JP2013148383A - Ultrasonic flaw detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultrasonic flaw detector 1000 performing ultrasonic flaw detection in water filled in a water tank and obtaining high inspection accuracy by suppressing deformation of a test body in an ultrasonic passage area in the water tank.SOLUTION: An ultrasonic flaw detector comprises: a first pressing mechanism unit 230; and a second pressing mechanism unit 240. The first pressing mechanism unit 230 is placed in water of a water tank 200 on a side of an entrance side packing 210 just before a probe T1, among probes T1-T4, placed nearest to the entrance side packing 210 in a conveyance direction 102. The second pressing mechanism unit 240 is placed in water of the water tank 200 on a side of an exit side packing 220 just after the probe T4, among the probes T1-T4, placed nearest to the exit side packing 220 in the conveyance direction 102.

Description

  The present invention relates to an ultrasonic flaw detection apparatus that performs ultrasonic flaw detection in water filled in a water tank.

FIGS. 16 and 17 are diagrams showing a conventional ultrasonic flaw detector that performs ultrasonic flaw detection in water filled in a water tank.
FIG. 16 is a diagram schematically showing a configuration of a conventional ultrasonic flaw detector. In FIG. 16, only one specimen 400 is shown, but actually, the specimen 400 is continuously conveyed to the water tank 200 in about 0.5 seconds.
FIG. 17 is a view showing a state of deflection (elastic deformation) of the tip of the test body 400 in a conventional ultrasonic flaw detector.

(Overview of ultrasonic flaw detection)
As shown in FIG. 16, the test specimen 400 is held by the upper roll mechanism 311 and the lower roll mechanism 312 of the entrance-side press mechanism 310, and the test specimen transport direction 102 (hereinafter, simply referred to as “test specimen transport direction 102”). (Referred to as conveyance direction). Thereby, the test body 400 enters the water 104 inside the water tank 200 from the entrance side packing 210. In the water tank 200, a plurality of probes T1 to T4 are installed in the probe holder 110 in a range L21. The test body 400 is sent out from the outlet side packing 220 while being irradiated with ultrasonic waves from the probe, and the tip thereof reaches the outlet side pressing mechanism 320. When the tip of the test body 400 reaches the outlet side pressing mechanism portion 320, the upper roll mechanism 321 descends to press the test body 400 together with the lower roll mechanism 322, and the lower roll mechanism 322 is driven to transport the test body 400 in the transport direction. Send to 102. Through the above operation, ultrasonic testing of the specimen 400 is performed in the range L21. The reason why the probe is disposed in the water 104 of the water tank 200 and ultrasonic flaw detection is performed in water is to increase the transmission efficiency of the ultrasonic waves between the probes T1 to T4 and the test body 400. It is.

  In the conventional ultrasonic flaw detector shown in FIG. 16, the holding mechanism portions 310 and 320 of the test body are arranged outside the water tank, and are provided at positions away from the probe arranged in the water tank. . For this reason, in the test body with small rigidity and the test body with large bending, the probe and the test are performed except when the test body 400 is pressed by the pressing mechanism portions 310 and 320 of the test body on both outer sides of the water tank 200. My core did not match. That is, as shown in FIG. 17, when the test body 400 is pressed only on the entrance side pressing mechanism 310 side, the tip of the test body 400 may be bent as shown in FIG. 17 such that the dimension H1 <H2 <H3. there were. The same applies to the case where pressing is performed only on the outlet side pressing mechanism portion 320 side. When the test body 400 is deformed as shown in FIG. 17, the cores of the probe and the test body are not aligned, and there is a problem in terms of inspection accuracy.

JP 2001-116729 A

  An object of the present invention is to provide an ultrasonic flaw detection apparatus 1000 that can obtain high inspection accuracy by suppressing deformation of the test body 400 in the ultrasonic wave passage area in the water tank 200.

A rod-shaped body that passes through the liquid in the test tank filled with the liquid in a substantially linear path, enters the liquid from the atmosphere through the test body entrance formed in the test tank, and enters the test tank. An ultrasonic flaw detection apparatus for ultrasonic flaw detection of a rod-shaped test body, which is a rod-shaped body that exits from the liquid to the atmosphere via the formed test body outlet,
Ultrasonic waves are transmitted to the rod-shaped specimen, and echoes of the transmitted ultrasonic waves are detected, and the rod-shaped specimen is sequentially placed in the liquid in the passing direction from the specimen entrance to the specimen outlet. With multiple probes installed in
Among the plurality of probes, the liquid in the test tank is placed on the side of the test body entrance immediately before the first probe which is the probe installed closest to the test body entrance in the passing direction. A first test body pressing mechanism that is installed inside and receives the tip of the bar-shaped test body that has entered through the entrance of the test body, and feeds it in the passing direction while pressing the bar-shaped test body;
Among the plurality of probes, in the liquid in the test tank immediately after the last probe, which is the probe installed closest to the specimen outlet in the passing direction, on the specimen outlet side. The tip of the rod-shaped test body sent out by the first test body pressing mechanism is received and sent out from the liquid to the atmosphere through the test body outlet while pressing the rod-shaped test body. And a second specimen holding mechanism part.

The rod-shaped specimen is
It is transported by a transport mechanism that is driven and controlled by a transport control device, and enters the liquid from the atmosphere through the specimen entrance,
The ultrasonic flaw detector further comprises:
Predetermined information possessed by the transport control device is input from the transport control device, and the first test body pressing mechanism portion and the second test body pressing mechanism portion are controlled based on the input predetermined information. A presser control unit is provided.

The ultrasonic flaw detector further comprises:
The first test body pressing mechanism section includes a first liquid ejecting section that ejects liquid around a position where the tip of the rod-shaped test body is received.

The ultrasonic flaw detector further comprises:
The second test body pressing mechanism section includes a second liquid ejecting section that ejects liquid around a position where the tip of the rod-shaped test body is received.

The first liquid ejecting unit and the second liquid ejecting unit are:
The liquid is ejected from below the vicinity of receiving the tip of the rod-shaped specimen.

The ultrasonic flaw detector further comprises:
An ejection control unit that controls the flow rate of the liquid ejected by the liquid ejecting unit is provided.

