JP7034688B2 - Pneumatic actuated valve diagnostic system and pneumatic actuated valve diagnostic method - Google Patents

Description

The present invention relates to a diagnostic system for a pneumatically actuated valve and a method for diagnosing a pneumatically actuated valve.

Some pneumatic actuated valves as shown in Patent Document 1 and the like recognize an abnormality during operation. The one described in Patent Document 1 monitors an operation electric signal for controlling a control valve that controls the flow of pressure air flowing into a pneumatic cylinder, an operating air pressure sent to the pneumatic cylinder, and a displacement (stroke) of a valve rod. By doing so, the abnormal part of the pneumatically operated valve is identified and monitored.

Further, in an electric valve as shown in Patent Document 2, marking points made on the valve stem are photographed, and the axial stroke (elevating momentum) and strain amount of the valve stem are calculated from the image, and the electric valve is calculated by these. There is a method of diagnosing the presence or absence of abnormalities in.

The diagnostic device for the actuated valve described in Patent Document 3 is an actuated valve to which an LVDT (differential transformer) type valve opening sensor that detects the valve opening from the valve rod position is attached. By monitoring the air pressure signal of the air introduced into the operating valve, the operating state is monitored while the operating valve is operating normally.

Japanese Unexamined Patent Publication No. 7-119862 Japanese Unexamined Patent Publication No. 2010-85105 Japanese Unexamined Patent Publication No. 2009-210042

By the way, the pneumatically operated valve may be disassembled for internal inspection or the like. Therefore, after overhaul and inspection, when assembling and starting the pneumatically operated valve, it is necessary to confirm whether or not the pneumatically operated valve starts to operate normally.

In this case, the total length of the valve stem and the stroke of the valve stem differ depending on the pneumatically operated valve. There is a problem that it is difficult to apply. Further, the abnormality of the pneumatically operated valve occurs in various places such as a gland packing, a diaphragm, a spring, and a valve stem. There are various possible causes of the abnormality, such as a foreign substance being caught in the valve rod or a scratch on the valve stem. In this way, depending on the location where the abnormality occurs and the cause of the abnormality, an abnormality may occur only in the operating air pressure at the start of valve rod start (hereinafter, the operating air pressure is simply referred to as air pressure), and there is no abnormality in the subsequent air pressure. There is no abnormality in the air pressure at the start of starting of the valve stem, and there may be an abnormality only in the air pressure after that, and there are various patterns in the appearance of the abnormality in the air pressure. Therefore, in Patent Document 1 and Patent Document 2, when an abnormality occurs only in the operating air pressure at the start of starting of the valve stem and there is no abnormality in the subsequent air pressure, the abnormality of the pneumatically operated valve is detected with high accuracy. It may not be possible.

The LVDT type valve opening degree sensor described in Patent Document 3 is mainly provided for monitoring and controlling an important system of a plant during operation. That is, normally, the LVDT type valve opening sensor is provided only for a particularly important control valve (for example, about 1% of the entire control valve in a nuclear power plant) to control an important system. Most control valves are not provided with such an LVDT type valve opening sensor. Therefore, in the case of providing the LVDT type valve opening sensor as in Patent Document 3, most of the control valves (control valves not provided with the LVDT type valve opening sensor or the like) mainly installed in the power plant are used. Cannot be applied to inspection / adjustment work.

Further, in the method of acquiring the valve opening information with the LVDT type valve opening sensor, it is possible to monitor the operating state while the operating valve is operating normally, but after disassembling and inspecting, the pneumatically operated valve is used. There is a problem that it cannot be applied when assembling and starting. That is, when the operating valve is disassembled, the LVDT is removed from the operating valve, so that the correlation between the movement amount obtained from the LVDT and the valve opening degree is reset once. For this reason, in the case where the LVDT type valve opening sensor is provided, first, the correlation between the actual valve opening (for example, visually acquired) and the pressure value (acquired from a separately provided pressure gauge) is separately acquired, and other than the LVDT related. Only after all the adjustment work of the above is completed can the valve opening degree be associated with the movement amount obtained by the LVDT.

In view of the above problems, the present invention is a diagnostic system for a pneumatically operated valve that can easily diagnose an abnormality in a pneumatically operated valve with high accuracy when starting after assembling a pneumatically operated valve. And a method for diagnosing a pneumatically actuated valve.

