JPS60621B2 - Capillary flaw detection device - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a tube flaw detection device.

Conventional deep damage devices for cable pipes in steam generators of nuclear power plants include tube plate installation type, tube plate walking type, and center arm type, but all of these devices have a large water chamber. The problem is that it is difficult to apply to steam generators that have small water chambers.

The present invention addresses the above-mentioned problems, and includes a support arm that is fixed at a predetermined location on a device under test having a pongee tube at its rear end, and a support arm that is attached to the front end of the support arm so as to be able to rise and fall freely. a supporting case for the pivot shaft, a lifting operation mechanism for operating the case in the raising and lowering direction from the rear end of the support arm, a plywood supported on the case so as to be able to swing in the horizontal direction via the pivot shaft, and the plywood. A carriage supported so as to be able to reciprocate upward, an arm supported on the carriage so as to be able to pivot horizontally, a flexible operating member whose front end side is attached to the arm so as to be able to move up and down, and the operating member. The present invention relates to a pongee tube flaw detection device characterized by comprising a drive device that drives the rear end side in a forwarding direction and a retracting direction, and a flaw detection probe attached to the front end of the operating member. , can be applied to small-sized devices under test.

All tubules can be examined. Another object of the present invention is to provide an improved tube flaw detection device that can eliminate work inside the equipment to be inspected that involves radiation exposure accidents. The capillary deep wound device of the present invention is configured as described above, and the plywood, the carriage, and the arm are pivoted in the horizontal direction about the pivot axis and moved above the support arm. Thereafter, by operating the raising and lowering operation mechanism to lower the case, the pivot shaft, the plywood, the carriage, and the arm, these parts can be folded onto the support arm.

In addition, the device folded in this way is inserted into the device under test, the rear end of the support arm is fixed at a predetermined location on the device under test, and then the raising/lowering operation mechanism is operated to move the case and the After raising the pivot shaft, the plywood, the carriage, and the arm so that the carriage is parallel to the tube plate to which the pongee pipe is attached, move the plywood, the carriage, and the arm to the pivot shaft. By rotating the carriage and the arm in the horizontal direction, by reciprocating the carriage and the arm, and by rotating the arm in the horizontal direction, the flaw detection probe can be moved to a position directly below each capillary. . Further, when moving in this manner, if the drive device is driven to send out the operating member, the flaw detection probe can be inserted into the pongee tube and inspection can be performed. The pongee tube flaw detection device of the present invention is foldable as described above, and can be applied to small-sized equipment to be inspected.

In addition, the area near bulkheads installed inside the equipment to be inspected is narrow, and simply rotating the carriage horizontally or reciprocating as described above will not allow the flaw detection probe to be placed directly under the pongee pipe near the bulkhead etc. difficult to move into position,
As described above, it has an arm that pivots horizontally around the base end, and the flaw detection probe can be moved to a position directly below the thin tube. Therefore, all cord pipes can be inspected. Furthermore, when this capillary flaw detection device is inserted into the equipment under test, the fixing and raising and lowering of the case are performed outside the equipment under test, and the turning movement of the plywood and the carriage about the pivot axis, Since the reciprocating movement of the carriage and the pivoting movement about the base end of the arm are remotely controlled from outside the device under test, it is possible to eliminate work inside the device under test that involves exposure to radiation. Next, the thin tube flaw detection device of the present invention will be explained with reference to an embodiment shown in FIGS. 1 to 4. In FIG. 1, 1 is a steam generator;
3 is a tube plate provided in the steam generator 1, and 4 is a pongee pipe provided in the tube plate 3.

Reference numeral 5 denotes the main capillary deep injury device, which will be explained next. 6 is a support arm, 7 is a pedestal provided at the rear end of the support arm 6, 8 is a guide bolt attached to the pedestal 7, and the guide bolt 8 is fitted into a screw hole on the manhole 2 side, while
By supporting the pedestal 7 on the outer peripheral surface of the manhole 2, the support arm 6 is fixed in the state shown in FIG.

