JP2016022487A - Shell welder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate stage replacement when a work-piece diameter changes while alleviating damage of the outer peripheral surface of a work-piece and the inner peripheral surface of a through hole.SOLUTION: Seven endless movement members 4 are arranged at seven points excluding the arrangement position of a welding torch 6 out of a work-piece the periphery equally divided in eight. After being transmitted from a drive gear 942 to the lowermost transmission gear 931, the rotation of a drive shaft 941 of a motor 94 is transmitted to another transmission gear 931 via a ring gear 95, and seven transmission gears 931 rotate in the same direction at the same speed. The rotation of each transmission gear 931 is transmitted to a ball screw 92 the rotation axis of which is in a radial direction of the work-piece 100 by a driving side bevel gear 93 and a driven side bevel gear 91. The seven endless movement members 4 move in a direction where they are separated from or close to one another, thereby enabling a chain 41 to come in the peripheral surface of the work-piece 100 in response to changes in the diameter of the work-piece 100.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tube welding apparatus for welding a butted portion of two end faces parallel to an axial direction in a workpiece obtained by bending a metal plate material into a cylindrical shape.

  When forming a cylindrical metal thin-walled tube, there is a method in which a metal plate material is bent into a substantially perfect circle and two end faces butted in the circumferential direction are welded. As a device used for welding two end faces parallel to the axial direction of a cylindrical workpiece, a pipe welding device including a die having a through hole through which the cylindrical workpiece passes has been proposed (for example, Patent Documents). 1).

  The pipe welding device exposes a welding tool to a part of the through hole in the axial direction and places the welding tool on the mold. While the workpiece passes through the through hole, the work abutting part is located at the welding position where the welding tool is placed. Weld. The inner diameter of the through hole is slightly reduced on the downstream side in the workpiece passing direction than on the upstream side. The welding position is disposed on the downstream side of the through hole.

An alignment guide blade is exposed in the through hole upstream of the welding position in the workpiece passing direction. The exposed position of the guide blade in the circumferential direction of the through hole coincides with the exposed position of the welding tool. The guide blade is fitted into the abutting portion of the workpiece to prevent the rotation of the workpiece in the through hole, and the welding portion of the workpiece is opposed to the welding tool over the entire length in the axial direction to prevent the welding line from being shifted in the workpiece.
Japanese Patent Publication No. 2-15310

  However, in the conventional pipe welding apparatus, when the work passes through the through hole of the mold, the outer peripheral surface of the work is liable to cause a linear scratch due to contact with the inner peripheral surface of the through hole. It tends to cause wear on the peripheral surface. For this reason, it is difficult to increase the passing speed of the work, and the shortening of the manufacturing time becomes insufficient. Such a problem occurs not only when manufacturing a cylindrical metal thin tube, but also when manufacturing an elliptical or rectangular tube-shaped metal thin tube. Also, the inner diameter of the through hole of the mold must be equal to the outer diameter of the workpiece, and it is necessary to replace the mold with through holes with different inner diameters according to the change in the outer diameter of the workpiece. It takes time.

  The object of the present invention is to reduce damage to the outer surface of the workpiece and wear of the moving path of the workpiece, to shorten the setup change time, and to increase the passing speed when the workpiece passes the welding position. An object of the present invention is to provide a pipe welding apparatus that can shorten the manufacturing time of a pipe.

  The present invention includes a plurality of endless moving members, welding tools, and moving mechanisms. Each of the plurality of endless moving members is movable along a circulation path including a straight portion, and each of the endless moving members abuts along the axial direction at a plurality of positions excluding the butted portion on the outer surface of the workpiece. The plurality of endless moving members are moving positions excluding the welding position corresponding to the position of the welding tool among the positions divided at equal intervals by adding 1 to the total number in the circumferential direction of the work, along the radial direction of the work And can be moved freely. The welding tool faces the butted portion within a range where the linear portion in the axial direction is located. The welding tool is supported movably along the radial direction at the welding position.

