WO2023176494A1 - Dispositif de détection de défaillance - Google Patents

Dispositif de détection de défaillance Download PDF

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Publication number
WO2023176494A1
WO2023176494A1 PCT/JP2023/007946 JP2023007946W WO2023176494A1 WO 2023176494 A1 WO2023176494 A1 WO 2023176494A1 JP 2023007946 W JP2023007946 W JP 2023007946W WO 2023176494 A1 WO2023176494 A1 WO 2023176494A1
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WO
WIPO (PCT)
Prior art keywords
pointer
detection device
failure
failure detection
standard deviation
Prior art date
Application number
PCT/JP2023/007946
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English (en)
Japanese (ja)
Inventor
卓海 仁科
昌洋 辻本
智子 植木
哲也 池本
智寿 吉江
Original Assignee
シャープ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2023176494A1 publication Critical patent/WO2023176494A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D13/00—Component parts of indicators for measuring arrangements not specially adapted for a specific variable
    • G01D13/22—Pointers, e.g. settable pointer

Definitions

  • the present disclosure relates to a failure detection device.
  • This application claims priority to Japanese Patent Application No. 2022-042039 filed in Japan on March 17, 2022, the contents of which are incorporated herein.
  • the state of the system is stabilized by measuring the pressure, temperature, flow rate, etc. of piping and managing the state.
  • a device such as a circular instrument panel or a rectangular display panel, which indicates detected values with an analog pointer, is generally used.
  • the value indicated by the pointer of an analog meter is read and taken out to the outside wirelessly.
  • the device is attached to a meter that has a scale plate with a scale, a pointer, and a transparent cover plate that covers the scale plate and the pointer, and is equipped with an IC chip and an antenna, and can transmit stored information by radio waves in a non-contact manner.
  • a method for calibrating a meter equipped with an IC tag unit and an IC tag unit is disclosed. In this way, according to Patent Document 1, the value indicated by the pointer can be read and taken out wirelessly without impairing the calibration state and visibility of the analog meter by being retrofitted to the analog meter.
  • the present disclosure provides a failure detection device that can detect failures of analog instruments.
  • an analog meter includes a housing, a pointer provided in the housing, a magnet attached to a rotation axis of the pointer, and a sensor unit attached to a front side of the analog meter.
  • the sensor unit is characterized in that a failure is determined based on a change in the magnetic field of the magnet caused by a slight movement of the pointer.
  • FIG. 1 is a front view schematically showing a failure detection device according to the present disclosure.
  • FIG. 2 is a front view of the analog meter.
  • FIG. 3 is an AA cross-sectional view schematically showing the failure detection device according to the present disclosure.
  • FIG. 4 is a front view schematically showing a failure detection device according to the present disclosure.
  • FIG. 5 is an image diagram showing how a magnetic sensor reads the movement of a magnet that rotates with the rotation axis.
  • FIG. 6 is a diagram showing voltage versus angle.
  • FIG. 7 is a flow diagram when an analog meter reads measurements.
  • FIG. 8 is a flow diagram in which the failure detection device according to the present disclosure determines a failure.
  • FIG. 9 is a flow diagram of a modification example in which the failure detection device according to the present disclosure determines a failure.
  • FIG. 1 is a front view schematically showing a failure detection device 100 according to the present disclosure.
  • FIG. 2 is a front view of the analog meter 10.
  • FIG. 3 is an AA cross-sectional view schematically showing the failure detection device 100 according to the present disclosure.
  • FIG. 4 is a front view schematically showing the failure detection device 100 according to the present disclosure.
  • a failure detection device 100 according to the present disclosure includes an analog meter 10 and a sensor unit 20.
  • the analog meter 10 includes a housing 11 of the analog meter 10 and a pointer 12 provided inside the housing 11.
  • Examples of the analog instrument 10 include a pressure gauge, a thermometer, a flow meter, a power meter, a liquid level gauge, and the like.
  • Examples of the analog instrument 10 include a circular instrument panel and a rectangular display panel.
  • the housing 11 accommodates the dial 17 in addition to the pointer 12.
  • the dial 17 is provided within the housing 11 and has numerical values 15 and/or scales 16 written thereon.
  • the pointer 12 points to a numerical value 15 and/or a scale 16.
  • the transparent plate 18 is placed over the housing 11 so as to cover the front side (+Z direction) of the dial 17 and the hands 12.
  • the magnet 14 is attached to the rotation axis 13 of the pointer 12. As the rotation axis 13 rotates in response to the slight movement of the pointer 12, the rotation angle of the pointer 12 is read from changes in the magnetic field of the magnet 14 attached to the rotation axis 13, and the measured value of the analog meter 10 is read. . Further, the angle ⁇ (+ ⁇ , ⁇ ) of the pointer 12 as shown in FIG. 4 is measured to determine a failure. The method for reading measured values and the method for determining failure will be described in detail later.
  • the magnet 14 can also be attached to the pointer 12, or the pointer 12 itself can be the magnet 14. Further, the magnet 14 can be a permanent magnet or an electromagnet.
  • the diameter M of the sensor unit 20 is preferably ⁇ 25 mm to ⁇ 40 mm.
  • the sensor unit 20 has a function of reading the movement of the pointer 12 of the analog meter 10 and outputting the measured value of the analog meter 10 as a digital signal.
  • the sensor unit 20 is installed on a transparent substrate 18 provided above the pointer 12 of the analog meter 10 (at the opening of the housing 11). Before installation, the transparent substrate 18 is removed and the magnet 14 is attached to the rotary cram 13 of the pointer 12 as described above. With this configuration, the magnetic sensor in the sensor unit 20 can read the magnetism of the magnet 14.
  • the magnet 14 attached to the rotating shaft 13 rotates together with the rotation of the rotating shaft 13, as shown in FIG.
  • the magnetic sensor 21 reads the magnetic movement of the magnet 14 and outputs the values of Sin ⁇ and Cos ⁇ with respect to the angle ⁇ as voltages as shown in FIG. Based on this output, the angle ⁇ is calculated. For example, when the output of Sin ⁇ is 0.0 V, if Cos ⁇ is 1.5 V, the angle is 0 degree, and if Cos ⁇ is ⁇ 1.5 V, ⁇ is 180 degrees. Since the angle ⁇ corresponds to the rotation angle of the pointer 12, it becomes possible to read an analog measurement value from ⁇ .
  • a Bourdon tube pressure gauge usually has a Bourdon tube, a scale plate, and a pointer inside the housing, and the slight movement caused by the elastic stress of the Bourdon tube due to fluctuations in the measured fluid pressure is reflected in the pointer through an enlargement mechanism.
