JPH09243781A - Carrying article monitoring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the operating safety of a device by providing the device with a detector drive arithmetic part for regulating the setting height of an upper detector by each of front and rear regulating maximum information values and a reserve signal. SOLUTION: An information partitioning function 11 divides the periodic information of the height dimension measured by height detectors 1, 2 into a plurality of sections in time series from a front part section to a rear part section as A→B, B→C, C→D, D→X. Each of front and rear information selecting functions 12, 13 selects the maximum information values in the front section and rear section, respectively, to set a front maximum information value and a rear maximum information value. The front and rear maximum information values are mutually compared by a maximum information value comparing function 14, and when the rear value is larger than the front value, a reserve signal is outputted. A detector drive arithmetic part 3 regulates the setting height of an upper detector 6 by both the maximum information values and the reserve signal. Therefore, the contact of the detector 6 with a carrying article 18 can be avoided, and the operating safety of a carrying article monitoring device can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transported article monitoring apparatus for confirming contamination by radioactive substances when carrying out scaffolding boards, pipes, etc. used in construction in a nuclear facility from a controlled area to a non-controlled area. .

[0002]

2. Description of the Related Art As shown in FIG. 9, a conventional article monitoring system for carrying out radiation measurement when carrying out an article to a non-controlled area is carried by loading a article 8 to be inspected, such as a scaffold plate or a pipe, on a compare 8. The measurement is performed while the conveyor 8 automatically conveys the monitor from the entrance to the exit.

On the monitor entrance side, for example, 15 light emitting side photoelectric switches 41 are arranged on the left side and 15 light receiving side photoelectric switches 42 are similarly arranged on the right side. For example, the height of the inspection object at that time is detected every second.

In the detection device, a fixed lower detector 7 is installed under the conveyor 8, and the upper detector 6 is kept on the conveyor 8 in a horizontal direction according to the height of the article 18 to be conveyed. It is moved up and down by the detector driving device 43 while being controlled by the device 46.

That is, when the conveyed article 18 reaches the intermediate position between the light emitting side photoelectric switch 41 and the light receiving side photoelectric switch 42 arranged at the entrance, the upper detector 6 detects the height of the conveyed article 18 measured at the monitor entrance. Is moving.

The height data of the conveyed article 18 is shown in FIG.
As shown in the flowchart explanatory diagram of step S71, in step 71, the data D1 to D10 read by the light emitting side photoelectric switch 41 and the light receiving side photoelectric switch 42 at the monitor entrance, for example, every 5 seconds are sequentially stored.

In step 72, for example, it is determined that 15 seconds have passed,
Further, in step 73, in order to use this data as the data for driving the detector, the data K1 to
Transferred as K10. Then, in step 74, it is determined, for example, after 5 seconds, and step 75 is activated. In step 75, for example, the data having the highest height among the data D1 to D10 is adopted as the data for driving the upper detector 6 every 5 seconds. This is because the upper detector 6 can be lowered only after the highest level has passed.

Then, in step 76, for example, it is determined that 40 seconds have passed, and in step 77, the data of which time has elapsed among the data K1 to K10 is cleared (erased).

[0009]

In the prior art, as shown in the detector position, the vertical drive of the detector is operated by one axis, so the detector surface is always horizontal,
If the conveyed article is inclined, the measuring distance between the conveyed article and the detector becomes large, which causes a problem that the measurement efficiency is lowered.

Further, since the vertical drive of the detector is started in the middle of the upper detector and the photoelectric switch on the light receiving side, when a conveyed article having a different height comes, the upper detector measures at that position. It stops and moves to the height of the next conveyed article. (For example, at present, it moves to the next height about 15 seconds before) Further, since the height reading of the photoelectric switch is, for example, every 5 seconds, it cannot be measured when the conveyed article has a protruding portion,
This protruding portion may collide with the detector.

According to the present invention, the timing for driving the detector up and down (appropriate time) is measured from the relationship between the height of the conveyed article and the distance between the detector and the photoelectric switch, and the measured distance between the detector and the conveyed article is safe. It is an object of the present invention to provide a conveyed article monitoring apparatus that minimizes the distance while keeping the distance.