  The moving mechanism includes a plurality of ball screws, a plurality of fixing nuts, a plurality of driven bevel gears, a plurality of driving bevel gears, and a driving member. The plurality of ball screws are supported rotatably at positions corresponding to each of the plurality of moving positions with the longitudinal direction aligned with the radial direction. The plurality of fixing nuts are fixed to the plurality of endless moving members in a non-rotatable manner and screwed into the plurality of ball screws, respectively. The plurality of driven bevel gears are coaxially fixed to each of the plurality of ball screws. The plurality of drive-side bevel gears are arranged at positions corresponding to the plurality of movement positions, respectively, and screwed into the plurality of driven-side bevel gears. The driving member rotates a plurality of driving side bevel gears in the same direction at the same speed.

  In this configuration, a plurality of endless moving members are arranged in a straight line in the circulation path while a work in which a metal plate is formed in a cylindrical shape so that two end faces parallel to each other face each other is conveyed along the axial direction. The portion located in the portion abuts along the axial direction at a plurality of positions excluding the two end faces on the outer side surface of the workpiece, and moves along the circulation path as the workpiece moves. The workpiece is defined in the direction of movement by a plurality of endless moving members coming into contact with the outer peripheral surface, and the butted portions of the two end surfaces are welded by a welding tool while moving together with the plurality of endless moving members. Since a large speed difference does not occur between the outer peripheral surface of the workpiece and the plurality of endless moving members, damage to the outer peripheral surface of the workpiece and wear of the plurality of endless moving members are reduced.

  In the moving mechanism, when the drive member operates, each driven bevel gear rotates together with each ball screw at the same speed in the same direction via each drive bevel gear, and each fixing nut screwed to each ball screw is fixed. Each of the endless moving members thus moved moves away from and close to each other along the radial direction of the workpiece. Displacement of each endless moving member in accordance with a change in the outer diameter of the workpiece shortens the setup change.

  In this configuration, each of the plurality of endless moving members preferably includes an elastic body on the outer surface. Damage to the outer peripheral surface of the workpiece can be further reduced.

  According to the present invention, damage to the outer surface of the workpiece and wear of the workpiece movement path can be reduced, setup change can be shortened, and the passage speed when the workpiece passes through the welding position can be increased. The manufacturing time of the tube can be shortened.

It is side surface sectional drawing of the pipe welding apparatus which concerns on embodiment of this invention. It is a front view of the tube welding apparatus. It is a front view of the 1st support member with which the tube welding device is equipped. It is side surface sectional drawing of the pipe body welding apparatus which concerns on another embodiment of this invention. It is side surface sectional drawing of the pipe welding apparatus which concerns on another embodiment of this invention.

  Hereinafter, a pipe welding apparatus according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the tube welding apparatus 10 is configured to transfer the cylindrical workpiece 100 made of a metal plate material along the conveyance direction X parallel to the axial direction. The butted portion 110 is welded along the axial direction to manufacture a tubular body. The workpiece 100 is formed in a cylindrical shape in which a rectangular metal plate is bent in advance and two end faces parallel to each other are butted in the circumferential direction. The tube welding apparatus 10 includes an endless moving member 4, a guide blade 5, a welding torch 6, a first support member 7, a second support member 8, and a pressing member 9.

  The endless moving member 4 includes, as an example, a chain 41 stretched between a pair of sprockets 42 and 43, and the circumferential direction of the workpiece 100 is divided into eight equal parts in a plane orthogonal to the axial direction of the workpiece 100. Of the positions, they are arranged at seven places excluding the uppermost position. The chain 41 is stretched so as to be movable along a circulation path including a straight portion defined by the guide 44. The chain 41 can be stretched around three or more sprockets, and can be constituted by a belt or a plurality of rollers instead of the chain. The seven endless moving members 4 are supported by the first support member 7 so that the linear portions in the circulation path of the respective chains 41 abut against the outer peripheral surface of the workpiece 100.

  The guide blade 5 is a plate-like body with a lower end thickness reduced, and the longitudinal direction is set to the transport direction X within the range where the linear portion in the circulation path of the endless moving member 4 in the transport direction X is arranged. The second support member 8 is fixed in parallel. The guide blade 5 has a lower end portion fitted into the abutting portion 110 of the workpiece 100 from above, and prevents rotation of the workpiece 100 about its axis during conveyance.

