JPS645250Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device that allows an automatic ultrasonic probe drive device for flaw detection of pipe welds to be attached to and detached from a pipe with a simple operation.

Generally, in order to non-destructively and automatically inspect a pipe weld for internal defects using ultrasonic flaw detection, a probe drive mechanism is required to irradiate the entire circumference of the pipe weld with ultrasonic waves. This probe drive mechanism normally includes one to three probes, a probe holder, one servo motor each for moving the probe in the axial direction and circumferential direction of the pipe, and a 1 position detector each for detecting the axial and circumferential positions of the tentacles
There are cases in which the entire drive mechanism is reciprocated in the axial or circumferential direction of the piping while the probe scans, and in other cases the probe is scanned in the axial direction while the entire driving mechanism is gently moved in the circumferential direction of the piping. There are cases where scanning is performed by moving the drive mechanism back and forth, but in either case, a mechanism is required to hold the entire drive mechanism in the pipe.

Conventionally, the drive mechanism is held on the piping by attaching a guide such as a rail in the circumferential direction near the part of the piping to be inspected, and attaching a holding mechanism for the piping to this guide. Then, after attaching the two-piece guide to the pipe and fixing it with set screws, etc., the drive mechanism must be placed on the guide, and the holding mechanism must be attached to the guide, which is a complicated operation. This not only reduces workability and lengthens the inspection time as a whole, significantly deteriorating work efficiency, but also requires troublesome and time-consuming positioning when worn.

The object of this invention is to eliminate the above-mentioned drawbacks and provide a piping attachment/detachment device for an automatic ultrasonic probe drive device that can be attached to and detached from the piping with a simple operation and has high workability.

Examples of this invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a state in which the automatic ultrasonic probe drive device equipped with the attachment/detachment device of this invention is attached to a pipe;
11 is a welding part, 11 is a probe holder that constitutes a part of the probe drive mechanism, 12 is a probe, 10 is a holding frame that accommodates the probe drive mechanism and a pipe holding mechanism, and 32a is a pipe holding mechanism. Each of the movable clamps forming part of the mechanism is shown.

Figure 2 is a perspective view of the overall structure of the probe drive mechanism and pipe holding mechanism as seen from the front with a portion cut away, Figure 3 is a perspective view of the back as seen from the holding frame side, and Figure 4 is the holding frame. FIG. 3 is a plan view showing details of the pipe holding mechanism attached to the frame.

The probe drive mechanism and the pipe holding mechanism are integrally housed in a box-shaped holding frame 10 made of a plate with semicircular cutouts in the top and bottom surfaces.

The probe holder 11 of the probe drive mechanism is formed into a U-shaped notch in a part of a disc, and the probe 12 is attached to the upper surface of the probe holder 11 . The probe holder 11 is rotatably attached to a probe holder frame 14 via a plurality of rollers 15. The probe holder frame 14 is formed to have an L-shaped cross section that surrounds the probe holder 11, and the open side thereof is connected to the holding frame 10.
It is aligned with the opening side of the. Probe holder 11
Teeth 16 are carved on the outer peripheral edge of the rotary shaft 18, and these teeth 16 are meshed with a gear 19 spline-fitted to the rotating shaft 18. The rotating shaft 18 rotates via a chain 20 stretched between it and a drive motor (not shown). In addition, the probe holder frame 14 includes
It is provided with teeth (not shown) that mesh with the vertical gear 22, and is moved up and down by rotating the vertical gear 22 via a chain (not shown) stretched between the vertical gear 22 and a drive motor 24. Probe holder frame 14
Even if the probe holder 11 moves up and down, the rotation can be transmitted to the probe holder 11 because the gear 19 of the rotating shaft 18 is spline-fitted.

Thus, the probe 12 moves in the axial direction of the pipe 5 by the vertical movement of the probe holder frame 14, and moves in the circumferential direction of the pipe 5 by the rotation of the probe holder 11.

The main components of the pipe holding mechanism include a fixed clamp 30, a pair of movable clamps 32a and 32b, and an intermediate joint 26 that connects these clamps to the holding frame 10.

