JP7709897B2 - Tube processing device and tube processing method - Google Patents

Description

This disclosure relates to a tube processing device and a tube processing method.

When butt welding the ends of pipes together, groove preparation is performed to form a groove at the end of the pipe.

Patent Document 1 discloses a groove processing device that includes a centering adjustment bed on which the pipe to be processed is placed, and a pipe holder that is provided on the opposite side of the centering adjustment bed with the pipe in between. In this groove processing device, the centering between the rotating shaft of the groove processing machine and the pipe is performed by pressing and fixing the pipe from the outside with the centering adjustment bed and the pipe holder.

JP 2002-79402 A

It has been proposed to carry out repair work on furnace wall tubes of boilers and the like from outside the furnace. By working from the outside of the furnace, there is no need to set up scaffolding inside the furnace, making it possible to reduce the number of labor hours required for repair work compared to working from the inside of the furnace.

On the other hand, when working from outside the furnace, in conventional processing equipment such as that described in Patent Document 1, due to the configuration of the equipment, the processing equipment and the tube are aligned based on the part of the tube inside the furnace to be processed. Here, the part of the tube inside the furnace is exposed to high-temperature combustion gas when the boiler is operating, and it may be thinned due to corrosion, especially in boilers that have been operated for a long time. In such a case, if the center is aligned based on the part of the tube inside the furnace, the center of the processing equipment and the tube will be misaligned, making it difficult to perform appropriate groove processing. If the remaining tube (existing pipe) and the new pipe are misaligned, a step will be created, and in particular, if the inner surfaces of the tubes are misaligned (misaligned), defects are more likely to occur during welding.

In view of the above, at least one embodiment of the present invention aims to provide a tube processing device and a tube processing method that facilitates alignment of the tube to be processed with the processing device.

At least one embodiment of the present invention relates to a tube processing device,
a processing machine for processing the end of the tube;
a positioning saddle for positioning the tube so as to align the tube with the processing machine;
a pressing portion provided on the opposite side of the positioning saddle across the tube, the pressing portion pressing the tube against the positioning saddle;
an operating unit for operating the pressing unit or the positioning saddle manually or by using a tool so that the tube is pressed against the positioning saddle by the pressing unit;
Equipped with
The operating unit is configured to be accessible from the positioning saddle side.

In addition, a method for processing a tube according to at least one embodiment of the present invention includes the steps of:
A method for processing an end of a tube using a processing device including a processing machine, a positioning saddle for positioning the tube relative to the processing machine, and a pressing portion for pressing the tube against the positioning saddle, comprising:
a positioning step of aligning the pipe to be processed along the positioning saddle and positioning the pipe so as to align the processing machine with the pipe in the axial direction;
an operating step of operating the holding portion or the positioning saddle by operating from the positioning saddle side to make the tube pressed against the positioning saddle by the holding portion;
a processing step of processing an end portion of the tube using the processing machine while the tube is pressed against the positioning saddle by the pressing portion;
Equipped with.

At least one embodiment of the present invention provides a tube processing device and a tube processing method that facilitates alignment between the tube to be processed and the processing device.

1 is a schematic diagram of a tube processing device according to one embodiment; 2 is a cross-sectional view taken along line AA of FIG. 1. FIG. 2 is a cross-sectional view of a typical processing apparatus taken along line AA in FIG. 2 is a cross-sectional view of the processing device according to the embodiment, taken along line AA in FIG. 1. FIG. 2 is an enlarged view showing a part of a processing tool of the processing device according to the embodiment; This is a cross section taken along line BB in FIG. This is a cross section taken along line BB in FIG. 1 is a flowchart of a furnace wall tube repair method including a tube processing method according to an embodiment. 1 is a schematic diagram of a furnace wall showing a process of a furnace wall tube repair method including a tube processing method according to an embodiment. FIG. 1 is a schematic diagram of a furnace wall showing a process of a furnace wall tube repair method including a tube processing method according to an embodiment. FIG. 1 is a schematic diagram of a furnace wall showing a process of a furnace wall tube repair method including a tube processing method according to an embodiment. FIG. 1 is a schematic diagram of a furnace wall showing a process of a furnace wall tube repair method including a tube processing method according to an embodiment. FIG.

