JP3183406U - Boiler tube temporary welding jig - Google Patents

Abstract

To provide a boiler tube temporary welding jig capable of easily fixing pipe ends to each other even in a narrow place.
SOLUTION: A pair of sandwiching plates that sandwich the butted portions of two boiler tubes 5 whose tube ends are butted together, and a pressing mechanism that presses the butted portions against the pair of sandwiching plates. It comprises. Each of the pair of clamping plates is preferably provided with an opening 6 that exposes the butted portion for temporary welding. By providing the opening 6 in each clamping plate, a part of the butted portion can be exposed. Temporary welding of the butt portion can be performed from the opening portion.
[Selection] Figure 2

Description

  The present invention relates to a boiler tube temporary welding jig used for temporarily welding a boiler tube.

  A waste incinerator or the like is provided with a boiler for exchanging the generated waste heat. FIG. 1 is a schematic diagram showing such a boiler. The boiler includes a pair of drums, and the pair of drums are connected by a plurality of boiler tubes.

  A plurality of boiler tubes are exposed to a high heat atmosphere and may deteriorate with aging. Deteriorated boiler tubes need to be replaced. When exchanging the boiler tube, a great deal of labor is required to replace all of the single boiler tube. Therefore, as shown in FIG. 1, only the deteriorated portion is cut, and only the cut portion is replaced with a new boiler tube. The new boiler tube is connected to the remaining boiler tube by welding.

  In order to accurately weld the boiler tubes, it is important to fix the tube ends so as not to be displaced. A welding jig may be used to accurately match the tube ends. When using a welding jig, temporary welding is performed in a state where the pipe ends are fixed by the welding jig. Thereafter, main welding is performed.

  As welding jigs for fixing the pipe ends, for example, Patent Document 1 (Japanese Patent Laid-Open No. 5-192793), Patent Document 2 (Japanese Patent Laid-Open No. 2002-66788), Patent Document 3 (Japanese Patent Laid-Open No. No. 227698), Patent Document 4 (Japanese Patent Laid-Open No. 8-93965), and Patent Document 5 (Japanese Patent Laid-Open No. 11-226784) are known.

  Here, in the boiler as shown in FIG. 1, a plurality of boiler tubes are often arranged at narrow intervals. Therefore, when exchanging a part of the boiler tube, an exchanging operation including welding or the like must be performed in a narrow place. It is difficult to use a large welding jig in a narrow place. It is also difficult to use a welding jig that requires complicated operations.

  Therefore, there is a demand for a technique that can easily fix the boiler tubes to each other even in a narrow place.

JP-A-5-192793 JP 2002-66788 A Japanese Unexamined Patent Publication No. 7-227698 JP-A-8-93965 JP-A-11-226784

  An object of the present invention is to provide a boiler tube temporary welding jig capable of easily fixing boiler tubes to each other even in a narrow place.

  Hereinafter, means for solving the problem will be described using reference numerals with parentheses used in [Mode for Carrying Out the Invention]. These codes are added to clarify the correspondence between the description in [Scope of request for utility model registration] and the description in [Mode for carrying out the invention]. It should not be used to interpret the technical scope of the device described in [Scope].

A boiler tube temporary welding jig according to the present invention presses a pair of clamping plates and a pair of clamping plates that clamp the butted portions of two boiler tubes (5) whose tube ends are butted together. And a pressing mechanism for tightening the butted portion.
According to the present invention, by using a pair of clamping plates, it is possible to easily fix the two boiler tubes in a state where the tube ends are butted together.

Each of the pair of clamping plates is preferably provided with an opening (6) for exposing the butted portion for temporary welding.
By providing the opening (6) in each clamping plate, a part of the butt portion can be exposed. Temporary welding of the butt portion can be performed from the opening portion.

In one form of the boiler tube temporary welding jig of the present invention, an L-shaped angle portion (1) in which each of the pair of clamping plates is bent so that the cross-section is L-shaped along the folding line. And an eaves part (2) coupled to the end of the L-shaped angle part (1). The flange portions (2) of the pair of sandwiching plates extend so as to face each other when the butted portion is sandwiched on the inner angle side of the L-shaped angle portion (1). The pressing mechanism is configured to tighten the flanges (2) of the pair of sandwiching plates.
According to this device, the butt portion is held between the pair of L-shaped angle portions (1). Thereby, two boiler tubes (5) can be fixed with sufficient position accuracy.
Moreover, the position of two boiler tubes (5) is fixed by applying a press to a collar part (2). Since it is not necessary to directly press the L-shaped angle portion (1) that sandwiches the two boiler tubes (5), the two boiler tubes (5) can be easily fixed even in a narrow place.

