JP2008008827A - Ultrasonic probe and ultrasonic flaw detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic flaw detection device which stably inspects the whole of a bolt shaft only by applying a probe to the head of a bolt. <P>SOLUTION: The ultrasonic flaw detection device 100 is equipped with a composite probe 12 having: a vertical vibrator 10; and a plurality of oblique angle vibrators 11 to detect the echo (specific part echo data) from the specific region of a bolt 1 through the composite probe 12, and judges whether the echo detected by the vertical vibrator 10 itself or the echoes (referred to as detection echo data) detected by the oblique angle vibrators 11 are employed as data on the basis of the comparison result of the echo height of the specific part echo data obtained by the vertical vibrator 10 with a preliminarily stored reference value. Alternatively, the ultrasonic flaw detection device 100 calculates the correction quantity of the detected echo data on the basis of the comparison result of the echo height of the specific part echo data with the preliminarily stored reference value to correct the detected echo data. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an ultrasonic flaw detector that inspects whether or not a bolt has a defect using ultrasonic waves, and an ultrasonic probe used in the ultrasonic flaw detector.

  FIG. 11 shows a conventional example. As shown in FIG. 11, only the vertical vibrator 10 is incorporated in the conventional ultrasonic probe 50 for bolts. For this reason, when the vertical vibrator 10 emits the vertical ultrasonic beam 6, an “unreachable region 51” where the ultrasonic wave does not reach is generated as shown in FIG. 11, and the “unreachable region 51” is defective. There is a problem that it cannot be detected when there is.

  FIG. 12 shows another conventional example (for example, Non-Patent Document 1). In FIG. 12, the oblique transducer 11 is incorporated into the ultrasonic probe 50. By incorporating the oblique transducer 11 into the ultrasonic probe 50, the oblique ultrasonic beam 7 reaches the “unreachable region 51” shown in FIG. 11, and a defect existing in this region can be detected. Is possible. However, in order to inspect the vicinity of the entire surface of the “unreachable region 51” shown in FIG. 11, it is necessary to rotate the ultrasonic probe 50 incorporating the oblique vibrator 11 around the bolt axis. was there.

Moreover, since the inspection data is influenced by the contact state between the ultrasonic probe 50 and the bolt head upper surface 2a as a problem of the ultrasonic flaw detector itself, the ultrasonic probe 50 and the bolt head upper surface 2a There was a problem that careful attention had to be paid to the contact situation.
“Inspection of fatigue cracks and delayed cracks in bolts” [online], [searched on February 20, 2006], Nippon Steel Techno-Research Co., Ltd., Internet <http: // www. nstr. co. jp / boluto. htm>

  The present invention provides a bolt ultrasonic inspection device that can be applied to inspection of bolts by simple means, and in particular can inspect the entire bolt shaft only by applying an ultrasonic probe to the head of the bolt. The purpose is to do.

  It is another object of the present invention to provide an ultrasonic flaw detector for a bolt that enables a stable inspection that is not affected by the contact state between the ultrasonic probe and the upper surface of the bolt head.

The ultrasonic probe of the present invention is
In an ultrasonic probe that is mounted on the upper surface of the head of a bolt composed of a head and a shaft and emits an ultrasonic wave toward the shaft, and detects an echo of the emitted ultrasonic wave,
A vertical vibrator that emits ultrasonic waves in substantially the same direction as the axial direction of the shaft portion, and detects echoes of the emitted ultrasonic waves;
And a plurality of oblique vibrators that emit ultrasonic waves in a predetermined direction different from the axial direction of the shaft portion and detect echoes of the emitted ultrasonic waves.

The plurality of oblique angle vibrators are:
The vertical vibrator is arranged so as to surround the vertical vibrator.

The ultrasonic probe further includes:
A magnet is provided.

