JP2005249581A - Alignment adjusting mechanism of probe for ultrasonic flaw detection - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the alignment adjusting mechanism for an ultrasonic flaw detection capable of samplifying an adjusting mechanism and enhancing the efficiency of adjusting work. <P>SOLUTION: An offset mechanism is equipped with the support member 5 fixed to an attaching surface 4a and an adjusting member 7 connected to the support member 5 by an offset adjusting bolt 8 so as to be movable in forward and rearward directions and having a probe 1 attached thereto. The offset quantity of the probe 1 from the attaching surface 4a is altered by allowing the offset adjusting bolt 8 to advance and retreat with respect to the support member 5. Further, a parallelism adjusting mechanism is equipped with the fulcrum bolt 10 for adjusting a parallelism connecting the support member 5 and the parallelism adjusting member 7 in a rotatable manner and a bolt 9 for adjusting a parallelism threaded with the end surface in the width direction of the adjusting member 7 so as to come into contact with the offset adjusting bolt 8. The probve 1 is rotated centering around the fulcrum bolt 10 for adjusting a parallelism by the advance and retreat of the bolt 9 for adjusting the parallelism. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an alignment adjustment mechanism that adjusts the position of a probe used in an ultrasonic flaw detector for detecting inclusions in a metal plate such as a rolled metal plate including a steel plate, and particularly in a wide range. The present invention relates to an alignment fine-tuning mechanism for opposing transmitters and receivers in a line focus type ultrasonic line sensor that can detect flaws at once.

  When flaw detection of minute inclusions contained in a metal plate is performed at once over a wide range, for example, a set of line focus type transceivers arranged opposite to each other with a steel plate interposed therebetween is longer than the plate width in the plate width direction. An ultrasonic line sensor, which is an ultrasonic flaw detector, is configured by arranging a plurality of sets over the entire area. Here, each of the line focus type probes (transmitter and receiver) is composed of an array of a plurality of elements, that is, a plurality of channels.

  The plurality of transmission probes and reception probes are each attached to a transmission frame or a reception frame extending in parallel along the plate width direction. At this time, in order to detect minute inclusions by stabilizing the reception waveform of multiple channels, expanding the gate range, narrowing the surface dead zone as much as possible, and increasing the sensitivity, adjust the alignment of the opposing transceiver And it becomes important to attach to the said frame. Further, even after the attachment, the alignment may be out of order, and even in that case, the alignment adjustment is required again.

  For example, in the conventional mounting structure disclosed in Patent Document 1, a tapered shim 130 is used for the mounting surface 100a of the mounting plate 100 as shown in FIG. The offset adjustment mechanism A is attached, the parallelism adjustment mechanism B is attached to the first attachment seat 120 which is a movable part of the offset adjustment mechanism A, and the transmitter is attached to the movable part second attachment seat 180 of the parallelism adjustment mechanism B. 1 can be attached. That is, the alignment adjustment is an offset adjustment that is an adjustment that advances and retracts in a direction orthogonal to the mounting surface 100a (hereinafter referred to as “front-rear direction”), and a parallel that is an adjustment that rotates about an axis orthogonal to the mounting surface 100a. It is an adjustment that performs both degree adjustments.

  Specifically, the offset adjustment mechanism A includes a reference plate 110, a first mounting seat 120, and a shim 130. The reference plate 110 is fixed to the mounting surface 100a of the mounting plate 100, and the surface on the transmitter 1 side of the reference plate 110 has an inclined surface 110a with a taper that approaches the mounting surface 100a as it goes downward. The first mounting seat 120 faces the inclined surface 110 a of the reference plate 110 via the shim 130 and is attached to the reference plate 110 by four bolts 140. A disc spring 150 is provided in the middle of the shaft portion of the bolt 140. By the deformation of the disc spring 150, the distance between the reference plate 110 and the first mounting seat 120 can be changed.