  The pressing mechanism preferably includes a bolt that penetrates the flanges (2) of the pair of sandwiching plates.

In another embodiment of the boiler tube temporary welding jig of the present invention, the pressing mechanism is provided with a giant clam vise mechanism. The giant clam vise mechanism has a fixed side holding part (9) that is fixed and a movable side holding part (10) that faces the fixed side holding part (9) and is movable at a distance from the fixed side holding part (9). With. One of the pair of clamping plates is supported by the fixed clamping unit (9). The other of the pair of clamping plates is supported by the movable clamping unit (10).
According to this device, the two boiler tubes (5) can be fixed without using a large-sized device by using the giant clam vise mechanism.

  Each of the pair of sandwiching plates includes an L-shaped angle portion (1) which is bent so that the cross section is L-shaped along the folding line. The pair of clamping plates are attached to the giant vise mechanism so as to face each other at the inner corners of the L-shaped angle portion (1).

  Each of the pair of clamping plates is preferably joined to each of the fixed-side clamping part (9) and the movable-side clamping part (10) at the fold line part of the L-shaped angle part (1).

  The giant clam vise mechanism further includes a main body part (7) coupled to the fixed-side clamping part at one end, a screw insertion part (8) provided at the other end of the main body part (7), and a screw insertion part ( 8) and a screw rod (11) coupled to the movable side holding portion (10) at the tip. A rotating portion (12) for rotating the screw rod (11) is provided at the base end portion of the screw rod (11).

In still another embodiment of the boiler tube temporary welding jig according to the present invention, the pressing mechanism includes a vice plier mechanism having a pair of clamping portions (15, 16). Each of the pair of clamping plates is coupled to each of the pair of clamping parts.
According to this device, the two boiler tubes (5) can be fixed without using a large apparatus by using the vice plier mechanism.
Moreover, two boiler tubes (5) can be fixed by operation with one hand by using a vice plier mechanism. Therefore, the two boiler tubes (5) can be fixed more easily even in a narrow place.

  Each of the pair of sandwiching plates is connected to a welded portion (14-2) welded to one of the pair of sandwiched portions, and the welded portion (14-2), and has an outer shape of two boiler tubes (5). And an abutting portion (14-1) that curves to correspond.

  The vice plier mechanism is further supported by the fixed member (27), the movable member (28) pivotally supported by the fixed member (27), and the movable member (28). A grip (17) and a lock mechanism (26) for fixing the relative positions of the fixed side member (27) and the movable side member (28) are provided. When the grip (17) is attracted to the fixed side member (27), the distal end portion of the movable side member (28) approaches the distal end portion of the fixed side member (27), and the fixed side member is moved by the lock mechanism (26). The relative position between (27) and the movable member (28) is locked. One of the pair of sandwich plates (14) is coupled to the tip of the fixed member (27), and the other of the pair of sandwich plates (14) is coupled to the tip of the movable member (28). ing.

  The boiler tube temporary welding method according to the present invention includes two boiler tubes (5) by a step of arranging the two boiler tubes (5) so that the tube ends face each other and the above-described boiler tube temporary welding jig. After the step of clamping the butt portion of the tube (5) and the step of fixing the two boiler tubes (5) by tightening the butt portion by the pressing mechanism, the butt portion is temporarily Welding.

  ADVANTAGE OF THE INVENTION According to this invention, the jig | tool for boiler tube temporary welding which can fix pipe ends easily even in a narrow place is provided.

It is the schematic which shows a boiler. It is the schematic which shows the boiler tube temporary welding jig | tool which concerns on 1st Embodiment. It is the schematic which shows the boiler tube temporary welding jig | tool which concerns on 2nd Embodiment. It is the schematic which shows the boiler tube temporary welding jig | tool which concerns on 3rd Embodiment. It is the schematic which shows the boiler tube temporary welding jig | tool which concerns on 3rd Embodiment. It is the schematic which shows the boiler tube temporary welding jig | tool which concerns on 3rd Embodiment.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 2 schematically shows a boiler tube temporary welding jig according to this embodiment.