The ultrasonic flaw detector of the present invention is
Specific part echo data storage for storing specific part echo data that is data corresponding to an echo from a specific part, which is a specific part of the bolt, caused by the ultrasonic wave emitted by the vertical transducer of the ultrasonic probe And
A detection echo data storage unit that stores detection echo data that is data corresponding to an echo detected by at least one of the oblique angle transducer and the vertical transducer;
A command signal for comparing the specific part echo data stored in the specific part echo data storage unit with a preset reference value, and generating and outputting a command signal for instructing execution of a predetermined process based on the comparison result An output section;
A command execution unit configured to input a command signal output from the command signal output unit and execute predetermined processing on the detected echo data stored in the detected echo data storage unit in accordance with the input command signal; And

The command signal output unit is
A process of comparing the specific part echo data stored in the specific part echo data storage unit with a preset reference value and validating the detected echo data stored in the detection echo data storage unit based on the comparison result. Generate and output either a valid command signal for commanding execution or an invalid command signal for commanding invalidation,
The process execution unit
When the valid command signal is input, the detection echo data stored in the detection echo data storage unit is validated. When the invalid command signal is input, the detection echo data stored in the detection echo data storage unit is invalidated. It is characterized by that.

The command signal output unit is
The specific part echo data stored in the specific part echo data storage unit is compared with a preset reference value, and based on the comparison result, the correction processing of the detected echo data stored in the detected echo data storage unit is commanded. Generate and output a correction command signal,
The process execution unit
When a correction command signal is input, the detected echo data stored in the detected echo data storage unit is corrected.

  According to the present invention, it is possible to provide an ultrasonic flaw detection apparatus for a bolt that can stably inspect the entire bolt shaft only by applying a probe to the head of the bolt.

  Embodiments 1 and 2 below relate to a probe that irradiates ultrasonic waves onto a bolt that is a test body and an ultrasonic flaw detection apparatus that performs ultrasonic flaw detection.

Embodiment 1 FIG.
The first embodiment will be described with reference to FIGS. The first embodiment relates to a composite probe that is used for ultrasonic testing of bolts and includes a vertical vibrator and a plurality of oblique vibrators.

  FIG. 1 shows an ultrasonic flaw detector 100 in which the “compound probe 12 of the first embodiment” is used. The ultrasonic flaw detector 100 includes a flaw detector main body 15, a switching unit 14, and a composite probe 12. The switching unit 14 and the composite probe 12 are connected by a connection cable 13.

The flaw detector main body 15 includes a transmission / reception unit 16, an amplification unit 17, a data processing unit 19, a control unit 26, and an output unit 20.
(1) The transmission / reception unit 16 gives a transmission pulse to each transducer and receives an ultrasonic echo signal (also referred to as echo data) detected by the vertical transducer 10 or the oblique angle transducer 11.
(2) The amplifying unit 17 amplifies the received signal.
(3) The data processing unit 19 processes data.
(4) The control unit 26 controls the switching unit 14, the transmission / reception unit 16, and the data processing unit 19.
(5) The output unit 20 outputs the processing result to the outside.
The control unit 26 and the data processing unit 19 constitute a data processing block 18.

  As shown in FIG. 1, the composite probe 12 is attached to the bolt head upper surface 2 a of the bolt 1. As shown in FIG. 1, the “bolt head upper surface 2a” is the upper surface of the bolt head. Normally, when the composite probe 12 is mounted on the bolt head upper surface 2a, for example, a jelly-like contact medium 5 is applied to the bolt head upper surface 2a.

Before describing the details of the composite probe 12, an outline of the operation of the ultrasonic flaw detector 100 will be described with reference to FIG. FIG. 2 is a diagram showing the configuration of the composite probe 12. FIG. 2 shows a composite probe 12 including one vertical vibrator (No. 9) and eight oblique vibrators (No. 1 to No. 8), but this is an example. is there. The number of vertical vibrators and oblique vibrators is not limited. In the composite probe 12, a plurality of oblique transducers may be arranged around the vertical transducer so as to surround the vertical transducer. For example, the composite probe 12 may be configured to include one vertical vibrator and twelve oblique angle vibrators. Hereinafter, a case where the composite probe 12 includes one vertical vibrator (No. 9) and eight oblique angle vibrators (No. 1 to No. 8) will be described as an example. A detailed description of the composite probe 12 according to FIG. 2 will be given later.
(1) The control unit 26 switches to any one of the terminals 1 to 9 of the switching unit 14. As shown in FIG. 2 described later, the composite probe 12 includes nine transducers, and the terminals 1 to 9 correspond to the respective transducers (No. 1 to No. 9). No. 1-No. Reference numeral 8 denotes the oblique angle vibrator 11. Reference numeral 9 denotes a vertical vibrator 10. After switching to one of the terminals of the switching unit 14, the control unit 26 causes the transmission / reception unit 16 to transmit a transmission pulse. The corresponding transducer emits ultrasonic waves by this transmission pulse.
(2) The transducer that emits the ultrasonic wave detects the echo of the ultrasonic wave that it has emitted. This echo is converted into a detection signal (sometimes referred to as echo data) by the vibrator and received by the transmission / reception unit 16.
(3) The transmission / reception unit 16 outputs the detection signal to the amplification unit 17.
(4) The data processing unit 19 processes the detection signal (echo data) amplified by the amplification unit 17.
(5) The output unit 20 outputs the data processed by the data processing unit 19 to another device.

