JPH11142379A - Ultrasonic probe scan holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the setting of a foothold or large-scale arrangements even when it is a high place, and efficiently carry out an ultrasonic flaw inspection to a butted weld part. SOLUTION: An ultrasonic transmitting inclined probe 2a and an ultrasonic receiving inclined probe 2b are set right and left to face each other via a required distance. The probes 2a, 3b are held to a holding plate 4 extending in the right-left direction so that the distance can be adjusted. Both end parts of the holding plate 4 are supported at supporting plates 7 having magnet wheels 6. An arm 13 is rotatably mounted at a central part of a holder main body 1. An ultrasonic probe holder of a T shape as a whole is thus constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic probe scanning holder used for ultrasonic inspection of a butt weld of a steel structure located at a high place.

[0002]

2. Description of the Related Art For example, when a butt welding portion of a girder material is subjected to ultrasonic flaw inspection at a construction site of a road bridge such as a highway, conventionally, a method of manually scanning a probe and a method of automatically scanning a probe. There is.

[0003]

However, in the case of the manual method, if the welded portion is directed downward, the worker is in a middle waist posture, and thus there is a problem that a long time operation requires a great deal of labor. Scaffolding is required if the weld is upright and not reachable when reaching.

On the other hand, in the case of the automatic system, an automatic scanning mechanism must be set. However, the automatic scanning mechanism is not only large and expensive, but also requires time to set, and requires an auxiliary worker. There is a problem that it is necessary.

Accordingly, the present invention provides an ultrasonic probe which can efficiently perform ultrasonic inspection of a butt welded portion without the need for erection of a scaffold or large-scale setup even at a high place. It is intended to provide a scanning holder.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an ultrasonic transmission oblique probe and an ultrasonic reception oblique probe which are arranged at a required interval on the left and right. The holder body is formed by attaching the front and rear holding plates extending in the left and right direction to the front and rear holding plates so as to be able to adjust the gap, and supporting the left and right end portions of the front and rear holding plates on the left and right support plates having magnet wheels. A fixed plate is provided between the center portions of the plates, and the arm is rotatably attached to the fixed plate.

[0007] The butt weld can be inspected by disposing the holder body so that the two probes sandwich the butt weld and moving the holder body by scanning the arm. Therefore, as long as the length of the arm is within the range, it is not necessary to install the scaffold even at a high position.

[0008] Further, the ultrasonic transmission oblique probe and the ultrasonic reception oblique probe, which are arranged at a required interval on the left and right, are held by holding plates facing left and right. A screw shaft extending in the left-right direction and a guide rod extending in the left-right direction are disposed through the front and rear portions of the left and right holding plates, and both ends of the screw shaft and the guide rod in the left-right direction have magnet wheels. The input shaft of the bevel gear mechanism is projected on the guide casing of the bevel gear mechanism which is supported by the left and right support plates to form a holder main body, and is bridged between the screw shaft and the guide rod. If the arm is attached via a universal joint, the distance between the probes can be adjusted by rotating the arm at hand.

Further, by employing a structure in which a spring for pressing and urging the probe downward is assembled, the probe can be reliably brought into contact with the surface to be inspected.

Further, the arm connected to the universal joint has a double structure consisting of a core shaft and an outer tube, and the tip of the core shaft is connected to the universal joint, and a knob is provided at the rear end of the core shaft. By doing so, the operation of adjusting the distance between the probes can be performed more smoothly.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 show an embodiment of the present invention.
And the oblique angle probe 2b for ultrasonic reception are disposed to face each other at a required interval on the left and right sides, and extend in the left-right direction between the front part and the rear part of the two probes 2a and 2b. A holding plate 4 having a long hole 3 is arranged, and a set screw 5 passing through the long hole 3 of the holding plate 4 is screwed to both probes 2a and 2b.
a and 2b can be moved to the left and right along the slot 3 via the set screw 5, and the interval between the probes 2a and 2b can be fixed by tightening the set screw 5. The left and right ends of the holding plate 4 are supported by a supporting plate 7 having a magnet wheel 6 attached to the lower front and rear positions, thereby constituting the holder body 1 and the magnet wheel 6 is attracted to the surface of the steel structure to be probed. The sub-elements 2a and 2b can be brought into contact with the surface of the steel structure.