Below, several embodiments of the present invention will be described with reference to the attached drawings. However, the dimensions, materials, shapes, relative positions, etc. of the components described as the embodiments or shown in the drawings are not intended to limit the scope of the present invention and are merely illustrative examples.

(Configuration of processing device)
Fig. 1 is a schematic diagram of a tube processing device according to one embodiment. Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1. The processing device 1 shown in Fig. 1 is a device 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 a furnace wall of a boiler (such as a coal-fired boiler or a soda recovery boiler).

As shown in FIG. 1, the processing device 1 includes a processing machine 20, a positioning saddle 4, a pressing unit 6, and an operating unit 8.

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

The tool holder 22 and the 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 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 and 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 manner, the tool holder 22 and the tool 24 are rotationally driven by the motor 34. In FIG. 1, the motor 34 is housed in a motor casing 36.
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 link mechanism, or the like.

The axial positions of the tool holder 22 and tool 24 can be adjusted using the position adjustment handle 38.

The processing tool 24 shown in FIG. 1 is a cutting tool 26 for cutting the end of a pipe 50. By rotating the cutting tool 26 around the rotation axis O by the motor 34 while adjusting the position of the cutting tool 26 in the axial direction by operating the position adjustment handle 38, a groove for butt welding can be formed in the end of the pipe 50.

The positioning saddle 4 is for positioning the tube 50 so as to align the processing machine 20 with the tube 50 to be processed. As shown in FIG. 1, the positioning saddle 4 is attached to the protruding portion 2A of the main body 2, which protrudes toward the central axis O of the processing machine 20 in a direction perpendicular to the central axis O. 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 tube 50 at two or more points when viewed in the axial direction. This allows the tube 50 to be positioned relative to the positioning saddle 4. The shape and position of the positioning saddle 4 are set according to the outer diameter of the tube 50 to be processed so that the central axis Q of the tube 50 coincides with the central axis O of the processing machine.

The positioning saddle 4 shown in FIG. 2 has a Y-shaped cross section perpendicular 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-shaped shape that corresponds to the outer surface of the tube 50 to be processed.

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

The operating unit 8 is used to operate the holding unit 6 or the positioning saddle 4 manually or with a tool (such as a wrench) so that the holding unit 6 presses the tube 50 against the positioning saddle 4.

1 includes a handle 7 for operating the presser 6. The handle 7 is provided at one end of a second shaft 12 extending along the axial direction of the tube 50 (or the axial direction of the processing machine 20). The second shaft 12 is supported by the main body 2 via a support 14. A power transmission mechanism is provided between the second shaft 12 and the first shaft 10, and 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. Thus, by rotating the handle 7, the first shaft 10 can be screwed into the screw hole 9.
In the illustrated embodiment, the power transmission mechanism mentioned above includes a bevel gear 11. In some embodiments, the power transmission mechanism mentioned above may include a flexible shaft or linkage.

Although not specifically shown, in some embodiments, the operating portion 8 may be used to operate the positioning saddle 4 so that the tube 50 is pressed against the positioning saddle 4 by the pressing portion 6.

A handle 16 is provided on the positioning saddle 4 side of the main body 2 of the processing machine 20, allowing an operator to grasp the handle 16 and perform various tasks.

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 in a position accessible to an operator on the positioning saddle 4 side of the processing device 1.

For example, in the exemplary embodiment shown in FIG. 1, the operating unit 8 is positioned offset from the region R1 including the processing machine 20, the positioning saddle 4, and the holding unit 6 in the axial direction of the pipe 50 (or the axial direction of the processing machine 20). Therefore, an operator on the positioning saddle 4 side of the processing device 1 can access the operating unit 8 (handle 7) without being obstructed by the processing machine 20, the positioning saddle 4, and the holding unit 6.

When performing work such as repairing furnace walls from outside the furnace, conventional processing equipment requires that the inside of the furnace part of the tube to be processed be used as a reference point to align the processing equipment with the tube, due to the configuration of the equipment. Here, the inside of the furnace part of the tube is exposed to high-temperature combustion gas during boiler operation, and may become thin due to corrosion, etc. In this case, if the center is aligned based on the inside of the furnace part of the tube 50 that has become thin, as shown in Figure 3, for example, the center axis O of the processing machine and the center axis Q of the tube will be misaligned, making it difficult to perform appropriate groove processing.

