JPS6338137A - Diagnosis device for deterioration of lead-clad cable - Google Patents

Abstract

PURPOSE:To facilitate the estimation of the life of a lead-clad cable by digitizing the output voltage from a sensor device for measuring repulsion hardness and making angle correction in accordance with the program preliminarily loaded in a memory device and arithmetic processing unit. CONSTITUTION:A rigid body including a magnetic material is brought into collision against the lead-clad cable and the change of the speed right before and after the collision of the rigid body is detected by a sensor 1. The output of the sensor 1 is inputted to a CPU 4 after amplification 2 and A/D conversion 3. The memory 5 stores the information on the correction of the measuring angle of the sensor 1 and the information on the judgement of the life of the lead-clad cable. The CPU 4 calculates the angle between the moving direction of the rigid body and the perpendicular direction from the speed just before the collision of the rigid body against the lead-clad cable and determines the change of the repulsion hardness of the lead-clad cable from the speed change just before and after the collision of the rigid body. Said unit corrects the repulsion hardness of the lead-clad cable according to the angle by using the information on the angle correction of the memory 5, determines the remaining life of the lead-clad cable from the repulsion hardness after the correction by using the time elapsed after laying of the lead-clad cable and the information on the judgement of the life thereof and outputs the same to a printer 6 or liquid crystal display 7.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention measures the remaining life of lead-sheathed communication cables that have already been installed by measuring the repulsion hardness of lead-sheathed cables in a non-destructive and on-site manner. The present invention relates to a device that can be easily diagnosed while in operation.

[Prior art]

As a conventional device of this type, there is a cable coating deterioration diagnostic device (patent application ShotoO-3rl/J-). Similar to the present invention, this device uses the repulsion hardness of the material to be measured, This is used to diagnose the degree of deterioration of cable sheathing, but it usually targets outer sheaths made of organic materials and cannot be used for metal outer sheaths. There was a drawback that the process had to be carried out using established reference values.

In addition, conventionally, rebound hardness has been measured by applying a sensor device vertically to the material whose rebound hardness is to be measured, so depending on the part of the structure, the sensor device may have to be measured by tilting it from the vertical direction. Must be.

Repulsion hardness is measured by colliding the hardness measurement rigid body of this sensor device with the surface of the object to be measured, and finding it from the velocity ratio of the rigid body just before and after the collision, so it is not affected by gravitational acceleration. Ru. Therefore, even if materials of the same hardness are measured, depending on the part of the structure, the value of repulsion hardness obtained due to the influence of the tilt of the sensor device may differ from the value of the material itself of the object to be measured.

[Problem that the invention seeks to solve]

With conventional deterioration diagnosis equipment, the angle between the sensor device and the vertical direction at the time of measurement is measured by another means, and this is calculated and corrected by humans, so that the material of the object to be measured is horizontal and the sensor device is vertical. The method used was to change the value to the measured value. For this reason, with conventional devices, the inclination of the senna device during measurement must be measured by a separate means, and a human being must perform calculations using these measured values, which is a complicated procedure.

[Means for solving problems]

The voltage value, which is the analog output of the sensor device, is converted into a digital quantity by an A/D converter, and the measurement procedure program for deterioration diagnosis of lead-sheathed cable jacket, the calculation program for deterioration diagnosis, and constants prepared in advance are stored in the memory device. According to these programs, the arithmetic processing unit performs
Digital view of the rigid body used to measure the hardness of the sensor device The repulsive hardness of the lead-sheathed cable sheath, the object to be measured, can be determined from the speed changes immediately before and after the collision with the lead-sheathed cable sheath, which is the object to be measured. In addition to self-correcting the sensor device to the measured value in the vertical direction, the remaining life of the lead-sheathed cable, which is the object to be measured, is determined from the change in repulsion hardness of the lead-sheathed cable jacket, which is the object to be measured. , displays and outputs the results of the arithmetic processing unit on a display and printer.