A tube support portion 56 is fixedly provided at the center of the front edge of the bottom plate of the holding frame 10, and a clamp receiving portion 36 is provided at each of the opposing leg ends on the opening side. The clamp receiving portion 36 is provided with an oblong hole 37 whose major axis extends in the front-rear direction. The center of this oblong hole 37 is located at a position perpendicularly symmetrical with respect to the longitudinal center line of the holding frame 10, and the center line connecting the centers of the left and right oblong holes 37 and the front end surface of the tubular support portion 56 are The distance between them shall be 1/4 of the outside diameter of the pipe to be held.

A boss portion 40 through which a clamp fixing bolt 39 is inserted is fixedly provided in the center of the top plate of the holding frame 10, and an intermediate joint 2 is attached to the threaded portion of the bolt 39.
Screw together 6. The middle joint hand 26 is moved in the backward direction (top plate side) or the forward direction (opening side) by rotating the bolt 39 forward and backward.

The fixed clamp 30 is formed into a semicircular shape, and the tube body support part 56 is fitted into a recess inside a boss part 31 fixed at the center of the top part of the boss part 31.
1 is connected to the intermediate joint hand 26 via a tension bolt 44 and a spring 45, and is inserted into the mounting holes drilled in both legs of the fixed clamp 30 and into the oblong hole 37 of the clamp receiving part 36. The held joint pin 46 is inserted and supported.

The movable clamps 32a and 32b are a pair of arc-shaped pieces whose inner peripheral surfaces have the same radius as the fixed clamp 30, and have a mounting hole provided at one end thereof.
Fitting the joint pin 46 held in the clamp receiving part 36 of the holding frame 10 so as to face each other,
Rotatably supported.

The movable clamps 32a and 32b have piping guides 48a and 48 each having a convex curved surface at the end on the joint pin side.
b is formed concentrically with the joint pin 46, and claw portions 50a and 50b are formed at the other end to overlap and engage when both rotate inward.

Piping guide 48a of one movable clamp 32a
A guide spring 49 is attached to the inner surface of. The claw portion 50a is formed integrally with the movable clamp 32a, but the claw portion 50b of the other movable clamp 32b
is configured to be rotatable outward about the pin 51 as a fulcrum. This claw portion 50b is a grip 5 provided on the outer surface of the top plate of the holding frame 10 with a wire rope 55 attached to the outer protrusion 52 of the claw portion 50b.
7 and can be rotated by operating the grip 57.

Furthermore, tube support portions 56a and 56b are provided on the inner peripheral surfaces of the movable clamps 32a and 32b, respectively. The tube support portions 56a, 56b are provided with the claw portions 50.
A position where the circumference formed by the movable clamps 32a, 32b and the fixed clamp 30 is divided into three equal parts from the position of the tube body support part 56 on the fixed clamp 30 side when the movable clamps 32a, 32b and the fixed clamp 30 are in the closed state when the clamps a and 50b are engaged with each other. It is arranged so that.

When the movable clamps 32a and 32b are fully opened with the claw side rotating outward (in the opening direction), they are held with a constant force by a spring plunger 38 provided in the clamp receiving part 36, and are held in the closing direction. The movable clamps 32a, 32b are designed to remain fully open unless a further external force is applied to them.

The piping attachment/detachment device of the automatic ultrasonic probe drive device configured as described above is operated in the following steps.

(1) When attaching to piping, attach the clamp fixing bolt 39 to the holding frame 10
Rotate counterclockwise from the top plate side of the middle joint 26
is moved forward, and the boss portion 31 of the fixed clamp 30 is pressed through the intermediate joint 26, and the fixed clamp 30 and the movable clamp 3 are moved in a state where the spring 45 is compressed.
2a and 32b are moved forward. Since the joint pin 46 that supports each clamp is inserted into the oblong hole 37 of the clamp receiving part 36, the length of the gap corresponding to the difference between the diameter of the joint pin 46 and the major axis of the oblong hole 37 is The clamp is pushed forward.

The movable clamps 32a and 32b are fixed by the spring plunger 38 of the clamp receiver 36 with the claw side fully open as shown by the dashed line in FIG.