  The pressing members 9 are disposed on both sides of the guide blade 5 in the circumferential direction of the workpiece 100 and abut on the circumferential surface of the workpiece 100 from above at a position upstream of the welding torch 6 in the transport direction X. Even after the rear end portion of the workpiece 100 passes through the guide blade 5, the butted portion of the workpiece 100 can be reliably aligned with the crater of the welding torch 6.

  The welding torch 6 is a welding tool of the present invention, and welds a butt portion in the workpiece 100. The welding torch 6 is fixed to the second support member 8 within the range of the straight line portion in the circulation path of the endless moving members 4A to 4G in the transport direction X and at a position downstream of the guide blade 5.

  The first support member 7 supports each of the seven endless moving members 4 such that each of the seven endless moving members 4 moves along the radial direction of the workpiece 100 (the normal direction of the outer surface). A pair of the first support members 7 are arranged on the base 71 via the attachment portion 72 so as to be symmetrical on the upstream side and the downstream side in the transport direction X.

  The second support member 8 supports the guide blade 5, the welding torch 6, and the pressing member 9. The center positions of the lower end portion of the guide blade 5 and the crater of the welding torch 6 coincide with each other in the horizontal direction in the plane orthogonal to the transport direction X.

  When the workpiece 100 is carried between the linear portions in the circulation path of the endless moving member 4 along the conveyance direction X, the lower end portion of the guide blade 5 is fitted into the abutting portion 110. While the workpiece 100 is being transported, the rotation of the workpiece 100 is restricted at a rotational position where the butt portion 110 faces the crater of the welding torch 6, and the butt portion 110 is welded by the welding torch 6.

  Each endless moving member 4 includes a plate 45, an adjustment plate 46, and an adjustment bolt 47 in addition to the chain 41, the sprockets 42 and 43, and the guide 44. The long plate-like plate 46 is arranged with its longitudinal direction parallel to the conveyance direction X, and holds the bearing 421 of the sprocket 42 and the bearing 431 of the sprocket 43 in each of the hole 451 and the long hole 452.

  The long hole 452 is formed along the longitudinal direction of the plate 45, and the shaft portion of the bearing 431 that is pivotally supported by the adjustment plate 46 is fitted therein. The bearing 431 supports the sprocket 43 so as to be movable along the longitudinal direction of the plate 45 within the range of the length of the long hole 452 of the plate 45.

  The adjustment bolt 47 is rotatably held by a holding portion 453 formed on the plate 45 and is screwed into a screw hole 461 of the adjustment plate 46. When the adjustment bolt 47 is rotated, the bearing 431 moves along the longitudinal direction of the plate 45 together with the adjustment plate 46 in the elongated hole 452, and the tension of the chain 41 is adjusted.

  The tubular body welding apparatus 10 moves the workpiece 100 along the axial direction within the range including the arrangement position of the welding torch 6 by the seven endless moving members 4. Since the chain 41 of each endless moving member 4 abuts on the circumferential surface of the workpiece 100 at a straight line portion in the circulation path, the movement speed of the workpiece 100 is the same as that of the workpiece 100 as the workpiece 100 moves along the conveyance direction X. Move along the circulation path.

  Since each chain 41 does not slide on the peripheral surface of the workpiece 100, damage on the peripheral surface of the workpiece 100 and wear of the chain 41 are suppressed. Thereby, compared with the conventional welding apparatus provided with the tunnel-shaped conveyance part, the welding speed can be increased about 3 times. In addition, the chain 41 can further reduce damage to the workpiece 100 by providing an elastic member such as rubber on the outer surface.

  Fixing nuts 454 are attached to both ends in the longitudinal direction of the plate 45 in a state where rotation is restricted. The fixing nut 454 is screwed with a ball screw 92 that fixes the driven bevel gear 91 coaxially.

  The ball screw 92 is supported by the support portion 73 of the first support member 7 so that the axial direction thereof coincides with the radial direction of the workpiece 100 and is rotatable. The support portion 73 is formed at a position corresponding to each of the arrangement positions of the seven endless moving members 4 in the first support member 7.

