of multiple rotating equipment.

[0019] The rotating machine diagnostic device according to the present invention may further include a display unit that displays at least the diagnostic result obtained by the diagnostic unit.

[0020] According to the above aspect, since the display unit having the above configuration is provided, the diagnostic results can be visually confirmed.

[0021] In the diagnostic device for rotating equipment according to the present invention, the diagnostic device has at least a display unit that displays the diagnostic results from the diagnostic unit, and the display unit may have an input prompting unit that displays a message prompting the user to input the reference time into the reference time input unit when the maintenance is performed.

[0022] According to the above aspect, the display unit has a reference time input promotion unit that displays a message urging the user to input a reference time into the reference time input unit when maintenance is performed on each rotating part of multiple rotating devices, thereby preventing the user from forgetting to input a new reference value into the reference time input unit when maintenance is performed on each rotating part. [Effects of the Invention]

[0023] In the present invention, the reference values ​​can be updated each time maintenance is performed on the rotating part of each rotating device, so that even rotating devices that have been used for a long period of time can be properly diagnosed, and even with limited information, it is possible to obtain necessary and sufficient diagnostic results that can serve as a guide for maintenance for the rotating part of each rotating device, thereby providing an inexpensive and easily usable diagnostic device. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a schematic configuration diagram showing an embodiment of a diagnostic device for a rotating machine according to the present invention; [Figure 2] 10 is a flowchart showing the process of creating a reference value in the diagnostic device. [Figure 3] 4 is a flowchart showing a procedure for diagnosing a rotating machine in the diagnostic device. [Figure 4] 3 is an explanatory diagram illustrating normal, caution, and abnormal conditions during diagnosis by the diagnostic device. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0025] (One embodiment of a diagnostic device for rotating equipment) Hereinafter, one embodiment of a diagnostic device for rotating equipment according to the present invention will be described with reference to the drawings. Fig. 1 is a schematic diagram of a diagnostic device 10 for rotating equipment according to the present invention (hereinafter, also simply referred to as "diagnostic device 10"). This diagnostic device 10 diagnoses the condition of each rotating part 3 (parts related to rotational operation, such as shaft parts in a motor rotor or pump impeller, and bearings that rotatably support the shaft parts) in a plurality of rotating equipment, such as motors, turbines, speed reducers, pumps, agitators, and blowers in a plant.

[0026] As shown in FIG. 1, this diagnostic device 10 is installed on each of the rotating parts 3 of a plurality of rotating devices 1 to be maintained, and is mainly composed of a sensor 5 that detects at least vibration data A from each rotating part 3, a processing unit 20 that performs diagnostic processing to determine whether or not there is an abnormality in the state of each rotating device 1 based on the vibration data A acquired by the sensor 5, and a display unit 60 that displays the diagnostic results, etc., from the processing unit 20.

[0027] 1, the processing unit 20 includes a reference time input unit 30, a data accumulation unit 32, a reference value creation unit 34, a reference value storage unit 36, a diagnosis time data acquisition unit 40, and a diagnosis unit 50. The reference value storage unit 36 ​​includes a previous reference value saving unit 38. The processing unit 20 includes a CPU, a memory, a storage medium such as an HDD or SSD, peripheral devices, programs, etc. The display unit 60 includes an input prompt unit 62.

[0028] The sensor 5 is capable of detecting at least vibration data A among various data generated in the rotating parts 3, such as shafts and bearings, of each rotating device 1, such as a motor or a pump, and may be, for example, a well-known vibration sensor. The vibration data A may be displacement, speed, acceleration, etc., depending on the vibration frequency of the rotating part 3. In addition to the vibration data, one or more pieces of data, such as sound, temperature, and light, may be used alone or in combination.

[0029] The sensor 5 is connected to at least the data storage unit 32 and the diagnostic data acquisition unit 40 by various communication means such as wired communication, wireless communication, communication via the Internet, etc. (hereinafter simply referred to as "various communication means such as wireless communication") Furthermore, the sensor 5 is provided with a data transmission unit (not shown), and this data transmission unit transmits vibration data A of the rotating unit 3 of each rotating device 1 detected by the sensor 5 to the data storage unit 32 and the diagnostic data acquisition unit 40 at predetermined timings.

