JP2009072795A - Welding tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a welding tool which can be mounted on the connecting portion of a cylindrical duct, and can exactly perform temporal fixing without damaging the cylindrical ducts which have a thin wall thickness and are easily deformed by their weight. <P>SOLUTION: The welding tool 10 temporarily fixes a plurality of cylindrical ducts 90 having a flange 90b on the outer periphery of the open end of the cylindrical portion 90a in the state that their flanges 90b are abutted against each other. The welding tool 10 comprises a belt shape member 11 to be wound on the outer periphery of the abutted flanges 90b, bolts 13b and nuts 13n for serving as connecting means for generating a fastening force of the belt shape member 11, nut members 15, bolts 14 for serving as pressing means provided on the inner periphery of the belt shape member 11 in order to bring the flange 90b into pressure contact with each other in the axial direction, and a plurality of through-holes 12 opened on the belt shape member 11 at a required interval along its longitudinal direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a welding jig used when connecting cylindrical ducts, which are constituent members of a large-diameter duct disposed as a gas supply / discharge path of factory equipment, by welding.

  A large-diameter duct disposed as a gas supply / exhaust path of factory equipment is extended by carrying a cylindrical duct having a predetermined length into a construction site and connecting the open ends thereof by welding. This cylindrical duct is long and relatively thin, and it is difficult to put in and out the fixing jig from the inner surface of the duct during on-site welding. For this reason, the method of providing a flange in the outer periphery of the opening end of a cylindrical duct, and welding the abutted flanges is taken. However, a thin cylindrical duct is often distorted by its own weight, and the heat generated when welding the flange may cause a circular distortion or a flange deformation.

  Therefore, as shown in FIG. 10, after the flanges 90b formed at the open ends of the cylindrical duct 90 are butted together, a plurality of clamps 91 are attached along the entire circumference of the flange 90b, and the cylindrical portion 90a and the flange 90b are connected. The flanges are welded after each clamp 91 is tightened while correcting for distortion and misalignment.

  On the other hand, there has been proposed a jig for temporarily fixing a butt portion when butt-welding cylindrical steel pipes without a flange (for example, see Patent Documents 1 and 2).

Japanese Utility Model Publication No. 4-119678 JP-A-8-267289

  The construction method shown in FIG. 10 requires a lot of time and labor because it has to be aligned while fixing a large number of clamps at the abutting portion between the flanges of the cylindrical duct and correcting for distortion and misalignment. In addition, the cylindrical ducts cannot be set at accurate positions.

  On the other hand, since the jigs described in Patent Documents 1 and 2 have a structure suitable for mounting on a butted portion between cylindrical steel pipes without a flange, a cylindrical shape having a flange on the outer periphery of the opening end. It cannot be attached to the butt portion between ducts. In addition, since the use object of the jig described in Patent Document 1 is limited to a thick steel pipe that does not distort by its own weight, when used for a large-diameter cylindrical duct that is thin and easily distorted by its own weight, The cylindrical duct is deformed by the pressing force when tightening the butt adjustment bolt (radial push bolt 14). For this reason, not only the butting adjustment cannot be performed, and the cylindrical duct may be damaged.

  Therefore, the problem to be solved by the present invention is that it can be easily and quickly attached to the connecting portion of the cylindrical duct even when the fixing jig cannot be set on the inner surface of the duct during welding work on site. An object of the present invention is to provide a welding jig that can be temporarily fixed accurately without damaging cylindrical ducts that are thin and have a low weight and are easily distorted.

  The welding jig of the present invention is a welding jig for temporarily fixing a plurality of cylindrical ducts having flanges on the outer periphery of the open end in a state in which the flanges are butted against each other, and is a belt-like shape wound around the outer circumference of the butted flanges A member, a fastening means for generating a fastening force on the belt-like member, a pressing means provided on the belt-like member for crimping the flanges in the axial direction, and a predetermined interval along the longitudinal direction of the belt-like member And a plurality of established through holes.

