JP3377264B2 - Monitoring equipment for electrical components - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring device for electric parts, and more particularly to a monitoring device for electric parts for monitoring deterioration of electric parts whose electric resistance changes due to deterioration.

[0002]

2. Description of the Related Art As an electric component of this type, for example, there is a filament which is provided in an electron beam welding machine and generates an electron beam, and the electron beam generated from the filament is applied to a work (workpiece) in a vacuum chamber. The work is welded by being irradiated. Such a filament is deteriorated by repeatedly generating an electron beam, and its electric resistance gradually increases.

Therefore, conventionally, an operator regularly checks the filament and replaces it with a new filament when the electric resistance thereof exceeds a predetermined threshold value.

[0004]

However, in the above-described conventional filament inspection method, it is not possible to predict and deal with the change in electric resistance due to the deterioration of the filament. In this case, since the deterioration cannot be predicted, it is not possible to avoid the welding failure of the work due to the change in the electric resistance.

An object of the present invention is to provide an electric component monitoring apparatus capable of predicting and coping with deterioration of electric components.

[0006]

[0007]

Monitoring apparatus for an electric component of the present invention, in order to solve the problems], in the monitoring device for the electric parts to monitor the first, degradation of electrical components made by the connection of the second part of the electric resistance varies due to deterioration Current detecting means for detecting a current flowing through the electric component, voltage detecting means for detecting a voltage applied to the electric component, and the electric component from the detected current of the current detecting means and the detected voltage of the voltage detecting means. Electric resistance calculating means for calculating the electric resistance of, the average value calculating means for calculating the average value of the electric resistance for each predetermined unit period calculated by the electric resistance calculating means, and the average calculated by the average value calculating means From the value history,
First predicting means for predicting future changes in the combined resistance of the second component and combined resistance of the first and second components predicted by the first predicting means reach a predetermined threshold value. Margin period calculating means for obtaining a first margin period up to, a first alarming means for issuing an alarm when the first margin period is within a predetermined warning period, and the first part A second predicting means for predicting a future change in the electric resistance of the second component from the history of the electric resistance obtained by the electric resistance calculating means each time when is replaced with a new one. Second margin period calculating means for obtaining a second margin period until the electric resistance of the second component predicted by the second predicting means reaches a predetermined threshold value; and the second margin period is predetermined. It is equipped with a third alarm means for issuing an alarm when it is within the warning period. And butterflies.

[0008]

The monitoring device for electric parts of the present invention detects the electric resistance of the electric part that changes due to deterioration, and then determines the electric resistance from the history of the average value of the electric resistance for each predetermined unit period. A margin period until reaching the threshold value is predicted, and an alarm is issued when the margin period falls within a predetermined warning period. Therefore, an alarm is issued by predicting the deterioration of the electric parts.

Further, for example, in an electron beam welding machine which irradiates an electron beam to a welding portion of a work piece from a filament connected to a high voltage cable, welding is performed by predicting deterioration of the filament or the high voltage cable. It is possible to avoid the deterioration of the quality.

[0010]

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

The following embodiment is an electron beam welding machine for electron beam welding a workpiece (workpiece) W,
It is an application example as a monitoring device of a filament for generating an electron beam. Therefore, first, the electron beam welding machine will be briefly described with reference to FIGS. 1, 2 and 3.

[About Electron Beam Welding Machine] In the electron beam welding machine of this example, while rotating the work W in the vacuum chamber R about the axis O ₁ in the vertical direction, the work deviated from the axis O ₁ Electron beam EB on top of W (see Figure 2)
By irradiating with, the upper part of the work W is continuously welded along the rotation direction. The vacuum chamber R is formed by a chamber chamber R ₁ and a column chamber R ₂ which are communicated with each other via an opening / closing valve 1. Inside the column chamber R ₂ , a filament 2 for generating an electron beam EB is provided. ing. Below the chamber R ₁ , there is provided a lid 3 which is attachable to and detachable from the lower opening. In the case of this example, a total of four lids 3 are arranged at equal intervals along the circumferential direction of the rotating body 4 that rotates about the vertical axis O _2. Accordingly, the lid body 3 is alternatively positioned below the chamber R ₁ . Each lid 3 is movable up and down with respect to the rotating body 4, and a rotary table 5 on which the work W can be placed is further provided so as to be rotatable around an axis line in the vertical direction.

