JP6376664B2 - Welding device using shuttle type backing member - Google Patents

Description

  The present invention relates to a welding apparatus in which a backing member is disposed on one side of the front and back of a material to be welded, and a welding line at a position where the backing member is located is welded from the other side with a welding torch.

  In welding of the welding line of the material to be welded, for example, a plate joint butt line, a backing member that is long in the direction in which the welding line extends is arranged and fixed on the back side of the welding line, and the welding line on the backing member is connected from the surface side of the welding target material Then, welding is performed while driving the welding torch along the weld line. This is general plate welding.

JP-A-6-312285

  In welding of a long welding line using a backing member, the equipment for fixing and supporting the welding target material and the equipment for fixing and supporting the backing member are complicated, and the equipment cost is high and a wide installation space is required. Further, in the welding of a conical workpiece, the diameter continuously changes in the direction of the weld line, so that it is difficult to completely back shield over the entire weld line.

  Patent Document 1 discloses plate welding with an inductor (electric coil) that preheats the leading end of the preceding steel plate and the leading end of the succeeding steel plate, which are used when welding the preceding steel plate and the succeeding steel plate produced by continuous operation. An apparatus is described. Patent Document 1 describes a carriage that moves along a butt line (welding line) on which the inductor and a grooved roller type rotary backing member are mounted. A welding torch is shown facing the rotary backing member, and this welding torch appears to move in the same direction in synchronism with the movement of the rotary backing member along the weld line.

  The rotary backing member contacts the steel plate at the joint where it becomes the weld line, but because it is a rotating roller, cooling is difficult or a complicated cooling structure is required, and it is easily damaged by welding heat and has a short life. It seems to be. In addition, it is difficult to pipe shield gas that shields the gas directly under the weld.

  The first object of the present invention is to provide a welding apparatus capable of welding welding lines of various lengths longer than that with one backing member, and in addition, welding including a backing member that can be easily cooled. The second object is to provide an apparatus, and in addition, a backing member with an easy gas shield that can be pressed and moved so as to be in close contact with a workpiece whose diameter continuously changes so that the effect of the back gas shield is optimal. It is a third object to provide a welding apparatus comprising:

(1) A weld line in which each part (1a, 1b) supporting each of both ends of the butt forming the weld line of the workpiece (W) which is the material to be welded is opened in the direction (x) perpendicular to the weld line. A workpiece support arm (1) extending in the extending direction, i.e. the welding direction (y);
A backing carriage (2) in a space below each of the parts (1a, 1b) of the work support arm (1) and capable of reciprocating in the welding direction (y);
The backing carriage (3a, 3b) through a resilient member (3a, 3b) having a repulsive force in the direction (z) of pushing the work (W) supported by the parts (1a, 1b) of the work support arm (1). Backing member (4) attached to 2);
A gas hose for supplying and draining the backing member (4), a drain hose and a gas hose for feeding shield gas;
Torch carriage support arm (5) equipped in parallel with the work support arm (1);
A torch cart (6) supported by the torch cart support arm (5) and capable of reciprocating in the welding direction (y);
A welding torch (7) that is supported by the torch carriage (6) and aims at a weld line of the workpiece (W) supported by the workpiece support arm (1); and
Synchronous drive means for synchronously driving the backing cart (2) and the torch cart (6) simultaneously at the same speed in the same direction so that the backing member (4) always faces the welding torch (7). 8);
The backing member (4) is a rectangular parallelepiped that is longer in the longitudinal direction (y), which is the direction (y) in which the weld line extends, than in the transverse direction (x), which is generally the direction perpendicular to the weld line. (x) has a groove (9) facing the weld line over the entire length in the longitudinal direction (y) in the center portion of (x), and has a shield gas outlet toward the inside of the groove (9). 9) Inside the side walls (4a, 4b) on both sides, there is a cooling water flow path that communicates with the water supply and drainage hoses. A welding apparatus using a shuttle type backing member.

  In addition, in order to facilitate understanding, in parentheses, the correspondence of the examples shown in the drawings and described later, or the symbols or corresponding matters of corresponding elements are added for reference. The same applies to the following.

