Pipe processing apparatus and pipe processing method

Abstract

To provide a device and a method for machining a pipe, which facilitate alignment between the pipe to be machined and the machining device.SOLUTION: This device for machining a pipe comprises: a machining machine for machining an end of the pipe; a positioning saddle for positioning the pipe so as to align the pipe with the machining machine; a pressing unit that is provided on a side opposite the positioning saddle holding the pipe therebetween and that presses the pipe toward the positioning saddle; and an operation unit that operates the pressing unit or the positioning saddle manually or using a tool so as to press the pipe to the positioning saddle by the pressing unit. The operation unit is configured to be accessible from the positioning saddle side.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a pipe processing apparatus and a pipe processing method.

Background Art

[0002] When performing butt welding between pipe ends or the like, beveling is performed to form a bevel at the pipe end.

[0003] Patent Document 1 discloses a beveling apparatus including a core adjustment bed on which a pipe to be processed is placed and a pipe presser provided on the opposite side of the core adjustment bed with the pipe sandwiched therebetween. In this beveling apparatus, the pipe is pressed and fixed from the outside by the core adjustment bed and the pipe presser, so that alignment between the rotation axis of the beveling machine and the pipe is performed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, it has been proposed to perform repair work on the furnace wall pipes of a boiler or the like from the outside of the furnace. By working from the outside of the furnace, it is not necessary to provide a scaffold inside the furnace, so that the man-hours required for repair and the like can be reduced compared to the case of working from the inside of the furnace.

[0006] On the one hand, when working from the outside of the furnace, in a conventional processing device such as that described in Patent Document 1, due to the configuration of the device, centering between the processing device and the pipe is performed based on the portion of the pipe inside the furnace among the pipes to be processed. Here, the portion of the pipe inside the furnace is exposed to high-temperature combustion gas during the operation of the boiler. Therefore, in a boiler that has been operated for a particularly long time, it may be thinned due to corrosion or the like. In that case, if centering is performed based on the portion of the pipe inside the furnace, the center of the processing device and the pipe will be displaced, making it difficult to perform appropriate beveling. When the remaining pipe (existing pipe) and the new pipe are displaced, a step will occur. In particular, when the inner surfaces of the pipes are displaced (misaligned), defects are likely to occur during welding.

[0007] In view of the above circumstances, at least one embodiment of the present invention aims to provide a pipe processing device and a pipe processing method that facilitate centering between a pipe to be processed and a processing device.

Means for Solving the Problems

[0008] The pipe processing device according to at least one embodiment of the present invention includes: a processing machine for processing the end of the pipe; a positioning saddle for positioning the pipe so as to center the processing machine and the pipe; a pressing portion provided on the side opposite to the positioning saddle with the pipe sandwiched therebetween, for pressing the pipe toward the positioning saddle; an operation portion for manually or using a tool to operate the pressing portion or the positioning saddle so that the pipe is pressed against the positioning saddle by the pressing portion; and is provided with the operation portion is configured to be accessible from the positioning saddle side.

[0009] Moreover, the pipe processing method according to at least one embodiment of the present invention is a method for processing the end of a pipe using a processing device including a processing machine, a positioning saddle for positioning the pipe with respect to the processing machine, and the pressing portion for pressing the pipe toward the positioning saddle. A positioning step of positioning the pipe to be processed along the positioning saddle and aligning the processing machine with the pipe in the axial direction of the pipe; An operation step of operating the pressing portion or the positioning saddle by an operation from the positioning saddle side to bring the pipe into a state of being pressed against the positioning saddle by the pressing portion; A processing step of processing an end portion of the pipe using the processing machine while the pipe is pressed against the positioning saddle by the pressing portion; It is provided with.

Advantages of the Invention

[0010] According to at least one embodiment of the present invention, there is provided a pipe processing apparatus and a pipe processing method that facilitate alignment between a pipe to be processed and a processing apparatus.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0012] Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples.

[0013] (Configuration of Processing Apparatus) FIG. 1 is a schematic diagram of a tube processing apparatus according to an embodiment. FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1. The processing apparatus 1 shown in FIG. 1 is an apparatus for processing an end portion 51 of a tube 50 to be processed. The tube 50 to be processed may be, for example, a furnace wall tube constituting the furnace wall of a boiler (such as a coal-fired boiler or a soda recovery boiler).

[0014] As shown in FIG. 1, the processing apparatus 1 includes a processing machine 20, a positioning saddle 4, a pressing portion 6, and an operation portion 8.

[0015] The processing machine 20 is configured to process the end portion 51 of the tube 50 to be processed. The processing machine 20 shown in FIG. 1 includes a tool holder 22 supported by a main body portion 2, a tool 24 attached to the tool holder 22, and a motor 34 for driving the tool 24.