The configuration of the composite probe 12 will be described in detail with reference to FIG. As shown in FIG. 2, the composite probe 12 includes a vertical vibrator 10 (No. 9) and a plurality of oblique vibrators 11 (No. 1 to No. 8) capable of transmitting and receiving ultrasonic waves. I have.
(1) The “vertical vibrator 10” emits a vertical ultrasonic beam 6 in a direction substantially the same as the axial direction of the trunk portion 3 (shaft portion) of the bolt 1 as shown in FIG. Detect echoes.
(2) The “bevel transducer 11” emits an oblique ultrasonic beam 7 in a predetermined direction different from the axial direction of the trunk 3 (shaft), and detects an echo of the emitted oblique ultrasonic beam 7. Here, “vertical” means that the direction in which the ultrasonic beam of the vibrator emits is the axial direction of the bolt 1. Further, “bevel angle” means that the direction in which the ultrasonic beam of the vibrator emits forms an angle with the axial direction of the bolt 1.

  As shown in the plan view of FIG. 2 (b), in the composite probe 12, the vertical vibrator 10 is arranged at the center, and a plurality of oblique vibrators 11 place the vertical vibrator 10 around the vertical vibrator 10. It is arranged to surround.

  Further, as shown in FIGS. 2A and 2B, the vertical vibrator 10 and the plurality of oblique vibrators 11 are housed in the same case 30 and integrated as a composite probe 12. It is configured.

  As described above, as shown in FIG. 2, the composite probe 12 of the first embodiment includes the vertical vibrator 10 and the plurality of oblique vibrators 11. Therefore, as shown in FIG. 1, the entire interior of the bolt shaft including the surface is obtained by the vertical ultrasonic beam 6 of the vertical vibrator 10 and the oblique ultrasonic beam 7 by each of the plurality of oblique vibrators 11. Can be inspected. That is, the problem of the “unreachable area 51” shown in FIG. 11 can be solved, and the trouble of rotating the probe becomes unnecessary as described in FIG.

  3 and 4 are diagrams showing a configuration in which the composite probe 12 further includes a magnet 9. FIG. 3 shows a state in which the compound probe 12 is mounted on the bolt head upper surface 2a. FIG. 4 shows a configuration of the composite probe 12 including the contact material ring 8 in which the magnet 9 is incorporated. As shown in FIG. 4, the composite probe 12 includes a case 30 in which one vertical vibrator 10 and eight oblique vibrators 11 are housed, and a ring for contact material in which a magnet 9 is incorporated. 8 and. As shown in FIG. 4, the case 30 has a cylindrical shape. The inner diameter side of the contact material ring 8 is fixed to the outer diameter side of the case 30. The ring for contact material 8 is attached in the vicinity of the bottom surface side on the side in contact with the bolt head upper surface 2a in the cylindrical case 30. In this manner, by providing the contact material ring 8 on the outer periphery of the case 30 and using the magnet for the entire contact material ring 8 or a part thereof, it is not necessary to press the case 30 from the outside. For example, the composite probe 12 can be fixedly attached to the bolt head upper surface 2a without a person holding the composite probe 12 by hand.

  Since the composite probe 12 according to the first embodiment includes the vertical transducer 10 and the plurality of oblique transducers 11, the “unreachable region” of the ultrasonic wave shown in FIG. 11 can be eliminated. In addition, since a plurality of oblique angle transducers are provided, there is no need to rotate the composite probe 12 around the bolt axis. For this reason, in the ultrasonic flaw detection test of the bolt, it is not necessary to move the composite probe 12 after the composite probe 12 is mounted, and the working efficiency is improved.