As shown in detail in FIG. 2, the connecting portion between the holding plate 4 and the support plate 7 is provided with a notch hole 8 extending vertically in both front and rear ends of the support plate 7. In the inside, a protruding piece 4a formed at the end of the holding plate 4 is movably inserted in the up and down direction, and a through hole 9 in the up and down direction is provided at a position above the notch hole 8 of the support plate 7, and A connecting screw 10 is inserted through the through hole 9 from above, and the lower end of the connecting screw 10 is screwed and connected to the protruding piece 4 a of the holding plate 4. Further, the upper surface of the protruding piece 4 a A spring 1 is mounted between the upper surface and the connection screw 10 so as to be assembled.
1, the holding plate 4 is pressed down and urged by the elastic force of the spring 11. In a state where the holding plate 4 is pressed down and biased, the probes 2a, 2b are placed between the lower surfaces of the probes 2a, 2b and the lower surface of the magnet wheel 6.
Is set to be slightly downward.

Further, a fixing plate 12 is mounted between the upper edges of the central portions of the front and rear holding plates 4 in the holder body 1, and one end of an arm 13 is attached to the hinge 14 at the center of the upper surface of the fixing plate 12. To be rotatable vertically.
The T-shaped ultrasonic probe holder is formed as a whole so that the holder body 1 is supported at the tip of the arm 13.

When an ultrasonic flaw inspection of the butt weld 16 of the girder member 15 as shown in FIG. 3 is to be performed, an encoder 17 with a magnet, for example, must be installed in an upper position near the butt weld 16 in advance. And the encoder 1
The tip of the scale wire 18 pulled out from 7 is fixed to the holding plate 4 of the holder body 1 and the holder body 1 is set so that the right and left probes 2a and 2b sandwich the butt welded portion 16. The holder body 1 is caused to scan in the vertical direction along the butt weld 16 by an operation from below the arm 13.

In the above case, the level difference E is set so that when the holder body 1 approaches the surface of the girder member 15, the level difference E is set to protrude below the lower surface of the magnet wheel 6. First comes into contact with the surface of the girder material 15,
When a pressing force is applied to the holder body 1 by the operation of the arm 13, the holding plate 4 holding the probes 2a and 2b is relatively pushed up against the spring 11, and at the same time, the magnet wheel 6 15 is adsorbed on the surface of the substrate. Therefore, the scanning of the holder main body 1 can be stabilized by the action of the magnet wheel 6, and the probes 2a and 2b can scan the holder main body 1 even when the holder main body 1 is scanned.
By the action of the attraction force of the magnet wheel 6 and the resilience of the spring 11, contact with the surface of the beam 15 is ensured.

While scanning the holder body 1, ultrasonic waves are emitted obliquely from the transmission angle probe 2a and propagated, and the scattered waves reflected at the butt weld 16 are received by the reception angle probe. 2b, which is detected as a large noise, the noise echo is digitized by an A / D converter, and the digitized waveform is recorded in a memory.
An image is formed by an imaging calculator, and a waveform and a scanned image are displayed on a display in real time. Further, the presence of a defective portion is detected nondestructively by a change in noise frequency characteristics. At this time, the quantitative evaluation of the noise is performed by calculating the area and the band of the noise spectrum with a calculator, comparing with a master curve (by a sound weld having no defect) created and stored in advance, and determining the amount of the defect. It is done by estimating.

When performing the flaw detection as described above, it is determined whether the interval between the transmission angle beam probe 2a and the reception angle beam probe 2b is appropriate by checking the welded portion of the comparison specimen in advance. Have them inspect and confirm. In this case, the probes 2a, 2
The interval b can be set by loosening the set screw 5 and moving the probes 2a and 2b.