  • the system transmits the information and instructs the pointer to rotate on the scale plate.
  • the Bourdon tube pressure gauge detects subtle changes in the Bourdon tube, so it is easily affected by, for example, pulsation of the measuring fluid, vibrations of the pressure gauge attached, the tube body, etc., and it is difficult to see with the naked eye. Even if the pointer appears to be stationary, it is always moving slightly.
  • FIG. 7 shows the flow when reading the measured values of the analog meter 10.
  • reading the angle of the pointer 12 of the analog meter 10 with the magnetic sensor 21 of the magnet 14 is expressed as angle measurement. After starting the measurement and performing the measurement a specified number of times, averaging processing is performed.
  • the device shown above has a high reading resolution, and when it is used to read the movement of the pointer, the measured value is unstable because it reads the minute movement mentioned above. Therefore, it is necessary to take measurements repeatedly and average them.
  • the failure detection device 100 outputs the display of the pointer 12 of the analog measuring instrument 10 as a digital value as described above, but also has a function of detecting that the analog measuring instrument 10 has failed. Have it together. The reason why a failure detection function is necessary and the detection means are described below.
  • a bourdon tube measures deformation based on pressure and displays it with a mechanical pointer, so failures may occur due to metal fatigue or deformation of the bourdon tube or due to sticking of the pointer.
  • the failure detection device 100 makes it possible to easily detect failures in analog instruments. Under normal conditions, the pointer of an analog meter pulsates and makes slight movements, so the failure detection device 100 according to the present disclosure detects a failure by the change in the magnetic field of the magnet that occurs when the pointer shakes (rotates) due to the slight movement of the pointer. do.
  • FIG. 8 is a flow diagram in which the failure detection device 100 according to the present disclosure determines a failure.
  • the failure detection device 100 can use a small analog meter 10 or the like.
  • the diameter N of the analog meter 10 is 60 mm or less and 50 mm or less.
  • the pulsation of the pointer 12 of a small analog instrument 10 such as these diameters is very small and has a small amplitude due to the small size of the pointer 12, so it is impossible to judge the presence or absence of pulsation with the naked eye. be.
  • the failure detection device 100 according to the present disclosure can detect failures even in small analog instruments 10.
  • the sensor unit 20 reads the change in the magnetic field of the magnet 14 attached to the pointer 12, measures the relative angle of the pointer 12 a specified number of times from the initial value, and stores the data. For example, repeat this every second or faster, at 2 milliseconds. By measuring in 2 milliseconds, data can be obtained 500 times in 1 second.
  • the measurement interval can be set arbitrarily. If the interval is too short, the power consumption of the measurement system will increase, and if it is too long, it will be too late to notice changes in measured values. Set the time taking into consideration the needs of the measurement system.
  • the standard deviation of the relative angle is calculated using the stored data.
  • the standard deviation can be calculated based on data obtained by calculating the above-mentioned average value in order to stabilize the measured value, or can be calculated from data obtained by measuring a specified number of times.
  • the standard deviation is approximately 1.16°.
  • the measured standard deviation is larger than the threshold value, it is determined to be normal. On the other hand, if the measured standard deviation is smaller than the threshold, it is determined that there is a failure. If the standard deviation is large, it means that the variation in the measured values is large. This shows that the pointer 12 is operating normally by following the random micro-movements of the object to be measured. On the other hand, when the standard deviation is small, it means that the variation in measured values is small. In this case, it is considered that the pointer 12 is stuck and unable to follow the random micro-movement of the object to be measured, and it can be determined that the pointer 12 is malfunctioning.
  • the purpose of setting the threshold value is that the swing amplitude of the pointer 12 due to pulsation varies depending on the location where the analog meter 10 is installed and the degree of vibration etc. Therefore, in setting the threshold value, it is necessary to measure the angle of the analog instrument 10 at the installation location, obtain the standard deviation, and set the threshold value in consideration of temperature fluctuations, vibration changes, and the like.
  • the threshold value can be determined by obtaining the standard deviation during normal operation when the device is installed and using that as the threshold value.
  • the threshold value can also be in a range greater than 0° and less than or equal to 0.5°.
  • the length from the center of the pointer 12 to the scale 16 of the ⁇ 50 analog meter 10 is approximately 20 mm.
  • the moving distance of the tip is approximately ⁇ 0.085 mm.
  • the minimum distance that humans can judge with the naked eye is said to be 0.1 mm, so the above range is preferable. Therefore, failure can be determined with high accuracy.
  • FIG. 9 is a flow diagram of a modification example in which the failure detection device 100 according to the present disclosure determines a failure. As shown in FIG. 9, parameters and dead zones are used to determine failure.
  • the angle measurement and standard deviation are performed in the same manner as in the embodiment shown in FIG. In the embodiment shown in FIG. 8, a standard deviation is set to determine a failure, but in this modification, a failure is determined based on parameters acquired during calibration.
  • the parameter is the standard deviation of the analog instrument 10 when it is not operating. Further, a dead zone is set by the user, and the determination is made by comparing the parameter ⁇ dead zone with the standard deviation obtained by frequently measuring angles.
  • the standard deviation is larger than the sum of the parameter and the dead zone, it is determined to be normal. On the other hand, if the standard deviation is smaller than the sum of the parameter and the dead zone, it is determined that there is a failure.
  • the dead zone is preferably in the range of -0.5° to 0.5°.
  • the fixed period can be set every half day or every day.
  • the failure detection device 100 As described above, according to the failure detection device 100 according to the present disclosure, it is possible to detect a failure of the analog meter 10.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)