[0030] Next, each component of the processing unit 20 will be described in detail.

[0031] The reference time input unit 30 inputs the time when maintenance was performed on each rotating part 3 as the reference time B for diagnosing each rotating device 1. In the present invention, "maintenance" of the rotating part 3 includes inspection, repair, servicing, replacement, adjustment, and other actions for restoring or maintaining the performance or function of the rotating part 3.

[0032] For reference time B, for example, the month, day, hour, and minute can be entered, such as XX month, △△ day, □□ hour XX minute, or only the month and day can be entered, such as XX month, △△ day, and furthermore, the Gregorian or Japanese calendar year can be entered, or even down to the second.

[0033] Furthermore, when inputting the reference time B, the worker who performed maintenance on each rotating part 3 may manually input it into the reference time input unit 30, or a detector or the like that can detect whether maintenance has been performed may be attached to the rotating part 3, and when maintenance has been performed on the rotating part 3, the reference time B may be automatically input into the reference time input unit 30 based on information from the detector or the like that maintenance has been performed.

[0034] When the reference time B is input manually, the diagnostic device 10 has various UIs (User Interfaces) for inputting the reference time B, such as a keyboard that is provided integrally with or separately from the processing unit 20, or a touch panel that is displayed on the display unit 60. When the display unit 60 is provided with a touch panel or the like for inputting the reference time, the reference time input unit 30 and the display unit 60 are connected to each other by various communication means such as wireless communication.

[0035] On the other hand, when the reference time B is input automatically, the diagnostic device 10 has an automatic input unit that automatically inputs the reference time B into the reference time input unit 30 based on maintenance information from the detector or the like.

[0036] The data storage unit 32 acquires and stores vibration data A of each rotating unit 3 detected by each sensor when a predetermined time has elapsed since the reference time B input to the reference time input unit 30.

[0037] That is, as described above, the vibration data A of the rotating part 3 of each rotating device 1 detected by the sensor 5 is sequentially transmitted to the data storage part 32 by the data transmission part, and the data storage part 32 selects and acquires the vibration data A of each rotating part 3 when a predetermined time has elapsed from the reference date B from among this vibration data A, and stores the vibration data A of each rotating part 3 respectively.

[0038] The time elapsed since the reference time B may be acquired in hourly units or in daily units (for example, 7 days). The vibration data A may be acquired continuously without interruption until a predetermined time has elapsed since the reference time B, or may be acquired intermittently within a range from the reference time B until the predetermined time has elapsed (for example, vibration data A of 10 seconds each time may be acquired twice a day). When the vibration data A is acquired intermittently, it is preferable that the intervals between acquisition timings are constant.

[0039] The reference value creating section 34 creates a reference value C having a predetermined range for each rotating section 3 based on the vibration data A stored in the data storing section 32 .

[0040] It is preferable that the reference value creation unit 34 uses a statistical method to create the reference value C for each rotating part 3 from the vibration data A stored in the data storage unit 32, based on at least one item selected from the average value of the vibration data A and the standard deviation of the vibration data A. As the statistical method, for example, multivariate analysis, supervised machine learning, or a combination of these can be used.

[0041] When based on the average value of the vibration data A, the reference value C is created by dividing the total value of the vibration data A accumulated in the data accumulation unit 32 by the number of pieces of vibration data A (the number of plots of the vibration data A). For example, if there are 14 pieces of vibration data A, twice a day for seven days, the average value of the vibration data A can be obtained by dividing the total value (total) of all the vibration data A by 14. The average value of the vibration data A may be a cut-off average or a trim average.

[0042] Furthermore, when creating the reference value C, in addition to the average value and standard deviation of the accumulated vibration data A, the reference value C may be created by processing the variance, median, maximum value, minimum value, skewness, kurtosis, etc. of the vibration data A, either singly or in combination. However, the reference value C shall not be created for the vibration data A by a method using FFT analysis or an absolute judgment value.

[0043] As shown in Figure 4, the reference value C (or the old reference value C' described later) does not refer only to a specific value, but has a certain range (for example, the reference value C may be XX to △△).