  Since the composite probe 12 according to the first embodiment includes a magnet, it is not necessary to hold down the composite probe 12 when the composite probe 12 is mounted on the upper surface of the bolt head. For this reason, the work efficiency of the ultrasonic flaw detection inspection of a bolt improves.

Embodiment 2. FIG.
The second embodiment will be described with reference to FIGS. The second embodiment relates to an ultrasonic flaw detector 100 including the composite probe 12 described in the first embodiment in FIG. The configuration of the ultrasonic flaw detector 100 of the second embodiment is as shown in FIG.

The outline of the ultrasonic flaw detector 100 described in the second embodiment is as follows.
(1) The ultrasonic flaw detector 100 includes a composite probe 12 including a vertical vibrator 10 and a plurality of oblique vibrators 11 capable of transmitting and receiving ultrasonic waves.
(2) By simply bringing the composite probe 12 into contact with the bolt head upper surface 2 a of the bolt 1, the composite probe 12 detects a reflected wave from a defect present in each part of the bolt 1.
(3) When detecting the reflected wave, the ultrasonic flaw detector 100 emits an ultrasonic wave from the vertical vibrator 10 of the composite probe 12 and the vertical vibrator 10 detects an echo of the emitted ultrasonic wave. Then, an echo (specific part echo data) from a specific part of bolt 1 (hereinafter sometimes referred to as a specific part) is detected. Since the sensitivity of the ultrasonic wave greatly depends on the condition of the contact medium and the surface property of the test specimen, in the ultrasonic flaw detector 100 according to Embodiment 2, the specific part echo from the specific part obtained by the vertical vibrator 10 The echo height of the data is compared with a reference value stored in advance. Based on the comparison result, the ultrasonic flaw detector 100 determines data processing of the echo detected by the vertical vibrator 10 or the echo detected by the oblique vibrator 11. For example, the ultrasonic flaw detector 100 determines whether or not to use the detected echo as data based on the comparison result between the echo height of the specific portion echo data and the reference value. Alternatively, the ultrasonic flaw detector 100 determines a correction amount for correcting the detected echo data based on the comparison result between the echo height of the specific portion echo data and the reference value, and executes the correction process.
(4) As described above, the ultrasonic flaw detection apparatus 100 according to the second embodiment stores the specific portion echo data corresponding to the echo from the specific portion caused by the ultrasonic wave generated by the vertical vibrator 10, and stores this memory. The specific part echo data is compared with a preset reference value, and based on the comparison result, a predetermined process (whether the detected data is adopted or not is used for the data detected by the vertical vibrator 10 and the oblique vibrator 11). And a correction process for correcting the detected data). By such processing, the ultrasonic flaw detection inspection of the bolt can be performed with stable performance. In the following embodiments, data acceptance / rejection will be described first, and then data correction will be described.

  The data acceptance / rejection process will be described with reference to FIG. FIG. 5 is a block diagram showing an internal configuration of the data processing unit 19 of the ultrasonic flaw detector 100 described in the second embodiment.

  As shown in FIG. 5, the data processing unit 19 includes a first storage unit 21S (specific part echo data storage unit), a second storage unit 21H (detected echo data storage unit), a comparison unit 22 (command signal output unit), The determination part 23 (process execution part) is provided. The first storage unit 21S and the comparison unit 22 constitute a specific side processing unit 19S, and the second storage unit 21H and the determination unit 23 constitute a detection side processing unit 19H.

The operation of the data processing unit 19 in FIG. 5 will be described with reference to FIGS.
FIG. 6 is a flowchart showing the operation of the data processing unit 19 shown in FIG.
FIG. 7 shows an output echo waveform of the vertical vibrator 10 provided in the composite probe 12.
FIG. 8 shows an output echo waveform of the oblique transducer 11 provided in the composite probe 12.

First, FIG. 7 will be described.
In FIG. 7, the horizontal axis represents time. The vertical axis represents the echo height when the vertical vibrator 10 itself detects the echo of the ultrasonic wave emitted by the vertical vibrator 10.
Each symbol indicates the following.
That is,
TH: Transmission pulse,
S1: Echo from bolt head upper surface 2a,
F1: Defect portion echo (detected echo data) from a certain defect portion,
F1-1: defective part echo (detected echo data) from a defective part different from the defective part of F1,
FE1: Echo height of defect part echo F1,
B: Back echo (specific part echo data),
BE: Back echo height,
JL: indicates a reference value.