When the entire device is inserted into the piping in this state, the guide spring 49 of one movable clamp 32a comes into contact with the piping 5, and the claw side receives an external force in the closing direction, so if this external force exceeds a certain level, the spring plunger The fixing force of 38 disappears, and the claw side begins to rotate in the closing direction using the joint pin 46 as a fulcrum. When further inserted into the pipe 5, the other movable clamp 3
The piping guide 48b of 2b comes into contact with the piping 5, the fixing force of the spring plunger 38 is similarly lost, and the claw side begins to rotate in the closing direction using the joint pin 46 as a fulcrum.

In this way, when the entire device is inserted into the piping, the movable clamp 3 equipped with the guide spring 49
2a contacts and rotates the piping 5 before the other movable clamp 32b, and the other movable clamp 32b
Therefore, the claw portion 50a of the movable clamp 32a provided with the guide spring 49 becomes inside the claw portion 50b of the other movable clamp 32b, and both claw portions 50a and 50b overlap each other. They mesh together when they fit together.

Claw portions 50a, 5 of movable clamps 32a, 32b
The reason why the movable clamps 32a and 32b engage with each other in the overlapping state as described above is because the movable clamps 32a and 32b are closer to the joint pin 46 than the center of the oblong hole 37 of the clamp receiving part 36.
This is because the movable clamps 32a, 3 are pressed in the forward direction by the gap between them.
The piping guides 48a, 48b of 2b are in contact with a position close to the center of the piping 5 that is in contact with the tube support 56 (the center of the piping 5 is a straight line connecting the center of the oblong hole 37 of the clamp receiving part 36). ), this is due to the pipe guide side expanding at a larger angle.

With the above operation, both movable clamps 32a, 32
After confirming that the claws 50a and 50b of b are engaged, the clamp fixing bolt 39 is rotated clockwise to move the intermediate joint 26 backward. As a result, the boss portion 31 of the fixed clamp 30 is retracted via the tension bolt 44 of the intermediate joint 26,
Fixed clamp 30 and movable clamps 32a, 32b
are pulled in the backward direction in the range of the gap between the oblong hole 37 of the clamp receiving part 36 and the joint pin 46, and the claw parts 50a and 50a of the movable clamps 32a and 32b are
A strong tensile force acts between 50b. Thus, the tube body support portion 56 on the fixed clamp 30 side and the tube body support portions 56a, 56b of the movable clamps 32a, 32b.
A strong tightening force is applied to press the pipe 5, and the entire device is held on the pipe 5.

(2) When removing from the pipe, attach the clamp fixing bolt 39 to the holding frame 10
Rotate counterclockwise from the top plate side of the middle joint 2.
6 forward, and the boss portion 3 of the fixed clamp 30
Fixed clamp 30 and movable clamp 32 through 1
a, 32b are moved forward and pressed in the forward direction by a gap between the oblong hole 37 of the clamp receiving part 36 and the joint pin 46. This allows the movable clamp 3
Expanding force acts on the piping guide side of 2a, 32b, and the tensile force between the claws 50a, 50b is released.
Next, the grip 57 of the holding frame 10 is operated to pull the wire rope 55, and the movable clamp 3
The claw part 50b of the other movable clamp 32a is rotated outward about the pin 51 to rotate the claw part 50b of the other movable clamp 32a.
Disengage from a. Then, the entire device holding the pipe 5 is pulled out. As the piping 5 is pulled away from the entire device, the movable clamps 32a, 32
b, the claw side gradually moves in the opening direction using the joint pin 46 as a fulcrum, and when the distance between the tips of both claw parts 50a and 50b becomes the same dimension as the outer diameter of the pipe 5, the spring plunger 38 closes the clamp receiving part. It is fixed at 36 and becomes fully open.

When the automatic ultrasonic probe drive device equipped with the probe drive mechanism and pipe holding mechanism of this invention is attached to the pipe as described above, the probe holder of the probe drive mechanism moves in the circumferential direction of the pipe. By rotating the probe holder approximately 90 degrees back and forth in the circumferential direction of the pipe, the entire circumference of the pipe can be scanned by the probe.
Furthermore, by moving the probe holder in the axial direction of the pipe, the probe can scan the axial direction of the pipe.