The pneumatically actuated valve diagnostic system of the present invention moves in the axial direction to open and close the communication passage by a valve box having a communication passage for flowing fluid from the inflow port to the outflow port and air pressure introduced from the outside. This is a diagnostic system for pneumatically operated valves that diagnoses the presence or absence of abnormalities when starting after assembling a pneumatically operated valve equipped with a valve rod that controls the flow rate of fluid and a valve body provided integrally. The pneumatic measuring means for measuring the pneumatic pressure introduced into the pneumatically operated valve and the pneumatically operated position of the valve rod attached to the predetermined position of the valve rod are displayed to display the opening degree of the pneumatically operated valve. It is provided with an opening degree display means, an imaging means for acquiring an image of the opening degree display means by photographing the opening degree display means at predetermined time intervals, and a diagnostic means for diagnosing the presence or absence of an abnormality in the pneumatic actuated valve. The diagnostic means includes an opening calculation unit that calculates the opening degree of the pneumatically operated valve from the position of the opening degree display means in the image captured by the imaging means, an opening degree of the pneumatically operated valve, and the opening degree thereof. A synchronization unit that synchronizes the air pressure at the time of acquisition of the image corresponding to the opening, a correlation creating unit that creates a correlation between the opening of the pneumatically operated valve and the air pressure, an image corresponding to the start of the valve rod, and the relevant image. Start to specify the image taken immediately before the image Start to specify the air pressure at the start of start of the valve rod from the image specifying part at the start of start, the image corresponding to the start of start of the valve rod, and the image taken immediately before the image. It is equipped with a starting air pressure specifying part.

According to the diagnostic system for the pneumatically operated valve of the present invention, the opening degree display means is photographed at predetermined time intervals by the imaging means, and the correlation between the opening degree of the pneumatically operated valve and the pneumatic pressure is continuously and automatically acquired. can do. In addition, the corresponding image at the start of the valve stem and the image captured immediately before the image can be specified, and the air pressure at the start of the valve stem can be specified based on these images. That is, it is possible to track the behavior of the air pressure at the start of the valve rod start and the air pressure during the valve rod operation until the valve rod stops thereafter. This makes it possible to detect an abnormality in the pneumatically operated valve even when an abnormality occurs only in the air pressure at the start of starting of the valve stem or when an abnormality occurs only in the air pressure during the operation of the valve stem. Moreover, the simple configuration makes it easy to install and remove from the existing pneumatically operated valve, eliminating the need for permanent processing or modification such as installing the LVDT or laying the transmission line, and the existing pneumatically operated valve. It can be applied to valves.

The opening degree calculation unit stores in advance the position of the opening degree displaying means at the start of starting of the valve stem and the position of the opening degree displaying means stationary after starting on the image, and the air pressure is based on these positions. The opening degree of the type actuated valve is calculated. This makes it possible to accurately calculate the opening degree of the valve stem by a simple method.

In the above configuration, it is preferable that the imaging means is integrally attached to the pneumatic actuated valve. As a result, the image pickup means can acquire an image having little influence even if the pneumatic actuated valve vibrates.

In the configuration, the opening degree display means includes an index that moves together with the valve stem and has a predetermined color, and the diagnostic means recognizes the position of the valve stem by recognizing a predetermined color attached to the index. It is preferably provided with a color recognition unit. As a result, it is possible to cope with various shapes of pneumatically operated valves, and the versatility is high.

In the above configuration, it is preferable that the diagnostic means includes a determination unit for determining the presence or absence of an abnormality in the pneumatically operated valve from the correlation based on the correlation creation unit and the air pressure at the start of starting of the valve stem. This makes it possible to automatically determine the presence or absence of an abnormality.

