JPH0929442A - Device for grounding automatic welder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the damaging of a work caused by rubbing with a grounding plate and to enable execution of a large quantity of welding at a time at high speed in high quality. SOLUTION: A grounding carriage 35 synchronously runnable with a work carriage 7 for carrying the work 1 is arranged at the downstream side of a welding device 10. A supporting frame 49 extended to the right and left direction is assembled in a shiftable state to the vertical direction and the work carrying line L direction on the grounding carriage 35. Plural clamping devices are provided in a shiftable state to the right and left direction in the supporting frame 49. A clamp lever for clamping a lounge material 3 of the work 1 is provided in the clamping device and the grounding plate connected with a grounding cable is fitted to the clamping surface at the tip part of the clamp lever.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grounding device of an automatic welding machine used for assembling and welding a single plate panel which is a basic constituent member such as a flat plate block of a hull and a steel deck of a bridge.

[0002]

2. Description of the Related Art For example, in the case of constructing a ship, there is a construction method in which a flat plate block which constitutes a hull uses a single plate panel obtained by welding a longe material to a panel material as a basic constituent member.

An example of an automatic welding machine for welding the panel material and the longe material to form a single plate panel for a hull flat plate block is shown in FIGS. A roller conveyor 5 for transferring a work, which has a large number of conveyor rollers 4 installed along a transfer line L of the work 1 which is a single-panel panel composed of the material 3.
And a rail 8 laid on one side of the roller conveyor 5.
A work carrier 7 which is placed on the work carrier 1 such that either one of the left and right width ends of the work 1 can be gripped and moved by a gripper 6, and an upstream end position of the work carrier line L. There is a configuration including a single plate panel assembling apparatus 9 arranged and a welding apparatus 10 arranged at a position on the work transfer line L downstream of the single plate panel assembling apparatus 9.

As shown in FIG. 12, the veneer panel assembling apparatus 9 includes a cylinder 17 for pressing the longe material 3 onto the upper surface of the panel material 2 by means of the roller 16, and a left and right side of the longe material 3 by means of the roller 18. Cylinder 19 which is clamped from above and restrained, and the lower end of the longe member 3 is attached to the panel member 2
A plurality of (five in FIG. 11) assembly units 21 each having a welding head 20 for temporary fillet welding (temporary stop) from the left and right are installed so as to straddle the work transfer carriage 7 and the roller conveyor 5. The structure is attached to the girder 13 portion of the portal frame 22 composed of the columns 12 and the girder 13 so that the position can be adjusted in the vertical direction and the horizontal direction.

As shown in FIGS. 11 and 13, the welding apparatus 10 has a plurality of (five in FIG. 11) welding units having twin-type welding heads 23 for main welding the longe material 3 to the panel material 2. 24 is an upper frame 15 of a gate-shaped frame 26 that is composed of a support 14 and an upper frame 15 that are installed so as to straddle the work transfer carriage 7 and the roller conveyor 5.
It is configured such that the position can be adjusted in the up and down direction and the left and right direction. Reference numeral 25 indicates a welding power source.

When a single plate panel is manufactured by using the above automatic welding machine, it is automatically carried out based on system data inputted in advance. In this case, first, after the work 1 conveyed from a longe material distributing device (not shown) is positioned in the width direction, when the work 1 is grasped by the grasping tool 6 of the work conveyer 7, the work conveyer 7 is moved. The work 1 is conveyed to the position of the single-panel assembly device 9 by being moved at a predetermined speed. Next, the vertical cylinder 17 and the horizontal cylinder 19 of the assembly unit 21 are extended to constrain the position of the longe material 3 on the panel material 2. In this state, the welding head 20 of the assembly unit 21 causes the longe material 3 to move into the panel material 2.
Is temporarily attached (temporarily stopped) to the upper surface of the. After that, when the work carrier 7 is moved at a predetermined speed and the work 1 reaches the position of the welding device 10,
The welding head 23 of the welding unit 24 performs main welding of the longe material 3 to the panel material 2. In addition, this main welding is
This is continuously performed while the work 1 is being conveyed by the movement of the work conveying carriage 7. Further, when the work 1 is being continuously conveyed, the succeeding portion is the single plate panel assembling device 9. It is sequentially tacked by the welding head 20.

In the above automatic welding machine, a grounding device 11 as shown in FIGS. 14 and 15 is conventionally used. That is, a beam 27 is fixedly arranged so as to extend in parallel with the conveyor roller 4 at a position between the conveyor rollers 4 of the roller conveyor 5, and the beam 27 is made of a copper plate which is vertically displaced by driving a motor 28. A ground plate 29 is attached to the assembly unit 21 and the welding unit 24 so that the position of the ground plate 29 can be adjusted in the left-right direction. The electric current is made to flow by contacting with.