0 operation] The present invention digitizes the output voltage from a sensor device for measuring repulsion hardness, performs angle correction according to a program installed in a memory device and an arithmetic processing device in advance, and then calculates the remaining lead-covered communication cable. 8. Automatically calculate lifespan without any manual effort and display/output the results 8 [Embodiment] FIG. 1 is a configuration diagram of a device in an embodiment of the present invention,
/ is a sensor device, λ is an amplifier, 3 is a /D converter, ≠ is an arithmetic processing unit, evening is a memory device, 6 is a printer,
7 is a liquid crystal display.The voltage generated in the sensor device/when measuring the repulsion hardness is amplified by the amplifier λ, and converted into a digital value by the A/D converter 3. The arithmetic processing unit is a memory device based on the digital conversion value of the A/D converter 3! The value of repulsion hardness is calculated according to the program stored in the program, and the remaining life is estimated from a plurality of values of repulsion hardness obtained by repeating the above series of steps. The values of repulsion hardness and remaining life obtained by the calculations of the calculation processing unit μ are output to the printer B or the liquid crystal display 7.

The configuration is displayed.

First, an example of a repulsion hardness meter sensor used in the present invention will be explained. FIG. 2 is a sectional view of a repulsion hardness meter sensor according to an embodiment of the present invention, where ri is a housing, IO is a rigid body, /l is a rigid body setting spring, /2 is a rigid body firing spring, and /3 is a release Button, /4 is coil, /! is a magnetic material, /B is a lead-sheathed cable.

When the rigid body io existing in the housing is pushed in from the coil /≠ to the release button /3 direction, the upper tip of the rigid body 10 is centered on the lower tip of the rigid body setting spring /I. At this time, the rigid body firing spring /2 is simultaneously contracted. In this state, when the lower part of the housing cylinder is pressed perpendicularly to the surface of the lead-sheathed cable 16 and the IJ IJ- button 13 is pressed, the release button /3 spreads the lower tip of the rigid body setting spring l/. The tip of the rigid body IO is a rigid body set spring l
Leaving the lower tip of /, the rigid body 10 is launched downward in FIG. 2 by the force of the rigid body launch spring 12. Rigid body i.

collides with the surface of the lead-sheathed cable l at a velocity v determined by the influence of the initial velocity Va and the imperial velocity at this time. The rigid body IO loses energy due to the collision with the surface of the lead-sheathed cable 16, and now rebounds upward in FIG. 2 at a speed v2. On the other hand, there is a magnetic body l! in the rigid body io! It has a built-in function.

Since the coil l≠ is wound on the outside of the okatsu housing,
Due to electromagnetic effects, voltages V, , V, proportional to the velocity V+, V2 of the rigid body io are generated in the coil.

FIG. 3 shows the voltage change over time of the coil l≠ in the embodiment of the present invention. Repulsion hardness value Hr.

is HL = I vz/v+ l x 1000
It is defined by equation (1). By the way, the sensor of the repulsion hardness meter has a structure as shown in Figure 2, so if the surface of the lead-sheathed cable/6 to be measured has an angle θ with respect to the horizontal direction, the casing of the sensor device Since the direction of the cylinder is not vertical, the influence of the gravitational acceleration g differs depending on θ, and as a result, the velocity V, , VtO value changes. Therefore, the value of I(L obtained by equation (1) is
A phenomenon occurs in which even if objects of the same hardness are measured, the hardness differs due to the difference in θ.

In the present invention, in order to correct the change in lL value (due to this angle θ), the arithmetic processing unit performs calculations based on the information (voltage) from the sensor, and the obtained Hz value is set to 0=O (when the sensor device is placed in the vertical direction). The value is adjusted to the value of This will be explained in detail below.

Figure ≠ shows the vl value (voltage) and angle θ using this sensor device.
This figure shows the measurement results. From this figure, voltage v1
and θ, V+ = 7. j O+0. /Icesθ
(2) There exists a relationship as shown in equation (2). Therefore, if the voltage v1 value is found when measuring the repulsion hardness, θ can be found as follows.