The lid 3 located below the chamber R ₁ is pushed up by the cylinder 6 and rises to close the lower opening of the chamber R ₁ as shown in FIG. further,
The rotary table 5 provided on the lid 3 is rotated by the driving force of the AC motor 7. That is, when the cylinder 6 extends upward, the upper end of the drive shaft 8 is connected to the lower end of the rotary shaft 5A of the rotary table 5, and the drive shaft 8 is connected to the gears 10, 11, 12 in the gear box 9 and the spline. It is rotated by the motor 7 via the shaft 13. Gear 12
The spline shaft 13 and the spline shaft 13 are spline-fitted to each other, and the cylinder 6
The rotational force of the motor 7 is transmitted regardless of expansion and contraction of the motor.

After all, in the electron beam welding machine of this example, the rotary body 4 is rotated to sequentially position the four rotary tables 5 in the chamber R ₁ , so that the workpieces before welding to the rotary tables 5 can be obtained. The mounting of W, the welding of the work W, and the removal of the work W after the welding can be continuously performed.

The filament 2 (first component) is connected to a high voltage power supply 16 via a high voltage cable 15 (second component) as shown in FIG. Reference numeral 17 is a connection plug. The monitoring device according to the first embodiment of the present invention is a cable 15
Monitoring the deterioration of the filament 2 assuming that the electric resistance of the filament does not change, and the monitoring apparatus of the second embodiment of the present invention is
It is assumed that the electric resistance of the cable 15 changes due to the deterioration thereof, and the deterioration of the filament 2 is monitored in consideration of the deterioration of the cable 15. First, the monitoring device of the first embodiment will be described.

I "First Embodiment" In this embodiment, the deterioration of the filament 2 is monitored on the assumption that the electric resistance of the cable 15 does not change.

In the connection circuit between the cable 15 and the power supply 16, as shown in FIG. 3, a current detector (current detecting means) 2 is provided.
1 and a voltage detector (voltage detecting means) 22 are connected, and their detection current I and detection voltage V are amplified by an amplifier and input to the electric resistance calculating means 23 (see FIG. 4). This calculation means 23 calculates the electric resistance R of the filament 2 from R = V / I. Further, in the monitoring device of this example, the average value calculating means 24, the predicting means (first predicting means) 25, and the margin period calculating means (first margin period calculating means) 26 that function based on the electric resistance R thereof. , First and second alarm means 27, 28, and display means 29 are provided. These functions will be described later together with the operation.

Next, the operation of the monitoring apparatus of this embodiment will be described with reference to the flow charts shown in FIGS.

(Monitoring Operation) First, the detectors 21 and 22 sample the current I and the voltage V, for example, every 100 msec (step S1,
S2), the electric resistance calculation means 23 calculates the detection resistance R (= E / I) based on the detected values I and V (step S3). Then, when the detected resistance R exceeds a predetermined comparison reference value R _MAX , an abnormality alarm is issued (steps S4, S5, S6). Such an alarm function is the second
The alarm unit 28A (see FIG. 4) of the alarm means 28 of
Played by displaying the warning contents on the display unit 29A such as a CRT in the display unit 29 (see FIG. 4), also the comparison reference value _{R MAX} of setting function threshold setting unit 28B
(See FIG. 4). The comparison reference value R
_MAX is a value (see FIG. 7) when the deterioration of the filament 2 progresses to such an extent that it interferes with the generation of the electron beam EB, and when the detection resistance R exceeds this reference value R _MAX , the filament 2 is determined to be abnormal. Next
In addition, we anticipate the progress of deterioration of filament 2 in the future.
The following (data processing of the detection resistor R) is performed as the processing for determining .

