JP6690251B2 - Ultrasonic flaw detector probe holder - Google Patents

Description

  The present invention relates to a flaw detection probe holder for an ultrasonic flaw detector, and more particularly to a flaw detection probe holder that can favorably hold a flaw detection probe along an upper half circumferential surface of an object to be inspected that bulges in an arc shape.

  Ultrasonic flaw detection is being used for precise automatic flaw detection of steel products in a line, but erroneous flaw detection may occur due to overdetection due to various factors such as backlash and the presence of adhered scale during flaw detection. In this case, the steel material judged to have flaws is again inspected offline, but in the past, the inspection probe of a portable ultrasonic flaw detector was applied to the steel material surface by the operator in the contact medium underwater. Is going. Patent Document 1 discloses an example of a portable ultrasonic flaw detector.

Japanese Patent Laid-Open No. 11-337534

  However, in the conventional flaw detection that directly holds the flaw detection probe as described above, the flaw detection probe is arranged exactly above the round bar and at a position where the axis of the longitudinal direction of the round bar and the axis of the element array direction of the phased array probe are orthogonal to each other. However, there is a problem that it is impossible to obtain a highly accurate flaw detection result.

  Therefore, the present invention solves such a problem, and a flaw detection probe holder for an ultrasonic flaw detector capable of easily and highly accurately performing flaw detection on a flaw detection target material using a flaw detection probe of a portable flaw detector. The purpose is to provide.

In order to achieve the above object, in the first aspect of the present invention, a box-shaped main body (1) that opens downward is provided, and an ultrasonic flaw detection probe (2) is provided in the main body space (S) on the top wall of the main body (1). The main body (1) is provided with a medium supply path (111) and a medium discharge path (S1 to S4) on the chamber wall of the main body (1) for circulating the contact medium into the main body (1). The opening edge (121) of (1) is formed in a shape that contacts the upper half-peripheral surface of the rod-shaped flaw detection target material (M) in a liquid-tight manner and is in contact with the top half wall (16) of the main body space (S). Is formed so as to be inclined and opened downward, and the contact medium is discharged from the medium supply path (111) to the medium discharge paths (S1 to S3) extending above the main body space (S) through the main body space (S). Distribute .

  In the first aspect of the present invention, the ultrasonic flaw detection probe is provided in the box-shaped main body, and the main body is provided so as to be in liquid-tight contact with the upper half circumferential surface of the rod-shaped flaw detection target material with the space in the main body filled with the contact medium. As a result, it is possible to perform flaw detection on the flaw detection material simply and with high accuracy, as compared with the conventional case where an operator picks up an ultrasonic flaw detection probe and applies it to the surface of the flaw detection material to perform flaw detection.

  In the second aspect of the present invention, the main body (1) is composed of an upper half portion (11) and a lower half portion (12) that can be separated, and a shape that follows the upper half peripheral surface of the material to be detected (M) having a different cross-sectional shape. It can be replaced with another lower half (12) having an opening edge formed in the.

  In the second aspect of the present invention, it is possible to perform flaw detection on the flaw detection target materials having different cross-sectional shapes with one flaw detection probe holder.

  In the third aspect of the invention, the material to be detected (M) is a round bar, and the opening edges of the main body (1) to the lower half (12) are projected in an arc shape of the material to be detected (M). It is a concave curved surface that follows the semi-circular surface.

  It should be noted that the reference numerals in the parentheses refer to corresponding relationships with specific means described in the embodiments described later.

  As described above, according to the flaw detection probe holder of the ultrasonic flaw detector of the present invention, it is possible to perform flaw detection of a steel material simply and highly accurately by using the flaw detection probe of the portable flaw detector.

FIG. 3 is a perspective view showing a state where a flaw detection probe holder is installed on an upper half peripheral surface of a round bar, showing an embodiment of the present invention. It is a vertical sectional view of a flaw detection probe holder. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is a setting conversion graph of the diameter of the round bar and the ultrasonic wave convergence position from the flat plate surface.

  The embodiments described below are merely examples, and various design improvements made by those skilled in the art are also included in the scope of the present invention without departing from the scope of the present invention.

