JP4551832B2 - Tube thickness measuring device - Google Patents

Description

  The present invention relates to a tube thickness measuring apparatus that measures a tube thickness from within a tube using an ultrasonic probe.

  Various apparatuses using an ultrasonic probe have been proposed as non-destructive measuring apparatuses for pipe thickness (see Patent Documents 1 to 3 below).

  The thing of the following patent document 1 equips the main body which is equipped with an ultrasonic probe and is inserted in a pipe | tube, attaches a main body to the front-end | tip of the introduction means which consists of coil springs, introduces the main body into a pipe | tube, The thickness of the pipe is measured in a state in which it is brought into close contact with the inner surface of the pipe by an adsorption force.

  The thing of the following patent document 2 provides the arm which presses the contact block which incorporated the ultrasonic probe to the inner surface of a pipe | tube, via the arm from the inspection head introduced in the state centered in the center position in a pipe | tube. Tube thickness measurement and defect inspection are performed in a state where the contact block is pressed against the opposite position of the inner surface of the tube.

  In addition, the one described in Patent Document 3 below uses a flaw detection probe insertion rod on the inner surface of a thin tube as a hollow rod that can be bent freely. A water supply tube and a signal cable are housed inside the flaw detection probe while spirally scanning the insertion rod. An ultrasonic flaw detection test using a probe is performed. In this prior art, it is shown that a pair of water seals that are in close contact with the inner surface of the tube are provided so as to sandwich the probe of the flaw detection probe, and water that serves as a contact medium is supplied between the water seals.

JP-A-9-273922 Japanese Patent Laid-Open No. 2001-4603 JP-A-8-86774

  In tube thickness measurement using an ultrasonic probe, if there is an air gap between the ultrasonic probe and the measurement surface, the ultrasonic wave is reflected by the air gap and does not enter the thickness of the measurement target. Therefore, tube thickness measurement cannot be performed. In order to prevent this, the space between the ultrasonic probe and the surface to be measured is generally filled with a contact medium such as water.

  In the above-described Patent Documents 1 and 2, the member storing the ultrasonic probe is brought into close contact with the surface to be measured by a magnetic force or a reaction force of an arm, and a contact medium is supplied to a minute gap generated at that time. However, if the member storing the ultrasonic probe is brought into close contact with the surface to be measured by the magnetic force or the reaction force of the arm as in these conventional techniques, the member is A large frictional force is generated for the movement in the tube, and for example, there is a problem that the tube cannot be freely scanned in and around the tube axis. Further, since a contact medium such as water is always supplied in a dripping state, there is a problem that bubbles are easily mixed into the contact medium flowing out and a good measurement result cannot be obtained.

  In addition, as described in Patent Document 3, a pair of seal members that are in close contact with the inner surface of the tube so as to sandwich the probe are provided, and water serving as a contact medium is supplied between the seal members. Since the seal member is always in contact with the inner surface of the tube and generates a large friction, the ultrasonic probe can be smoothly scanned in the tube axis direction and the direction around the tube axis, as in the prior art described above. This makes it difficult to measure the thickness of the pipe in the pipe with good workability.

  The present invention has been proposed in order to cope with such a situation, and it is possible to smoothly scan the ultrasonic probe in the tube axis direction and in the direction around the tube axis. It is an object of the present invention that tube thickness measurement can be performed, that the contact medium can be held in a stable state between the ultrasonic probe and the surface to be measured.

In order to achieve such an object, the pipe thickness measuring device of the present invention has the following features.
First, an ultrasonic probe that transmits and receives ultrasonic waves to the measurement surface on the inner surface of the tube is stored inside, and is filled between the measurement surface and the ultrasonic probe. A probe storage section having a discharge port for discharging a contact medium; an introduction member extending in front and back of the introduction direction of the probe storage section; and introducing the probe storage section into a tube; and the introduction member And a supply hose for supplying the contact medium to the discharge port, and absorbing and expanding the contact medium on the outer periphery of the introduction member before and after the introduction direction of the probe storage unit. The contact medium holding member that is in close contact with the inner surface of the tube , holds the contact medium filled between the measurement surface and the ultrasonic probe, and is slidable with respect to the inner surface of the tube with low friction Is provided.