[0016] The tool holder 22 and the cutting tool 24 are configured to be rotatable around the rotation axis O together with the rotating shaft 23. The output shaft 32 of the motor 34 is connected to the cutting tool 24 via a power transmission mechanism. In the illustrated embodiment, the power transmission mechanism includes a shaft 30 extending in the axial direction, a bevel gear 31 provided between the output shaft 32 and the shaft 30, and gears 29, 27 provided between the shaft 30 and the rotating shaft 23. The rotation of the motor 34 is transmitted to the rotating shaft 23 of the processing machine 20 via the power transmission mechanism. In this way, the tool holder 22 and the cutting tool 24 are rotationally driven by the motor 34. Note that in FIG. 1, the motor 34 is housed in a motor casing 36. Note that in some embodiments, the power transmission mechanism may include a bevel gear as in the above-described embodiment, or may include a flexible shaft or a link mechanism or the like.

[0017] The positions of the tool holder 22 and the cutting tool 24 in the axial direction can be adjusted by a position adjustment handle 38.

[0018] The cutting tool 24 shown in FIG. 1 is a tool bit 26 for cutting the end of a pipe 50. By operating the position adjustment handle 38 to adjust the position of the tool bit 26 in the axial direction and rotating the tool bit 26 around the rotation axis O by the motor 34, a bevel for butt welding can be formed at the end of the pipe 50.

[0019] The positioning saddle 4 is for positioning the pipe 50 so as to align the pipe 50 with the processing machine 20. As shown in FIG. 1, the positioning saddle 4 is attached to the protruding portion 2A of the main body portion 2 that protrudes along a direction orthogonal to the central axis O of the processing machine 20 toward the central axis O. Further, as shown in FIGS. 1 and 2, the positioning saddle 4 extends in the axial direction of the processing machine 20 and has a shape capable of supporting the circular pipe 50 at two or more points when viewed in the axial direction. Thereby, relative positioning of the pipe 50 with respect to the positioning saddle 4 is possible. The shape and position of the positioning saddle 4 are set so that the central axis Q of the pipe 50 coincides with the central axis O of the processing machine according to the outer diameter of the pipe 50 to be processed.

[0020] The positioning saddle 4 shown in FIG. 2 has a Y-shaped cross-sectional shape orthogonal to the axial direction of the processing machine 20, but the shape of the positioning saddle 4 is not limited to this. The positioning saddle 4 may have, for example, an arc shape corresponding to the outer surface of the pipe 50 to be processed.

[0021] The pressing portion 6 is provided on the side opposite to the positioning saddle 4 with the pipe 50 interposed therebetween, and is configured to press the pipe toward the positioning saddle 4. The pressing portion 6 shown in FIG. 1 is provided at the end of the first shaft 10 having a male thread formed on the outer surface. The first shaft 10 is provided on the main body portion 2 and is screwed into the threaded hole 9 having a female thread formed therein. By screwing the first shaft 10 into the threaded hole 9, the pipe 50 can be pressed toward the positioning saddle 4 via the pressing portion 6.

[0022] The operating portion 8 is used to manually or using a tool (such as a wrench) operate the pressing portion 6 or the positioning saddle 4 so that the pipe 50 is pressed against the positioning saddle 4 by the pressing portion 6.

[0023] The operation unit 8 shown in FIG. 1 includes a handle 7 for operating the pressing part 6. The handle 7 is provided at one end of a second shaft 12 extending along the axial direction of the pipe 50 (or the axial direction of the processing machine 20). The second shaft 12 is supported by the main body 2 via a support part 14. A power transmission mechanism is provided between the second shaft 12 and the first shaft 10, and the rotation of the handle 7 by an operator or the like is transmitted to the first shaft 10 via the second shaft 12 and the power transmission mechanism. Therefore, by rotating the handle 7, it is possible to screw the first shaft 10 into the screw hole 9. In the illustrated embodiment, the above-described power transmission mechanism includes a bevel gear 11. In some embodiments, the above-described power transmission mechanism may include a flexible shaft or a link mechanism.

[0024] Although not particularly illustrated, in some embodiments, the operation unit 8 may be used to operate the positioning saddle 4 so that the pipe 50 is pressed against the positioning saddle 4 by the pressing part 6.

[0025] Note that a holding part 16 is provided on the positioning saddle 4 side of the main body 2 of the processing machine 20, and an operator can grasp the holding part 16 to perform various operations.

[0026] In some embodiments, the operation unit 8 is configured to be accessible from the positioning saddle 4 side. That is, the operation unit 8 is provided at a position accessible to an operator on the positioning saddle 4 side of the processing device 1.