  The backing member (4) is generally a rectangular parallelepiped that is longer in the longitudinal direction (y), which is the direction (y) in which the weld line extends, than the transverse direction (x), which is the direction orthogonal to the weld line. Since the length is shorter than the length of the wire, the conventional operation of attaching a plurality of backing members that are long or over the entire length of the welding line to the workpiece is not necessary. Since the backing member (4) can reciprocate along the weld line within the length range of the work support arm (1), it can be welded from short to long weld lines within the length range. High nature. Further, since it is not necessary to always flow the back shield gas over the entire weld line, the amount of gas used can be suppressed.

  Cooling water is supplied to and drained from the backing member (4) by the water supply and drainage hoses (5a, 5b), so overheating of the backing member (4) due to welding heat is suppressed and not damaged, so that the backing member (4 ) Long service life. Since the shielding gas is supplied from the gas hose to the backing member (4) and is ejected to the groove (9) facing the welding line, the hot back bead during welding is covered with the shielding gas and oxidation is prevented.

It is a front view which shows the outline | summary of one Example of the welding apparatus using the shuttle type | mold backing of this invention. The y direction in FIG. 1 is the direction in which the weld line extends, the x direction is the horizontal direction perpendicular to the weld line, and the z direction is the vertical direction. It is a right side surface of the welding apparatus shown in FIG. It is a front view which shows the workpiece | work support arm (1) and torch stand support arm (5) of the welding apparatus shown in FIG. 1, and the backing member (4) and the torch carriage (6) attached to them. It is a left view which shows the member which supports the workpiece | work support arm (1) of the welding apparatus shown in FIG. It is a right view which shows the member which supports the backing member (4) of the welding apparatus shown in FIG. It is a top view of the backing member (4) shown in FIG. It is a front view of the backing member (4) shown in FIG. It is a front view which shows the welding torch (7) etc. which were equipped in the torch cart (6) of FIG. It is a right view of the torch cart (6) shown in FIG.

  (2) The work support arm (1) has a generally rectangular tube shape, but the upward side is open in the longitudinal direction (y), and both edges of the opening of the upward side are the workpiece (W). The welding apparatus using the shuttle type backing member according to the above (1), which is a portion (1a, 1b) for supporting the.

  (3) The above-mentioned (2), in which the rail (27a, 27b) is provided inside the work support arm (1) having a rectangular tube shape, and the backing carriage (2) is supported by the rail (27a, 27b). The welding apparatus using the shuttle type backing member described in 1.

  (4) A lifting device (11) and a lifting platform (12) supported by the lifting device (11) are provided, and the work support arm (1) and the torch carriage support arm (5) are connected to the lifting platform (12). The welding apparatus using the shuttle type backing member according to the above (1), which is mounted on the machine.

  (5) The synchronous drive means (8) includes a first pair of spools (19a, 19b) provided at the front end portion and the rear end portion of the work support arm (1), and these spools are stretched endlessly. And a second pair of spools (21a, 21b) provided at the leading end and the rear end of the backing truck drive chain (24) to which the backing truck (2) is connected, and the torch truck support arm (5). ), The torch cart drive chain (25) stretched endlessly on these spools and connected to the torch cart (6), and the backing cart (2) and the torch cart (6) simultaneously in the same direction. Any one of the above (1) to (4), including drive means (18, 45, 23a, 20, 46, 23b, 22) for rotationally driving the first and second spools for synchronous driving at the same speed The welding apparatus using the shuttle type backing member described in 1.

  Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

  Referring to FIG. 1 showing the outline of the front of the welding apparatus of one embodiment of the present invention and FIG. 2 showing the outline of the right side thereof, the pedestal 10 placed on the floor of the welding yard has a hydraulic lifting device 11, The lifting platform 12 is supported by the hydraulic lifting device 11. When the workpiece W is cylindrical or elliptical, the height is adjusted by being driven in the vertical direction z corresponding to the length of the workpiece. On the back side of the hydraulic lifting device 12, there is a vertical guide column 13 (FIG. 2), to which a guide rail 14 is fixed in a vertical posture. The guide rail 14 is coupled with a copying shoe that can move in the vertical direction z but cannot move in the welding direction y and the lateral direction x orthogonal thereto. The copying shoe is integral with the lifting platform 12. That is, the lifting platform 12 can move up and down, but cannot move in the welding line direction y and the lateral direction x.