  Further, in the tube thickness measuring apparatus having the above-described characteristics, the probe storage portion has an outer diameter and a width that allow conduction within a curved tube, and the introduction member is a flexible member that can be elastically bent. It consists of a sex member.

  In addition, in the tube thickness measuring apparatus having the above-described characteristics, an introduction scanning unit that scans the introduction member along the introduction direction outside the measurement target tube, and rotational scanning of the introduction member around the tube axis. The probe storage section is scanned in the tube axis direction and the tube axis direction by the introduction scanning unit and the rotation scanning unit.

  Further, in the tube thickness measuring apparatus having the above-described characteristics, the introduction member has torsional rigidity for transmitting the rotation scanning of the rotation scanning means to the scanning around the tube axis of the probe storage unit. It is characterized by.

  In addition, in the tube thickness measuring apparatus having the above-described characteristics, transmission / reception of ultrasonic waves by the ultrasonic probe is performed according to a scanning position set by the introduction scanning unit and the rotational scanning unit, Tube thickness value measuring means for measuring the tube thickness value for each scanning position, tube thickness value evaluating means for evaluating the measured tube thickness value, and displaying the measurement result based on the evaluation result of the tube thickness value evaluating means Display output means for outputting to the means is provided.

  Moreover, in the tube thickness measuring apparatus having the above-described characteristics, the display output unit is configured to evaluate that the tube thickness value is less than a set wall thickness according to the evaluation result of the tube thickness value evaluating unit. A warning is displayed on the display means.

  Further, in the tube thickness measuring apparatus having the above-described features, the display output means displays the tube thickness values for each scanning position in a matrix on a display screen, and displays the warning when displaying the warning. The display screen position corresponding to the position is displayed in a warning color.

According to the tube thickness measuring apparatus having such characteristics, the following effects can be obtained.
When the contact medium is discharged from the discharge port of the probe storage unit, the contact medium is filled between the ultrasonic probe stored in the probe storage unit and the surface to be measured. At the same time, the contact medium holding member provided before and after the introduction direction of the probe storage portion absorbs the released contact medium and expands, and comes into close contact with the inner surface of the tube. Then, the gap formed between the pair of contact medium holding members is filled with the contact medium, and the ultrasonic probe stored in the probe storage unit is disposed therein.

  According to this, before releasing the contact medium, the contact medium holding member is not in close contact with the inner surface of the tube, and the probe storage portion can be inserted into the tube without frictional resistance. In addition, even after the contact medium is released, the contact medium holding member absorbs the contact medium and expands. Therefore, the absorbed contact medium becomes a sliding material for the contact medium holding member that is in close contact with the inner surface of the tube, and is large. The probe storage unit can be moved without generating frictional resistance. In addition, since the contact medium holding member is deformed in a bent tube or a flat tube corresponding to the shape in the tube, the probe storage unit can be moved without great resistance regardless of the shape in the tube.

  Since the contact medium is supplied to the sealed gap between the contact medium holding members, the contact medium is interposed between the ultrasonic probe and the measurement target surface in a stable state, and is stable. Ultrasonic waves can be transmitted and received, and highly accurate measurement is possible. In addition, since the expanded contact medium holding member supports the probe storage part in the tube via the introduction member, the probe storage part can be supported in a stable state substantially at the center position in the tube, This also makes it possible to transmit and receive stable ultrasonic waves and to perform highly accurate measurement.

  At the same time, the probe housing portion has an outer diameter and a width that can be conducted through the curved tube, and the introduction member is made of a flexible member that can be elastically bent. The inside of the tube can be scanned with good workability by moving the tentacle storage portion smoothly. In addition, there is no need for a mechanism for tightly attaching the probe housing to the inner surface of the tube or a complicated mechanism for supporting the inside of the tube. Just set the diameter and width, you can easily cope.

  In addition, since the probe storage unit can be moved smoothly inside the tube, the introduction scanning unit and the rotational scanning unit described above are arranged outside the measurement target tube, and the introduction scanning unit and the rotational scanning unit are used. The probe storage in the tube can be scanned. That is, by scanning from outside the tube, the probe storage portion can be smoothly scanned in the tube axis direction and the tube axis direction via the introduction member.

  In addition, the introduction member is provided with torsional rigidity for transmitting the rotation scanning of the rotation scanning means to the scanning in the direction around the tube axis of the probe storage section, so that the probe storage section can be accurately controlled by the rotation scanning means for the introduction member. It is possible to scan around the tube axis.