  The two boiler tubes 5 (5-1, 5-2) fixed by the boiler tube temporary welding jig are arranged with their tube ends facing each other. The boiler tube temporary welding jig holds the butted portions of the two boiler tubes 5.

  The boiler tube temporary welding jig includes a pair of clamping plates and a pressing mechanism (nuts 3-1 and bolts 3-2).

  Each of the pair of sandwiching plates includes an L-shaped angle portion 1 and a flange portion 2.

  The L-shaped angle portion 1 is a portion that is bent so that the cross-section is L-shaped. The boiler tube 5 is clamped on the inner angle side of the L-shaped angle portion 1. The pair of clamping plates clamps the boiler tube 5 so that the folding line of the L-shaped angle portion 1 is along the tube length direction of the boiler tube 5.

  The L-shaped angle portion 1 is in contact with both of the two boiler tubes (5-1, 5-2). The width in the tube length direction of the L-shaped angle portion 1 is set to such a length that the relative positions of the two boiler tubes (5-1, 5-2) can be firmly fixed.

  The L-shaped angle portion 1 is provided with an opening 6 for temporary welding. A part of the butted portion of the boiler tube 5 is exposed through the opening.

  The flange portion 2 is coupled to both ends of the L-shaped angle portion 1 in the direction straddling the boiler tube 5. That is, each clamping plate is further bent at both ends of the L-shaped angle portion 1.

  The collar part 2 of one clamping plate is opposed to the collar part 2 of the other clamping plate.

  The pressing mechanism is a mechanism that tightens the flanges 2 between a pair of clamping plates. The pressing mechanism includes a bolt 3-2 that penetrates both of the facing flanges 2 and a nut 3-1 for tightening the bolt 3-2. The L-shaped angle portion 1 tightens the two boiler tubes 5 by tightening the flange portions 2 with the bolt 3-2 and the nut 3-1. Thereby, the butt | matching part of the two boiler tubes 5 is fixed.

  Then, the temporary welding method of the boiler tube 5 in this embodiment is demonstrated.

  First, in the boiler as shown in FIG. 1, the deteriorated portion of the boiler tube 5 is cut and removed. And the new boiler tube 5 is set to the cut | disconnected area | region.

  Next, in a state where the bolt 3-2 is loosened, the boiler tube temporary welding jig is attached to a butt portion between the new boiler tube and the existing boiler tube. At this time, the boiler tube temporary welding jig is attached so that the butted portion is exposed from the opening 6 provided in the L-shaped angle portion 1.

  Next, the bolt 3-2 is turned, and the flange portions 2 of the pair of sandwiching plates are tightened with the nut 3-1 and the bolt 3-2. Thereby, the force that the L-shaped angle portions 1 approach each other is applied, and the butted portion is fixed.

  Next, the butt portion is temporarily welded from the opening 6 provided in the L-shaped angle portion 1. Thereafter, the boiler tube temporary welding jig is removed and main welding is performed.

  According to the above-described method, when the butted portion of the boiler tube 5 is fixed, the butted portion is not directly pressed against the L-shaped angle portion 1 but from the L-shaped angle portion 1 via the flange portion 2. Will be pressed. If the boiler tube temporary welding jig is attached so that the flange portion 2 is located on the side where the work can be easily performed, the butted portion can be easily fixed even if the boiler tube itself is disposed in a narrow place.

  Moreover, since a pair of clamping board which has the L-shaped angle part 1 is used, the boiler tube 5 will be fixed in four places. As a result, the pipe ends can be fixed with high positional accuracy.

  Moreover, since the opening 6 for temporary welding is provided in the L-shaped angle part 1, temporary welding can be easily performed with the jig attached.

  In addition, in this embodiment, the collar part 2 was provided in the both ends of the L-shaped angle part 1, and the case where the press mechanism (bolt and nut) was each provided in the collar part 2 of both ends was demonstrated. . However, the pressing mechanism does not need to be provided on each of the flange portions 2 at both ends, and may be attached only to the flange portion 2 on one side.

