JP2010260087A - Equipment for manufacturing square steel pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide equipment for manufacturing square steel pipe with which the groove portions (free edge portions) are butted accurately from upper and lower sides even when bending is unstable and a right-angle-like bent parts are bent at either of an obtuse angle (≥90°) or an acute angle (≤90°). <P>SOLUTION: A width guide means 31 of a square-like steel pipe 7 is provided which is conveyed in the length direction on a tack welding line 21 formed with a driving roller conveyer 22. An external straightening device 51 and a tack welding machine 95 are provided in a tack welding part 50 provided on the tack welding line. The external straightening device is composed of a pair of right and left side part holders 55 which are relatively freely approachable and separable and an upper holder 67 which is freely ascendable and descendible. An internal straightening device 100 which is freely movable by being supported and guided by the inner surface of a lower C-shaped steel 6A and freely stoppable in the portion of the tack welding part is provided. In the internal straightening device, a pair of right and left inner pressurizing bodies 118 are provided relatively freely approachably and separably respectively in a plurality of places in the longitudinal direction of the body 101 and an upward supporting body 122 which is freely brought into contact with the downward inner surface of the upper C-shaped steel 6B is provided. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  In the present invention, a pair of C-shaped steel materials formed by bending two portions in the width direction at right angles to form a rectangular steel pipe by overlapping the free end portions from above and below, and then with respect to the abutting portion The present invention relates to a production facility for rectangular steel pipes for performing tack welding.

  Conventionally, the following configuration is provided as this type of equipment. That is, a belt-shaped steel plate is conveyed in the length direction, and grooves are formed on both side edges in the width direction, and two portions near the groove in the width direction of the steel plate are bent at right angles by a forming press device, A bent portion (corner) is formed. Thus, a C-shaped steel material is formed in which a portion between the right-angled bent portions is a fixed-size flat plate portion, and a portion connected to the fixed-size flat plate portion is a pair of half-size flat plate portions. Then, after a pair of C-shaped steel materials are overlapped by abutting the groove portion from above and below, the abutment portion is brought into contact with each flat plate portion (four sides) from the outside by a roll group of the roll device To form a square steel pipe. Then, after performing tack welding on the butted portion by a tack welding machine, by performing inner surface welding and outer surface welding by welding means, the butt welded portion (seam welded portion) is formed on the flat plate portion (two sides). ) Is manufactured.

  At that time, the roll device includes a stand main body, a lower roll fixed to the stand main body, an upper roll that is opposed to the lower roll from above and provided to be movable up and down on the stand main body, and a pair of left and right side rolls. Each side roll is rotatably provided on the support body, and each support body is configured to be detachable from the lateral direction of the stand body and to be fixed at the insertion position. Then, with the roll group of the roll device in the middle, the width pinch rolls and the height pinch rolls are provided by being divided into upper and lower hands.

  Therefore, when the right-angled bent portion is bent at a right angle, the groove portion can be accurately abutted from above and below, and tack welding is performed on the abutting portion while maintaining the shape by a pair of left and right side rolls. Can be suitably performed. In addition, when the bending is unstable and the right-angled bent portion is bent at an obtuse angle (90 degrees or more), the groove portion can be accurately abutted from above and below by pressure correction with a pair of left and right side rolls. Thus, tack welding to the butt portion can be suitably performed (see, for example, Patent Document 1).

JP 2004-188462 A (page 2-4, FIGS. 1 to 4) Japanese Patent Laid-Open No. 10-235432

  However, according to the conventional configuration described above, when the folding is unstable and the right-angled bent portion is bent at an acute angle (within 90 degrees), the groove portion (the free end portion) is accurately butted from above and below. In addition, since the side roll does not act on the half-size flat plate portion bent at an acute angle, it cannot be corrected, and therefore suitable tack welding (seam welding) cannot be performed.

  Therefore, in the invention according to claim 1 of the present invention, the bending end is unstable, and the free-end portion even when the right-angled bent portion is bent at an obtuse angle (90 degrees or more) or an acute angle (within 90 degrees). The object of the present invention is to provide a production facility for a rectangular steel pipe that can be accurately matched from above and below.

  In order to achieve the above-described object, the manufacturing equipment for a rectangular steel pipe according to claim 1 of the present invention is a pair of C-shaped steel members formed by bending two portions in the width direction at right angles, and the free end portions thereof are moved up and down. Is a square steel pipe manufacturing equipment that performs tack welding on the butted portion, and a tack welding line is formed by a drive roller conveyor. A square steel pipe width guide means conveyed in the length direction on the tack welding line is provided, and a tack working section is provided in the tack welding line. And a tack welder, and the outer surface straightening device comprises a pair of left and right side pressers that are relatively close to and away from each other and an upper presser that can be raised and lowered, and is supported on the inner surface of the lower C-type steel material. An inner surface correction device that is movable inside and can be stopped is provided at the portion of the tacking work portion. The inner surface correction device has a pair of left and right inner pressure bodies at a plurality of positions in the front-rear direction of the main body. An upward support is provided that is relatively close to and away from the upper C-shaped steel material and that can be brought into contact with the downward inner surface of the upper C-shaped steel material.

  Therefore, according to the invention of claim 1, before applying the tack welding, the inner surface correction device relatively brings the pair of left and right inner pressurizers closer together, and the outer surface correction device raises the upper presser body, The side pressing body is moved away from the outside. In this state, first, the width of the rectangular steel pipe on the drive roller conveyor is determined by the width guide means, and then the inner surface correction device is placed in the lower C-type steel material positioned and positioned on the tack welding line. Move to stop near the front edge of the lower C-shaped steel. Next, the inner surface correction device is operated, the upper support is brought into contact with the lower inner surface of the upper C-type steel material, the posture of the upper C-type steel material is stabilized, and the inner pressure members are connected to the inner surfaces of the upper and lower C-type steel materials. Abut between them. Thereby, the rectangular steel pipe and the inner surface straightening device can be moved integrally, and this movement is stopped when the front part of the rectangular steel pipe faces the outer surface straightening device of the tacking work part. Then, the upward support is lowered to separate from the downward inner surface of the upper C-type steel material, and both inner pressure members are separated from the inner surface of the rectangular steel pipe, so that the inner surface correction device is separated from the rectangular steel pipe. . In this state, only the inner surface correction device is moved forward and stopped when the inner pressurizing body faces the front end of the rectangular steel pipe.

  Next, both the inner pressure bodies are brought into contact with the inner surface of the rectangular steel pipe so that the flat plate portion bent at an acute angle (within 90 degrees) is pressure-corrected from the inside, and the lower C-type steel material and the upper C-type steel material A square steel pipe in which the free end portion is accurately abutted from above and below. Then, the tack welding machine is operated for welding, and the tack welding is performed at the tip portion of the butt portion of the rectangular steel pipe. Further, when the outer surface is uneven, the outer surface correction device is operated. That is, by lowering the upper presser body and bringing it into contact with the upper surface of the rectangular steel pipe, the upper part of this rectangular steel pipe can be pressure corrected from the outside, and the side presser body is moved inward to the flat plate part. By abutting, the flat plate portion can be pressure-corrected from the outside above and below the abutting portion of the rectangular steel pipe, and then the temporary welding machine is operated for welding.

  After performing tack welding of the tip portion at the butt portion with the tack welding machine as described above, first, the inner surface correction device is reversely operated to separate the inner pressurizing body from the inner surface of the C-type steel material, thereby correcting the outer surface. The device is reversely operated to separate the side presser and the upper presser from the outer surface of the rectangular steel pipe. In this state, the drive roller conveyor is fed to move the square steel pipe forward on the tack welding line by a set distance. At this time, the inner surface correction device is stopped at a position facing the outer surface correction device. Then, after the square steel pipe is moved forward by a set distance and stopped, the inner surface correction device is operated as described above, and the outer surface correction device is also operated as necessary to set the welding operation by the tack welding machine. Move by distance. Repeating the above operations, tack welding the entire length of the butt portion of the rectangular steel pipe by performing tack welding for a set distance multiple times while correcting the pressure from the inside or outside of the square steel pipe. Tack welding can be performed by a machine.