  An arm support column 15 for supporting the welding torch and an arm support column 16 for supporting the backing member stand vertically on the lifting platform 12. The arm support column 15 horizontally supports the torch support base arm 5 extending in the welding direction y, and the arm support column 16 horizontally supports the pipe-shaped auxiliary arm 17 extending in the welding direction y. The work support arm 1 is fixed to the auxiliary arm 17 in parallel with the auxiliary arm 17. That is, the work support arm 1 and the torch carriage support arm 5 extend in the direction y in which the weld line extends and are parallel to each other.

  In FIG. 3, the work support arm 1 and the torch cart support arm 5 shown in FIG. 1 are extracted and shown. Although details will be described later, a backing member 4 is mounted on the work support arm 1 so as to be able to reciprocate in the direction in which the arm 1 extends, that is, in the welding direction (direction in which the weld line extends) y (FIGS. 4 and 5). A torch cart 6 is attached to the torch cart support arm 5 so as to be capable of reciprocating in the welding direction y.

  Sprockets (chain gears) 19a and 19b are attached to the front and rear ends of the work support arm 1 so as to be rotatable about an axis extending in the lateral direction x, and a chain 24 is attached to both the sprockets 19a and 19b. It is stretched. One end of the chain 24 is connected to the front end of the backing cart 2, and the rear end is connected to the rear end of the backing cart 2. The chain 24 on the upper side of the spools 19 a and 19 b passes through the inner space of the work support arm 1, and the chain on the lower side passes through the inside of the pipe-shaped auxiliary arm 17. That is, the chain 24 is endlessly coupled to the sprockets 19a and 19b, and the backing carriage 2 moves forward through the chain 24 by the clockwise rotation of the sprockets 19a and 19b in FIG. That is, in FIG. 3, it moves from left to right.

  Sprockets 21a and 21b are attached to the front and rear ends of the torch carriage support arm 5 so as to be rotatable about an axis extending in the lateral direction x, and a chain 25 is stretched between the sprockets 21a and 21b. ing. One end of the chain 25 is connected to the front end of the torch cart 6, and the rear end is connected to the rear end of the torch cart 6. The chain 25 located above the spools 21a and 21b passes above the scanning rail 26 below the torch carriage 6 and below the movement space of the torch carriage 6 (FIG. 9), and below the spools 21a and 21b. The chain located on the side passes under the torch cart support arm 5. That is, the chain 25 is endlessly coupled to the sprockets 21a and 21b, and the torch cart 6 moves forward through the chain 25 by the clockwise rotation of the sprockets 21a and 21b in FIG. That is, in FIG. 3, it moves from left to right.

  An electric motor 22 with a speed reducer is provided at the rear end of the torch cart support arm 5, and two sprockets 23 a and 23 b are fixed to the output shaft thereof. One drive chain 45 is stretched endlessly on one sprocket 23a and the sprocket 18 coaxial with the sprocket 19b at the rear end of the workpiece support arm 1, and the other sprocket 23b and the above-described torch carriage support. Another drive chain 46 is stretched endlessly on the sprocket 20 coaxial with the sprocket 21b at the rear end of the arm 5.

  When the electric motor 8 with a speed reducer rotates forward and the output shaft rotates in the clockwise direction (upper side in FIG. 3), the sprocket 20 is driven to rotate clockwise through the sprocket 23b and the drive chain 46, and is coaxial with the sprocket 20. The chain 25 stretched around the sprocket 21b and the sprocket 21a at the tip of the torch cart support arm 5 moves clockwise, and the torch cart 6 moves from left to right in FIG. At this time, the sprocket 18 is rotated clockwise through the sprocket 23 a and the drive chain 45, and the chain 24 stretched around the sprocket 19 b coaxial with the sprocket 18 and the sprocket 19 b at the tip of the workpiece support arm 1. The backing truck 2 moves clockwise from the left to the right in FIG. 3 at the same speed as the moving speed of the torch truck 6. That is, the backing truck 2 moves synchronously in the same direction at the same speed as the torch truck 6. In this embodiment, the sprockets 18, 19a, 19b, 20, 21a, 21b, 23a, 23b, the endless chains 24, 25, the drive chains 45, 46, and the electric motor 22 with a reduction gear constitute the synchronous drive means 8. Yes.

