JPH07209263A - Method and device for diagnosing deterioration of pipe holder - Google Patents

Abstract

(57) [Summary] [Purpose] To be able to grasp the deterioration of the pipe holder securely and automatically. [Composition] A hydraulic pipe 1 through which a fluid such as a liquid circulates and which is laid via supporters 3, 4, 5, 6, 7, and 8.
In the above, the vibration sensor 9 detects vibrations in the vicinity of the supporter group arranged in the hydraulic pipe 1 at different intervals such as L ₁ , L ₂ , L ₃ , L ₄ , and L ₅ , and this vibration is detected. Based on the amplitude level corresponding to the natural frequency of each region divided by the distances L ₁ , L ₂ , L ₃ , L ₄ , and L ₅ ,
The deterioration of the supporter in the area divided by the distances L ₁ , L ₂ , L ₃ , L ₄ , and L ₅ is specified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe holder for automatically detecting deterioration of a holder such as a supporter for mounting and supporting a hydraulic pipe on a fixed side and deterioration of a mounting state. The present invention relates to a deterioration diagnosis method and apparatus.

[0002]

2. Description of the Related Art For example, a hydraulic pipe is attached to a fixed surface such as an indoor / outdoor floor, a building wall or a ceiling by using a holder (supporter). The holder is assembled with multiple parts including U-shaped parts to surround the pipe,
The fixed surfaces are arranged at regular intervals. The piping is arranged by bending according to the situation of the building or site, and the position of the oil destination, or a valve is provided in the middle.

By the way, when sending oil, pressure is usually applied. Therefore, when a valve provided in the middle of the pipe is operated from "open" to "closed", a large pressure shock is generated on the oil supply side with this valve as a boundary.
This impact is transmitted to the holder and causes the fixed portion to rock.

As a result, the holder may be cracked, the fastening portion of the bolt may be loosened, or corrosion may be broken. When such a situation occurs, an excessive load is applied to the pipe, causing looseness or cracks in the joint portion, and in the worst case, oil leakage occurs, which greatly affects the operation. Therefore, maintenance personnel regularly patroll along the pipes to perform maintenance by visual inspection and palpation.

[0005]

However, as described above, the conventional diagnostic method in which the maintenance staff circulates along the pipe and performs maintenance inspection by visual inspection and palpation depends on the experience and intuition of the maintenance staff. Therefore, it is inevitable to miss the inspection, and the number of patrols is limited, and in many cases it is laid in a place where inspection is difficult to perform, and deterioration diagnosis is limited.

Therefore, an object of the present invention is to provide a method of diagnosing deterioration of a pipe holder, which can reliably and automatically grasp the deterioration of the pipe holder.

[0007]

In order to achieve the above-mentioned object, the present invention allows a fluid such as a liquid to flow and
In the pipes laid via the above holders, the vibrations in the vicinity of the holders arranged in the pipes are detected by making the mutual intervals different, and the vibrations are unique to each section area of the pipes. Deterioration of the holder that specifies the divided area is determined based on the amplitude level corresponding to the frequency.

In order to generate the vibration in the pipe, there is a method of forcibly generating the vibration in the vicinity of the deterioration diagnosis target of the pipe when the vibration is detected.

Further, in order to immediately recognize the occurrence of deterioration, a warning can be issued when the amplitude level exceeds an allowable level.

[0010]

According to the above-mentioned means, the vibration generated in the pipe vibrates at a different frequency, that is, a natural frequency, in each of the areas divided by the adjacent holders, and the vibration is generated at each frequency depending on the degree of deterioration of the holder. Focusing on indicating the level value, the deterioration is diagnosed from the magnitude of the level value.

Therefore, the deterioration of the holder can be automatically diagnosed at an early stage and the place of deterioration can be specified. As a result, fluid leakage can be prevented, productivity can be improved, and response accuracy such as hydraulic operation can be improved.
Product quality can be improved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a laying diagram for explaining a method for diagnosing deterioration of a pipe holder according to the present invention. Further, FIG. 2 is a vibration waveform diagram generated in each part of the pipe having the configuration of FIG.

A valve 2 is provided in the middle of the hydraulic pipe 1, and a supporter 3, 4, 5 serving as a holder is provided in the preceding stage thereof.
6, 7 and 8 are attached at non-uniform intervals and are fixed to the ceiling surface of the building by bolts or the like (the supporter is also provided at a stage subsequent to the valve 2, but not shown here).
In FIG. 1, the supporters 3, 4, 5, 6, 7, and 8 are
The distance between adjacent supporters is set to be shorter toward the front stage. That is, the distance L _{1 from} each other
, L ₂ , L ₃ , L ₄ , L ₅ are attached.