[0027] For example, in the exemplary embodiment shown in FIG. 1, the operation unit 8 is located offset from the region R1 including the processing machine 20, the positioning saddle 4, and the pressing part 6 in the axial direction of the pipe 50 (or the axial direction of the processing machine 20). For this reason, an operator on the positioning saddle 4 side of the processing device 1 can access the operation unit 8 (handle 7) without being obstructed by the processing machine 20, the positioning saddle 4, and the pressing part 6.

[0028] When performing work such as repairing the furnace wall from the outside of the furnace, in a conventional processing device, due to the device configuration, centering of the processing device and the pipe is performed based on the portion of the pipe inside the furnace among the pipes to be processed. Here, the portion of the pipe inside the furnace may be thinned due to corrosion or the like because it is exposed to high-temperature combustion gas during the operation of the boiler. In this case, if centering is performed based on the portion of the pipe 50 that has been thinned inside the furnace as shown in FIG. 3, for example, the central axis O of the processing machine and the central axis Q of the pipe will be misaligned, making it difficult to perform appropriate beveling.

[0029] Note that FIG. 3 is a diagram corresponding to the A-A cross-section of FIG. 1 in a typical processing device. In FIG. 3, the positioning saddle 4' is located inside the furnace, and the pressing portion 6' is located outside the furnace. Also, the dashed line of 50' indicates the position of the outer surface of the pipe 50 before thinning.

[0030] On the other hand, unlike the inner portion of the furnace wall pipe of the boiler, the outer portion of the furnace wall pipe of the boiler is not directly exposed to high-temperature combustion gas during the operation of the boiler, so thinning due to corrosion or the like is unlikely to occur. In this regard, in the configuration according to the above-described embodiment, the operation unit 8 for pressing the pipe 50 (such as the furnace wall pipe) against the positioning saddle 4 by the pressing portion 6 is accessible from the positioning saddle 4 side, which is the reference for centering between the pipe 50 and the processing machine 20. Therefore, with the positioning saddle 4 located outside the furnace and the pressing portion 6 located inside the furnace, the operation unit 8 can be operated from the outside of the furnace (i.e., the positioning saddle 4 side) to bring the pipe 50 into a state where it is pressed against the positioning saddle 4 by the pressing portion 6. Thus, even when working from the outside of the furnace, as shown in FIG. 2, appropriate centering can be performed based on the outer portion of the pipe 50 (that is, the positions of the central axis O of the processing machine 20 and the central axis Q of the pipe 50 can be aligned), and thereby, the end portion 51 of the pipe 50 can be appropriately processed.

[0031] Note that for a new pipe without thinning due to corrosion or the like, the center of the outer diameter and the center of the inner diameter coincide. Therefore, when such a new pipe is the object to be processed, appropriate centering between the pipe and the processing machine can be performed based on either the outer portion or the inner portion of the pipe.

[0032] FIG. 4 is a view corresponding to the A-A cross section of FIG. 1 in the processing apparatus according to an embodiment. In FIG. 4, the tube 50 to be processed is a tube provided with a build-up portion 52 for corrosion protection on the inner furnace side portion. In the processing apparatus 1 according to the above-described embodiment, since appropriate centering can be performed with reference to the outer furnace side portion of the tube 50, as shown in FIG. 4, even when the wall thickness of the inner furnace side portion of the tube 50 is thicker than that of the outer furnace side portion, appropriate centering can be performed.

[0033] In the exemplary embodiment shown in FIG. 1, the rotation axis O of the cutting tool 24 extends along the axial direction of the tube 50, and the output shaft 32 of the motor 34 for driving the processing machine 20 extends in a direction intersecting the axial direction of the tube 50 (or the axial direction of the processing machine 20). And, as described above, the output shaft 32 and the cutting tool 24 are connected to each other via a power transmission mechanism (such as a bevel gear 31).

[0034] According to the above configuration, since the extending direction of the output shaft 32 of the motor 34 for driving the cutting tool 24 is set to a direction along the direction intersecting the rotation axis O of the cutting tool 24, compared with the case where the cutting tool 24 is directly connected to the output shaft 32 of the motor 34, it is easy to reduce the size of the processing apparatus 1 in the rotational axis direction of the cutting tool 24 (that is, in the axial direction of the tube 50). Therefore, the length in the axial direction of the cutting area of the furnace wall required to provide the installation space for the processing apparatus 1 can be shortened. Thus, the time required for repairing the furnace wall can be shortened.