The method for diagnosing a pneumatically operated valve of the present invention is a valve box having a communication passage for flowing fluid from an inflow port to an outflow port, and a valve box having an air pressure introduced from the outside to move in the axial direction to open and close the communication passage. This is a diagnostic method for a pneumatically operated valve that diagnoses the presence or absence of abnormalities when starting after assembling a pneumatically operated valve equipped with a valve rod that controls the flow rate of fluid and a valve body provided integrally. The opening display means, which is attached to the predetermined position of the valve rod, displays the axial position of the valve rod, and displays the opening degree of the pneumatically operated valve, is photographed at predetermined time intervals. While acquiring the image of, the pneumatic pressure to be introduced into the pneumatically operated valve is measured, the opening degree of the pneumatically operated valve is calculated from the position of the opening degree display means in the captured image, and the opening degree of the pneumatically operated valve is calculated. And the air pressure at the time of acquisition of the image corresponding to the opening degree are synchronized to create a correlation between the opening degree of the pneumatically operated valve and the air pressure, and the corresponding image at the start of the valve rod start and the image concerned. From the image taken immediately before, the air pressure at the start of valve rod start is specified, and the abnormality of the pneumatically operated valve is based on the correlation between the opening of the pneumatically operated valve and the air pressure and the air pressure at the start of valve rod start. It diagnoses the presence or absence.

The pneumatically actuated valve diagnostic system and the pneumatically actuated valve diagnostic method of the present invention have a simple configuration and can be applied to existing pneumatically actuated valves. This makes it possible to diagnose an abnormality in the pneumatically operated valve easily, at low cost, and with high accuracy when starting the pneumatically operated valve after assembling.

It is a simplified figure which shows the diagnostic system of the pneumatic actuating valve of this invention. It is a perspective view which shows the main part of the pneumatic actuating valve of FIG. It is a block diagram which shows the diagnostic means which constitutes the diagnostic system of the pneumatic actuating valve of this invention. It is a simplified diagram which shows an example of the image imaged by the image pickup means, (a) is a fully closed state of a valve rod, (b) is a fully open state of a valve rod. It is a simplified figure which shows the image which image | photographed with the image pickup means at the time of operation of a valve stem. It is a graph showing the correlation between the pneumatic pressure and the valve opening, (a) shows the behavior when there is an abnormality in a pneumatically operated valve, and (b) shows the behavior when there is no abnormality in a pneumatically operated valve. .. It is a flowchart of the diagnostic method of the pneumatic actuating valve of this invention.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 7.

The diagnostic system for the pneumatically operated valve of the present invention diagnoses the presence or absence of an abnormality in the pneumatically operated valve when it is first operated after assembling the pneumatically operated valve, and the pneumatic pressure at the start of starting the valve rod. By detecting the correlation with the valve opening degree, the presence or absence of abnormality in the pneumatically operated valve 1 is diagnosed. Assembling the pneumatically operated valve includes both the case where the once assembled pneumatically operated valve is disassembled and then reassembled, and the case where the pneumatically operated valve is assembled for the first time. In this embodiment, this pneumatically actuated valve diagnostic system is used, for example, in a radiation controlled area of a nuclear power plant.

In the present embodiment, the pneumatically operated valve 1 uses a normally operated type (a type in which the valve stem is lowered by supplying pneumatic pressure to close the valve) as shown in FIG. The pneumatic actuated valve 1 includes an actuated valve body 1a.

The actuating valve main body 1a includes a valve box 10 connected to a pipe (not shown), and a drive unit 12 installed via a yoke (frame body) 11 above the valve box 10. The inside of the valve box 10 is partitioned by a partition wall 13 and has a main body portion 16 having a communication passage 16 for flowing fluid from the inflow port 14 to the outflow port 15, and a gland packing 18 at the upper surface opening of the main body portion 17 via a gland packing 18. It is provided with a fixed upper lid 19 and a valve rod 21 provided by slidably penetrating the upper lid 19 and the gland packing 18 and integrally provided with a valve body 20. The upper end of the valve stem 21 is connected to the drive shaft 22.

The drive unit 12 includes a casing 24 separated into two upper and lower chambers 26a and 26b by a diaphragm 25. The diaphragm 25 is provided on a plate-shaped diaphragm plate 29 with an outer peripheral edge portion attached to the casing 24. The upper chamber 26a forms a pneumatic chamber by supplying the output air pressure for measurement from the pressure regulating valve 1b via the pipe 1c. The lower chamber 26b is open to the atmosphere and forms a spring chamber by accommodating the compression coil spring 28 that urges the diaphragm 25 upward.

The drive shaft 22 is fixed to the diaphragm plate 29. On the other hand, the lower end of the drive shaft 22 is connected to the upper end of the valve stem 21 as described above.