Figure 3 is a view of a typical processing device, corresponding to the A-A cross section of Figure 1. In Figure 3, the positioning saddle 4' is located inside the furnace, and the holding part 6' is located outside the furnace. Also, the dashed line 50' indicates the position of the outer surface of the tube 50 before it is thinned.

On the other hand, unlike the furnace inner part of the furnace wall tube, the furnace outer part of the boiler is not directly exposed to high-temperature combustion gas during boiler operation, so that thinning due to corrosion and the like is unlikely to occur. In this regard, in the configuration according to the above-mentioned embodiment, the operating part 8 for pressing the tube 50 (furnace wall tube, etc.) against the positioning saddle 4 by the pressing part 6 is accessible from the positioning saddle 4 side, which is the reference for aligning the tube 50 and the processing machine 20. Therefore, with the positioning saddle 4 positioned outside the furnace and the pressing part 6 positioned inside the furnace, the operating part 8 can be operated from the furnace outer side (i.e., the positioning saddle 4 side) to press the tube 50 against the positioning saddle 4 by the pressing part 6. Therefore, even when working from outside the furnace, as shown in FIG. 2, appropriate alignment can be performed based on the furnace outer part of the tube 50 (i.e., the position of the central axis O of the processing machine 20 and the central axis Q of the tube 50 can be aligned), and the end 51 of the tube 50 can be appropriately processed.

In addition, new pipes that have not been thinned due to corrosion or other reasons have the center of the outer diameter aligned with the center of the inner diameter. Therefore, when such new pipes are to be processed, the pipe can be properly aligned with the processing machine regardless of whether the part of the pipe outside the furnace or the part inside the furnace is used as the reference.

Figure 4 is a view of the processing device according to one embodiment, corresponding to the A-A cross section in Figure 1. In Figure 4, the pipe 50 to be processed is a pipe with a build-up portion 52 for corrosion protection provided on the inside of the furnace. In the processing device 1 according to the above-mentioned embodiment, proper centering can be performed based on the outside of the furnace of the pipe 50, so that proper centering can be performed even if the inside of the furnace of the pipe 50 is thicker than the outside of the furnace, as shown in Figure 4.

In the exemplary embodiment shown in FIG. 1, the rotation axis O of the processing tool 24 extends along the axial direction of the pipe 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 pipe 50 (or the axial direction of the processing machine 20). As described above, the output shaft 32 and the processing tool 24 are connected to each other via a power transmission mechanism (such as a bevel gear 31).

According to the above-mentioned configuration, the extension direction of the output shaft 32 of the motor 34 for driving the processing tool 24 is a direction that intersects with the rotation axis O of the processing tool 24, so it is easier to reduce the size of the processing device 1 in the direction of the rotation axis of the processing tool 24 (i.e., in the axial direction of the tube 50) compared to when the processing tool 24 is directly connected to the output shaft 32 of the motor 34. Therefore, the axial length of the cutting area of the furnace wall required to provide installation space for the processing device 1 can be shortened. Therefore, the time required to repair the furnace wall can be shortened.

Figure 5 is an enlarged view of the processing tool 24 of the processing device 1 according to one embodiment. Figures 6 and 7 are cross-sectional views taken along the line B-B in Figure 5. In some embodiments, the processing device 1 is configured to be able to replace the processing tool 24 of the processing machine 20. For example, in the processing device 1 shown in Figure 1, the cutting tool 26 (processing tool 24) of the processing machine 20 may be able to be replaced with the drill 28 shown in Figure 5.

5 and 6, when a rib 54 is provided on the inner surface of a tube 50 such as a furnace wall tube, the accuracy of the bevel processing can be improved by removing the rib 54 on the end 51 of the tube 50 before bevel processing of the tube 50. Therefore, by attaching a drill 28 to the processing tool holder 22 of the processing device 1 and rotating the drill 28 around the rotation axis O, as shown in FIG.
The rib at end 51 of 0 can be cut away and removed.

