JPH02168134A - Inspecting apparatus for leakage of vessel - Google Patents

Abstract

PURPOSE:To improve the efficiency of a leakage inspecting operation by juxtaposing a plurality of gas detecting sensors, by making a vessel for inspection approach the gas inspecting sensors and by rotating it relatively. CONSTITUTION:A vessel 2 for inspection is conveyed by a belt conveyor 1 and put on a rotating device 3 and a gas to be detected is filled up in the vessel by a filling device 4. Then, a sensor fitting device 6 whereon a plurality of gas detecting sensors 5 are juxtaposed is moved in reciprocation by a moving device 12. An angle of relative rotation of the vessel 2 to the sensors 5 is detected by a relative rotation angle detecting means 7. Based on the results of detection by the sensors 5 ad the means 7, the position of leakage of gas is discriminated in a discriminating means 8 and the result of discrimination is displayed in a display means 9. In this way, the efficiency of a leakage inspecting operation can be improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention detects whether or not the gas to be detected has leaked from inside the container to be inspected, in which the gas to be detected is sealed under pressure. The present invention relates to a container leakage inspection device equipped with a gas detection sensor for detecting leakage.

[Conventional technology]

Conventionally, as shown in FIG. 5, the above-mentioned leakage testing device is provided with a sealed chamber (20) for accommodating the container (2), and has a flow path (R3) for taking out gas in the sealed chamber (20). A gas detection sensor (5) was interposed (for example, in
-56831).

[Problem to be solved by the invention]

However, not only is it time-consuming to take the container (2) in and out of the sealed chamber (20), but even if the gas to be detected leaks from the container (2), the air in the space inside the sealed chamber (20) This has the drawback that the leaked gas to be detected is diluted and the sensitivity of the gas detection sensor (5) is reduced.

An object of the present invention is to enable a container to be inspected for leakage with high sensitivity and with less effort.

[Means for Solving the Problems] A characteristic configuration of the container leakage testing device of the present invention is that a rotation device for rotating the container relative to the gas detection sensor around a uniaxial center is provided, and a plurality of the gas detection sensors are connected to each other. They are arranged in close proximity to the container and parallel to each other in the direction along the uniaxial axis, and have the following effects.

[For production]

In other words, even in an open space, the containers can be rotated relative to the gas detection sensor around one axis using a rotating device, without having to house the containers in a closed chamber. The plurality of gas detection sensors can perform leakage detection over almost the entire circumferential surface of the container, and by placing the plurality of gas detection sensors close to the container, even if the gas to be detected leaks from the container, The gas to be detected can be quickly detected in a highly concentrated state without being diluted by the surrounding air.

〔Effect of the invention〕

Therefore, it is possible to perform leakage inspection of containers in a short time and with high precision while reducing the effort required for detection, and to reliably confirm, for example, the presence of small holes or pinholes in the container or the presence or absence of defects in welded parts. As a result, leak test work efficiency and leak test performance can be improved.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, a container (2) to be inspected, such as a drum can or a bale can, is placed in the middle of a conveyance route where the container (2) to be inspected is conveyed by a belt conveyor (1) or the like. 3! A filling device (4) is provided with a rotating device (3) that rotates around the vertical axis (P) and pressurizes and seals the gas to be detected in the container (2).
is provided, and a plurality of gas detection sensors (5) for detecting whether or not gas to be detected has leaked from inside the container (2) are placed close to the container (2), and the shaft center (P ) are arranged in parallel at equal intervals in the direction along the axis (P), and attached to the sensor mounting device (6), and all the gas detection sensors (5) are mounted along the axis (P) via the sensor mounting device (6). A moving device (12) for reciprocating the gas detection sensor (5) is provided.
means (7) for detecting the relative rotation angle of the container (2) with respect to the container (2);
is provided, and the detection result from the relative rotation angle detection means (7),
Means (8) is provided for determining the leakage position of the gas to be detected based on the detection results from the respective gas detection sensors (5), and based on the determination results from the determination means (8), the container (
A display means (9) for displaying the presence or absence of gas leakage and the location of the leakage in step 2) is provided to constitute a container leakage inspection device as a whole.

An example will be described in which easy-to-handle, low-toxicity, and inexpensive alcohol vapor is used as the gas to be detected, and a high-W alcohol sensor is used as the gas detection sensor.

As shown in FIG. 2, the filling device (4) includes a first pipe (4) connected to the alcohol supply path (R1).
^) and the second pipe (4) connected to the air supply path (R2).
B) and an exhaust pipe (4C) for discharging the gas in the container (2).
The first,
Second pipe (4A), (4B) and exhaust pipe (4C)
With one end inserted into the container (2) through the opening (2A) formed in the container (2), a plug ( 10) is provided.