Next, FIG. 8 will be described.
In FIG. 8, the horizontal axis indicates time. The vertical axis indicates the height of an echo when the oblique vibrator 11 itself detects an ultrasonic echo emitted from the oblique vibrator 11 by paying attention to a certain oblique vibrator 11.
Each symbol indicates the following.
That is,
TS: Transmit pulse,
S2: Echo from bolt head upper surface 2a,
F2: defective part echo (detected echo data) from a certain defective part,
FE2: Echo height of the defect part echo F2,
Is shown.

  In FIG. 7 and FIG. 8, the time t2 is larger than the time t1 because the distance to the bolt head upper surface 2 a is farther from the oblique vibrator 11 than from the vertical vibrator 10.

  The operation of the data processing unit 19 in FIG. 5 will be described with reference to the flowchart in FIG.

  In S101, the first storage unit 21S inputs and stores the back echo B (specific unit echo data) shown in FIG. The back echo B is specific portion echo data corresponding to an echo from the specific portion of the bolt 1 caused by the ultrasonic wave emitted by the vertical vibrator 10. As the specific portion echo data, a suitable piece of data detected by the vertical vibrator 10 may be adopted.

  In S102, the second storage unit 21H (detected echo data storage unit) detects detected echo data that is data corresponding to an echo detected by at least one of the plurality of oblique angle transducers 11 and the vertical transducer 10. Remember. That is, No. 1 shown in FIG. 1-No. The detected echo data which is data corresponding to the echo detected by any of 9 is stored. The second storage unit 21H is No. 1-No. Data detected by all of the nine transducers can be stored. In FIG. 7, the defect part echoes F1 and F1-1 are both detected echo data. In FIG. 8, the defect portion echo F2 is detected echo data. The second storage unit 21H stores defect echoes F1, F1-1, F2, and the like, which are detected echo data.

  In S103, the comparison unit 22 (command signal output unit) compares the back echo B (specific unit echo data) stored in the first storage unit 21S with a preset reference value JL. The image is shown in FIG. The comparison unit 22 (command signal output unit) compares, for example, the back echo B (specific unit echo data) stored in the first storage unit 21S and the reference value JL (sent from the control unit 26). As a comparison method, for example, the comparison unit 22 (command signal output unit) compares the “back echo height BE” of the back echo B with the reference value JL as shown in FIG. Based on the comparison result, the comparison unit 22 instructs the execution of the process for validating the detected echo data stored in the second storage unit 21H and the “invalid command signal JS” for instructing the invalidation process. One of the “signal JS” is generated and output. As a specific example, the comparison unit 22 generates and outputs an invalid command signal JS when the “back echo height BE” is less than 70% of the reference value JL, and the valid command signal JS when 70% or more. Is generated and output.

  In S104, the determination unit 23 (processing execution unit) validates the defect part echoes F1, F1-1, F2, and the like, which are the detected echo data stored in the second storage unit 21H when the valid command signal is input. . On the other hand, when the invalidation command signal is input, the determination unit 23 invalidates the defect part echoes F1, F1-1, F2, and the like, which are detection echo data stored in the second storage unit 21H. The determination part 23 (process execution part) will output these to an output part, when defect part echo F1, F1-1, F2, etc. are validated (output FV of FIG. 5).

  Next, the case of correcting data will be described with reference to FIGS. 9 and 10 and FIGS. 7 and 8 described above.

  FIG. 9 is a block diagram of the data processing unit 19 when correcting data. 9, the comparison unit 22 is a correction amount calculation unit 24 (command signal output unit) and the determination unit 23 is a correction unit 25 (process execution unit) with respect to FIG. The correction processing operation of the data processing unit 19 shown in FIG. 9 will be described with reference to the flowchart of FIG.

  In S201, as in S101, the first storage unit 21S receives and stores the back echo B (specific part echo data) shown in FIG.

  In S202, as in S102, the second storage unit 21H (detected echo data storage unit) corresponds to an echo detected by at least one of the plurality of oblique angle transducers 11 and the vertical transducers 10. The detected echo data, which is data, is stored. Similarly to S102, the second storage unit 21H stores the defect part echoes F1, F1-1, F2, and the like, which are detected echo data.

