Curved pipe rotating device

Abstract

To provide a curved pipe rotation device which is excellent in adaptability to a plurality of pipes having different thicknesses.SOLUTION: A curved pipe rotation device 1 has: a first support surface 2a which forms a three-dimensional convex curved surface and is brought into contact with a curved part 7a of a pipe 7 outside the curving and on one side to a central longitudinal section of the pipe 7; a second support surface 3a which forms a three-dimensional convex curved surface and is brought into contact with the curved part 7a outside the curving and on the other side to the central longitudinal section; a third support surface 4a which forms a three-dimensional convex curved surface and is brought into contact with the curved part 7a outside the curving, on the one side to the central longitudinal section, and on one side in a length direction of the pipe 7 to the first support surface 2a and the second support surface 3a; and a fourth support surface 5a which forms a three-dimensional convex curved surface and is brought into contact with the curved part 7a outside the curving, on the other side to the central longitudinal surface, and on the one side in the length direction of the pipe 7 to the first support surface 2a and the second support surface 3a.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a curved pipe rotating device.

Background Art

[0002] There is known a curved pipe rotating device having a rotating shaft that fixes a curved portion of a pipe such as an elbow pipe and rotates the pipe (see, for example, Patent Document 1). According to the curved pipe rotating device, by rotating one end side portion of the pipe on the rotation axis line of the rotating shaft, processing such as welding or cutting over the entire circumference with respect to the one end side portion can be easily performed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] It is desirable that the curved pipe rotating device has excellent compatibility with a plurality of pipes having different thicknesses.

[0005] Therefore, an object of the present invention is to provide a curved pipe rotating device having excellent compatibility with a plurality of pipes having different thicknesses.

Means for Solving the Problems

[0006] One aspect of the present invention is as follows.

[0007] [1] It has a three-dimensional convex curved surface shape that protrudes in a direction perpendicular to a planar reference surface, and a first support surface that abuts against the outer side of the curvature with respect to the curved portion of the pipe and on one side with respect to the central longitudinal section of the pipe, A third-dimensional convex curved surface projecting in a direction perpendicular to the reference plane, and a second support surface that abuts the curved portion of the pipe on the outside of the curve and on the other side of the central longitudinal section of the pipe, It has a three-dimensional convex curved surface that protrudes in a direction perpendicular to the reference plane, and with respect to the curved portion of the pipe, on the outside of the curve and the central longitudinal section of the pipe The aforementioned One side, and with respect to the first support surface and the second support surface. before A third support surface that contacts the tube on one side in the longitudinal direction, A third-dimensional convex curved surface projecting in a direction perpendicular to the reference surface, a fourth support surface that abuts the curved portion of the pipe on the outside of the curve, on the other side of the central longitudinal section of the pipe, and on one side of the pipe in the longitudinal direction relative to the first support surface and the second support surface, A curved pipe rotating device having a first support surface, a second support surface, a third support surface, and a fourth support surface to fix the curved portion of the pipe, and a rotating shaft for rotating the pipe about a rotation axis inclined with respect to a reference surface.

[0008] [2] A holding portion that integrally holds the first support surface, the second support surface, the third support surface and the fourth support surface, The holding portion is positioned relative to the rotation axis, within the central longitudinal section of the pipe. rotate The curved pipe rotating device according to [1], further comprising an adjustment mechanism that allows for positional adjustment in a direction not parallel to the axis.

[0009] [3] It has a holding portion that integrally holds the first support surface, the second support surface, the third support surface, and the fourth support surface, The holding part has a pair of restraint member fixing parts through which both ends of a U-bolt, which serves as a restraint member for restraining the curved portion of the pipe to the holding part, Each of the aforementioned restraint member fixing parts comprises multiple parts of different thicknesses. The aforementioned A curved pipe rotating device according to [1] or [2], comprising multiple holes or elongated holes to accommodate U-bolts of multiple dimensions corresponding to the pipe.

[0010] [4] A method for rotating a curved tube, comprising: sequentially fixing the curved portions of a plurality of tubes having different thicknesses to the rotating shaft of the curved tube rotating device according to any one of [1] to [3]; and rotating one end portion of the tube on the rotation axis line.

Advantages of the Invention

[0011] According to the present invention, it is possible to provide a curved tube rotating device having excellent compatibility with a plurality of tubes having different thicknesses.