  According to a second aspect of the present invention, there is provided the manufacturing equipment for the rectangular steel pipe according to the first aspect, wherein the pair of C-type steel members are fitted with the lower C-type steel member having the upward opening and the lower C-type steel member having the upward opening. In this state, a suspension device for raising and lowering the upper C-type steel material is provided on the tack welding line, and the upper C-type steel material is lifted by the suspension device. The width of the C-type steel material is determined by the width guide means.

  Therefore, according to the second aspect of the present invention, after the pair of C-type steel materials that have been set are supplied onto the drive roller conveyor, the upper C-type steel material is lifted by the suspension device and is moved upward with respect to the lower C-type steel material. Separate. Thus, the width of both C-shaped steel materials is determined by the width guide means in a state where the upper C-shaped steel materials are lifted by the suspension device. Then, the inner surface correction device is moved into the lower C-shaped steel material positioned with a width determined on the tack welding line. Next, the upper C-type steel material is lowered by the suspension device and brought close to the lower C-type steel material, so that the free end portions of both C-type steel materials are abutted (contacted) from above and below, and a pair of C-type steel materials are brought together. It can be made into the square-shaped steel pipe which piled up steel materials. The suspension device can then be completely removed and returned to its initial non-acting position.

  And the manufacturing equipment of the square steel pipe according to claim 3 of the present invention is the configuration according to claim 1 or 2, wherein the outer surface straightening device includes the outer surface of both C-type steel members in the inner surface straightened state by the inner surface straightening device. A detection unit for detecting a positional shift in the width direction is provided, and when the detection unit detects good, the tack welding machine is operated for welding, and when a defect is detected, at least one of the inner surface correction device and the outer surface correction device is It is characterized by being configured to be pressurized.

  Therefore, according to the invention of claim 3, the detector is in the non-detection state before the tack welding is performed, and the tack welding machine is retracted to the non-welding position. First, the right and left detectors are detected and actuated, and when the position deviation in the width direction of the outer surfaces of both C-type steel materials is detected within the allowable range in the inner positioning state by the inner surface correction device, the temporary welding machine is operated for welding. Then, tack welding is performed on the butt portion of the rectangular steel pipe. When at least one of the detection units detects a defect outside the allowable range, the inner surface correction device is operated again, and the inner pressure body is brought into stronger contact with the inner surfaces of the upper and lower C-type steel materials to perform pressure correction. Then, the detection is performed again, and when the detection unit detects good, the tack welding machine is operated for welding. When the detection unit detects a defect again, the external surface is uneven and the external surface correction device is operated to pressurize the upper portion of the rectangular steel pipe from the outside, and pressurize the top and bottom of the butted portion from the outside. Thereafter, detection is performed again, and when the detection unit detects good, the tack welding machine is operated for welding.

  Furthermore, the manufacturing equipment of the rectangular steel pipe according to claim 4 of the present invention is the configuration according to any one of claims 1 to 3, wherein the inner surface straightening device is located above and below the internal pressure body with respect to the main body. The working position and the vertical contact position of the upward support are configured to be adjustable.

  Therefore, according to the invention of claim 4, by adjusting the vertical action position of the inner pressurizing body and the vertical contact position of the upward support body, it is possible to cope with a rectangular steel pipe having a plurality of types of diameters (dimensions).

  According to the first aspect of the present invention described above, the front portion of the rectangular steel pipe whose width is determined by the width guide means is opposed to the outer surface straightening device of the tacking work section, and the inner pressure member is the front end of the rectangular steel pipe. The flat plate part bent at an acute angle (within 90 degrees) is pressure-corrected from the inside by bringing both inner pressure bodies into contact with the inner surface of the rectangular steel pipe in the state of facing the lower C-shaped It is possible to form a rectangular steel pipe in which the free end portions of the steel material and the upper C-type steel material are accurately butted from above and below. Then, the tack welding machine is operated to be welded, and the tack welding can be performed at the tip portion of the butt portion of the rectangular steel pipe. When the outer surface is uneven, the upper presser body of the outer surface straightening device is lowered and brought into contact with the upper surface of the rectangular steel pipe, so that the upper part of the rectangular steel pipe can be pressure corrected from the outside, and the side presser body By moving inward and contacting the flat plate portion, the flat plate portion can be pressure-corrected from the outside above and below the abutting portion of the rectangular steel pipe, and then the temporary welding machine can be operated for welding.

  Therefore, even if the bending is unstable and the right-angled bent portion is bent at an obtuse angle (90 degrees or more) or an acute angle (within 90 degrees), the free end portion is accurately abutted from above and below, and tack welding is performed. A rectangular steel pipe can be obtained. At that time, by performing the pressure correction by the inner pressure body at a plurality of locations in the length direction (front-rear direction) of the rectangular steel pipe, it is possible to more accurately perform the matching of the free end portion by this pressure correction. It is possible to perform tack welding with higher accuracy.

  According to the second aspect of the present invention described above, after the pair of C-type steel materials that have been set are supplied onto the drive roller conveyor, the upper C-type steel material is lifted by the suspension device to the lower C-type steel material. Can be separated upward. Thus, in the state where the upper C-type steel material is lifted by the suspension device, the width of both C-type steel materials is determined by the width guide means, and the lower C-type is positioned and positioned on the tack welding line. The inner surface correction device can be moved into the steel. Next, the upper C-type steel material is lowered by the suspension device and brought close to the lower C-type steel material, so that the free end portions of both C-type steel materials can be butted (contacted) from above and below, and a pair of C-type steel materials It can be made into a square steel pipe made by stacking steel materials. The suspension device can then be completely removed and returned to its initial non-acting position.

  According to the third aspect of the present invention described above, before the tack welding is performed, the detection unit is in the non-detection state, and the tack welding machine is retracted to the non-welding position. First, the right and left detectors are detected and actuated, and when the position deviation in the width direction of the outer surfaces of both C-type steel materials is detected within the allowable range in the inner positioning state by the inner surface correction device, the temporary welding machine is operated for welding. Thus, tack welding can be performed on the butt portion of the rectangular steel pipe. Further, when at least one of the detection units detects a defect outside the allowable range, the inner surface correction device is operated again, and the inner pressure body is made to contact the inner surfaces of the upper and lower C-shaped steel materials more strongly to perform the pressure correction. If it is detected again and the detection part is good, the tack welding machine can be operated for welding. In addition, when the detection unit detects a defect again, the external surface is uneven and the external surface correction device is operated, so that the upper part of the rectangular steel pipe can be pressure-corrected from the outside, and the top and bottom of the abutting part can be pressure-corrected from the outside. When it detects again and a detection part is good detection, a tack welding machine can carry out welding operation.

  Further, according to the fourth aspect of the present invention described above, by adjusting the vertical action position of the inner pressurizing body and the vertical contact position of the upward support body, it is possible to cope with rectangular steel pipes of a plurality of types (diameters). .