In this way, by using the processing device 1 equipped with the drill 28, the time required to remove the ribs can be reduced compared to removing the ribs by manual grinding. Also, in the above-described embodiment, by replacing the processing tool 24, both rib removal and groove preparation can be performed by a single processing device 1. Therefore, the time required to process the end of the pipe 50 can be more effectively reduced.

(Processing method/repair method flow)
Hereinafter, a method for repairing a furnace wall tube including a tube processing method according to one embodiment will be described. Fig. 8 is a flow chart of a method for repairing a furnace wall tube including a tube processing method according to one embodiment. Figs. 9 to 12 are schematic diagrams of a furnace wall showing the process of a method for repairing a furnace wall tube including a tube processing method according to one embodiment.

In one embodiment, first, prior to step S2 shown in FIG. 8, among the multiple furnace wall tubes 62 that make up the furnace wall 61, a repair target tube 62A (a tube 50 to be processed) and a tube replacement range 66 of the repair target tube 62A are determined based on locations where damage such as thinning or cracks have occurred (see FIG. 9). The tube replacement range 66 is a portion that will be replaced with a new tube by a procedure that will be described later. There is no limit to the number of repair target tubes 62A to be repaired in one operation.

As shown in FIG. 9, markings 70 (shown by dashed lines in FIG. 9) may be applied to indicate the tube replacement area 66 and the fin removal area 68.

Next, the tube replacement range 66 of the tube 62A to be repaired determined by the above-mentioned procedure, and the fin cut-off portion 68 of the fin 64 connected to the tube 62A to be repaired, which extends over a wider area than the tube replacement range 66 in the longitudinal direction of the furnace wall tube 62, are cut and removed using any cutting device (step S2).

When the tube replacement area 66 and the fin cut-out portion 68 are cut off from the repair target tube 62A and the fin 64 in step S2, as shown in FIG. 10, an opening hole 76 is formed in the furnace wall 61 that connects the outside of the boiler (one of the two sides of the furnace wall 61) and the inside of the furnace (the other of the two sides of the furnace wall 61). In addition, a pair of cut ends 72, 72 are formed at the cut location of the tube replacement area 66 of each repair target tube 62A, and a gap 74 is formed between each repair target tube 62A and the furnace wall tube 62 adjacent to the repair target tube 62A (which may be another repair target tube 62A). The gap 74 is formed at a position corresponding to the fin cut-out portion 68 cut off in step S2, and extends over a wider range in the longitudinal direction of the furnace wall tube 62 than the range between the pair of cut ends 72, 72.

Next, the above-mentioned processing device 1 is used to remove the ribs provided on the inner surface of the end including the cut end 72 of the pipe 62A (pipe 50) to be repaired (step S4; see Figures 6 and 7). In step S4, the pipe 62A to be repaired is aligned with the positioning saddle 4 of the processing device 1, and the pipe 62A to be repaired is positioned so that the processing machine 20 and the pipe 62A to be repaired are aligned in the axial direction. Then, the handle 7 (operation unit 8) is operated from the outside of the furnace (positioning saddle side) to press the pipe 62A to the positioning saddle 4 by the pressing unit 6. The drill 28 (see Figure 5) is attached to the processing 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 unit 6, the drill 28 is driven to cut and remove the ribs at the end of the pipe 62A to be repaired.

Next, the above-mentioned processing device 1 is used to perform bevel preparation on the end of the pipe 62A (pipe 50) to be repaired, including the cut end 72 (step S6). In step S6, the drill 28 is removed from the processing tool holder 22 of the processing device 1, and the tool holder 22 is fitted with the tool 26 (see FIG. 1) for bevel preparation. Then, with the pipe 62A to be repaired pressed against the positioning saddle 4 by the pressure unit 6, the tool 26 is driven to perform bevel preparation on the end of the pipe 62A to be repaired.

If the end of the pipe 62A to be repaired is thin, build-up welding may be performed on the end of the pipe 62A to be repaired before steps S4 and S6 are performed. Here, for example, build-up welding may be performed around the end of the pipe 62A to be repaired using a welding machine capable of welding along the circumferential direction of the pipe 62A to be repaired.