  With such a configuration, the flanges of the two cylindrical ducts to be connected are butted together, a belt-like member is wound around the outer periphery of the flange, and a fastening force is generated on the belt-like member by fastening means to By tightening, the axial centers of the two cylindrical ducts can be made to coincide with each other while eliminating distortion caused by its own weight or the like. And if the flanges which faced are crimped | bonded to an axial direction by a press means, since flanges closely_contact | adhere without gap, cylindrical ducts can be temporarily fixed correctly. Once temporarily fixed, temporary welding (spot welding) is performed on the butted portions of the flanges via a plurality of through holes provided in the belt-shaped member. Once all of the through holes have been temporarily welded (spot welded), the welding jig is removed from the butt portion of the flanges, and the main welding is performed over the entire circumference of the butt portion, the connection of the cylindrical duct is completed. To do.

  As described above, after the belt-like member is wound around the outer periphery of the abutted flange and tightened, the abutted flanges are crimped in the axial direction by the pressing means, so that the setting is completed. Can be worn in time. In addition, since the cylindrical duct is not directly pressed in the radial direction, even if the cylindrical ducts having large thickness and having a small thickness and easily distorted are easily fixed temporarily without being damaged. it can.

  Here, as the pressing means, it is desirable to provide a screw mechanism capable of pressing in the direction in which the butted flanges are pressed together or a wedge mechanism that presses while holding the flanges in between. If the screw mechanism is provided, the butted portion of the flange can be firmly pressed by a simple operation of tightening the screw. In addition, if the wedge mechanism is provided, the butted portion of the flange can be firmly pressure-bonded by a simple operation of sandwiching the flanges by the wedge mechanism and fastening the band-shaped member.

  Moreover, it is desirable to provide the said press means in the position which can be visually confirmed through the said through-hole from the outer peripheral side of the said strip | belt-shaped member. With such a configuration, the pressure-bonded state by the pressing means can be visually confirmed through the through hole, so that the flanges can be securely bonded to each other.

  On the other hand, as the fastening means, it is possible to provide a screw mechanism that connects the end portions of the belt-shaped member so as to be attachable / detachable and approachable / separable. With such a configuration, the butted portion of the flange can be firmly tightened by a simple operation of tightening the screw.

  Moreover, the said strip | belt-shaped member can also be formed with the some circular arc-shaped member which can mutually be connected and isolate | separated. With such a configuration, by changing the number of connected arc-shaped members, or by connecting in combination with arc-shaped members having different lengths, the cylindrical ducts are mounted according to the size of the outer diameter. be able to. Moreover, the storage space when not in use can be reduced.

  Next, the welding jig of the present invention is a welding jig for temporarily fixing a plurality of cylindrical ducts having no flanges on the outer periphery of the opening end in a state where the opening ends are butted against each other. A belt-like member wound around an outer periphery, a fastening means for generating a fastening force on the belt-like member, a pressing means connected to the belt-like member for crimping the opening ends in the axial direction, and a longitudinal direction of the belt-like member And a plurality of through-holes opened at predetermined intervals along.

  With such a configuration, the belt-shaped member is wound around the outer periphery of the abutted opening ends, tightened by the fastening means, and the opening ends can be crimped in the axial direction by the pressing means connected to the belt-shaped member. It is possible to temporarily fix a plurality of cylindrical ducts having no flanges on the outer periphery thereof in an accurate state in a state where their open ends are butted together.

  According to the present invention, a welding process that can be easily and quickly attached to a connecting portion of a cylindrical duct and can be temporarily fixed accurately without damaging the cylindrical ducts that are thin and have their own weight and are easily distorted. Tools can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a perspective view showing a usage state of a welding jig according to a first embodiment of the present invention, FIG. 2 is a perspective view showing a mounting process of the welding jig shown in FIG. 1, and FIG. 3 is a partially enlarged view of FIG. 4 is a partially enlarged view of FIG. 2, and FIG. 5 is a cross-sectional view taken along line AA in FIG.

  As shown in FIGS. 1 and 2, the welding jig 10 according to the present embodiment temporarily supports a plurality of cylindrical ducts 90 having flanges 90b on the outer periphery of the opening end of the cylindrical part 90a in a state where the flanges 90b abut each other. It is a jig for fixing. The welding jig 10 is for crimping the strip member 11 wound around the outer periphery of the butted flange 90b, the bolt 13b and the nut 13n, which are fastening means for generating a tightening force to the strip member 11, and the flange 90b in the axial direction. A nut member 15 and a bolt 14 which are pressing means provided on the inner periphery of the belt-like member 11, and a plurality of through holes 12 which are opened at predetermined intervals along the longitudinal direction of the belt-like member 11 are provided.