By introducing air pressure from the pressure regulating valve 1b into the upper chamber 26a, the diaphragm 25 descends against the compression coil spring 28, and the valve body 20 connected to the valve rod 21 is integrated with the drive shaft 22. The passage 16 is closed. Further, when the air pressure in the upper chamber 26a is lowered, the diaphragm 25 rises due to the urging force of the compression coil spring 28, and the valve body 20 connected to the valve rod 21 rises integrally with the drive shaft 22 and continues. The passage 16 is opened. In this way, the valve body 20 connected to the valve rod 21 moves in the axial direction to open and close the communication passage 16, thereby controlling the flow rate of the fluid.

In the pipe 1c connecting the operation valve main body 1a and the pressure adjusting valve 1b, the pipe 30 is further branched and provided, and the air pressure measuring means 40 is connected to the pipe 30. The air pressure measuring means 40 is a pressure sensor (pressure converter) capable of converting the pressure of the air introduced into the actuating valve main body 1a into an electric amount and measuring the pressure. The pneumatic measuring means 40 can be attached before the diagnosis of the presence or absence of an abnormality when starting the pneumatic actuated valve 1, and can be removed after the diagnosis. Therefore, the pneumatic measuring means 40 can be installed only when diagnosing the presence or absence of an abnormality when starting the pneumatic actuated valve 1 after assembling it.

The pneumatic actuated valve 1 is provided with an opening degree display means 31. The opening degree display means 31 includes, for example, a scale portion 32 installed on the yoke 11 and an index 33 provided integrally with the valve rod 21 and moving in the vertical direction together with the valve rod 21. The scale portion 32 displays the opening degree of the pneumatic actuated valve 1, the uppermost portion indicates an opening degree of 100% (fully open state), scales are provided at equal intervals, and the lowermost portion has an opening degree of 0. % (Fully closed state) is shown. The index 33 indicates one of the scale portions 32, and a predetermined color is applied to the tip portion of the index 33, for example, by attaching a colored tape 34 having a tapered tip shape (for example, red). There is.

As shown in FIG. 2, the image pickup means 36 is integrally attached to the yoke 11 of the pneumatic actuated valve 1 via the gripping means 35. That is, one grip portion 37a of the grip means 35 grips the image pickup means 36, and the other grip portion 37b of the grip means 35 grips the fixed portion 38 different from the yoke 11. The image pickup means 36 acquires an image 60 (see FIGS. 4 and 5) in which at least the index 33 is displayed, and is configured by, for example, a WEB (USB) camera in the present embodiment. It is desirable that the imaging means 36 can continuously capture images at short intervals. The image pickup means 36 can be attached before the diagnosis of the presence or absence of an abnormality when starting the pneumatic actuated valve 1, and can be removed after the diagnosis. Therefore, the image pickup means 36 can be installed only when diagnosing the presence or absence of an abnormality when starting the pneumatically operated valve 1 after assembling it.

As shown in FIGS. 1 and 3, the pneumatic measuring means 40 and the imaging means 36 are connected to the diagnostic means 41 for diagnosing the presence or absence of an abnormality in the pneumatic actuated valve 1. The diagnostic means 41 is composed of a computer, and in the present embodiment, it is composed of a tablet personal computer that is convenient to carry and install. As shown in FIG. 3, the diagnostic means 41 includes a pre-diagnosis information unit 42, a timer 43, a color recognition unit 44, an opening degree calculation unit 45, a synchronization unit 46, a correlation creation unit 47, and a start start time. It includes an image specifying unit 48, a starting air pressure specifying unit 49, a determination unit 50, and a memory 51.