Brief Description of the Drawings

[0012] [Figure 1] FIG. 1 is an external view showing a state in which three curved tube rotating devices according to the first embodiment of the present invention are arranged side by side and tubes having different thicknesses are fixed. [Figure 2] FIG. 1 is an external view showing the state shown in FIG. 1 from the parallel direction of three curved tube rotating devices. [Figure 3] FIG. 1 is an external view of the holding portion shown in FIG. 1. [Figure 4] (a) is a conceptual diagram showing a state without core deviation when one end portion of a tube is rotated on the rotation axis line of the rotation axis using the curved tube rotating device shown in FIG. 1, as viewed in the direction along the rotation axis line, and (b) is a conceptual diagram showing a state with core deviation in contrast to (a). [Figure 5] FIG. 5 is an external view showing a state in which two curved tube rotating devices according to the second embodiment of the present invention are arranged side by side and tubes having different thicknesses are fixed. [Figure 6] FIG. 5 is an external view showing the state shown in FIG. 5 from the parallel direction of two curved tube rotating devices. [Figure 7] FIG. 5 is an external view of the holding portion shown in FIG. 5. [Figure 8] FIG. 8 is an external view showing a state in which a tube is fixed to the curved tube rotating device according to the third embodiment of the present invention. [Figure 9] FIG. 8 is an external view showing the state shown in FIG. 8 from another direction. [Figure 10] FIG. 9 is an external view showing a state in which five curved tube rotating devices according to the fourth embodiment of the present invention are arranged side by side and tubes having different thicknesses are fixed, as viewed from the parallel direction of the five curved tube rotating devices. [Figure 11] This is an external view showing a state when, starting from the state shown in FIG. 10, the fixed tube is replaced with a shorter tube and centering is performed by an adjustment mechanism.

Embodiment for Carrying Out the Invention

[0013] Hereinafter, embodiments of the present invention will be illustrated and described with reference to the drawings.

[0014] As shown in FIGS. 1 to 3, in the first embodiment of the present invention, the curved tube rotating device 1 has a first support surface 2a, a second support surface 3a, a third support surface 4a, a fourth support surface 5a, and a rotating shaft 6. Note that FIG. 1 shows a state in which three identical curved tube rotating devices 1 are arranged side by side and tubes 7 having different thicknesses are fixed, and FIG. 2 shows the state shown in FIG. 1 from the parallel direction of the three curved tube rotating devices 1.

[0015] The first support surface 2a has a three-dimensional convex curved surface shape that protrudes in a direction perpendicular to the planar reference surface P, and abuts against the curved portion 7a of the tube 7 on the outer side of the curvature and on one side with respect to the central longitudinal section of the tube 7.

[0016] The three-dimensional convex curved surface shape means that it forms a convex curved surface shape in both the first cross section perpendicular to the reference surface P and the second cross section perpendicular to both the reference surface P and the first cross section. The first support surface 2a forms a rotating surface shape centered on an axis perpendicular to the reference surface P as a three-dimensional convex curved surface shape. Note that the first support surface 2a is not limited to a configuration forming a rotating surface shape.

[0017] The tube 7 is an elbow tube in which the curved portion 7a bends at a right angle and forms a curved cylindrical shape. Note that the tube 7 is not limited to an elbow tube, and may have a configuration in which the curved portion 7a bends at an acute angle or an obtuse angle. Further, the tube 7 is not limited to a curved cylindrical shape, and may have a configuration forming, for example, a curved elliptical cylindrical shape, a curved rectangular cylindrical shape, or the like.

[0018] The central longitudinal section of the tube 7 means a planar cross section including the central axis of the tube 7 that curves and extends in the length direction of the tube 7. FIG. 2 shows the external appearance when viewed in a direction perpendicular to the central longitudinal section of the tube 7.

[0019] The second support surface 3a has a three-dimensional convex curved shape that protrudes in a direction perpendicular to the reference plane P, and abuts against the curved portion 7a of the pipe 7 on the outside of the curve and on the side opposite to the central longitudinal section of the pipe 7. As a three-dimensional convex curved shape, the second support surface 3a has a rotational shape centered on an axis perpendicular to the reference plane P. However, the second support surface 3a is not limited to having a rotational shape.