  The first support member 7 has a regular octagonal ring shape as an example, and corresponds to each of the arrangement positions of the seven endless moving members 4 in total on each side except the uppermost one side. The drive-side bevel gear 93 is rotatably supported by the shaft portion 932 of the fixing member 74 attached to the support portion 73 with the axial direction parallel to the transport direction X. The drive-side bevel gear 93 meshes with the driven-side bevel gear 91. A transmission gear 931 is coaxially fixed to the drive side bevel gear 93. The drive gear 942 fixed to the drive shaft 941 of the motor 94 meshes with the lowermost transmission gear 931 among the seven. Seven transmission gears 931 mesh with one ring gear 95 which is a drive member of the present invention. The ball screw 92, the fixing nut 454, the driven bevel gear 91, the drive bevel gear 93, and the ring gear 95 correspond to the moving mechanism of the present invention.

  The transmission gear 931 includes flange portions 9311 on both sides. The ring gear 95 is restricted from moving in the transport direction X by bringing the peripheral portions of both surfaces into contact with the flange portion 9311. The ring gear 95 can be rotatably supported while maintaining the state of meshing with the seven transmission gears 931 without interfering with the conveyance path of the workpiece 100.

  The drive member of the present invention is not limited to the ring gear 95, and is constituted by a belt or a chain on condition that the rotation of the drive gear 942 can be transmitted to the seven drive side bevel gears 93 in the same direction and at the same speed. You can also.

  By driving the motor 94, the rotation of the drive shaft 941 is transmitted from the lowermost transmission gear 931 to the other transmission gear 931 via the ring gear 95, and the seven transmission gears 931 include the seven drive-side bevel gears 93. At the same time, they are rotated in the same direction and at the same speed. The rotation of each drive-side bevel gear 93 is transmitted to the ball screw 92 by the driven-side bevel gear 91 with the rotation axis orthogonal. The rotation of the ball screw 92 is transmitted to the plate 46 as a moving force in the radial direction of the workpiece 100 by the fixing nut 463, and each endless moving member 4 moves along the radial direction of the workpiece 100.

  By driving the motor 94 according to the reduction or enlargement of the outer diameter of the workpiece 100, each of the seven endless moving members 4 can be brought close to or separated from each other by the same distance.

  The moving mechanism of the present invention comprising the ball screw 92, the fixing nut 454, the driven bevel gear 91, the driving bevel gear 93, and the ring gear 95 is an upstream side and a downstream side of the endless moving member 4 in the transport direction X. Therefore, the linear portion that constitutes the conveyance path of the workpiece 100 in the endless moving member 4 can be stably arranged.

  As shown in FIG. 3, the second support member 8 includes a support plate 81 and a movable plate 82 that are horizontally disposed. The support plate 81 is fixed to a horizontal portion at the upper end of the frame 72. A movable plate 82 is attached to the support plate 81 via a movable member 83. A guide blade 5 and a welding torch 6 are fixed to the movable plate 82.

  The movable member 83 includes an inclined cam 831, a slider 832, a guide 833, a screw screw 834, a support pin 835, a pressing spring 836, and an adjustment nut 837.

  The inclined cam 831 is fixed to the upper surface of the support plate 81, and the upper surface is constituted by an inclined surface. The lower surface of the slider 832 that is in contact with the upper surface of the inclined cam 831 is an inclined surface, and is disposed between the support plate 81 and the movable plate 82 so as to be movable. The guide 833 is fixed to the lower surface of the movable plate 82 and defines the moving direction of the slider 832. The screw screw 834 is screwed into a screw hole 821 extending downward from the lower surface of the movable plate 82, is disposed with the longitudinal direction horizontal, and one end is locked to the slider 832. The support pins 835 are arranged with their lower ends fixed at a plurality of positions on the upper surface of the support plate 81 and vertically arranged in the longitudinal direction, and are exposed to the upper surface of the movable plate 82 through the hole 822 of the movable plate 82. ing. The adjustment nut 837 is screwed into a screw portion formed at the upper end of the support pin 835. The pressing spring 836 is externally fitted to the support pin 835 between the adjustment nut 837 and the upper surface of the movable plate 82 and biases the movable plate 82 downward.