If the end of the pipe to be repaired is partially thinned, and the pipe is butt-welded to another pipe after groove preparation, the shielding gas supplied during welding may become disturbed in the thinner pipe, allowing outside air (air) to enter the welded area, resulting in a weld defect. In this regard, as described above, by overlay welding the end of the pipe to be repaired 62A before aligning the processing machine with the pipe to be repaired 62A, the pipe thickness can be increased, and the groove preparation and subsequent butt welding of the pipe to be repaired 62A in step S6 can be performed. This makes it possible to effectively suppress welding defects that may occur when the pipe thickness is thin.

Next, the new pipe 77 is placed so that both ends 78, 78 (see FIG. 11) of the new pipe 77 face the pair of cut ends 72, 72 of the pipe to be repaired 62A, and the new pipe 77 is aligned so that the central axis of the pipe to be repaired 62A overlaps with the central axis of the new pipe 77, and the cut end 72 of the pipe to be repaired 62A is connected to the new pipe 77 by welding (step S8). The alignment and welding of the pipe to be repaired 62A and the new pipe 77 can be performed, for example, using a device described in JP 2021-107747 A.

As shown in FIG. 11, when step S8 is completed, the repaired portion 100 of the furnace wall 61 includes a pipe repair area 102 in which a new pipe 77 is connected to the cut end 72 of the pipe 62A to be repaired via a welded portion 79 formed by welding in step S8, and a fin cut-out area 104 in which the fin 64 has been cut off at a position corresponding to the fin cut-out portion 68 (see FIG. 9).

Next, the fin portion 82 (see FIG. 12) corresponding to the fin cut portion 68 is fitted into the fin cut area 104 and welded to close the fin cut area 104. At this time, as shown in FIG. 12, the fin portion 82 is welded to adjacent fins 64 in the longitudinal direction of the furnace wall tube 62, and is also welded to the furnace wall tube 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 of the furnace wall tube 62 (direction perpendicular to the longitudinal direction). This forms a welded portion 84 along the outer edge of the fin portion 82.

The method described above allows repair work on the furnace wall tube 62 (including groove preparation of the repair target tube 62A using the processing device 1) to be performed outside the furnace.

The contents described in each of the above embodiments can be understood, for example, as follows:

(1) At least one embodiment of the present invention relates to a tube processing device (1),
A processing machine (20) for processing an end (51) of a tube (50);
a positioning saddle (4) for positioning the tube so as to align the tube with the processing machine;
A pressing portion (6) is provided on the opposite side of the positioning saddle across the tube, and presses the tube against the positioning saddle;
An operating unit (8) for operating the pressing unit or the positioning saddle manually or with a tool so that the pressing unit presses the tube against the positioning saddle;
Equipped with
The operating unit is configured to be accessible from the positioning saddle side.

Unlike the inner furnace part of the furnace wall tube, the outer furnace part of the boiler is not directly exposed to high-temperature combustion gas during boiler operation, and is therefore less susceptible to thinning due to corrosion, etc. In this regard, in the configuration of (1) above, the operating part for pressing the tube against the positioning saddle with the pressing part is accessible from the positioning saddle side, which serves as the reference for aligning the tube with the processing machine. Therefore, with the positioning saddle positioned outside the furnace and the pressing part positioned inside the furnace, the operating part can be operated from the outside of the furnace (i.e., the positioning saddle side) to press the tube against the positioning saddle with the pressing part. Therefore, even when working from outside the furnace, proper alignment can be performed based on the outer furnace part of the tube, and the end of the tube can be properly processed.

(2) In some embodiments, in the configuration of (1),
The operating portion is configured to operate the holding portion, and is positioned offset in the axial direction of the tube from a region (R1) including the processing machine, the positioning saddle, and the holding portion.

According to the above configuration (2), the operating part for operating the pressing part is positioned offset in the axial direction of the tube from the area including the processing machine, the positioning saddle, and the pressing part. Therefore, even when the pressing part is positioned inside the furnace, the processing machine, the positioning saddle, and the pressing part do not obstruct access to the operating part from outside the furnace (i.e., the positioning saddle side). For this reason, with the positioning saddle positioned outside the furnace and the pressing part positioned inside the furnace, it is easy to properly operate the operating part from outside the furnace. Therefore, even when working from outside the furnace, it is easy to properly align the center of the tube based on the outside of the furnace part.

