KR101095929B1 - Device for correcting round of large caliber steel pipe - Google Patents

Abstract

The present invention relates to a round straightening device for restoring a crushed portion generated in a large pipe such as a thick pipe to its original curvature, the lower support comprising a circular arc surface having the same curvature as the inner circumferential surface of the large steel pipe; A hydraulic jack installed vertically on an upper portion of the lower support; An upper jig block mounted on a piston tip of the hydraulic jack, the upper surface of which is configured to have an arc surface of the same curvature as the inner circumferential surface of the large steel pipe, so as to push up the crushed portion of the large steel pipe from the inside by the hydraulic jack; And a plurality of ball casters mounted on the lower support, each of which is elastically biased downward to elastically contact the inner circumferential surface of the large steel pipe. As a result, the present invention can easily restore each crushed portion to its original state by only one input to the inside of the large steel pipe, regardless of the location or position of the crushed portion.

Description

Device for correcting round of large caliber steel pipe}

The present invention relates to a large-sized pipe round straightening device, and more particularly, to easily restore a crushed portion formed on the main surface of a large pipe such as a thick pipe manufactured by bending a steel plate in a circular shape by rolling or the like. A large pipe round straightening device for use.

In general, large steel pipes used for offshore structures, oil pipes, and LNG (liquefied natural gas) transport pipes have a diameter of several hundred mm or more, and thick pipes having excellent structural safety are used because of their characteristics.

Since the thick pipe is a large pipe with a fairly large diameter and is much thicker than a normal pipe, a steel plate is usually cylindrically formed by continuous bending using several rolling devices, and then welded to each other by butt joint welding. To make.

Accordingly, after the production of thick pipes (hereinafter referred to as "large steel pipes") is completed, it is common to inspect various defects, including welds, to ensure structural safety. One of these inspection items is the presence of partial dents, which are likely to occur during the manufacturing or handling of large steel pipes. In this case, the crushed parts are restored to their original curvature state by using a so-called “round correction device”. .

FIG. 1 schematically shows a conventional round straightening device for restoring a crushed portion of a large steel pipe.

The upper surface has the same curvature as the inner circumferential surface of the large steel pipe P at the tip of the piston 3 of the hydraulic jack 2 provided on the lower support 1 having the same curvature as the inner circumferential surface of the large steel pipe P. By mounting the jig block (4), the operator takes the device directly into the inside of the large steel pipe (P), sets the upper jig block (4) to be located in the crushed portion (C), and then operates the hydraulic jack (2) The upper jig block 4 is to be restored by pushing up the crushed portion (C).

However, since the conventional round straightening device has to take the heavy device directly to the inside of the large steel pipe (P) and place it in the crushed portion (C), the straightening work is very difficult, and there is a high risk of safety accidents. .

In particular, when there are two or more dents (C) in the large steel pipe (P) and at an angle to each other, it is necessary to restore the first place and then remove the device and put it back into the large steel pipe (P) again. There is a troublesome problem.

In other words, in order to restore the crushed portion (C), the correction device must be put in place while the large steel pipe (P) is positioned so that the crushed portion (C) is placed on the upper portion, and thus there are two or more places to restore. If the angles to each other, after the restoration of one place to place the large steel pipe (P) so that the other place again on the top, you have no choice but to take out the calibration device again.

The present invention has been proposed in order to solve the above-mentioned conventional problems, and a large-sized round pipe correction can be easily restored to the original state of each crushed portion by one input into a large steel pipe irrespective of the location or position of the crushed portion. The object is to provide a device.

It is another object of the present invention to provide a large pipe round straightening device which allows the operator to simply place the device inside the large steel pipe and accurately position it in the dents without directly entering the large steel pipe.

In order to solve the above problems, the present invention, in the round straightening device for restoring the crushed portion generated in the large pipes, such as thick pipe to the original state of curvature, the lower surface is an arc surface of the same curvature as the inner peripheral surface of the large steel pipe Lower support consisting of; A hydraulic jack installed vertically on an upper portion of the lower support; An upper jig block mounted on a piston tip of the hydraulic jack, the upper surface of which is configured to have an arc surface of the same curvature as the inner circumferential surface of the large steel pipe, so as to push up the crushed portion of the large steel pipe from the inside by the hydraulic jack; And a plurality of ball casters mounted on the lower support, each of which is elastically biased downward to elastically contact the inner circumferential surface of the large steel pipe.

In the above, the ball casters are provided at least two on the front and rear of the lower support, the ball casters provided on the front and rear of the lower support are preferably arranged radially with respect to the center of the large steel pipe, respectively. Do.

The holding sleeve is fixed to the lower support to elastically bias the ball caster downward, a spring is provided in the holding sleeve, and the ball caster is provided to be slidable along the holding sleeve. It is preferable to be elastically supported by the spring.

In the above, it is preferable that the lower supporter is further provided with a pusher for advancing into and out of the large steel pipe.