  The belt-shaped member 11 is composed of two arc-shaped members 11s, and two bolts 13b for connecting the bent portions 11a formed at both ends of the arc-shaped member 11s are inserted into the bent portions 11a, A nut 13n is screwed to the front end side of the bolt 13b. By these bolts 13b and nuts 13n, the ends of the arc-shaped member 11s constituting the belt-like member 11 can be connected to each other so as to be detachable and accessible / separable. As will be described later, the number of arc-shaped members 11s constituting the band-shaped member 11 is not limited to two, so that the band-shaped member can be composed of one or three or more arc-shaped members 11s.

  As shown in FIGS. 3 and 4, the nut member 15 is opposed to the substantially square-shaped through-hole 12 provided in the arc-shaped member 11 s and is orthogonal to the longitudinal direction of the arc-shaped member 11 s. In this state, it is fixed to the inner peripheral surface of the arc-shaped member 11s. Bolts 14 are screwed onto the nut members 15 so that the tightening direction of the nut members 15 is opposed to the through holes 12.

  As shown in FIG. 2, the flanges 90b of the two cylindrical ducts 90 to be connected are butted together, the belt-like member 11 is wound around the outer periphery of the flanges, and the belt-like member is formed by bolts 13b and nuts 13n as shown in FIG. When a tightening force is generated in 11 and the outer periphery of the flange 90b is tightened, distortion of the flange 90b and the cylindrical portion 90a is corrected by the tightening force, and the axial centers 90c (see FIG. 5) of the two cylindrical ducts 90 are connected to each other. Match.

  In the initial stage of the tightening operation, the tightening force applied from the belt-like member 11 to the outer periphery of the flange 90b acts intensively on the distorted portion, but the flange force is applied so that the tightening force acts evenly on the entire outer periphery of the flange 90b. Since 90b itself deforms in a direction approaching a perfect circle, the distortion of the flange 90b is gradually corrected as the tightening operation proceeds.

  Then, as shown in FIG. 5, by tightening the bolts 14 and crimping the butted flanges 90b in the axial center 90c direction, the waveform distortion remaining on the flange 90b is corrected, and the flanges 90b are not spaced apart from each other. Because of the close contact, the cylindrical ducts 90 can be temporarily fixed accurately. Thereafter, the butted portions of the flanges 90b are temporarily welded (spot welded) through the plurality of through holes 12 opened in the belt-like member 11. In this case, TIG welding is preferable, but not limited thereto.

  As described above, after the band-like member 11 is wound around the outer periphery of the butted flange 90b and tightened with the bolt 13b and the nut 13n, the set is completed by crimping the butted flanges 90b with the bolt 14 in the axial center 90c direction. It can be easily and quickly attached to the connecting portion of the cylindrical duct 90a. Moreover, since the welding jig 10 does not directly press the cylindrical duct 90a in the radial direction, even if the cylindrical ducts 90a having a small thickness and having a small weight and easily distorted are not damaged, It can be temporarily fixed accurately.

  As the pressing means, the bolt 14 and the nut member 15 are provided to press the back surfaces of the butted flanges 90b in the crimping direction, so that the butted portion of the flange 90b is firmly crimped by a simple operation of tightening the bolts 14. can do.

  Further, a bolt 14 and a nut member 15 which are pressing means are provided at a position where the belt-like member 11 is visible from the outer peripheral side through the through hole 12. Accordingly, since the tightening operation can be performed while visually confirming the crimped state by the bolt 14 through the through hole 12, the flanges 90b can be reliably brought into close contact with each other.

  On the other hand, a bolt 13b and a nut 13n for connecting the bent portions 11a at the end of the arc-shaped member 11s so as to be attachable / detachable and accessible / separated are provided as fastening means for generating a tightening force on the belt-like member 11. Therefore, the butted portion of the flange 90b can be firmly tightened by a simple operation of tightening the screws (bolts 13b and nuts 13n).