According to the present invention, in an ultrasonic flaw detection apparatus that performs ultrasonic flaw detection in water filled in a water tank,
It is possible to provide an ultrasonic flaw detector 1000 that can suppress the deformation of the specimen in the ultrasonic wave passage area in the water tank and obtain high inspection accuracy.

1 is a configuration diagram of an ultrasonic flaw detector 1000 according to Embodiment 1. FIG. The figure which shows the 1st holding | suppressing mechanism part 230 by the arrow W of FIG. FIG. 3 is a configuration diagram of an ultrasonic flaw detector 1000 according to a second embodiment. The perspective view which shows typically arrangement | positioning of the probe T1-T4 of Embodiment 2. FIG. The figure which drew the probes T1-T4 of Embodiment 2 on the conveyance direction 102 arrow. The figure explaining the effect of arrangement | positioning of the probes T1-T4 of Embodiment 2. FIG. FIG. 5 is a diagram showing a configuration for mounting four probes according to the second embodiment. FIG. 5 is a diagram illustrating an arrangement of four probes according to the second embodiment. The figure which shows the attachment arrangement | positioning of eight probes of Embodiment 2. FIG. FIG. 5 is a configuration diagram of an ultrasonic flaw detector 1000 according to a third embodiment. FIG. 6 shows a bubble removal cassette 160 according to a third embodiment. FIG. 5 shows an opening forming packing 140 according to a third embodiment. FIG. 5 shows a slit forming packing 150 according to the third embodiment. AA sectional drawing of FIG. The figure which shows the front-end | tip of the water injection nozzles 131 and 132 for probes of Embodiment 3. FIG. The figure which shows a prior art. The figure which shows a prior art.

Embodiment 1 FIG.
An ultrasonic flaw detector 1000 according to Embodiment 1 will be described with reference to FIGS. 1 and 2.
(1) FIG. 1 is a diagram schematically showing a configuration of an ultrasonic flaw detector 1000 according to the first embodiment. FIG. 1 is similar to FIG. 16 described in the background art, but is characterized in that the first pressing mechanism 230 and the second pressing mechanism 240 are arranged in the water in the water tank 200 (test tank). .
(2) Further, the feature is that the pressing mechanism local nozzles 251 and 252 and the pressing mechanism local nozzles 261 and 262 are arranged in each of the first pressing mechanism portion 230 and the second pressing mechanism portion 240. In addition, the same code | symbol was attached | subjected to the component equivalent to FIG. 16, FIG. 17 of background art.

First, the features of the ultrasonic flaw detector 1000 will be described. As shown in FIG. 1, the ultrasonic flaw detector 1000 according to Embodiment 1 includes a first pressing mechanism 230 and a second pressing mechanism 240 inside the water tank 200. That is, the first pressing mechanism 230 is disposed immediately before the array probe T1 on the entrance side packing 210 side. Further, the second pressing mechanism 240 is arranged immediately after the last probe T4 of the array probes, which is on the outlet side packing 220 side. In the conveyance direction 102 of the test body 400, the distance L23 (FIG. 1) between the first pressing mechanism 230 and the second pressing mechanism 240 is shorter than the distance L22 in FIG. That means
L23 <L22
It was.
The specimen 400 can be transported to a V roll section (described later) of the lower roll mechanisms 232 and 242 at a short distance in the length direction of the test body 400. For this reason, since the bending of the test body 400 (FIG. 17) and drooping due to low rigidity can be suppressed, the core between the probe and the test body in each of a plurality of probes arranged in the transport direction of the test body. Can be combined. Accordingly, there is an effect that the unstable section of the ultrasonic signal generated at the front end portion and the rear end portion of the test body can be greatly shortened.

(Configuration of ultrasonic flaw detector 1000)
The ultrasonic flaw detector 1000 includes a plurality of probes T <b> 1 to T <b> 4 disposed in the water of the water tank 200, a first pressing mechanism 230 disposed in the water of the water tank 200, and a first disposed in the water of the water tank 200. 2 holding mechanism portions 240, holding mechanism local nozzles 251 and 252 (inlet side) disposed in the water of the water tank 200, holding mechanism local nozzles 261 and 262 (outlet side), and the like.

(Test body 400)
In FIG. 1, a test body 400 (bar-shaped test body) is assumed to be a bar-shaped body that passes through the water in the water tank 200 with a substantially straight track 106 (shown below the probe T2). The test body 400 is conveyed from the atmosphere via the entrance-side packing 210 (test body entrance) which is the entrance of the test body 400 formed in the water tank 200 by being transported to the transport mechanism 410 on the entrance-side packing 210 side. It enters the water of the water tank 200. Then, the probe is sent out by the first pressing mechanism 230, the probe is irradiated with ultrasonic waves, and sent to the second pressing mechanism 240, so that the probe is submerged via the outlet side packing 220, which is the specimen outlet. Then, it goes out to the atmosphere to the conveyance mechanism 420 on the outlet side packing 220 side. Note that the test body 400 has a length of about 3 m to 6 m and a diameter φd of about 18 mm to 120 mm, for example. However, this dimension is an example. The test body 400 has a circular, rectangular, or polygonal cross section, but is not particularly limited. In the ultrasonic flaw detector 1000 of FIG. 1, the test body 400 having a length of about 3 m to 6 m as described above is carried into the water tank 200 at intervals of about 0.5 seconds.

(Probe)
The plurality of probes T1 to T4 in FIG. 1 transmit ultrasonic waves to the test body 400, and detect echoes of the transmitted ultrasonic waves. The probes T1 and the like are installed in water one by one in the transport direction 102 (passing direction) in which the test body 400 is directed from the entrance side packing 210 to the exit side packing 220.

(First pressing mechanism 230)
2 is an arrow view of the first pressing mechanism 230 in the W direction (FIG. 1). The first pressing mechanism 230 will also be described with reference to FIG. The first pressing mechanism 230 includes an upper roll mechanism 231 and a lower roll mechanism 232. The upper roll mechanism 231 includes rolls 231-1 and 231-2. The lower roll mechanism 232 includes rolls 232-1 and 232-2. The first pressing mechanism 230 includes, among the plurality of probes, the entrance side packing 210 immediately before the probe T1 (first probe) installed closest to the entrance side packing 210 in the transport direction 102. It is installed in the water of the aquarium 200 on the side of this. The first pressing mechanism 230 receives the tip of the test body 400 that has entered through the entrance-side packing 210, and presses the test body 400 with the upper roll mechanism 231 and the lower roll mechanism 232 while lowering the lower roll mechanism. The test body 400 is sent out in the transport direction 102 by the driving force (rotational force) 232.