As is clear from the above explanation, according to this invention, the operation of attaching and detaching the automatic ultrasonic probe drive device to and from the piping is extremely simple, which improves work efficiency during attachment and detachment, and improves inspection efficiency. This allows a significant reduction in time. Therefore, when the device of this invention is used for inspections of nuclear power plants during their service life, it can be expected to be highly effective in reducing the risk of radiation exposure for inspectors.

Further, according to the device of this invention, since it is possible to attach and detach from the piping from all directions, even the piping installed in a complicated state can be easily attached and detached.

This invention can be applied not only to the above-mentioned automatic ultrasonic flaw detection device for pipe welds, but also to pipe attachment/detachment devices such as automatic pipe welders and automatic weld surface observation machines.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the automatic ultrasonic probe drive device of this invention attached to a pipe, and Fig. 2 is a partially cutaway view of the probe drive mechanism and pipe holding mechanism of this invention. FIG. 3 is a rear perspective view of FIG. 2, and FIG. 4 is a plan view showing the pipe holding mechanism. 10... Holding frame, 11... Probe holder, 12... Probe, 14... Probe holder frame, 15... Roller, 26... Middle joint hand, 3
0...Fixed clamp, 31...Boss portion of fixed clamp, 32a, 32b...Movable clamp, 36...
... Clamp receiving part, 37 ... Oval hole, 39 ... Fixing bolt, 40 ... Fixed clamp mounting boss part, 46 ... Joint pin, 48a, 48b ... Piping guide, 49 ... Guide spring, 50a ,50b...
...Claw part, 51...Pin, 52...Protrusion for attaching open wire, 56, 56a, 56b...Tube body support part.

Claims (1)

[Claims for Utility Model Registration] (1) A probe having a U-shaped notch in a part of a disc that is equipped with a mechanism that moves in the circumferential direction of a cylindrical measuring part and has an ultrasonic probe holding part. a probe holder frame having an L-shaped cross section and having a mechanism for moving in the axial direction of a cylindrical measuring section and surrounding the probe holder via a plurality of rollers; and a top surface and a bottom surface. and a holding frame having an opening surface on the side with the semicircular notch, and the probe is placed in the holding frame. In the automatic ultrasonic probe driving device, the probe holder and the probe holder frame are accommodated with the U-shaped leg direction of the holder and the opening direction of the holding frame being aligned. A boss part with a fixing bolt inserted through it is fixed in the center of the top plate located on the opposite side of the opening surface of the frame, and the tube holding part arranged on the bottom plate of the holding frame is attached to a semicircular fixing clamp. It is fitted into a recess in a boss fixed to the center of the top, and is further fitted and held in an oblong hole bored in a clamp receiver provided at the ends of the opposite legs on the opening side of the holding frame. Fit the joint pins into the mounting holes drilled in both legs of the fixed clamp, and attach the holding frame to the holding frame using the fixing bolts inserted into the boss parts of the holding frame via the intermediate joints. In addition to connecting the fixed clamps so that they can move forward and backward,
A movable clamp consisting of a pair of arc-shaped pieces having an inner circumferential surface having the same radius as the inner circumferential surface of the fixed clamp is supported by a clamp receiving portion of the holding frame through a mounting hole provided at one end of the movable clamp. A claw portion is provided at each end of the movable clamp opposite to the joint pin connecting end so that the movable clamp is inserted into the joint pin and faces each other, and the movable clamps engage and connect with each other. Features a piping attachment/detachment device for automatic ultrasonic probe drive equipment. (2) Utility Model Registration Scope of Claims In the piping attachment/detachment device described in claim 1, each movable clamp has a piping guide concentrically with the joint pin at the end on the joint pin side, and one movable clamp has a guide spring. A piping attachment/detachment device for an automatic ultrasonic probe drive device, characterized in that the other movable clamp has a claw portion that is configured such that only the claw portion can rotate.