  Since the belt-like member 11 of the present embodiment is composed of two arcuate members 11s that can be connected and separated from each other, the storage space can be reduced by separating them when not in use. Further, by changing the number of connected arc-shaped members 11s, it is possible to cope with the size of the outer peripheral length of the flange of the cylindrical duct. That is, as shown in FIG. 6, if a strip-shaped member is constituted by three arc-shaped members 11s, it can be used for a cylindrical duct having a flange whose outer peripheral length is longer than the flange 90b. In this case, as shown in FIG. 6, if arc-shaped members 11x and 11y having a shorter length than the arc-shaped member 11s are prepared, the outer peripheral length of the flange is not a multiple of the length of the arc-shaped member 11s. It is possible to deal with cases. In addition, since the number of the arc-shaped members constituting the belt-shaped member is not limited, it may be composed of one member that can be continuously wound around the flange, or may be composed of three or more arc-shaped members. it can.

  Next, a second embodiment of the present invention will be described based on FIGS. FIG. 7 is a perspective view showing a part of a welding jig according to the second embodiment of the present invention, and FIG. 8 is a cross-sectional view showing a mounting process of the welding jig shown in FIG.

  As shown in FIG. 7, in the present embodiment, four pressing members 16 are fixed upright on the inner peripheral surface of the band-shaped member 11 so as to surround the four corners of each through-hole 12 formed in the band-shaped member 11. Has been. In the facing portion between the pressing members 16, the guide surface 16 a is formed so as to be inclined toward the inner peripheral surface of the band-shaped member 11, and the guide surface 16 a faces the inner peripheral surface of the band-shaped member 11. And a fixed surface 16b formed so as to be parallel to each other.

  As shown in the upper part of FIG. 8, the belt-like member 11 is wound around the abutting portion of the flange 90 b of the cylindrical duct 90, and the abutting portion of the flange 90 b is positioned between the guide surfaces 16 a of the pressing members 16 facing each other. Then, as the belt-like member 11 is tightened, the opposing guide surfaces 16a abut against the outer periphery of the flange 90b, respectively, and the two flanges 90b are sandwiched by the wedge mechanism constituted by the opposing guide surfaces 16a, and are separated from each other The outer periphery of the flange 90b is crimped. When the tightening of the belt-like member 11 is finished, as shown in the lower part of FIG. 8, the outer periphery of the two flanges 90b is inserted between the opposing fixing surfaces 16b, and the flanges 90b are temporarily fixed in a close contact state. Thereafter, the butted portion of the flange 90b can be temporarily welded (spot welded) through the through hole 12.

  In the case of the present embodiment, the band-shaped member 11 is wound around the abutting portion of the flange 90b of the cylindrical duct 90, the abutting portion of the flange 90b is disposed between the pressing members 16, and then the band-shaped member 11 is tightened. Can be temporarily fixed. As described above, the axial centering of the cylindrical portion 90b of the cylindrical duct 90, the correction of the distortion, and the crimping of the flanges 90b can be performed only by tightening the belt-like member 11, thereby simplifying the operation. Can do.

  Next, another embodiment will be described with reference to FIG. FIG. 9 is a perspective view showing a usage state of a welding jig according to another embodiment. The welding jig 20 of the present embodiment is a welding jig that temporarily fixes a plurality of cylindrical ducts 90x without flanges on the outer periphery of the opening end 90d in a state where the opening ends 90d face each other. The welding jig 20 includes a belt-like member 21 wound around the outer periphery of the opened opening end 90d, a fastening means (bolt 13b and nut 13n) for generating a fastening force on the belt-like member 21, and the opening ends 90d in the axial direction. A screw mechanism (a bolt 25, a nut member 24, and a bolt holding portion 22) for approaching and separating the two band-shaped members 23 arranged with the band-shaped member 21 sandwiched between them, and the longitudinal direction of the band-shaped member 21 And a plurality of through-holes 12 opened at predetermined intervals. The bolt 25 is screwed into the nut member 24 in a penetrating manner, and the tip thereof is rotatably locked to the bolt holding portion 22.