(Second pressing mechanism 240)
The configuration of the second pressing mechanism 240 is the same as that of the first pressing mechanism 230. The second pressing mechanism 240 includes an upper roll mechanism 241 and a lower roll mechanism 242. The upper roll mechanism 241 includes rolls 241-1 and 241-2. The lower roll mechanism 242 includes rolls 242-1 and 242-2. The second pressing mechanism 240 is immediately after a probe T4 (last probe), which is a probe installed closest to the outlet side packing 220 in the transport direction 102 among the plurality of probes. The water tank 200 is installed in the water on the outlet side packing 220 side. The second pressing mechanism 240 receives the tip of the test body 400 sent out by the first pressing mechanism 230 and presses down the test body 400 with the upper roll mechanism 241 and the lower roll mechanism 242 while lowering the test body 400. With the driving force (rotational force) of the side roll mechanism 242, the test body 400 is sent out from the water to the transport mechanism 420 in the atmosphere via the outlet side packing 220.

(Control unit 120)
As shown in FIG. 1, the test body 400 is transported by a transport mechanism 410 (transport mechanism) driven and controlled by the transport control device 430 and enters the water from the atmosphere via the inlet side packing 210. In this case, the control unit 120 inputs, from the transport control device 430, predetermined information included in the transport control device 430 that drives and controls the transport mechanisms 410 and 420. And the control part 120 controls the 1st press mechanism part 230 and the 2nd press mechanism part 240 based on this input information. The control unit 120 controls the lowering and raising of the upper roll mechanism 231 of the first pressing mechanism 230 and the driving of the lower rolls 232-1 and 232-2.
Specifically, it is as follows.

(Lower control)
The control unit 120 controls the rotational speeds of the “lower V rolls” of the lower roll mechanisms 232 and 242 based on the test body size signal 121 and the transport speed signal 122 of the test body 400 received from the transport control device 430. . The “lower V roll” is because the rolls 232-1 and 232-2 of the lower roll mechanism 232 and the rolls 242-1 and 242-2 of the lower roll mechanism 242 are assumed to be V rolls. is there. The specimen size signal 121 and the conveyance speed signal 122 are examples of the “predetermined information”. As shown in FIG. 1, the lower rolls 232-1 and 232-2 and the rolls 242-1 and 242-2 are connected to the motor 290 via a coupler 291. The coupler 291 is a power transmission mechanism such as a chain, belt, or gear. The control unit 120 controls the driving of the lower roll 232-1 and the like through the rotation speed control of the motor 290.

(Upper control)
Further, the control unit 120 descends the upper roll mechanism 231 of the first pressing mechanism unit 230 and the upper roll mechanism 241 of the second pressing mechanism unit 240 based on the specimen passing signal 123 received from the transport control device 430. The controller 120 controls the rising timing. The “test body passage signal 123” is, for example, a signal that informs that the test body 400 reaches the first pressing mechanism 230. From this information and dimensional information such as the distance L23 between the first pressing mechanism 230 and the second pressing mechanism 240, the control unit 120 determines whether the upper roll mechanism 231 and the upper roll mechanism 241 are lowered. The timing of ascent can be controlled.

  Resistance and vibration when the test body 400 passes through the first pressing mechanism 230 and the second pressing mechanism 240 by the control of the control unit 120 with respect to the first pressing mechanism 230 and the second pressing mechanism 240. Can be greatly reduced. Therefore, the relative positional relationship between each probe and the test body can be maintained and secured.

  As shown in FIG. 2, an upper roll mechanism 231 that can be controlled to be raised and lowered by the control unit 120 is disposed on the upper side, and a lower roll mechanism 232 is disposed on the lower side. FIG. 2A shows a mechanism using a V roll, and FIG. 2B shows another mechanism. For the lower roll mechanism 232, V rolls whose rotational speed can be controlled by the control unit 120 are used as the lower rolls 232-1 and 232-2. Note that FIG. 2 shows a local nozzle 251 for a pressing mechanism which will be described later. The second pressing mechanism 240 has the same configuration.

(Local nozzle 251 for holding mechanism, etc.)
As shown in FIG. 1, the ultrasonic flaw detector 1000 includes a local nozzle 251 for a pressing mechanism. The local nozzles 251 and 252 for the pressing mechanism (first liquid ejecting unit) eject water toward the first pressing mechanism unit 230, and the local nozzles 261 and 262 for the pressing mechanism are applied to the second pressing mechanism unit 240. Inject water toward This has the effect of preventing the first pressing mechanism 230 or the second pressing mechanism 240 from trapping and stagnating bubbles, dust, etc. drawn into the water by the test body 400. The local nozzles 251 and 252 for the pressing mechanism inject water into the injection target range 265 where the first pressing mechanism unit 230 receives the tip of the test body 400. The local nozzles 261 and 262 for the pressing mechanism (second liquid ejecting unit) also have water in the ejection target range (a range equivalent to the ejection target range 265) in which the second pressing mechanism unit 240 receives the tip of the test body 400. Inject. In FIG. 1, the local nozzle for the pressing mechanism is arranged in each of the first pressing mechanism portion 230 and the second pressing mechanism portion 240, but at least by being arranged in the first pressing mechanism portion 230. effective. This is because air bubbles are drawn by the test body 400 near the entrance side packing 210 and more air bubbles float in the water than the exit side packing 220. It is more preferable to dispose the local nozzles 261 and 262 for the pressing mechanism in the second pressing mechanism 240 because the effect of removing bubbles, dust, and the like is further enhanced.

The control unit 120 injects water (for example, deaerated water) stored in the water supply tank 280 from the local nozzles 251, 252, 261, and 262 for the pressing mechanism through the control of the pump 292 and the electromagnetic valve 270. Control the water flow rate.
As shown in FIG. 1, FIG. 2, etc., the local nozzles 251 and 252 for the pressing mechanism inject water from below the injection target range 265 of the test body 400. The holding mechanism local nozzles 261 and 262 also eject water from below the injection target range of the test body 400 (a range equivalent to the injection target range 265).