[0012]

SUMMARY OF THE INVENTION A conveyed article monitoring apparatus according to the present invention comprises a moving conveyor for moving conveyed articles.
A pair of height detectors that are installed on both sides of the transfer conveyor to measure the height of the articles periodically, and a transfer position that is behind the height detector and is installed above the transfer conveyor at the rear position. An upper detector for inspecting the quality of the article, a lower detector for inspecting the quality of the conveyed article in combination with the upper detector installed at the rear of the moving conveyor at a position rearward of the height detector, The information division function that divides the periodic information of the height measured by the height detector into a plurality of divisions in time series from the front division to the rear division, and the time division was performed by the information division function. The front information selection function that selects the largest information value in the front section and makes it the maximum information value in the front section, and the largest information value in the rear section that is divided in time series by the information division function And the rear information selection function that sets the rear maximum information value, and the front The maximum information value comparison function that compares the large information value with the rear maximum information value and outputs a hold signal when the rear maximum information value is larger than the front maximum information value, and the front maximum information value and the rear maximum information value It is characterized by comprising a detector driving calculation unit for adjusting the set height of the upper detector by the hold signal.

According to another aspect of the present invention, there is provided a front article driving device for controlling the front portion of the upper detector to move up and down according to the maximum front information value, and a rear portion maximum information value and a hold signal for detecting the upper portion. And a rear drive device that controls the rear part of the container to move up and down.

Further, in the conveyed article monitoring apparatus according to the third aspect, the detector equivalent width determined by the upper detector and the lower detector is adjusted, and the center height and the inclination angle of the upper detector are calculated to obtain the upper portion. It is characterized by having a simulation calculation function of performing a simulated calculation of the distance between the detector and the conveyed article, and moving up and down the front part and the rear part of the upper detector so as to obtain a minimum clearance size exceeding a predetermined margin size. .

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the conveyed article monitoring apparatus of the present invention will be described. In FIG. 1, the moving conveyor 8 is a device that carries a conveyed article 18 to be inspected and moves the conveyed article 18 in the direction of arrow Y. The height detectors 1 and 2 are a pair of detectors which are installed on both the left and right sides of the moving conveyor 8 and measure the heights a, b, and c of the conveyed article 18 periodically (cyclically).

The upper detector 6 is a detector which is installed at the rear of the height detectors 1 and 2 in the moving position and above the moving conveyor 8 to inspect the quality of the conveyed article 18, The lower detector 7 is installed at the rear of the height detectors 1 and 2 in the moving position and further below the moving conveyor 8, and is combined with the upper detector 6 to inspect the quality of the conveyed article 18. It is a vessel.

The information division function 11 provides periodic information of height dimensions measured by the height detectors 1 and 2, for example, A to B and B.
To C, C to D, D to X, and the like, it is a function of dividing into a plurality of sections in time series from the front section to the rear section. Is a function of selecting the largest information value among the front divisions that have been divided into the maximum information values of the front portions, and the rear information selection function 13 is a rear division divided in time series by the information division function 11. The maximum information value comparison function 14 selects the largest information value from among the maximum information values, and the maximum information value comparison function 14 compares the maximum information value of the front portion with the maximum information value of the rear portion, and the maximum information value of the rear portion is the maximum information value of the rear portion. It is a function of outputting a hold signal when it is larger than the information value.

The detector driving arithmetic unit 3 is a device for adjusting the set height of the upper detector 6 by the front maximum information value, the rear maximum information value and the hold signal, and the internal function 3B is the detector driving arithmetic unit 3B. Shows part of the contents of.