The pre-diagnosis information unit 42 stores fully closed position information and fully open position information in the image 60 (see FIGS. 4A and 4B) of the pneumatically operated valve 1 to be diagnosed. For the fully closed position information and the fully open position information, the image 60 is continuously imaged while operating the valve rod 21 of the pneumatically operated valve 1 from the fully closed state to the fully open state in advance as a preparation before performing the diagnostic operation. Obtained by. That is, as shown in FIG. 4A, the range corresponding to the index in the image 60 in the fully closed state, that is, the starting point of the valve stem 21 (the place where the opening degree is 0% and the stationary state is changed to the operating state). The position of 61 is recognized, and for example, the position on the screen of the horizontal line passing through the center of gravity is set as the starting position 62. Further, as shown in FIG. 4B, the position of the range 61 corresponding to the index in the image 60 in the fully open state, that is, the end point of the valve stem (the place where the opening degree is 100% and the operating state changes to the stationary state). Is recognized, and for example, the position of the horizontal line passing through the center of gravity on the screen is set as the end point position 63. The pre-diagnosis information unit 42 stores information on the start position 62 and the end point position 63. The color recognition unit 44, which will be described later, recognizes the position of the range 61 corresponding to the index.

The timer 43 recognizes the time when the air pressure acquired by the air pressure measuring means 40 is acquired and the time when the image 60 captured by the image pickup means 36 is acquired. The air pressure information and the acquired image 60 are stored in the memory 51 together with the information at the time of acquisition.

The color recognition unit 44 recognizes the range 61 corresponding to the index in the acquired image 60, and in the present embodiment, recognizes the range 61 corresponding to the index based on the predetermined color applied to the index 33. do. Specifically, a predetermined color (red in the present embodiment) is applied to any place of the index 33 (the tip of the index 33 in the present embodiment), and the color recognition unit 44 starts from the image 60. The red range is extracted, and the extracted range is recognized as the range 61 corresponding to the index.

The opening degree calculation unit 45 calculates the opening degree of the pneumatic actuated valve 1 from the position of the opening degree display means (range 61 corresponding to the index) in the image 60 captured by the image pickup means 36. Specifically, when the image 60 is acquired by the image pickup means 36 while operating the valve rod 21 of the pneumatically operated valve 1 from the fully closed state to the fully open state (or from the fully open state to the fully closed state), in the image 60. An image showing which position (percentage position) the position of the horizontal line passing through the center of gravity of the range 61 corresponding to the index is between the start position 62 (0%) and the end point position 63 (100%). Calculate from the data. In FIG. 5, the position corresponding to the index is located in the middle between the start position 62 (0%) and the end point position 63 (100%), and the opening degree of the valve stem 21 is about 50%. It is shown that.

The synchronization unit 46 makes the air pressure of the pneumatically operated valve 1 stored in the memory 51 correspond to the opening degree of the pneumatically operated valve 1 calculated based on the images acquired at the same time as each acquisition of the pneumatic pressure. It is a thing. As a result, a plurality of information on the measurement of the pneumatic pressure and the opening degree of the pneumatic actuated valve 1 corresponding to the measurement is formed.

The correlation creating unit 47 creates a correlation between the opening degree of the pneumatically operated valve and the pneumatic pressure. That is, the correlation creating unit 47 uses a plurality of information on the pneumatic pressure synchronized in the synchronization unit 46 and the opening degree of the pneumatic actuated valve 1 corresponding to the measurement thereof, and makes it continuous. Correlation information between the opening degree of the pneumatically operated valve 1 and the pneumatic pressure is created. At this time, the correlation creating unit 47 may create and display a graph as shown in FIG.

The image specifying unit 48 at the start of starting identifies the image corresponding to the start of starting of the valve rod 21 and the image captured immediately before the image. That is, in the images acquired for diagnosis (that is, excluding the images acquired in the preparation before performing the diagnostic operation), the image whose opening is larger than 0% for the first time is extracted as the image at the start of starting, and the image thereof is extracted. The image at 0% immediately before is extracted as the image immediately before the start of starting.

The air pressure specifying unit 49 at the start of starting specifies the air pressure at the start of starting of the valve stem from the image corresponding to the start of starting of the valve stem and the image captured immediately before the image. That is, the air pressure at the time of acquisition of the image at the start of start extracted by the image specifying unit 48 at the start of start can be specified as the air pressure at the start of start.

The determination unit 50 diagnoses the presence or absence of an abnormality in the pneumatically operated valve 1 based on the correlation between the opening degree of the pneumatically operated valve 1 and the pneumatic pressure and the air pressure at the start of starting of the valve stem 21. For example, the diagnostic means 41 uses the correlation between the opening degree of the pneumatically operated valve 1 and the air pressure when the pneumatically operated valve 1 was operated last time, the data of the air pressure at the start of starting of the valve stem 21, and the reference thereof. The values and the like are stored, and the determination unit 50 compares the correlation between the opening degree of the pneumatically operated valve 1 and the air pressure at the time of diagnosis and the air pressure at the start of starting the valve rod 21 and whether the two are different. , Whether they match or differ, but the difference value is within a preset range.