Further, a vibration sensor 9 is mounted on the surface of the hydraulic pipe 1 near the valve 2 to detect the vibration generated in the pipe when the valve 2 is opened / closed, and convert the mechanical vibration into an electric signal and output it. . A diagnostic device 10 is connected to the vibration sensor 9, and the frequency and output level of the vibration sensor 9 are analyzed to determine an abnormality in the supporter.

In the above structure, when the valve 2 which has been in the "open" state is closed, the pressure in the pipe upstream of the valve 2 increases rapidly. At this time, the shock of the pressure change causes vibration in the pipe. With this vibration, a resonance tube is formed with the supporter as one section. If all the supporters are provided at the same intervals, the natural frequencies generated between the supporters are the same. However, when the distances between the supporters are made different as shown in FIG. 1, the natural frequencies generated in the respective sections are different, and as shown in FIG. 2, the frequencies f ₁ , f ₂ , f
It vibrates at different frequencies like ₃ , f ₄ ... In this case, the shorter the interval between the supporters, the higher the vibration frequency. In the example of FIG. 1, the frequencies are in the relationship of f ₁ <f ₂ <f ₃ <f ₄ ... As shown in FIG. become. Then, the vibration level of each frequency is increased as the supporter is deteriorated (loose attachment, cracking, corrosion breakage, etc.) and the degree thereof is severe.

Therefore, the frequencies f ₁ , f ₂ , f
It is possible to determine the degree of deterioration from the magnitude of the output level by knowing in advance which section of the hydraulic pipe 1 the respective generation regions of ₃ , f _4, ... Are.
For example, as shown in FIG. 2B, the support interval (L ₂
+ L ₃ ) When a peak value of the amplitude spectrum, which was not present in the normal state, occurs in the frequency f ′ region corresponding to the arrangement natural frequency, the frequency analysis results show that ₃ between L _{2 and} L ₃ is obtained.
The second pipe support (supporter 5) was judged to be abnormal, and when that pipe support was inspected, the pipe support bolts were loosened and pipe support was incomplete. I was able to discover it without any trouble. This piping diagnosis method, as described above, prevents abnormal fatigue of the piping due to abnormal cyclic support for a long period of time and prevents fatigue damage, and also accurately estimates the abnormal location of the piping support. You can Frequency, f ₁
, F ₂ , f ₃ , f _4, ... For example, a method of hitting the hydraulic pipe 1 with a hammer and analyzing the frequency generated at that time using a measuring instrument such as a spectrum analyzer is known. is there.

As described above, since the relationship between the frequency f and the vibration level can be grasped, it is possible to manage the trend by recording it on the recorder and examining the change, and comparing the vibration level with the threshold value. By installing the diagnostic device 10 that issues an alarm when there is a vibration frequency exceeding the threshold value, maintenance and repair can be promptly dealt with.

In the above description, the pipe is a hydraulic pipe, but the pipe is not limited to oil, and may be a pipe through which a liquid such as water or a gas such as gas flows.
Further, in FIG. 1, for convenience of explanation, one vibration sensor 9
And the six supporters to be monitored are shown in the figure.
Such a combination may be arranged continuously, or may be provided only in a place particularly affected by a pressure change (for example, in the vicinity of a valve).

FIG. 3 is a block diagram showing a deterioration diagnosis apparatus using the method of the present invention. Note that, in FIG. 3, the same reference numerals are used for the same elements as those shown in FIG. 1, and thus duplicated description will be omitted below. Further, in FIG. 3, only the supporters 3, 4, 5, 6, 7 are targeted.

In FIG. 3, the configuration excluding the vibration sensor 9 corresponds to the diagnostic device 10. The vibration sensor 9 includes an amplifier 1 that amplifies the output signal of the vibration sensor 9 to a level required for subsequent processing.
1 is connected. The amplifier 11 has a frequency f ₁ ,
f _2, f _3, f ₄ each bandpass filter and its output signal to a center frequency of the consisting rectifier circuit for a DC voltage the filter unit 12a~12d are connected in parallel.

One input terminal of each of the comparators 13a to 13d is connected to each of the filter sections 12a to 12d. A threshold V _S is applied to the other input terminal of each of the comparators 13a to 13d, and this threshold V _S is compared with the output voltage of each of the filter units 12a to 12d. An upper limit value and a lower limit value can be set for the threshold value, and the value can be changed for each frequency.

A driver 14 for driving LEDs (light emitting diodes) 15a to 15d is connected to each of the output terminals of the comparators 13a to 13d. Further, an OR circuit 16 is connected to each of the output terminals of the comparators 13a to 13d, and an alarm circuit 17 for driving a buzzer 18 is connected to the OR circuit 16.