In addition, an overhanging portion 160 projects from the lower side of the first mounting seat 120 toward the reference plate 110 side. A screw hole is passed through the overhanging portion 160 in the vertical direction, and an offset adjusting screw 170 is inserted into the screw hole from below to be fixed in a rotatable state. A front end portion is screwed to a lower end portion of the shim 130.
On the other hand, the parallelism adjusting mechanism B includes a main part composed of the first mounting seat 120 and the second mounting seat 180.

Specifically, a second mounting seat 180 is in contact with the first mounting seat 120. A screw hole is provided in the lower center of the first mounting seat 120 and the second mounting seat 180, and the second mounting seat 180 is attached to the first mounting seat 120 by fastening a screw 190 to both the screw holes. On the other hand, the screw 190 is supported in a forward and reverse rotatable state.
In addition, large-diameter holes large enough to allow the rod body 200 to be freely inserted are formed in the upper left-right symmetrical position of the second mounting seat 180, and the rod body 200 penetrates the large-diameter hole. . Further, parallelism adjusting screws 210 are respectively screwed into the upper end of the second mounting seat 180 in the width direction toward the inside of the large-diameter hole. The tip of each shaft portion of the parallelism adjusting screw 210 is disposed so as to face the side surface of the rod body 200.
The second mounting seat 180 is provided with a probe mounting bolt hole 220, and the transmitter 1 is mounted through the bolt hole 220.

  Next, the method of fine alignment adjustment in the mounting structure will be described. First, when performing fine adjustment of parallelism, the screw 190 is temporarily tightened, and the screwing amount of the pair of parallelism adjustment screws 210 and 210 is set. The second mounting seat 180 is rotationally displaced with respect to the first mounting seat 120 with the screw 190 as a fulcrum. As a result, the transmitter 1 can be finely adjusted to be parallel to the receiver 2.

Next, when performing fine offset adjustment, the offset adjustment screw 170 fixed to the overhanging portion 160 in a freely rotatable state is rotated forward and backward to displace the screwing position of the shaft portion with respect to the shim 130. The position of the shim 130 in the vertical direction is displaced. As the shim 130 slides up and down, the first mounting seat 120 moves in the horizontal direction due to expansion and contraction of the disc spring 150. As a result, the horizontal offset of the transmitter 1 with respect to the mounting plate 100 can be finely adjusted so as to face the receiver 2.
Japanese Patent Application Laid-Open No. 2002-267641

However, in the alignment adjustment using the conventional mounting structure described above, since the disc spring 150 is always pressed, there is a problem that the restoring force characteristic is deteriorated and a misalignment occurs after a certain period of use. In addition, since the mounting structure is always submerged and used, there is a problem that the movement of the shim 130 and the screw 170 tends to deteriorate. In order to avoid these problems, it is necessary to replace the disc spring, adjust the misalignment, clean the offset adjusting mechanism A, overhaul, and the like, so that these adjustment operations take a long time.
The present invention has been made paying attention to the above points, and provides an alignment adjustment mechanism for an ultrasonic flaw detection probe that can simplify the alignment adjustment mechanism to simplify and improve the efficiency of adjustment work. The issue is to provide.

  In order to solve the above-described problems, the present invention provides an alignment for adjusting the position of the probe used in an ultrasonic flaw detection apparatus for flaw detection by arranging a pair of probes facing each other across a metal plate. An adjustment mechanism comprising: a parallelism adjustment mechanism that rotates the probe about an axis orthogonal to the attachment surface; and an offset adjustment mechanism that advances and retracts the probe in a direction orthogonal to the attachment surface. In the alignment adjustment mechanism of the probe for acoustic flaw detection, the offset adjustment mechanism is connected to the flat support member fixed to the mounting surface and an offset adjustment bolt so as to be able to advance and retreat in a direction perpendicular to the mounting surface. And a flat plate-shaped adjusting member to which the probe is mounted, and the offset adjusting bolt is advanced and retracted with respect to the flat plate-shaped supporting member, whereby the mounting surface Adjusting the offset amount of the probe, and the parallelism adjusting mechanism includes the flat plate supporting member, a parallelism adjusting fulcrum bolt that rotatably connects the flat plate adjusting member, and the flat plate shape. A parallelism adjustment bolt that is threadably engaged with the offset adjustment bolt on the end surface in the width direction of the adjustment member, and the parallelism adjustment fulcrum bolt is supported by the advancement and retraction of the parallelism adjustment bolt. As an alignment adjustment mechanism for an ultrasonic flaw detection probe, the parallelism is adjusted by rotating the probe.

