JPH0320775Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention holds a probe in a probe holder,
Insert and transport the test material into the center of the probe holder,
The present invention relates to a probe rotating type ultrasonic flaw detection device that performs flaw detection by rotating a probe holder around the test material at high speed.

[Prior Art] In general, among metal pipes, those that require high quality and high precision, such as extremely small diameter pipes used in nuclear power plants, are susceptible to damage such as scratches on the pipe or defects in the material. Strict ultrasonic dimension measurement is performed not only for the precise ultrasonic flaw detection of the steel, but also for the dimension measurement of its inner and outer diameters, wall thickness, etc. (hereinafter referred to as dimension measurement).

Conventionally, as an ultrasonic flaw detection device, a plurality of probes are held in a probe holder, a water chamber is formed, and the holder is rotated to move the probes around the test material. There is a method that performs high-density flaw detection by drawing a spiral scanning locus on the outer circumferential surface of the test material by rotating the test material and simultaneously transporting the test material in the length direction.

On the other hand, as an ultrasonic dimension measuring device, conventionally, it is installed in a water tank with an insertion hole in the side wall with an appropriate seal.
Place the measurement probe and rotate the material to be inspected.
Some items were inserted through the above-mentioned insertion hole and transported inside the aquarium to measure their dimensions.

[Problems to be solved by the invention] However, these conventional devices are mutually independent devices, and it is necessary to perform flaw detection and dimension measurement separately. Therefore, it is necessary to prepare the work for each one, which increases the amount of work, becomes complicated, and has the disadvantage that the time required for inspection also increases.

In addition, since conventional dimension measuring devices use a water tank, it is necessary to rotate the material to be inspected. Therefore, the number of rotations cannot be increased, making inspection time-consuming. There is.

The first purpose of this invention was to solve these drawbacks, and it is possible to perform flaw detection and dimension measurement at the same time, and only needs to set up the work in one time.
To provide a probe rotating type ultrasonic flaw detection device that reduces the amount of work, facilitates the work, and saves time for inspection.

Incidentally, the probe rotating type ultrasonic flaw detection apparatus has a structure in which a water chamber is provided in the probe holder and the probe is disposed on the peripheral wall of the water chamber. Therefore, the proximal end side of the probe is exposed on the outer periphery of the water chamber. Moreover, a coaxial cable is connected to the proximal end of the probe. Therefore, the drained medium water is
It is necessary to avoid adhesion to this part. In addition, since the probe holder rotates at high speed, if the coaxial cable connected to the base end of the probe is left exposed, it will be pulled outward by centrifugal force, and this will be repeated many times. If you change it, there is a risk of it breaking due to fatigue. Therefore, it is necessary to attach a holder cover to the outer periphery of the water chamber of the probe holder.

Moreover, this holder cover must be easily removable for purposes such as adjusting the water distance of the probe. In this case, if the probe holder is removed in a direction perpendicular to the rotation axis of the probe holder, the structure becomes complicated, so it is preferable to have a structure in which the probe holder is removed by sliding in the axial direction.

However, in the case of a structure in which the probe holder is removed by sliding in the axial direction, a non-rotating outer cover 34 is provided outside the probe holder, so a retraction space for the removed cover is required within the outer cover 34. In particular, in a flaw detection device in which the probe holder is long in the axial direction, there is a problem in that the outer cover 34 becomes longer in the axial direction including the retraction space of the holder cover.

The second purpose of the present invention was to solve these problems, and the second purpose of the present invention was to provide a rotating ultrasonic probe that can be attached and detached by sliding in the axial direction of the probe holder with a small amount of evacuation space. Our objective is to provide flaw detection equipment.

[Means for solving the problem] The present invention holds the probe in a probe holder,
Insert and transport the test material into the center of the probe holder,
In a rotating probe type ultrasonic flaw detection device that performs flaw detection by rotating a probe holder around the test material at high speed, as a means to solve the above problems, both ends of the probe holder and A partition wall is provided in each of the central parts to form a water chamber for flaw detection and a water chamber for dimension measurement, and a flaw detection probe is disposed in the former, while a dimension measurement probe is disposed in the latter. Cylindrical holder covers with different diameters are slidably attached in the axial direction to the outer periphery of the water chamber for flaw detection and the water chamber for dimension measurement of the probe holder, respectively. It is characterized by being configured to releasably cover the proximal end of the.