(Data Processing of Detecting Resistance R) First, in order to calculate the average value of the detecting resistance R hourly, daily, and monthly, the average value calculating means 24 is calculated when these elapsed times coincide. Performs the following arithmetic processing.

That is, when it coincides with the elapsed time every hour, the average value (R-H) of the detection resistance R during the welding work carried out within the past hour is calculated in steps S7, S8 and S9. Then, as shown in FIG.
The data of the "time change graph" (time change graph in units of time) G ₁ displayed on the display unit 29A is updated. The horizontal axis of the graph G ₁ is the date and time, and the vertical axis is the average value per hour (R-
H). A graph G _{1 in} FIG. 9 is a change graph when the electron beam welding machine repeats a 2-hour pause and a 4-hour continuous operation, and for example, an electron beam is obtained after 1 hour has passed from 12:00 on the 31st. The welder operates continuously for 4 hours, then rests for 2 hours and then again for 4 hours. The upper limit in the graph G ₁ indicates the value of R _MAX .

Next, when it coincides with the elapsed time for each day,
In steps S10, S11 and S12, the average value (RD) obtained by averaging the average values (RH) for the past one day is calculated and displayed on the display unit 29A of the display unit 29 as shown in FIG. The data of “day-time change graph” (day-by-day time change graph) G ₂ is updated. The horizontal axis is month of chart G _2, the vertical axis represents the average value for each day (R-D). Figure 9
The middle graph G ₂ is a change graph when the electron beam welding machine is operated on weekdays and rested on Saturdays and Sundays, and the operation is repeated on two days on weekdays. For example, June 7th and 8th It will rest for two days and then run for five days. Further, the upper limit in the graph G ₂ indicates the value of R _MAX .

Next, when it coincides with the elapsed time every month, in steps S13, S14 and S15, the past 1
Average value (RM) obtained by averaging average values (RD) for months
Is calculated, and as shown in FIG. 11, the display section of the display means 29 is displayed.
Is displayed on 29A - (aging graph monthly) "month aging graph" updates the data in the G _3. Graph G
The horizontal axis of ₃ is the year and month, and the vertical axis is the average value for each month (RM)
Is. Moreover, the upper limit in the graph G ₃ indicates the value of R _MAX .

Further, when it coincides with the elapsed time for each day, future changes in the average value (RD) for each day are predicted (see FIG. 6).

That is, the average value (RD) of the latest day and the average value (RD) of 30 days ago are read as A and B, respectively (steps S17 and S18), and the alarm allowable upper limit value C, which will be described later, is set. The number of warning days (warning period) D is read (steps S19 and S20). Then, the prediction means 2
5 (see FIG. 4) calculates the average change amount Z per day by the following equation (1) (step S21).

[0026]

[Equation 1]

Further, based on the assumption that the average change amount Z will continue in the future, the future average value (R-
The simple arrival days (margin period) E until D) reaches the upper limit value C is calculated by the following equation (2) (step S22).
The setting function of the upper limit value C is performed by the threshold value setting unit 26B.
(See FIG. 4).

[0028]

[Equation 2]

For example, at the latest date a in FIG. 8, the average value (RD) of the latest date a is (A-a), and the average value of the day 29 days before that (a-29). (RD) to (B
As -a), the simple arrival days (E-a) from the above equations (1) and (2) to the upper limit value C are predicted. The latest day b
At the time point of, the average value (RD) of the latest day b is (A-
b), and the average value (RD) of the day (b-29) 29 days before that is defined as (Bb), and the above equations (1) and (2)
To the upper limit value C, the simple arrival days (E-b) will be predicted. By the way, as shown in FIG. 8, the average value (R-
The increase in D) means that the filament 2 has deteriorated. Therefore, obtaining the simple arrival days E predicts the number of days until the deterioration of the filament 2 progresses to an extent corresponding to the upper limit value C.