In the above description, since the holder body 1 holding the right and left probes 2a and 2b can be handled by operating the arm 13, the vertical butt welding portion 16 is provided at the height where the operator simply reaches. Even if the arm 13 is located above the position, the inspection can be easily performed within the length range of the arm 13. Also, the downward butt weld 1 in FIG.
In the same manner, even when the present invention is applied to 9, the operation can be dealt with by scanning the holder body 1 by operating the arm 13, so that the inspection can be performed without taking the middle waist posture. Therefore, the setup time can be greatly reduced as compared with the conventional method, so that the inspection work can be made more efficient.

FIGS. 4 and 5 show another embodiment of the present invention, in which the distance between the right and left probes 2a and 2b can be easily adjusted.

That is, the probes 2a and 2b are respectively arranged on the opposing surfaces of the holding plate 27 facing left and right, and the probes 2a and 2b are sandwiched between the front and rear positions of the opposing surfaces of the holding plate 27, respectively. The front and rear brackets 20 are protruded as described above, and a vertically long hole 21 is provided at the tip of the front and rear bracket 20, and a pin is provided in the long hole 21 on the front and rear surfaces of the probes 2 a and 2 b. 22 and the holding plate 2
7, upper brackets 23 are attached to the upper ends of the probes 7 so as to protrude above the probes 2a and 2b, respectively.
A mounting screw 25 is screwed into the upper surface of the probes 2a and 2b through a vertical through hole 24 provided at the tip of the probe, and a spring 26 is interposed in the mounting screw 25.

Further, a support plate 7 having a magnet wheel 6 attached to a lower front-rear position is disposed on the left and right outer sides of the left and right holding plates 27 so as to face each other. Both ends of a guide rod 39 through which the holding plate 27 is movably penetrated and both ends of a screw shaft 28 threaded through the holding plate 27 are supported back and forth, and the middle of the screw shaft 28 in the left-right direction. The left and right portions are reverse-threaded, and the upper input bevel gear 2 is connected to the divided portion.
By interposing a bevel gear mechanism 31 composed of the transmission bevel gear 9 and the left and right transmission bevel gears 30 and transmitting the rotation of the input bevel gear 29 to the screw shaft 28 via the transmission bevel gear 30, the distance between the left and right probes 2a and 2b is reduced. The holder main body 1 ′ can be adjusted along the screw shaft 28 and the guide rod 39.

Further, the input shaft 33 of the input bevel gear 29 is projected on a gear casing 32 bridged between the screw shaft 28 and the guide rod 39 so as to support the divided portion of the screw shaft 28, The input shaft 33
The distal end of the core shaft 34 of the arm 36 having a double structure consisting of the core shaft 34 and the outer tube 35 is connected via a universal joint 37, and a knob 38 is attached to the rear end of the core shaft 34. The core shaft 34 is provided by rotating the knob 38.
And the rotation is applied to the universal joint 37.
Through the input bevel gear 29.

When the configuration shown in FIGS. 4 and 5 is adopted,
When the knob 38 provided at the rear end of the core shaft 34 of the arm 36 is rotated by hand to rotate the core shaft 34, the rotational force is sequentially applied to the universal joint 37 and the bevel gear mechanism 3.
1. The holding plate 27 is transmitted to the screw shaft 28.
The distance between the left and right probes 2a and 2b can be adjusted through the movement of the probe. Therefore, in FIG. 3, when the condition of the welded portion is different, such as when shifting from the inspection of the upright butt welded portion 16 to the inspection of the downward butt welded portion 19, the interval between the probes 2a and 2b can be simplified. This is advantageous because it can be adjusted by simple operations. The spring 26 interposed between the probes 2a and 2b and the upper bracket 23 has the same function as the spring 11 shown in FIG. 2b can be secured.

The spring 11 shown in FIG. 2 and the spring 26 shown in FIG. 5 are not indispensable, and the outer tube 35 of the arm 36 shown in FIGS.
Is for facilitating the rotation operation of the core shaft 34. However, only the core shaft 34 may be configured as an arm.
Of course, various changes can be made without departing from the spirit of the present invention.

