JPH0533962Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is an all-position multi-probe parallel scanner suitable for application to, for example, an ultrasonic flaw detection device for inspecting welded parts of members with curved parts. Regarding the improvement of

[Conventional technology]

For flaw detection of welds formed on parts with curvature, the probe must be properly installed on the curved surface, and the support and scanning mechanism for the probe are very important requirements. I'm getting old.

Therefore, several scanners having special mechanisms have been developed to satisfy such demands.

One of them is the X/Y scanning type shown in FIG.
A drive section 2 containing a built-in shaft drive motor and a Y-axis drive motor is placed on and engaged with the X-direction rail 1, and an arm 3 is attached to the drive section 2 so as to be protrusive and retractable in the Y-axis direction. . A probe holder 5 is suspended from the tip of this arm 3 via a suspension arm 4, and a probe 6 is fixed to this holder 5. 7 is a member to be tested.

Thus, in the above scanner, the X-axis drive motor and the Y-axis drive motor are alternately drive-controlled, so that the drive section 2 moves along the rail 1 in the X-axis direction, and the arm 3 moves forward and backward to move along the Y-axis. As a result, the probe 6 performs two-dimensional rectangular scanning or zigzag scanning as shown in FIG.

The other one is a multi-joint robot scanning type, which has a multi-joint arm 8 as shown in Fig. 7.
The flaw detection is performed by using software to set the probe 6 to match the curvature of the member 7 while moving each arm 8.

[Problem that the invention attempts to solve]

However, although the former X/Y scanning type is capable of two-dimensional scanning, it has a problem that it is difficult to scan the surface of the member 7 formed in a curved shape, making it difficult to apply. Therefore, in order to solve this problem, it has been considered to adopt a vertical slider as the hanging arm 4, but if the curvature of the member 7 is small, the amount of vertical movement becomes large, and the probe holder mechanism becomes complicated. Become something. Furthermore, since the rectangular scanning method is adopted, the scanning time in the X-axis direction is long, which poses a problem in that the flaw detection work is not efficient.

On the other hand, the latter multi-jointed robot scanning type is
The control means for controlling multiple joints becomes complicated,
It is necessary to create separate software depending on the surface condition of the member 7 to be tested, and the cost is high, making it impractical.

Therefore, the present invention was developed with attention to the above points, and it is an all-position multi-probe that can adequately respond to the surface condition of the member, can perform flaw detection in all positions, and can perform flaw detection efficiently. The purpose is to provide a parallel scanner.

[Means for solving problems]

As a means to achieve the above object, the present invention includes a main frame having a mouth-shaped main frame that has a rotating magnet roller that moves integrally in accordance with the parallel scanning of the probe, and a main frame that is horizontally suspended inside the main frame. , a horizontal frame that constitutes a plurality of support frames in a direction perpendicular to the direction of the part to be inspected, a required number of support frames extending over each of these support frames, and a horizontal frame for each of these support frames. a subframe having a free roller that is supported by pressure so as to fit in the direction of the surface of the member through an elastic member, and is set so that the mounted probe maintains a required distance from the surface of the member; This is an all-position multi-probe parallel scanner with a probe support mechanism.

[Effect]

Therefore, by taking the above-mentioned measures, a plurality of support frames are constructed inside the main frame in the shape of an opening in a direction orthogonal to the direction to be inspected, and the required A sub-frame with a free roller is pressed onto each of these support frames via an elastic member so that it fits into the surface of the member, so each probe can be moved independently. The probes can be moved to follow the condition of the surface of the component, and each probe always maintains a predetermined distance from the surface of the component via a free roller while detecting flaws in the part being tested under optimal position conditions. It can be carried out.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 5. In these figures, 10 is a scanning mechanism capable of parallel scanning that automatically travels in the welding line direction (referred to as the X direction) of a welded part, which is a part to be inspected, for example, on a member having a curved part. For example, a slide guide wheel 15 suspended from a lower part of a motor base 14 is engaged with an X-direction rail 13 on a magnet base 12 which is removably attracted to the member 11 in the X-direction. An X-direction drive motor 16 and an X-direction rotary encoder 17 for detecting the rotation angle of the motor 16 are mounted on the motor base 14 . This X-direction drive motor 16
The rotation is transmitted to a gear 18a in the gear head 18, which meshes with a rack 19 placed on the X-direction rail 13. Therefore, each component 14-18 is connected to the drive motor 16.
By this operation, the gear 18a rotates and travels in the X direction while meshing with the rack 19, and this traveling position can be detected by the output of the encoder 17.