According to the present invention, the lower support is provided with a plurality of ball casters to elastically contact the inner circumferential surface of the large steel pipes, so that each of the single input to the inside of the large steel pipes, regardless of the location or location of the dents The crushed area can be easily restored to its original state.

In addition, since the lower supporter is provided with a pusher, the calibration device can be easily inserted into the large steel pipe from the outside of the pipe and positioned accurately in the crushed portion, without the operator directly entering the large steel pipe. Of course, withdrawal from the pipe is also very easy.

Hereinafter, the specific configuration and operation will be described based on the embodiment according to the present invention.

Figure 2 is a perspective view showing a large pipe round straightening device according to the present invention, Figure 3 is a front view showing a state in which the round straightening device of the present invention is inserted into a large steel pipe for calibration, Figure 4 is a side view of FIG. 5 is a cross-sectional view showing a mounting structure of the ball caster of the present round straightening device, and FIGS. 6A to 6F are views sequentially showing a method of restoring a crushed portion of a large steel pipe using the present round straightening device.

Large pipe round straightening device according to the present invention, the lower support 10 in contact with the inner peripheral lower portion of the large steel pipe (P) to be corrected, the hydraulic jack 20 for pushing up the upper jig block 30 to be described later, and the large The upper jig block 30 is pushed upward by the hydraulic jack 20 in contact with the inner portion of the crushed portion (C) of the steel pipe (P) and a plurality of ball casters 40 for smooth movement of the calibration device.

The lower surface 11 of the lower support 10 has a circular arc surface with the same curvature as the inner circumferential surface of the large steel pipe P so that the large steel pipe P to be calibrated during operation of the hydraulic jack 20 is not deformed by local large force. It consists of. The lower support 10 is preferably configured to be somewhat larger than the upper jig block 30 for stable support during the calibration operation.

The lower support 10 may be provided with a lower mounting member 12 for mounting the hydraulic jack 20 on the upper surface, the lower mounting member 12 is a correction device for the diameter of the large steel pipe (P) Also serves as a compensation for the height of the.

Hydraulic jack 20 is installed vertically on the mounting member 12 integrally provided on the upper portion of the lower support (10). The piston 21 of the hydraulic jack 20 is located on the upper side, and the upper mount member 22 for mounting the upper jig block 30 is integrally fixed to the free end of the piston 21.

The upper jig block 30 is fixed to the upper surface of the upper mount member 22 mounted at the tip of the piston 21 of the hydraulic jack 20. The upper surface 31 of the upper jig block 30 is composed of an arc surface of the same curvature as the inner circumferential surface of the large steel pipe (P) to restore the crushed portion (C) of the large steel pipe (P) to be restored to its original state. .

For example, two ball casters 40 are mounted on the front and rear surfaces of the lower support 10. These ball casters 40 may be simply installed vertically, but preferably, two ball casters 40 are provided at the front and the rear for smoother movement and stable support in the large steel pipe P. It is disposed radially with a certain angle (θ) with respect to the center of the large steel pipe (P) (see Fig. 3).

Each ball caster 40 is elastically biased downward by the spring 41 to elastically contact the inner circumferential surface of the large steel pipe P, which is caused by the ball caster 40 being actuated by the spring 41 when the hydraulic jack 20 is operated. In order to prevent the deformation of the large steel pipe (P) due to the local pressure by moving upward while compressing.

The spring 41 elastically supports the ball caster 40 so that the lower surface of the lower support 10 can be spaced apart from the inner circumferential surface of the pipe P despite the load of the device.

To this end, each ball caster 40 is elastically biased by a spring 41 interposed therebetween, for example, axially movable in a holding sleeve 42, as shown in FIG. It is fixed to the lower support 10 via an arm 43 provided on the outer circumference of the holding sleeve 42.

On the other hand, the large pipe round straightening device of the present invention is further provided with a push rod 50 of a predetermined length for injecting and withdrawing the straightening device into the inside of the large steel pipe (P) on at least one of the front and rear surfaces of the lower support (10). can do.

Such a pusher 50 may be fixed to the lower support 10, but it is preferable that the lower support 10 is provided with a detachable boss (51) on the lower support 10 so that it can be mounted only when necessary. .

A method of restoring the crushed portion C of the large steel pipe P using the round straightening device according to the present invention configured as described above will be described in parallel with FIGS. 6A to 6F.

First, as shown in FIG. 6a, a large steel pipe P for calibration is placed on a pair of supporting rollers R that are properly spaced horizontally, and then the large steel pipe P is rotated to vertically distort the crushed portion C. Position it at the top.

In this state, as shown by the virtual line in Fig. 6b, the round straightening device of the present invention is put into one of the inside of the large steel pipe P placed on the support roller R, and the crushed portion using the pusher 50 is used. Push it up to (C). Then, the round straightening device is very easily moved to the corresponding position by the ball casters 40 provided in the lower support 10.

