JPH0648373Y2 - Container leakage inspection device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a gas detection sensor for detecting whether or not a gas to be detected leaks from the inside of a container to be inspected in which the gas to be detected is pressurized and sealed. The present invention relates to a leak inspection device for a provided container.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, the above-mentioned leak inspection apparatus is provided with a closed chamber 20 for accommodating the container 2, and the gas detection sensor is provided in a flow path R ₃ for taking out gas from the closed chamber 20. 5 is interposed (for example, JP-A-62-56831).

[0003]

However, it takes time to put the container 2 in and out of the closed chamber 20, and even if the gas to be detected leaks from the container 2, it remains in the space inside the closed chamber 20. There is a drawback that the gas to be detected leaked by the air is diluted and the sensitivity of the gas detection sensor 5 is lowered. Also, if the detected gas is detected
However, it is impossible to know the leaked position of the detected gas.
did not come. An object of the present invention is to make it possible to inspect a container for leaks with a small amount of labor and with high sensitivity, and to detect a detected gas.
The point is to accurately determine the leakage position of the gas .

[0004]

A characteristic configuration of a container leakage inspection device according to the present invention is that a plurality of gas detection sensors are provided in front of each other.
In the state of being close to the container and along the uniaxial core
It is said that they are installed side by side at equal intervals over almost the entire width of the direction.
Then, the gas detection sensor is reciprocated in the parallel direction.
A moving device for controlling the gas detection sensor.
Is provided with means for detecting the relative rotation angle of the
The detection result from the detection means and the detection result from the gas detection sensor
Means for determining the leak position of the gas to be detected based on the output result
Is installed on both sides of the gas detection sensors.
A pair of guards that form side walls along the direction in which the output sensors are juxtaposed.
It has the following features and effects.
On the street.

[0005]

That is, even if the container is not housed in the closed chamber, the rotating device rotates the container relative to the gas detection sensor about the uniaxial center even in the open space, so that almost all of the direction along the uniaxial core is reduced. A plurality of gas detection sensors arranged side by side along the width can detect leaks over almost the entire peripheral surface of the container, and moreover, a plurality of gas detection sensors are provided on both sides of the side wall along the arrangement direction of the gas detection sensors.
With a pair of guard members forming
If they come in contact with each other, even if the gas to be detected leaks from the container,
The guard member separates ambient air from the gas to be detected.
While separating, detect the gas to be detected from the container
Since it is led to the sensor, the gas to be detected is the ambient air.
Detected by the gas detection sensor without being diluted by
As a result, the gas to be detected can be rapidly detected in a high concentration state. In addition, the gas detection sensor has a uniaxial core in the detection unit.
They are arranged at equal intervals along almost the entire width along the line.
At the same time, the gas detector is reciprocally moved in the parallel installation direction.
By providing a moving device to move the container,
Since it is possible to inspect almost the entire surface,
Leak inspection can be done in time and with high accuracy.
It Furthermore, from the relative rotation angle detection means and its detection results
Since there is a means to determine the leak position, the gas in the container
It is possible to know the leak position quickly and accurately. Incidentally, before
If the guard member is flexible, put the guard member in front.
Between the container and the guard member in close contact with the container.
Since a closed space can be formed with, the gas to be detected is
It becomes difficult for it to be diluted by the surrounding air, and
Even if the container is not circular, the guard member
High detection because it is easy to keep the closed space following the instrument
Easy to maintain performance. Also, install the gas detection sensor around the axis.
If it is installed in multiple places (for example, 2 places) in parallel,
Even if the relative rotation angle with the gas detector is reduced (1/2
Even if you can check the leak of the whole container, inspection time
Can be shortened (to half).

[0006]