  Further, the control unit 120 (injection control unit) determines the locality for the pressing mechanism based on the test body size signal 121, the transport speed signal 122, the test body passage signal 123, etc., which are “predetermined information” received from the transport control device 430. The flow rate of water sprayed by the nozzle 251 and the like is controlled. By this control, bubbles and dust can be effectively removed according to the size of the test body 400, the conveyance speed of the test body 400, and the like. That is, when the size of the test body 400 is large or when the conveyance speed is large, the flow rate can be increased to facilitate the removal of bubbles.

Embodiment 2. FIG.
An ultrasonic flaw detection apparatus 1000 according to the second embodiment will be described with reference to FIGS.
FIG. 3 is a diagram schematically showing the configuration of the ultrasonic flaw detector 1000 according to the second embodiment. The probes are sequentially called probes T1 to T4 in the transport direction 102.
FIG. 4 is a diagram conceptually showing the arrangement of the four probes T1 to T4 of the ultrasonic flaw detector 1000 according to the second embodiment as a perspective view.
As shown in FIG. 3, the second embodiment is characterized in that the probes T1 and T2 on the inlet side packing 210 (first pressing mechanism 230) side are arranged on the lower side, and the outlet side packing 220 (first This is that the probes T3 and T4 on the side of the second pressing mechanism 240 are arranged on the upper side. Note that the intervals L1 to L3 and the like in FIG. 4 are intervals between the probes in the transport direction 102 in FIG. 3 corresponds to “A-A” in FIG. 4 shown as a perspective view. 5 to 9 will be described later.

  First, features of the ultrasonic flaw detection apparatus 1000 according to the second embodiment will be described. In the ultrasonic flaw detection apparatus 1000 according to the second embodiment, the probes T1 and T2 arranged on the upstream side (the entrance side packing 210 side) in the transport direction 102 of the test body 400 (bar-shaped test body) are connected to the test body 400. Placed below. For this reason, when the test body 400 enters the water tank 200, the air bubbles 103 that frequently float near the entrance-side packing 210 of the water tank 200 always move upward (FIG. 6 described later), and therefore the probes T1 and T2 are the air bubbles 103. Will not be detected. Further, the probes T3 and T4 arranged above the test body 400 are arranged on the outlet side packing 220 side, which is a position where few bubbles are drawn when the test body 400 enters the water tank 200. For this reason, detection of the floating bubble 103 by the probe is greatly reduced, and erroneous determination due to detection of the bubble 103 can be improved. Hereinafter, the ultrasonic flaw detection apparatus 1000 will be described with reference to the drawings.

(Configuration of ultrasonic flaw detector 1000)
As shown in FIG. 3, the ultrasonic flaw detector 1000 according to the second embodiment includes four probes T1 to T4. Four are examples, and are determined according to the size of the test body 400 and the like. The probes T1 to T4 transmit ultrasonic waves to the test body 400 and detect echoes of the transmitted ultrasonic waves. Each of the probes T1 to T4 receives the echo transmitted by itself. Since the ultrasonic flaw detection apparatus 1000 according to the second embodiment is characterized by the arrangement of the probes, in FIG. 3, ultrasonic waves are transmitted to the probes T1 to T4 or received by the probes T1 to T4. The ultrasonic flaw detector main body for processing the echo is omitted.

(Test body 400)
Since the test body 400 is the same as that of Embodiment 1, description is abbreviate | omitted.

(Probe T1-T4)
In FIG. 3, the probes T1 to T4 are installed in the water of a water tank 200 (test tank) filled with water. This is to increase the transmission efficiency of ultrasonic waves. As shown in FIG. 4, the probes T1 to T4 (a plurality of probes) are sequentially arranged one by one in the conveyance direction 102 (passing direction) in which the test body 400 is directed from the entrance side packing 210 to the exit side packing 220. is set up. That is, as shown in FIG. 4, the probe T1 is installed at the AA cross-sectional position, the probe T2 is installed at the BB cross-sectional position, and the probe T3 is installed at the CC cross-sectional position. Is installed, and a probe T4 is installed at the DD cross-sectional position. Note that the conveyance direction 102 is also the direction of the track 106 as a matter of course. Among the four probes, a probe T1 (first probe) installed closest to the entrance-side packing 210 (test body entrance) in the transport direction 102 (passing direction) of the test body 400 in the water tank 200. The child) is installed “below the track 106” of the test body 400. Further, the probe T2 adjacent to the probe T1 (first probe) in the transport direction 102 (passing direction) is also installed “below the track 106” of the test body 400.

(Lower definition)
The “lower side” of “below the trajectory 106” is defined as follows. That is, the direction in which the bubbles 103 rise in the water tank 200 (described in FIG. 6) is the upper side, and the direction opposite to the direction in which the bubbles 103 rise is the lower side.

(Explanation of “below track 106”)
Continue to explain further. As described above, the probes T1 and T2 “below the trajectory 106” have the following meanings.
FIG. 5 is a diagram in which the positions of the probes are overlapped when the probes T1 to T4 in FIG. 3 are viewed in the transport direction 102 from the entrance side packing 210 side. The probes T1, T3, T4, and T2 are arranged in the clockwise direction in this order. In FIG. 5, the track 106 is indicated by a broken line. As shown in FIG. 5, the test body 400 passes through the water tank 200 without protruding from the track 106 indicated by a broken line when viewed in the direction of the conveyance direction 102 in FIG. 3. That is, the track 106 is a virtual path of the test body 400 in the water tank 200 where the test body 400 that passes through the water tank 200 does not protrude. More specifically, “lower side” means below the virtual horizontal line 107 in contact with the lowermost portion of the track 106 shown by a broken line shown in FIG. As shown in FIG. 5, the probes T <b> 1 and T <b> 2 are arranged below the virtual horizontal line 107. Similarly, “upper side” means above the virtual horizontal line 108 that is in contact with the uppermost portion of the track 106 indicated by a broken line. As shown in FIG. 5, the probes T1 to T4 are inclined approximately 45 degrees downward (probes T1 and T2) and approximately 45 degrees obliquely upward (probes T3 and T4). ).

(Echo detection range of probe T1 etc.)
With reference to FIG. 5, the detection range of the echo of the probe T1 and the like will be described. Probe T1 detects echoes in range D, probe T2 detects echoes in range c, probe T3 detects echoes in range i, and probe T4 detects echoes in range b To do.