Figure 5 shows θ for a lead-sheathed cable with the same hardness as θ~/
Value 1 when repulsion hardness is measured by varying ♂0 (deg) (L and repulsion hardness when θ is 0 (deg)■I
The difference (ΔILL) from Lφ is taken to determine the relationship between ΔHL and the angle.

ΔHL=/rcas(θ-11g) + i I
It became clear that it is given by equation (a). From the above study results, 1. In the present invention, in order to correct the error in repulsion hardness due to θ, θ is first calculated using equation (2)′ (3)
Find the value of ΔHr using the formula HLφ= FIL−ΔHb (4
), the repulsion hardness is corrected to the value HLφ when the repulsion hardness is measured with the angle of the sensor device facing the vertical direction.

FIG. 6 shows the flow performed by the arithmetic processing unit to correct the influence of the angle θ as described above.Next, the measurement of the remaining life performed by the arithmetic processing unit ≠ will be explained. The lead-sheathed cable is a Pb-8o-Sb ternary alloy.Sn and Sb are added to improve strength.Pb-8n and L'b-8b are in equilibrium at room temperature. However, the region in which a single solid solution is formed is narrow, and in communications applications, the λ phase is stable.

However, since lead-sheathed cables are rapidly cooled from a molten state during manufacture, they are in a single-phase metastable state. Therefore, stress
When external factors, such as temperature, are applied to a lead-sheathed cable, the structure of the lead-sheath separates from a single-phase to a more stable two-phase structure. Figure 7 schematically shows the deteriorated metal structure.
is a metastable phase, /r is a stable phase, and l is a crack.8 When lead-sheathed cable is manufactured, it is a single phase with only a metastable phase /7, but when stress, temperature, etc. will separate. Since this stable phase it is closer to pure lead, its mechanical strength is lower than that of the metastable phase /7, and cracks grow only through the stable phase /r. On the other hand, the strength of the lead-sheathed cable is usually designed based on the mechanical properties of the metastable phase 17, so as the stable phase/g increases, the strength of the lead-sheathed cable becomes less than the design value. Therefore, 4m of lead-covered gold
When the texture changes and the stable phase it increases, cracks /7 occur in the stable phase /r.

FIG. 2 shows the relationship between the repulsion hardness 11Lφ of the lead-sheathed cable and the amount of stable phase it generated in the lead-sheathed structure. As shown in Fig. 2, as the amount of 1 g of stable phase increases, the rebound hardness tends to decrease.Using this relationship, the stable phase i generated in the lead-covered structure can be calculated. The amount of r can be quantified.

Figure 7 schematically shows the concept of lifespan diagnosis for lead-sheathed cables. The vertical axis of the figure shows the repulsion hardness ITLφ, and the horizontal axis shows the number of years that have passed. The hardness of lead-sheathed cables is determined by the alloy component ratio and manufacturing method, so in the case of communication lead-sheathed cables that have a fixed component ratio and the same manufacturing method, the hardness of the lead sheath immediately after manufacturing is a constant value III. ,, becomes. Due to the above-mentioned phenomenon, the repulsion hardness of the lead sheath decreases, and the manner in which it decreases depends on the slope determined by the environment in which the cable is installed, such as stress and temperature, and as shown in the seventh factor, it changes over the years. is given by an almost straight line. On the other hand, the stress that is applied to a lead-sheathed cable and causes cracks is determined by the installation conditions of the lead-sheathed cable, that is, the curvature of the cable. Therefore, the hardness l11B of the lead-sheathed cable when a crack occurs varies depending on the curvature of the cable. By the way, when installing a cable, a minimum curvature is determined due to problems in the strength of the cable itself or transmission characteristics, and the maximum stress applied to the cable can be determined from this minimum curvature. The hardness at which cracks occur in the lead-sheathed cable when this maximum stress is applied is represented by I]LB, and the number of years to reach this FILB is defined as the cable life.

Next, a method for diagnosing the lifespan of a cable will be explained below using FIG. If we measure the hardness I-1 of a lead-sheathed cable to be diagnosed y years after the cable was installed,
Assuming that the cable installation environment has been constant since the time of installation and will not change in the future, the remaining life LT can be calculated using the following equation (5).