  In addition, by providing the above-described tube thickness value measuring means, tube thickness value evaluating means, and display output means, it is possible to appropriately evaluate and confirm the tube thickness value measured stably and with high accuracy.

  In addition, when the tube thickness value is evaluated to be thinner than the set wall thickness according to the evaluation result of the tube thickness value evaluation means, the display output means displays a warning on the display means, so the above-mentioned evaluation / confirmation is ensured. It can be carried out.

  In addition, when the display output means displays the tube thickness value for each scanning position in a matrix on the display screen and displays a warning, the display screen position corresponding to the scanning position is displayed in a warning color, so that the display is more visually recognized. High evaluation and confirmation can be performed.

  With the above characteristics, the tube thickness measuring apparatus of the present invention can smoothly scan the ultrasonic probe in the tube axis direction and the tube axis direction, and in a desired range within the tube with good workability. Tube thickness can be measured. In addition, since the contact medium can be held in a stable state between the ultrasonic probe and the surface to be measured, stable and highly accurate tube thickness measurement can be performed. Thereby, stable and highly accurate tube thickness measurement can be advanced with good workability within a desired range in the tube, and the measurement result can be appropriately evaluated and confirmed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view illustrating a tube thickness measuring apparatus according to an embodiment of the present invention. The tube thickness measurement apparatus 10 includes an ultrasonic probe 11, a probe storage unit 12, an introduction member 13, a supply hose 14, a signal line 15 and the like as constituent elements.

  The ultrasonic probe 11 transmits / receives ultrasonic waves to / from the measurement surface of the tube inner surface 1S, and obtains tube thickness measurement data by transmitting / receiving the ultrasonic waves. The probe storage unit 12 stores the above-described ultrasonic probe 11 inside, and between the opening hole 11 </ b> A that opens the ultrasonic probe 11, the surface to be measured, and the ultrasonic probe 11. A discharge port 12A for discharging the contact medium filled in the container is provided.

  The opening hole 11A may be formed so that the ultrasonic probe 11 is arranged at the center thereof as shown in FIG. 1, or the opening hole 11A is formed in a long hole shape as shown in FIG. Then, the center of the ultrasonic probe 11 and the elongated hole 11A may be formed to be eccentric (eccentric amount e). In the measurement of the bent tube portion, the ultrasonic wave reflected by the curved surface may not return to the ultrasonic probe 11 and it may be difficult to perform the ultrasonic measurement. Ultrasonic measurement can be performed by setting the eccentricity e which has been performed according to the curvature of the curved surface of the bent tube.

  In FIG. 1, the introduction member 13 extends in the front-rear direction of the probe storage unit 12, and the introduction member 13 extended at least on one side includes a supply hose 14, a signal line 15, or the like. Is provided. The introduction member 13 is a linear member that can be introduced along the tube axis, and introduces the probe storage portion 12 attached thereto into the tube.

  The supply hose 14 is provided inside the introduction member 13 and supplies the contact medium to the discharge port 12A. The distal end communicates with the discharge port 12A and the proximal end is connected to the contact medium supply source. . The signal line 15 is connected to the ultrasonic probe 11 and transmits an oscillation signal or a reception signal.

  In the tube thickness measuring apparatus 10 according to the embodiment of the present invention, the outer periphery of the introduction member 13 before and after the introduction direction of the probe storage portion 12 absorbs the contact medium and expands to adhere to the tube inner surface 1S. A contact medium holding member 16 that holds the contact medium filled between the surface to be measured and the ultrasonic probe 11 is provided.

  As the contact medium holding member 16, for example, a water-absorbing base material such as a polymer absorbing polymer is used, and the water-absorbing base material is housed in a water-permeable storage material such as cloth and mounted on the outer periphery of the introduction member 13. Before absorbing the contact medium, it is possible to maintain a state of not being in close contact with the pipe inner surface 1S as shown in FIG. 1A, and to absorb and expand the contact medium such as water discharged from the discharge port 12A. Then, as shown in FIG. 5B, the tube is in close contact with the inner surface 1S.

  When the contact medium holding member 16 expands and comes into close contact with the tube inner surface 1S, the contact medium is accumulated and filled in the gap 17 around the probe storage portion 12 formed between the pair of contact medium holding members 16 and 16. In a stable state. Therefore, a stable contact medium free of bubbles is always filled between the ultrasonic probe 11 and the measurement surface.