FIG. 2 is a partially cutaway rear view of the main part of the tacking work section of the production facility for a rectangular steel pipe, showing Embodiment 1 of the present invention. It is the manufacturing equipment of the same square steel pipe, (a) is a top view, (b) is a side view. It is a vertical rear view of the same width guide means part. It is a side view of the principal part of the hanging device part. It is a partially cutaway rear view of the tacking working part. It is a side view of the same tacking work part. It is a side view of the same inner surface correction apparatus. It is a top view of the same inner surface correction apparatus. It is a front view at the time of the integral movement of the same inner surface correction apparatus. It is a partially cutaway rear view at the time of another body correction device. It is a partially notched back view at the time of the inner surface correction of the same inner surface correction apparatus. It is a partially cutaway rear view at the time of the same detection. It is a schematic back view which shows the effect | action of the same width guide means. It is a schematic plan view which shows the effect | action of the same width guide means. It is a schematic back view which shows the effect | action of the correction and welding. It is explanatory drawing, such as a manufacturing process of the C-type steel material.

[Embodiment 1]
Embodiment 1 of the present invention will be described below with reference to the drawings.
First, the production of C-type steel will be described. That is, as shown in FIG. 16 (a), for example, the strip-shaped steel plate 1 having a thickness of 12 to 40 mm conveys the strip steel plate in the length direction, passes through the trimming groove processing machine, and opens on both side edges in the width direction W. The tip 2 is processed and formed by cutting to a predetermined length before and after this. Then, the steel plate 1 is put into a forming press device, and by raising and lowering the upper die with respect to the lower die, as shown in FIG. Alternatively, the right-angled bent portion (corner portion) 3 is formed. As a result, the C-shaped steel material 6 is formed in which the space between the right-angled bent portions 3 is a fixed-size flat plate portion 4 and a portion connected to the fixed-size flat plate portion 4 is a pair of half-sized flat plate portions 5.

  And as shown in FIG.16 (c), as for a pair of C type steel materials 6, the downward open upper C type steel materials 6B (C type steel materials) are engage | inserted by the downward open lower C type steel materials 6A (C type steel materials) ( 2 are supplied in parallel on a steel material supply base 11 disposed on the side of the upper portion of the tack welding line 21 as shown in FIG. In this case, the half-size flat plate portion 5 on the tack welding line 21 side in the upper C-shaped steel material 6B is fitted to the outside of the half-size flat plate portion 5 on the tack welding line 21 side in the lower C-type steel material 6A (temporary welding). It is performed in a state of being positioned on the line 21 side).

  As shown in FIGS. 2, 5, and 6, the tack welding line 21 is formed by a driving roller conveyor 22, where the driving roller conveyor 22 has a conveyor frame 23 and bearings at a plurality of locations of the conveyor frame 23. The feed roller 25 is rotatably provided via the section 24, and a roller driving device 26 interlocked with the feed roller 25. In two places (one place or a plurality of places) in the direction of the tack welding line 21, a supply side on which a reciprocating run can be performed synchronously from a side portion of the steel material supply base 11 to a front rear portion of the feed roller 25. A transfer carriage 12 is provided, and the supply-side transfer carriage 12 is provided with a receiving portion 13 that can be raised and lowered.

  Accordingly, the pair of C-type steel materials 6A and 6B set on the steel material supply base 11 are lifted by the raised receiving portion 13 via the lower C-type steel material 6A, and the supply-side transfer cart 12 travels forward. Thus, after being positioned above the group of feed rollers 25 of the drive roller conveyor 22, it is lowered onto the group of feed rollers 25 by the lowering of the receiving portion 13. Accordingly, the pair of C-shaped steel materials 6A and 6B on the steel material supply table 11 can be supplied onto the drive roller conveyor 22 by the supply side transfer carriage 12.

  As shown in FIGS. 2, 3, 13, and 14, the portion of the tack welding line 21 is a rectangular steel pipe 7 (described later) that is transported in the longitudinal direction on the tack welding line 21. ) Width guide means 31 is provided. That is, the width guide means 31 includes a group of stationary rollers 32 provided at a plurality of locations in the direction of the tack welding line 21 on the side opposite to the steel material supply base 11, and the direction of the tack welding line 21 on the steel material feed base 11 side. The movable roller 34 group is provided at a plurality of locations. Here, the stationary roller 32 is provided so as to be freely rotatable around the vertical axis with respect to the fixed support member 33 from the equipment frame 20 side. Further, at a position facing the fixed support member 33 across the tack welding line 21, a laterally movable member 35 that can swing laterally around the longitudinal axis with respect to the equipment frame 20, and this laterally movable member. A vertical movable member 36 that can stand up and down around the horizontal axis with respect to the member 35 is provided, and the movable roller 34 is provided on the vertical movable member 36 so as to be freely rotatable around the vertical axis when standing up. It has been.

  Then, as shown by the solid line in FIG. 3, FIGS. 13A and 14A, the vertically movable member 36 is turned sideways and the horizontally movable member 35 is swung laterally outward so that the horizontally movable member is moved sideways. The upper surface of the roller 34 is positioned outside the tack welding line 21 at the same level as the upper surface of the feed roller 25 of the drive roller conveyor 22, and is also an imaginary line in FIG. 3, an imaginary line in FIG. As shown by the solid line in (b), the vertically movable member 36 is erected, and as shown by the phantom lines in FIGS. 13 (b) and 14 (b), the horizontally movable member 35 is swung horizontally inward. Thus, the standing movable roller 34 is configured to approach the stationary roller 32 in the tack welding line 21. A swing drive device 37 for the laterally movable member 35 and an upright laterally tilting device 38 for the longitudinally movable member 36 are provided. Then, the supply of the pair of C-shaped steel materials 6A, 6B to the upper side of the feed roller 25 group of the driving roller conveyor 22 by the supply side transfer carriage 12 is shown by the solid line in FIG. 3, FIG. 13 (a). As shown, the half-size flat plate portion 5 of the upper C-shaped steel material 6B is configured to be in contact with the stationary roller 32. An example of the width guide means 31 is configured by the above 32 to 38 and the like.

  As shown in FIG. 2 to FIG. 4, only the upper C-type steel material 6 </ b> B is tack-welded out of the two C-type steel materials 6 </ b> A and 6 </ b> B that are set by fitting and positioned on the tack welding line 21. A suspending device 41 that moves up and down on the line 21 is provided. That is, a rail body 42 is provided on the upper part of the equipment frame 20 along the tack welding line 21, and a pair of movable members that are supported and guided by the rail body 42 and are movable in the direction along the tack welding line 21. The body 43 is provided, and these movable bodies 43 are configured to be able to approach and separate from each other by the mounted movement drive unit 44. Each movable body 43 is provided with an elevating member 46 that can be moved up and down by a mounted elevating drive unit 45, and a locking member 47 that protrudes in the opposite direction is provided at the lower end of these elevating members 46. .

  Therefore, as shown by the solid lines in FIGS. 2B and 4, the movable member 43 is moved away from each other, and then the elevating member 46 is lowered, so that as shown in the phantom line A in FIG. 47 is positioned at a lower level than the fixed-size flat plate portion 4 in the upper C-shaped steel material 6B, and both movable bodies 43 are moved closer to each other, as shown in phantom lines A in FIGS. The member 47 is plunged into the upper C-shaped steel material 6B and is opposed to the fixed-size flat plate portion 4 from below. Next, by raising the elevating member 46, as shown in FIG. 13 (a), the upper C-type steel material 6B can be lifted by engaging the locking member 47 with the fixed-size flat plate portion 4 from below. The flat plate portion 5 can be moved upward with respect to the lower C-shaped steel material 6 </ b> A while slidingly contacting the stationary roller 32.