According to the above configuration, in the flaw detection device of the present invention, the water chamber for flaw detection and the water chamber for dimension measurement are provided in the probe holder.
They will be connected in the axial direction. In this case, the one with the larger outer diameter is placed on the proximal end side of the probe holder. This is to ensure rotational stability of the probe holder.

Further, according to the above configuration, the present invention includes cylindrical holder covers for the water chamber for flaw detection and the water chamber for dimension measurement. These holder covers are designed in accordance with the outer circumferential diameter of the water chamber for flaw detection and the water chamber for dimension measurement.
They are provided with different diameters. A large diameter holder cover is attached to the water chamber located on the proximal end side of the probe holder, while a small diameter holder cover is attached to the water chamber located on the distal end side of the probe holder.

When the large-diameter holder cover is removed from the water chamber to which it is attached, it can be retracted onto the small-diameter holder cover so as to cover its outer periphery.

[Operation] As shown in the above problem solving means, the present invention has the following features:
A water chamber for flaw detection and a water chamber for dimension measurement are formed in the probe holder, and the former is equipped with a flaw detection probe, while the latter is equipped with a dimension measurement probe. Dimensions can be taken at the same time. In this case, both water chambers are separated by a partition wall, and water distances suitable for each can be set. Moreover, the measuring water chamber can be set small.

Further, in the present invention, the holder cover is provided with different diameters corresponding to the diameters of the outer circumferences of the water chamber for flaw detection and the water chamber for dimension measurement. Then, a large diameter holder cover is attached to the outer circumference of the water chamber located on the proximal end side of the probe holder, and a small diameter holder cover is attached to the outer circumference of the water chamber located on the distal end side of the probe holder. There is. Therefore, when removing the large-diameter holder cover, the cover is slid in the axial direction so that it overlaps the outside of the small-diameter holder cover. On the other hand, the small-diameter holder cover is retracted into a retraction space provided in advance on the tip side of the probe.

Therefore, in the present invention, the water chamber for flaw detection and the water chamber for dimension measurement are arranged in series in the axial direction, but the required evacuation space only needs to be long enough to evacuate the small diameter holder cover, and two chambers are required. The length shall not be so long as to cover the entire length.

[Example] An example of the present invention will be described with reference to the drawings.

<Configuration of Example> Figure 1 is a perspective view showing the external appearance of a rotating probe type ultrasonic flaw detection device to which this example is applied, Figure 2 is a side view thereof, and Figure 3 is a diagram showing the appearance of a rotating probe type ultrasonic flaw detection device to which this example is applied. Figure 4 is a cross-sectional view showing the probe holder, which is the main part of this embodiment, and Figure 5 is a perspective view showing the appearance of the probe holder with the holder cover attached, which is the main part of this embodiment. FIG. 6 is an explanatory view showing the arrangement of the probes in the flaw detection apparatus of this embodiment, and FIG. 7 is a sectional view showing the attachment and detachment of the holder cover, which is the main part of this embodiment.

First, a rotating probe type ultrasonic flaw detection apparatus shown in FIGS. 1 and 2 will be described.

In these figures, each part of the ultrasonic flaw detection apparatus to which this embodiment is applied is arranged in a straight line on the top surface of a pedestal 10, and the apparatus main body 12, which performs rotational drive and electrical connection of signals, is installed in the center. A probe holder portion 13 is connected to one end of the main body 12, and conveying devices 16 and 18 for conveying the test material P are provided at both ends of the pedestal 10 in the longitudinal direction. These devices are arranged with their central axes aligned so that the test material P can be transported without bending.

Probe holder 14 inside probe holder part 13
As shown in FIG.
2. Consists of a flaw detection section 24 and a medium introduction section 26,
The overall structure consists of multiple cylinders with different diameters stacked concentrically. Partition walls 28, 30 and 32 are provided at the boundary between each cylinder. These parts are parts that rotate at high speed, and non-rotating parts such as the outer cover 34 that do not rotate are provided outside of these parts.

The outer cover 34 has an upper half 34a with a hinge 34b.
The upper half of this 3
4a can be locked by a locking mechanism 34c to prevent it from opening due to vibration or the like.

