JPS63188733A - Method for detecting pinhole of container - Google Patents

Abstract

PURPOSE:To speedily detect the pinhole of a container with high accuracy by sucking the air in a section formed by sealing the container with an air bag. CONSTITUTION:The container 11 mounted on, for example, a truck 10 is moved into a gate type structure 1 and a hydraulic cylinder 2 is put in operation to lower a frame body 3. When the frame body 3 reaches a specific position, pressure air is supplied into the air bag 4 from a communicating pipe 6 to expand the air bag 4, which contacts the external surface of the container 11, thereby sealing the contact part between the air bag 4 and the external surface of the container 11. Then the air in the section 5 is sucked through a communicating pipe 9. In this case, if there is a pinhole 12 in the container 11, the pressure in the section 5 does not drops into a specific state. Then the pressure in many small sections formed in the section 5 by a labyrinth 7 is measured by a manometer to detect the position of the lateral pinhole of the container 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for detecting pinholes in containers used in logistics systems.

[Prior art and its problems]

Currently, many containers are used in logistics systems. However, pinholes may occur in this container due to manufacturing errors, poor welding, or corrosion. When cargo is transported in a container having such pinholes, water may enter the container and cause significant damage to the cargo. Under these circumstances, it is necessary to detect the presence or absence of pinholes in a container, but conventionally there is no suitable detection method for this, and workers have no choice but to visually inspect the container. Therefore, not only did pinhole detection work require a great deal of time and effort, but the detection accuracy was extremely poor.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to provide a method for easily and quickly detecting pinholes in containers with high precision. There is a particular thing.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention provides an air bag around the inner surface of the frame so as to form a section, and the air bag is brought into contact with the outer surface of the container to inject pressurized air into the inside of the air bag. In addition to feeding and sealing,
A method for detecting pinholes in a container, characterized in that air in the compartment is sucked.

The present invention detects pinholes in a container while a vehicle carrying a container is stopped at a predetermined location or is moving at a slow speed, and as a detection means, an air bag is brought into contact with the surface of the tentenna. This is used as a partition wall, and the pressure inside the compartment surrounded by this partition wall is reduced, and changes in the reduced pressure state are detected.

If the compartment formed on the surface of the container is too large, even if a change in reduced pressure is detected within the compartment, it is unclear in which part of the compartment the pinhole exists. Therefore, in a preferred embodiment, it is most suitable to divide the compartment into a number of small compartments and to detect changes in the reduced pressure state within the compartments.

As a means for dividing the compartment into a large number of compartments, it is preferable to divide the compartments by using a labyrinth backing made of a flexible member so as to cross between the airbags arranged in parallel.

There are methods for detecting pinholes using pressurized and depressurized conditions, but numerous experiments have shown that it is easier to detect pinholes in depressurized conditions than in pressurized conditions. .

A manometer is generally used as a means for detecting changes in the reduced pressure state. However, when an electrical sensor for detecting pressure changes is used, pressure changes at multiple points can be detected, which simplifies the configuration of the device.

The present invention is characterized in that a flexible air bag is pressed into contact with a container having an uneven surface to seal it, the interior of this sealed compartment is maintained in a reduced pressure state, and changes in the reduced pressure state are detected. be. In this way, pinholes in the container can be easily detected by detecting changes in pressure within the compartment. This pinhole detection is an extremely advantageous method because it can be performed even on moving containers.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the container pinhole detection method according to the present invention will be described below with reference to the drawings.

1 is a perspective view showing an example of an apparatus for carrying out the detection method according to the present invention, FIG. 2 is a bottom view of the detection section, FIG. 3 is a cross-sectional view taken along line mm in FIG. The figure is a pressure change diagram drawn corresponding to FIG. 3, and FIG. 5 is an explanatory cross-sectional view showing the sealed state of the airbag.

1 is a concave structure, and a frame 3 is attached to this concave structure 1 and is moved up and down by a hydraulic cylinder 2. As shown in FIG. As shown in FIGS. 2, 3, and 5, the frame 3 is provided with an air bag 4 around its inner surface, and has a section 5 formed in its center. As shown in FIG. 5, the air bag 4 is connected to a communication pipe 6 that is connected to a pressurized air supply source.

A large number of labyrinths 7 extending in the width direction of the frame body 3 are disposed within the compartment 5, and the labyrinths 7 form a large number of small compartments 8, and each small compartment 8 is connected to a manometer. A tube 9 is provided. In addition,
Each small section 8 may be provided with an electrical pressure sensor instead of the connecting pipe 9.

In the detection device having the above configuration, as shown in FIG.
When the frame body 3 is moved into the gate-shaped structure 1, the hydraulic cylinder 2 is operated and the frame body 3 is lowered. When the frame body 3 reaches a predetermined position, pressurized air is supplied from the communication pipe 6 into the air bag 4 to inflate the air bag 4 and contact the outer surface of the container 11. Seal the contact area with the After that, the air in the compartment 5 is sucked through the communication pipe 9.

In this case, if there is a pinhole 12 in the container 11, the pressure in the compartment 5 will not decrease to a predetermined state.
The longitudinal position of the container 11 can be determined. and parcel 8
By measuring the pressure of container 11 with a manometer
The position of the pinhole 12 in the width direction can be detected.

In this embodiment, a case has been described in which the frame 1 is configured to detect the pinhole 12 on the top surface of the container 11. However, when detecting the pinhole 12 on the side surface of the container 11, the frame 1 is configured in a gate shape. The air hook 4 may be arranged so as to extend below the gate frame 1.

〔Effect of the invention〕

As is clear from the above description, according to the method for detecting pinholes 12 in a container 11 according to the present invention, a section 5 sealed by an air bag 4 is formed, air in this section 5 is sucked, and the pressure is reduced. Since the position of the pinhole can be detected by a simple method of detection, not only can the work time be shortened, but also the detection can be performed with high precision. One aspect of the present invention is that the sealing section can be formed using a flexible air bag knob, so that the compressed air supplied to the air bag can be automatically taken in and out, and the air bag can be installed in a car that is moving slowly. It is possible to detect pinholes in containers that have been removed, and in this case, a large number of containers can be efficiently inspected.

[Brief explanation of the drawing]

1 shows an embodiment of a device for carrying out the method for detecting pinholes in containers according to the present invention, FIG. 1 is a perspective view showing the overall structure of the pinhole detection device, and FIG. 2 is a perspective view of the device. 3 is a cross-sectional view taken along the line ■-■ in FIG. 2, FIG. 4 is a line diagram showing changes in pressure within the small section formed on the bottom of the frame, and FIG. FIG. 3 is a cross-sectional view showing a situation where an airbag is pressed against a container. 1... Gate-shaped structure, 2... Hydraulic piston, 3...
Frame body, 4... Air bag, 5... Compartment, 6.9.
...Communication pipe, 7...Labyrinth, 8...Small division, 1
0...Truck, 11...Container, 12...Pinhole.

Claims (1)

[Claims] An air bag is provided around the inner surface of the frame so as to form a partition, and the air bag is brought into contact with the outer surface of the container,
A method for detecting pinholes in a container, comprising supplying pressurized air to the inside of the air bag to seal it, and sucking air in the compartment.