The front drive unit 4 and the rear drive unit 5 are devices that characterize the conveyed article monitoring apparatus according to claim 2, and the front drive unit 4 is output from the detector drive calculation unit 3. Is a device that controls the front part of the upper detector 6 to move up and down as indicated by an arrow 4b by the detector drive signal 3a, and the rear drive device 5 uses the detector drive signal 3a output from the detector drive calculation unit 3 5b of the rear of the upper detector 6
It is a device for controlling the lifting drive as described above. The height positions of the front part and the rear part of the upper detector 6 are the detector position signal 5a.
Is input as feedback to the detector drive calculation unit 3. That is, the height of the conveyed article 18 is constantly and cyclically (periodically) measured by the detector driving calculation unit (3) that constantly monitors the height of the conveyed article 18, and the maximum and minimum heights in a certain period of time are calculated. Provide a data processing function. Further, a drive unit for moving the upper detector 6 up and down so as to match the shape of the conveyed article 18 is provided before and after the detector.

Next, an example of the function of the detector drive calculation unit 3 will be shown below.

(1) Reading height signals from height detectors 1 and 2 for measuring the height of the conveyed article 18 a. After the measurement is started in step 21 shown in FIG. 2, in step 22, the height signal is read every 100 ms. In step 23, the data for every 100 ms is
Monitor at sec intervals and use the maximum value during this period as data c. In step 24, the data every 1 sec is set to 6 s
Connect by ec to make one data d. In step 25, at 6 seconds before the detector, the data at 6 seconds at the tip is extracted as the data for driving the detector back and forth. (“D” part of the data shown in FIG. 1) e. At step 27, the data section is cyclically repeated along with the conveyed article 18 in the order of A → B → C → D → A (2) Output of detector driving signal a. In step 26, the height data is sequentially searched from the leading end of the 6 sec data, and the lowest data and the highest data are extracted. The lowest data at the front end is output as a drive signal for the rear part of the detector, and the highest data is output as a drive signal for the front part of the detector (step 27). C. There is height data that becomes lower by sequentially searching from the first height data in 6 sec data, and when the conveyed article is not coming out from the rear part of the detector, lowering the detector may cause collision at the rear part of the detector. Therefore, the previous height data is retained.

D. When high data or low data is repeated within 6 sec of data, driving is performed without inclination as in the conventional case.

FIGS. 3 and 4 show the operation of the conveyed article monitoring apparatus. When the conveyed article 18 mounted on the conveyor 8 enters from the monitor entrance, the height detectors 1 installed at two left and right positions. 2, the height is measured and the height of the upper detector 6 is adjusted. This situation is shown at times t _{0 to} t ₈ .

With the above-mentioned structure, the conventional structure shown in FIG.
As shown in FIG. 12 and FIG. 12, the measurement time and the measurement distance were large values of time T ₂ and distance L _2, respectively, but in the present embodiment, as shown in FIG. 5 and FIG.
By calculating the inclination of the conveyed article 18 by the detector drive calculation unit 3,
The measurement time and the measurement distance between the upper detector 6 and the conveyed article 18 become the time T ₁ and the distance L ₁ , respectively, and the optimum state can be maintained, and the measurement efficiency is improved by 2 to 4 times as compared with the conventional case.

Furthermore, since the height detectors 1 and 2 constantly measure the height of the conveyed article 18 cyclically to monitor the unevenness and the like, it is possible to avoid the collision with the upper detector 6. is there.

FIGS. 7 and 8 show another embodiment, in which the height and angle of the conveyed article 18 and the simulation (simulated calculation) are performed in front of the upper detector 6 to convey the upper article 6 and the upper detector 6. This is an example in which the position threshold of the article 18 is optimized.

That is, FIG. 7 shows the case where the cycle of the unevenness of the conveyed article 18 is larger than the radiation of the upper detector 6, and FIG. 8 shows the case where the cycle of the unevenness of the transported article 18 is smaller than the radiation of the upper detector 6. .

(1) Let h be the average height of the conveyed article 18, which is the equivalent width of the upper detector 6 (which is 1 to 2 times the detector width), and the height h (x) at each point. (2) For example, smoothing (smoothing operation) such as n-th order function approximation is performed, and the angle θ (x) is calculated from the inclination.