At this time, the lower support 10 and the upper jig block 30 is properly spaced apart from the inner circumferential surface of the large steel pipe (P). At this time, the device is in contact with the large steel pipe (P) only by the ball caster (40).

As such, after the round straightening device is placed inside the crushed portion C of the large steel pipe P, the hydraulic jack 20 is driven. Then, as shown in FIG. 6C, the piston 21 of the hydraulic jack 20 is raised, and the upper surface 31 of the upper jig block 30 first contacts the crushed portion C, and then the ball casters 40 are hydraulic jack 20. The lower surface 11 of the lower support 10 is brought into close contact with the inner circumferential surface of the large steel pipe P by compressing the spring 41 while the spring 41 is compressed along the elongation.

After the lower support 10 is in contact with the inner circumferential surface of the large steel pipe (P), as shown in Figure 6d, the piston 21 of the hydraulic jack 20 is further raised to push up the crushed portion (C), the upper jig block ( The upper surface 31 of 30 has an arc shape with the same curvature as the inner circumferential surface of the large steel pipe P, so that the crushed portion C is correctly restored to its original state.

When the restoration of the crushed portion C is completed, the piston 21 is contracted as shown in FIG. 6E, and thus the ball caster 40 returns to the initial state by restoring elasticity of the spring 41, thereby supporting the lower support 10. And the upper jig block 30 are spaced apart from the inner circumferential surface of the large steel pipe P.

After the contraction of the piston 21 is completed, the round straightening device is drawn out to the outside of the large steel pipe (P) by using the rod 50 as in the case of closing, and completes the work.

In the case where there are dents in the inside of the large steel pipe (P) at various points, especially when the angle is different, the large steel pipe (P) can be rotated as shown in FIG. The caster 40 can maintain the vertical posture as it is.

That is, when the crushed portion (C) in the large steel pipe (P) is present at two or more locations and at an angle to each other, first, after correcting any one place by the above-described method, the round straightening device is a large steel pipe (P). ) While leaving the inside inside, as shown in FIG. 6f, the large steel pipe P is rotated to place another crushed portion C in the vertical upper portion.

At this time, the round straightening device of the present invention is provided with a ball caster 40 on the lower support 10, it does not fall even during the rotation of the large steel pipe (P) to maintain a stable state.

Once the other crushed portion (C) is located at the top, by using the pusher 50 to move to the crushed portion (C) to restore the round correction device, it is possible to simply restore the portion by the above-described method.

The above embodiments are only preferred embodiments of the present invention, and the technical idea of the present invention may be variously modified or adjusted by those skilled in the art. Such modifications and adjustments fall within the scope of the present invention if they use the technical idea of the present invention.

The present invention can be used to straighten rounds of large steel pipes.

1 is a front view showing a conventional large pipe round straightening device,

Figure 2 is a perspective view of a large pipe round straightening apparatus according to the present invention,

3 is a front view showing a state in which the round straightening device of the present invention is inserted into a large steel pipe and calibrated,

4 is a side view of FIG. 3;

5 is a cross-sectional view showing the mounting structure of the ball caster of the present round calibration apparatus;

6a to 6f are views sequentially showing a method of restoring a dent in a large steel pipe using the present invention round calibration device.

<Description of Symbols for Main Parts of Drawings>

10: Lower support 11: Lower support

20: Hydraulic Jack 21: (Hydraulic Jack) Piston

30: upper jig block 31: (upper jig block) upper surface

40: ball caster 41: spring

50: push rod P: large steel pipe

C: Crushed Area R: Support Roller

Claims (4)

As a round correction device for restoring the dents generated in large pipes such as thick pipes to their original curvature, A lower support having a lower surface having an arc surface with the same curvature as the inner circumferential surface of the large steel pipe; A hydraulic jack installed vertically on an upper portion of the lower support; An upper jig block mounted on a piston tip of the hydraulic jack, the upper surface of which is configured to have an arc surface of the same curvature as the inner circumferential surface of the large steel pipe, so as to push up the crushed portion of the large steel pipe from the inside by the hydraulic jack; And a plurality of ball casters mounted on the lower support, each of which is elastically biased downward to elastically contact an inner circumferential surface of the large steel pipe. A holding sleeve is fixed to the lower support to elastically bias the ball caster downward, a spring is provided in the holding sleeve, and the ball caster is provided to be slidable along the holding sleeve and is elastically supported by the spring. Large pipe round straightening device characterized in that the. The method of claim 1, At least two ball casters are provided on the front and rear surfaces of the lower supporter, and the ball casters provided on the front and rear surfaces of the lower supporter are respectively disposed radially with respect to the center of the large steel pipe. Round calibrator. delete The method according to claim 1 or 2, Large round pipe straightening device characterized in that the lower support is further provided with a push rod for entering and exiting into the large steel pipe.

Images