  The offset adjustment mechanism in the ultrasonic flaw detection probe alignment adjustment mechanism according to the present invention is connected to the flat plate support member so as to be movable in the front-rear direction by a flat plate support member and an offset adjustment bolt. And an offset amount of the probe from the mounting surface by advancing and retracting the offset adjustment bolt with respect to the plate-like support member. Can be changed.

Further, the parallelism adjustment mechanism in the alignment adjustment mechanism of the ultrasonic flaw detector according to the present invention includes a flat plate-like support member, a parallelism adjustment fulcrum bolt that rotatably connects the flat plate-like adjustment member, and A parallelism adjustment bolt screwed so as to come into contact with the offset adjustment bolt is provided on the end surface in the width direction of the flat plate-shaped adjustment member, and the parallelism adjustment fulcrum bolt is moved forward and backward by the parallelism adjustment bolt. The probe can be rotated about the fulcrum.
Therefore, the present invention eliminates the need for a conventional slide mechanism made up of a disc spring, shim, or the like, thereby simplifying the alignment adjustment mechanism. In addition, since it is not necessary to replace, adjust and overhaul the disc spring, the adjustment work can be simplified and made more efficient.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing an alignment adjustment mechanism of an ultrasonic flaw detection probe according to the present invention, FIG. 2 is a front view showing the alignment adjustment mechanism of the ultrasonic flaw detection probe according to the present invention, and FIG. FIG. 4 is a front view showing a part of the offset adjustment mechanism of the present invention, FIG. 5 is a front view showing a support portion of the present invention, and FIG. 6 is an explanatory view of the prior art.

FIG. 1 is a side view showing an alignment adjustment mechanism of an ultrasonic flaw detector according to the present invention. The transmitter 1 and the receiver 2 of the ultrasonic line sensor are arranged to face each other up and down across a passage of a metal plate 3 that is a plate to be inspected. Each of the probes is composed of a one-dimensional array type probe that is a line focus type ultrasonic probe.
With the above configuration, an ultrasonic wave is transmitted from the transmitter 1, and the reciprocating transmitted wave that reaches the receiver 2 by reciprocating the metal plate 3 in the thickness direction and the metal plate 3 reciprocating in the plate thickness direction to the receiver 2. A reflected wave appearing between the reaching round-trip transmitted wave is extracted, and when the reflected wave is above a predetermined level, it is detected as a reflection from an internal defect.

As shown in FIG. 1, the alignment adjusting mechanism on the transmitter 1 side is fixed to a mounting surface 4a of the mounting plate 4 and can be moved and rotated to the flat supporting member 5. A main part is constituted by the flat plate-like adjusting member 7 to be connected.
Specifically, as shown in FIGS. 1 and 5, four mounting screw holes 5a are opened at the symmetrical position of the central portion of the support member 5, and the inside of these mounting screw holes 5a is formed. Four mounting bolts 6 pass therethrough, and their tips are screwed into screw holes (not shown) of the mounting plate 4. Further, four corners of the support member 5 are provided with offset adjustment screw holes 5b for supporting the adjustment member 7 and performing offset adjustment. Furthermore, a parallelism adjustment fulcrum screw hole 5c for adjusting the parallelism is provided at the lower center of the support member 5 (see FIG. 5).

