JPH0126499B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for tracing the outer peripheral surface of a pipe,
This is a tracing device that can trace the outer peripheral surface of a cylindrical or cylindrical object without being affected by its outer diameter.

Conventionally, when tracing the outer circumferential surface of an object having a circular outer circumferential surface (hereinafter referred to as a pipe), such as a pipe, a guide roll 8 is pressed against the outer circumferential surface of the pipe P, as shown in FIG. A mechanism is in place to maintain a constant distance from the Then, the jig is moved along the pipe axis while scanning a certain range of the pipe's outer circumferential surface with the center line connecting the two guide rolls correctly aligned with the pipe axis. When the inspection device 15 moves in a zigzag manner with respect to the axial direction of the pipe, flaws occur on the pipe surface because the rotation direction of the guide roll 8 is limited to only one direction. Therefore, in order to cause the device 15 to travel in a zigzag manner over a certain range for scanning, a special structure of the guide roll 8 is required, which has the disadvantage of being complicated.

The present invention eliminates the above-mentioned drawbacks and makes it possible to move the inspection equipment in a zigzag pattern while correctly moving the guide roll along the pipe axis in a so-called bottom reference type device, and also to maintain a constant distance between the pipe surface and the equipment. The purpose of the present invention is to provide a tracing device that makes it possible to maintain the following conditions.

In order to achieve the above object, the configuration of the present invention is as follows.

a first lifting platform that is movable up and down with reference to the position of the lower surface of the horizontal pipe above the outer peripheral surface of a horizontal pipe whose lower surface is kept at a constant height; and a first lifting means for the first lifting platform; a second elevating member mounted on the first elevating table so as to be movable up and down; a second elevating means for the second elevating member; and a second elevating member attached to the lower surface of the second elevating member, and attached to the outer peripheral surface of the pipe. a guide roll that rolls in contact with the first lifting platform; an arcuate guide rail that is attached to the lower part of the first lifting platform so as to straddle the pipe with a distance therebetween, and has a radius of curvature larger than the radius of the pipe; a slide stand mounted on a guide rail and capable of reciprocating on an arc concentric with the pipe; a reciprocating drive means for the slide stand; a pipe inspection equipment mounting jig attached to the slide stand; In response to a change in the outer diameter of the pipe, the first lifting platform is configured to move relative to the pipe, and
an interlocking means connected to the first and second elevating means such that the second elevating member moves up and down relative to the first elevating table by the same amount at the same time, and the first elevating table The arcuate guide rail is raised and lowered so that the center thereof coincides with the center of the pipe, and the second lifting member is raised and lowered so that the guide roll comes into contact with the outer peripheral surface of the pipe.

An embodiment of the present invention will be described below based on the drawings. In FIGS. 1 and 2, a pipe P to be paralleled is placed on a pipe holder A in a horizontal state. A support stand 1 installed above the pipe P
An elevating platform that can move up and down is installed. That is, the elevating table includes a first elevating table 3 that can be raised and lowered by a first elevating means 4 having a threaded rod 4a, a worm wheel and a worm (not shown) that are screwed together and rotated, and the first elevating table 3. It consists of a second elevating member 5 that can be raised and lowered with respect to the platform 3 by a second elevating means 6, and a third elevating table 10 that can be finely adjusted up and down.

The first lifting platform 3 includes an upper lifting platform 31 and a lower lifting platform 3.
2 are assembled via an air cylinder 33 serving as an elevating/lowering connection means, and a sliding surface 3a formed on the outer surface of the upper elevating table 31 is inscribed in the support table 1 so as to be able to freely slide.

The second elevating member 5 has a key 5 attached to the lower part 32 of the first elevating table.
A is prevented from rotating and is held vertically slidably through the shaft, and a guide roll 7 is provided at the lower end thereof.
The guide roll 7 is capable of rolling in the axial direction of the pipe while contacting the outer peripheral surface of the pipe as the pipe moves in the axial direction, and is moved up and down together with the second elevating member 5 by the second elevating means 6. It is considered possible to move.

As the second elevating means 6, a threaded rod 6a is integrally formed coaxially with the upper end of the second elevating member 5, and a wheel 6b with a nut is screwed onto the threaded rod and rotates at a fixed position.
The worm 6c meshes with the worm 6c. All of these are the first
It is housed in a box body 34 fixed to the upper end of the lower part 32 of the lifting platform. The air cylinder 33 is connected to the upper wall of the box body 34.

Arc guide rails 8 having a radius of curvature larger than the radius of the pipe P are fixed to both sides of the lower part 32 of the first lifting platform in the pipe movement direction. A third elevating table 10 is mounted on the guide rail 8 via a slide table 9. That is, the slide table 9 is attached so as to sandwich the guide rail 9 from above and below via the ball. This slide table 9 has a third lifting table 10 that can be finely adjusted up and down.
is mounted. At the bottom of this third lifting platform 10,
An equipment mounting jig 11 is fixed at a distance from the outer peripheral surface of the pipe, and various equipment 1 for bead inspection such as ultrasonic flaw detection, eddy current flaw detection, and optical flaw detection is attached to the lower end of the jig 11.
4 is attached at a constant distance from the pipe P.

The slide table 9 is provided with a slide table driving means 1 consisting of a crank mechanism 12a and a connecting rod 12b for forcibly sliding it on the arcuate guide rail 8 by a motor (not shown) or the like.
2 are pin-coupled. By changing the pin connection position of the connecting rod 12b to the crank mechanism 12a, the scanning width on the outer circumferential surface of the pipe P can be arbitrarily changed.
Further, by adjusting the length of the connecting rod 12b with a screw, the scanning center position can be adjusted.