A water chamber 36 for size measurement and a water chamber 38 for flaw detection are provided by the partition walls 28, 30, and 32. In addition, at the center of each of the partition walls 28, 30 and 32,
Through holes 40, 42 and 44 are provided concentrically. These through holes 40, 42 and 44 include
Positioning bushings 4 each precisely machined so that the center coincides with the center of the probe holder 14 and the inner diameter is approximately equal to the outer diameter of the test material P.
6, 48 and 50 are fitted.

The dimension measurement section 22 includes dimension measurement probes 52 and 54,
A temperature compensation probe 56 (see FIG. 6) and a reflection plate 58 are arranged with their ends facing the measurement water chamber 36. The probes 52, 54, 56 are held and mounted by appropriate holding members. For example, the probes 52 and 54 are held and fixed at their positions while adjusting the water distance using a holding member 60 as shown in FIG.

The flaw detection section 24 includes flaw detection probes 62, 64, 6.
6 and 68 are arranged with each end facing the water chamber 38 for flaw detection. Note that the flaw detection probe 68 is
Although it is located in front of the cut plane and should not originally appear in the cross-sectional view of FIG. 3, it is shown in the same figure to show its position.

These flaw detection probes 62, 64, 66, and 68 are set obliquely with respect to the center of rotation in order to cause the ultrasonic waves to be obliquely incident on the test material P. This probe also allows adjustment of the water distance and angle using a suitable holding member. For example, the flaw detection probes 62 and 64 are held by holding members 70 and 72 such that the water distance and angle can be adjusted.

The mounting portion 20 is formed in a flange shape on the outside of the partition wall 28 and is fixed to a mounting portion 74 formed in a flange shape on the main body 12 side with a plurality of bolts 76 . A probe 5 is attached to this mounting portion 20.
A plug 78 of a connector for connecting a coaxial cable 77 leading to a second etc. is provided corresponding to the probe.

On the other hand, the plug 78 is provided on the main body 12 side.
A receptacle 80 is provided in the mounting portion 74 correspondingly. A coaxial cable 82 connected from this receptacle 80 is connected to a signal transmitting/receiving section (not shown) such as a capacitor coupling that electrically connects the stationary side and the rotating side. In addition, the mounting part 74
is connected to the rotor 84 at its center.
The rotor 84 is rotationally driven by an electric motor and a power transmission means (both not shown) housed in the pedestal 10, and rotates the probe holder 14 at high speed via the mounting portion 74. Furthermore, this rotor 84
A guide member 86 for positioning the test material P at the center of rotation is inserted through the center.

The medium introduction part 26 provided at the end of the probe holder 14 is fixed to the partition wall 32 with bolts 88. A groove 9 is provided on the outer periphery of this medium introducing portion 26.
0 is provided, and a water guide portion 92 that communicates with the water chamber 38 for flaw detection from a proper location of this groove 90 is provided. Further, a water guide hole 93 is also provided in the partition wall 30 so that the water chamber 38 for flaw detection and the water chamber 36 for size measurement are communicated with each other. The groove 90 is formed in the non-rotating case 9.
4, and a medium (usually water) is injected under pressure from a medium inlet 96 provided in the case 94.

Further, in the above embodiment, a cylindrical holder cover 9 is provided on the outer periphery of the dimension measuring section 22 and the flaw detection section 24, respectively.
8,100 are installed. Holder cover 98
The holder cover 100 is formed to have a large diameter and is attached to the outer periphery of the measuring section 22, and the holder cover 100 is formed to have a small diameter and is attached to the outer periphery of the flaw detection section 24. The outer diameter of the holder cover 100 is smaller than the inner diameter of the holder cover 98.
can be layered on the outside.

Each of these holder covers 98 and 100 is provided with a locking hole 102 at a suitable position near the opening on the outer periphery thereof. One or more locking holes 102 are provided around the entire periphery of the holder covers 98 and 100, respectively.

Correspondingly, the dimension measuring section 22 and the flaw detection section 24
A ball plunger 104 is disposed at a suitable location on the outer periphery of. The ball 106 of the ball plunger 104 engages with the locking hole 102 to prevent the holder covers 98 and 100 from moving and rotating in the axial direction.

In addition, the outer cover 34 and the probe holder 14 inside the outer cover 34 are connected to the medium introduction part 26 as shown in FIG.
A retraction space 108 for the small diameter holder cover 100 is provided on the outside of the holder. The axial length of this space is sufficient as long as it can accommodate the small diameter holder cover 100.

