JPS6085349A - Method and apparatus for checking leakage of drum - Google Patents

Abstract

PURPOSE:To ensure checking, by immersing a drum in the water after it is pressurized by the pressure that can be checked, collecting leaked air, detecting the air by a U-shaped manometer, thereby checking the quality of the drum based on the presence or absence of the leaked air. CONSTITUTION:A drum 11 is held between holding plates 6 through a packing 7 by a motor M, a screw rod 5, and a moving arm 4 in an airtight manner. Then a valve 9 is opened, and compressed air is sent. When 1-2kg/cm<2> is attained, the valve 9 is closed. A hood 12 is applied on the drum 11. Thereafter a lift frame 2 is lowered by an air cylinder 3, and the drum 11 is immersed in the water. An electromagnetic valve 16 is opened, and the air, which is attached to the outer surface of the drum 11, and the air in the food 12 are discharged to atmosphere through a pipe 14. Then the valve 16 is closed. When the air leaks from the drum 11, the air is collected by the hood 12 and further collected to a manometer 15 through the small hole of a swelled part 12a. Then the leakage is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for reliably inspecting the presence or absence of leakage using a simple method when a drum can is completely recycled. ,
We use cans that have had their dents corrected and have passed all pressure leakage tests. Various methods have been used to perform this leakage test, but no reliable method has yet been proposed.

In view of this, the present invention is designed to reliably detect minute gaps and holes that could not be detected using conventional inspection methods, and to perform leakage inspection using a simple method. After supplying air to reach the lower end of the drum that can be inspected and pressurizing it to the desired pressure, the drum can is completely submerged in water.
The leaked air is collected and detected by a U-shaped manometer, and the condition of the drum can is determined depending on the presence or absence of air leakage.

It is characterized by being designed to inspect for defects.

The following description will be made based on an embodiment of the present invention '71.

In the figure, 1 is a water tank having a size necessary to submerge the drum can 11 to be inspected for leakage, and the water tank is always filled with 1 liter of water or rust inhibitor to completely submerge the drum can. 7 vertical frames 2 for filling the water or liquid and suspending the inspection drum can above the water tank.
be installed so that it can be raised and lowered freely. Various means can be used to raise and lower the lifting frame 2. In the illustrated embodiment, the lifting frame 2 is supported by near cylinders 3.3 provided on both sides of the water tank, and within a preset range. It is raised and lowered.

The lifting frame 2 is provided with a swing arm 4.4 having a pin P1. If the upper end of the arm 4.4 is provided so as to be swingable via P2'r, the screw rod 5 will be driven by a drive device for swinging the arm, such as a motor M via a clutch or the like. By rotating the screw rod 5 in the forward and reverse directions, the two arms 4.4 are brought into substantially synchronization and swung toward and away from each other.

and a clamping plate 6.6 at the lower end of the moving element 4.4.
are arranged opposite to each other, facing both end surfaces of the drum can, and are configured to clamp both end surfaces of the drum can by swinging of the drum. ) is provided on the inner surface thereof with a punch 7 which is pressed into contact with the outer periphery of the end surface of the drum to create a predetermined gap between the end surface of the drum and the clamping plate and to keep this gap airtight. Sara 1
Inside this airtight gap, a supply pipe 8 for supplying air to the wire is connected to one side, that is, to the right clamping plate shown in the drawing, and a supply pipe 8I is provided with moss pulp 9. The pulp 9 is connected to an air supply pipe 10 connected to a compressed air source, and the pulp 9 is selectively opened and closed. This pulp may be of a manual type or an automatic type, but it is preferable to use an automatic pulp when performing a leak test of a drum can automatically.

Also, opposing clamping plates 6. The lifting frame 2Icw is provided with a 7-door 12 which covers at least the upper outer periphery or the upper half outer periphery and the upper half end surface of the drum can 11 held between the drum cans 11 and 6, which is separate from the lifting frame. The lifting cylinder 11 for the hood can be raised and lowered via the cylinder 13 so that it can be raised and lowered freely.
It is suspended from the frame. Then, one or two parts of the top of this 7-door should bulge out a little upwards so that the air leaking from either of the drum cans will rise inside the 7-door and collect at the top. A small hole is bored in the center of this bulging part 12m, and a pipe 14 is connected to the bulging part 12a so that the collected leaked air is guided to the outside. A U-shaped manometer 15 is provided at the tip of this pipe 14, and a sensor for detecting the liquid level, such as a Koden tube, is provided at the liquid level position of the manometer to automatically check for air leakage. Eggplant. A solenoid valve 16 is provided in the middle of the pipe 14, and air other than leakage, such as air stuck on the outer surface of the drum can, is opened to be released to the atmosphere.