[0035] FIG. 5 is an enlarged view showing a portion of the cutting tool 24 of the processing apparatus 1 according to an embodiment. FIGS. 6 and 7 are respectively the B-B cross sections of FIG. 5. In some embodiments, the processing apparatus 1 is configured such that the cutting tool 24 of the processing machine 20 is replaceable. For example, in the processing apparatus 1 shown in FIG. 1, the tool bit 26 (cutting tool 24) of the processing machine 20 and the drill 28 shown in FIG. 5 may be exchangeable.

[0036] As shown in FIGS. 5 and 6, when ribs 54 are provided on the inner surface of a tube 50 such as a furnace wall tube, before the tip processing of the tube 50, by removing the ribs 54 at the end 51 of the tube 50, the accuracy of the tip processing can be improved. Therefore, a drill 28 is attached to the tool holder 22 of the processing apparatus 1, and by rotating the drill 28 around the rotation axis O, as shown in FIG. 7, the rib at the end 51 of the tube 5 0 can be cut and removed.

[0037] In this way, by using the processing apparatus 1 with the drill 28 attached, the time required to remove the ribs can be shortened compared to the case where the ribs are removed by manual polishing. Also, in the above-described embodiment, by replacing the tool 24, both the removal of the ribs and the tip processing can be performed with a single processing apparatus 1. Therefore, the time required for processing the end of the tube 50 can be more effectively shortened.

[0038] (Flow of processing method / repair method) Hereinafter, a repair method for a furnace wall tube including a tube processing method according to an embodiment will be described. FIG. 8 is a flowchart of a repair method for a furnace wall tube including a tube processing method according to an embodiment. FIGS. 9 to 12 are schematic views of the furnace wall showing the process of a repair method for a furnace wall tube including a tube processing method according to an embodiment, respectively.

[0039] In one embodiment, first, before step S2 shown in FIG. 8, based on a location where damage such as wall thickness reduction or cracks has occurred among a plurality of furnace wall tubes 62 that make up the furnace wall 61, a repair target tube 62A (the tube 50 to be processed) and the tube replacement range 66 of the repair target tube 62A are determined (see FIG. 9). The tube replacement range 66 is a portion that will be replaced with a new tube according to the procedure described later. The number of repair target tubes 62A to be repaired in a single operation is not limited.

[0040] Note that, as shown in FIG. 9, markings 70 (shown by broken lines in FIG. 9) indicating the tube replacement range 66 and the fin cutting portion 68 may be applied.

[0041] Next, of the pipe replacement range 66 of the pipe 62A to be repaired determined by the above-described procedure and the fins 64 connected to the pipe 62A to be repaired, a fin cutting portion 68 that extends over a wider range than the pipe replacement range 66 in the longitudinal direction of the furnace wall pipe 62 is cut and removed using an arbitrary cutting device (step S2).

[0042] When the pipe replacement range 66 and the fin cutting portion 68 are removed from the pipe 62A to be repaired and the fins 64 in step S2, as shown in FIG. 10, an opening hole 76 that communicates the outside of the furnace (one side of both sides of the furnace wall 61) and the inside of the furnace (the other side of both sides of the furnace wall 61) of the boiler is formed in the furnace wall 61. Also, a pair of cut ends 72, 72 are formed at the cutting locations of the pipe replacement range 66 of each pipe 62A to be repaired, and a gap 74 is formed between each pipe 62A to be repaired and the furnace wall pipe 62 (which may be another pipe 62A to be repaired) adjacent to the pipe 62A to be repaired. The gap 74 is formed at a position corresponding to the fin cutting portion 68 removed in step S2, and extends over a wider range than the range between the pair of cut ends 72, 72 in the longitudinal direction of the furnace wall pipe 62.

[0043] Next, using the processing device 1 described above, the rib provided on the inner surface of the end portion including the cut end 72 of the pipe 62A (pipe 50) to be repaired is removed (step S4; see FIGS. 6 and 7). In step S4, the pipe 62A to be repaired is positioned along the positioning saddle 4 of the processing device 1 so that the processing machine 20 and the pipe 62A to be repaired are aligned axially. Then, the handle 7 (operation unit 8) is operated by an operation from the outside of the furnace (positioning saddle side) to press the pipe 62A to be repaired against the positioning saddle 4 by the pressing portion 6. A drill 28 (see FIG. 5) is attached to the tool holder 22 of the processing machine 20. Then, with the pipe 62A to be repaired pressed against the positioning saddle 4 by the pressing portion 6, the drill 28 is driven to cut and remove the rib at the end portion of the pipe 62A to be repaired.