[0020] The third support surface 4a has a three-dimensional convex curved shape that protrudes in a direction perpendicular to the reference plane P, and abuts the curved portion 7a of the pipe 7 on the outside of the curve, on one side relative to the central longitudinal section of the pipe 7, and on one side in the longitudinal direction of the pipe 7 relative to the first support surface 2a and the second support surface 3a. As a three-dimensional convex curved shape, the third support surface 4a has a rotational shape centered on an axis perpendicular to the reference plane P. However, the third support surface 4a is not limited to having a rotational shape.

[0021] The fourth support surface 5a has a three-dimensional convex curved shape that protrudes in a direction perpendicular to the reference plane P, and abuts the curved portion 7a of the pipe 7 on the outside of the curve, on the other side with respect to the central longitudinal section of the pipe 7, and on one side in the longitudinal direction of the pipe 7 with respect to the first support surface 2a and the second support surface 3a. The fourth support surface 5a, as a three-dimensional convex curved shape, has a rotational surface shape centered on an axis perpendicular to the reference plane P. However, the fourth support surface 5a is not limited to having a rotational surface shape.

[0022] The first support surface 2a and the second support surface 3a are positioned on a common axis (first common axis X1) perpendicular to the central longitudinal section of the pipe 7. More specifically, the first support surface 2a and the second support surface 3a are positioned so as to be aligned in a direction perpendicular to the central longitudinal section of the pipe 7. However, the arrangement of the first support surface 2a and the second support surface 3a is not limited to this; for example, they may be positioned on the first common axis X1 but not aligned in a direction perpendicular to the central longitudinal section of the pipe 7, or they may not be positioned on the first common axis X1.

[0023] The third support surface 4a and the fourth support surface 5a are positioned on a common axis (second common axis X2) perpendicular to the central longitudinal section of the pipe 7. More specifically, the third support surface 4a and the fourth support surface 5a are positioned so as to be aligned in a direction perpendicular to the central longitudinal section of the pipe 7. However, the arrangement of the third support surface 4a and the fourth support surface 5a is not limited to this; for example, they may be positioned on the second common axis X2 but not aligned in a direction perpendicular to the central longitudinal section of the pipe 7, or they may not be positioned on the second common axis X2.

[0024] The first support surface 2a and the third support surface 4a are positioned on a common axis (third common axis X3) parallel to the central longitudinal section of the pipe 7. More specifically, the first support surface 2a and the third support surface 4a are positioned so as to be aligned in a direction parallel to the central longitudinal section of the pipe 7. However, the arrangement of the first support surface 2a and the third support surface 4a is not limited to this; for example, they may be positioned on the third common axis X3 but not aligned in a direction parallel to the central longitudinal section of the pipe 7, or they may not be positioned on the third common axis X3.

[0025] The second support surface 3a and the fourth support surface 5a are positioned on a common axis (fourth common axis X4) parallel to the central longitudinal section of the pipe 7. More specifically, the second support surface 3a and the fourth support surface 5a are positioned so as to be aligned in a direction parallel to the central longitudinal section of the pipe 7. However, the arrangement of the second support surface 3a and the fourth support surface 5a is not limited to this; for example, they may be positioned on the fourth common axis X4 but not aligned in a direction parallel to the central longitudinal section of the pipe 7, or they may not be positioned on the fourth common axis X4.

[0026] The first support surface 2a, the second support surface 3a, the third support surface 4a, and the fourth support surface 5a are positioned on a common plane parallel to the reference plane P. More specifically, the first support surface 2a, the second support surface 3a, the third support surface 4a, and the fourth support surface 5a are positioned so that their heights are the same from the reference plane P. However, the arrangement of the first support surface 2a, the second support surface 3a, the third support surface 4a, and the fourth support surface 5a is not limited to this; for example, they may be arranged on the common plane even if their heights are not the same from the reference plane P, or they may not be arranged on the common plane at all.

[0027] The rotation axis 6 fixes the curved portion 7a of the pipe 7 via the first support surface 2a, the second support surface 3a, the third support surface 4a, and the fourth support surface 5a, and rotates the pipe 7 around a rotation axis O that is inclined at an angle of 45° with respect to the reference plane P. The rotation axis O may be configured to be inclined at an angle other than 45° with respect to the reference plane P.

[0028] The rotating shaft 6 is rotated around the axis of rotation O by a drive device (not shown). The configuration of the drive device is not particularly limited.