(Second Embodiment)
Subsequently, a second embodiment of the present invention will be described. FIG. 3A is a side view schematically showing the boiler tube temporary welding jig according to the present embodiment.

  In the present embodiment, a pair of L-shaped angles 1 are used as the pair of clamping plates. Moreover, the shrimp vise mechanism which supports a pair of L-shaped angle 1 is used as a press mechanism.

  The pair of L-shaped angles 1 are opposed so that the inner angle sides face each other. The butted portion of the boiler tube 5 is sandwiched between a pair of L-shaped angles 1. Although not shown in FIG. 3A, as in the L-shaped angle portion 1 in the first embodiment, the width of the L-shaped angle 1 in the tube width direction is such that the relative positions of the two boiler tubes 5 are firmly set. It is set to a length that can be fixed. Further, as shown in FIG. 3B, similarly to the first embodiment, the L-shaped angle 1 may be provided with an opening 6 for temporary welding.

  Each of the pair of L-shaped angles 1 is supported by the giant clam vise mechanism at the bent portion.

  The giant clam vise mechanism includes a vise body part 7, a fixed side holding part 9, a movable side holding part 10, and a screw rod 11.

  The fixed-side clamping part 9 is provided at one end of the vise main body part 7. One L-shaped angle 1 is welded to the fixed side clamping portion 9 at the bent portion.

  A screw insertion portion 8 is provided at the other end of the vise body portion 7. The vise main body part 7 extends from the fixed side clamping part 9 toward the screw insertion part 8 while being curved.

  The screw insertion portion 8 is provided with an opening, and a screw rod 11 is inserted into the opening. The opening of the screw insertion portion 8 is provided so that the inserted screw rod 11 faces the fixed-side clamping portion 9. A screw thread corresponding to the screw rod 11 is provided in the opening provided in the screw insertion portion 8, and the screw rod 11 and the screw thread are engaged with each other. As a result, when the screw rod 11 rotates, the screw rod 11 moves in its length direction.

  The movable clamping part 10 is provided at the tip of the screw rod 11 (end on the fixed clamping part 9 side). An L-shaped angle 1 is welded to the movable side holding portion 10 at a bent portion. The movable side clamping unit 10 is connected to the screw rod 11 via a ball joint (not shown) or the like, and even if the screw rod 11 rotates, the movable side clamping unit 10 does not rotate.

  A rotating portion 12 for turning the screw rod 11 is provided at the base end portion of the screw rod 11. The rotating part 12 is provided with an opening 13. The screw rod 11 can be rotated by inserting a rod into the opening 13 and rotating the rod.

  With the configuration as described above, in the giant clam vise mechanism, the movable side clamping unit 10 is movable with respect to the fixed side clamping unit 9. When the screw rod 11 is rotated by the rotating portion 12, the screw rod 11 is moved, and the distance between the movable side holding portion 10 and the fixed side holding portion 9 is changed.

  Then, the temporary welding method of the boiler tube in this embodiment is demonstrated.

  Similar to the first embodiment, the deteriorated portion of the boiler tube is cut and removed. Then, a new boiler tube is set in the cut area.

  Next, a boiler tube temporary welding jig is attached to a butt portion between a new boiler tube and an existing boiler tube, and the two boiler tubes 5 are sandwiched by a pair of L-shaped angles 1.

  Next, a rod such as a hexagon wrench is inserted into the rotating portion 12, and the screw rod 11 is rotated by turning the rod. Thereby, the movable side clamping part 10 is pushed to the fixed side clamping part 9 side. As a result, the two boiler tubes 5 are fixed by the pair of L-shaped angles 1.

  Next, the butt portion is temporarily welded from the portion not covered by the L-shaped angle 1. In the case where the L-shaped angle portion 1 is provided with an opening for temporary welding, the butted portion can be temporarily welded from the opening portion. After the temporary welding is completed, the boiler tube temporary welding jig is removed and the main welding is performed.

  In the present embodiment, as in the first embodiment, since a pair of sandwiching plates having the L-shaped angle portion 1 is used, the boiler tube 5 is fixed at four locations. As a result, the pipe ends can be fixed with high positional accuracy.