In addition, 9 and 9 in FIGS. 192 and 3 are rotating shafts attached to the front end of the support arm 6, 10 is a rotating shaft fixed to each rotating shaft 9, and a support case for the drive device, and FIGS. Reference numeral 11 in the figure shows a swing ball, 12 and 13 in FIG.
is a support plate provided in the case 10, 15 is a motor attached to the support plate 14, 16 is a gear fixed to the output shaft of the motor 15, and 17 is fixed to the pivot shaft 11 by a key 18. 19 is a gear, 20 is a rotation detector attached to the support plate 14, and when the motor 5 is started in the positive or negative direction, the rotation is detected by the gears 16, 1.
7 to the pivot shaft 11 so that the pivot shaft 11 rotates in the positive or negative direction, and the rotation is transmitted to the gear 1 through the gear 1.
6 and 19 to the rotation detector 20, and the amount of rotation is detected. Further, 21 in FIG. 1 is a plywood plate fixed to the upper part of the pivot shaft 11, 22 is a guide shaft with one end fixed to the plywood 21, and 23 is a connecting village connecting the ends of each guide shaft 22. 24 is a feed screw shaft rotatably supported by the plywood 21 and the connection village 23; 25 is a gear fixed to the feed screw shaft 24; 26 is a motor attached to the plywood 21; A gear (not shown) attached to the output shaft of the gear 25 is
It meshes with the Further, 27 is a carriage which is attached to each of the guide shafts 22 and connected to the feed screw shaft 24, 28 is a gear meshed with the gear 25, and 29 is a feed amount detector attached to the plywood 21. , the motor 26
When the gear 25 is started in the positive or negative direction, the rotation of the gear 25
The rotation is transmitted to the feed screw shaft 24 through the gears 25 and 28 so that the carriage 27 moves forward or backward along the guide shafts 22 and 22, and the rotation is transmitted to the feed ink detector 2 through the gears 25 and 28.
9, and the feed amount is detected. Further, 30 is an arm rotatably attached to the carriage 27, 31 is a motor for horizontally rotating the arm 30, 32 is a detector for detecting the amount of rotation of the arm 30, and 33 is the arm A guide pipe 34 is attached to the tip of the guide pipe 30, and a flexible tube 35 extends from the guide pipe 33 in the direction of the pusher 36.
is the guide pipe 33 and the flexible tube 3.
A cord tube 37 is attached to one end of the cord tube 35 and has one end extending upward from the guide pipe 33 and the other end extending backward from the flexible tube 34. 38 is a feed roller for the cord tube 35 provided on the pusher 36, 39 is a motor for driving the feed roller 38, and 40 is a code tube 35 provided behind the feed roller 38. When the motor 39 is started in the positive or negative direction with the take-up reel, its rotation is transmitted to the feed roller 38, and the cord tube 35 advances and retreats within the guide pipe 33 and flexible tube 34, and the flaw detection probe 37 is inserted into and removed from the pongee tube 4, and the rotation of the roller 38 is transmitted to a feed amount detector (not shown) that converts the amount of rotation into a feed amount, so that the pongee of the flaw detection probe 37 is inserted into and removed from the pongee tube 4. The amount of insertion into the tube 4 is detected. Further, 41 in FIGS. 1, 2, and 3 is a lever for raising and lowering fixed to one of the rotating shafts 9, 9, 42 is a stopper fixed to the support arm 6, and 43 is attached to the tip of the bar 41 mentioned above. a winding reel 4 for the wire 43, the wire 44 being attached to the support arm 6;
5 is a handle for driving the take-up reel 44 attached to the base 7; 46 is a motion conversion gear provided between the handle 45 and the take-up reel 44; When the wire 43 is wound onto the take-up reel 44, the levitation lever 41 rotation shaft 9, 9 support case 10 rotation shaft 11 plywood 21 and the parts 22 to 33, 35, and 37 attached thereto is erected around the rotating shafts 9, 9, and when the levitating lever 41 hits the stopper 42 due to this erecting, the carriage 27 becomes parallel to the tube plate 3. In addition, the motor 5 is started, and the rotating shaft 11 plywood 21 and the 22 attached thereto are
After rotating the parts 33, 35, and 37 horizontally around the pivot shaft 11 and moving them above the support arm 6,
When the handle 45 is rotated in the other direction and the wire 43 is let out from the take-up reel 44, the undulating lever 41 rotating shaft 9, 9 supporting case 10 turning ball 11 plywood 21 and the wires 22 to 33 attached thereto , 36, 37 is the rotation axis 9
, 9 by its own weight and folded onto the support arm 6. In the figure, reference numeral 47 is a flaw detection signal lead wire, 48 is a control lead wire for the pusher 36,
49 is a control lead wire for each motor and each detector.
Next, the operation of the narrow tube deep wound device will be explained with reference to FIGS. 5 to 8.