Θ (x) = dh (x) / dx (3) The detector driving calculation unit 3 causes the center height H of the detector to be H.
(X), the angle θ (x) is calculated, and it is confirmed whether or not the upper detector 6 and the conveyed article 18 are in contact with each other.

H (x) = h (x) + Q (4) From the above, the height and angle of the upper detector 6 at each position when the conveyed article 18 is at the measurement position can be determined. Since the required operation amount (movement amount) for each drive cycle of the upper detector 6 is obtained, it is confirmed whether or not the drive speed is sufficient, and the detector drive signal is output. When an operation exceeding the drive speed is required, the measurement is automatically stopped to avoid contact between the upper detector 6 and the conveyed article 18, and the measurement from there is switched to the manual measurement.

[0031]

According to the present invention, the operational safety of the conveyed article monitoring apparatus can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a conveyed article monitoring device showing an embodiment of the present invention.

FIG. 2 is a flowchart illustrating the operation of FIG. 1;

3 is an explanatory diagram showing a time-series positional relationship of FIG. 1. FIG.

FIG. 4 is an explanatory diagram showing a time-series positional relationship subsequent to FIG.

FIG. 5 is an explanatory diagram showing an operation time difference when the conveyed article is rectangular.

FIG. 6 is an explanatory diagram showing measurement intervals when the conveyed article is a slant.

FIG. 7 is an explanatory diagram showing a simulated height and a tilt angle of claim 3;

FIG. 8 is an explanatory diagram showing simulated heights and tilt angles when the detector equivalent width is changed.

FIG. 9 is a perspective view showing a conventional conveyed article monitoring device.

FIG. 10 is a flow chart explanatory view showing the operation of FIG.

FIG. 11 is an explanatory diagram showing an operation time difference when a conveyed article has a rectangular shape.

FIG. 12 is an explanatory diagram showing measurement intervals when the conveyed article is a slant.

[Explanation of symbols]

 1 Height Detector 2 Height Detector 3 Detector Driving Arithmetic Unit 4 Front Driving Device 5 Rear Driving Device 6 Upper Detector 7 Lower Detector 8 Moving Conveyor 11 Information Sorting Function 12 Front Information Selecting Function 13 Rear Information Selection function 14 Maximum information value comparison function 18 Conveyed goods

Claims (3)

[Claims] 1. A moving conveyor for carrying and moving a conveyed article, and a pair of height detectors installed on both sides of the moving conveyor for periodically measuring the height of the conveyed article, and a pair of these height detectors. An upper detector that is installed above the moving conveyor at a position rearward of the height detector and inspects the quality of the conveyed article, and a position rearward of the height detector for moving the moving article. A lower detector installed in the lower part of the conveyor for inspecting the quality of the conveyed article in combination with the upper detector, and cyclic information of the height dimension measured by the height detector from the front section to the rear section. Information division function that divides into multiple divisions in time series into divisions, and the maximum information value is selected by selecting the largest information value in the front division divided in time series by this information division function. Front information selection function to
A rear information selection function that selects the largest information value among the rear sections that are time-sequentially divided by the information division function as the rear maximum information value, and the front maximum information value and the rear maximum information value. A maximum information value comparison function that outputs a hold signal when the rear maximum information value is greater than the front maximum information value, and the front maximum information value, the rear maximum information value, and the hold signal. A transported article monitoring device, comprising: a detector driving calculation unit that adjusts the set height of the upper detector. 2. A front drive device for controlling the front part of the upper detector to drive up and down according to the front maximum information value, and a lift drive control for the rear part of the upper detector based on the rear maximum information value and the hold signal. The transported article monitoring device according to claim 1, further comprising: 3. A detector equivalent width determined by the upper detector and the lower detector is adjusted, and a center height and an inclination angle of the upper detector are calculated so that the upper detector and the conveyed article are separated from each other. 3. The method according to claim 1 and claim 2, further comprising a simulation calculation function of performing a pseudo calculation of a space and moving up and down a front portion and a rear portion of the upper detector so as to have a minimum space dimension that exceeds a predetermined marginal dimension. The conveyed article monitoring device described in 2.