<Operation of the embodiment> The operation of the embodiment configured as described above will be explained with reference to the above-mentioned figures.

First, the rotor 84 is rotated by an electric motor (not shown) to rotate the probe holder 14 at high speed.
Further, water as a medium is injected into the probe holder 14 from the medium inlet 96. This injection is performed by connecting a pipe to the medium inlet 96. The injected water reaches the water chamber 38 for flaw detection and the water chamber 36 for dimension measurement from the appropriate place in the groove 90 through the water guide section 92, filling them, and the overflowing water flows through the drain 110 and the water chamber 36, as shown in FIG. 112 to probe holder 14
It is discharged to the outside.

On the other hand, the test material P is inserted into the guide member 86 in the rotor 84 from the tip by the conveyance device 16, and is further inserted into the partition walls 28, 30 and 3 of the probe holder 14.
Bushings 46, 48 and 50 provided in 2
The paper is sequentially inserted into the paper, reaches the transport device 18, and is transported at a constant speed in the direction of arrow A in FIG.

Dimension measurement and flaw detection are started when the approach of the tip of the test material P is detected by a proximity sensor such as a limit switch (not shown).

Dimension measurement involves emitting ultrasonic waves perpendicularly to the specimen P from the dimension measurement probes 52 and 54, measuring the time it takes for the echo to return, and determining the outer diameter and inner diameter of the specimen P. Measure dimensions, wall thickness, etc.

Note that this measurement is likely to cause errors due to changes in the speed of sound due to changes in the temperature of the medium. Therefore, in this embodiment, temperature compensation is performed.

This temperature compensation is performed using a temperature compensation probe 56 and a reflecting plate 58 that faces the temperature compensation probe 56 with a certain distance therebetween.
This is done by That is, the temperature compensation probe 5
The change in sound speed and temperature in the time required for the ultrasonic waves emitted from the probe 56 to be reflected by the reflection plate 58 and detected again by the temperature compensation probe 56 is detected, and thereby the measurement probe Correct the signal from the child to remove the effects of temperature changes.

In flaw detection, ultrasonic waves are emitted obliquely from the flaw detection probes 62, 64, 66, and 68 to the test material P, and are reflected back at the interface of the flaws or defects inside the test material P. This is done by detecting incoming ultrasonic echoes. In this flaw detection, since the probe holder 14 is rotating at high speed, the four probes 62, 64,
Flaw detection is performed using four spiral scanning trajectories 66 and 68.

In this way, in this example, dimension measurement and flaw detection are
Since the materials to be inspected are conveyed only once and the inspection is carried out simultaneously, it is possible to significantly reduce the working time.

In addition, in this embodiment, cylindrical holder covers 9 are provided on the outer peripheries of the dimension measurement section 22 and the flaw detection section 24, respectively.
Since the probes 8 and 100 are attached, the probes 62 and 6 attached to the dimension measurement section 22 and the flaw detection section 24 are
4, 66 and 68, and dimension measurement probes 52, 54
, temperature compensation probe 56 , and coaxial cable 77
and are protected from wetting by ingress of couplant.

Moreover, the coaxial cable 77 is connected to the probe holder 1.
Even if the probe holder 14 is pushed toward the outer circumferential direction by the centrifugal force accompanying the high-speed rotation of the probe holder 4, the probe holder 14 is blocked by the holder covers 98, 100, and is not displaced further outward. Therefore, the coaxial cable 77 is prevented from being broken due to being pulled outward or repeatedly being pulled outward.

When adjusting the water distance of the probe, etc., when the probe holder 14 is stationary, first remove the locking mechanism 34c and open the upper half 34a of the outer cover 34. Then, the holder covers 98, 100 are removed by pulling them out in the axial direction.

For example, when the holder cover 98 is pulled in the axial direction,
Ball 106 of ball plunger 104 is pushed out of engagement with locking hole 102 against the force urging it outward. As a result, the holder cover 98 can be easily slid in the axial direction and removed. At this time, the holder cover 98 was removed.
overlaps the outside of the holder cover 100 and is in a retracted state.

On the other hand, when removing the holder cover 100, the same procedure as described above is performed, but the removed holder cover 100 is stored in the evacuation space 108. Note that the holder cover 9 is placed in this evacuation space 108.
8,100 may be stored.