  At this time, the contact medium holding member 16 expands in the circumferential direction and comes into close contact with the tube inner surface 1S. Therefore, even if the tube inner surface has a slightly flat cross-sectional shape, the contact medium holding member 16 contacts the shape flexibly. The medium holding member 16 expands while being deformed, and a sufficient contact medium holding performance can be maintained regardless of the shape of the tube inner surface 1S.

  Further, the expanded contact medium holding member 16 comes into close contact with the tube inner surface 1S. However, since the contact medium holding member 16 absorbs a contact medium such as water and expands, it contacts the tube inner surface 1S. The contact medium functions as a lubricant on the contact surface with the medium holding member 16, and can slide along the tube inner surface 1S without generating a large frictional force. Therefore, in a state where the contact medium holding member 16 is expanded, the contact medium holding member 16 is supported along the tube inner surface 1S in a state where the probe storage portion 12 is supported by the substantially central portion in the tube via the introduction member 13. It is possible to move smoothly in the tube axis direction or in the direction around the tube axis.

  An outline of the operation procedure by the tube thickness measuring apparatus 10 according to such an embodiment is as follows. The introduction member 13 is introduced into the tube in the state shown in FIG. 1A, and the probe storage unit 12 is moved to a desired measurement position. Lead to. At that position, the contact medium is discharged from the discharge port 12A, and the discharged contact medium is absorbed and expanded by the contact medium holding member 16 arranged before and after the introduction direction of the probe storage unit 12.

  Thereafter, as shown in FIG. 1B, the contact medium holding member 16 expands and comes into close contact with the pipe inner surface 1S, and the gap 17 between the pair of contact medium holding members 16 and 16 is filled with the contact medium. In this state, ultrasonic waves are transmitted and received from the ultrasonic probe 11, thereby obtaining tube thickness measurement data on the measurement surface. After that, while the contact medium holding member 16 is in close contact with the tube inner surface 1S, the probe storage unit 12 is moved while appropriately supplying the contact medium, and the position of the measurement surface is changed to similarly measure the tube thickness. Get.

  FIG. 3 shows a tube thickness measuring apparatus 10a according to another embodiment of the present invention (the same parts as those in the embodiment shown in FIG. Part omitted). In this embodiment, a pair of support members 18 are provided on both front and rear sides of a pair of contact medium holding members 16 provided on the outer periphery of the introduction member 13. By providing the support member 18, the probe storage unit 12 can be supported in a more stable state. The support member 18 can be formed of a cylindrical member having a diameter slightly smaller than the inner diameter of the tube, and it is desirable to select a material that does not cause large friction on the contact surface between the outer peripheral surface and the tube inner surface 1S.

  FIG. 4 is an explanatory diagram showing the overall configuration of the tube thickness measuring apparatus 10 with a U-shaped curved pipe as a measurement target (the same reference numerals are used for the same parts as those in the embodiment shown in FIG. 1). And some explanations are omitted).

  Here, the probe storage unit 12 has an outer diameter and a width that can be conducted through the curved tube 1, and the introduction member 13 is made of a flexible member that can be elastically bent, and the probe storage unit 12. The outer diameter is slightly smaller than the outer diameter.

  In addition, an introduction scanning unit 2 that scans the introduction member 13 along the introduction direction and a rotation scanning unit 3 that rotationally scans the introduction member 13 around the tube axis are provided outside the measurement target tube 1. The probe storage unit 12 is scanned in the tube axis direction (X direction) and the direction around the tube axis (θ direction) by the rotation scanning unit 3.

  The introduction scanning unit 2 includes, for example, a rotation roller 20 and guide rollers 21a to 21e that are driven to rotate in the direction of an arrow 20a as shown in the figure. A member that scans the introduction member 13 along the introduction direction can be employed. Further, the rotation scanning means 3 may be one that rotationally scans the introduction member 13 by rotationally driving the introduction member holding portion 30 around the axis by a built-in drive means (not shown). The configurations of the introduction scanning unit 2 and the rotary scanning unit 3 shown in the figure are merely examples, and the embodiment of the present invention is not limited thereto.