  In this way, the width guide means 31 is operated in a state where the upper C-type steel material 6B is lifted by the suspension device 41, whereby the widths of both the C-type steel materials 6A and 6B are determined. That is, as indicated by the phantom line in FIG. 13A, the vertically movable member 36 is raised and the laterally movable member 35 is swung laterally inward to bring the raised movable roller 34 closer to the stationary roller 32. First, the movable roller 34 is brought into contact with the half-size flat plate portion 5 of the lower C-shaped steel material 6A, and the lower C-shaped steel material 6A is moved laterally toward the stationary roller 32 on the feed roller 25 group, and the lower C-shaped steel material 6A is moved. As shown in FIG. 13B, the half-sized flat plate portion 5 of the steel material 6A is brought into contact with the stationary roller 32 and the movable roller 34 is brought into contact with the half-sized flat plate portion 5 of the upper C-type steel material 6B. The widths of both C-type steel materials 6A and 6B are determined.

  Then, by lowering the elevating member 46, the upper C-type steel material 6B held via the locking member 47 can be lowered to approach the lower C-type steel material 6A, and at that time, the upper C-type steel material 6B The lowering is performed stably while sliding the half-sized flat plate portion 5 to the stationary roller 32 and the movable roller 34. Due to the lowering of the upper C type steel material 6B, when the groove 2 of the upper C type steel material 6B is sufficiently close to the groove 2 of the lower C type steel material 6A, the lowering of the upper C type steel material 6B is temporarily stopped. And the position shift between the front end surfaces of both C-type steel materials 6A and 6B is inspected. At this time, when a positional shift has occurred, correction is performed by moving both movable bodies 43 in the same direction.

  When the positional deviation does not occur or after correction, the upper C-type steel material 6B is lowered again, and the groove 2 portions (free end portions) of both the C-type steel materials 6A and 6B are brought into contact with each other from above and below. Thereby, as shown in FIG.13 (c), it can be set as the square-shaped steel pipe 7 which piled up a pair of C type steel materials 6A and 6B. In addition, the raising / lowering member 46 descend | falls in the state which the latching member 47 spaces apart with respect to the fixed size flat plate part 4 of 6 C of upper C-type steel materials. Thereafter, both the movable bodies 43 are moved away from each other to extract the locking member 47 from the rectangular steel pipe 7, and then the elevating member 46 is raised to bring the suspension device 41 to the initial position (state). Get back. The above 42 to 47 and the like constitute an example of the hanging device 41.

  As shown in FIGS. 1, 2, 5, 6, and 11, a tacking work unit 50 is provided in the tack welding line 21, and the tacking work unit 50 includes an outer surface correction device 51 and a tacking work unit 50. A tack welding machine 95 is provided. The outer surface correction device 51 includes a pair of left and right side pressers 55 that can be relatively approached and separated and an upper presser body 67 that can be moved up and down. That is, on both sides of the tack welding line 21, side lifting bodies 53 guided by guide portions 52 provided on the equipment frame body 20 side are provided, and side cylinder devices ( Side pressurization means) 54 is provided in the left-right direction (lateral direction orthogonal to the direction of the tack welding line 21), and the side presser 55 is provided on the inward piston rod.

  Further, an upper elevating body 61 guided by a guide portion 60 provided on the equipment frame body 20 side is provided above the tack welding line 21, and the upper elevating body 61 is connected to the equipment frame body 20 side. The cylinder device 62 is provided so that the vertical position can be adjusted. A plate-like holding body 63 is provided on the lower surface of the upper elevating body 61, and a left and right guide body 64 is provided on the lower surface side of the holding body 63. A pair of laterally movable bodies 65 that are freely movable is provided. Each of the laterally moving bodies 65 is provided with an upper cylinder device (upper pressure means) 66 in the vertical direction, and the upper presser body 67 is provided on a downward piston rod.

  Further, on the lower surface side of the holding body 63, a left and right shaft body 69 rotatably supported by a bearing body 68 is provided so as to penetrate the lateral movement body 65, and a nut that is screwed into the right screw portion 69a. The body 70 is provided on one lateral moving body 65, and the nut body 70 that is screwed into the left-hand thread portion 69 b is provided on the other lateral moving body 65. The shaft body 69 is rotated by a handle 71. By this rotation operation, the laterally moving body 65, that is, both upper pressers 67 are relatively moved toward and away from each other, and the rectangular steel pipe 7 corresponding to the type (product type) is moved. Can handle width changes.

  The raising and lowering of the upper elevating body 61 is controlled by detecting the upper surface of the rectangular steel pipe 7 by a height detector 72 provided on the side of the lateral moving body 65. Moreover, the raising / lowering of the side raising / lowering body 53 is automatically performed in conjunction with the raising / lowering of the upper raising / lowering body 61. In other words, on the upper portion of the side lifting body 53, a passive lifting body 56 (sprocket or the like) 56 is provided so as to be freely rotatable. One free end of a cord-like body (chain or the like) 57 hung on the ring body 56 from the lower side is connected to the equipment frame 20 side via the connecting tool 58, and the other free end is connected to the connecting tool 59. It is connected to the holding body 63 side via. A detector 73 for confirming the type (product type) by detecting a change in the upper surface (height) of the rectangular steel pipe 7 is provided at the center portion in the left-right direction on the guide portion 60 side.

  Therefore, the upper presser body 67 can be moved up and down through the holding body 63 and the like by raising and lowering the upper lift body 61 by the expansion and contraction of the cylinder device 62, and the upper presser body 67 is moved up and down via the cord-like body 57 and the like. Accordingly, the side presser body 55 can be moved up and down. Based on the detection of the detector 73, the upper elevating body 61 is lowered by the extension movement of the cylinder device 62, so that the upper presser body 67 can be opposed to the upper surface of the rectangular steel pipe 7. Next, the upper presser body 67 is lowered by the extension movement of the upper cylinder device 66 and brought into contact with the upper surface, so that the upper part of the rectangular steel pipe 7 can be pressure-corrected from the outside by the upper presser body 67. Further, the side presser body 55 opposed to the butting portion 7X of the rectangular steel pipe 7 is moved inward by the extension movement of the side cylinder device 54 and brought into contact with the side surface, so that the side presser body 55 has a rectangular shape. The half-size flat plate portion 5 can be pressure-corrected from the outside at the side of the steel pipe 7, that is, above and below the butted portion 7X. An example of the outer surface correction device 51 is configured by the above 52 to 73 and the like.

  The outer surface correction device 51 includes a detection unit 80 that detects a displacement in the width direction (left and right direction) of the outer surfaces of both C-type steel materials 6A and 6B in an inner positioning state by an inner surface correction device (described later) 100. Is provided. That is, an elevating frame portion 81 integrated with the side elevating body 53 is provided, and a moving frame portion 83 that is movable in the left-right direction by the operation of the cylinder device 82 provided on the elevating frame portion 81 side is provided. It has been. In the moving frame 83, a pair of upper and lower guide rods 84 connected to the rear side is supported and guided by a guide 85 provided on the side lifting body 53 side. An abutting body 86 is provided on the inner surface (front surface) of the moving frame 83, and the abutting body 86 is at the same level (height position) as the side pressing body 55, so It is possible to contact the outer surface of the half-size flat plate portion 5 in the vertical direction. A detector 87 is provided on the lower side surface of the moving frame portion 83, and this detector 87 is attached to the half-size flat plate portion 5 of the upper C-type steel material 6B by the operation of the cylinder device 88 provided in the moving frame portion 83. It is configured to be movable up and down over a position facing it and a position facing the half-size flat plate portion 5 of the lower C-shaped steel material 6A.