Then, to fill the container (2) with alcohol vapor using the filling device (4), close the on-off valve connected to the exhaust pipe (4C) and let air into the container from the second pipe (4B). (2) While supplying pressure inside the first pipe (4^)
By supplying alcohol through the pipe, the alcohol is vaporized while being sprayed from the lower end of the first pipe (4A), and the inside of the container (2) is heated to an internal pressure of 1 kg'/c+J, alcohol gas concentration, and lower explosive limit concentration. Set to 3.5vo1% or less.

Next, after the leakage test of the container (2), the on-off valve (ν) is opened and air is supplied into the container (2) from the second pipe (4B) to release the alcohol gas in the container (2). Discharge.

The gas detection sensor (5) is a sensor for alcohol detection, and the reciprocating distance of the gas detection sensor (5) by the sensor mounting device (6) is such that gas detection sensors (5) are arranged in parallel every 5c11, for example. In some cases, if the distance is set to 5 cm, almost the entire circumferential surface of the container (2) can be inspected.

The sensor mounting device (6) is equipped with a gas detection sensor (5) that covers both sides of the gas detection sensor (5) close to the container (2), as shown in FIG. A flexible guard (11) is provided which leads well to the gas detection sensor (5).

[Another example]

The filling device (4) gasifies alcohol in advance,
It may be filled into the container (2).

In addition to alcohol vapor, the gas to be detected may be vapor such as ketone or ether, or may be another gas. Therefore, the gas detection sensor (5) can detect the gas to be detected. It is fine as long as it is something.

The gas detection sensors (5) may be arranged in parallel at equal intervals in the direction along the axis (P), or may be arranged in parallel without any interval. It is not necessary to move the gas detection sensor (5) back and forth in the installation direction.

When detecting only the presence or absence of leakage without detecting the leakage position of the container (2), the relative rotation angle detection means (7)
It is not necessary to provide this in particular.

The display means (9) may be a lamp that lights up or an alarm that issues an alarm when a gas leak is detected, or a device that marks the leakage location, or a device that marks the leakage point on the next conveyor after inspection. It may also be a device that excludes non-defective products.

When inspecting a welded part or a particularly leak-prone part of the container (2), when the gas detection sensor (5) is close to the weld part or a particularly leak-prone part,
) is provided with a rotation control means that controls the rotation device (3) so as to stop the rotation device (3) for a set time, and the gas detection sensor (5) located at the welded part or a particularly leak-prone area is moved back and forth for more precise detection. It may be configured to allow leakage testing.

Moreover, instead of rotating the container (2) using the rotating device (3), the gas detection sensor (5) is rotated around the axis (P) while the container (2) is kept stationary. (or, furthermore, both the container (2) and the gas detection sensor (5) may be relatively rotated.

In the example shown, one sensor mounting device (6) to which a gas detection sensor (5) is mounted is used, but as shown in FIG. By providing the sensor mounting devices (6) and (6) together, the relative rotation angle can be reduced to 1/2, and the inspection time can be shortened.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the container leakage testing device according to the present invention, in which FIG. 1 is an overall schematic side view showing a partial cutout, FIG. 2 is a longitudinal sectional view of the filling device, and FIG. 3 is a cross-sectional view of the main part. A plan view, FIG. 4 is a cross-sectional plan view of another embodiment, and FIG. 5 is a schematic cross-sectional view of a conventional example. (2)... Container, (3)... Rotating device, (5)... Gas detection sensor, (7)...
... Relative rotation angle detection means, (8) ... Discrimination means, (P) ... Axis center.

Claims (1)

[Claims] 1. A container for inspection (2) in which a gas to be detected is pressurized and sealed inside.
), the container leakage inspection device is equipped with a gas detection sensor (5) for detecting whether a gas to be detected has leaked from inside the container (2), A rotation device (3) that rotates relative to the gas detection sensor (5) around a single axis (P) is provided, and a plurality of the gas detection sensors (5) are brought close to the container (2). , and container leakage testing devices arranged in parallel over almost the entire width in the direction along the uniaxial core (P). 2. Claim 1, wherein a plurality of the gas detection sensors (5) are arranged at equal intervals in the direction in which they are arranged side by side, and a moving device is provided for reciprocating the gas detection sensors (5) in the direction in which they are arranged in parallel.
Leakage testing device for the containers described. 3. The container (2) for the gas detection sensor (5)
A means (7) for detecting a relative rotation angle of the gas is provided, and a leak position of the gas to be detected is determined based on a detection result from the relative rotation angle detection means (7) and a detection result from the gas detection sensor (5). Claim 1 or 2 which is provided with a means for determining (8)
Leakage testing device for the containers described.