JP2920900B2 - Piping internal diagnostic device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piping internal diagnostic device for externally diagnosing clogging or thinning of piping in a chemical plant.

[0002]

2. Description of the Related Art Conventionally, an ultrasonic flaw detector has been known as a device for inspecting the inside of a pipe such as a water supply pipe or a pipe for cooling and heating or the state of adhesion of sludge. This ultrasonic flaw detector radiates an ultrasonic wave into the inside of a pipe, analyzes the reflected wave, and diagnoses a state inside the pipe. However, with the method of diagnosing using ultrasonic waves, it is difficult to make an accurate diagnosis when cavities or air bubbles are present in a clogged portion inside the pipe. On the other hand, there is also known a method in which an inspector strikes a pipe with a hammer having a built-in acceleration sensor and detects the vibration of the pipe at that time with an acceleration sensor installed in the pipe to diagnose the inside of the pipe. However, this method using a hammer is inconvenient to use because it is difficult to make accurate judgments because the manner of hitting the hammer varies depending on the number of people, and a large analyzer is required. Therefore, it is not always practical. For this reason, at present, abnormal locations of pipes (points of internal clogging and wall thinning) are estimated in advance from a decrease in flow rate during plant operation,
When the plant stops, pipes near the estimated location
In many cases, a method is employed in which a system is partially removed following a system, and an abnormal portion is searched for by an internal visual inspection.

[0003]

However, in such a conventional method in which the pipe is manually removed and visually inspected with the estimated abnormal portion as a guide,
There is a problem that the inspection cannot be performed unless the operation of the plant is stopped, and there is a problem that much time is required for the inspection. In addition, with the current method that relies on visual inspection, it may be difficult for even a skilled person to determine,
There has been a problem that unnecessary inspections and inspection omissions at necessary locations occur. In addition, in particular, in the inspection of a chemical solution pipe which may cause a chemical injury, there is a problem that an inspector is exposed to a risk of a chemical injury in a trimming operation for the inspection. The present invention has been made in view of such problems of the prior art, and a pipe internal diagnostic apparatus capable of quantitatively diagnosing external clogging or thinning of pipes such as chemical plant pipes even during plant operation. The purpose is to provide.

[0004]

According to a first aspect of the present invention, there is provided an apparatus for diagnosing inside a pipe, the apparatus comprising: a vibrator configured to continuously apply a predetermined vibration to a pipe; Two vibration detectors for detecting vibration of a pipe due to vibration, two vibration detectors provided to face each other via the vibrator, and A processing unit that receives input and performs predetermined signal processing; and a display unit that displays an output from the processing unit. The vibrator and the vibration detectors are connected to each other with a predetermined interval. The vibration exciter and each of the vibration detectors are configured to slide integrally on the outer surface of the pipe.

[0005]

