JPH0245812Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a self-propelled flaw detection device that is inserted into the gap between the reactor vessel and the guard vessel of a fast breeder reactor and inspects the reactor vessel and the guard vessel using ultrasonic flaw detection.

Conventionally, self-propelled flaw detection equipment for reactor vessels and guard vessels in fast breeder reactors has been developed using Utility Application No. 57-009958 (utility model registration number) as shown in Figures 1 and 2.
No. 1793905, Publication No. 1-8449) are known.

In the figure, 100 is the main body of the self-propelled flaw detection device,
It is inserted between the outer pipe or guard vessel 101 and the inner pipe or furnace vessel 102. Drive roller 10
3 contacts the inner piping or the surface of the furnace vessel 102, and extends the main body 10 in the axial direction (left and right direction in FIG. 2).
0, and is attached to the end of the connecting shaft 104 of the main body 100 at two locations.
The rotational drive of the main body 100 is achieved by transmitting the rotational force of a drive motor 105 mounted in the main body 100 to a pulley 106, a chain 107, and a pulley 108, and a bevel gear 109 attached to the same axis as the pulley 108, Matching bevel gear 110,
It is also transmitted to a pulley 111 mounted on the same axis as this bevel gear 110. Further, the rotational force is transmitted through the chain 112,
Pulley 11 attached and fixed to connecting shaft 104
3. Thus, the rotational force of the drive motor 105 rotates the drive roller 103 via the above system.

Further, the rotational force of the drive motor 105 is simultaneously transmitted to the pulley 106 and the chain 114.
15. This pulley 115 is disposed diagonally at 90 degrees with respect to the drive roller 103, and the diagonal drive roller 115 is disposed on the opposite side of the main body 100.
6 is attached to a rotating shaft 117 attached at both ends, the rotational force of the drive motor 105 is also transmitted to the diagonal drive roller 116. This diagonal drive roller 116 causes the main body 100 to move in the circumferential direction (left-right direction in FIG. 1). on the other hand,
Two cylinders 118 are attached to the main body 100, and one each of a rotatable driven roller 121 and a diagonal driven roller 122 are attached to both sides via piston rods 119 and 120. There is one rotary roller 123 on the inner piping or furnace vessel 102 side of the main body 100 that is rotatable in the same direction as the drive roller 103, and on the outer piping or guard vessel 101 side is rotatable in the same direction as the diagonal drive roller 116. One diagonal rotating roller 124 is attached to each of the two. In addition, in the figure, 125
is an inspection probe for inspecting the outer piping or the guard vessel 101 side, and is designed so that it can be pressed against the inner surface of the outer piping or the guard vessel 101 via its piston rod 127 by a pressing cylinder 126 attached to the main body 100. It's summery.

Therefore, in order to move and inspect the inner piping or the furnace vessel 102 in the axial direction using the self-propelled flaw detection device configured as described above, the piston rod 119 is moved upward in FIG. The roller 121 is attached to the outer pipe or the inner surface of the guard vessel 101, and the drive roller 10
3 and the rotating roller 123 to the inner piping or furnace vessel 102.
Press it against the outer surface of the In this way, even if the double pipe or double wall surface is arranged vertically, or even if the double pipe is horizontally arranged, self-propelled flaw detection movement is possible by rotating the drive motor 105 at any position in the circumferential direction of the double pipe.

Next, in order to perform a movement inspection in the circumferential direction, the cylinder 11
By moving the piston rod 120 downward in FIG.
22 on the inner piping or on the outer surface of the furnace vessel 102, and the diagonal drive roller 116 and the diagonal rotating roller 12.
4 against the outer pipe or the inner surface of the guard vessel 101. At this time, the driven roller 12
1. Drive roller 103 and rotating roller 123
is away from the pipe wall. As a result, drive motor 1
05 in the same manner as described above, the main body 100 can be moved in the circumferential direction of the pipe or the furnace vessel 102.

Here, even if the arrangement of the drive roller 103 and the like in the above configuration is reversed, the same operation can be achieved, and it is also possible to install the inspection probe 125 on the inner piping or the furnace vessel 102 side.

However, in the above-mentioned apparatus, when performing a scan necessary for ultrasonic flaw detection of a welded part as shown in FIG.
8 had to be activated, making the operation complicated and requiring a long inspection time.

Further, when the direction is changed, the inspection probe 125 moves away from the pipe wall surface, although it is instantaneous, so there is a drawback that highly accurate inspection cannot be performed.

The present invention was made to eliminate the above-mentioned conventional drawbacks, and improves the operability of a self-propelled flaw detection device that performs ultrasonic flaw detection by inserting into the gap between the reactor vessel and the guard cell of a fast breeder reactor. In addition, with the aim of shortening inspection time, we added a mechanism that allows the inspection probe to touch and trace the surface to be inspected perpendicular to the moving direction of the self-propelled device, and a rotation mechanism for the inspection probe. The present invention provides a self-propelled flaw detection device characterized in that it is configured to perform flaw detection on both sides without performing a direction change operation.