Next, a method of diagnosing the presence or absence of an abnormality when starting the pneumatically operated valve after assembling it after disassembling it, for example, will be described using the diagnostic system for the pneumatically operated valve of the present invention. The diagnostic system for the pneumatically operated valve of the above embodiment is installed in the existing pneumatically operated valve 1. Specifically, the air pressure measuring means 40 is provided in the pipe 30 branched from any position of the pipe 1c, and the air pressure measuring means 40 is connected to the diagnostic means 41. Further, the image pickup means 36 is attached to the yoke 11 and the image pickup means 40 is connected to the diagnostic means 41 so that the opening degree display means 31 is located at a position where the image can be taken. The opening degree display means 31 may be provided in the existing pneumatic actuated valve 1, or may be provided in this step.

Next, the initial setting before making a diagnosis is performed (step S1). That is, in the pneumatically operated valve 1 to be diagnosed, the image pickup means 36 operates the valve rod 21 of the pneumatically operated valve 1 from the fully closed state to the fully open state at predetermined time intervals (for example, every 0.1 seconds). ) Acquires the image 60. As a result, the pre-diagnosis information unit 42 identifies the image 60 (see FIG. 4A) at the fully closed state, that is, the starting point (0%) of the valve stem 21, and color recognition is performed in the fully closed state image. The unit 44 recognizes the position of the range 61 corresponding to the index, marks the position on the screen of the horizontal line passing through the center of gravity, and sets the starting position 62 on the image. Further, the pre-diagnosis information unit 42 identifies an image 60 (see FIG. 4B) at the end point (100%) of the valve rod 21 in the fully open state, and the color recognition unit 44 is an index in the image in the fully open state. The position of the range 61 corresponding to the above is recognized, the position on the screen of the horizontal line passing through the center of gravity is marked, and the end point position 63 is set on the image. In this way, the start position 62 and the end point position 63 are stored in the pre-diagnosis information unit 42.

In the pneumatically operated valve 1 with the initial settings as described above, the index 33 is photographed at predetermined time intervals by the image pickup means 36 while the valve rod 21 is operated from the fully closed state to the fully open state. While acquiring an image, the pneumatic pressure measuring means 40 measures the pneumatic pressure introduced into the pneumatically operated valve 1 (step S2). At this time, the timer 43 recognizes the time when the air pressure acquired by the air pressure measuring means 40 is acquired and the time when the image 60 captured by the image pickup means 36 is acquired, and the air pressure information and the acquired image 60 are used. It is saved in the memory 51 together with the information at the time of acquisition (step S3).

The opening degree calculation unit 45 calculates the opening degree of the pneumatically operated valve in each image from the index range 61 in the image (step S4). That is, the color recognition unit 44 extracts the red range from the image 60 and recognizes the extracted range as the range 61 corresponding to the index. Then, in each image, the position on the screen of the horizontal line passing through the center of gravity of the range 61 corresponding to the recognized index is from the start position 62 (0%) to the end point position 63 (100%). Calculate from the image data which position is in between.

The synchronization unit 46 makes the air pressure of the pneumatically operated valve 1 stored in the memory 51 correspond to the opening degree of the pneumatically operated valve 1 calculated based on the images acquired at the same time as each acquisition of the pneumatic pressure. Therefore, a plurality of information on the measurement of the pneumatic pressure and the opening degree of the pneumatic actuated valve 1 corresponding to the measurement is formed. Then, the correlation creating unit 47 uses a plurality of information on the pneumatic pressure synchronized in the synchronization unit 46 and the opening degree of the pneumatic actuated valve 1 corresponding to the measurement thereof, and makes it continuous. Correlation information between the opening degree of the pneumatically operated valve 1 and the pneumatic pressure is created (step S5). At this time, the correlation creating unit 47 may create and display a graph as shown in FIG. Note that FIG. 6A shows the behavior when the pneumatically operated valve 1 has an abnormality, and FIG. 6B shows an example of the behavior when the pneumatically operated valve 1 has no abnormality.