[0044] Next, using the processing device 1 described above, beveling of the end portion including the cut end 72 of the pipe 62A (pipe 50) to be repaired is performed (step S6). In step S6, the drill 28 is removed from the tool holder 22 of the processing device 1, and a tool bit 26 (see FIG. 1) for beveling is attached to the tool holder 22. Then, with the pipe 62A to be repaired pressed against the positioning saddle 4 by the pressing portion 6, the tool bit 26 is driven to perform beveling of the end portion of the pipe 62A to be repaired.

[0045] In the case where the end portion of the pipe 62A to be processed is thinned, for example, before performing steps S4 and S6, build-up welding may be performed on the end portion of the pipe 62A to be repaired. Here, for example, using a welding machine capable of welding along the circumferential direction of the pipe 62A to be repaired, build-up welding may be performed over one circumference at the end portion of the pipe 62A to be repaired.

[0046] When butt welding with another pipe is performed after beveling of the pipe while a part of the end portion of the pipe to be processed is thinned, at the portion where the pipe thickness is thin, the shielding gas supplied during welding may be disturbed and outside air (air) may enter the welding location, resulting in welding defects. In this regard, as described above, by performing build-up welding on the end portion of the pipe 62A to be repaired before aligning the axes of the processing machine and the pipe 62A to be repaired, the beveling of the pipe 62A to be repaired in step S6 and the subsequent butt welding can be performed with the pipe thickness increased. Therefore, welding defects that may occur when the pipe thickness is thin can be effectively suppressed.

[0047] Next, the new pipe 77 is installed such that both ends 78, 78 (see FIG. 11) of the new pipe 77 face the pair of cut ends 72, 72 of the pipe 62A to be repaired, alignment is performed so that the central axis of the pipe 62A to be repaired and the central axis of the new pipe 77 overlap, and the cut end 72 of the pipe 62A to be repaired and the new pipe 77 are connected by welding (step S8). Note that the alignment and welding of the pipe 62A to be repaired and the new pipe 77 can be performed using, for example, the device described in Japanese Patent Application Laid-Open No. 2021-107747.

[0048] As shown in FIG. 11, in the state where step S8 has ended, in the repair portion 100 of the furnace wall 61, a new pipe 77 is connected to the cut end 72 of the pipe to be repaired 62A via a welded portion 79 formed by welding in step S8, and a fin cutting region 104 where fins 64 are cut at a position corresponding to the fin cutting portion 68 (see FIG. 9).

[0049] Next, the fin portion 82 (see FIG. 12) corresponding to the fin cutting portion 68 is fitted into the fin cutting region 104 and welded to close the fin cutting region 104. At this time, as shown in FIG. 12, the fin portion 82 is welded to the adjacent fins 64 in the longitudinal direction of the furnace wall pipe 62, and is welded to the furnace wall pipes 62, the pipe to be repaired 62A, and the new pipe 77 located on both sides of the fin portion 82 in the arrangement direction (direction orthogonal to the longitudinal direction) of the furnace wall pipes 62. Thereby, a welded portion 84 is formed along the outer edge of the fin portion 82.

[0050] By the method described above, the repair work of the furnace wall pipe 62 (including the beveling of the pipe to be repaired 62A using the processing device 1) can be performed by the work outside the furnace.

[0051] The content described in each of the above embodiments is understood as follows, for example.

[0052] (1) The pipe processing device (1) according to at least one embodiment of the present invention includes a processing machine (20) for processing an end portion (51) of a pipe (50), a positioning saddle (4) for positioning the pipe so as to align the processing machine with the pipe, a pressing portion (6) provided on the opposite side of the positioning saddle with the pipe sandwiched therebetween, for pressing the pipe toward the positioning saddle, and an operation portion (8) for manually or using a tool to operate the pressing portion or the positioning saddle so that the pipe is pressed against the positioning saddle by the pressing portion, and is provided with the operation portion is configured to be accessible from the positioning saddle side.

[0053] Unlike the inner furnace part of the boiler furnace wall tube, the outer furnace part of the boiler furnace wall tube is not directly exposed to high-temperature combustion gas during the operation of the boiler, so wall thickness reduction due to corrosion or the like is unlikely to occur. In this regard, in the configuration of (1) above, the operation part for performing the operation of pressing the tube against the positioning saddle by the pressing part is accessible from the positioning saddle side which is the reference for aligning the core of the tube and the processing machine. Therefore, with the positioning saddle located on the outer furnace side and the pressing part located on the inner furnace side respectively, the operation part can be operated from the outer furnace side (i.e., the positioning saddle side) to bring the tube into a state where it is pressed against the positioning saddle by the pressing part. Therefore, even when working from the outer furnace side, appropriate core alignment can be performed based on the outer furnace part of the tube, and thereby, the end of the tube can be appropriately processed.