  FIG. 1 is a perspective view showing a state in which the flaw detection probe holder H is installed on the upper half circumferential surface of a solid round bar M which is a flaw detection target. Further, FIG. 2 shows a vertical sectional view of the flaw detection probe holder H. A flaw detection probe holder (hereinafter, simply referred to as a holder) H has a rectangular block body made of a resin material as its main body 1 and has a box shape having a space S formed therein, and the internal space S is open downward. . The main body 1 is composed of a separable upper half 11 and a lower half 12.

  A straight guide groove 112 is formed in the center of the top wall of the upper half 11 of the main body 1 in a direction orthogonal to the round bar, and a rectangular slide substrate 17 can slide in the guide groove 112. It is installed in. A rectangular cylindrical housing portion 13 is provided at the center of the slide substrate 17 so as to project upward, and the flaw detection probe 2 which is slightly smaller than this is accommodated in the housing portion 13.

  At one end of the slide substrate 17 in the longitudinal direction, a nut member 31 having a female screw portion 311 formed horizontally is formed so as to stand upright. On the other hand, a stay 32 provided on a side surface of the upper half portion 11 has a male screw portion 331. The formed adjusting screw 33 is rotatably supported in a horizontal posture. The male screw portion 331 of the adjusting screw 33 is inserted and coupled into the female screw portion 311 of the nut member 31. As a result, the adjusting screw 33 can be rotated in the forward and reverse directions to linearly move the slide substrate 17, that is, the flaw detection probe 2 in the left-right direction of FIG.

  The flaw detection probe 2 is of a commercially available phased array type, and the lower surface of the flaw detection probe 2 that faces the inside of the main body space S below through the lower opening of the accommodating portion that penetrates the slide substrate is a view that traverses a round bar. A plurality of ultrasonic transducers are arranged adjacent to each other in the left-right direction of 2. A cable 21 extending from the upper surface of the flaw detection probe 2 is connected to a portable ultrasonic flaw detector (not shown).

  As shown in FIG. 3, at the periphery of the lower opening 131 of the accommodating portion 13, support pieces 14 are respectively projected inwardly on four sides, and the four corners of the opening 131, which are the boundaries of the support pieces 14, are outside. Each of them is hollowed out to form a gap S1. In a state in which the flaw detection probe 2 is accommodated in the accommodating portion 13, the four sides of the lower surface of the flaw detection probe 2 are positioned on and supported by the support pieces 14, and in this state, the gaps S1 are vertically arranged at the four corners of the flaw detection probe 2. Extending to.

  In FIG. 2, a lid 15 is attached to the upper opening of the housing portion 13, and a gap S2 communicating with the gap S1 is formed between the lower surface of the lid 15 and the upper surface of the flaw detection probe 2. . Further, a gap S3 is formed around the cable 21 with the lid body 15 and communicates with the gap S2. The space S in the main body 1 communicates with the outside due to the gaps S1 to S3, and a water discharge passage as a contact medium described later is formed.

The top wall 16 of the space S in the main body 1 is opened downward at a constant angle from the support piece 14 as shown in the left-right direction of FIG. The chamber wall 19 extends parallel to the vertical direction in the front-back direction of the paper surface of FIG. 2 along M (FIG. 3). Thereby, it is possible to suppress noise reflection of ultrasonic waves emitted in the left-right direction in FIG. 2 while maintaining a sufficiently small volume of the main body 1 that does not require time for filling the contact medium described later and can suppress entrainment of bubbles. You can Further, a supply path 111 for supplying water as a contact medium is formed through the side wall of the upper half portion 11.

  The lower half 12 of the main body 1 is formed into a rectangular ring body, and the upper opening thereof has a shape corresponding to the lower opening of the upper half 11 of the main body. Further, at the opening edge of the lower opening of the lower half portion 12, front and rear lower end surfaces 121 located in the direction along the round bar M are curved in an arc shape following the upper half peripheral surface of the cross section of the round bar M. The left and right lower end surfaces 122 are formed as concave curved surfaces and are curved surfaces following the upper half circumferential surface of the round bar M, which also extends in the longitudinal direction. As a result, the opening 18 of the space S in the main body 1 is in liquid-tight contact with the curved surface of the upper half circumferential surface of the round bar M in a certain range.