Next, the probe arrangement and probe support mechanism are configured as follows. In the probe support mechanism, a main frame 22, for example, shaped like an opening, is connected to the motor base 14 via a connecting member 21, and is slidable in a direction perpendicular to the X direction. At both ends of the main frame 22, magnet rollers 23 are attached to the front and rear portions of the main frame 22. The magnet rollers 23 are attached to the member 11 and rotated in the X direction. Further, at the central opening of the main frame 22, there are a plurality of pairs of horizontal frames 24a-24a, 24b- arranged at predetermined intervals in a direction orthogonal to the X direction.
24b, 24c-24c are constructed, and three U-shaped support frames 24 are spanned between each pair of frames, for example, 24b-24b. Each of these support frames 24 is provided with a leaf spring 25 as shown in FIG. 3, and the sub-frame 26 is constantly pressed toward the surface of the member 11 by the leaf spring 25. This subframe 26 is the member 11
A free roller 27 is provided to fit the surface of the subframe 26, and a probe 28 is placed on each subframe 26. Therefore, since the free roller 27 is provided on the subframe 26, each probe 28 does not approach the surface of the member 11 more than necessary when the scanning mechanism 10 scans in the X direction. Further, since the subframe 26 itself is pressed by the leaf spring 25, it can sufficiently cope with deformation of the member 11. Note that each subframe 26 is supported by bolts and nuts so as to be able to slide in the X direction to some extent. Also,
A plurality of probes 28 mounted on the sub-frames 26 are arranged at different positions in the direction orthogonal to the X direction as shown in the figure, and two or more stages are arranged in the X direction as shown in the figure. It is also placed side by side. That is, in this scanner, as shown in FIGS. 4 and 5, the probe group 28 is scanned only in parallel to the direction of the part to be inspected 29, that is, in the X direction, and in the front-back direction (Y Regarding the X direction), a plurality of probes 28 are arranged so that the beam spread covers the entire welding area, and if possible, the probes 28 at each stage in the X direction are
They are provided at different positions so that they do not pass through the same position in the direction.

Next, the operation of the scanner configured as above will be explained. First, the magnetic base 12 is attracted to the surface of the member 11 so that the rail 13 is oriented in the X direction, and then, if the probe support mechanism is not connected to the motor base 14, the motor The base 14 and main frame 22 are connected.

When preparations for flaw detection are completed as described above, for example, a control signal from a control system (not shown) is given to the X-direction drive motor 16 at a predetermined timing to continuously or intermittently control the operation at a predetermined speed in the X direction to perform flaw detection scanning. Start. At this time, since the surface of the member 11 is curved, it moves up and down, but the subframe 26 is pressed by the leaf spring 25 with a predetermined pressing force, and the free roller 27 always maintains a predetermined distance from the surface of the member. Since the flaws are detected while being maintained, the flaws can be detected under optimal positional conditions. In addition, since the plurality of probes 28 are arranged at different positions in the Y direction, the entire welded part can be detected by spreading the beam, and the flaws can be detected reliably without performing rectangular scanning as in the conventional method. I can do it.

In addition, only one X-direction drive motor is required for scanning the probe 28, and each probe 28 is held independently by a leaf spring 25, ensuring stability in its posture. Since the main frame 24 is configured to be attracted to the entire main frame 24 using four magnet rollers 23, flaws can be detected from all postures.

In the above embodiment, the probes are arranged in multiple stages in the X direction, but the probes may be arranged in one stage, for example. Further, instead of the magnet roller 23, a normal roller may be used. In addition, subframe 24
Although the plate spring 25 is used to apply pressure, other elastic members having similar functions may be used to apply the pressing force. In addition, the present invention can be implemented with various modifications without departing from the gist thereof.

[Effect of idea]

As described in detail above, according to the present invention, each probe can perform flaw detection while following the condition of the component surface independently and in all postures, and moreover, it can perform stable flaw detection while always maintaining optimal positional conditions. It is possible to provide an all-position multi-probe parallel scanner that can perform flaw detection on a part to be flaw-detected while the present invention is in place, and greatly contributes to shortening scanning time and increasing the efficiency of flaw detection work.

[Brief explanation of the drawing]

Figures 1 to 5 are shown to explain one embodiment of the scanner according to the present invention. Figure 1 is a front view of the scanner, and Figure 2 is a diagram showing the arrangement of the probe and the probe. FIG. 3 is a top view showing the support mechanism. Figure 3 is a diagram showing how the subframe on which the probe is placed is supported with respect to the main frame, Figures 4 and 5 are diagrams showing the arrangement of the probes, and Figures 6 and 7. 2A and 2B are schematic configuration diagrams illustrating conventional scanners, respectively. 10... Parallel scanner, 11... Member, 12...
Magnetic base, 13...X direction rail, 14
...Motor base, 16...X direction drive motor,
21... Connection frame, 22... Main frame, 23... Magnet roller, 24... Support frame, 24a, 24b, 24c... Horizontal frame, 25... Leaf spring, 26... Sub frame, 2
7...Free roller, 28...Probe.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Ultrasonic waves are transmitted from the probe to the part to be inspected of the member while scanning the probe in parallel in the direction of the part to be inspected of the member. A scanner that performs flaw detection includes a main frame having a rotating magnet roller that integrally moves according to the parallel scanning;
A horizontal frame that is installed horizontally inside this main frame and constitutes a plurality of support frames in a direction perpendicular to the direction of the flaw-detected part, and a required number of support frames that span each of these support frames. Each of these support frames is pressed and supported via an elastic member so as to fit in the direction of the surface of the member, and set so that the mounted probe maintains a required distance from the surface of the member. An all-position multi-probe parallel scanner characterized by comprising a probe support mechanism consisting of a subframe with free rollers. (2) If the member has a welded part, the direction of the part to be inspected is the direction of the weld line of the welded part of the member.Claim No. 1 of Utility Model Registration All-position multi-probe parallel scanner described in Section 1.