[0044] The reference value storage unit 36 ​​stores the reference value C created by the reference value creation unit 34. When the reference value creation unit 34 is about to create a new reference value C, if there is an old reference value C' (hereinafter also referred to as "old reference value C'") that was stored before the new reference value C, the reference value storage unit 36 ​​has an old reference value storage unit 38 that stores this old reference value C' for a certain period (for example, about 7 days).

[0045] As described above, the old reference value storage unit 38 stores the old reference value C' for a certain period of time, and the significance of this is to check whether or not the maintenance measures were appropriate, for example.

[0046] In other words, if the rotating part 3 of the rotating device 1 is diagnosed based on the just-updated reference value C shortly after updating the reference value C, the result will be normal, and an appropriate diagnostic result will not be obtained. Therefore, it is preferable to update to a new reference value C after obtaining a diagnostic result using the old reference value C', which makes it necessary to store the old reference value C' for a certain period of time. The old reference value storage unit 38 may have a function to erase the old reference value C' that is no longer needed at a predetermined timing.

[0047] Furthermore, the above-described old reference value storage unit 38 is configured to store the old reference value C' at least during the period in which the reference value creation unit 34 creates the reference value C. This is to prevent a situation in which the reference value creation unit 34 has no reference value during the reference value creation period after maintenance of the rotating device 1.

[0048] Furthermore, the relatively evaluated diagnostic results diagnosed based on the reference value C stored in the reference value storage unit 36 ​​and the relatively evaluated diagnostic results diagnosed based on the old reference value C' stored in the old reference value storage unit 38 are displayed on the display unit 60. That is, the reference value storage unit 36 ​​is connected to the display unit 60 by various communication means such as wireless communication, and has a function of inputting the diagnostic results to the display unit 60 as the reference value C or the old reference value C'.

[0049] The diagnostic data acquisition unit 40 acquires, at a predetermined diagnosis time, vibration data A of each rotating part 3 detected by the sensor 5 as diagnostic data D for each rotating part 3. The diagnostic data acquisition unit 40 also has a function of inputting the acquired diagnostic data D for each rotating part 3 to the diagnosing unit 50.

[0050] The diagnostic unit 50 compares the diagnostic data D acquired by the diagnostic data acquisition unit 40 with the reference value C (including the old reference value C'; the same applies to the following explanation) for each corresponding rotating unit 3 read from the reference value memory unit 36, and diagnoses the diagnostic data D as "abnormal" or "caution" if it exceeds the upper limit of the reference value C or is below the lower limit of the reference value C, and diagnoses the diagnostic data D as "normal" if it is within the range of the reference value C.

[0051] In this embodiment, as shown in FIG. 4, the diagnostic unit 50 diagnoses (1) the diagnosis data D as "Caution" when it exceeds the upper limit Cmax of the reference value C and is within a predetermined range, or when it is below the lower limit Cmin of the reference value C and is within a predetermined range; (2) the diagnosis data D as "Abnormal" when it exceeds the upper limit Cmax of the reference value C and the caution range, or when it is below the lower limit Cmin of the reference value C and the caution range; and (3) the diagnosis data D as "Normal" when it is within the range from the upper limit Cmax to the lower limit Cmin of the reference value C.

[0052] The above-described diagnostic results are displayed on the display unit 60. That is, the diagnostic unit 50 is connected to the display unit 60 by various communication means such as wireless communication, and has a function of inputting the created reference value C to the display unit 60. Note that the above-described processing unit 20, and the reference value creating unit 34, reference value storage unit 36, diagnostic unit 50, etc. that constitute the processing unit 20 may be configured, for example, by a program on an Internet network or on the cloud.

[0053] Next, the display unit 60 will be described in detail.

[0054] This display unit 60 may be a display integrally provided with the processing unit 20, a display separate from the processing unit 20, or a display of a mobile device terminal, etc., and is connected to the reference value memory unit 36 ​​and the diagnosis unit 50 via various communication means such as wireless communication.

[0055] The display unit 60 may be configured to display data using a web browser or the like via the Internet, a cloud system, etc. In this case, for example, data such as the vibration data A and the diagnostic data D can be uploaded to the cloud, and the reference value creation unit 34, the diagnostic unit 50, etc., which are programs on the cloud, can create the reference value C and the old reference value C', and the diagnostic results based on these can be viewed on the Internet via a web browser or the like.