  FIG. 6 is a diagram for explaining the effect of the arrangement of the probes T1 to T4. Since FIG. 6 is an explanation of the bubble 103, the first pressing mechanism 230 disposed in the water tank 200 is not shown. As shown in FIG. 6, when the test body 400 enters the water tank 200, the air bubbles 103 that frequently float in the entrance-side packing 210 (test body entrance portion) of the water tank 200 always move upward. Therefore, since the probes T1 and T2 are installed below the track 106, the bubble 103 is not detected. Probes T3 and T4, which are arranged above the test body 400 and detect echoes in the range A and range B, are arranged downstream of the probes T1 and T2 in the transport direction 102. That is, the test body 400 is arranged at a position (downstream side) where there are few bubbles 103 drawn when the test body 400 enters the water tank 200. For this reason, detection of the floating bubble 103 is greatly reduced, and erroneous determination due to detection of the bubble 103 can be improved.

(Probe holder 110)
The probe holder 110 to which the probe is attached will be described with reference to FIG. 3, FIG. 4, and FIG. As shown in FIG. 3, the probe holder 110 includes a base 111, columns 112-1 to 112-4, and probe mounting rods 113-1 to 113-4. FIG. 4 shows the structure of the probe holder 110 in a simplified manner. Four pillars 112-1 to 112-4 stand on the base 111, and the pillar 112-1 and the pillar 112-3 are connected to a probe mounting rod 113-1 and a probe mounting rod 113. -3 is connected. Further, the column 112-2 and the column 112-4 are connected to the probe mounting rod 113-2 and the probe mounting rod 113-4. Probes T1, T2, T3, and T4 are attached to the probe attachment rods 113-1 to 113-4, respectively. The above configuration is an example.

  FIG. 7 is a diagram showing another attachment configuration of the probe. FIG. 7A1 is a front view showing the probe mounting rod 113-5 for mounting the probes T1 and T2 arranged on the lower side of the track 106 (viewed in the transport direction 102 from the entrance side packing 210 side). Figure). FIG. 7A2 is a top view. FIG. 7B1 is a front view showing the probe attachment rod 113-6 for attaching the probes T3 and T4 arranged on the upper side of the track 106. FIG. FIG. 7 (b2) is a top view thereof. The configuration as shown in FIG. That is, the probe holder 110 has the probe T1 of each of the probes T1 to T4 at positions AA, BB, CC, and DD. Any configuration can be used as long as the position can be obtained.

(Upper probe group and Lower probe group)
In the above description, as shown in FIG. 3, the four probes T1 to T4 are formed from the two (plural) probes T1 and T2 installed below the track 106 of the test body 400. The lower probe group TG10 configured, and two probes T3 installed on the upper side of the track 106 of the specimen 400 in the transport direction 102 (passing direction) following the lower probe group TG10. , T4 and an upper probe group TG20. Therefore, it is possible to effectively suppress erroneous determination of the bubble detection result by the probe as a scratch on the specimen. As shown in FIG. 4, when the probes arranged in the transport direction 102 are sequentially designated as T1 to T4, and the positions on the same circumference are designated as P1 to P4, in FIG. The probes T1 and T2 of the side probe group TG10 are arranged. However, the probe T1 may be arranged at the position P4 and the probe T2 may be arranged at the position P1. Similarly, the probes T3 and T4 of the upper probe group TG20 are arranged at the positions P2 and P3. However, the probe T3 may be arranged at the position P3 and the probe T4 may be arranged at the position P2. . That is, the positions of the probes in the lower probe group TG10 may be interchanged, and the positions of the probes in the upper probe group TG20 may be interchanged. The same applies to FIG. 9 described later.

  In the above description, the case where the probe T1 (first probe) and the probe T2 (second probe) are arranged below the trajectory 106 of the test body 400 has been described. However, when the influence of the bubble 103 is small, as shown in FIG. 8, the probe T1 (first probe) is arranged below the track 106 of the test body 400, and the probe T2 is located on the upper side. It may be configured to be arranged in the above. One of the probe T3 and the probe T4 is on the lower side.

  In the above description, the case of four probes T1 to T4 has been described. However, for example, when eight probes are used as shown in FIG. 9, the probe group TG10 is used as the lower probe group TG10. The probes T1 to T4 may be arranged, and the probes T5 to T8 may be arranged as the upper probe group TG20. Such a configuration using many probes makes it possible to test a material having a large cross-sectional size.

Embodiment 3 FIG.
An ultrasonic flaw detector 1000 according to Embodiment 3 will be described with reference to FIGS.
FIG. 10 is a diagram schematically showing a configuration of the ultrasonic flaw detector 1000 according to the third embodiment.
The ultrasonic flaw detection apparatus 1000 according to Embodiment 3 is characterized in that the water chamber 1 is formed by the bubble removal cassette 160 and the water chamber 3 is formed by the water leakage prevention cassette 170 as follows.
In FIG. 10, a water chamber 1 to a water chamber 3 are formed compared to FIG. 1 of the first embodiment. In FIG. 10, illustration of the first pressing mechanism 230 and the second pressing mechanism 240 is omitted, but in actuality, the first pressing mechanism 230 is the nth bubble in the transport direction 102. The second pressing mechanism 240 is disposed between the removal cassette 160 and the probe holder 110 (a position indicated by a broken line), and the second holding mechanism 240 in the transport direction 102 is the first (leftmost) probe holder 110. The position shown with the broken line arrange | positioned between the water leak prevention cassettes 170). That is, the first pressing mechanism part 230 and the second pressing mechanism part 240 are disposed in the water of the water chamber 2.
In the ultrasonic flaw detector 1000 according to the third embodiment, as shown in FIG. 10, the water chamber 1 is formed by n (n is an integer of 2 or more) bubble removal cassettes 160, and m (m is 2 or more). A feature is that the water chamber 3 is formed by an integer) water leakage prevention cassette 170.
(2) The ultrasonic flaw detection apparatus 1000 is characterized in that it includes the probe water jet nozzles 131 and 132 (FIG. 14). Air bubbles floating in the water are forcibly pushed out of the “ultrasonic wave passing area” by the water jet nozzles 131 and 132 for the probe.