[Effects of the Invention] Therefore, the leakage inspection of the container can be performed with high accuracy in a short time while reducing the labor for detection, and for example, the existence of small holes or pinholes in the container and the presence / absence of defects in the welded portion The position can be surely confirmed, and as a result, the leakage inspection work efficiency and the leakage inspection performance can be improved.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. As shown in FIG. 1, for example, a rotating device 3 for placing the container 2 and rotating it about a vertical axis P in the middle of a transport path for transporting a container 2 to be inspected such as a drum can or a pail can by a belt conveyor 1 or the like. The container 2 is provided with a filling device 4 for pressurizing and sealing the gas to be detected, and a plurality of gas detection sensors 5 for detecting whether or not the gas to be detected leaks from the container 2 are provided in the container 2. In the state of being close to each other, and the axis P
A moving device 12 that is installed in parallel to the sensor mounting device 6 at substantially equal intervals over substantially the entire width in the direction along which the gas detection sensor 5 is reciprocally moved along the axis P through the sensor mounting device 6 is provided. A means 7 for detecting the relative rotation angle of the container 2 with respect to the gas detection sensor 5 is provided, and the detected gas leaks based on the detection result from the relative rotation angle detection means 7 and the detection result from each gas detection sensor 5. A unit 8 for discriminating the position is provided, and a display unit 9 for displaying the presence / absence of a gas leak in the container 2 and the location of the leak based on the discrimination result from the discriminating unit 8 is provided to constitute a container leakage inspection apparatus as a whole. I am doing it. An embodiment will be described in which an easy-to-handle, low-toxicity, inexpensive alcohol vapor is used as the gas to be detected, and a high-sensitivity alcohol sensor is used as the gas detection sensor. In the filling device 4, as shown in FIG. 2, the first pipe 4 connected to the alcohol supply path R ₁ is used.
And A, a second pipe 4B connected to the air supply passage R _2, an exhaust pipe 4C for discharging the gas in the container 2, and disposed substantially concentrically formed sequentially larger diameter, first, 2 pipes 4A, 4
B and one end of the exhaust pipe 4C, the opening 2 formed in the container 2
A plug 10 that seals between the large-diameter exhaust pipe 4C and the opening 2A in the state of being inserted into the container 2 from A is provided. Then, in order to fill the container 2 with alcohol vapor using the filling device 4, the on-off valve V connected to the exhaust pipe 4C is closed, and air is pressurized and supplied from the second pipe 4B into the container 2, By supplying the alcohol through the first pipe 4A, the alcohol is vaporized while being sprayed from the lower end of the first pipe 4A, and the inside pressure of the container 2 is 1 kg / cm ² , the alcohol gas concentration is the lower explosion limit concentration 3.5. Set below vol%. Next, after the leakage inspection of the container 2, the on-off valve V is opened, air is supplied into the container 2 from the second pipe 4B,
The alcohol gas in the container 2 is discharged. 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, for example, when the gas detection sensors 5 are arranged in parallel at intervals of 5 cm.
If it is set to 5 cm, the peripheral surface of the container 2 can be inspected over almost the entire surface. As shown in FIG. 3, the sensor mounting device 6 is flexible so as to cover both sides of the gas detection sensor 5 close to the container 2 and efficiently guide the leaked gas from the peripheral surface of the container 2 to the gas detection sensor 5. A sex guard 11 is provided.

[Other Embodiments] The filling device 4 may be one that fills the container 2 with alcohol that has been gasified in advance. The gas to be detected may be a vapor such as a ketone or an ether in addition to the alcohol vapor, and may be another gas. Therefore, the gas detection sensor 5 can detect the gas to be detected. I wish I had it. The display means 9 may be a lamp that lights up when a gas leak is inspected or an alarm device that issues an alarm, a device that marks a leak location, or a defective product on the next conveyor after the inspection. It may be an exclusion device. When inspecting a welded portion of the container 2 or a portion where leakage is likely to occur, when the gas detection sensor 5 approaches the welded portion or a portion where leakage is particularly likely, the rotation device 3 is rotated so as to be stopped for a set time. A rotation control means for controlling the device 3 may be provided, and the gas detection sensor 5 located at the welded portion or a particularly leaky place may be reciprocally moved to perform a more precise leak inspection. Further, instead of rotating the container 2 by the rotating device 3, the gas detection sensor 5 may be rotated around the axis P while the container 2 is stationary. The detection sensor 5 may be relatively rotated together. In the example, the sensor mounting device 6 to which the gas detection sensor 5 is mounted
As shown in FIG. 4, the relative rotation angle is halved by installing the sensor mounting devices 6 and 6 at positions symmetrical to the axis P as shown in FIG. Therefore, the inspection time can be shortened.

Incidentally, although reference numerals are given in the claims of the utility model for convenience of comparison with the drawings, the present invention is not limited to the constitution of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is an overall schematic side view showing a partial cutout.

FIG. 2 is a vertical sectional view of a filling device.

FIG. 3 is a cross-sectional plan view of main parts

FIG. 4 is a cross-sectional plan view of another embodiment.

FIG. 5 is a schematic sectional view of a conventional example.

[Explanation of symbols]

 2 Container 3 Rotating Device 5 Gas Detection Sensor 7 Relative Rotation Angle Detection Means 8 Discrimination Means P Shaft Center 11 Guard Member

Claims (3)

[Scope of utility model registration request] 1. A gas detection sensor for detecting whether or not a detected gas leaks from the inside of the container (2) in which the detected gas is pressurized and enclosed. 5) is provided, and in front of the gas detection sensor (5)
Rotation for rotating the container (2) relatively around the uniaxial core (P)
A leakage inspection device for containers provided with a device (3),
A plurality of the gas detection sensors (5) are provided in the container (2).
One in close proximity and along the uniaxial core (P)
It is said that they are arranged side by side at equal intervals over almost the entire width of
Then, the gas detection sensor (5) is reciprocally moved in the parallel direction.
A moving device for moving the gas detection sensor (5) is provided.
Means for detecting the relative rotation angle of the container (2) with respect to
(7) is provided, and the detection from the relative rotation angle detection means (7) is performed.
Based on the output result and the detection result from the gas detection sensor
A means (8) for determining the leak position of the gas to be detected is provided,
Note that the gas detection sensors on both sides of the multiple gas detection sensors (5)
A pair of gussets forming side walls along the direction in which the sensors (5) are arranged side by side.
A container leakage inspection device provided with a cord member (11) . 2. The pair of guard members (11) are flexible
And is arranged so as to be in close contact with the container.
Leak inspection device for the described container. 3. The plurality of gas detection devices (5) are
Any of claims 1 to 2 provided at a plurality of locations around the axis.
The container leakage inspection device described in 1.