In this manner, the holder covers 98, 100 are removed and necessary adjustments such as water distance adjustment and radiation angle adjustment are made to the probe.

After the adjustment, the removed holder covers 98, 100 are moved from the retracted position to their respective mounting positions, contrary to the case of removal described above. At this time, the ball 106 of the ball plunger 104 is inserted into the locking hole 102.
Continue pressing until it is inserted into the slot.

In addition, in this example, during dimension measurement and flaw detection,
The material to be inspected P is placed between the partition walls 28, 30 and 32 at three locations.
The probe holder 14 is restrained by bushings 46, 48, and 50 attached to the probe holder 14, so that dimension measurements and flaw detection are performed with its central axis substantially coinciding with the center of rotation of the probe holder 14. Therefore, it is possible to accurately measure dimensions and detect flaws even for specimens having a small diameter such as extremely small diameter pipes. In this embodiment, these bushings 46, 48, and 50 have tapered openings, so when inserting the tip of the material to be tested, there is no collision with the tip, and the insertion is easy. can do.

<Modification of the embodiment> In the above embodiment, a through hole is provided in the center of the partition wall of the probe holder, and a positioning bushing is fitted into the through hole, but the through hole itself is precisely machined to form a guide hole. , and the bushing may be omitted.

Further, in this embodiment, four flaw detection probes are used, but of course the number is not limited to this.

Further, in the above embodiment, a cylindrical holder cover is used, but other forms may be used. In addition, although a ball plunger is used to lock the holder cover, other means may be used.

[Effects of the invention] As explained above, the present invention can perform flaw detection and dimension measurement at the same time, requires only one work setup, reduces the amount of work, and facilitates the work. Inspection does not take much time, and even if the flaw detection section and the measurement section are connected, the holder cover can be attached and detached by sliding in the axial direction of the probe holder with little evacuation space. .

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the external appearance of a rotating probe type ultrasonic flaw detection device to which this embodiment is applied, Fig. 2 is a side view thereof, and Fig. 3 is a main part of the probe to which this embodiment is applied. 4 is a sectional view showing the probe holder; FIG. 4 is a perspective view showing the appearance of the probe holder with a holder cover attached, which is the main part of this embodiment; FIG. 5 is an enlarged sectional view of the main part; The figure is an explanatory view showing the arrangement of the probes in the flaw detection apparatus of this embodiment, and FIG. 7 is a sectional view showing the attachment and detachment state of the holder cover, which is the main part of this embodiment. P... Test material, 10... Frame, 12... Device main body, 14... Probe holder, 16, 18... Transport device, 20... Mounting section, 22... Dimensions section, 24...
...Flaw detection section, 26...Medium introduction section, 28, 30, 3
2... Bulkhead, 34... Outer cover, 36... Water chamber for dimension measurement, 38... Water chamber for flaw detection, 40, 42, 44...
...Through hole, 46, 48, 50...Butting, 5
2, 54...Dimension measurement probe, 56...Temperature compensation probe, 58...Reflection plate, 60...Holding part, 6
2, 64, 66, 68...flaw detection probe, 70,
72...Holding member, 74...Mounting portion, 77...Coaxial cable, 98, 100...Cover, 102...
... Locking hole, 104 ... Ball plunger, 10
6...Ball, 108...Evacuation space.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A probe is held in a probe holder, a test material is inserted into the center of the probe holder, and the test material is conveyed, and the probe is placed around the test material. In a rotating probe type ultrasonic flaw detection device that performs flaw detection by rotating the child holder at high speed, partition walls are provided at both ends and the center of the probe holder, and a water chamber for flaw detection and a water chamber for dimension measurement are provided. The former is equipped with a flaw detection probe, while the latter is equipped with a dimension measurement probe, and the outer periphery of each of the flaw detection water chamber and dimension measurement water chamber of the probe holder is The probe is characterized in that cylindrical holder covers with different diameters are attached so as to be slidable in the axial direction, and are configured to cover the proximal ends of the flaw detection probe and the dimension measurement probe in a releasable manner. Rotating probe ultrasonic flaw detection device. (2) The probe rotating type ultrasonic flaw detection device according to claim 1, wherein the holder cover is cylindrical and a ball plunger is used to lock the holder cover.