[0056] The display unit 60 always displays the following information, while the information in (1) and (2) and (3) can be optionally displayed: (1) diagnostic information (diagnosis result) of the rotating part 3 of each rotating device 1 diagnosed by the diagnostic unit 50, such as "abnormal," "caution," or "normal," or error information in the event that diagnosis is not possible (failure to acquire data, error during transmission / reception, etc.); (2) maintenance history in the event that maintenance is performed; and (3) the date and time when the reference value C was created (reference value creation date and time).

[0057] The maintenance history in (3) above refers to the date and time when maintenance was performed, the details of the maintenance work (part inspection, part repair, part maintenance, part replacement, refilling of lubricating oil, etc.), etc.

[0058] In addition, the display unit 60 may be connected to the sensor 5 of the rotating part 3 of each rotating device 1, the reference time input unit 30, the data accumulation unit 32, and the diagnostic time data acquisition unit 40 via various communication means such as wireless communication.

[0059] In this case, the display unit 60 displays vibration data A detected by the sensor 5 in each rotating unit 3, the reference time B manually or automatically input to the reference time input unit 30, vibration data A at the time of creating the reference value accumulated in the data accumulation unit 32, and diagnostic data D acquired by the diagnostic data acquisition unit 40.

[0060] The display unit 60 also has an input prompting unit 62 that, when maintenance is performed, displays on the display unit 60 a message prompting the user to input the reference time into the reference time input unit 30. The input prompting unit 62 may be provided in a dedicated display area on the display unit 60, or may be configured to display a pop-up message on the display unit 60.

[0061] Furthermore, the display unit 60 has a selection display section that, when an old reference value C' exists, prompts the user to select whether or not to use this old reference value C'. This selection display section has a dedicated display area or is configured to display a pop-up.

[0062] As described above, when the display unit 60 has a touch panel or the like when manually inputting the reference time B, or when the display unit 60 is configured to display a pop-up of the selection display unit, the display unit 60 has the function of inputting information about the reference time B and whether or not to use the old reference value C' to the processing unit 20.

[0063] (Operation of diagnostic equipment for rotating equipment) Next, the operation of the diagnostic device 10 will be described.

[0064] First, a reference value C is created as shown in Fig. 2. First, a reference value B is manually input or automatically input into the reference time input unit 30 of the processing unit 20 (step S1).

[0065] Next, the data storage unit 32 selects and acquires the vibration data A of each rotating part 3 of each rotating device 1 when a predetermined time has elapsed from the reference time B from the vibration data A of the rotating part 3 of each rotating device 1 that has been detected by the sensor 5 and transmitted to the data storage unit 32, and stores the vibration data A (step S2).

[0066] Next, the reference value creation unit 34 creates a reference value C for each rotating unit 3 based on the vibration data A. First, it is determined whether or not an old reference value C' is stored in the old reference value storage unit 38 (step S3).

[0067] If the old reference value C' exists, a message prompting the user to select whether or not to use the old reference value C' is displayed on the selection display section of the display section 60 (step S4).

[0068] On the other hand, if the old reference value C does not exist in step S3, the reference value storage unit 36 ​​stores a new reference value C (which can also be said to be an updated reference value) (step S6), and the creation of the reference value is completed.

[0069] Furthermore, in the above step S4, if the old reference value C' is to be used, the reference value storage unit 36 ​​stores the old reference value C' (step S5), and the creation of the reference value is completed.

[0070] Next, as shown in FIG. 3, the state of the rotating part 3 in each rotating device 1 is diagnosed.

[0071] First, the diagnosis data acquisition unit 40 of the processing unit 20 acquires the vibration data A of each rotating part 3 detected by the sensor 5 at a specified diagnosis time as diagnosis data D for each rotating part 3, and inputs the vibration data A of each rotating part 3 at the time of diagnosis to the diagnosis unit 50 (step S10).

[0072] Next, the diagnosis unit 50 compares the diagnosis data D for each rotating unit 3 acquired by the diagnosis data acquisition unit 40 with the reference value C for each corresponding rotating unit 3 read from the reference value memory unit 36, and determines whether the diagnosis data D exceeds the upper limit of the reference value C or is less than the lower limit of the reference value C (step S11).