[0029] The curved pipe rotating device 1 has a holding portion 8 that integrally holds the first support surface 2a, the second support surface 3a, the third support surface 4a, and the fourth support surface 5a. The holding portion 8 has a holding plate portion 9 that is flat and parallel to the reference plane P, and a first support portion 2, a second support portion 3, a third support portion 4, and a fourth support portion 5 that protrude from the holding plate portion 9. The first support surface 2a is formed by the tip surface of the first support portion 2, the second support surface 3a is formed by the tip surface of the second support portion 3, the third support surface 4a is formed by the tip surface of the third support portion 4, and the fourth support surface 5a is formed by the tip surface of the fourth support portion 5. Note that the holding portion 8 is not limited to having a holding plate portion 9 that is flat and parallel to the reference plane P.

[0030] The first support section 2, the second support section 3, the third support section 4, and the fourth support section 5 each have a three-dimensional convex curved end wall and a peripheral wall closed at one end by the end wall, with the other end of the peripheral wall integrally connected to the retaining plate section 9. By adopting such a hollow structure, weight reduction can be achieved. However, the configuration of the first support section 2, the second support section 3, the third support section 4, and the fourth support section 5 is not limited to this, and a solid structure may be adopted, for example.

[0031] The first support part 2, the second support part 3, the third support part 4, and the fourth support part 5 are each made of metal such as steel (preferably stainless steel that does not require painting). By making the first support part 2, the second support part 3, the third support part 4, and the fourth support part 5 out of metal, their high rigidity enables precise and stable fixing of the pipe 7. However, the first support part 2, the second support part 3, the third support part 4, and the fourth support part 5 are not limited to being made of metal.

[0032] The holding portion 8 has a pair of restraint member fixing portions 11 into which both ends of a U-bolt 10, which serves as a restraint member that restrains the curved portion 7a of the pipe 7 to the holding portion 8, are inserted. Each restraint member fixing portion 11 is composed of multiple holes to accommodate U-bolts 10 of multiple dimensions corresponding to multiple pipes 7 of different diameters. In this embodiment, the number of holes constituting each restraint member fixing portion 11 is three, but is not limited to this and can be appropriately set according to the number of different dimensions of U-bolts 10 used. Each restraint member fixing portion 11 is not limited to multiple holes; for example, it may be composed of elongated holes as shown in the second embodiment in Figures 5 to 7.

[0033] The U-shaped bolt 10 is placed on the inside of the curve in the curved portion 7a of the pipe 7, which is supported by the first support surface 2a, the second support surface 3a, the third support surface 4a, and the fourth support surface 5a. With both ends inserted into a pair of restraint member fixing parts 11, nuts 12 are fastened to both ends to fix the curved portion 7a of the pipe 7 to the holding part 8.

[0034] The pair of restraint member fixing parts 11 are provided in the longitudinal direction of the pipe 7 between the first support surface 2a and the second support surface 3a and the third support surface 4a and the fourth support surface 5a. More specifically, the pair of restraint member fixing parts 11 are provided so as to be located on a common axis (fifth common axis X5) perpendicular to the central longitudinal section of the pipe 7, and the fifth common axis X5 is located between the first common axis X1 and the second common axis X2 in the longitudinal direction of the pipe 7. More specifically, the fifth common axis X5 is located midway between the first common axis X1 and the second common axis X2 in the longitudinal direction of the pipe 7, and the pair of restraint member fixing parts 11 are provided so as to be aligned in a direction perpendicular to the central longitudinal section of the pipe 7.

[0035] The arrangement of the pair of restraint member fixing parts 11 is not limited to this. For example, the fifth common axis X5 may be positioned anywhere other than midway between the first common axis X1 and the second common axis X2 in the longitudinal direction of the pipe 7. Alternatively, the pair of restraint member fixing parts 11 may be located on the fifth common axis X5, but not aligned perpendicular to the central longitudinal section of the pipe 7. Or, the pair of restraint member fixing parts 11 may not be located on the fifth common axis X5.

[0036] The restraining member that secures the curved portion 7a of the pipe 7 to the holding portion 8 may be a member other than the U-bolt 10, such as a band. In this case, the configuration of the restraining member fixing portion 11 can be appropriately set according to the configuration of the restraining member. The restraining member fixing portion 11 may also be provided in a part other than the holding portion 8.