Thereafter, if the number E of simple arrival days is within the number D of warning days, an alarm is issued to report the deterioration of the filament 2 (steps S23 and S24). As described above, the warning function when the simple arrival days E reaches the warning days D is displayed on the display unit 29A of the display unit 29 by the warning unit 27A (see FIG. 4) of the first warning unit 27, for example. The display is fulfilled, and the function of setting the number of warning days D is fulfilled by the threshold value setting unit 27B (see FIG. 4). Then, the data of the deterioration prediction graph G ₄ described later is updated (step S25).

The display means 29 will now be described.

The display means 29 is a display unit 2 such as a CRT.
9A, and the display content is displayed by the display content switching unit 29.
It can be switched by B. The display screen includes a filament resistance monitoring screen that displays four graphs as shown in FIG. 9, an enlarged screen that individually displays the four graphs, and a filament resistance deterioration prediction screen as shown in FIG. And the threshold (R
_MAX ) setting screen. The graph G _{0 in} FIG. 9 is for sequentially displaying and monitoring the change in the detection resistance R. Further, the screen of FIG. 10 includes a graph G ₄ showing the history of the average value (RD) as shown in FIG. 8, the alarm output setting date as the warning days D, its change operation screen, and the simple arrival days E. Is displayed.

By the way, if the electric resistance of the cable 15 changes due to deterioration, the monitoring apparatus of this embodiment monitors the change in the combined resistance of the cable 15 and the filament 2.

That is, the electric resistance of the cable 15 is shown in FIG.
When it changes like R ₂ in 1 and gradually increases, the combined resistance of the cable 15 and the filament 2 becomes R in FIG. 11, and the combined resistance R is the upper limit value C (for example, R 2
_When the number of days to reach _MAX ) falls within the number of warning days D, a deterioration warning is issued. By replacing the filament 2 with a new one each time the alarm is issued, problems such as poor welding of the work W due to an increase in the combined resistance R can be avoided. Figure 11
The times t ₀ , t ₁ , t ₂ ... Are the replacement times of the filament 2. In the second embodiment described below, the change in the combined resistance of the cable 15 and the filament 2 as well as the change in the electrical resistance of the cable 15 are monitored.

II "Second Embodiment" In this embodiment, assuming that the electric resistance of the cable 15 also changes due to deterioration, the cable 15 and the filament 2
Monitor for deterioration.

Therefore, in the present embodiment, the second predicting means 31, the second margin period calculating means 32, and the third alarm means 33 of FIG. 12 are added to the configuration of FIG. 4 of the above-described embodiment. The deterioration of the cable 15 is also monitored. These means 31,3
2 and 33 function based on the electric resistance R obtained by the electric resistance calculating means 23 of FIG. Those functions will be described later together with the operation. The electric resistance of the cable 15 changes as R ₂ in FIG. 11, the combined resistance R of the cable 15 and the filament 2 is assumed to vary as shown in FIG. 11.

In the case of the present embodiment, the change in the combined resistance of the cable 15 and the filament 2 is monitored and the change in the resistance R ₂ of the cable 15 is also monitored as in the case of FIG. 11 described above. The monitoring operation of the resistor R ₂ will be described with reference to FIGS. 13 and 14.

First, the replacement times t ₀ , t of the filament 2
_For each ₁ , t ₂ ... (See FIG. 14), the electric resistance calculating means 23
Read the resistance R (R-0, R-1, R-2, ...; hereinafter referred to as "replacement resistance R"), the current replacement resistance R is A ', and the previous replacement resistance R is B ′ (Steps S31, S32, S33). Then, the number of days F elapsed between the previous replacement date and the current replacement date of the filament 2 is calculated (step S34), and further, an alarm allowable upper limit value C'to be described later is read (step S35). Then, the second predicting means 31 (see FIG. 12) obtains the average change amount Z ′ of the replacement resistance R during the elapsed days F by the following equation (3) (step S36).