[0073] Then, if the diagnostic data D exceeds the upper limit of the reference value C or is below the lower limit of the reference value C, the diagnostic unit 50 diagnoses it as "abnormal" or "caution" (step S12), inputs this diagnostic result to the display unit 60, and the display unit 60 displays the diagnostic result, thereby completing the diagnosis.

[0074] On the other hand, if the diagnostic data D is within the range of the reference value C, the diagnostic unit 50 diagnoses it as "normal" (step S13), inputs this diagnostic result to the display unit 60, and the display unit 60 displays the diagnostic result, thereby completing the diagnosis.

[0075] (Action and effect) Next, the effects of the diagnostic device having the above configuration will be described.

[0076] According to the diagnostic device 10 having the above configuration, when the time when maintenance was performed on each rotating part 3 of a plurality of rotating devices 1 is designated as reference time B and this reference time B is input by the reference time input unit 30, the data accumulation unit 32 accumulates vibration data A of each rotating part 3 when a predetermined time has elapsed since reference time B, and the reference value creation unit 34 creates a reference value C for each rotating part 3, and the diagnostic unit 50 can diagnose each rotating part 3 at the predetermined diagnosis time based on this reference value C.

[0077] Incidentally, even if the rotating equipment 1 is used for a long period of time and the parts of the rotating part 3 (bearings, rotating shafts, etc.) break down, wear out, or deteriorate over time, if appropriate maintenance such as part replacement, repair, and adjustment is performed, the rotating equipment 1 can often still perform satisfactorily, although not to the same level as when it was new.

[0078] Furthermore, with this diagnostic device 10, the reference values ​​can be updated for each rotating part 3 of multiple rotating devices 1 each time maintenance is performed, and each rotating part 3 can be diagnosed based on the reference values.

[0079] That is, based on the reference values ​​created at the installation site of the equipment in a plant, etc., it is possible to obtain relative diagnostic results for the rotating parts of individual rotating equipment. In other words, a diagnostic device that employs an abnormality diagnostic method using FFT analysis diagnoses vibration data, etc. based on whether it contains data (waveform, noise) that can be diagnosed as abnormal, which is an absolute diagnostic method, so to speak.

[0080] In contrast, the diagnostic device 10 of the present invention can obtain relative diagnostic results that take into account various ever-changing factors of each individual rotating device 1, such as the usage status, usage manner, usage environment, and the effects of aging.

[0081] Therefore, with this diagnostic device 10, even with limited information, such as the reference time B input to the reference time input unit 30 and the vibration data A acquired by each sensor 5 during diagnosis, it is possible to obtain necessary and sufficient diagnostic results to serve as a guide for maintenance for the rotating part 3 of each rotating device 1. Furthermore, because the amount of data required for diagnosis is small and data processing can be relatively simplified, it is possible to provide a diagnostic device 10 that is inexpensive and easy to use.

[0082] Furthermore, in the diagnostic device 10 of this embodiment, the reference value memory unit 36 ​​has an old reference value storage unit 38 that stores an old reference value C' that was stored before the new reference value C when the reference value creation unit 34 attempts to create a new reference value C for a certain period of time.

[0083] According to the above aspect, the old reference value C' is stored for a certain period by the old reference value storage unit 38, and therefore the old reference value C' can be utilized. For example, it becomes easier to check whether or not maintenance measures were taken appropriately, and therefore it is possible to stably diagnose each of the rotating parts 3 of the multiple rotating devices 1.

[0084] It should be noted that after maintenance is completed, the old reference values ​​may be used without updating the reference values. For example, when major maintenance such as replacing important parts is performed on the rotating part 3 of the rotating device 1, it may be desirable to use the reference values ​​at that time (best reference values). In such a case, even if maintenance is performed on the rotating device 1 after that, it is possible to operate without updating the reference values. Even in this case, diagnosis can be performed using the best state of each rotating device 1 as the standard, rather than using an absolute diagnostic method such as an abnormality diagnosis method using FFT analysis.