  Therefore, as shown in FIG. 11, the abutting body 86 is moved inward by the operation of the cylinder device 82 via the moving frame portion 83, and the front surface 86a is placed on the outer surface (both sides) The movement is stopped by contacting the outer surface or one outer surface. In this state, as shown by the dotted line in FIG. 11, the distance (dimension) to the outer surface of the half-size flat plate portion 5 is detected by the detector 87 facing the half-size flat plate portion 5 of the lower C-shaped steel material 6A. After that, as shown by the phantom line in FIG. 11, the detector 87 is raised by the operation of the cylinder device 88 so as to face the half-size flat plate portion 5 of the upper C-type steel material 6B, and to the outer surface of the half-size flat plate portion 5. The distance (dimension) is detected. In this case, the distance detection positions are, for example, two places displaced 20 to 30 mm up and down with respect to the center of the abutting portion 7X. For example, when a difference of 0.3 mm or more occurs in the detection values at both positions, the distance is poor. It is configured to be determined to be detected. When the detection unit 80 detects good, the tack welding machine 95 is operated for welding, and when defective is detected, at least one of the inner surface correction device 100 and the outer surface correction device 51 is pressurized (described later). It is configured. An example of the detection unit 80 is configured by the above 81-88 and the like.

  As shown in FIGS. 1, 2, 5 to 12, the feed roller 25 is disposed in the portion of the outer surface correction device 51, and the lower portion of the feed roller 25 and the detection unit 80 An upper surface regulating roller 91 whose length direction is the left-right direction is disposed. That is, an elevating body 92 that is guided to the equipment frame 20 side and that can be raised and lowered is provided, and its elevating drive unit 93 is provided on the equipment frame body 20 side, and the upper surface regulating roller 91 is idled on the elevating body 92. It is provided freely. Further, the robot-type tack welding machine 95 is provided between the outer surface straightening device 51 and the upper surface regulating roller 91. Here, the tack welding machine 95 is tack welding from the outside to the right and left abutting portions 7X. 8 is configured.

  An inner surface correction device 100 that is supported and guided by the inner surface of the lower C-shaped steel material 6A and is movable within the rectangular steel pipe 7 and that can be stopped at the portion of the tacking work section 50 is provided. That is, the main body 101 of the inner surface correction device 100 is a carriage type, and includes a lower main body portion 101A having idle wheels 102 on the front and rear, and an upper main body portion 101B whose vertical position can be adjusted with respect to the lower main body portion 101A. Composed.

  At the front end portion of the lower body 101A, a lower sliding body 104 that is movable and supported in the left-right direction by being supported and guided to the lower body 101A via a sliding contact guide 103, a sliding contact guide 105, and the like. An upper slide body 106 that is movable in the left-right direction by being supported and guided to the lower slide body 104 side via the is provided. A side guide roller 108 is provided at the front ends of the sliding bodies 104 and 106 so as to be freely rotatable via a longitudinal axis 107. Accordingly, the side guide rollers 108 can be fixed to the lower body portion 101A side by adjusting the position (guide width) by inserting the connecting body after sliding both the sliding bodies 104 and 106.

  Left and right guide rails 111 are respectively provided on the upper surface of the middle portion of the lower body 101A at two locations in the front-rear direction, and movable members 113 supported and guided by the guide rails 111 via the sliding contact members 112 are provided. It has been. Guide pins 114 are erected from both the left and right ends of both movable members 113, and spacers 115 are detachably fitted to the guide pins 114, respectively. A pair of left and right through holes 116 are formed in the front and rear end portions of the upper body portion 101B, and the upper body portion 101B is fitted around the guide pins 114 through the through holes 116. The upper body portion 101B is in contact with the spacer 115 to restrict the vertical position with respect to the lower body portion 101A. At this time, by selecting the spacer 115 having a different vertical height, the upper body portion 101B is moved upward and downward with respect to the lower body portion 101A. It is configured to be adjustable. An urging body (spring or the like) 117 is provided between the guide rail 111 side and the movable member 113 side so as to set the movable member 113 to an intermediate position in the left-right direction with respect to the lower body portion 101A. .

  The inner surface correction apparatus 100 is provided with a pair of left and right inner pressure bodies 118 that are relatively close to and away from each other at a plurality of locations in the front-rear direction of the main body 101. That is, a cylinder device 119 whose lateral direction is the expansion / contraction direction is provided at each of two positions in the front-rear direction of the upper body portion 101B. The cylinder device 119 includes a cylinder body 120 fixed to the upper body portion 101B and , Piston rod 121 and the like. A disc-shaped internal pressure member 118 is fixed to the closed end of the cylinder body 120 and the exposed end of the piston rod 121. A convex arc-shaped surface 118a is formed on the outer surface of the inner pressurizing body 118, and a recessed groove portion 118b in the front-rear direction is formed in the central portion in the vertical direction.

  Here, the recessed groove 118b is opposed to the abutting portion 7X of the rectangular steel pipe 7, and at that time, with respect to a diameter change (dimensional change) of the rectangular steel pipe 7, as described above, the vertical height Can be dealt with by selecting different spacers 115 and adjusting the vertical position of the upper main body 101B, that is, the vertical action position of the internal pressure member 118 with respect to the lower main body 101A. When the cylinder device 119 is extended, first, the piston rod 121 protrudes toward one side with respect to the cylinder body 120, and the convex arcuate surface 118a of the inner pressurizing body 118 comes into contact with the inner surface of the rectangular steel pipe 7. The cylinder main body 120 moves outward to the other side with respect to the piston rod 121 by the contact reaction force, and the convex arcuate surface 118a of the internal pressurizing body 118 can contact the inner surface of the rectangular steel pipe 7. At that time, the outer movement of the cylinder body 120 is smoothly performed by the movable member 113, that is, the upper body portion 101B moving against the urging body 117 with respect to the lower body portion 101A.

  On the rear part of the main body 101 in the inner surface straightening device 100, an upward support body 122 that can contact the downward inner surface of the upper C-type steel material 6B is provided. That is, a support frame 123 in the left-right direction is provided at the rear part of the lower main body 101A, and a pair of left and right locking holes 124 are formed in the support frame 123. The upward support body 122 has a rod shape, and a pair of left and right upward support bodies 122 is disposed by tightly engaging a small-diameter portion 122a below the engagement hole 124. A vertical cylinder device 125 is provided between the lower main body 101A and the support frame 123 in the left-right direction.

  Accordingly, as described above, when the upper C-type steel material 6B is lowered by the suspension device 41, when the portions of the groove 2 of both the C-type steel materials 6A and 6B are butted from above and below, The upper surfaces of both upward supports 122 can be opposed to each other. Then, the upper support 122 is lifted together with the support frame 123 by the cylinder device 125, and its upper surface is brought into contact with the lower inner surface of the upper C steel 6B, thereby stably supporting the upper C steel 6B. obtain. At that time, for the diameter change (dimensional change) of the rectangular steel pipe 7, the upward support 122 having a different vertical height is selected and attached to the support frame 123, and the vertical contact position by the upward support 122 is determined. It can be dealt with by adjusting. An example of the inner surface correction apparatus 100 is configured by the above 101-125 and the like.

  As shown in FIGS. 2, 7, and 8, the inner surface correction device 100 is placed at a standby position Y that is better than the steel material supply base 11 and an operation position Z that is a part of the tacking work unit 50. A driving means 130 is provided for reciprocating movement. That is, a rectangular tubular boom body 131 having a front end connected to the rear end of the lower body portion 101A is provided. The boom body 131 is long, and the integral movement with the lower body portion 101A is performed by the equipment frame body 20. This is stably performed by support guidance by the support roller 132 group and the side roller 133 group provided on the side. Near the standby position Y, on the equipment frame 20 side, a driving roller 134 is provided in a state of being pressed against the upper surface of the boom body 131, and a forward / reverse driving unit 135 linked to the driving roller 134 is provided. It has been. Various devices 136 including a tank are provided at the rear end of the boom body 131. These various devices 136 and the cylinder device 119 of the inner surface correction device 100 are connected by piping and wiring housed in the boom body 131. Yes.