<Cassette>
In the ultrasonic flaw detector 1000 according to Embodiment 3, the water chamber 1 and the water chamber 3 are formed by a cassette described later, and the water chamber 2 between the water chamber 1 and the water chamber 3 is also formed. The water chamber 1 is divided into a plurality of rooms by a plurality of bubble removal cassettes 160 (described later). When the test body 400 passes through each of the bubble removal cassettes 160, the bubble removal cassette 160 peels off the bubbles 103 attached to the surface of the test body 400.
That is, when only the entrance side packing 210 is present, the air drawn into the water of the water tank 200 from the atmosphere at the surface of the test body 400 or the rear end of the test body 400 floats in the water as the bubbles 103. Then, as shown in FIG. 6 shown in the second embodiment, when the test body 400 enters from the entrance side packing 210 while the bubble 103 is floating, the bubble 103 moves upward. In this case, when the probe is arranged on the upper side like the probe T101 in FIG. 6, the bubbles are detected by ultrasonic waves, and the ultrasonic flaw detector may make an erroneous determination. Therefore, the bubbles 103 are removed by the bubble removal cassette 160. The water chamber 2 is a water chamber in which the probe T, the probe holder 110, and the like are arranged and performs ultrasonic flaw detection on the test body 400. The water chamber 3 is divided into a plurality of rooms by a plurality of water leakage prevention cassettes 170 (described later). Therefore, it can prevent that water leaks outside.

<Nozzle>
Further, a water injection nozzle was provided below the water chamber 2. With this water jet nozzle, bubbles in an ultrasonic passage area 266 described later are pushed out of the area. Therefore, it is possible to provide an ultrasonic flaw detector with few erroneous detections.

(Configuration of ultrasonic flaw detector 1000)
As shown in FIG. 10, the ultrasonic flaw detector 1000 includes a probe T disposed in the water of a water tank 200 (test tank), a plurality (n) of bubble removal cassettes 160 that generate the water chamber 1, and a water chamber. 3 controls the flow rate of water ejected by a plurality (m) of water leakage prevention cassettes 170, the probe water ejection nozzles 131 and 132 (liquid ejection section), and the probe water ejection nozzles 131 and 132. A control unit 120 (injection control unit) is provided. The control unit 120 controls the flow rate of water jetted from the water jet nozzles 131 and 132 for the probe through the water stored in the water supply tank 280 (for example, deaerated water) through the control of the pump 292 and the electromagnetic valve 270. To control. Deaerated water may also be used for the water 104 in the water tank 200.

(Test body 400)
In FIG. 10, a test body 400 (bar-shaped test body) is assumed to be a bar-shaped body that passes through the water in the water tank 200 (water chamber 1, water chamber 2, and water chamber 3) along a substantially linear track 106. The test body 400 is transported to a holding mechanism unit (not shown in FIG. 10), so that the test body 400 passes through the first bubble removal cassette 160 (test body entrance) serving as an entrance to the water chamber 1 in the atmosphere. The water tank 200 (water chamber 1) enters the water. The test body 400 is irradiated with ultrasonic waves by the probes T1 to T4 in the water chamber 2 while penetrating through the n bubble removal cassettes 160 forming the water chamber 1, and exits the water chamber 2 from the tip. The test body 400 passes through the m water leakage prevention cassettes 170 and passes through the m water leakage prevention cassette 170 (test body outlet), which is the test body outlet, from the water (water chamber 2) to the atmosphere. Go out. Note that the test body 400 has a length of about 3 m to 6 m and a diameter φd of about 18 mm to 120 mm, for example. However, this dimension is an example. The test body 400 has a circular, rectangular, or polygonal cross section, but is not particularly limited. In the ultrasonic flaw detector 1000 of FIG. 10, the test body 400 having a length of about 3 m to 6 m as described above is carried into the water tank 200 at intervals of about 0.5 seconds.

(Probe)
The plurality of probes T1 to T4 in FIG. 10 transmit ultrasonic waves to the test body 400 and detect echoes of the transmitted ultrasonic waves. The probe T1 and the like are sequentially transferred in the transport direction 102 (passing direction) in which the test body 400 is directed from the test body entrance (first bubble removal cassette 160) to the m-th water leakage prevention cassette 170 (test body exit). One by one is installed in the water.

(Bubble removal cassette 160)
With reference to FIGS. 11-13, the bubble removal cassette 160 (entrance side packing part) which forms the water chamber 1 is demonstrated. The bubble removal cassette 160 includes an ultrasonic wave passing area 266 through which an ultrasonic wave transmitted by the probe T toward the test body 400 and an echo of the transmitted ultrasonic wave pass, and a test object entrance (first N bubbles including the first bubble removing cassette 160 are arranged between the first bubble removing cassette 160 and the first bubble removing cassette 160. The number of the bubble removal cassette 160 and the water leakage prevention cassette 170 is n and m, respectively, but may be any of n = m, n> m, and n <m.
FIG. 11 is a view showing the appearance of the bubble removal cassette 160. Fig.11 (a) is a side view, FIG.11 (b) is a front view (Z direction arrow view of (a)). As shown in FIG. 11, the bubble removal cassette 160 includes an attachment base 161 (partition), an opening forming packing 140, and a slit forming packing 150.

(Opening packing 140)
FIG. 12 is a view showing the opening forming packing 140. The opening forming packing 140 includes a packing mounting portion 141 and an opening forming packing body 142. An opening forming packing body 142 is attached to the packing attaching portion 141. An opening 143 is formed in the opening forming packing body 142. The opening 143 is an opening through which the test object 400 to be applied passes and is slightly smaller than the cross section of the test object 400. Since the opening 143 is slightly smaller than the dimension (cross-sectional shape) of the test body 400 in this way, the surface of the test body 400 is rubbed by the edge of the opening 143, so that the effect of removing bubbles is great. That is, in the water chamber 1, the room partitioned by each bubble removal cassette 160 is filled with water. The bubbles removed by the opening 143 float in the water. In addition, since each chamber is partitioned by each bubble removal cassette 160, the bubbles on the surface of the test specimen 400 that have been removed in that room are difficult to leak into the next room. There is an effect.

(Slit forming packing 150)
FIG. 13 is a view showing the slit forming packing 150. The slit forming packing 150 includes a packing mounting portion 151 and a slit forming packing main body 152. In the slit forming packing main body 152, radial slits 153 for allowing the test body 400 to pass therethrough are formed. The slit 153 has a function of allowing the test body 400 to pass while suppressing water leakage. As described above, the slit-forming packing body 152 provided with the slits 153 radially has an effect of reducing the leakage of water filled in the water chamber 2.