[0085] Furthermore, in the diagnostic device 10 of this embodiment, the old reference value storage unit 38 is configured to store the old reference value C' at least during the period when the reference value creation unit 34 creates the reference value C.

[0086] According to the above aspect, the old reference value storage unit 38 is configured to store the old reference value C' at least during the period when the reference value creation unit 34 creates the reference value C. Therefore, it is possible to prevent a situation where no reference value exists (a blank state with no reference value) from occurring during the period (during the reference value creation period) when the reference value creation unit 34 creates an updated new reference value after maintenance (preservation) of the rotating device 1, and it is possible to more stably and appropriately diagnose each rotating part 3 of the multiple rotating devices 1.

[0087] Furthermore, the diagnostic device 10 of this embodiment has at least a display unit 60 on which the results of the diagnosis by the diagnostic unit 50 are displayed.

[0088] According to the above aspect, the diagnostic device 10 has the display unit 60 configured as above, so that the diagnostic results can be visually confirmed.

[0089] Furthermore, the diagnostic device 10 of this embodiment has at least a display unit 60 on which the diagnostic results obtained by the diagnostic unit 50 are displayed, and the display unit 60 has an input prompting unit 62 that displays a message prompting the user to input the reference time B into the reference time input unit 30 when maintenance is performed.

[0090] According to the above aspect, the display unit 60 has an input prompting unit 62 that displays a prompt to input a reference time into the reference time input unit 30 when maintenance is performed on each rotating unit 3 of multiple rotating devices 1, thereby preventing forgetting to input a new reference time B into the reference time input unit 30 when maintenance is performed on each rotating unit 3.

[0091] It should be noted that the present invention is not limited to the above-described embodiment, and various modified embodiments are possible within the scope of the gist of the present invention, and such embodiments are also included in the scope of the present invention. [Explanation of symbols]

[0092] 1···Rotating equipment, 3···Rotating section, 5···Sensor, 10···Diagnostic device for rotating equipment (diagnostic device), 20···Processing section, 30···Reference time input section, 32···Data accumulation section, 34···Reference value creation section, 36···Reference value memory section, 38···Previous reference value storage section, 40···Diagnostic time data acquisition section, 50···Diagnosis section, 60···Display section, 62···Input promotion section

Claims

1. a sensor installed in each of the rotating parts of a plurality of rotating devices to be maintained, the sensor detecting at least vibration data from each of the rotating parts; a reference time input unit that inputs a time point when maintenance was performed on each rotating unit as a reference time for diagnosing the rotating equipment; a data storage unit that acquires and stores the vibration data of each rotating part detected by each sensor when a predetermined time has elapsed since the reference time input unit; a reference value creation unit that creates a reference value having a predetermined range for each rotating part based on the vibration data stored in the data storage unit; a reference value storage unit that stores the reference value; a diagnostic time data acquisition unit that acquires the vibration data of each rotating part detected by the sensor at a predetermined diagnostic time as diagnostic time data; a diagnostic unit that compares the diagnostic data acquired by the diagnostic data acquisition unit with the reference values ​​for each corresponding rotating part read from the reference value storage unit, and diagnoses an abnormality or a warning when the diagnostic data exceeds an upper limit of the reference value or is below a lower limit of the reference value, and diagnoses the diagnostic data as normal when the diagnostic data is within the range of the reference value.

2. 2. The diagnostic device for a rotating machine according to claim 1, wherein the reference value storage unit includes an old reference value storage unit that stores an old reference value stored before the new reference value for a certain period of time when the reference value creation unit attempts to create the new reference value and there is an old reference value stored before the new reference value.

3. 3. The diagnostic device for a rotating machine according to claim 2, wherein the old reference value storage unit is configured to store the old reference value at least during a period in which the reference value creation unit creates the reference value.

4. 3. The diagnostic device for a rotating machine according to claim 1, wherein the diagnostic device has at least a display unit on which a result of the diagnosis by the diagnostic unit is displayed.

5. the diagnostic device has at least a display unit on which a diagnosis result by the diagnostic unit is displayed, 3. The diagnostic device for a rotating machine according to claim 1, wherein the display unit has an input prompt unit that displays a prompt to input the reference time into the reference time input unit when the maintenance is performed.

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