When performing flaw detection on the round bar M using the flaw detection probe holder H as described above, the body opening 18 of the holder H is, as shown in FIG. It is positioned so as to be in liquid-tight contact with the upper half circumferential surface, and in this state, a hose is connected to the supply path 111 to supply water into the space S of the main body 1. The supplied water is discharged from above the main body 1 to the outside through the gaps S1 to S3 that fill the main body space S and form the water discharge path.

  Each ultrasonic transducer of the flaw detection probe 2 is excited with a predetermined delay time, and an ultrasonic beam by interference synthesis is sent into the space S below. This beam is configured to be focused (focus) to a position of D / 4 (D is the diameter of the round bar) from the bottom surface of the round bar M (see FIG. 2). At this time, the position of the flaw detection probe 2 is changed and adjusted by appropriately rotating the adjustment screw 33 so that the ultrasonic beam converges just below the center of the cross section of the round bar M.

  Here, a commercially available portable ultrasonic flaw detector is usually one that can automatically set the flaw detection depth (convergence position) of a flat plate and / or a pipe, that is, can automatically calculate the delay time of each ultrasonic transducer at this time, The flaw detection depth of the solid round bar M is not set automatically. In this case, if the solid round bar M is flaw-detected by setting a flat plate or a pipe, the ultrasonic waves do not converge to a required position, and flaw detection cannot be performed well.

  In view of this, in the present embodiment, an ultrasonic flaw detector capable of preliminarily flaw-detecting the solid round bar M causes ultrasonic vibrations when an ultrasonic beam that converges from the bottom surface of the round bar M to a position of D / 4 is formed. The delay time of the child is calculated, and the convergence position when the ultrasonic beam is formed on the flat plate by setting the delay time is confirmed by simulation. FIG. 4 shows a graph in which this is confirmed for the round bar materials M having different diameters.

  According to this, for example, when the diameter (D) of the round bar M is 35 mm and the ultrasonic waves are converged from the bottom surface to a position of D / 4 = 8.75 mm, a portable ultrasonic flaw detector is used. In, the convergence position from the surface of the flat plate may be set to 5.0 mm.

  By performing the above flaw detection by appropriately rotating or moving the round bar M, offline flaw detection is performed by using a commercially available portable ultrasonic flaw detector that is excellent in waterproofing, vibration proofing, and dustproofing and is inexpensive. Can be performed easily and with high accuracy.

  In the present embodiment, when the round bar M having a different outer diameter is to be flaw-detected, it can be easily dealt with by replacing it with another lower half 12 formed in advance in a different concave curved surface following the upper half circumferential surface thereof. be able to. Moreover, although the flaw detection of the round bar has been described in the above embodiment, the sectional shape of the bar is not particularly limited.

DESCRIPTION OF SYMBOLS 1 ... Main body, 11 ... Upper half part, 111 ... Water supply path (medium supply path), 12 ... Lower half part, 121 ... Lower end surface (opening edge) 2 ... Ultrasonic flaw detection probe, M ... Round bar material (flaw detection) Material), S ... Space, S1 to S3 ... Gap (medium discharge path).

Claims (3)

A box-shaped main body that opens downward, an ultrasonic flaw detection probe is provided on the top wall of the main body toward the inside of the main body space, and a medium supply path for circulating a contact medium into the main body wall on the chamber wall of the main body. And a medium discharge path, and the opening edge of the main body is formed in a shape that contacts the upper half circumferential surface of the rod-shaped flaw-detecting material in a liquid-tight manner , and the top wall of the main body space is inclined and opened downward. A flaw detection probe holder for an ultrasonic flaw detector, characterized in that the contact medium is circulated from the medium supply path to the medium discharge path extending above the main body space through the main body space . The main body is composed of a separable upper half part and a lower half part, and is replaceable with another lower half part having an opening edge formed in a shape following the upper half peripheral surface of the material to be inspected having a different sectional shape. Item 1. A flaw detection probe holder for an ultrasonic flaw detector according to Item 1. The said flaw detection material is a round bar material, The opening edge of the said main body or a lower half part was made into the concave curved surface which imitated the upper half peripheral surface which protrudes in circular arc shape of the flaw detection material. A flaw detection probe holder for an ultrasonic flaw detector.

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