LT = ((I(Lφ-HLB)X Y) / (H
l, I -11Lφ) Equation (5) As stated above, in the case of lead-sheathed communication cables, if the period during which they were laid (y years) and the value of repulsion hardness at that time (HLφ) are known, the remaining life ( LT) can be obtained. Note that Figures (a) and (b) show the maximum and minimum values of the measured values, respectively.

In equation (5), ■ILB is determined at the time when the maximum stress is applied, so the remaining life (LT) is determined on the safe side in all cases.

FIG. 10 shows the operational flow for diagnosing deterioration of the arithmetic processing unit in the embodiment of the present invention. In order to estimate the remaining life (LT) on the safe side, the diagnostic device of the present invention measures the repulsion hardness at multiple points, and calculates equation (5) using the minimum value among them, taking the safe side into consideration. There is.

The remaining life (LT) value obtained as a result of the calculation is
1 Displayed and output on the LCD screen.

〔Effect of the invention〕

As explained above, if you use the present invention, ■ Angle correction during repulsion hardness measurement will be performed using only your own data, and ■ The remaining life of the measured cable lead will be displayed just by measuring repulsion hardness. This method has the advantage that lifespan can be estimated more easily than the conventional method of diagnosing by manually reading the HP.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of the device in the embodiment of the present invention, Fig. 2 is a sectional view of the repulsion hardness meter sensor, Fig. 3 is a diagram showing the change in coil voltage over time in the embodiment of the present invention, and Fig. Figure 6 shows the relationship between Vl and θ, Figure 6 shows the relationship between ΔHL and θ, Figure 6 is the flow of angle correction, Figure 7 is a schematic diagram of deteriorated metal structure, Figure 2 shows repulsion. Figure 10 is a diagram showing the relationship between hardness and stable phase generation amount, Figure 1 is a schematic diagram showing the concept of life diagnosis of lead-sheathed cables, and Figure 10 is an operation flow of the arithmetic processing section. l: Sensor device, 2: Amplifier, 3: A/D converter, lA: Arithmetic processing unit, ! : Memory device, B: Printer, 7: Liquid crystal display, R: Housing, 10: Rigid body, //: Spring for rigid body set, /2: Spring for rigid body firing, /3: Release button, lIl, : Coil, / j°Magnetic material, /B: Lead-coated cable, /7: Metastable phase, /♂; Stable phase, /R: Crack. 1st figure 7 蓓 い し た し ま た ま さ σ さ ま ん の の １ に Ｇｕｎｄ Ｇ Ｇ Ｇ Ｇ Ｇ Ｉ ” 4 2 (Gt
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Claims (1)

[Claims] By causing a rigid body containing a magnetic material to collide with a lead-sheathed cable, and detecting changes in speed of the rigid body immediately before and after the collision with a sensor to determine the repulsion hardness of the lead-sheathed cable, The apparatus for diagnosing deterioration of the lead-sheathed cable includes means for digitizing the output of the sensor and inputting it to an arithmetic processing unit, and a memory that stores measurement angle correction information of the sensor and life-span judgment information of the lead-sheathed cable. From the apparatus and the velocity of the rigid body immediately before the collision with the lead-sheathed cable,
a function of calculating the angle that the motion direction of the rigid body makes with the vertical direction; a function of determining the repulsion stiffness of the lead-sheathed cable from the speed change immediately before and after the collision of the rigid body; and a function of calculating the repulsion stiffness of the lead-sheathed cable using the angle correction information. A function that corrects the repulsion hardness of the lead-sheathed cable according to the angle, the elapsed installation time of the lead-sheathed cable at the time of deterioration diagnosis measurement, and the life judgment information is used to calculate the repulsion of the lead-sheathed cable after the angle correction. A lead-sheathed cable deterioration diagnostic device comprising: an arithmetic processing unit having a function of determining the remaining life of the lead-sheathed cable from its hardness.