  In the present embodiment, the operator can fix the boiler tube 5 by operating the rotating unit 12. The rotating unit 12 is provided at a position away from the boiler tube 5. Therefore, even when working in a narrow place, it is easy to position the rotating unit 12 in a place where the operation is easy. That is, it is possible to easily fix the butt portion even in a narrow place.

(Third embodiment)
Subsequently, a third embodiment of the present invention will be described. FIG. 4 is a side view schematically showing the boiler tube temporary welding jig according to the present embodiment. In FIG. 4, for the convenience of explanation, a tightening direction and a release direction are defined.

  As shown in FIG. 4, in this embodiment, a pair of curved plates 14 (14-1, 14-2) is used as a pair of clamping plates. A vice plier mechanism is used as the pressing mechanism. Each of the pair of curved plates 14 is welded to the vice plier mechanism.

  The vice plier mechanism includes a fixed side member 27, a movable side member 28, a grip 17, an adjustment lever 18, a release lever 20, and a coil spring 25.

  A fixed-side clamping portion 15 is provided at the distal end portion of the fixed-side member 27. A movable side clamping portion 16 is provided at the distal end portion of the movable side member 28.

  The movable side member 28 is rotatably attached to the fixed side member 27 by a pin 24. When the movable side member 28 rotates about the pin 24, the distal end portion of the movable side member 28 and the distal end portion of the fixed side member approach or separate from each other. That is, the movable side clamping part 16 and the fixed side clamping part 15 approach or separate.

  The grip 17 is pivotally supported on the movable side member 28 by a pin 23.

  One end of the coil spring 25 is connected to the movable member 28 between the pin 24 and the pin 23. The other end is connected to the central portion of the fixed member 27. The coil spring 25 is attached in a compressed state, and always pushes the movable side member 28 toward the tightening direction.

  The adjustment lever 18 is pivotally supported on the grip 17 by a pin 22 at one end, and is slidably connected to the fixed member 27 at the other end.

  The release lever 20 is pivotally supported by a pin 21 on the grip 17 at one end. The release lever 20 is provided with a cam portion 26 (lock mechanism). The cam portion 26 is provided on the adjustment lever 18 side.

  The screw 19 is inserted from the proximal end portion of the fixed side member 27 into the fixed side member 27. The screw 19 is in contact with and supports the adjustment lever 18.

  One of the pair of curved plates 14 is welded to the movable-side clamping part 16, and the other is welded to the fixed-side clamping part 15. Each curved plate 14 includes a welded portion 14-2 welded to a vice plier mechanism and an abutting portion 14-1 that curves and extends from the welded portion 14-2. The contact part 14-1 is curved corresponding to the outer shape of the boiler tube 5 to be welded. Although not shown in FIG. 4, the width in the tube length direction of the contact portion 14-1 is firmly fixed to the relative position of the two boiler tubes 5 as in the L-shaped angle portion 1 in the above-described embodiment. The length is set to be able to. Further, the contact portion 14-1 is provided with an opening 6 for performing temporary welding (not shown in FIG. 4).

  The operation | movement in the case of fixing the boiler tube 5 using the above-mentioned boiler tube temporary welding jig | tool is demonstrated. FIG. 5 is a side view showing a state in which the boiler tube 5 is fixed by a boiler tube temporary welding jig. FIG. 6 is a plan view of the boiler tube 5 in a fixed state.

  Similarly to the above-described embodiment, the deteriorated portion of the boiler tube is cut and removed. Then, a new boiler tube is set in the cut area.

  Next, the boiler tube temporary welding jig is disposed so as to sandwich the butted portion of the boiler tube 5 between the pair of contact portions 14-1. Further, the grip 17 and the base end side (the side where the screw 19 is inserted) of the fixed side member 27 are gripped. As a result, the grip 17 is attracted to the stationary member 27. Then, the movable side member 28 is pushed from the grip 17 at the pin 23 portion, and rotates in the tightening direction with the pin 24 as an axis. As a result, the movable side clamping unit 16 approaches the fixed side clamping unit 15 side. Thereby, a pair of curved board 14 contact | abuts to the boiler tube 5 by the contact part 14-1, respectively, and clamps the boiler tube 5. As shown in FIG. Further, by pulling the grip 17 to the fixed side member 27, the cam portion 26 provided on the release lever 20 contacts the adjustment lever 18. Thereby, the adjustment lever 18 is fixed by the cam portion 26, and the positions of the grip 17 and the movable side member 28 are locked. As a result, even if no force is applied to the grip 17 and the fixed side member 27, the pressure for pinching the boiler tube 5 is applied to the curved plate 14, and the boiler tube 5 is fixed.