  At the standby position Y, a standby section rail body 137 for supporting and guiding the idle wheel 102 is provided. A relay rail body 138 that supports and guides the idle wheel 102 is provided at a lower position adjacent to the standby position Y, and abuts the lower body portion 101A from below at the front and rear of the relay rail body 138. A flexible lifting roller 139 is provided.

  Therefore, the inner surface correction apparatus 100 is reciprocated between the standby position Y and the action position Z by driving the driving roller 134 forward and backward by the forward / reverse driving unit 135 to push and pull the boom body 131 in the length direction. Can move. At that time, after temporarily stopping the inner surface correction device 100 from the standby position Y on the relay rail body 138, the inner surface correction device 100 is raised by bringing the lifting roller 139 into contact with the lower body portion 101A from below. Thus, it is possible to cope with a change in the thickness of the fixed-size flat plate portion 4 in the rectangular steel pipe 7. An example of the driving unit 130 is configured by the above 131 to 139 and the like.

  The rectangular steel pipes 7 that have been tack welded 8 by the tacking work section 50 are discharged in parallel on a table 15 disposed on the side of the lower part of the tack welding line 21. That is, in two places (one place or a plurality of places) in the direction of the tack welding line 21, a payout that can freely reciprocate from the side portion of the table 15 to the front and rear portion of the feed roller 25. A side transfer carriage 16 is provided, and the payout side transfer carriage 16 is provided with a receiving portion 17 that can be raised and lowered. Therefore, the square steel pipe 7 that has been tack welded 8 on the group of feed rollers 25 of the drive roller conveyor 22 is lifted by the raised receiving portion 17, and the return side carriage 16 of the delivery side transfer carriage 16 travels backward. After being positioned above, the receiving portion 17 is lowered onto the table 15.

Hereinafter, the operation of the first embodiment will be described.
Before applying the tack welding 8, the inner surface correction device 100 is in the standby position Y as shown in FIG. 2, and the pair of left and right inner pressure members 118 are relatively moved closer by the contraction movement of the cylinder device 119. Yes. Further, the pair of left and right side guide rollers 108 are adjusted to a preferred position (guide width) with respect to the diameter change (dimension change) of the rectangular steel pipe 7 on which the tack welding 8 is to be applied, and fixed to the lower body portion 101A side. At the same time, the upward support body 122 having a preferable height with respect to the diameter change (size change) is attached to the support frame body 123. The suspension device 41 moves both movable bodies 43 away from each other and raises the elevating member 46.

  In the outer surface correction device 51, the upper lifting body 61 is lifted by the contraction movement of the cylinder device 62, so that the upper presser body 67 is lifted via the holding body 63 and the like, and the side body via the cord-like body 57 and the like. The part presser body 55 is raised. At that time, the upper presser body 67 is moved relatively closer to and away from the handle 71 by rotating the handle 71, and is brought into a preferred position with respect to a diameter change (dimensional change) of the rectangular steel pipe 7 on which the tack welding 8 is to be applied. And is raised by the contraction movement of the upper cylinder device 66. Further, the side pressing body 55 is moved outwardly by the contraction movement of the side cylinder device 54. Further, in the detection unit 80, the abutting body 86 is moved outward through the moving frame portion 83 by the contraction movement of the cylinder device 82, and the detector 87 is lowered by the extension movement of the cylinder device 88. Further, the upper surface regulating roller 91 is raised by the elevating drive unit 93, and the tack welding machine 95 is moved back to the non-welding position.

  In this state, first, a pair of C-type steel materials 6A and 6B which are set on the steel material supply base 11 are supplied onto the feed roller 25 group by the supply side transfer carriage 12, and in this case, as shown in FIG. As shown by the solid line, the half-size flat plate portion 5 of the upper C-shaped steel material 6B is brought into contact with the stationary roller 32. Next, the hanging device 41 is operated. That is, by lowering the elevating member 46 and moving the movable bodies 43 closer to each other, the locking member 47 is fixed to the upper C-type steel material 6B as shown by the solid line in FIG. 3 and the phantom line a in FIG. The small flat plate portion 4 is opposed to the lower portion. Then, by raising the elevating member 46, the upper C-type steel material 6B is lifted via the locking member 47, and as shown in FIG. 13, is separated upward from the lower C-type steel material 6A.

  Thus, before and after lifting the upper C-shaped steel material 6B by the suspending device 41, the movable roller 34 is moved as shown by the phantom line in FIG. 3, the solid line in FIG. 4 (b), and the phantom line in FIG. 13 (a). After standing, by approaching the stationary roller 32, as shown in FIG. 13 (b), the movable roller 34 and the stationary roller 32 make a half-size flat plate of the lower C-type steel material 6A and the upper C-type steel material 6B. The width of both C-type steel materials 6A and 6B is determined by sandwiching the portions 5 therebetween.

  As described above, the inner surface straightening device 100 at the standby position Y is moved into the lower C-shaped steel material 6A positioned with a width determined on the tack welding line 21. That is, by pushing and moving the boom body 131 in the length direction by the driving means 130, the inner surface correction device 100 can be moved forward while the idle wheel 102 is supported and guided by the standby section rail body 137. And when the plate | board thickness of the fixed-size flat plate part 4 in both C-type steel materials 6A and 6B is thin, and the upward inner surface (moving inner surface) of the lower fixed-size flat plate part 4 is a level similar to the relay rail body 138, The idle wheel 102 is supported and guided from the standby section rail body 137 to the upward inner surface via the relay rail body 138, and the inner surface correction device 100 is continuously moved forward.

  Moreover, when the plate | board thickness of the fixed-size flat plate part 4 in both C type steel materials 6A and 6B is thick and the upward inner surface of the low-order fixed-size flat plate part 4 is a level higher than the relay rail body 138, as shown in FIG. When the idle wheel 102 is positioned on the relay rail body 138, the forward movement is temporarily stopped. Then, the elevating roller 139 is raised and its circular upper surface is positioned above the relay rail body 138, and then the inner surface correction device 100 is moved forward again. Thus, the inner surface correction device 100 is supported and guided by the idler wheel 102 by the lifting roller 139 and then supported and guided by the upward inner surface, and enters the lower C-type steel material 6A, and the side guide roller 108 is guided by both inner surfaces. However, it can move forward in the lower C-shaped steel material 6A. This forward movement is stopped when the inner surface straightening device 100 reaches near the front end of the lower C-type steel material 6A.

  Next, by lowering the elevating member 46, the upper C-type steel material 6B can be lowered to approach the lower C-type steel material 6A, and the lowering of the upper C-type steel material 6B is temporarily stopped, and both the C-type steel materials 6A , 6B is inspected and corrected (adjusted in the length direction) for misalignment between the front end faces. Thereafter, by lowering the upper C-type steel material 6B again, as shown in FIG. 13C, the groove 2 portions of both the C-type steel materials 6A and 6B are abutted (contacted) from above and below. Thus, a square steel pipe 7 in which a pair of C-type steel materials 6A and 6B are overlapped can be obtained. At this time, the downward inner surface of the upper C-type steel material 6B is approaching the upward support 122. Then, after pulling out the locking member 47 from the rectangular steel pipe 7, the lifting device 46 can be raised to return the suspension device 41 to the initial position.