[0008]

However, in the case of the conventional earthing device 11 used in the above-mentioned automatic welding machine, the earth plate 29 is attached to the lower surface of the work 1 while the work 1 is being transferred and is being main-welded. The work 1 may be scratched by rubbing the work 1 with the ground plate 29, and the contact surface of the work 1 with respect to the ground plate 29 moves. There is a problem that the conditions become unstable. Therefore, it is impossible to stably perform grounding with respect to a large capacity current, and there is a limit to performing a large amount of welding at a high speed and with high quality at one time.

In view of the above, according to the present invention, a large amount of current can be stably grounded without damaging the work, and a large amount of welding can be performed at high speed and with high quality. It is intended to provide a grounding device for an automatic welding machine.

[0010]

SUMMARY OF THE INVENTION According to the present invention, a work formed by temporarily attaching a longe material to a panel material is carried by a work carrying carriage, and the panel material is main-welded by a welding device. In addition to laying a traveling rail along the work transfer line in the automatic welding machine, an earth truck capable of traveling in the direction of the work conveyance line in synchronization with the work carriage is provided on the traveling rail. Placed on the earth trolley, a support frame extending in the left-right direction orthogonal to the traveling direction is assembled so as to be movable in the vertical direction and the work transfer line direction, and at the upstream end surface of the support frame in the work transfer line direction. A clamp device equipped with a clamp lever for clamping the longe material of the above work is adjustable in height so that it can be moved and adjusted in the left and right directions. The distal end clamping surface of the clamp lever, a structure fitted with ground plate connected to ground cables.

Therefore, after placing the earth carriage at the position downstream of the welding device and adjusting the position of the clamp device in accordance with the longe material of the work, the earth carriage is clamped by the clamp lever and the work of the earth carriage is performed. If it is moved in synchronism with the carrier truck, the earth plate will not rub the work during the main welding by the welding device, and stable earthing will be performed.

Further, by constructing the earth plate attached to the clamp lever so as to be swingable in the horizontal direction by the vertical pin, it is possible to cope with the change in the thickness of the longe material.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 10 show an embodiment of the present invention. In an automatic welding machine having the same structure as shown in FIGS. 11 to 13, the work transfer line L is located downstream of the welding device 10. The grounding device 30, which is a feature of the present invention, is arranged at the side position.

The earthing device 30 has the following structure. That is, as shown in FIGS. 2 to 5, the work transfer line L is provided at both left and right positions with the roller conveyor 5 interposed therebetween.
A pair of traveling rails 31 are laid in parallel with the left and right base frames 32, front and rear uprights 33 standing on the respective base frames 32, and front and rear left and right uprights 33.
From the beam 34 that connects the upper ends of the grounding carriage 35, which is assembled in a gate shape so as not to interfere with the work transporting carriage 7 and the roller conveyor 5, the traveling rail 31.
One drive sprocket 38 driven by a motor 37 and two driven sprockets 39 are provided at the upper and lower positions on the side of the base frame 32. Is fixed to the upstream end side of the traveling rail 31 and the other end is fixed to the downstream end side of the traveling rail 31.
8 and 39 are sequentially wound to form a loop, and the drive sprocket 38 is rotated by the drive of the motor 37 so that the chain 40 is pulled up by each sprocket 39, 38, 39. The earth platform 35 travels along a rail 31 within a certain range (for example, 40 m), and further, the ground platform 35 travels so that the traveling speed of the earth carriage 35 is synchronized with the moving speed of the work transfer carriage 7. The electric motor 37 is electrically synchronized with the moving motor of the work transfer carriage 7.

In the earth carriage 35, a scaffolding frame 4 extending in the left-right direction is provided at a position between the left and right uprights 33.
1, the left and right ends of the scaffolding frame 41 are connected to the rod ends of a lockup cylinder 42 suspended from a beam 34 connecting the front and rear uprights 33, and the scaffolding frame 42 is expanded and contracted by the lockup cylinder 42. 41 so that the rack 41 can be moved up and down, and one of the facing surface portions of the front and rear uprights 33 extends vertically.
3 and a pinion 4 that meshes with the rack 43
4 on the left and right ends of the scaffolding frame 41.
The pinion 44 is rotatably mounted on the rack 43 when the scaffolding frame 41 is moved up and down so that the scaffolding frame 41 can be stably moved up and down.