[0054] (2) In some embodiments, in the configuration of (1) above, The operation part is configured to operate the pressing part and is located offset from the region (R1) including the processing machine, the positioning saddle, and the pressing part in the axial direction of the tube.

[0055] According to the configuration of (2) above, the operation part for operating the pressing part is located offset from the region including the processing machine, the positioning saddle, and the pressing part in the axial direction of the tube. Therefore, even when the pressing part is located on the inner furnace side, the access from the outer furnace side (i.e., the positioning saddle side) to the operation part is not inhibited by the processing machine, the positioning saddle, and the pressing part. For this reason, it is easy to appropriately operate the operation part from the outer furnace side with the positioning saddle located on the outer furnace side and the pressing part located on the inner furnace side respectively. Therefore, even when working from the outer furnace side, appropriate core alignment based on the outer furnace part of the tube becomes easier.

[0056] (3) In some embodiments, in the configuration of (2) above, The processing device is a first shaft (10) extending along the radial direction of the tube and provided with the pressing part on one end side, and A second shaft (12) that is connected to the first shaft via a power transmission mechanism (such as a bevel gear 11 or the like) and extends along the axial direction of the tube. Comprising The operation unit includes a handle (7) provided on the second shaft.

[0057] According to the configuration of (3) above, a handle for operating the pressing portion is provided on the second shaft that is connected to the first shaft to which the pressing portion is provided via a power transmission mechanism and extends along the axial direction of the tube. Therefore, in the axial direction of the tube, it is easy to position the handle (operation unit) at a position deviated from the region including the processing machine, the positioning saddle, and the pressing portion. For this reason, as described in (2) above, in a state where the positioning saddle is located outside the furnace and the pressing portion is located inside the furnace, it is easy to appropriately operate the operation unit from the outside of the furnace. Therefore, even when working from the outside of the furnace, it becomes easy to perform appropriate centering based on the outer portion of the tube outside the furnace.

[0058] (4) In some embodiments, in any of the configurations of (1) to (3) above, The processing machine includes a processing tool (24) for processing the end of the tube and a motor (34) for driving the processing tool. The rotation axis (O) of the processing tool extends along the axial direction of the tube. The motor has an output shaft (32) that extends in a direction intersecting the axial direction and is connected to the processing tool via a power transmission mechanism (such as a bevel gear 31 or the like).

[0059] According to the configuration of (4) above, since the extending direction of the output shaft of the motor for driving the processing tool is set to a direction along a direction intersecting the rotation axis of the processing tool, compared with the case where the processing tool is directly connected to the output shaft of the motor, it is easy to reduce the size of the processing device in the rotation axis direction of the processing tool (i.e., in the axial direction of the tube). Therefore, the length in the axial direction of the cutting region of the furnace wall required to provide an installation space for the processing device can be shortened. Therefore, the time required for repairing the furnace wall can be shortened.

[0060] (5) The tube processing method according to at least one embodiment of the present invention is a method of processing an end portion (51) of a tube using a processing apparatus (1) including the processing machine (20), a positioning saddle (4) for positioning the tube (50) with respect to the processing machine, and a pressing portion (6) for pressing the tube toward the positioning saddle, a positioning step of positioning the tube such that the tube to be processed is aligned along the positioning saddle and the tube and the processing machine are centered in the axial direction; an operation step of operating the pressing portion or the positioning saddle by an operation from the positioning saddle side to bring the tube into a state of being pressed against the positioning saddle by the pressing portion; a processing step of processing the end portion of the tube using the processing machine while the tube is pressed against the positioning saddle by the pressing portion; and is provided with.

[0061] In the method of (5) above, the operation of pressing the tube against the positioning saddle by the pressing portion is performed from the positioning saddle side which is a reference for centering the tube and the processing machine. Therefore, in a state where the positioning saddle is located outside the furnace and the pressing portion is located inside the furnace, by operating from the outside of the furnace (i.e., the positioning saddle side), the tube can be brought into a state of being pressed against the positioning saddle by the pressing portion. Therefore, even when working from the outside of the furnace, appropriate centering can be performed based on the outside portion of the tube outside the furnace, and thereby the end portion of the tube can be appropriately processed.

[0062] (6) In some embodiments, in the method of (5) above, the processing method includes a step of performing build-up welding on the end portion of the tube before the positioning step and includes.

[0063] When butt welding with another pipe is performed after beveling the pipe while a part of the end of the pipe to be processed is thinned, at the portion where the pipe thickness is thin, the shielding gas supplied during welding may be disturbed and outside air (air) may enter the welding location, resulting in welding defects. In this regard, in the method of (6) above, before aligning the processing machine and the pipe, build-up welding is performed on the end of the pipe, so that beveling of the pipe and subsequent butt welding can be performed with the pipe thickness increased. Therefore, welding defects that may occur when the pipe thickness is thin can be effectively suppressed.