(3) In some embodiments, in the configuration of (2),
The processing device includes:
A first shaft (10) extending along the radial direction of the pipe and having the pressing portion provided on one end side;
A second shaft (12) connected to the first shaft via a power transmission mechanism (e.g., a bevel gear 11, etc.) and extending along the axial direction of the pipe;
Equipped with
The operating portion includes a handle (7) provided on the second shaft.

According to the configuration of (3) above, a handle for operating the pressing part is provided on a second shaft that is connected via a power transmission mechanism to the first shaft on which the pressing part is provided and extends along the axial direction of the tube, so that the handle (operating part) can be easily positioned in the axial direction of the tube at a position offset from the area including the processing machine, positioning saddle, and pressing part. For this reason, as described in (2) above, with the positioning saddle positioned outside the furnace and the pressing part positioned inside the furnace, it is easy to properly operate the operating part from outside the furnace. Therefore, even when working from outside the furnace, it is easy to properly align the center of the tube based on the outside part of the furnace.

(4) In some embodiments, in any one of the configurations (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) extending in a direction intersecting the axial direction and connected to the processing tool via a power transmission mechanism (e.g., a bevel gear 31, etc.).

According to the above configuration (4), the extension direction of the output shaft of the motor for driving the processing tool is set to a direction intersecting the rotation axis of the processing tool, so it is easier to reduce the size of the processing device in the direction of the rotation axis of the processing tool (i.e., in the axial direction of the tube) compared to when the processing tool is directly connected to the output shaft of the motor. Therefore, the axial length of the cutting area of the furnace wall required to provide installation space for the processing device can be shortened. This makes it possible to shorten the time required to repair the furnace wall.

(5) At least one embodiment of the present invention relates to a method for processing a tube,
A method for processing an end portion (51) of a tube using a processing device (1) including the processing machine (20), a positioning saddle (4) for positioning the tube (50) relative to the processing machine, and a pressing portion (6) for pressing the tube against the positioning saddle, comprising:
a positioning step of aligning the pipe to be processed along the positioning saddle and positioning the pipe so as to align the processing machine with the pipe in the axial direction;
an operating step of operating the holding portion or the positioning saddle by operating from the positioning saddle side to make the tube pressed against the positioning saddle by the holding portion;
a processing step of processing an end portion of the tube using the processing machine while the tube is pressed against the positioning saddle by the pressing portion;
Equipped with.

In the above method (5), the operation of pressing the tube against the positioning saddle with the pressing part is performed from the positioning saddle side, which serves as the reference for aligning the tube with the processing machine. Therefore, with the positioning saddle positioned outside the furnace and the pressing part positioned inside the furnace, the tube can be pressed against the positioning saddle by the pressing part by operating from outside the furnace (i.e., the positioning saddle side). Therefore, even when working from outside the furnace, proper alignment can be performed based on the outside-furnace part of the tube, and the end of the tube can be properly processed.

(6) In some embodiments, in the method of (5),
The processing method includes:
The method includes the step of overlaying the end of the tube prior to the positioning step.

If the end of the pipe to be processed is partially thinned, and the pipe is butt-welded to another pipe after groove preparation, the shielding gas supplied during welding may become disturbed in the thinner pipe, allowing outside air (air) to enter the welded area, resulting in a weld defect. In this regard, in the method (6) above, build-up welding is performed on the end of the pipe before aligning the processing machine with the pipe, so that the pipe can be grooved and then butt-welded with a thicker pipe thickness. This effectively prevents welding defects that can occur when the pipe is thinner.

(7) In some embodiments, in the method of (5) or (6),
The processing step includes a bevel processing step of performing bevel processing on the end portion of the pipe using the processing machine to which a cutting tool (26) is attached.

According to the method (7) above, the end of the pipe can be properly beveled using a processing machine equipped with a cutting tool.