(Mounting base 161)
As shown in FIG. 11, the opening formation packing 140 and the slit formation packing 150 are attached to the attachment base 161. The mounting base 161 has its outer edge 161-1 (FIG. 11B) in close contact with the inside of the water tank 200, so that the water in the water tank 200 (water chamber 1) is placed on the ultrasonic wave passing area 266 side and the specimen entrance ( It is a partition part which partitions off into the 1st bubble removal cassette 160) side. In the case of the bubble removal cassette 160, the bubbles 103 on the surface of the test body 400 can be removed by the opening 143 even when the outer edge 161-1 of the mounting base is not in close contact with the inside of the water tank 200. That is not essential.

  In FIG. 11, the bubble removing cassette 160 includes the opening forming packing 140 and the slit forming packing 150. However, the bubble removing cassette 160 may include only the opening forming packing 140 except for the specimen entrance (first bubble removing cassette 160). I do not care. That is, the bubble removal cassette 160 is a cassette provided with at least the opening forming packing 140. Further, the specimen entrance may be a water leak prevention cassette 170 described later, instead of the first bubble removal cassette 160. For example, in the simplest configuration, a water leakage prevention cassette 170 described later is used at the specimen entrance, and at least 1 cassette is arranged between the specimen entrance and the ultrasonic passage area 266 in the transport direction 102. A configuration using two bubble removal cassettes 160 (if the opening forming packing 140 is provided, the slit forming packing 150 may not be provided) may be employed.

(Water leakage prevention cassette 170)
The water leak prevention cassette 170 (exit side packing part) which forms the water chamber 3 is demonstrated. There are m water leakage prevention cassettes 170 including the water leakage prevention cassette 170 itself at the specimen outlet between the ultrasonic wave passage area 266 and the specimen outlet (the m-th water leakage prevention cassette 170). m is an integer of 2 or more). The water leakage prevention cassette 170 refers to a cassette provided with at least the slit forming packing 150 in the bubble removal cassette 160 of FIG. Although the water leakage prevention cassette 170 may be provided with the opening forming packing 140, the water leakage prevention cassette 170 is disposed after the test body 400 leaves the water chamber 2 having the ultrasonic wave passage area 266. Yes, there is no merit of removing bubbles. In addition, when attaching the slit formation packing 150 to the bubble removal cassette 160, there exists an effect of water leak reduction.

  The bubble removal cassette 160 and the water leakage prevention cassette 170 can be inserted into and removed from the water tank 200. Therefore, the number of attachments to the water tank 200 can be adjusted.

(Applicable size identification slit)
As shown in FIG. 11, a slit groove 162 is provided at one end of a mounting base 161 of a plurality of bubble removal cassettes 160 (cassettes having an opening forming packing 140) that form the water chamber 1. That is, the slit grooves 162 are formed in substantially the same place in the plurality of bubble removal cassettes 160 (the mounting base 161) and the water leakage prevention cassette 170 (the mounting base 161) forming the water chamber 1. The slit groove 162 is an identification unit for identifying the size of the test body 400 to which the bubble removal cassette 160 can be applied. For example, the slit groove 162 in FIG. 11 is a case where the bubble removing cassette 160 is applicable to a round bar having a diameter of φ20 to φ30 when the test body 400 is a round bar. When the bubble removing cassette 160 is applicable to different material diameters, for example, φ50 to φ70, the slit groove 162 is formed below the position of FIG. For example, it is like a slit groove 162-1 indicated by a broken line in FIG. When a plurality of bubble removal cassettes 160 are installed, the slit grooves 162 are aligned in the transport direction 102. Therefore, the slit groove 162 (position of the slit groove 162) can be detected by a photoelectric sensor (not shown) with the plurality of bubble removal cassettes 160 attached to the water chamber 1 (water tank 200). Thereby, the applicable material diameter can be determined. That is, in the transport direction 102, a light projecting part such as a laser is placed on the front side (the direction opposite to the arrow indicating the transport direction 102) from the test body entrance (first bubble removing cassette 160), and the test body exit A light receiving sensor is arranged closer to the conveyance direction 102 than the (m-th water leakage prevention cassette 170).

(Water spray nozzles 131 and 132 for the probe)
14 is a cross-sectional view taken along the line AA in FIG. This will be described with reference to FIG. FIG. 14 shows an ultrasonic wave passage area 266-2 corresponding to the probes T1 and T2 arranged on the lower side in the second embodiment, and probes T3 and T4 arranged on the upper side in the second embodiment. The ultrasonic wave passage area 266-1 corresponding to is shown. The ultrasonic wave passage area 266 shown in FIG. 10 is the ultrasonic wave passage area 266-1. As shown in FIG. 10, the ultrasonic flaw detection apparatus 1000 includes probe water jet nozzles 131 and 132 (liquid jet parts) below the water chamber 2 and below the ultrasonic wave passing area 266. I have. The water jet nozzles 131 and 132 for the probe jet water around the ultrasonic passage area 266-1 (FIG. 14) (the same applies to the ultrasonic passage area 266-2). As shown in FIGS. 10 and 14, the water jet nozzles 131 and 132 for the probe are water around the ultrasonic passage area 266-1 from the lower side to the ultrasonic passage area 266-1 and obliquely upward. (The same applies to the ultrasonic passage area 266-2). FIG. 15 is a diagram for explaining the shapes of the water jet nozzles 131 and 132 for the probe. In (a), the water jet nozzle 131 for the probe and the water flow 132-1 are shown. (B) shows the water jet nozzles 131 and 132 for the probe. 15 is a view in the direction of the arrow X in FIG. 14, but is drawn in a perspective view for easy understanding. The tips of the water jet nozzles 131 and 132 for the probe have a flat tube shape as shown in FIG. 15, and the transport direction 102 is the longitudinal direction of the flat shape.
Note that, as in the second embodiment, water is jetted around the sound wave passage area 266-2 (FIG. 15) in the probe T (probes T1 and T2 in FIG. 3) arranged on the lower side. In this case, a probe water jet nozzle for the sound wave passage area 266-2 is provided. In this case, the probe water injection nozzles 131 and 132 shown in FIG. 10 are arranged in the transport direction 102 with the probe water injection nozzles for the lower probes T1 and T2 and the upper probe T3. , T4 may be divided into a probe water jet nozzle.