  As shown in FIGS. 4 and 5, the work support arm 1 is roughly a quadrangular cylindrical shape, but the upward side is open in the longitudinal direction y, and both edges of the opening of the upward side are the workpieces. It is site | part 1a, 1b which supports W (FIG. 2), Comprising: Each of the butt | matching both ends which form the weld line of the workpiece | work W which is a welding object material is supported. That is, each part 1a, 1b which supports each of the butt | matching both ends which form the weld line of the workpiece | work W which is a welding object of the workpiece | work support arm (1) extended in the direction which weld line extends, ie, the welding direction y, is a weld line. And open in the width direction x orthogonal to. In this embodiment, a cylindrical butt welding from a cylindrical or elliptical cylindrical workpiece Wmax having a maximum diameter to a cylindrical or elliptical cylindrical workpiece Wmin, or a box-shaped butt welding which is a quadrangular cylinder. It is used for conical butt welding and flat plate butt welding.

  Rails 27a and 27b extending in the welding direction y are fixed to the bottom side of the work support arm 1, and the wheels of the backing truck 2 are on them. Four pins 28 a to 28 d penetrate the backing holder 29 in the vertical direction, and a lower end portion is fixed to the backing cart 2. The backing holder 29 is prevented from moving in the welding direction y and the lateral direction x by the pins 28a to 28d, but can move up and down in the vertical direction z. Compression coil springs 3a to 3d, which are cushion members, are inserted between the backing cart 2 and the backing holder 29, and the backing holder 29 moves upward with respect to the backing cart 2 by their repulsive force. Has been pushed away.

  The upper end portion of the backing member 4 is fixed to the backing holder 29 and protrudes upward from the opening between the portions 1a and 1b of the workpiece support arm 1 that support the workpiece W by the repulsive force of the compression coil springs 3a to 3d. However, when the workpiece W is supported below by the parts 1a and 1b, the backing member 4 is pushed downward by the workpiece W (FIG. 2), and the compression coil springs 3a to 3d are contracted. While the workpiece W is supported by the workpiece support arm 1, the backing member 4 is always in pressure contact with the workpiece W by the repulsive force of the compression coil springs 3a to 3d.

  6 and 7 show a plan view and a front view of the backing member 4. The backing member 4 is a rectangular parallelepiped shuttle type that is longer in the longitudinal direction y, which is the direction y in which the weld line extends, than the lateral direction x, which is generally the direction orthogonal to the weld line, and has a tip protruding in a bowl shape. Yes. The backing member 4 has a groove 9 facing the weld line over the entire length in the longitudinal direction y at the center in the lateral direction x, and has a concave cross section in the lateral direction. In the inside of the side wall portions 4a and 4b on both sides of the groove 9, there is a cooling water flow path communicating with a supply / drain hose (not shown).

  On the rear end face of the backing member 4, there are water supply and drainage ports 30a and 30b communicating with the cooling water flow path, to which the water supply and drainage hoses are connected, and there is a gas injection port 31 in which there is a gas hose ( (Not shown) are connected. The cooling water that has entered the water supply port 30a from the water supply hose reaches the drainage port 30b through the cooling water flow path of the side walls 4a and 4b and flows out to the drainage hose. The shield gas sent from the gas hose to the gas inlet 31 passes through the gas flow path below the bottom of the groove 9 and jets into the groove 9 from the gas outlet on the groove wall surface.

  8 and 9 show the front and right sides of the torch cart 6. A copying rail 26 is fixed to the torch cart support arm 5 and extends in the welding direction y. The side surface of the copying rail 26 is chevron (triangular apex shape), and copying wheels 32a to 32d whose circumferential surfaces are V-grooves are coupled to the chevron. Since the axles of these copying wheels are fixed to the torch carriage 6, the torch carriage 6 travels along the copying rail 26 when pulled by the chain 25.