  Further, the distal end portion 13A of the introduction member 13 has a configuration that can be connected to a traction means or the like as necessary, and the supply hose 14 and the signal line 15 are drawn from the proximal end portion 13B of the introduction member 13. Yes.

  The introduction member 13 is rotationally scanned by the rotational scanning means 3 installed outside the tube, and scans the probe storage unit 12 in the tube in the direction around the tube axis. It is desirable to provide high torsional rigidity that accurately conveys scanning of the probe storage unit 12 around the tube axis. In addition, when introduced into a bending tube, it is necessary to be a flexible member that can be elastically bent. As a member satisfying these requirements, a coil spring or the like that is alternately stacked (for example, triple alternately stacked) can be employed.

  The proximal end portion of the drawn supply hose 14 is connected to the contact medium supply source 4 (consisting of the contact medium containing tank 40 and the supply pump 41), and the proximal end portion of the drawn signal line 15 is the tube thickness value measuring means. 5 is connected. Further, the tube thickness value measuring means 5 is configured to receive scanning position signals from the introduction scanning means 2 and the rotational scanning means 3, respectively. Further, a control means 6 is connected to the tube thickness value measuring means 5, and a display means 7 such as a display is connected to the control means 6.

  FIG. 5 is a block diagram of a tube thickness measuring apparatus according to an embodiment of the present invention, showing an example of a system configuration for outputting a measurement result to the display means 7 by the tube thickness value measuring means 5 and the control means 6.

Here, the tube thickness value measuring means 5 performs transmission / reception of ultrasonic waves by the ultrasonic probe 11 in accordance with the scanning position set by the introduction scanning means 2 and the rotational scanning means 3, and the tube thickness value for each scanning position. Is measured and output. That is, the tube thickness value measuring means 5 obtains the tube thickness value t by performing arithmetic processing (calculating the tube thickness from the time difference of the return of the ultrasound) from the data obtained from the ultrasonic probe 11. The tube thickness value t is output to the control means 6 as a value corresponding to the set scanning position (X _i , θ _j ) of the probe storage unit 12, and the control means 6 outputs this value to the scanning position ( X _i, may be temporarily so as to be stored in the storage means as a theta _j) for each of the table data.

Further, the control unit 6 includes a tube thickness value evaluation unit 61 that evaluates the measured tube thickness value t, and a display output unit 62 that outputs the measurement result to the display unit based on the evaluation result of the tube thickness value evaluation unit 61. I have. In the tube thickness value evaluation means 61, for example, the measured tube thickness value t (X _i , θ _j ) for each scanning position is compared with the set thickness, and when the thickness is less than the set thickness or greater than the set thickness The measurement results are evaluated by separating them. Moreover, you may make it classify and evaluate a difference with setting wall thickness. In this case, the set thickness can be stored in advance as data for each measurement object in the storage means of the control means 6.

The tube thickness value t (X _i , θ _j ) for each scanning position output from the tube thickness value measuring means 5 and the evaluation result of the tube thickness value evaluating means 61 are sent to the display output means 62. For example, the display output unit 62 displays the tube thickness values t (X _i , θ _j ) for each scanning position in a matrix on the display screen of the display unit 7. Further, when it is evaluated that the tube thickness value t (X _i , θ _j ) is thinner than the set wall thickness based on the evaluation result of the tube thickness value evaluating means 61, a warning is displayed on the display means 7. When this warning is displayed, for example, the display screen position of the display means 7 corresponding to the scanning position (X _i , θ _j ) is displayed in a warning color such as red.

  FIG. 6 is an explanatory view showing a flow example of a tube thickness measuring method using the tube thickness measuring apparatus 10 having such a system configuration. In addition, the flow of the tube thickness measuring method shown here is an example, Comprising: It does not specifically limit to this.

  First, the introduction scanning unit 2 is driven, and the probe storage unit 12 is set to a tube axis direction (X direction) position (Xi) where measurement starts (S1). Then, scanning in the direction around the tube axis (θ direction) is performed at the set tube axis direction position (Xi) (S2), and the tube thickness value measuring means 5 performs arithmetic processing on the obtained basic data to obtain the tube thickness. The value t is measured (S3). Then, the tube thickness value t (Xi, θ) measured at an arbitrary θ position in the set Xi is stored in the storage means (S4).