As described above, in the piping internal diagnosis apparatus according to the present invention, the detecting unit is configured such that the vibrator for applying a predetermined vibration to the pipe and the vibration detector for detecting the vibration of the pipe caused by the vibration are mutually fixed. Because they are linked via an interval,
When the detector is brought into contact with the outer surface of the pipe to drive the vibrator, the vibration of the pipe caused by the vibration is automatically detected by the vibration detector, and the state of the detected vibration is displayed on the display. You. In the present invention, the detection unit is configured such that the vibrator and the vibration detector can slide integrally on the outer surface of the pipe, and the vibrator continuously vibrates. With this configuration, the inspector can continuously vibrate while sliding the detection unit in the vicinity of a portion where the pipe is presumed to be likely to be abnormal. it can. This allows the inspector to
The presence or absence of an abnormal part and the degree of the abnormality can be determined from the vibration state sequentially displayed on the display unit. Further, in the present invention, by providing two vibration detectors and providing the two vibration detectors to face each other via the vibrator, the reaction of the vibration by the vibrator is achieved. To the left and right 2
It becomes possible to detect simultaneously by two vibration detectors. This makes it possible to diagnose the internal state of the piping around the exciter while comparing the vibrations of the left and right pipings of the exciter.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional view showing a detection head unit 10 of a pipe internal diagnostic device according to one embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line − in FIG. 1, and FIG. It is a perspective view showing a diagnostic device main part (a processing part and a display part). In FIGS. 1 and 2, reference numeral 1 denotes a vibrating rod for vibrating the pipe 2, and 3 denotes a solenoid for driving the vibrating rod 1. The solenoid 3 drives the drive plate 5 urged upward by a spring 4 to move the resin head 6 attached to the lower surface of the end of the drive plate 5 up and down. on the other hand,
The vibrating rod 1 is vertically movably inserted into a through hole 7 a of the base 7, and is normally urged upward by a spring 8 so that a lower end 1 b thereof is located at a position separated from the outer surface of the pipe 2. ing. When the resin head 6 is driven by the solenoid 3 and hits the upper end 1a of the vibrating rod 1, the vibrating rod 1 is driven downward in the figure, and the lower end 1b vibrates the outer surface of the pipe 1. It has become.

In the base 7 of this embodiment, through holes 7b are respectively formed at the left and right positions of the through hole 7a in the figure, and a vibration transmission rod 13 is inserted into each of the holes 7b. I have. Lower end 13a of these vibration transmission rods 13
Are in contact with the outer surface of the pipe 2, respectively. Above these vibration transmission rods 13, an acceleration sensor 9 composed of a piezoelectric element or the like is attached. The vibrating rod 1
The vibration of the pipe 2 caused by the vibration by the vibration transmission rod 1
The vibration is transmitted to the lower end 13 a of the motor 3, and is detected by the acceleration sensor 9 via the vibration transmission rod 13.
Silicon rubbers 15 and 16 for preventing resonance are interposed between the vibration transmission rod 13 and the base 7.

In FIG. 1, reference numeral 17 is inserted through a hole of a chassis 19 fixed to the base 7, and a portable diagnostic device main body 25 shown in FIG.
This is an adapter for electrically connecting the solenoid 3 and the start switch 20. Start switch 20
Is for driving the solenoid 3 when the vibration to the pipe is started. Further, as shown in FIG. 2, on the lower surface of the base 7 of the present embodiment, support legs 21 and 22 are provided at left and right positions in the drawing of the respective vibration transmission rods 13 (not shown in FIG. 1). There). These support legs 21,
22 is in contact with the outer surface of the pipe 2 and
Are provided so that they can be stably mounted or slid on the pipe 2. And each of these support legs 21,
22 is urged downward by springs 23 and 24, respectively, so that it can cope with various pipes having different diameters.

Next, FIG. 3 shows a portable diagnostic device main body in the piping internal diagnostic device of the present embodiment. The diagnostic device main body 25 supplies a drive voltage to the solenoid 3 of the detection head unit 10. The examiner can set various measurement modes by operating each control button 26 of the diagnostic device main body 25. The measurement mode includes setting of the number of continuous vibrations and strength, setting of a display method of an analysis result of detected vibration, and the like. Further, a detection signal from the acceleration sensor 9 of the detection head unit 10 is input to the diagnostic device main body 25. The diagnostic device 25 performs signal processing according to a preset measurement mode and displays the processing result.

FIG. 4 is a block diagram showing an example of the configuration of the signal processing / display unit in the diagnostic device main body 25. In FIG. 4, reference numeral 31 denotes a waveform processing circuit that receives a detection signal from the acceleration sensor 9 and performs waveform processing such as predetermined amplification and shaping, and 32 samples the waveform signal from the waveform processing circuit 31 at a predetermined cycle. An A / D converter for digitizing 33 receives a digital signal from the A / D converter 32, performs predetermined arithmetic processing, and outputs the result to a D / A converter 35 or a display 36. Is a storage device that stores vibration waveform data of various parts of the plant piping in a normal state and exchanges data with the microcomputer 33. 35 is a device that converts data from the microcomputer 33 into analog signals, 37 is a D / A converter that outputs the signal to the D / A converter 37.