The opening of the image specifying unit 48 at the start of start is the first among the images stored in the memory 51 among the images acquired for diagnosis (that is, excluding the images acquired in the preparation before performing the diagnostic operation). An image larger than 0% is extracted as an image at the start of starting, and an image at 0% immediately before that is extracted as an image immediately before the start of starting (step S6). After that, the start-start air pressure specifying unit 49 specifies the air pressure at the time of acquisition of the image at the start start extracted by the start start image specifying unit 48 as the air pressure at the start of the start (step S7).

The determination unit 50 diagnoses the presence or absence of an abnormality in the pneumatically operated valve 1 based on the correlation between the opening degree of the pneumatically operated valve 1 and the pneumatic pressure and the air pressure at the start of starting of the valve stem 21 (step S8). That is, the determination unit 50 determines whether or not there is an abnormality in the pneumatically operated valve 1 based on the correlation between the opening degree of the pneumatically operated valve 1 and the pneumatic pressure and the data of the pneumatic pressure at the start of starting of the valve stem 21. do. For example, if there is an abnormality in either the opening degree of the pneumatically operated valve 1 and the air pressure and the air pressure at the start of starting of the valve stem 21, there is an abnormality in one of the pneumatically operated valves 1. Judge.

As described above, in the pneumatically operated valve 1 with the initial setting, a method of diagnosing the presence or absence of an abnormality in the pneumatically operated valve 1 while operating the valve rod 21 from the fully closed state to the fully open state has been described. The presence or absence of an abnormality in the pneumatically operated valve 1 may be diagnosed while the valve rod 21 is in the fully open state and the valve rod 21 is operated from the fully closed state to the fully open state.

In the pneumatic actuated valve diagnostic system and the pneumatic actuated valve diagnostic method of the pneumatic actuated valve of the present invention, the behavior of the air pressure at the start of the valve rod start and the air pressure during the valve rod operation until the valve rod is stopped thereafter. Can be tracked. This makes it possible to detect an abnormality in the pneumatically operated valve 1 even when an abnormality occurs only in the air pressure at the start of valve rod start or when an abnormality occurs only in the air pressure during valve rod operation. Moreover, it is easy to attach and detach to the existing pneumatic actuated valve 1 with a simple configuration, and there is no need for permanent processing or modification such as installation of LVDT or laying of transmission line, and the existing pneumatic type. It can be applied to the actuating valve 1. As a result, when starting the pneumatically operated valve 1 after assembling it, it is possible to easily diagnose an abnormality in the pneumatically operated valve 1 at low cost and with high accuracy.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be modified in various ways. For example, the image pickup means 36 is preferably mounted integrally with the yoke, but can be mounted at a place other than the yoke (another mounting place). The pneumatic actuated valve 1 is not limited to the one shown in the illustrated example, and can be used for various types as long as the drive source is pneumatic. For example, in the embodiment, the pneumatically operated valve 1 that opens as the valve stem 21 rises has been described, but the present invention also applies to the pneumatically operated valve 1 that opens as the valve stem 21 descends. You can also. In this case, the 0% position in the embodiment is the fully open position, and the 100% position in the embodiment is the fully closed position. The scale 32 can be omitted. In the embodiment, the colored tape 34 is attached to the tip of the index 33, but it may have a predetermined color by marking with, for example, magic. The shooting interval is preferably 0.1 seconds or less, but is not limited to this. The timer 43 may be built in the air pressure measuring means 40 and the imaging means 36, respectively. The operator may determine whether or not the pneumatically operated valve 1 is abnormal from the graph showing the correlation between the air pressure displayed on the display means and the valve opening degree without providing the determination unit 50. The diagnostic means 41 may be another mobile information terminal, for example, a notebook computer, a desktop computer, or the like. In the embodiment, the other grip portion 37b of the grip means 35 grips the fixed portion 38 different from the yoke 11, but the other grip portion 37b may also grip the yoke 11.