(Water ejection mechanism)
The water ejection mechanism of FIG. 10 that ejects water around the ultrasonic wave passing area 266 will be described.
The water ejection mechanism includes probe water ejection nozzles 131 and 132, a control unit 120, a water supply tank 280, a pump 292, and an electromagnetic valve 270.
As shown in FIG. 10, the control unit 120 (injection control unit) controls water stored in the water supply tank 280 (for example, deaerated water) by controlling the number of revolutions of the pump 292 and opening / closing the electromagnetic valve 270. The flow rate of the water jetted by the probe water jet nozzle 131 is controlled via. That is, as shown in FIG. 10, the probe water injection nozzles 131 and 132 and the pump 292 arranged in the water supply tank 280 are connected by the pipe 281. An electromagnetic valve 270 is disposed in the middle of the pipe 281. In this water ejection mechanism, the control unit 120 controls the flow rate ejected from the probe water ejection nozzles 131 and 132 by controlling the pump 292 and the electromagnetic valve 270. The control unit 120 appropriately controls the flow velocity of the probe water jet nozzle 131, for example, “according to the size of the test body 400”. Alternatively, the “control according to the conveyance speed of the test body 400” may be performed. Information on the size and transport speed of the test body 400 may be input by the control unit 120 from an external control device.

  By controlling the flow velocity by the control unit 120, bubbles that exist between the probes T1 to T4 test body 400 in the water chamber 2 and float in the water can be forcibly pushed out of the ultrasonic wave passage area 266. Therefore, it is possible to provide an ultrasonic flaw detector with few false detections.

  Of course, the embodiments described above may be combined with each other. That is, any two embodiments may be combined, or three of the first to third embodiments may be combined.

  T1, T2, T3, T4, T5, T6, T7, T8, T101 probe, TG10 lower probe group, TG20 upper probe group, 101 virtual cylinder, 102 transport direction, 103 bubbles, 104 water, 106 trajectory, 107, 108 virtual horizon, 110 probe holder, 111 base, 112-1, 112-2, 112-3, 112-4 pillar, 113-1, 113-2, 113-3, 113 -4, 113-5, 113-6 Probe mounting rod, 120 control unit, 121 specimen size signal, 122 transport speed signal, 123 specimen passage signal, 131, 132 water jet nozzle for probe, 132- DESCRIPTION OF SYMBOLS 1 Water flow, 140 opening formation packing, 141 packing attachment part, 142 opening formation packing main body, 143 opening, 150 slit formation packing 151 packing mounting part, 152 slit forming packing body, 153 slit, 160 bubble removal cassette, 161 mounting base, 161-1 outer edge, 162 slit groove, 170 water leakage prevention cassette, 200 water tank, 210 inlet side packing, 220 outlet side packing , 230 First pressing mechanism, 231 Upper roll mechanism, 232 Lower roll mechanism, 231-1, 231-2 roll, 232-1, 232-2 roll, 240 Second pressing mechanism section, 241 Upper roll mechanism 241-1, 241-2 roll, 242 Lower roll mechanism, 242-1, 242-2 roll, 251, 252, 261, 262 Local nozzle for pressing mechanism, 265 Target area for injection, 266 Ultrasonic passage area, 270 Solenoid valve, 280 Water supply tank, 281 Pipe, 290 motor, 291 coupler, 292 pump, 310 inlet side holding mechanism, 311 upper side roll mechanism, 312 lower side roll mechanism, 320 outlet side holding mechanism part, 321 upper side roll mechanism, 322 lower side roll mechanism, 400 test Body, 410, 420 transport mechanism, 430 transport control device, 1000 ultrasonic flaw detector.

Claims (6)

A rod-shaped body that passes through the liquid in the test tank filled with the liquid in a substantially linear path, enters the liquid from the atmosphere through the test body entrance formed in the test tank, and enters the test tank. An ultrasonic flaw detection apparatus for ultrasonic flaw detection of a rod-shaped test body, which is a rod-shaped body that exits from the liquid to the atmosphere via the formed test body outlet,
Ultrasonic waves are transmitted to the rod-shaped specimen, and echoes of the transmitted ultrasonic waves are detected, and the rod-shaped specimen is sequentially placed in the liquid in the passing direction from the specimen entrance to the specimen outlet. With multiple probes installed in
Among the plurality of probes, the liquid in the test tank is placed on the side of the test body entrance immediately before the first probe which is the probe installed closest to the test body entrance in the passing direction. A first test body pressing mechanism that is installed inside and receives the tip of the bar-shaped test body that has entered through the entrance of the test body, and feeds it in the passing direction while pressing the bar-shaped test body;
Among the plurality of probes, in the liquid in the test tank immediately after the last probe, which is the probe installed closest to the specimen outlet in the passing direction, on the specimen outlet side. The tip of the rod-shaped test body sent out by the first test body pressing mechanism is received and sent out from the liquid to the atmosphere through the test body outlet while pressing the rod-shaped test body. An ultrasonic flaw detector comprising a second specimen holding mechanism part. The rod-shaped specimen is
It is transported by a transport mechanism that is driven and controlled by a transport control device, and enters the liquid from the atmosphere through the specimen entrance,
The ultrasonic flaw detector further comprises:
Predetermined information possessed by the transport control device is input from the transport control device, and the first test body pressing mechanism portion and the second test body pressing mechanism portion are controlled based on the input predetermined information. The ultrasonic flaw detector according to claim 1, further comprising a pressing control unit. The ultrasonic flaw detector further comprises:
3. The supermarket according to claim 1, wherein the first specimen holding mechanism section includes a first liquid ejecting section that ejects a liquid around a position where the tip end of the rod-shaped specimen is received. Sonic flaw detector. The ultrasonic flaw detector further comprises:
4. The ultrasonic flaw detector according to claim 3, further comprising a second liquid ejecting section that ejects liquid around the second test body pressing mechanism section that receives the tip of the rod-shaped test body. The liquid ejecting unit is
5. The ultrasonic flaw detector according to claim 3, wherein the liquid is ejected from below the vicinity of receiving the tip of the rod-shaped test body. The ultrasonic flaw detector further comprises:
The ultrasonic flaw detector according to any one of claims 3 to 5, further comprising an ejection control unit that controls a flow rate of the liquid ejected by the liquid ejection unit.

Images