Next, as shown in FIG. 3, two mounting screw holes 7a are respectively provided at the left and right ends of the adjusting member 7, and the adjusting member 7 is connected to the adjusting member 7 through these mounting screw holes 7a. The probe 1 is fixed (see FIGS. 1 and 2).
On the other hand, corresponding to the positions of the offset adjustment screw holes 5b (see FIGS. 1 and 5) of the support member 5, large diameter holes 11 as shown in FIG. Are provided, and offset adjusting bolts 8 pass through the large-diameter holes 11 so as to be freely inserted (see FIGS. 1 to 3). As shown in FIG. 4, the head of the offset adjustment bolt 8 is fixed to the adjustment member 7 by tightening the offset adjustment bolt 8 with a nut 8 a via a washer 12. Further, as shown in FIG. 1, the tip end portion of the offset adjusting bolt 8 is screwed into the offset adjusting screw hole 5b. Then, by adjusting the offset adjustment bolt 8 to rotate, the adjustment member 7 can move in the front-rear direction (arrow direction in FIG. 1) with respect to the support member 5, and the offset amount can be adjusted.
Here, the support member 5, the adjustment member 7, and the offset adjustment bolt 8 constitute an offset adjustment mechanism (see FIG. 1).

Further, as shown in FIG. 3, two parallelism adjusting bolts 9 toward the large-diameter hole 11 are provided on the front surface in the width direction end surface of the adjusting member 7 so as to be able to contact the offset adjusting bolt 8. Is installed. At this time, the tip of each shaft portion of the parallelism adjusting bolt 9 is in contact with the side surface of the offset adjusting bolt 8. Further, a fulcrum screw hole (not shown) is provided in the lower center of the adjustment member 7, and a parallelism adjustment fulcrum bolt 10 penetrates into the fulcrum screw hole, and its tip portion is the parallelism adjustment fulcrum. Screwed into the screw hole 5c. The shafts of the screw holes 5c and the fulcrum screw holes are orthogonal to the mounting surface 4a, and the adjusting member 7 is attached to the support member 5 by fastening parallelism adjusting fulcrum bolts 10 to both the screw holes. On the other hand, the fulcrum bolt 10 is used as a fulcrum and is supported in a forward / reverse rotatable state. Since there is a gap between the offset adjustment bolt 8 and the large-diameter hole 11, the adjustment member 7 is rotated by the parallelism adjustment bolt 9 within a range in which the gap and the offset adjustment bolt 8 do not interfere with each other. The parallelism can be adjusted.
Here, the support member 5, the adjustment member 7, the parallelism adjustment bolt 9, and the fulcrum bolt 10 constitute a parallelism adjustment mechanism (see FIG. 3).

Next, an operation method of the alignment adjustment mechanism of the present invention will be described.
First, the fine adjustment of the parallelism will be described. When adjusting the parallelism between the opposing receiver 2 and transmitter 1, the parallelism adjustment fulcrum bolt 10 is temporarily tightened and the upper pair of parallelism adjustment bolts 9 are used. While adjusting the gap between the offset adjustment bolt 8 and the large-diameter hole 11, the adjustment member 7 is rotated with respect to the support member 5 using the parallelism adjustment fulcrum bolt 10 as a fulcrum. Thus, fine adjustment is made so that the transmitter 1 is parallel to the receiver 2. When the adjustment is completed, the parallelism adjustment fulcrum bolt 10 is finally tightened.

The confirmation of the fine adjustment of the parallelism is performed as follows. That is, an ultrasonic wave is transmitted from each element of the transmitter 1 in synchronization with each other and received by each element of the corresponding receiver 2, and a reception time in a channel corresponding to each element is detected. This reception time is a time corresponding to the propagation time. That is, if the transmission time is subtracted from the reception time, the propagation time is obtained.
For example, when a plurality of ultrasonic probes of a plurality of channels are used, a set of each transmitter 1 and receiver 2 is set so that the propagation time of the signal is the same based on the reception signal of each channel. By performing fine adjustment of the parallelism, it is possible to accurately make the opposing transceivers 1 and 2 parallel.

