JPH0714886Y2 - Ultrasonic inspection device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an ultrasonic inspection apparatus for automatically inspecting a flaw on a welded part of a subject by a water immersion flaw detection. Even if the water in the water tank where the flaw detection is performed is polluted, water with a low degree of pollution can be interposed between the subject and the probe, and air bubbles on each relative surface between the subject and the probe can be removed. The present invention relates to an ultrasonic inspection apparatus suitable for.

[Conventional technology]

While introducing and unloading welding parts to the inspection position, ultrasonic inspection equipment that automatically performs inspections such as the presence of welding defects in a short time of about 10 to 30 seconds is being introduced in each technical field. is there. An outline of the general example will be described below with reference to FIG. In the figure, 1 is a water tank for immersion flaw detection,
Water 1a as a medium is stored inside. 2 is a tank 1
It is a rotary table installed inside and can be rotated by a motor 2a as required. Reference numeral 3 denotes a subject placed on the turntable 2, and the subject 3 is carried into the water tank 1 or carried out of the water tank 1 by an automatically operated carrier device (not shown). Reference numeral 4 denotes a probe that is supported in the water tank 1 by a positioner (not shown) so as to face the subject 3. Reference numeral 5 is a float water tank connected to the water tank 1 by a communication pipe 6, and the float water tank 5 has a float 7 which is vertically moved by a cylinder 8 inside the float water tank 5.
Is inserted, and the water level in the water tank 1 is changed via the communication pipe 6 by the vertical displacement of the float 7.

The ultrasonic inspection apparatus having the above-described configuration is particularly suitable for detecting a circumferential welded portion or the like of a cylindrical or cylindrical subject. At the time of flaw detection, when the subject 3 is carried into the water tank 1 or when the subject 3 is carried out of the water tank 1, the float 7 is moved upward to move the water level of the water 1a in the water tank 1 to the rotary table 2. Lower until exposed. This is to reduce the amount of bubbles generated on the surface of the subject 3 as much as possible and to prevent the carrier of the subject 3 from getting wet with the water 1a as much as possible. To be done.

[Problems to be solved by the device]

As described above, the operation of changing the water level in the water tank 1 is performed for each subject 3, but the number of subjects 3 to be inspected by such an ultrasonic inspection device is usually large, and 1000 In many cases, more than one piece is inspected by one inspection device. And
Subject 3 is inspected at a still high temperature after welding,
In addition to dust, spatter etc. may adhere to the subject 3. Because of these inspection conditions, the water 1a in the water tank 1 gradually decreases as the pollution progresses, and when the probe 4 is inspected downward as in the example shown in FIG. There are various problems that it is difficult to maintain the inspection accuracy, such as bubbles tending to adhere to the probe 4.

In view of the above-mentioned problems of the prior art, the present invention has a low contamination level between the subject 3 and the probe 4 even if the water 1a in the water tank 1 is contaminated during flaw detection. Can be in a state,
At the same time, it is an object of the present invention to provide an ultrasonic inspection apparatus capable of removing bubbles even if bubbles are present on the relative surfaces of the subject 3 and the probe 4.

[Means for Solving the Problems]

In order to achieve the above object, the ultrasonic inspection apparatus of the present invention comprises:
A water tank in which the subject and the probe are relatively arranged so that they can be subjected to water flaw detection, and a float water tank for changing the water level, which is connected to the water tank by a communication pipe and arbitrarily changes the water level in the water tank by the displacement of the float In the ultrasonic inspection apparatus, a tank provided in addition to the float water tank for supplying water to the water tank, and water in the float water tank provided in a pipe line connecting both the tank and the float water tank. A valve that regulates the outflow amount and a valve that regulates the outflow amount of water in the tank; and a pump that sucks the water in the tank or the float water tank through a strainer from a pipeline between the valves,
Through the adjusting valve for adjusting the flow rate of the discharge water of the pump, the object to be examined in the water tank, the probe and the nozzle ejecting therebetween, and the surplus water generated in the float water tank are fed into the tank. And a drain pipe.

[Action]

By configuring the ultrasonic inspection apparatus of the present invention as described above, at the start of flaw detection, the valve that controls the outflow amount of water in the float water tank is closed and the valve that controls the outflow amount of water in the tank is opened. When the pump is operated, the water in the tank is discharged from the pump through the strainer, and the discharged water is sent to the nozzle in the water tank for water immersion flaw detection through the adjustment valve that adjusts the flow rate, It is ejected from the nozzle between the subject and the probe. In this case, the water ejected from the nozzle is new water in the tank, and since dust etc. is removed through the strainer, even if the water in the water tank for immersion flaw detection is contaminated, Water with a low degree of pollution is placed between the probe and the probe, and at the same time, even if bubbles are generated on the relative surface between the subject and the probe, those bubbles are removed by the jet of water. Therefore, it is possible to set the preferable flaw detection start conditions. Then, the rotary table 2 is rotated to start flaw detection. During the flaw detection, the amount of water ejected from the nozzle is the amount of water discharged from the pump adjusted by the adjustment valve. A little more than the amount of water that decreases. Then, excess water generated due to increasing the amount is supplied to the tank by a drain pipe provided in the float water tank so as to be circulated.
The relationship between the water tank and the float water tank, which are connected by a communication pipe, can always be maintained in a constant state.