  After completely detaching the suspension device 41 in this way, the inner surface correction device 100 is operated, and as shown in FIG. 9, the upward support 122 is brought into contact with the downward inner surface of the upper C-type steel material 6B, The inner pressure body 118 is brought into contact between the inner surfaces of the upper and lower C-shaped steel materials 6A and 6B. That is, by extending the cylinder device 125, both the upward supports 122 are brought into contact with the downward inner surface of the upper C-type steel material 6B, and the front end side of the upper C-type steel material 6B is slightly lifted, thereby The posture of the steel material 6B is stabilized. Further, by extending the cylinder device 119, first, the convex arc-shaped surface 118a of the inner pressurizing body 118 on the piston rod 121 side is brought into contact with the inner surface of the rectangular steel pipe 7, and the cylinder main body 120 is subjected to the contact reaction force. The convex arcuate surface 118 a of the inner pressurizing body 118 on the side is brought into contact with the inner surface of the rectangular steel pipe 7. Thereby, the rectangular steel pipe 7 and the inner surface straightening device 100 can be integrated.

  In this state, by operating the driving roller conveyor 22 and the driving means 130, the rectangular steel pipe 7 is moved forward on the tack welding line 21, and the inner surface correction device 100 is moved in accordance with the integrated movement. Such movement is stopped when the front portion of the rectangular steel pipe 7 faces the outer surface correction device 51 of the tacking work unit 50. Then, by causing the cylinder device 125 to contract, as shown in FIG. 10, both the upward supports 122 are lowered and separated from the downward inner surface of the upper C-type steel material 6B, and thus the both C-type steel materials 6A and 6B A portion of the groove 2 is abutted from above and below to form a rectangular steel pipe 7. Further, by contracting the cylinder device 119, the inner pressure members 118 are separated from the inner surface of the rectangular steel pipe 7, so that the inner surface correction device 100 is separated from the rectangular steel pipe 7. In this state, only the driving means 130 is operated to move the inner surface straightening device 100 forward, and when the inner pressure member 118 faces the front end of the rectangular steel pipe 7, that is, as shown in FIG. The pressure body 118 is stopped when it faces the side presser body 55.

  Next, by extending the cylinder device 119, the convex arcuate surface 118a of the inner pressure members 118 is brought into contact with the inner surface of the rectangular steel pipe 7 as described above. As a result, as shown in FIG. 11, the half-sized flat plate portion 5 in which the right-angled bent portion 3 is bent at an acute angle (within 90 degrees) is pressure-corrected from the inside, and the groove 2 of the lower C-shaped steel material 6A is obtained. And the bottom surface of the groove 2 of the upper C-shaped steel material 6B can be made into a rectangular steel pipe 7 in which the upper and lower surfaces are accurately butted from above and below. Before and after this, the cylinder device 62 is extended based on the detection of the detector 73, the upper elevating body 61 is lowered, and the upper presser body 67 is brought close to and opposed to the upper surface of the rectangular steel pipe 7, and the cord-like body 57, etc. The side lift body 53 is lowered via the side portion, and the side presser body 55 and the contact body 86 are made to face the butted portion 7X of the rectangular steel pipe 7.

  Next, the left and right detection units 80 are operated to detect a positional shift in the width direction of the outer side surfaces of both the C-type steel materials 6A and 6B in the inner positioning state by the inner surface correction device 100. That is, the abutting body 86 is advanced by the extension operation of the cylinder device 82, and as shown in FIG. 12, the front surface 86a is placed on the outer surface (both outer surface or one outer surface) of the half-size flat plate portion 5 above and below the butting portion 7X. Abut on the side). In this state, as shown by the dotted line in FIG. 12, after detecting the distance (dimension) to the outer surface of the half-size flat plate part 5 of the lower C-shaped steel 6A by the detector 87, as shown by the phantom line in FIG. The detector 87 is raised so as to face the half-size flat plate portion 5 of the upper C-type steel material 6B, and the distance (dimension) to the outer surface of the half-size flat plate portion 5 is detected.

  Then, on both sides outward of the rectangular steel pipe 7, for example, the difference between the detected values at both the upper and lower positions is 0.3 mm or less, the step is within an allowable range, and the upper surface height of the rectangular steel pipe 7 is allowed by the detector 73. When it is detected that the value is within the range, the detection unit 80 determines that the detection is good and activates the tack welding machine 95 to perform the welding operation. The tack welding 8 by the tack welding machine 95 is performed only at the tip portion of the butt portion 7X of the rectangular steel pipe 7.

  In addition, when the difference between the detected values at both the upper and lower positions is 0.3 mm or more, for example, on both sides outward of the rectangular steel pipe 7, or when the upper surface height of the rectangular steel pipe 7 is outside the allowable range. The detection unit 80 determines that a defect has been detected. As a result, the inner surface correction device 100 is operated again, and the inner pressure member 118 is pressed more firmly between the inner surfaces of the upper and lower C-shaped steel materials 6A and 6B. Then, the distance (dimension) is detected again by the detector 87, and when the step or the upper surface height is within the allowable range, the detection unit 80 determines that the detection is good and activates the temporary welding machine 95.

  Further, when the detection unit 80 determines that a defect has been detected for the second time, the outer surface is uneven and the outer surface correction device 51 is operated. That is, as shown in FIGS. 1 and 5, the upper presser body 67 is lowered by the extension movement of the upper cylinder device 66 and brought into contact with the upper surface of the rectangular steel pipe 7, so that the upper part of the rectangular steel pipe 7 is externally viewed. Can be pressure corrected. Then, the side presser 55 is moved inward by the extension movement of the side cylinder device 54 and brought into contact with the half-size flat plate portion 5, so that the half-size flat plate portion 5 is located above and below the butted portion 7 </ b> X of the rectangular steel pipe 7. When the distance (dimension) is detected again by the detector 87 while maintaining the pressure correction state from the outside, and the level difference and the upper surface height are within the allowable range, the detection unit 80 It judges that it is good detection, and the tack welding machine 95 is welded. Although the detection unit 80 hardly determines that the third time is defective detection, if it is determined that the defect is detected, the rectangular steel pipe 7 is removed from the temporary welding line 21.

  As described above, after performing the tack welding 8 only at the tip portion of the abutting portion 7X by the tack welding machine 95, as shown in FIG. The pressure body 118 is separated from the inner surfaces of the C-type steel materials 6A and 6B, the outer surface correction device 51 is reversely operated to separate the side pressing body 55 and the upper pressing body 67 from the outer surface of the rectangular steel pipe 7, and The detection unit 80 is reversely operated to separate the contact body 86 from the outer surface of the half-size flat plate unit 5. In this state, the rectangular steel pipe 7 is advanced by a set distance on the tack welding line 21 by feeding and operating the driving roller conveyor 22 and the upper surface regulating roller 91 which is lowered and brought into contact with the upper surface of the rectangular steel pipe 7. At this time, the inner surface correction device 100 is in a stopped state at a position facing the outer surface correction device 51.

  Then, after the square steel pipe 7 is moved forward by a set distance and stopped, as described above, the inner surface correction device 100 is operated, and the detection unit 80 determines whether the detection is good or defective, and FIG. As shown in b), the external surface correction device 51 is also operated, and the detection unit 80 determines whether the detection is good or defective. Further, the welding operation by the tack welding machine 95 based on the good detection is performed by moving a set distance between the home position of the tack welding machine 95 and the above-described tack welding 8 at the tip portion. .

  Repeating the above operation, the tack welding 8 for a set distance is performed a plurality of times while pressurizing the square steel pipe 7 from the inside or the inside or outside, so that the total length of the butted portion 7X in the square steel pipe 7 is increased. As shown in FIG. 15 (c), the tack welding 8 can be applied by the tack welding machine 95.

  Therefore, even when the bending is unstable and the right-angled bent portion 3 is bent at an obtuse angle (90 degrees or more) or an acute angle (within 90 degrees), the groove 2 portion (free end portion) is moved up and down. From the above, a rectangular steel pipe 7 can be obtained which is accurately butted and tack welded 8. At that time, the pressure correction by the inner pressure body 118 is performed at two places (a plurality of positions) in the length direction (front-rear direction) of the rectangular steel pipe 7, so that the groove 2 portion (play) by this pressure correction is performed. The end portion) can be more accurately matched, and the tack welding 8 with higher accuracy can be performed.