In the above configuration, when the vibration sensor 9 outputs a frequency signal having a level as shown in FIG. 2, this signal is amplified by the amplifier 11, and the filter unit 12
a to 12d. Filter units 12a to 1
2d is a respective center band pass filter frequencies are different, only the signal components of each frequency _{f 1, f 2, f 3} , f 4 is extracted, additionally the AC signal is converted into a DC voltage. This DC voltage is proportional to the amplitude (level) of the vibration frequency.

Frequency f₁ , F₂ , F₃ , F_FourTo each of
The corresponding DC voltage is thresholded in the comparators 13a to 13d.
Value V_SCompared to. As shown in FIG._SBeyond
(In this case, below the lower limit) is the frequency
Number f₂ , F₃DC voltage corresponding to the
An output voltage is generated from b and 13c. These two voltages are
It is applied to the OR circuit 16 and its output voltage is "L" level.
Changes to "H" level. This voltage will trigger an alarm
The road 17 is activated and the buzzer 18 is driven. This
A warning sound is emitted. This makes it acceptable to supporters
It can be seen that there is no level of deterioration.

On the other hand, the two output voltages of the comparators 13b and 13c are applied to the driver 14 and the LEDs 15b and 15c.
LED1 is driven by each output transistor connected to
Only 5b and the LED 15c are turned on, and the supporters 4, 5,
It can be seen that at least two of the six have deteriorated, and it is possible to facilitate the on-site identification.

In the above embodiment, the valve 2 was diverted as the vibration source for obtaining the characteristics as shown in FIG. 2, but it is also possible to separately provide a means for hammering the pipe without using this. Good.

[0028]

Since the present invention is configured as described above, it has the following effects. In the method for diagnosing deterioration of a pipe holder according to claim 1, in a pipe in which a fluid such as a liquid flows and which is laid via two or more holders, vibrations in the vicinity of the holder arranged in the pipe are The deterioration of the holder that identifies the divided area is detected based on the detected amplitude and the amplitude level corresponding to the natural frequency of each divided area of the pipe. In the above, since the holders are arranged in the pipe at different intervals, the deterioration of the holders can be automatically diagnosed at an early stage and the deterioration place can be specified. As a result, leakage of fluid can be prevented, productivity can be improved, and response accuracy such as hydraulic operation can be improved, so that product quality can be improved.

In the method for diagnosing deterioration of a pipe holder according to a third aspect of the present invention, when the vibration is detected, the vibration is forcibly generated in the vicinity of the deterioration diagnosis target of the pipe.
The deterioration diagnosis of the holder can be easily and easily performed.

In the method for diagnosing deterioration of the pipe holder according to the fourth aspect of the present invention, a warning is issued when the amplitude level exceeds the allowable level, so that the maintenance personnel can be immediately notified of the occurrence of deterioration.

[Brief description of drawings]

FIG. 1 is a piping installation diagram illustrating a method for diagnosing deterioration of a piping holder according to the present invention.

FIG. 2 is a vibration waveform diagram generated in each part of the pipe having the configuration of FIG.

FIG. 3 is a block diagram showing a deterioration diagnostic device using the method of the present invention.

[Explanation of symbols]

 1 Hydraulic Piping 2 Valve 3, 4, 5, 6, 7, 8, Supporter 9 Vibration Sensor 10 Diagnostic Device 11 Amplifier 12a to 12d Filter Section 13a to 13d Comparator 14 Driver 15a to 15d LED 16 OR Circuit 17 Alarm Circuit 18 Buzzer

Claims (6)

[Claims] 1. In a pipe in which a fluid such as a liquid flows and which is laid via two or more holders, a vibration in the vicinity of the holder arranged in the pipe is detected, and the pipe is accompanied by the vibration. A deterioration diagnosing method for a pipe holder, characterized in that the deterioration of the holder specifying the divided area is determined based on the amplitude level corresponding to the natural frequency of each divided area. 2. The deterioration diagnosing method for a pipe holder according to claim 1, wherein the holders are arranged in the pipe at different intervals. 3. The method of diagnosing deterioration of a pipe holder according to claim 1, wherein vibration is forcibly generated in the vicinity of a deterioration diagnosis target of the pipe when the vibration is detected. 4. The method for diagnosing deterioration of a pipe holder according to claim 1, wherein a warning is given when the amplitude level exceeds an allowable level. 5. A holder provided in a pipe through which a fluid such as a liquid circulates and which is laid via two or more holders, a means for detecting a vibration in the vicinity thereof, and the detected vibration Deterioration diagnosis apparatus for a pipe holder, comprising means for determining deterioration of a holder specifying the divided area based on an amplitude level corresponding to a natural frequency of each divided area of the pipe. . 6. The means for determining deterioration of each holder is
The deterioration diagnosis device for a pipe holder according to claim 5, wherein an output from each vibration sensor is compared with a preset reference output, and a warning is issued based on the comparison result.