  Thereafter, the introduction scanning means 2 is driven again, and the probe storage unit 12 is moved to the next tube axis direction (X direction) position (S5). If the movement does not reach the measurement end position (NO), steps S1 to S5 described above are repeated based on the moved X-direction position, and if the measurement end position is reached (YES), The evaluation step (S7) is shifted to (S6). When the measurement end position is reached, the storage means stores the tube thickness value t (Xi, θj) corresponding to all scanning positions. Here, the flow in which the tube axis direction position (Xi) is fixed and the tube axis direction (θi) is scanned has been described. However, the present invention is not limited to this, and the tube axis direction (θi) is fixed and the tube axis direction is fixed. A flow of scanning the direction position (Xi) may be used.

  Thereafter, the tube thickness value evaluation means 61 compares the tube thickness value t (Xi, θj) with the set wall thickness and evaluates the tube thickness value (S7). Here, based on the comparison with the set wall thickness, the thinness measurement position (scanning position) and the tube thickness value at that position are extracted (S8). Then, the display output means 62 performs warning display setting for the thin thickness measurement position and its tube thickness value (S9), and outputs a display based on the measurement result and the evaluation result (S10).

FIG. 7 shows a display example by the display means 7. Here, the display screen is divided into two display areas 6A and 6B. In the display area 6A, the X direction position is associated with the vertical direction, the θ direction position is associated with the horizontal direction, and the tube thickness t The evaluation result of (Xi, θj) is displayed in a matrix. That is, the tube thickness value t (Xi, θj) is compared with the set wall thickness, and the display position corresponding to the scanning position (Xi, θj) of the tube thickness value t thinner than the set wall thickness is displayed by color coding or grayscale display. is doing. In the display area 6B, the tube thickness value t at the Xi position (6A ₁ ) selected in the display area 6A is displayed as a bar graph with the horizontal axis corresponding to the θ position.

  According to such a display example, it is possible to confirm the distribution of the thin position in the measurement target on the screen display, and it is possible to grasp at a glance how thin the state is.

  The characteristics of the tube thickness measuring apparatus according to the embodiment of the present invention described above are summarized as follows.

(1) Before the contact medium is discharged from the discharge port 12A in the probe storage unit 12, the contact medium holding member 16 is not in close contact with the tube inner surface 1S, and the probe storage unit 12 is brought into the tube without frictional resistance. Can be inserted. Further, even after the contact medium is discharged from the discharge port 12A, the contact medium holding member 16 absorbs the contact medium and expands. Therefore, the absorbed contact medium is in close contact with the pipe inner surface 1S. Thus, the probe storage section 12 can be moved without generating a large frictional resistance.

(2) Since the contact medium is supplied to the sealed gap 17 between the contact medium holding members 16 and 16, the contact medium is interposed between the ultrasonic probe 11 and the measurement surface in a stable state. Therefore, it is possible to transmit and receive stable ultrasonic waves and to measure the tube thickness value with high accuracy.

(3) Since the expanded contact medium holding member 16 supports the probe storage portion 12 in the tube via the introduction member 13, the probe storage portion 12 is supported in a stable state at a substantially central position in the tube. This also makes it possible to transmit and receive stable ultrasonic waves and to measure the tube thickness value with high accuracy.

(4) Since the probe housing portion 12 has an outer diameter and a width that can be conducted through a curved tube, and the introduction member 13 is made of a flexible member that can be elastically bent, the probe tube 12 can also be used for a bent tube. The inside of the tube can be scanned with good workability by smoothly moving the tentacle storage unit 12.

(5) Since a mechanism for closely attaching the probe storage unit 12 to the inner surface of the tube and a complicated mechanism for supporting the probe storage unit 12 in the tube are not required, even for a small-diameter bent tube, the probe storage unit is provided according to the aperture Simply setting the outer diameter and width of 12 can easily cope with this.

(6) Since the probe storage unit 12 can move in the tube with low friction, the probe is provided by the introduction scanning unit 2 and the rotary scanning unit 3 which are arranged outside the tube and are a scanning unit for the introduction member 13. The storage unit 12 can be smoothly scanned in the tube axis direction (X direction) and the tube axis direction (θ direction).

(7) Since the introducing member 13 has high torsional rigidity that accurately transmits the rotational scanning of the rotational scanning means 3 to the scanning in the direction around the tube axis (θ direction) of the probe storage unit 12, The probe storage unit 12 can be scanned around the tube axis with high accuracy.