  In S203, the correction amount calculation unit 24 (command signal output unit) is sent from the back echo B (specific part echo data) stored in the first storage unit 21S and a preset reference value JT (for example, from the control unit 26). Compare). As a comparison method, as in S103, the correction amount calculation unit 24 compares the “back echo height BE” of the back echo B with the reference value JT as shown in FIG. Based on the comparison result, the correction amount calculation unit 24 generates and outputs a correction command signal JC for instructing correction of the detected echo data stored in the second storage unit 21H. As a specific example, the correction amount calculation unit 24 calculates the ratio between the “back echo height BE” and the reference value JT. As a result of the calculation, if the “back echo height BE” is 50% of the reference value JT, an instruction to double the value (size) of the detected echo data stored in the second storage unit 21H is included. A correction command signal JC is generated and output.

  In S204, when the correction command signal JC is input, the correction unit 25 corrects the detected echo data stored in the second storage unit 21H according to the input correction command signal JC. In the example described above, the correction unit 25 receives the correction command signal JC containing the instruction to double the value (size) of the detected echo data stored in the second storage unit 21H. In this case, correction is performed to double the values of the defect echoes F1, F1-1, F2, etc., which are the detected echo data stored in the second storage unit 21H. The correction unit 25 outputs the corrected data to the output unit 20 (FN in FIG. 9).

  Although the data acceptance / rejection and the data correction have been described above, this is an example. The comparison unit 22 shown in FIG. 5 compares the specific unit echo data stored in the first storage unit 21S with a preset reference value, and instructs the execution of a predetermined process based on the comparison result. It has the function to generate and output. And the determination part 23 has a function which inputs the command signal which the comparison part 22 output, and performs a predetermined process with respect to the detected echo data which the 2nd memory | storage part 21H memorize | stored according to the input command signal. .

  In the ultrasonic flaw detector 100 according to the second embodiment, the determination unit 23 determines whether or not the detected data is accepted, so that a highly accurate measurement result can be obtained.

  In the ultrasonic flaw detector 100 according to the second embodiment, since the correction unit 25 performs correction processing on the detected data, the inspection can be performed with stable performance.

  In the above embodiment, an ultrasonic probe composed of a vertical vibrator and a plurality of oblique vibrators capable of transmitting and receiving ultrasonic waves, and an ultrasonic echo signal detected while giving a transmission pulse to each vibrator A transmission / reception unit for receiving the received signal, an amplification unit for amplifying the received signal, a data processing unit for storing or judging the amplified received signal, and an output unit for presenting the processing result to the outside, A bolt ultrasonic flaw detector characterized in that it is configured as an integrated composite probe placed in the center and housed in the same case with a plurality of oblique angle transducers arranged around it.

  In the above embodiments, the transmission / reception unit, the amplification unit, the data processing unit, and the output unit are temporally switched to share one or more parts between the vertical vibrator and the oblique vibrator. An ultrasonic flaw detector for bolts that has been used in the past has been described.

  In the above embodiment, the contact ring is provided on the outer periphery of the composite probe, and the magnet is used for the entire contact ring or a part thereof, so that the probe can be opened without being suppressed from the outside. An ultrasonic flaw detector for bolts in which the entire probe can come into contact with the head of the bolt has been described.

  In the above embodiments, the validity / invalidity of the bolt inspection data obtained by the data processing of the vertical vibrator and the oblique vibrator is determined based on the echo height from the bolt specifying part obtained by the data processing of the vertical vibrator. An ultrasonic flaw detector for bolts that has been made to be described has been described.

  In the above embodiment, correction is applied to the sensitivity of the inspection data of the bolts obtained by the data processing of the vertical vibrator and the oblique vibrator by the echo height from the bolt specifying part obtained by the data processing of the vertical vibrator. An ultrasonic flaw detector for bolts has been described.