[0037] According to the curved pipe rotating device 1, the curved portions 7a of multiple pipes 7 of different diameters are sequentially fixed to the rotating shaft 6, and the portion 7b on one end of the pipe 7 (i.e., the length of the pipe 7 relative to the curved portion 7a) one endThe portion located on the side can be rotated on the axis of rotation O (i.e., the curved pipe rotation method of the embodiment of the present invention can be performed). Furthermore, since the curved pipe rotation device 1 has a three-dimensional convex curved first support surface 2a, a second support surface 3a, a third support surface 4a, and a fourth support surface 5a, it can be adapted to the curved portion 7a of multiple pipes 7 of different diameters in such a way that the runout between the one end portion 7b of the pipe 7 and the axis of rotation O is reduced.Therefore, the curved pipe rotation device 1 makes it easy to perform processing such as welding or cutting over the entire circumference of the one end portion 7b of the pipe 7.

[0038] For example, in the case of welding as shown in Figure 4, if there is a large runout, the processing tool 13 needs to be moved up and down a large amount as shown in Figure 4(b), making processing difficult. In contrast, if there is no runout, as shown in Figure 4(a), there is no need to move the processing tool 13 up and down, making processing easy.

[0039] Furthermore, the type of welding that can be performed using the curved pipe rotating device 1 is not particularly limited and includes, for example, non-consumable electrode type gas shielded arc welding called GTAW (Gas Tungsten Arc welding), such as TIG welding (Tungsten Inert Gas welding) or plasma arc welding, and consumable electrode type welding called GMA (Gas Metal Arc) welding, such as MAG (Metal Active Gas), MIG (Metal Inert Gas), or CO2 welding.

[0040] The diameter of the pipe 7 to which the curved pipe rotating device 1 is fitted is not particularly limited, but for example, the curved pipe rotating device 1 can be configured to fit two or more of the pipes 7 with outer diameters such as φ114.3 mm, φ139.8 mm, φ165.2 mm, φ216.3 mm, φ267.4 mm, φ318.5 mm, and φ355.6 mm.

[0041] The curved pipe rotating device 1 may be configured such that, as in the second embodiment shown in Figures 5 to 7, a hole 14 (e.g., a through hole) is provided in the holding part 8 to avoid interference with the curved portion 7a of the pipe 7, in order to fit a narrow pipe 7.

[0042] The curved pipe rotating device 1, for example, as shown in the third embodiment in Figures 8-9 and the fourth embodiment in Figures 10-11, holds the holding part 8 relative to the rotation axis 6 within the central longitudinal section of the pipe 7. rotate axis line O The configuration may include an adjustment mechanism 16 that is connected in a position adjustable in a direction not parallel to the pipes. With such a configuration, the adjustment mechanism 16 can be used individually for multiple pipes 7 of different diameters as needed, thereby reducing runout.

[0043] In the third embodiment, the adjustment mechanism 16 holds the holding part 8 relative to the rotation axis 6 within the central longitudinal section of the pipe 7. rotate axis line O The holder is connected in a position adjustable direction relative to the reference plane P. More specifically, the holder 8 is a flat plate parallel to the reference plane P and is positioned in a direction along the reference plane P within the central longitudinal section of the pipe 7 by the adjustment mechanism 16. The adjustment mechanism 16 includes a sliding mechanism 16a that slides the holder 8 for position adjustment.

[0044] In the fourth embodiment, the adjustment mechanism 16 holds the holding part 8 relative to the rotation axis 6 within the central longitudinal section of the pipe 7. rotate axis line O It is connected so as to be positionable in a direction perpendicular to it. More specifically, the holding part 8 has a connecting part 15 that is integrally connected to the holding plate part 9, and the connecting part 15 is adjusted by an adjustment mechanism 16 within the central longitudinal section of the pipe 7 rotate axis line O The position is adjusted in a direction perpendicular to it. The adjustment mechanism 16 includes a sliding mechanism 16a that slides the connecting portion 15 for position adjustment.

[0045] The present invention is not limited to the embodiments described above, and can be modified in various ways without departing from its essence.