Here, in response to a change in the outer diameter of the pipe P, etc., the first lifting platform 3 is moved relative to the pipe P, and the second
An interlocking means 13 is connected to the first and second elevating means 4 and 6 so that the elevating member 5 moves up and down relative to the first elevating table 3 by the same amount at the same time. That is,
The interlocking means 13 is a worm 6c of the second elevating means.
the first sprocket 132 mounted coaxially with
a, an interlocking element consisting of a second sprocket 132b for intermediate guidance, a third sprocket 132c coaxially fixed to the drive worm of the first elevating means 4, and a first chain 133a and a second chain 133b that connect and drive these sprockets. and a handle 131 for driving these interlocking elements. For example, by making the pitch of the threaded rod 4a the same as the pitch of the threaded rod 6a, the first lifting platform 3 and the second lifting member 5 can be raised and lowered by the same amount at the same time by rotating the handle 131. Ru.

The operating state will be explained above. The first lifting platform 3 is raised and lowered so that the center O ₂ of the arcuate guide rail 8 coincides with the center O ₁ of the pipe P, and the second lifting member 5 is raised and lowered so that the guide roll 7 contacts the outer peripheral surface of the pipe P. be done. That is, when the outer diameter of the pipe P is Dmm and the arc radius of the arcuate guide rail 8 is Rmm, the distance T between the outer peripheral surface of the pipe and the guide rail 8 is set to T=R-D/2 in advance by the first elevating means 4. By setting, the center of the guide rail and the center of the pipe match. At this time, the guide roll 7 is set so as to be in contact with the upper surface of the pipe P. In this state, tracing work is performed.

Next, if the outside diameter of the pipe follows that of D′,
By turning the handle 131 to adjust the elevation until the guide roller 7 comes into contact with the upper surface of the pipe P, the center _O2 of the arcuate guide rail 8 is moved up and down so as to coincide with the pipe center _O1 . This allows the various inspection devices to line up the outer peripheral surface of the pipe P at constant intervals. This interval is also finely adjusted by a screw mechanism (not shown) built into the slide table 9 of the third lifting table 10.

The lifting interlocking means 33 serves to temporarily lift the third lifting platform 10 to which the equipment mounting jig 11 is fixed, in order to facilitate the transfer of equipment at the end of the pipe when changing the size of the pipe P. . It also serves to raise and secure the testing equipment 14 when it is used.

FIG. 3 shows another embodiment of the guide roll of the present invention, and as shown in the figure, it rolls the upper half of the outer circumferential surface of the pipe to be rolled at two locations sandwiching a vertical plane containing the pipe axis. Guide roll 16 to move
is held with its axis perpendicular to the axis of the pipe and inclined with respect to the horizontal.
As a result, the slide table 9 is set so as not to oscillate laterally (vibrate in the pipe arc direction) when being driven, and to prevent the arc axis of the guide rail 8 from deviating from the pipe axis.

The present invention has the above structure, and the inspection equipment includes:
Since it travels in a zigzag pattern while maintaining a certain distance without directly touching the outer circumferential surface of the pipe, it can reliably trace a wide range of the outer circumferential surface of the pipe, and is widely used in ultrasonic flaw detection and other inspections on weld beads in welded pipes. The scanning speed can be increased from several cycles/minute to several hundred cycles/minute. In addition, it has become extremely useful as it has become easy to automate equipment, greatly contributing to improving performance and saving labor. Moreover,
Even if the outer diameter of the pipe changes, the previous formula T=R-D/2
The center of the guide rail and the center of the pipe can be automatically aligned by simply adjusting the guide roll each time so that it is in contact with the top surface of the pipe, saving labor and enabling quick work.

[Brief explanation of drawings]

Figure 1 is a front view showing one embodiment of the present invention, Figure 2 is a front view showing one embodiment of the present invention;
The figure is a side view, FIG. 3 is a front view showing another embodiment of the guide roll, and FIG. 4 is a side view of a conventional device. P is a pipe, A is a pipe pedestal, 1 is a support stand,
2 is a guide post, 3 is a first lifting platform, 4 is a first lifting means, 5 is a second lifting member, 6 is a second lifting means,
7 is a guide roll, 8 is an arc guide rail, 9 is a slide table, 10 is a third lifting table, 11 is a device mounting jig, 12 is a slide table driving means, 12a is a crank mechanism, 12b is a connecting rod, and 13 is an interlocking means ,
131 is the handle, 132 is the sprocket, 13
3 is Chien.

Claims (1)

[Claims] 1. A first lifting platform provided above the outer peripheral surface of a horizontal pipe whose lower surface is kept at a constant height so as to be movable up and down with reference to the position of the lower surface of the pipe, and a first lifting means for the first lifting platform. , a second elevating member mounted on the first elevating table so as to be movable up and down; a second elevating means for the second elevating member; a second elevating member attached to the lower surface of the second elevating member; a guide roll that rolls in contact with the first lifting platform; an arcuate guide rail that is attached to the lower part of the first lifting platform so as to straddle the pipe with a distance therebetween, and has a radius of curvature larger than the radius of the pipe; a slide stand mounted on a guide rail and capable of reciprocating on an arc concentric with the pipe; a reciprocating drive means for the slide stand; a pipe inspection equipment mounting jig attached to the slide stand; In response to a change in the outer diameter of the pipe, the first lifting platform is configured to move relative to the pipe, and
an interlocking means connected to the first and second elevating means such that the second elevating member moves up and down relative to the first elevating table by the same amount at the same time, and the first elevating table A pipe characterized in that the arcuate guide roll is raised and lowered so that the center thereof coincides with the center of the pipe, and the second lifting member is raised and lowered so that the guide roll comes into contact with the outer peripheral surface of the pipe. A device for tracing the outer circumferential surface of