JPH0322580B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a closed-loop penetrant testing device that collects and reuses penetrating liquid and cleaning water.

In penetrant testing, a so-called closed-loop method is known in which the used penetrant and cleaning water are collected and reused from the viewpoint of economy and prevention of environmental pollution.

In the conventional closed-loop method, the test specimen is immersed in a penetrating liquid stored in a tank, then lifted and transferred to an adjacent cleaning tank, where it is sprayed with cleaning water and cleaned. The penetrating liquid and cleaning water are separated in the cleaning tank due to the difference in specific gravity.
The permeate is returned to the permeate tank. (For example, see U.S. Pat. No. 3,926,044.) By the way, in the conventional method described above, the permeate liquid and wash water are separated based on the difference in specific gravity, so the separation is insufficient, and this device also has separate permeate tank and wash tank. Therefore, after the infiltration process is completed, the test specimen must be transferred to a cleaning tank. Therefore, flaw detection work is time-consuming. Furthermore, when flaw detection work is automated, the test object transfer device has a complicated configuration.

Furthermore, in conventional methods and devices, the permeate separated from the wash water in the wash tank is directly returned to the permeate tank. Therefore, a considerable amount of cleaning water is mixed into the penetrating liquid, which may impair the permeability of the penetrating liquid and cause a decrease in flaw detection sensitivity.

This invention was made in order to solve the above-mentioned problems in conventional closed-loop penetrant testing, and it simplifies the testing work and always uses a highly pure penetrating liquid, which is not contaminated with cleaning water, on the test object. The present invention aims to provide a closed-loop penetrant testing device that can be used.

The closed-loop penetrant flaw detection apparatus of the present invention is equipped with a penetrant nozzle group and a cleaning water nozzle group that are arranged to surround a test specimen held in a processing tank. Additionally, this device is equipped with a permeable membrane type permeate separation device. The permeate separator is in communication with the bottom of the treatment tank, the permeate tank and the wash water tank. Furthermore, this device includes a device for force-feeding used wash water from the treatment tank to the permeate separation device, a device for force-feeding the permeate from the permeate tank to the group of permeate jet holes, and a device for pumping the used wash water from the treatment tank to the group of permeate jet holes. It is equipped with a device for pumping.

In the apparatus configured as described above, the test object is transferred and held within the processing tank. The test object is first sprayed with penetrant from the surroundings by a group of penetrant jet holes. Next, the test object is washed with washing water sprayed from the washing water jet holes.
The test article remains in place during these penetrant spraying and cleaning operations. After these operations are completed, the test object is transferred to the next development process.

On the other hand, the cleaning water sprayed onto the test object remains at the bottom of the treatment tank, and is pumped from there to the permeate separator via pump piping and the like. Then, the permeate liquid and the wash water are separated by the permeable membrane and flow into the permeate tank and the wash water tank through piping and the like, respectively.

The separated permeate and wash water are pumped to their respective nozzle groups and reused.

As described above, in the apparatus of the present invention, spraying of the penetrant and cleaning are performed only in one place, that is, in the processing tank, so that the work is simple and the work efficiency can be improved. In addition, transporting the test object becomes easier, and automation becomes easier as well. Furthermore, since a permeable membrane-type permeate separation device is installed separately from the treatment tank, the separated permeate is not contaminated with splashes of washing water, and highly pure permeate is transferred to the permeate jet holes. can be supplied to

Examples of the present invention will be described below.

FIG. 1 shows an example of the apparatus of the present invention.

As shown in this drawing, a first processing tank 6 and a second processing tank 51 are attached to a frame (not shown) along the transport line of the trolley conveyor 1. A hanging fitting 3 is attached to the chain 2 of the trolley conveyor 1, and the hanging fitting 3 is rotatable around a vertical axis.

The first processing tank 6 has a circular shape, and a rotating shaft 9 passes through the center of the bottom 7 and protrudes.
The rotating shaft 9 has a lattice-shaped support 10 fixed to its tip, and is rotationally driven by a motor 11 with a reduction gear. The chain 2 of the trolley conveyor 1 has been lowered to just above the support stand 10, so that the test object T is placed on the support stand 10.

Inside the first treatment tank 6 is a coiled permeate tube 1 surrounding the test specimen T on the support stand 10.
3. A cleaning water pipe 16 and a hot air pipe 19 are attached. Each tube 13, 16, 19 has a large number of jet holes 14, 17, 2 along the circumference of the coil.
0 is provided for each.