[0064] (7) In some embodiments, in the method of (5) or (6) above, The processing step includes a beveling step of beveling the end of the pipe with the processing machine to which the tool (26) is attached.

[0065] According to the method of (7) above, the end of the pipe can be appropriately beveled with the processing machine to which the tool is attached.

[0066] (8) In some embodiments, in any of the methods of (5) to (7) above, The processing step includes a rib removing step of removing a rib (54) provided on the inner wall surface of the pipe at the end with the processing machine to which a drill (28) is attached.

[0067] According to the method of (8) above, the rib provided on the inner wall surface of the pipe can be appropriately removed with the processing machine to which the drill is attached. Therefore, compared with the case where the rib is removed by manual polishing, the processing time required for rib removal can be shortened. Also, compared with the case where the rib is removed by manual polishing, the inner peripheral surface of the end of the pipe after rib removal can be made closer to a perfect circle concentric with the outer peripheral surface of the pipe. Therefore, the accuracy of beveling can be improved, and the quality of butt welding of the pipe can be improved.

[0068] (9) In some embodiments, in the method of (7) above, The processing step is the above-mentioned groove machining step, a rib removing step of removing a rib provided on an inner wall surface of the pipe at the end portion with the processing machine to which a drill is attached, and includes, the processing method is, provided with a step of replacing the tool bit and the drill of the processing machine.

[0069] According to the method of (9) above, by replacing the tool bit and the drill in the processing machine, both rib removal and groove machining can be performed with the same processing machine. Therefore, the processing time can be effectively shortened.

[0070] (10) In some embodiments, in any of the methods of (5) to (9) above, the pipe to be processed is a repair target pipe (62A) having a cut end portion with a part of a plurality of furnace wall pipes (62) constituting a furnace wall (61) cut off, with the positioning saddle located outside the furnace of the furnace wall and the pressing portion located inside the furnace of the furnace wall, the positioning step, the operation step, and the processing step are performed.

[0071] According to the method of (10) above, with the positioning saddle located outside the furnace and the pressing portion located inside the furnace respectively, by operating from the outside of the furnace (i.e., the positioning saddle side), the furnace wall pipe to be processed can be pressed against the positioning saddle by the pressing portion. Therefore, even when working from the outside of the furnace, appropriate centering can be performed based on the outside portion of the furnace wall pipe, and thereby, the cut end portion of the furnace wall pipe can be appropriately processed.

[0072] (11) In some embodiments, in the method of (10) above, the pipe thickness of the inner furnace side portion of the repair target pipe is smaller than the pipe thickness of the outer furnace side portion of the repair target pipe.

[0073] In the method of (11) above, as described in (5) above, since the positioning saddle that serves as the reference for aligning the core between the pipe and the processing machine is located outside the furnace, for example, even when the pipe thickness of the inner furnace part of the pipe is reduced due to corrosion or the like and is thinner than the outer furnace part, appropriate alignment can be performed with reference to the outer furnace part of the pipe. Therefore, the end of the pipe can be processed appropriately.

[0074] (12) In some embodiments, in the method of (10) above, The pipe thickness of the inner furnace part of the pipe to be repaired is greater than the pipe thickness of the outer furnace part of the pipe to be repaired.

[0075] In the method of (12) above, as described in (5) above, since the positioning saddle that serves as the reference for aligning the core between the pipe and the processing machine is located outside the furnace, for example, even when the pipe thickness of the inner furnace part of the pipe is thicker than the outer furnace part due to build-up for corrosion prevention or the like, appropriate alignment can be performed with reference to the outer furnace part of the pipe. Therefore, the end of the pipe can be processed appropriately.

[0076] As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and also includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.

[0077] In this specification, expressions representing relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric", or "coaxial" not only strictly represent such arrangements, but also represent a state of being relatively displaced with tolerances or at an angle or distance such that the same function can be obtained. For example, expressions representing that things such as "identical", "equal", and "homogeneous" are in an equal state not only strictly represent an equal state, but also represent a state in which there are tolerances or differences such that the same function can be obtained. In addition, in this specification, expressions representing shapes such as a square shape or a cylindrical shape not only represent the shapes such as a square shape or a cylindrical shape in a geometrically strict sense, but also represent shapes including concave and convex portions, chamfered portions, etc. within a range where the same effect can be obtained. In addition, in this specification, expressions such as "comprises", "includes", or "has" for one component are not exclusive expressions that exclude the existence of other components.