Generally, the water chambers of a steam generator are divided by five central partition walls, each having a 1'4 spherical shape, with one water chamber designated as the COLD side water chamber and the other as the HOT side water chamber. I'm calling. When inspecting the thin tube 4 in the water chamber on the COLD side, a pongee tube deep wound device with a support arm 6a is inserted into the water chamber from the manhole 2 in a folded state as shown in FIG. 5A. Also, when inspecting the pongee pipe 4 of the HOT side water chamber,
With the pongee pipe flaw detection device with the support arm 6b extended from the manhole 2 to the same water chamber as shown in the opening in Fig. 5, that is, by slightly rotating the handle 45 in the upright direction, the hoisting lever 41 is rotated. Axis 9, 9 Support case 10 Swivel hoe 11 Plywood 21
and the portions 22 to 33, 35, and 37 attached thereto are slightly erected around the rotating shafts 9, 9, while the "motor 1"
5, the pivot shaft 11 plywood 21 and the parts 22 to 33, 35, and 37 attached thereto are pivoted in the horizontal direction about the pivot shaft 11, and these parts are moved to the support arm 6.
Insert it in an extended state relative to b. Once inserted in this manner, the support arm 6 (6a or 6b) is fixed to the outer peripheral surface of the manhole 2 by the base 7 and the guide bolt 8, and then the handle 45 is moved to the final position, that is, the undulation lever 41 contacts the stopper 42. Rotate to the position and press each part 1 above.
0, 11, 22 to 33, 35, 37 are completely erected to make the carriage 27 parallel to the tube plate 3. After that, start the motor 26 and move the carriage 27 onto the guide shaft 22.
Then, the carriage 27 is moved in the direction (R) in FIGS. 7 and 8 along the feed screw shaft 24, the motor 15 is started again, and the carriage 27 is moved in the direction (8) in FIGS. while moving the probe 37 directly under each thin tube 4,
The motor 39 is started, the cord tube 35 is drawn out, the probe 37 is inserted into the thin tube 14, and an inspection is performed. Also, the parallel hatched area in FIG. 8, that is, the vicinity of the partition wall 50 and the partition wall 5
The area near the joint between 0 and the water chamber wall is very narrow and difficult to inspect.
However, for this part, start the motor 31,
The arm 30 having the length (a) is rotated in the direction (Q) in FIGS. 7 and 8 to conduct the inspection. In addition, when the probe 37 moves only in the (R) and (8) directions, the position of each general pipe 4 and the position of the probe 37 arranged in a grid or staggered manner are determined, for example, by rectangular coordinates (x , y), but if the probe 37 also moves in the (Q) direction, the position of the probe 37 can be expressed as x=x.

−Rcos80xQy=y.

It is necessary to express it by 1Rsjna+yQ.

Here, xQ and yQ' are correction values based on the rotation of the arm 30. Further, control involving this correction may be performed by the control device illustrated in FIG. 9. Note that the device of the present invention can also be applied to a device for repairing thin tubes. Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of a capillary flaw detection device according to the present invention, Fig. 2 is a partially vertical front view of a support case for a pivot shaft, Its longitudinal side view,
Fig. 5 is an explanatory diagram showing the inserted state of the capillary deep wound device, Fig. 6 is an explanatory diagram showing the position of the deep wound probe, and Figs.
9 is a block diagram showing an example of a control device. FIG. 9 is a block diagram showing an example of the control device. 0 1... Equipment to be inspected, 2... Predetermined location, 4... Pongee pipe, 5... Pongee pipe flaw detection device, 6...
... Support arm, 10 ... Support case for pivot axis,
11... Rotating axis t 21... Plywood, 27...
...Carriage, 30...Arm, 35...
...Operating member, 36... Drive device "37...
... Probe for deep wounds, 9,41-46... Lifting operation mechanism. Public 2, Shio, 3, O, Sai, 4, Zuzu, 5, Juice, 6, Sai, 7, *8, Shio, Q,

Claims (1)

[Claims] 1. A support arm whose rear end has a thin tube and is removably fixed to a predetermined location on the device under test; a support case for a pivot shaft that is attached to the front end of the support arm so that it can be raised and lowered; an up-and-down operation mechanism operated from the rear end in the up-and-down direction; a base plate supported on the case so as to be able to pivot in the horizontal direction via the pivot shaft; a carriage supported on the base plate so as to be able to reciprocate; An arm supported so as to be able to rotate in the horizontal direction on the same carriage, a flexible operating member whose front end is attached to the arm so as to be able to move up and down, and a rear end of the operating member that is driven in the forwarding and retracting directions. 1. A capillary flaw detection device comprising: a drive device for detecting flaws; and a flaw detection probe attached to the front end of the operating member.