1 is a diagram showing an ultrasonic flaw detector 100 provided with a composite probe 12 according to Embodiment 1. FIG. FIG. 3 shows a configuration of a composite probe 12 in the first embodiment. The figure which mounted | wore the bolt head upper surface 2a with the compound probe 12 in Embodiment 1. FIG. The composite probe 12 in Embodiment 1 is a figure which shows the structure further provided with the magnet 9. FIG. The block diagram of the data processing part 19 which performs the data acceptance / rejection processing in Embodiment 2. FIG. 6 is a flowchart showing the operation of the data processing unit 19 of FIG. The output echo waveform of the vertical vibrator 10 in the second embodiment. The output echo waveform of the oblique vibrator 11 according to the second embodiment. FIG. 6 is a block diagram of a data processing unit 19 that performs data correction processing according to Embodiment 2. 10 is a flowchart showing the operation of the data processing unit 19 in FIG. 9. The figure explaining a prior art. The figure explaining a prior art.

Explanation of symbols

  1 bolt, 2 bolt head, 2a top surface of bolt head, 3 bolt trunk, 4 bolt screw, 5 contact medium, 6 vertical ultrasonic beam, 7 oblique ultrasonic beam, 8 ring for contact material, 9 Magnet, 10 Vertical vibrator, 11 Oblique vibrator, 12 Compound probe, 13 Connection cable, 14 Switching part, 15 Flaw detector main body, 16 Transmitting / receiving part, 17 Amplifying part, 18 Data processing block, 19 Data processing part, 19H detection side processing unit, 19S specific side processing unit, 20 output unit, 21H second storage unit, 21S first storage unit, 22 comparison unit, 23 determination unit, 24 correction amount calculation unit, 25 correction unit, 26 control unit, 30 cases, 50 ultrasonic probe, 51 unreachable area, 100 ultrasonic flaw detector, F1 defect echo, FE defect echo height, B back echo, BE back echo height JL reference value, JS valid / invalid command signal, JT reference value, JC correction command signal.

Claims (7)

In an ultrasonic probe that is attached to the head of a bolt composed of a head and a shaft and emits an ultrasonic wave toward the shaft, and detects an echo of the emitted ultrasonic wave,
A vertical vibrator that emits ultrasonic waves in substantially the same direction as the axial direction of the shaft portion, and detects echoes of the emitted ultrasonic waves;
An ultrasonic probe comprising: a plurality of oblique angle transducers that emit ultrasonic waves in a predetermined direction different from the axial direction of the shaft portion and detect echoes of the emitted ultrasonic waves. The plurality of oblique angle vibrators are:
The ultrasonic probe according to claim 1, wherein the ultrasonic probe is disposed around the vertical vibrator so as to surround the vertical vibrator. The ultrasonic probe further includes:
The ultrasonic probe according to claim 1, further comprising a magnet.   An ultrasonic flaw detector comprising the ultrasonic probe according to claim 1. The ultrasonic flaw detector further comprises:
Specific part echo data storage for storing specific part echo data that is data corresponding to an echo from a specific part, which is a specific part of the bolt, caused by the ultrasonic wave emitted by the vertical transducer of the ultrasonic probe And
A detection echo data storage unit that stores detection echo data that is data corresponding to an echo detected by at least one of the oblique angle transducer and the vertical transducer;
A command signal output unit that compares the specific part echo data stored in the specific part echo data storage unit with a preset reference value and generates and outputs a command signal for instructing predetermined processing based on the comparison result When,
A command execution unit configured to input a command signal output from the command signal output unit and execute predetermined processing on the detected echo data stored in the detected echo data storage unit in accordance with the input command signal; The ultrasonic flaw detector according to claim 4. The command signal output unit is
A process of comparing the specific part echo data stored in the specific part echo data storage unit with a preset reference value and validating the detected echo data stored in the detection echo data storage unit based on a comparison result. Generate and output either a valid command signal to command or an invalid command signal to command invalidation,
The process execution unit
When the valid command signal is input, the detection echo data stored in the detection echo data storage unit is validated. When the invalid command signal is input, the detection echo data stored in the detection echo data storage unit is invalidated. The ultrasonic flaw detector according to claim 5. The command signal output unit is
The specific part echo data stored in the specific part echo data storage unit is compared with a preset reference value, and based on the comparison result, the correction processing of the detected echo data stored in the detected echo data storage unit is commanded. Generate and output a correction command signal,
The process execution unit
6. The ultrasonic flaw detector according to claim 5, wherein when the correction command signal is input, the detected echo data stored in the detected echo data storage unit is corrected.

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