〔Example〕

An embodiment of the present invention will be described with reference to FIG. In the figure, the same symbols as those in FIG. 2 indicate the same items. In the figure, 9
Is a tank for supplying water to the water tank 1, 10 is a pipe connecting the float water tank 5 and the tank 9, 11 is a valve for regulating the outflow amount of water in the float water tank 5 provided in the pipe 10, 12 Is a valve for regulating the outflow amount of water in the tank 9 which is also provided in the pipeline 10. 10a is a conduit 10 between valves 11 and 12
At the branch point of the pump 14 via the strainer 13 including the water purifier or the water purifier in the pipeline from the branch point 10a to the water tank 1.
Is provided on the discharge side of the pump 14, and an adjustment valve 15 for adjusting the flow rate of the discharged water is provided. Here, the pump 14 can be operated for a certain period of time (for example, about 10 seconds to 30 seconds). Reference numeral 16 is a nozzle for ejecting the water sent through the adjusting valve 15 into the subject 3, the probe 4, and the both facing each other in the water tank 1, and 17 is surplus water generated in the float water tank 5. In case of excess water tank 9
It is a drain pipe for sending water inside.

When the subject 3 is placed on the turntable 2, the valve 11
Is closed and the valve 12 is opened to drive the pump 14 to discharge the water in the tank 9 through the strainer 13. The flow rate of the discharged water is adjusted by the adjustment valve 15 and the nozzle
The water is sent to the nozzle 16, and the nozzle 16 jets new water in the tank 9 from which dust and the like have been removed by the strainer 13 to the subject 3, the probe 4 and between the two. Even if the water 1a in the water tank 1 is polluted by this jet, the water whose polluted degree is reduced due to new water is present between the subject 3 and the probe 4, and at the same time, The bubbles generated on the relative surface between the sample 3 and the probe 4 are removed by the jetted water flow, and a preferable flaw detection start condition is set. Then, the rotary table 2 is rotated and the flaw detection is started, usually about 10
One cycle is completed in 30 seconds to 30 seconds, and the flaw inspection is completed. Here, the amount of water ejected from the nozzle 16 is adjusted by arbitrarily squeezing it by the adjusting valve 15, and the squeeze is slightly larger than the amount of water in which the water 1a in the water tank 1 decreases for each test of each subject. The surplus water generated by squeezing it to the extent that
The drain pipe 17 feeds water from the float water tank 5 to the tank 9 for circulation. This has the effect of keeping the water level relationship between the water tank 1 and the float water tank 5 connected by the communication pipe 6 always constant.

In the initial stage where the water 1a in the water tank 1 is not polluted, the pump 14 is driven with the valve 11 opened and the valve 12 closed, so that the water tank 1 and the float water tank 5 are separated without using the tank 9. It is possible to perform a flaw detection inspection in the same manner as described above by circulating the space.

[Effect of device]

Since the present invention is configured as described above, even when the water 1a in the water tank 1 is polluted at the time of flaw detection, it is not polluted between the subject and the probe. Since new water can be jetted and supplied, water with low pollution level is made to exist between the subject and the probe, and at the same time, the relative surface between the subject and the probe is Even if bubbles are generated, the bubbles can be removed, and the inspection accuracy can be improved.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an ultrasonic inspection apparatus showing an embodiment of the present invention. FIG. 2 is a diagram showing an outline of a general example of a conventional ultrasonic inspection apparatus. 1 ... water tank, 1a ... water, 3 ... subject, 4 ... probe,
5 ... Float water tank, 6 ... Communication pipe, 7 ... Float,
9 ... Tank, 10 ... Pipe line, 11, 12 ... Valve, 13 ...
Strainer, 14 …… Pump, 15 …… Regulator valve, 16 ……
Nozzle, 17 ... Drain line.

Claims (1)

[Scope of utility model registration request] 1. A water tank for arranging a subject and a probe relative to each other so as to be capable of water immersion flaw detection, and a water tank for varying the water level which is connected to the water tank by a communication pipe to arbitrarily change the water level in the water tank by displacement of a float. In an ultrasonic inspection apparatus having a float water tank, a tank provided in addition to the float water tank for supplying water to the water tank, and a pipe provided between the tank and the float water tank. A valve for controlling the outflow amount of water in the float water tank, a valve for controlling the outflow amount of water in the tank, and a pump for sucking the water in the tank or the float water tank through a strainer from a pipe line between the valves. , An object to be examined in the water tank, a probe and a nozzle ejecting therebetween, and excess water generated in the float water tank through an adjusting valve for adjusting the flow rate of the discharge water of the pump. Ultrasonic inspection apparatus is characterized in that and a drain line for water in serial tank.