[0026]

As described above, according to the ultrasonic probe scanning holder of the present invention, the following excellent effects are exhibited. (1) The ultrasonic transmission bevel probe and the ultrasonic reception bevel probe, which are arranged at a required interval on the left and right, are attached to the front and rear holding plates extending in the left and right direction so that the distance can be adjusted. The left and right ends of the holding plate are supported by left and right support plates having magnet wheels to form a holder body, and a fixing plate is provided between the center portions of the front and rear holding plates, and an arm is provided on the fixing plate. Since it is configured to be rotatable, the holder body and the arm that hold the two probes are T-shaped, so that the scaffold can be used for inspection of a butt weld or a butt weld at a high position. It is possible to work in a comfortable posture without the need for erection and large-scale setup,
Inspection work can be performed efficiently and inexpensively without the need for an auxiliary worker. (2) The ultrasonic transmission bevel probe and the ultrasonic reception bevel probe, which are arranged on the left and right at a required interval, are held by holding plates facing left and right, and a bevel gear is interposed in the middle. The screw shaft extending in the left and right direction and the guide rod extending in the left and right direction are arranged through the front and rear portions of the left and right holding plates,
The left and right ends of the screw shaft and the guide rod are supported by left and right support plates having magnet wheels to form a holder body, and a guide of a bevel gear mechanism bridged between the screw shaft and the intermediate portion of the guide rod. By making the input shaft of the bevel gear mechanism protrude on the casing and attaching the arm to the input shaft via a universal joint, when the arm is rotated at hand, the rotation is sequentially transmitted to the screw shaft Since the distance between the probes can be adjusted by moving the holding plate, the handling becomes easier. (3) By adopting a structure in which a spring for pressing and urging the probe downward is assembled, it is possible to ensure the contact property of the probe to the inspection target surface. (4) By making the arm connected to the universal joint a double structure consisting of a core shaft and an outer tube, connecting the tip of the core shaft to the universal joint and providing a knob at the rear end of the core shaft In addition, the operation of adjusting the distance between the probes can be performed more smoothly.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of an ultrasonic probe scanning holder according to the present invention.

FIG. 2 is a partially cut front view showing details of a portion A in FIG. 1;

FIG. 3 is a schematic diagram showing an example of a use state.

FIG. 4 is a schematic plan view showing another embodiment of the present invention.

FIG. 5 is a view taken in the direction of arrows BB in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1 'Holder main body 2a Oblique probe for ultrasonic transmission 2b Oblique probe for ultrasonic reception 4 Holding plate 6 Magnet wheel 7 Support plate 11 Spring 12 Fixing plate 13 Arm 26 Spring 27 Holding plate 28 Screw shaft 31 bevel gear mechanism 33 input shaft 34 core shaft 35 outer tube 36 arm 37 universal joint 38 knob 39 guide rod

Claims (4)

[Claims] 1. An ultrasonic transmission oblique probe and an ultrasonic reception oblique probe which are arranged at required intervals on the left and right sides are attached to front and rear holding plates extending in the left and right direction so as to be adjustable in distance, The left and right support ends of the front and rear holding plates are supported by left and right support plates having magnet wheels to form a holder body, and a fixing plate is provided between the center portions of the front and rear holding plates, and the fixing plate is An ultrasonic probe scanning holder having a structure in which an arm is rotatably mounted. 2. A bevel gear for ultrasonic transmission and an oblique probe for ultrasonic reception, which are arranged at a required interval on the left and right, are held by holding plates facing left and right. A screw shaft extending in the left-right direction and a guide rod extending in the left-right direction are disposed through the front and rear portions of the left and right holding plates, and both ends of the screw shaft and the guide rod in the left-right direction have magnet wheels. The input shaft of the bevel gear mechanism is projected on the guide casing of the bevel gear mechanism which is supported by the left and right support plates to form a holder main body, and is bridged between the screw shaft and the guide rod. An ultrasonic probe scanning holder characterized by having an arm attached via a universal joint. 3. The ultrasonic probe scanning holder according to claim 1, further comprising a spring for pressing and urging the probe downward. 4. The arm connected to the universal joint has a double structure consisting of a core shaft and an outer tube, the leading end of the core shaft is connected to the universal joint, and a knob is provided at the rear end of the core shaft. Ultrasonic probe scanning holder as described.