  A torch support column 33 stands on the torch cart 6, and the torch support column 33 has an electric lifting mechanism 34, and a manual height adjustment mechanism 35 is supported by the mechanism 34. A torch holder 37 is supported by an elevating arm 36 of the height adjusting mechanism 35, and the welding torch 7 is supported by the torch holder 37 via an adjusting mechanism 38 in the width direction x position and torch posture. By means of the electric lifting mechanism 34 or the adjusting mechanism 38, the welding torch 7 has a posture and height aiming at the welding line from directly above the welding line (plate connecting line of the workpiece W) located directly above the groove 9 of the backing member 4. Set to A wire feeding device 39 draws and feeds the welding wire 41 from the welding wire coil 40 immediately below the tip of the welding torch 7 (FIG. 8). In FIG. 8, 42 is a welding power source, and 43 is a control box. A cable bear (registered trademark) 44 (FIG. 1) is connected to the welding power source 42.

1: Work support arm 1a, 1b: Parts that support the work
2: backing truck 3a-3d: compression coil spring (elastic member)
4: Backing member 4a, 4b: Side wall
5: Torch truck support arm 6: Torch truck support arm
7: Welding torch 8: Synchronous drive means
9: Groove 10: Pedestal
11: Hydraulic lifting device 12: Lifting platform
13: Vertical guide column 14: Guide rail
15: Arm support pillar (torch support) 16: Arm support pillar (backing member support)
17: Auxiliary arm 18, 19a, 19b, 20, 21a, 21b, 23a, 23b: Sprocket
22: Electric motor with reduction gear 24, 25: Chain
26: Copy rail 27a, 27b: Rail
28a-28d: Guide pin 29: Back
30a, 30b: Supply / drain 31: Gas inlet
32a to 32d: copying wheel 33: torch support pillar
34: Electric lifting mechanism 35: Manual height adjustment mechanism
36: Lift arm 37: Torch holder
38: Adjusting mechanism of width direction x position and seat posture
39: Wire feeder 40: Welding wire coil
41: Welding wire 42: Welding power source
43: Control box 44: Cable bear (registered trademark)
45: Drive chain 46: Drive chain

Claims (5)

Work support arms extending in the direction in which the weld line extends, i.e., in the welding direction, in which the respective portions that support the respective butt end portions forming the weld line of the workpiece to be welded open in a direction perpendicular to the weld line;
A backing carriage in a space below each part of the work support arm and capable of reciprocating in the welding direction;
A backing member attached to the backing cart via a resilient member having a repulsive force in the direction of pushing the workpiece supported by each part of the workpiece support arm;
Supply, drainage, drainage hose and gas hose for feeding shielding gas to the backing member;
A torch truck support arm equipped in parallel with the work support arm;
A torch cart supported by the torch cart support arm and capable of reciprocating in the welding direction;
A welding torch that is supported by the torch carriage and aims at a weld line of a work supported by the work support arm; and
Synchronous driving means for synchronously driving the backing cart and the torch cart at the same speed in the same direction at the same time so that the backing member always faces the welding torch;
The backing member is a rectangular parallelepiped that is longer in the vertical direction, which is the direction in which the weld line extends than the horizontal direction, which is generally perpendicular to the weld line. There is a groove facing the weld line, there is a shield gas outlet toward the inside of the groove, inside the side walls on both sides of the groove are cooling water passages communicating with the supply and drainage hoses, and an elastic member This is a shuttle type backing member that comes into close contact with the workpiece by a repulsive force in the direction in which the workpiece is pushed;   The work support arm has a substantially rectangular tube shape, and the upward side is open in the longitudinal direction, and both edges of the opening of the upward side are parts for supporting the work. The welding apparatus using the shuttle type backing member described in 1.   The welding apparatus using a shuttle type backing member according to claim 2, wherein a rail is provided inside the rectangular tube-shaped workpiece support arm, and the backing carriage is supported by the rail.   The welding apparatus using a shuttle type backing member according to claim 1, comprising a lifting device and a lifting platform supported by the lifting device, wherein the work support arm and the torch carriage support arm are mounted on the lifting platform. .   The synchronous drive means includes a first pair of spools provided at the front end portion and the rear end portion of the work support arm, and a back carriage drive chain in which the back carriage is connected endlessly to these spools. , A second pair of spools mounted on the front and rear ends of the torch cart support arm, a torch cart drive chain that is stretched endlessly on these spools and connected to the torch cart, and the backing The shuttle type rear surface according to any one of claims 1 to 4, comprising driving means for rotationally driving the first and second spools so as to synchronously drive the carriage and the torch carriage simultaneously in the same direction at the same speed. Welding equipment using this member.

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