  Next, fine adjustment of the offset will be described. When adjusting the offset amount of the transmitter 1 with respect to the mounting surface 4a, the adjustment member 7 is adjusted by rotating the offset adjustment bolt 8 forward and backward to change the screwing position of the shaft portion with respect to the support member 5. Adjust the position in the front-rear direction. For example, when the four offset adjusting bolts 8 are rotated clockwise, the adjusting member 7 moves backward in accordance with the amount of rotation, so that the position of the transmitter 1 is offset in a direction away from the mounting surface 4a. . At this time, since there is a gap between the offset adjusting bolt 8 and the large-diameter hole 11, the adjusting member 7 is also moved in the vertical direction (direction perpendicular to the arrow direction in FIG. 1). Can do.

On the other hand, since the conventional offset adjustment mechanism can only translate in the front-rear direction, it is difficult to increase the sensitivity of a plurality of channels at the same time if there is an error in the manufacture of the probe.
On the other hand, in the present invention, since the four offset adjusting bolts 8 can be adjusted independently, the optimum offset position can be obtained by offsetting the set of the transmitter 1 and the receiver 2 in the vertical and longitudinal directions. Can be specified, and the sensitivity of all channels can be easily increased.

It is a side view which shows the alignment adjustment mechanism of the probe for ultrasonic flaw detection of this invention. It is a front view which shows the alignment adjustment mechanism of the probe for ultrasonic flaw detection of this invention. It is a front view which shows the parallelism adjustment mechanism of this invention. It is a side view which shows a part of offset adjustment mechanism of this invention. It is a front view which shows the support part of this invention. It is explanatory drawing of a prior art.

Explanation of symbols

A Offset adjustment mechanism B Parallelism adjustment mechanism 1 Probe (transmitter)
2 Probe (receiver)
3 Metal plate 4 Mounting plate 4a Mounting surface 5 Flat support member 5a Mounting screw hole 5b Offset adjustment screw hole 5c Parallelism adjustment fulcrum screw hole 6 Mounting bolt 7 Flat adjustment member 7a Mounting hole 8 Offset adjustment Bolt 8a nut 9 parallelism adjusting bolt 10 parallelism adjusting fulcrum bolt 11 large diameter hole 12 washer

Claims (1)

An alignment adjustment mechanism that adjusts the position of the probe with respect to the mounting surface, which is used in an ultrasonic flaw detector that detects a pair of probes facing each other across a metal plate, and is orthogonal to the mounting surface In an alignment adjustment mechanism for a probe for ultrasonic testing, comprising: a parallelism adjustment mechanism for rotating the probe around an axis to be rotated; and an offset adjustment mechanism for moving the probe forward and backward in a direction perpendicular to the mounting surface. ,
The offset adjustment mechanism is connected to a flat plate-like support member fixed to the mounting surface and an offset adjustment bolt so as to be able to advance and retreat in a direction perpendicular to the mounting surface and to which the probe is mounted. And adjusting the offset amount of the probe from the mounting surface by advancing and retracting the offset adjustment bolt with respect to the flat plate-shaped support member,
The parallelism adjustment mechanism includes the flat plate-shaped support member, a parallelism adjustment fulcrum bolt that rotatably connects the flat plate-shaped adjustment member, and a width-direction end surface of the flat plate-shaped adjustment member. A parallelism adjusting bolt that is screwed so as to be able to abut against the bolt, and the parallelism adjusting bolt is moved forward and backward to rotate the probe around the parallelism adjusting fulcrum bolt as a fulcrum. Adjusting mechanism of ultrasonic flaw detection probe, characterized by adjusting

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