When performing a leakage test on a drum can using the apparatus configured as described above, first the drum can 11 is supplied between the open clamping plates 6 and 6, and then the screw is inserted through the motor IJI.
By fully rotating the rod 5, the swinging arm 4, which is pivotally connected to the lifting 7 frame 1, is swung, and when the clamping plates are moved toward the moon C, both ends of the drum can are pressed. be held in place. At this time, the end face of the drum can, which is the opening part i, is forcibly pressed with a backing in an airtight manner. This pulp 9 is then opened and compressed air is supplied into the end of the drum to provide a constant test pressure. This test pressure is not limited, but it can be arbitrarily determined as long as it is higher than atmospheric pressure, but it is usually used in the range of 1 to 2 (/-). While the pulp 9 was closed and the inside of the drum end was maintained at a constant pressure, the entire 7-domain waiting above the drum can was lowered using its elevating device.
- Cover all drum cans. This lowering of the hood can be performed after the drum can is fully clamped by the clamping plates, or after the end of the drum is submerged in the water tank. Next, lower each elevating frame by operating an air cylinder so that the end of the drum is submerged into the water tank. When the drum is submerged in water, or immediately after submergence, the solenoid valve 16 is opened, and the air that has adhered to the outer surface of the drum end and the air inside the drum are first passed through the entire solenoid valve 16 from the pipe 14. Release into the atmosphere.

Next, after exhausting all the air inside the outside of the drum can when the drum is submerged in water, except for the air leaking from the end of the drum, the solenoid valve is closed. This can be done automatically by setting the time after the drum can is submerged in water in advance. When the drum is submerged in water, if there are pinholes or cracks at the end of the drum, air leakage will occur, and the air that comes out from the end of the drum will be collected at the 7-door, and the bulge will be small (W 12 g). The pipe 14 is guided through the hole to a manometer 15, and the liquid level at the meter changes depending on the amount of leaked air. This liquid level change may be detected visually, but if it is done automatically, a sensor such as a phototube is installed to detect when the liquid level has changed beyond the allowable range from the set liquid level. This is used to determine whether the drum end is defective.

If there is no air leakage from the end of the drum, the manometer will not detect a change in the liquid level, and this end of the drum will be determined to be a good product. After the inspection is completed, the elevating frame is raised, and after the drum has been raised, the grip is released, the end of the drum is ejected, the primary drum is gripped, and continuous inspection is carried out in the same manner.

According to the present invention, the end of the drum is clamped and releasably supported at the upper part of the water tank, compressed air is supplied and pressurized to the desired pressure that can be inspected, and the end of the drum is held at 7-degrees. Since it is submerged into the water tank after being covered, if there is a pinhole etc. at the end of the drum, the air inside the end of the drum will leak, and the
- This leaked air is collected by a manometer and can be automatically and reliably detected as a defective product, and even small leaks that cannot be detected with the naked eye can be easily detected. There is an advantage that it can be done.

4 Additional related original invention (#Application No. 58-1701691 is a method in which a special gas is injected into a drum can, then dried with air and a trowel, and the leaking gas concentration is detected with a gas detector. In the present invention, only air is supplied into the end of the pressurized drum under pressure, and leaking air is detected using a manometer based on changes in the hydraulic pressure.

[Brief explanation of the drawing]

Figure 1 of the hani is a front view, and figure 2 is a side view.100. aquarium 2.8. lifting frame 621. air cylinder 411. swinging arm 500. screw rod 600. clamping plate 711. Patsukin 809. supply pipe 900. pulp 101. , air supply pipe 11 0. , drum end 120.7-do 12a, bulging part 13,... 7-door lifting cylinder 11-door 14°, pipe 1501. manometer 1601. solenoid valve Ml,, motor Patent applicant Tadashi Yokoe Patent applicant Yokoe-2 Outside 1 person

Claims (1)

[Claims] (11 Leakage (n) After supplying and pressurizing air so as to reach the end of the drum that can be inspected for the presence or absence of leakage, the drum can is submerged in water to collect the leaked air and form a U-shape. A drum can leakage inspection method characterized by inspecting whether the drum can is good or bad based on the presence or absence of air leakage detected by a manometer. (2) Lifting and lowering by holding the drum can above the water tank. Seven frames are provided that can be freely raised and lowered, and the frame is equipped with a clamping plate facing the end surface of the drum can, a swinging arm that moves the clamping plate in the approaching and separating directions, and an electric motor that swings and drives the arm. At the same time, pulp for supplying pressurized air for leakage inspection is installed inside the end of the drum, which is sealed with one clamping plate.
A drum can leakage inspection device is provided above the clamping drum, and is provided with a seven-door for collecting leaked air and a U-shaped manometer connected to the seven-door.