Abstract

La présente divulgation concerne un dispositif de détection de défaillance apte à détecter une défaillance d'un instrument analogique.　Selon la présente divulgation, un dispositif de détection de défaillance est caractérisé en ce qu'il comporte : un instrument analogique comprenant un boîtier, un indicateur disposé dans le boîtier et un aimant fixé au centre axial rotatif de l'indicateur ; et une unité de capteur fixée à un côté avant de l'instrument analogique, l'unité de capteur déterminant une défaillance à partir d'un changement du champ magnétique de l'aimant se produisant en raison du micromouvement de l'indicateur.
PCT/JP2023/007946 2022-03-17 2023-03-03 Dispositif de détection de défaillance WO2023176494A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-042039 2022-03-17
JP2022042039 2022-03-17

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WO2023176494A1 true WO2023176494A1 (fr) 2023-09-21

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004325155A (ja) * 2003-04-23 2004-11-18 Calsonic Kansei Corp 車両計器装置の検査方法および検査装置並びに車両計器装置用検査プログラム
JP2005207947A (ja) * 2004-01-23 2005-08-04 Toshiba Corp シンクロ装置の動作制御装置
JP2005338054A (ja) * 2004-04-28 2005-12-08 Nissan Motor Co Ltd 車載表示計の自動評価装置
JP3161399U (ja) * 2010-05-18 2010-07-29 長野計器株式会社 指針読取装置
JP2020072614A (ja) * 2018-11-02 2020-05-07 株式会社近計システム ガス絶縁遮断器のガス圧力監視装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004325155A (ja) * 2003-04-23 2004-11-18 Calsonic Kansei Corp 車両計器装置の検査方法および検査装置並びに車両計器装置用検査プログラム
JP2005207947A (ja) * 2004-01-23 2005-08-04 Toshiba Corp シンクロ装置の動作制御装置
JP2005338054A (ja) * 2004-04-28 2005-12-08 Nissan Motor Co Ltd 車載表示計の自動評価装置
JP3161399U (ja) * 2010-05-18 2010-07-29 長野計器株式会社 指針読取装置
JP2020072614A (ja) * 2018-11-02 2020-05-07 株式会社近計システム ガス絶縁遮断器のガス圧力監視装置

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