1 Pneumatic actuated valve 10 Valve box 14 Inflow port 15 Outflow port 16 Continuous passage 20 Valve body 21 Valve rod 31 Opening display means 33 Index 36 Imaging means 40 Pneumatic measuring means 41 Diagnostic means 43 Timer 45 Opening calculation unit 46 Synchronous unit 47 Correlation creation unit 48 Start-up image identification unit 49 Start-up air pressure specification unit 50 Judgment unit

Claims (6)

It is integrated with a valve box having a communication passage for flowing fluid from the inflow port to the outflow port, and a valve rod that controls the flow rate of the fluid by moving in the axial direction and opening and closing the communication passage by air pressure introduced from the outside. It is a diagnostic system for a pneumatically operated valve that diagnoses the presence or absence of an abnormality when starting after assembling a pneumatically operated valve equipped with a valve body provided for the purpose.
Pneumatic measuring means for measuring the air pressure introduced into the pneumatically operated valve, and
An opening display means provided at a predetermined position of the valve rod, displaying the axial position of the valve rod, and displaying the opening degree of the pneumatically operated valve.
An image pickup means for acquiring an image of the opening degree display means by photographing the opening degree display means at predetermined time intervals.
It is equipped with a diagnostic means for diagnosing the presence or absence of abnormalities in the pneumatically operated valve.
The diagnostic means is
An opening calculation unit that calculates the opening of the pneumatically operated valve from the position of the opening display means in the image captured by the imaging means.
A synchronization unit that synchronizes the opening degree of the pneumatically operated valve with the air pressure at the time of image acquisition corresponding to the opening degree.
A correlation creation unit that creates a correlation between the opening of a pneumatically operated valve and pneumatic pressure,
An image specifying part at the start of starting to specify the image corresponding to the start of the valve stem and the image captured immediately before the image, and the image specifying part at the start of starting.
A pneumatically operated valve provided with a start-start pneumatic pressure specifying part that specifies the air pressure at the start of the valve stem from the image corresponding to the start of the valve stem and the image taken immediately before the image. Diagnostic system. The opening degree calculation unit stores in advance the position of the opening degree display means at the start of starting of the valve stem and the position of the opening degree display means stationary after the start of the valve stem on the image, and the air pressure is based on these positions. The diagnostic system for a pneumatically operated valve according to claim 1, wherein the opening degree of the type operated valve is calculated. The diagnostic system for a pneumatically operated valve according to claim 1 or 2, wherein the imaging means is integrally attached to the pneumatically operated valve. The opening degree display means includes an index that moves together with the valve stem and has a predetermined color, and the diagnostic means has a color recognition unit that recognizes the position of the valve stem by recognizing a predetermined color attached to the index. The diagnostic system for a pneumatically operated valve according to any one of claims 1 to 3, wherein the system is provided. The diagnostic means according to claim 1, further comprising a determination unit for determining the presence or absence of an abnormality in the pneumatically operated valve from the correlation based on the correlation creation unit and the air pressure at the start of starting of the valve rod. Item 4. The diagnostic system for a pneumatic actuation valve according to any one of items 4. It is integrated with a valve box having a communication passage for flowing fluid from the inflow port to the outflow port, and a valve rod that controls the flow rate of the fluid by moving in the axial direction and opening and closing the communication passage by air pressure introduced from the outside. It is a diagnostic method of a pneumatically operated valve for diagnosing the presence or absence of an abnormality when starting after assembling a pneumatically operated valve provided with a valve body.
An image of the opening opening display means, which is attached to a predetermined position of the valve stem, displays the axial position of the valve rod, and displays the opening degree of the pneumatically operated valve by photographing at predetermined time intervals. While acquiring, measure the pneumatic pressure to be introduced into the pneumatically operated valve,
The opening degree of the pneumatically operated valve is calculated from the position of the opening degree display means in the captured image, and the opening degree of the pneumatically operated valve is synchronized with the air pressure at the time of acquiring the image corresponding to the opening degree. , Create a correlation between the opening of the pneumatically operated valve and the pneumatic pressure, and
The air pressure at the start of the valve stem is specified from the image corresponding to the start of the valve stem and the image taken immediately before the image.
A method for diagnosing a pneumatically operated valve, which comprises diagnosing the presence or absence of an abnormality in the pneumatically operated valve based on the correlation between the opening degree of the pneumatically operated valve and the pneumatic pressure and the air pressure at the start of starting of the valve rod.

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