  As shown in FIG. 6, a part of the butted portion of the boiler tube 5 is exposed from the opening 6 provided in the contact portion 14-1. Therefore, the butt portion of the boiler tube 5 is temporarily welded through the opening 6.

  When temporary welding is completed, the locked state of the boiler tube temporary welding jig is released. To release the locked state, the release lever 20 may be pulled toward the release direction. That is, the release lever is attracted to the fixed side member 27 side. As a result, the cam portion 26 is rotated to release the locked state of the adjustment lever 18, and the movable member 28 can be rotated in the release direction.

  As described above, according to this embodiment, since the boiler tube 5 is fixed by the curved plate 1 corresponding to the outer shape of the boiler tube 5, the pipe ends can be aligned with high positional accuracy.

  Further, in the present embodiment, the boiler tube 5 can be fixed by gripping the proximal end portions of the grip 17 and the fixed side member 27. The base ends of the grip 17 and the fixed side member 27 are provided at positions away from the boiler tube 5. Therefore, even when working in a narrow place, the grip 17 and the fixed side member 27 can be easily located at a place where the operation is easy. That is, the boiler tube 5 can be easily fixed even in a narrow place.

  In the present embodiment, the boiler tube 5 can be fixed by holding the grip 17 and the base end portions of the fixed side member 27 with one hand. Therefore, the boiler tube 5 can be fixed with one hand, and the boiler tube 5 can be fixed more easily.

  The vice plier mechanism shown in the present embodiment is merely an example. If the base end portion of the fixed side member 27 and the grip 17 are gripped, the front end portion of the fixed side member 27 and the front end portion of the movable side member 28 are close to each other and locked, and this embodiment It is also possible to employ a configuration other than that exemplified in.

DESCRIPTION OF SYMBOLS 1 L-shaped angle 2 Hook part 3-1 Nut 3-2 Bolt 4 Clamping part 5 Boiler tube 6 Opening part 70 Vise body part 8 Screw insertion part 9 Clamping part 10 Clamping part 11 Screw rod 12 Rotating part 13 Opening 14 Clamping plate 14-1 Abutting part 14-2 Welding part 15 Fixed side clamping part 16 Movable side clamping part 17 Grip 18 Adjustment lever 19 Screw 20 Release lever 21 Pin 22 Pin 23 Pin 24 Pin 25 Coil spring 26 Cam part 27 Fixed side Member 28 Movable member

Claims (3)

A pair of clamping plates that clamp the butted portions of the two boiler tubes butted at the ends of the tubes;
A pressing mechanism for applying a pressure to tighten the abutting portion against the pair of clamping plates;
Comprising
The pressing mechanism includes a vice plier mechanism having a pair of clamping portions,
Each of the pair of sandwiching plates is a boiler tube temporary welding jig coupled to each of the pair of sandwiching portions. The boiler tube temporary welding jig according to claim 1,
Each of the pair of clamping plates is
A welded portion welded to one of the pair of clamping portions;
A boiler tube temporary welding jig comprising a contact portion that curves and extends from the welded portion so as to correspond to the outer shape of the two boiler tubes. The boiler tube temporary welding jig according to claim 1 or 2,
The vice plier mechanism further includes:
A fixed side member;
A movable member pivotally supported by the fixed member, a grip pivotally supported by the movable member,
A lock mechanism for fixing the relative position of the fixed side member and the movable side member;
When the grip is attracted to the fixed side member, the distal end portion of the movable side member approaches the distal end portion of the fixed side member, and the relative position between the fixed side member and the movable side member by the lock mechanism Is locked,
One of said pair of clamping plates is couple | bonded with the front-end | tip part of the said fixed side member, The other jig | tool of the said pair of clamping plates is couple | bonded with the front-end | tip part of the said movable side member.

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