[0039]

[Equation 3]

Further, based on the assumption that the average change amount Z'will continue in the future, the replacement time resistance R is set to the upper limit value by the allowance period operation unit 32A (see FIG. 12) of the second allowance period operation means 32. The simple arrival days (margin period) E ′ until reaching C ′ is obtained by the following equation (4) (step S3
7). The function of setting the upper limit value C'is performed by the threshold value setting unit 32 (see FIG. 12).

[0041]

[Equation 4]

As described above, the determination of the simple arrival days E'is to predict the number of days until the deterioration of the cable 15 reaches the upper limit C '. E ′ in FIG. 14 is the number of simple arrival days obtained at the time t ₄ of exchanging the filament 2.

By the way, when the filament 2 is replaced, it is assumed that the filament 2 is replaced with a new one, and the electric resistance of the new filament 2 is R ₀ in FIG. Therefore, obtaining the simple arrival days E ′ is to predict the number of days until the deterioration of the cable 15 progresses to such an extent that the resistance R _{2 of the} cable 15 becomes C ₂ (= C′−R ₀ ). Become. Of course, the resistance R ₂ (R _{2 of} the cable 15 obtained by subtracting the resistance R ₀ from the replacement resistances R-0, R-1, ...
-0, R ₂ -1, ... from), it can also be determined simply reach days E '.

On the other hand, when it is not the time to replace the filament 2, the number of days G elapsed from the latest replacement day of the filament 2 is calculated at the time of each day (steps S38, S3).
9) Further, the number of warning days (warning period) D'which will be described later is read (step S40). Then, if the number of days (E'-G) obtained by subtracting the elapsed days G from the simple arrival days E'obtained at the latest replacement of the filament 2 is within the warning days D ', an alarm is issued to report the deterioration of the cable 15 (step S
41, S42). Such an alarm function is achieved by the alarm unit 33A (see FIG. 4) of the third alarm unit 33 displaying the alarm content on the display unit 29A of the display unit 29, for example, and the setting of the warning days D '. The function is the threshold setting unit 3
3B (see FIG. 12) will be fulfilled. Then, by replacing the cable 15 with a new one at the time t ₁ ′ (see FIG. 14) when such an alarm is issued, until the combined resistance R of the filament 2 and the cable 15 reaches the upper limit value C. As a result, the number of days of arrival of the filament 2 is increased, and as a result, the replacement cycle of the filament 2 can be reduced.

The display means 29 displays the same monitoring screen as that shown in FIGS. 9 and 10 for the cable 15.

[0046]

As described above, the monitoring apparatus for electric parts of the present invention detects the electric resistance of an electric part that changes due to deterioration, and then records the average value of the electric resistance for each predetermined unit period. Therefore, it is configured such that a margin period until the electric resistance reaches a predetermined threshold value is predicted, and an alarm is issued when the margin period falls within a predetermined warning period. It can predict and give an alarm.

Therefore, for example, in an electron beam welding machine for irradiating a welding site of a work piece with an electron beam from a filament connected to a high voltage cable, welding is performed by predicting deterioration of the filament or the high voltage cable. It is possible to avoid the deterioration of quality.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a work rotation drive system of an electron beam welding machine provided with a monitoring device of the present invention.

FIG. 2 is a schematic configuration diagram of a vacuum chamber in the electron beam welding machine shown in FIG.

FIG. 3 is a current-carrying circuit diagram of the filament shown in FIG.

FIG. 4 is a block diagram showing a first embodiment of the present invention.

FIG. 5 is a flow chart for explaining the operation of the first exemplary embodiment of the present invention.

FIG. 6 is a flowchart for explaining the operation of the first exemplary embodiment of the present invention.

7 is an explanatory diagram of a change in resistance value of the filament shown in FIG.

FIG. 8 is an explanatory diagram of operations of a prediction unit and a margin period calculation unit shown in FIG.