  As shown in FIG. 9, the belt-like member 21 is wound around the outer periphery of the open end 90d that is abutted, and the two belt-like members 23 are wound around the cylindrical duct 90x, and the belt-like members 21 and 23 are tightened by bolts 13b and nuts 13n. Then, axial alignment between the cylindrical ducts 90x and distortion correction are performed. When the bolt 25 is rotated in the tightening direction, a force in the approaching direction is applied to the two cylindrical ducts 90x via the belt-like member 23, so that the open ends 90d of the cylindrical duct 90x are crimped in the axial direction. And temporarily fixed in close contact.

  As described above, when the welding jig 20 is used, a plurality of cylindrical ducts 90x without flanges on the outer periphery of the opening end 90d can be temporarily fixed accurately in a state where the opening ends 90d face each other. When the bolt 25 is rotated in the tightening direction, the outer peripheral surface near the opening end 90d of the cylindrical duct 90x and the band-shaped member 21 are formed so that the opening ends 90d of the cylindrical duct 90x are easily crimped in the axial direction. It is desirable to employ means for reducing friction with the inner peripheral surface (for example, providing a low friction layer on the inner peripheral surface of the band-shaped member 21).

  In addition, the welding jig 20 does not directly press the cylindrical duct 90x in the radial direction, like the welding jig 10 (see FIG. 1), so that the large-diameter cylindrical duct is thin and has its own weight and is easily distorted. Even 90x can be temporarily fixed accurately without damaging them.

  The welding jig of the present invention can be widely used in welding work of a large-diameter duct provided as a gas supply path for factory equipment.

It is a perspective view which shows the use condition of the welding jig which is 1st Embodiment of this invention. It is a perspective view which shows the mounting process of the welding jig shown in FIG. FIG. 3 is a partially enlarged view of FIG. 2. FIG. 3 is a partially enlarged view of FIG. 2. It is the sectional view on the AA line in FIG. It is a figure which shows other embodiment regarding a strip | belt-shaped member. It is a perspective view which shows a part of welding jig which is 2nd Embodiment of this invention. It is sectional drawing which shows the mounting process of the welding jig shown in FIG. It is a perspective view which shows the use condition of the welding jig which is other embodiment. It is a figure which shows the use condition of the conventional welding jig.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,20 Welding jig 11, 21, 23 Band-shaped member 11a Bending part 11s, 11x, 11y Arc-shaped member 12 Through-hole 13b, 14, 25 Bolt 13n Nut 15, 24 Nut member 16 Pressing member 16a Guide surface 16b Fixed surface 22 Bolt holding part 90, 90x Cylindrical duct 90a Cylindrical part 90b Flange 90c Axis center 90d Open end

Claims (6)

A welding jig for temporarily fixing a plurality of cylindrical ducts having flanges on the outer periphery of the open end in a state where the flanges are butted against each other,
A belt-like member wound around the outer periphery of the abutted flange, a fastening means for generating a fastening force on the belt-like member, a pressing means provided on the belt-like member for crimping the flanges in the axial direction, and the belt-like member And a plurality of through-holes opened at predetermined intervals along the longitudinal direction of the welding jig. A welding jig that temporarily fixes a plurality of cylindrical ducts without flanges on the outer periphery of the opening end in a state in which the opening ends are butted together,
A belt-like member wound around an outer periphery of the abutted opening end, a fastening means for generating a fastening force on the belt-like member, a pressing means connected to the belt-like member in order to crimp the opening ends in an axial direction, A welding jig comprising: a plurality of through holes opened at predetermined intervals along the longitudinal direction of the belt-shaped member.   The welding jig according to claim 1, wherein a screw mechanism capable of pressing in a direction in which the flanges that are butted together are pressed or a wedge mechanism that presses the flanges while sandwiching the flanges is provided as the pressing means.   The welding jig according to claim 1 or 3, wherein the pressing means is provided at a position that can be seen through the through hole from the outer peripheral side of the belt-like member.   The welding jig according to any one of claims 1 to 4, wherein a screw mechanism is provided as the fastening means to connect the end portions of the belt-like member so as to be attachable / detachable and approachable / separable.   The welding jig according to any one of claims 1 to 5, wherein the belt-shaped member is formed of a plurality of arc-shaped members that can be connected and separated from each other.

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