As shown in FIG. 3, the display unit 36 displays a vibration detection waveform of the inspection target part detected by the acceleration sensor 9 and a normal state vibration waveform of the relevant part stored in the storage unit 34 in advance. Is also displayed. Here, FIG. 5A shows an example of the vibration waveform in the normal state of the inspection target part stored in the storage device 34 in advance. FIG. 5 (b)
Is a vibration waveform detected by the acceleration sensor 9 and shows an example of a vibration waveform when a vibration is applied to a closed portion of the pipe. The microcomputer 33 has a diagnostic program incorporating know-how of a skilled person, for example, comparison of amplitude, comparison of attenuation rate, and vibration from excitation to detection of vibration of respective vibration waveforms in a normal state and an inspection. A program for judging the presence or absence and degree of abnormality in the piping at the time of inspection from data such as a comparison of transmission time is stored. The result of the determination by the microcomputer 33 (for example, the degree of clogging of the pipe or the degree of wall thinning of the pipe) is displayed on a level meter 37 (see FIG. 3). The inspector can easily determine the presence or absence of the abnormal state of the pipe and the degree of the abnormality.

Further, in the present embodiment, as described above, the acceleration sensors 9 are provided at two positions on the left and right of the vibrating rod 1, respectively. The locations where the two acceleration sensors 9 are provided may be equidistant from each other with respect to the vibrating rod 1,
The intervals may be different from each other. Since the acceleration sensors 9 are provided at two positions, the present embodiment can be used as follows. That is, the pipe 2 vibrates due to the vibration, and the transmission time until the vibration is detected by the acceleration sensor 9 varies depending on the degree of clogging or the thickness reduction of the vibrating part of the pipe 2. Therefore, the distance between the vibrating rod 1 and each of the two acceleration sensors 9 is fixed in advance, and the time required for the vibration and the vibration detection by each of the acceleration sensors 9 is measured and compared. Whether the condition of the left and right parts of the rod 1 is the same or different,
Alternatively, it becomes possible to predict what kind of abnormality is present.

Next, the operation of the piping internal diagnosis device according to the present embodiment will be described with reference to FIG. In FIG. 6A,
The piping internal diagnostic device includes a detection head unit 10 and a diagnostic device main body 2.
5 are connected by a cable. The detection head unit 10 is provided with a grip 10a so that the inspector can easily operate the detection head unit 10. When inspecting the pipe 2, the detection head unit 10 is connected to the pipe 2
The start button 20 is operated to apply vibration, and the display device 36 of the diagnostic instrument main body 25 displays a vibration waveform of the detected test part and a normal state vibration waveform of the corresponding part. . Then, the inspector determines whether there is an abnormality while comparing the two waveforms. Alternatively, a program for judging the presence / absence and degree of abnormality of the pipe at the time of inspection as described above is stored in the microcomputer 33 in advance, and the judgment result is displayed on the level meter 37.

Further, the inspector may find the abnormal part while sliding the vicinity of the pipe part which is predicted to be likely to have an abnormality in advance with the detection head unit 10. In this case, it is set in advance that the vibration by the vibration rod 1 is continuously performed at a predetermined cycle, and the inspection result is sequentially displayed on the display 36 or the level meter 37 while the detection head unit 10 is slid. Display them and check for abnormalities. FIG. 6B is a diagram illustrating a state in which the detection head unit 10 scans and inspects the vicinity of a portion of the pipe 2 where a clogged portion 41 due to a highly viscous chemical solution or the like occurs. FIG. 6C is a diagram illustrating a state in which the detection head unit 10 scans and inspects the vicinity of a portion of the pipe 2 where the thinning 42 due to corrosion by a chemical solution or the like has occurred.