[0046] Therefore, the curved pipe rotating device 1 of the above-described embodiment has a three-dimensional convex curved surface shape projecting in a direction perpendicular to the planar reference plane P, and a first support surface 2a that abuts the curved portion 7a of the pipe 7 on the outside of the curve and on one side with respect to the central longitudinal section of the pipe 7, and a second support surface 3a that has a three-dimensional convex curved surface shape projecting in a direction perpendicular to the reference plane P, and a second support surface 3a that abuts the curved portion 7a of the pipe 7 on the outside of the curve and on the other side with respect to the central longitudinal section of the pipe 7, and a third support surface 2a that has a three-dimensional convex curved surface shape projecting in a direction perpendicular to the reference plane P, and a third support surface 3a that abuts the curved portion 7a of the pipe 7 on the outside of the curve, on one side with respect to the central longitudinal section of the pipe 7 and The curved pipe rotating device 1 can be modified as long as it has a third support surface 4a that abuts against the second support surface 3a on one side in the longitudinal direction of the pipe 7, a fourth support surface 5a that has a three-dimensional convex curved shape projecting in a direction perpendicular to the reference plane P and abuts against the curved portion 7a of the pipe 7 on the outside of the curve, on the other side with respect to the central longitudinal section of the pipe 7, and on the one side in the longitudinal direction of the pipe 7 with respect to the first support surface 2a and the second support surface 3a, and a rotating shaft 6 that fixes the curved portion 7a of the pipe 7 via the first support surface 2a, the second support surface 3a, the third support surface 4a and the fourth support surface 5a and rotates the pipe 7 around a rotation axis O that is inclined with respect to the reference plane P. [Explanation of symbols]

[0047] 1. Curved pipe rotating device 2 First support part 2a 1st support surface 3 Second support part 3a Second support surface 4 Third support part 4a Third support surface 5 4th support part 5a 4th support surface 6 rotation axes 7 tubes 7a Curved section 7b One end part 8 Holding part 9 Holding plate part 10 U-bolts 11 Restraint member fixing part 12 nuts 13 Machining Tools 14 holes 15 Connecting part 16. Adjustment mechanism 16a スライド Organization O Rotation axis P reference plane X1 First Common Axis X2 Second Common Axis X3 Third Common Axis X4 Fourth Common Axis X5 Fifth Common Axis

Claims

1. It has a three-dimensional convex curved surface that protrudes in a direction perpendicular to a planar reference plane, and has a first support surface that abuts the curved portion of the pipe on the outside of the curve and on one side relative to the central longitudinal section of the pipe, A third-dimensional convex curved surface projecting in a direction perpendicular to the reference plane, and a second support surface that abuts the curved portion of the pipe on the outside of the curve and on the other side of the central longitudinal section of the pipe, A three-dimensional convex curved surface projecting in a direction perpendicular to the reference surface, a third support surface that abuts the curved portion of the pipe on the outside of the curve, on one side of the central longitudinal section of the pipe, and on one side in the longitudinal direction of the pipe relative to the first support surface and the second support surface, A third-dimensional convex curved surface projecting in a direction perpendicular to the reference surface, a fourth support surface that abuts the curved portion of the pipe on the outside of the curve, on the other side of the central longitudinal section of the pipe, and on one side of the pipe in the longitudinal direction relative to the first support surface and the second support surface, A curved pipe rotating device having a first support surface, a second support surface, a third support surface, and a fourth support surface to fix the curved portion of the pipe, and a rotating shaft for rotating the pipe about a rotation axis inclined with respect to a reference surface.

2. A holding portion that integrally holds the first support surface, the second support surface, the third support surface, and the fourth support surface, The curved pipe rotating device according to claim 1, further comprising an adjustment mechanism that connects the holding portion to the rotation axis so as to be positionable in a direction not parallel to the rotation axis within the central longitudinal cross-section of the pipe.

3. It has a holding portion that integrally holds the first support surface, the second support surface, the third support surface, and the fourth support surface, The holding part has a pair of restraint member fixing parts through which both ends of a U-bolt, which serves as a restraint member for restraining the curved portion of the pipe to the holding part, The curved pipe rotating device according to claim 1, wherein each of the restraint member fixing portions is composed of multiple holes or elongated holes to accommodate U-bolts of multiple dimensions corresponding to multiple pipes of different diameters.

4. A method for rotating a curved pipe, comprising sequentially fixing the curved portions of a plurality of pipes of different diameters to the rotation axis of the curved pipe rotating device according to any one of claims 1 to 3, and rotating one end portion of the pipe on the rotation axis.

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