(8) In some embodiments, in any of the methods (5) to (7) above,
The machining step includes a rib removing step of removing ribs (54) provided on the inner wall surface of the tube at the end portion by using the machining machine equipped with a drill (28).

According to the method (8) above, the ribs on the inner wall surface of the pipe can be properly removed using a processing machine equipped with a drill. Therefore, the processing time required for removing the ribs can be shortened compared to removing the ribs by manual grinding. Also, compared to removing the ribs by manual grinding, the inner peripheral surface of the end of the pipe after the ribs are removed can be made closer to a perfect circle concentric with the outer peripheral surface of the pipe. Therefore, the accuracy of the groove preparation can be improved, and the quality of the pipe butt welding can be improved.

(9) In some embodiments, in the method of (7),
The processing step includes the groove processing step and
a rib removing step of removing ribs provided on the inner wall surface of the pipe at the end portion by the processing machine equipped with a drill;
The processing method includes:
The method further includes a step of replacing the bit and the drill of the processing machine.

According to the method (9) above, by replacing the bit and drill on the processing machine, both rib removal and groove preparation can be performed on the same processing machine. This effectively reduces the processing time.

(10) In some embodiments, in any of the methods (5) to (9) above,
The pipe to be processed is a pipe to be repaired (62A) among a plurality of furnace wall pipes (62) constituting a furnace wall (61), the pipe being partially cut off and having a cut end portion,
The positioning step, the operating step, and the processing step are performed in a state where the positioning saddle is positioned on the outer side of the furnace wall and the pressing portion is positioned on the inner side of the furnace wall.

According to the method (10) above, with the positioning saddle positioned outside the furnace and the pressing part positioned inside the furnace, the furnace wall tube to be processed can be pressed against the positioning saddle by the pressing part by operating from the outside of the furnace (i.e., the positioning saddle side). Therefore, even when working from outside the furnace, proper centering can be performed based on the outside part of the furnace wall tube, and the cut end of the furnace wall tube can be properly processed.

(11) In some embodiments, in the method of (10),
The pipe thickness of the inner-furnace portion of the pipe to be repaired is smaller than the pipe thickness of the outer-furnace portion of the pipe to be repaired.

In the method (11) above, as described in (5) above, the positioning saddle that serves as the reference for aligning the tube with the processing machine is located outside the furnace, so even if the tube thickness inside the furnace has been reduced due to corrosion or the like and is thinner than the part outside the furnace, proper alignment can be achieved using the part outside the furnace as the reference. This allows the end of the tube to be properly processed.

(12) In some embodiments, in the method of (10),
The pipe thickness of the inner-furnace portion of the pipe to be repaired is greater than the pipe thickness of the outer-furnace portion of the pipe to be repaired.

In the method (12) above, as described in (5) above, the positioning saddle that serves as the reference for aligning the tube with the processing machine is located on the outside of the furnace, so that even if the thickness of the tube inside the furnace is thicker than the part outside the furnace due to buildup for corrosion prevention, for example, it is possible to perform proper centering based on the part outside the furnace. Therefore, the end of the tube can be properly processed.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and also includes variations on the above-described embodiments and appropriate combinations of these embodiments.

In this specification, expressions expressing relative or absolute configuration, such as "in a certain direction,""along a certain direction,""parallel,""orthogonal,""center,""concentric," or "coaxial," do not only strictly represent such a configuration, but also represent a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained.
For example, expressions indicating that things are in an equal state, such as "identical,""equal," and "homogeneous," not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained.
Furthermore, in this specification, expressions describing shapes such as a rectangular shape or a cylindrical shape do not only refer to shapes such as a rectangular shape or a cylindrical shape in the strict geometric sense, but also refer to shapes that include uneven portions, chamfered portions, etc., to the extent that the same effect is obtained.
In addition, in this specification, the expressions "comprise,""include," or "have" a certain element are not exclusive expressions that exclude the presence of other elements.