  After performing the tack welding 8 over the entire length of the rectangular steel pipe 7 in this way, the outer surface correction device 51 is reversely operated to separate the side pressing body 55 and the upper pressing body 67 from the outer surface of the rectangular steel pipe 7. At the same time, the left and right detection units 80 are reversely operated to separate the contact body 86 from the outer side surface of the half-size flat plate unit 5, and at this time, the inner surface correction device 100 is in the pressure correction posture.

  In this state, the driving roller conveyor 22 and the driving means 130 are reversely operated, whereby the rectangular steel pipe 7 is moved backward on the tack welding line 21 and the inner surface correction device 100 is moved integrally. Such movement is temporarily stopped when the rear end of the rectangular steel pipe 7 approaches the lifting roller 139. Then, after the inner surface correction device 100 is reversely operated to separate the inner pressure member 118 from the inner surface of the rectangular steel pipe 7, the driving means 130 is reversely operated again, so that the inner surface correction device 100 is removed from the rectangular steel tube 7. It can be pulled out and moved from the relay rail body 138 to the standby section rail body 137 and returned to the standby position Y.

  Further, the rectangular steel pipe 7 from which the inner surface straightening device 100 has been pulled out moves forward on the tack welding line 21 by operating the drive roller conveyor 22, and after passing through the tack working section 50, tack welding is performed. Stop on line 21. Next, the rectangular steel pipe 7 subjected to the tack welding 8 is discharged in parallel on the placing table 15 by the discharging side transfer carriage 16 as shown in FIG. After that, the rectangular steel pipe 7 on the pedestal 15 is transferred to the inner surface welding machine and subjected to inner surface welding, and then transferred to the outer surface welding machine to perform outer surface welding so that the flat plate portion (two sides) is matched. A square steel pipe (product) having a welded portion (seam welded portion) can be manufactured.

  In the first embodiment described above, the upper C-type steel material 6B is positioned on the temporary welding line 21 in a state where the upper C-type steel material 6B is fitted into the lower C-type steel material 6A, and the upper C-type steel material 6B is suspended on the temporary welding line 21. Although the form which raises / lowers by the lowering apparatus 41 is shown, this is temporarily attached by a cart or a crane in a state where the portions of the groove 2 of both C-type steel materials 6A and 6B are abutted (contacted) from above and below. The form etc. which are carried in on the welding line 21 may be sufficient.

  In the first embodiment described above, a form in which the detection unit 80 is provided in the outer surface correction device 51 is shown, but this does not always detect misalignment, and is always between the inner surface correction device 100 and the outer surface correction device 51. It may be a type in which both are pressurized.

  In the first embodiment described above, as the inner surface correction device 100, the vertical action position of the internal pressurizing body 118 and the vertical contact position of the upward support body 122 can be adjusted with respect to the main body 101, and a plurality of types of diameters (dimensions) can be adjusted. ), Which is a kind of diameter (dimensions) with the vertical action position of the internal pressurizing body 118 and the vertical contact position of the upward support 122 being fixed with respect to the main body 101. It may be a format that can only deal with.

In the first embodiment described above, the inner surface correction apparatus 100 is shown in a form that is moved forward and backward by the driving means 130, but this may be a self-propelled carriage type or the like.
In the first embodiment described above, a small-diameter and thin-walled square steel pipe (product) is manufactured. This is a large-diameter and thick-walled square steel pipe, a large-diameter and thin-walled square steel pipe, and a small-diameter and thick-walled square steel pipe. Or the like.

  In Embodiment 1 described above, a square-shaped rectangular steel pipe (rectangular steel pipe 7) is manufactured. This is a rectangular rectangular steel pipe (rectangular steel pipe) having a long horizontal direction or a rectangular shape having a long vertical direction. It is also possible to manufacture a rectangular steel pipe (square steel pipe).

1 Steel plate 2 Groove (free end part)
3 Right angle bend (corner)
4 Flat plate part 5 Half flat plate part 6 C type steel 6A Lower C type steel (C type steel)
6B Upper C-type steel (C-type steel)
7 square steel pipe 7X butt portion 8 tack welding 11 steel material supply stand 12 supply side transfer carriage 15 placing stand 16 delivery side transfer carriage 20 equipment frame 21 tack welding line 22 drive roller conveyor 25 feed roller 26 roller drive device 31 Width guide means 32 Fixed roller 34 Movable roller 41 Suspension device 43 Movable body 46 Elevating member 47 Locking member 50 Temporary work part 51 External surface correction device 52 Guide part 53 Side elevating body 54 Side cylinder device (side addition Pressure means)
55 Side pressing body 57 Cord-like body 61 Upper lifting body 62 Cylinder device 66 Upper cylinder device (upper pressure means)
67 Upper presser body 72 Height detector 73 Detector 80 Detector 81 Lifting frame portion 82 Cylinder device 86 Abutting body 87 Detector 88 Cylinder device 91 Upper surface regulating roller 95 Tack welding machine 100 Inner surface correction device 101 Main body 101A Lower body Part 101B Upper body part 102 Free wheel 108 Side guide roller 111 Guide rail 112 Sliding member 113 Movable member 114 Guide pin 115 Spacer 116 Through hole 117 Energizing body 118 Internal pressure body 119 Cylinder device 120 Cylinder body 121 Piston rod 122 Upward support body 125 Cylinder device 130 Drive means 131 Boom body 134 Drive roller 135 Forward / reverse drive section 137 Standby section rail body 138 Relay rail body 139 Lift roller W Width direction Y Standby position Z Operation position

Claims (4)

  A pair of C-shaped steel members formed by bending two locations in the width direction at right angles to form a rectangular steel pipe by abutting the free end portions from above and below to form a square steel pipe, and then tack welding to the butted portion It is a production facility for a rectangular steel pipe to be constructed, and a temporary welding line is formed by a driving roller conveyor, and a width guide means for the rectangular steel pipe conveyed in the length direction on the temporary welding line is provided, A tacking work section is provided in the tack welding line, and the tacking work section is provided with an outer surface correction device and a tack welding machine. It consists of a free side presser and an upper presser that can be raised and lowered, and is supported and guided by the inner surface of the lower C-shaped steel material, and is provided with an inner surface correction device that can be stopped at the part of the temporary work part. The inner surface correction device is provided with a pair of left and right inner pressurizing members relatively close to and away from each other at a plurality of positions in the front-rear direction of the main body, and is capable of contacting the downward inner surface of the upper C-type steel material. An equipment for manufacturing a rectangular steel pipe, characterized in that an upward support is provided.   A pair of C-shaped steel members are positioned on the tack welding line in a state where the upper C-shaped steel member opened downward is fitted into the lower C-shaped steel member opened upward, and the upper C-shaped steel member is moved up and down on the tack welding line. A suspension device is provided, and the width of the C-type steel material is determined by the width guide means in a state where the upper C-type steel material is lifted by the suspension device. Manufacturing equipment for rectangular steel pipes according to 1.   The outer surface correction device is provided with a detection unit that detects a positional shift in the width direction of the outer surfaces of both C-type steel materials in the inner surface correction state by the inner surface correction device. 3. The manufacturing equipment for a rectangular steel pipe according to claim 1, wherein at least one of the inner surface correction device and the outer surface correction device is pressurized when a defect is detected. .   The inner surface correction device is configured such that the vertical action position of the inner pressure member and the vertical contact position of the upward support body are adjustable with respect to the main body. Manufacturing equipment for rectangular steel pipes as described in the paragraph.

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