Embodiments according to the present invention are shown in FIGS. 4 to 5 below.
This will be explained in detail based on the figures.

FIG. 4 shows an embodiment according to the present invention, and FIG. 5 is a sectional view showing the main parts around the inspection probe shown in FIG. 1, and FIG. 5 is a plan view thereof. The rest is the same as the self-propelled flaw detection apparatus shown in FIGS. 1 and 2, and the same parts and parts corresponding to the conventional apparatus will be described with the same reference numerals.

First, a part of the main body 100 of the self-propelled flaw detection device is formed into a concave shape, and the ball screw 2 is rotatably attached via bearings 1a and 1b. A gear 3 is fixed to one end of the ball screw 2, and meshes with a gear 6 fixed to the output shaft of a motor 5 attached to the main body 100 via a pedestal 4.

Further, the scanner 7 has a built-in ball nut (not shown) for moving the rotation of the ball screw 2 in the direction of arrow X, and also has a built-in guide bearing for preventing the scanner 7 from rotating. The guide bearing (not shown) moves along the guide shaft 8 attached to the main body 100. A pressing cylinder 126 is attached to the scanner 7 to make the inspection probe 125 come into contact with the wall surface of the outer pipe or the guard vessel 101. This cylinder 126 moves the piston rod 127a in the direction of arrow Z, and the end of the piston rod 127a moves in the direction of arrow Z. The inspection probe 125 attached to the wall of the guard vessel 101 can come into contact with the outer piping or the wall surface of the guard vessel 101. A toothed portion is formed in a part of the piston rod 127a, and a gear 9 that meshes with the toothed portion is formed.
is attached to the output shaft of the motor 11, which is fixed to the cylinder 126 via the pedestal 10.

Next, a case in which ultrasonic flaw detection is performed on the outer piping or the welded portion 101a of the guard vessel 101 using the self-propelled flaw detection device configured as described above will be described in detail. The self-propelled device reciprocates by repeatedly moving in the direction of arrow Y in FIG. At this time, if the inspection probe 125 is moved by the motor 5 in the direction of the arrow X by a distance equivalent to one pitch for each outward and return trip, the test can be carried out without changing the direction of the self-propelled device on both sides of the welding part 101a. can.

In addition, in actual ultrasonic flaw detection, the direction α of the ultrasonic waves incident on the welding part 101a from the inspection probe 125 needs to be carried out from both directions of the welding part 101a, but in this embodiment, the motor 11 is By actuating the inspection probe 12
5 can be rotated 1/2 turn, so after that operation, ultrasonic flaw detection on both sides can be performed by simply operating in the same manner as described above (however, the pitch feed direction is opposite to that described above), and even in that case, self-propelled There is no need to perform a direction change operation of the device.

As explained in detail above, according to the self-propelled flaw detection device according to the present invention, the pitch feed mechanism for scanning is built into the self-propelled device, and the rotation mechanism for the inspection probe is added to the pitch feed mechanism. By inserting it into a gap in a heavy wall surface, it is possible to perform flaw detection on both sides of a welded part at once without changing direction. Therefore, the only operations required to perform ultrasonic flaw detection are the unidirectional reciprocating motion and pitch feeding motion of the self-propelled device, which greatly improves operability and shortens inspection time. The positional accuracy associated with this can be greatly improved.

Furthermore, if the above mechanism is attached to the opposite surface to be inspected, it becomes possible to perform ultrasonic flaw detection on both wall surfaces at the same time, resulting in even more dramatic effects.

[Brief explanation of drawings]

Fig. 1 is a front view of a self-propelled device showing a conventional embodiment, Fig. 2 is a side view thereof, Fig. 3 is an explanatory diagram when scanning is performed by a conventional self-propelled device, and Fig. 4 is an illustration of the present invention. FIG. 5 is a sectional view of the area around the inspection probe showing such an embodiment, and FIG. 5 is a plan view of FIG. 4. In the drawings, 1a, 1b...bearing, 2...ball screw, 3...gear, 4...pedestal, 5...motor,
6... Gear, 7... Scanner, 8... Guide shaft, 9... Gear, 10... Pedestal, 11... Motor, 100... Main body of flaw detection device, 101... Outer piping, 101a... Welded part , 125... inspection probe, 126... cylinder, 127a... piston rod.

Claims (1)

[Scope of utility model registration request] In a self-propelled flaw detection device that is inserted into a gap between double piping or a double wall surface and is movable in one direction and a direction perpendicular thereto, the device is installed orthogonally to the Y direction, which is the one direction. a scanner that is screwed onto a ball screw and moves in the X direction perpendicular to the Y direction as the ball screw rotates; A self-propelled flaw detection device comprising: a cylinder that moves an inspection probe for flaw detection using acoustic waves or the like in the Z direction to approach and separate from the test surface of the double pipe or double wall surface.