In this embodiment, the detection head section 10 which directly contacts the pipe 2 and the diagnostic instrument main body 25 including the microcomputer 33 and the display 36 are separately constructed, and both are connected by a cable. However, the present invention is not limited to this. For example, a processing unit including a microcomputer or the like and a display unit may be integrally formed with the detection head unit 10.

[0016]

As described above, in the piping internal diagnosis apparatus according to the present invention, the detecting section includes the vibrator for applying predetermined vibration to the pipe and the vibration detector for detecting this vibration at a predetermined distance from each other. When the inspector drives the vibrator by abutting this detector on the outer surface of the pipe, the vibration of the pipe caused by this vibration is automatically detected by the vibration detector. And the state of the detected vibration is displayed on the display unit. Therefore, even during plant operation,
The internal condition of the pipe can be diagnosed from the outer surface of the pipe, unnecessary inspections and omissions at required locations can be eliminated, and the inspection time can be reduced. In addition, since the exciting force is kept constant and the distance between the vibrator and the vibration detector is kept constant, the internal state of the pipe can be diagnosed with high accuracy and quantitatively. Further, even in the inspection of a chemical pipe which may cause a chemical injury, a high-precision inspection can be performed from the outside, so that a risk of a chemical injury in a conventional cutting operation for inspection can be eliminated. . In particular, in the present invention, the detection unit is configured so that the vibrator and the vibration detector can slide integrally on the outer surface of the pipe, and continuously vibrates the vibrator. In this way, the inspector should continuously vibrate while sliding this detection part in the vicinity of the part where the pipe is presumed to be likely to be abnormal. Can be.
Therefore, the state of the vibration can be sequentially displayed on the display unit while the detection unit is slid, and the presence or absence of an abnormal portion and the degree of the abnormality can be more easily determined. Further, in the present invention, by providing two vibration detectors and providing the two vibration detectors to face each other via the vibrator, the reaction of the vibration by the vibrator is achieved. Can be simultaneously detected by the two left and right vibration detectors. This makes it possible to diagnose the internal state of the piping around the exciter while comparing the vibrations of the left and right pipings of the exciter.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a detection head unit of a piping internal diagnosis device according to one embodiment of the present invention.

FIG. 2 is a partial cross-sectional view illustrating a detection head unit of the piping internal diagnosis device according to the embodiment.

FIG. 3 is a perspective view showing a diagnostic device main body of the piping internal diagnostic device according to the present embodiment.

FIG. 4 is a block diagram showing a signal processing / display unit of a diagnostic device main body of the piping internal diagnostic device according to the present embodiment.

FIG. 5A is a waveform diagram showing a normal-state vibration waveform displayed on a display of a diagnostic device main body of the pipe internal diagnostic device according to the present embodiment, and FIG. 5B is a vibration waveform of a portion in a closed state; FIG.

FIG. 6 is a diagram for explaining a use state of the piping internal diagnosis device according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exciting rod 2 Piping 3 Solenoid 9 Acceleration sensor 10 Detecting head part 10a Grip part 22 Support leg 25 Diagnostic device main body 33 Microcomputer 36 Display 37 Level meter

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01B 17/00-17/04

Claims (1)

(57) [Claims] 1. A vibrator configured to continuously apply a predetermined vibration to a pipe, and a vibrator configured to detect vibration of the pipe caused by the vibration of the vibrator.
A plurality of vibration detectors, two vibration detectors provided to face each other via the vibrator, and a processing unit for performing predetermined signal processing in response to an input from each of the vibration detectors And a display unit for displaying an output from the processing unit. The vibrator and each of the vibration detectors are connected to each other via a predetermined interval, and the vibrator and each of the vibrations are provided. A diagnostic device inside a pipe, wherein the detector is configured to be able to slide integrally on the outer surface of the pipe.