1 Processing device 2 Main body 2A Protruding portion 4 Positioning saddle 6 Holding portion 7 Handle 8 Operation portion 9 Screw hole 10 First shaft 11 Bevel gear 12 Second shaft 14 Support portion 16 Handle portion 20 Processing machine 22 Processing tool holder 23 Rotating shaft 24 Processing tool 26 Bit 27 Gear 28 Drill 29 Gear 30 Shaft 31 Bevel gear 32 Output shaft 34 Motor 36 Casing 38 Position adjustment handle 50 Tube 51 End 52 Overlay portion 54 Rib 61 Furnace wall 62 Furnace wall tube 62A Repair target tube 64 Fin 66 Tube replacement range 68 Fin cut portion 70 Marking 72 Cut end 74 Gap 76 Opening hole 77 New tube 78 End 79 Welded portion 82 Fin portion 84 Welded portion 100 Repaired portion 102 Tube repair area 104 Fin removal area O Rotation axis Q Central axis

Claims (12)

a processing machine for processing the end of the tube;
a positioning saddle for positioning the tube so as to align the processing machine with the tube;
a pressing portion provided on the opposite side of the positioning saddle across the tube, the pressing portion pressing the tube against the positioning saddle;
an operating unit for operating the pressing unit or the positioning saddle manually or by using a tool so that the tube is pressed against the positioning saddle by the pressing unit;
Equipped with
The operating unit is positioned offset from an area including the processing machine, the positioning saddle and the pressing unit in the axial direction of the tube, and is configured to be accessible from the positioning saddle side. The operating portion is configured to operate the pressing portion.
2. The tube processing apparatus according to claim 1. A first shaft extending along a radial direction of the pipe and having the pressing portion provided on one end side thereof;
a second shaft connected to the first shaft via a power transmission mechanism and extending along the axial direction of the pipe;
Equipped with
The tube processing device according to claim 2 , wherein the operation portion includes a handle provided on the second shaft. The processing machine includes a processing tool for processing the end of the tube, and a motor for driving the processing tool;
The rotation axis of the processing tool extends along the axial direction of the tube,
The tube processing device according to claim 1 , wherein the motor has an output shaft extending in a direction intersecting the axial direction and connected to the processing tool via a power transmission mechanism. A method for processing an end of a tube using a processing device including a processing machine, a positioning saddle for positioning the tube relative to the processing machine, a pressing portion for pressing the tube against the positioning saddle, and an operating portion positioned offset from an area including the processing machine, the positioning saddle, and the pressing portion in an axial direction of the tube, comprising:
a positioning step of aligning the pipe to be processed along the positioning saddle and positioning the pipe so as to align the processing machine with the pipe;
an operation step of operating the holding portion or the positioning saddle using the operating portion by operating from the positioning saddle side to bring the tube into a state where the holding portion is pressed against the positioning saddle;
a processing step of processing an end portion of the tube using the processing machine while the tube is pressed against the positioning saddle by the pressing portion;
A pipe processing method comprising the steps of: 6. The method of claim 5, further comprising the step of overlaying said end of said tube prior to said positioning step. 7. The pipe processing method according to claim 5, wherein the processing step includes a groove processing step of performing groove processing on the end portion of the pipe by using the processing machine to which a cutting tool is attached. 8. The pipe processing method according to claim 5, wherein the processing step includes a rib removing step of removing ribs provided on an inner wall surface of the pipe at the end portion by using the processing machine equipped with a drill. The processing step includes the groove processing step and
a rib removing step of removing ribs provided on the inner wall surface of the pipe at the end portion by the processing machine equipped with a drill;
The pipe processing method according to claim 7, further comprising the step of replacing the cutting tool and the drill of the processing machine. The tube to be processed is a tube to be repaired, of a plurality of furnace wall tubes constituting a furnace wall, a part of which is cut off and has a cut end portion,
The method for processing a tube according to any one of claims 5 to 9, wherein the positioning step, the operating step, and the processing step are performed with the positioning saddle positioned on the outer side of the furnace wall and the pressing portion positioned on the inner side of the furnace wall. The tube processing method according to claim 10, wherein the tube thickness of the tube to be repaired at the inner-furnace portion is smaller than the tube thickness of the tube to be repaired at the outer-furnace portion. The tube processing method according to claim 10, wherein the tube thickness of the inner-furnace portion of the tube to be repaired is greater than the tube thickness of the outer-furnace portion of the tube to be repaired.