(8) By including the tube thickness value measuring means 5, the tube thickness value evaluating means 61, and the display output means 62, it is possible to appropriately evaluate and confirm the tube thickness value t measured stably and with high accuracy.

(9) Since the display output means 62 displays a warning on the display means 7 when the tube thickness value t is evaluated to be thinner than the set wall thickness according to the evaluation result of the pipe thickness value evaluation means 61, the measurement result evaluation / Confirmation can be performed reliably.

(10) Since the display output means 62 displays the tube thickness value t for each scanning position in a matrix form on the display screen and displays the scanning position to be displayed in warning with a warning color on the display screen, evaluation with higher visibility・ Confirmation is possible.

It is explanatory drawing explaining the tube thickness measuring apparatus which concerns on embodiment of this invention. It is explanatory drawing explaining the tube thickness measuring apparatus which concerns on other embodiment of this invention. It is explanatory drawing explaining the tube thickness measuring apparatus which concerns on other embodiment of this invention. It is explanatory drawing which shows the whole structure of the pipe thickness measuring apparatus which concerns on embodiment of this invention. It is explanatory drawing (block diagram) which shows the system configuration | structure of the pipe thickness measuring apparatus which concerns on embodiment of this invention. It is explanatory drawing (flow diagram) which shows the flow of the measuring method using the tube thickness measuring apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the example of a display of the display means in embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe 1S Pipe inner surface 10, 10a Tube thickness measuring device 11 Ultrasonic probe 11A Opening hole 12 Probe storage part 12A Release port 13 Introducing member 14 Supply hose 15 Signal line 16 Contact medium holding member 17 Gap 18 Support member 2 Introduction scanning means 3 Rotating scanning means 4 Contact medium supply source 5 Tube thickness value measuring means 6 Control means 61 Tube thickness value evaluating means 62 Display output means 7 Display means

Claims (7)

An ultrasonic probe that transmits and receives ultrasonic waves to the measurement surface on the inner surface of the tube is stored inside, and a contact medium filled between the measurement surface and the ultrasonic probe is released. A probe housing with a discharge port;
An introduction member that extends before and after the introduction direction of the probe storage portion and introduces the probe storage portion into a pipe;
A supply hose provided inside the introduction member for supplying the contact medium to the discharge port,
The outer circumference of the introduction member before and after the introduction direction of the probe storage portion is in close contact with the inner surface of the tube by absorbing and expanding the contact medium, and between the measurement surface and the ultrasonic probe. A tube thickness measuring apparatus comprising a contact medium holding member that holds the contact medium filled in the tube and is slidable with low friction with respect to the inner surface of the tube .   2. The tube thickness according to claim 1, wherein the probe storage portion has an outer diameter and a width capable of conducting in a curved tube, and the introduction member is made of a flexible member that can be elastically bent. Measuring device. Outside the measurement target tube, an introduction scanning unit that scans the introduction member along the introduction direction, and a rotation scanning unit that rotationally scans the introduction member around the tube axis,
The tube thickness measuring device according to claim 1 or 2, wherein the probe storage unit is scanned in a tube axis direction and a direction around the tube axis by the introduction scanning unit and the rotation scanning unit.   4. The tube thickness measuring apparatus according to claim 3, wherein the introduction member has torsional rigidity for transmitting the rotation scanning of the rotation scanning means to the scanning around the tube axis of the probe storage unit.   Tube thickness value measuring means for performing transmission / reception of ultrasonic waves by the ultrasonic probe according to the scanning position set by the introduction scanning means and the rotational scanning means, and measuring a tube thickness value for each scanning position; The pipe thickness value evaluating means for evaluating the measured tube thickness value, and the display output means for outputting the measurement result to the display means based on the evaluation result of the tube thickness value evaluating means. 4 is a tube thickness measuring apparatus.   The display output means displays a warning on the display means when the tube thickness value is evaluated as being thinner than a set wall thickness according to the evaluation result of the tube thickness value evaluation means. The described tube thickness measuring device.   The display output means displays the tube thickness value for each scanning position in a matrix form on a display screen, and when displaying the warning, displays the display screen position corresponding to the scanning position in a warning color. The tube thickness measuring apparatus according to claim 6.

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