The permeate pipe 13 has a permeate tank 22 and a pump 2.
3, connected via piping 24 and electromagnetic valve 25. In addition, the cleaning water pipe 16 includes a cleaning water tank 2.
9 are connected via a pump 30, piping 31, and a solenoid valve 32. Furthermore, hot air tube 1
9 is connected to an air reservoir (not shown) via a pipe 34 and a solenoid valve 35.

A reservoir tank 36 and a permeate separation device 37 are arranged below the first treatment tank 6. The reservoir tank 36 includes the first processing tank 6
A pipe 38 extends from the bottom 7. Further, the bottom of the reservoir tank 36 is connected to a permeate separation device 37 via a pump 39 and piping 40. The permeate separation device 37 includes a permeable membrane (for example, an acetyl cellulose membrane). The permeable membrane allows only water to pass through due to osmotic pressure and separates water and permeate.

The permeate separation device 37 is connected to the permeate tank 22 via a pipe 47, and also to the wash water tank 29 via a pipe 49.

The second processing tank 51 has the same structure as the first processing tank 6, and is provided with a support stand 55 that is rotationally driven by a motor 56. Also, the second
An annular air pipe 64 is arranged within the processing tank 51 . The air pipe 64 is provided with a large number of ejection holes 65 along its circumference. Further, an air reservoir (not shown) is connected to the air pipe 64 via a pipe 75 and a solenoid valve 76.

Dry developer D is supplied into the second processing tonk 51 so as to cover the air pipe 64 . Further, a cover 52 that can be opened and closed is attached to the top opening of the second processing tank 51.

A control panel 83 is attached to the frame (not shown), and the control panel 83 controls the rotation and stopping of the support stands 10 and 55, the driving and stopping of the pumps 23, 30, and 39, and the solenoid valves 25, 32, 35, and 76. It has a built-in control circuit that controls opening and closing.

In the apparatus configured as described above, first, the test object T is placed on the support stand 10 while being suspended from the hanging fitting 3 of the trolley conveyor 1. At the same time as the mounting, the support table 10 is rotated, and the pump 23 is driven to spray the penetrating liquid onto the test object T from the jet hole 14 . At this time, since the hanging fixture 3 is rotatable around the vertical axis as described above, the test specimen T rotates together with the support base 10, and the penetrating liquid is sprayed uniformly over the entire surface.

After the spraying of the penetrating liquid is finished, the nozzle 17
Washing water is jetted out from the test piece T, and excess penetrating liquid on the surface of the test object T is washed away.

When the cleaning is completed, hot air is blown out from the blowing hole 20 and the test object T is dried.

In the above operation, the washed washing water is sent via the reservoir tank 36 to the permeate liquid separation device 37 by the pump 39, where it is separated into the permeate liquid and the wash water, and each is reused.

When the infiltration work is completed as described above, the test object T is transferred to the second processing tank 51 by the trolley conveyor 1. Here, the dry developer D is applied to the surface of the test object T.
In order to supply air, air is blown out while the opening of the second processing tank 51 is covered with the cover 52. As a result, the developer D flies up and sprinkles on the surface of the test object T, forming an indication pattern at the defective portion. Then, the presence or absence of defects is inspected.

This invention is not limited to the above embodiments. For example, when using a penetrating liquid that does not require a developer, the second processing tank 51 and its attached devices are completely unnecessary.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of the device of the present invention. 1... Trolley conveyor, 6, 15... Processing tank, 10, 55... Support stand, 14... Penetrant jet hole, 17... Cleaning water jet hole, 22... Penetrant tank, 23, 30, 39 ... pump, 29 ... washing water tank, 37 ... permeate separation device.

Claims (1)

[Claims] 1 A group of permeate nozzles and a group of cleansing water nozzles arranged to surround the test specimen held in the treatment tank, and a permeable membrane type permeator connected to the bottom of the treatment tank, the permeate tank, and the cleansing water tank, respectively. a liquid separator, a device for force-feeding used wash water from the treatment tank to the permeate separator, a device for force-feeding the permeate from the permeate tank to the permeate jet hole group, and wash water from the wash water tank. a device for force-feeding water to the cleaning water jet hole group.