  When a rotational force is applied to the operation portion 8341 of the screw screw 834, the slider 832 moves in the horizontal direction according to the rotation direction, and the contact position of the lower surface of the slider 832 on the inclined surface of the inclined cam 831 is displaced, thereby supporting The movable plate 82 moves up and down with respect to the plate 81. The vertical position of the guide blade 5 and the welding torch 6 is adjusted together with the movable plate 8 according to the rotation direction and the rotation speed of the operation unit 8341. The second support member 8 supports the guide blade 5 and the welding torch 6 movably along the radial direction of the workpiece 100 (the normal direction of the outer surface). The positions of the guide blade 5 and the welding torch 6 in the radial direction of the workpiece 100 can be adjusted by the movement of the movable plate 82 in the second support member 8.

  With the above configuration, it is possible to easily cope with a change in the outer diameter of the workpiece 100, and the setup change is shortened.

  The configuration of the second support member 8 is not limited to that shown in FIG. For example, as shown in FIG. 4, the driven-side bevel gear 91 and the drive-side umbrella are also provided at the uppermost position of the work 100 divided into eight equally in the same manner as the other seven locations. The tooth gear 93, the transmission gear 931 and the ball screw 92 are arranged, and the guide blade 5 and the welding torch 6 can be supported on the support plate 181 provided with the fixing nut 463 in the same manner as the plate 46.

  In this case, the vertical position of the welding torch 6 can be adjusted independently according to changes in the material, plate thickness, etc. of the workpiece 100 by supporting the welding torch 6 up and down on the guide blade 5 within a predetermined range. It may be.

  Further, as shown in FIG. 5, with respect to the transport direction X, motors 94 are disposed on the upstream side and the downstream side, respectively, so that both ends of the seven endless moving members 4 can be operated separately. Also good. For example, while the workpiece 100 is transported along the transport direction X, the distance between the seven endless moving members 4 is gradually shortened so that the welding state of the butted portion 101 of the workpiece 100 is good. Can be.

  4 and 5, the same components as those shown in FIG. 1 are denoted by the same reference numerals and description thereof is omitted.

  The above embodiments are merely examples, and the present invention is not limited to these embodiments, and various modifications can be made within the scope of the present invention.

  For example, in the above embodiment, seven endless moving members 4 are arranged. However, the endless movement is performed on the condition that the workpiece 100 can be reliably conveyed while maintaining the state where the butted portion faces the welding torch. The number of members can be increased or decreased as appropriate. The endless moving member 4 is not limited to a chain, and a belt can be used.

4-endless moving member 6-welding torch 7-first supporting member 8-second supporting member 10-tube welding device 41-chain 42, 43-sprocket 72-frame 100-work 110-butting portion

Claims (3)

In the tube welding apparatus for forming a cylindrical shape by welding the butted portions of the two end faces while conveying the workpiece in a cylindrical shape so that the two end faces parallel to each other face each other along the axial direction,
A plurality of endless moving members each of which is movable along a circulation path including a straight portion, and each of which is in contact with a plurality of positions along the axial direction at the straight portion except for the two butted portions on the outer surface of the workpiece; The moving position excluding the welding position corresponding to the position of the welding tool among the positions divided at equal intervals by the number obtained by adding 1 to the plurality in the circumferential direction of the workpiece, along the radial direction of the workpiece. A plurality of endless moving members made movable;
A welding tool that faces the butted portion within a range in which the linear portion in the axial direction is located, and is a welding tool that is movable along the radial direction at the welding position;
A moving mechanism that moves each of the plurality of endless moving members by an equal distance along the radial direction,
The moving mechanism is configured to be non-rotatable to each of a plurality of ball screws rotatably supported with their longitudinal directions coinciding with the radial directions at positions corresponding to the moving positions, and the plurality of endless moving members. Corresponding to each of the plurality of moving positions, a plurality of fixing nuts fixedly screwed to each of the plurality of ball screws, a plurality of driven bevel gears coaxially fixed to each of the plurality of ball screws A plurality of drive-side bevel gears that are arranged at positions that are screwed into each of the plurality of driven-side bevel gears, and a drive member that rotates the plurality of drive-side bevel gears in the same direction at the same speed; , Including tube welding equipment.   The tube body welding device according to claim 1, wherein each of the plurality of endless moving members includes an elastic material on an outer surface.   The tube welding apparatus according to claim 1 or 2, wherein the moving mechanism is disposed at both ends of each of the plurality of endless moving members in the transport direction.

Images