9 is a front view of a display screen for explaining an example of display contents on the display unit shown in FIG. 4. FIG.

10 is a front view of a display screen for explaining another example of the display contents on the display unit shown in FIG.

FIG. 11 is an explanatory diagram of a resistance value change when the resistances of the high voltage cable and the filament are both changed in the first embodiment of the present invention.

FIG. 12 is a block diagram showing a main part of a second embodiment of the present invention.

FIG. 13 is a flow chart for explaining the operation of the main part of the second embodiment of the present invention.

FIG. 14 is an explanatory diagram of a high voltage cable and a change in filament resistance value according to the second embodiment of the present invention.

[Explanation of symbols]

R vacuum chamber W work (workpiece) EB electron beam 2 filament 15 High voltage cable 21 Current detector (current detection means) 22 Voltage detector (voltage detection means) 23 Electric resistance calculation means 24 Mean value calculation means 25 Prediction Means (First Prediction Means) 26 Margin period calculation means (first margin period calculation means) 27 First warning means 28 Second alarm means 29 Display means 31 Second Prediction Means 32 Second margin period calculating means 33 Third warning means

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyoshi Nakagawa 1 at 700 Kamoda, Imaizumi, Fuji City, Shizuoka Prefecture JATCO Ltd. (56) References JP-A-4-125473 (JP, A) JP-A-3- 202787 (JP, A) JP-A-5-119085 (JP, A) Actual development Sho 62-126361 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01R 27/08 G01R 31 / 00 G01R 31/24

Claims (5)

(57) [Claims] 1. An electric component monitoring device for monitoring deterioration of an electric component, which is formed by connecting first and second components whose electric resistance changes due to deterioration, and a current detecting means for detecting a current flowing through the electric component. A voltage detection unit that detects a voltage applied to the electric component; an electric resistance calculation unit that calculates an electric resistance of the electric component from a detection current of the current detection unit and a detection voltage of the voltage detection unit; Average value calculating means for obtaining an average value of electric resistance for each predetermined unit period obtained by the resistance calculating means, and synthesis of the first and second parts from the history of the average values obtained by the average value calculating means. A first predicting means for predicting a future change in resistance, and a first margin until the combined resistance of the first and second parts predicted by the first predicting means reaches a predetermined threshold value. First margin period calculating means for obtaining a margin period, first alarm means for issuing an alarm when the first margin period falls within a predetermined warning period, and the first part is new. A second predicting unit that predicts a future change in the electric resistance of the second component from the history of the electric resistance obtained by the electric resistance calculating unit every time the unit is replaced, and the second predicting unit. Second margin period calculating means for obtaining a second margin period until the predicted electric resistance of the second component reaches a predetermined threshold value, and the second margin period falls within a predetermined warning period. A monitoring device for an electric component, comprising: a third alarming means for issuing an alarm when the alarm occurs. 2. The first predicting means, assuming that the degree of change between the past average value and the latest average value before the predetermined period obtained by the average value calculating means will continue in the future. The second predicting means predicts a future change in the combined resistance of the first and second parts, and the second predicting means calculates the electric resistance calculated by the electric resistance calculating means every time the first part is replaced. The electric component monitoring device according to claim 1 , wherein the resistance is changed at a constant rate to predict future changes in the electric resistance of the second component. 3. A according to claim 1 or 2, characterized in that the electrical resistor on which electrical resistance computing means has operation with a second alarm means for issuing an alarm when it exceeds a predetermined threshold Monitoring equipment for electrical parts. 4. A display for displaying the calculation results of the electric resistance calculation means, the average value calculation means, the first and second margin period calculation means, and the prediction results of the first and second prediction means. 3. The method according to claim 1 , further comprising means.
Is a monitoring device for electric parts as described in 3 . 5. The first component is a filament provided in an electron beam welding machine to generate an electron beam,
The device for monitoring electrical components according to claim 1, 2, 3 or 4 , wherein the second component is a high voltage cable.