The bottom surface of the scaffold frame 41 is shown in FIG.
, The guide block 46 and the guide rail 47 are arranged along the front-rear direction which is the work transfer line L direction.
A support frame 49 extending in the left-right direction is suspended and supported via a linear guide mechanism 48 composed of and brackets 50 are extended to the left and right end portions of the scaffold frame 41 so as to reach the left and right end surface portions of the support frame 49. At the same time, the cylinders 51 and 52 are installed on both end surfaces of the support frame 49 so as to sandwich the bracket 50 from the front and rear of the work transfer line L.
The rod tips of the rods 1, 52 are connected to the bracket 50 via the tip fittings 53, and the supporting frames 49 convey the work through the linear guide mechanism 48 by the expansion and contraction operations of the cylinders 51, 52 in the opposite directions. It can be moved along the line L direction.

The support frame 49 has the structure shown in FIGS.
As shown in FIG. 0, a support plate 54 extending in the left-right direction is fixedly provided on the end face on the upstream side in the work transfer line L direction, and a pair of upper and lower guide rails 55 extending in the left-right direction and the guide rails 55 extending in the left-right direction are provided on the surface portion of the support plate 54. A plurality of (five in the figure) clamp devices 58 are equipped via a linear guide mechanism 57 including a guide block 56 that engages with the guide rail 55 so that each of them can be moved and adjusted in the left-right direction.

The clamp device 58 is shown in FIGS.
As shown in detail in FIG. 3, a base plate 59 for fixing the guide block 56 of the linear guide mechanism 57 is provided, a motor 60 is installed on the surface portion of the base plate 59, and an output shaft of the motor 60 is connected via a gear mechanism 61. The attached pinion 62 is projected to the back surface of the base plate 59, meshed with the rack 63 attached to the front surface of the support plate 54 and extending in the left-right direction, and the pinion 62 is rotated by the drive of the motor 60.
9 is movable in the left-right direction along the linear guide mechanism 57, and the encoder 64 is installed on the surface of the base plate 59, and the pinion 65 (see FIG. 10) attached to the input shaft of the encoder 64 is attached. The rack 64 is engaged with the rack 63 so that the movement amount of the base plate 59 can be detected by the encoder 64.

Further, on the surface of the base plate 59, a base plate 69 can be lifted and lowered through a linear guide mechanism 68 including a guide rail 66 extending in the vertical direction and a guide block 67 engaging with the guide rail 66. The tip of the rod (upper end) of the cylinder 71 installed vertically on the surface of the base plate 59 is connected to the bracket 70 that is provided and extends to one end of the base plate 69 in the left-right direction. The base plate 69 is arranged to be moved up and down along the linear guide mechanism 68. Further, an intermediate portion of a pair of clamp levers 73 is horizontally rotatable by a pivot 74 between two upper and lower holding plates 72 that are horizontally fixed and fixed to the surface of the base plate 69. And the clamp lever 73
A clamp cylinder 75 is interposed between the base ends of the clamp cylinder 73, and the distal end of the clamp lever 73 can be opened and closed with the pivot 74 as a fulcrum by the expansion and contraction operation of the clamp cylinder 75.
A ground plate made of a copper plate (contact type) having a shape such that the tip of the longe member 3 of the work 1 can be clamped from the left and right and the tip of the clamp lever 73 covers the tip clamping surface of the clamp lever 73. (Child) 77 is swingably mounted in the horizontal direction by a vertical pin 78, and the other end of a ground cable 76 having one end grounded is connected to the ground plate 77 so that the ground carriage 35 can be moved. is there.

2 and 3, reference numeral 79 indicates a cable bear.

In the case of producing a single plate panel composed of the panel material 2 and the longe material 3, the ground carriage 35 is previously positioned adjacent to the downstream side of the welding device 10, and the panel is assembled by the single plate panel assembling device 9. When the work 1 in which the longe material 3 is temporarily attached to the work 2 is conveyed to the position of the welding device 10, the conveyance of the work 1 is temporarily stopped.