Explanation of Reference Numerals

[0078] 1 Processing device 2 Main body part 2A Protrusion 4 Positioning saddle 6 Pressing part 7 Handle 8 Operating part 9 Thread hole 10 First shaft 11 Bevel gear 12 Second shaft 14 Support part 16 Holding part 20 Processing machine 22 Tool holder 23 Rotating shaft 24 Tool 26 Tool bit 27 Gear 28 Drill 29 Gear 30 Shaft 31 Bevel gear 32 Output shaft 34 Motor 36 Casing 38 Position adjustment handle 50 Pipe 51 End 52 Build-up part 54 Rib 61 Furnace wall 62 Furnace wall pipe 62A Pipe to be repaired 64 Fin 66 Pipe replacement range 68 Fin cutting part 70 Marking 72 Cutting end 74 Gap 76 Opening hole 77 New pipe 78 End 79 Weld part 82 Fin part 84 Weld part 100 Repair part 102 Pipe repair area 104 Fin cutting area O Rotation axis Q Central axis

Claims

1. A processing machine for processing the end of a pipe, A positioning saddle for positioning the pipe so as to align the pipe with the processing machine, A pressing portion provided on the opposite side of the positioning saddle across the pipe, for pressing the pipe toward the positioning saddle, An operation portion for manually or using a tool to operate the pressing portion or the positioning saddle so that the pipe is pressed against the positioning saddle by the pressing portion, Comprising, The operation portion is located offset from the region including the processing machine, the positioning saddle, and the pressing portion in the axial direction of the pipe, and is configured to be accessible from the positioning saddle side A pipe processing apparatus.

2. The operation portion is configured to operate the pressing portion The pipe processing apparatus according to Claim 1.

3. A first shaft extending along the radial direction of the pipe, with the pressing portion provided at one end side, A second shaft connected to the first shaft via a power transmission mechanism and extending along the axial direction of the pipe, Comprising, The operation portion includes a handle provided on the second shaft The pipe processing apparatus according to Claim 2.

4. The processing machine includes a processing tool for processing the end of the pipe and a motor for driving the processing tool, The rotation axis of the processing tool extends along the axial direction of the pipe, The motor extends in a direction intersecting the axial direction and has an output shaft connected to the processing tool via a power transmission mechanism The pipe processing apparatus according to any one of Claims 1 to 3.

5. A method for processing the end of a pipe using a processing apparatus including a processing machine, a positioning saddle for positioning the pipe with respect to the processing machine, a pressing portion for pressing the pipe toward the positioning saddle, and an operation portion located offset from the region including the processing machine, the positioning saddle, and the pressing portion in the axial direction of the pipe, comprising: A positioning step of positioning the pipe by aligning the pipe with the processing machine along the positioning saddle for the pipe to be processed, An operation step of operating the pressing portion or the positioning saddle using the operation portion by an operation from the positioning saddle side so that the pipe is pressed against the positioning saddle by the pressing portion, A processing step of processing the end of the pipe using the processing machine with the pipe pressed against the positioning saddle by the pressing portion A method for processing a pipe provided with

6. The method for processing a pipe according to claim 5, including a step of overlay welding on the end of the pipe before the positioning step The method for processing a pipe according to claim 5, including a step of overlay welding on the end of the pipe before the positioning step

7. The processing step includes a chamfering step of chamfering the end of the pipe with the processing machine to which a cutting tool is attached The method for processing a pipe according to claim 5 or 6

8. The processing step includes a rib removing step of removing a rib provided on the inner wall surface of the pipe at the end with the processing machine to which a drill is attached The method for processing a pipe according to any one of claims 5 to 7

9. The processing step includes the chamfering step, and a rib removing step of removing a rib provided on the inner wall surface of the pipe at the end with the processing machine to which a drill is attached, and includes a step of replacing the cutting tool and the drill of the processing machine The method for processing a pipe according to claim 7

10. The pipe to be processed is a pipe to be repaired having a cut end with a part of a plurality of furnace wall pipes constituting a furnace wall cut off, and the positioning step, the operation step, and the processing step are performed in a state where the positioning saddle is located outside the furnace of the furnace wall and the pressing portion is located inside the furnace of the furnace wall The method for processing a pipe according to any one of claims 5 to 9

11. The wall thickness of the inner furnace part of the pipe to be repaired is smaller than the wall thickness of the outer furnace part of the pipe to be repaired The method for processing a pipe according to claim 10

12. The wall thickness of the inner furnace part of the pipe to be repaired is larger than the wall thickness of the outer furnace part of the pipe to be repaired The method for processing a pipe according to claim 10 ​ ​

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