In the above state, each clamp device 58
Is positioned, and the tip end of the longe material 3 is clamped by the clamp lever 73. In this case, first, the lock-up cylinder 42 shown in FIGS.
The support frame 49 is moved up and down integrally with the lifting and lowering of the scaffolding frame 41 by expanding and contracting the clamp device 5.
After adjusting the height of the clamp lever 73 of No. 8 to the longe material 3, the height of each clamp lever 73 is adjusted by moving the base plate 69 up and down along the linear guide mechanism 68 by the expansion and contraction operation of the cylinder 71. Make sure to fit the longi material 3 accurately. Next, the motor 60 of each clamp device 58
Is driven to rotate the pinion 62 meshed with the rack 63 on the support plate 54 side, so that the base plate 59 is moved in the left-right direction along the linear guide mechanism 57, so that the pitch of each longe member 3 can be adjusted. Clamp device 5
The right and left intervals of the clamp lever 73 of No. 8 are adjusted. At this time, an encoder 64 is attached to the rack 63.
Since the pinion 65 attached to the input shaft of is engaged, the movement amount of the base plate 59 can be detected by the encoder 64. Next, the contraction operation of the clamp cylinder 75 expands the distance between the tips of the clamp levers 73, and the cylinders 51 and 52 installed facing the side end surface of the support frame 49 are moved in opposite directions to each other in the required directions. Support frame 4 by expanding and contracting
9 along the linear guide mechanism 48 and the work transfer line L
To the upstream side of the clamp lever 73 so that the longe member 3 is positioned between the tip ends of the clamp levers 73, and then the clamp cylinder 75 is extended to clamp the longe member 3 from the left and right with the clamp lever 73. I will let you. As a result, the work 1 is in a state of being grounded via the ground cable 76 from the ground plate 77 attached to the clamp surface of the tip portion of the clamp lever 73. or,
At this time, since the earth plate 77 can be horizontally swung with the vertical pin 78 as a fulcrum, it can be displaced according to the thickness of the longe material 3 and can be firmly attached to the longe material 3. It should be noted that an operator should check the above-mentioned adjustments of the intervals between the respective clamp devices 58 in the left-right direction, the height adjustment of the clamp lever 73, the clamped state, etc. one by one from the top of the scaffold frame 41.

After the above-mentioned state, the work carriage 7 which has been stopped is moved, and in synchronization with this, the drive sprocket 38 provided on the base frame 32 of the earth carriage 35 is rotated by the motor 37. And chain 4 sprocket 39, 38, 39 is wound around
The ground carriage 35 is made to travel by pulling 0. As a result, the earthing during the main welding by the welding device 10 is stably performed. Therefore, it is possible to prevent the lower surface of the work piece 1 from being rubbed by the ground plate 29 during the main welding of the work piece 1, and thus it is possible to stably ground the large-capacity current.

In the above embodiment, the earth truck 3 is used.
The case where a mechanism for pulling the chain 40 by the sprocket is adopted to drive the vehicle 5 has been described.
May be driven by a motor, and in the embodiment, the automatic welding machine for assembling the single plate panel for the hull flat plate block has been described, but the automatic welding machine for assembling the single plate panel for the bridge steel deck It is needless to say that the above can be similarly implemented, and various changes can be made within the range not departing from the gist of the present invention.

[0026]

As described above, according to the earthing device of the automatic welding machine of the present invention, the earthing carriage is moved in synchronism with the work conveying carriage while the longe member of the work is clamped by the clamp lever of the clamp device. Since it can be done, even if the work moves, the work is not scratched by the ground plate and is not damaged, and the ground can be stably performed even with a large capacity current. A large amount of welding can be performed at a high speed and with high quality at the same time, and the ground plate attached to the clamp surface at the tip of the clamp lever can be horizontally swung by a vertical pin to make the ground plate swingable. It has an excellent effect that it can be displaced according to the thickness of the longe material and the ground plate can be surely brought into close contact with the longe material.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an automatic welding machine showing an embodiment of a grounding device of the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 2;

FIG. 4 is a view taken along the line IV-IV in FIG.

5 is an enlarged view of VV in FIG.

FIG. 6 is a front view of the clamp device showing a VI portion of FIG. 2 in an enlarged manner.

FIG. 7 is a plan view of FIG. 6;

FIG. 8 is a view on arrow VIII-VIII in FIG.

9 is a view taken along the line IX-IX in FIG.

10 is a view on arrow XX in FIG. 6. FIG.

FIG. 11 is a schematic perspective view showing an example of an automatic welding machine.

12 is a schematic diagram showing an assembly unit of a single-panel assembly device used in the automatic welding machine of FIG.

13 is a schematic view showing a welding unit of a welding device used in the automatic welding machine of FIG.

FIG. 14 is a side view showing an outline of a conventional grounding device.

FIG. 15 is a front view of FIG.

[Explanation of symbols]

 1 Work 2 Panel Material 3 Longge Material 7 Work Transfer Cart 9 Single Plate Panel Assembling Machine 10 Welding Machine 31 Traveling Rail 35 Ground Carriage 49 Support Frame 58 Clamping Device 73 Clamp Lever 76 Ground Cable 77 Ground Plate 78 Vertical Pin

Claims (2)

[Claims] 1. The above-mentioned work in an automatic welding machine, wherein a work obtained by temporarily attaching a longe material to a panel material is transferred by a work transfer carriage and a main welding of the longe material is performed on the panel material by a welding device. A rail for traveling is laid along the transportation line, and an earth carriage is mounted on the traveling rail so as to be able to travel in the direction of the work transportation line in synchronization with the work transportation vehicle. , A support frame extending in the left-right direction orthogonal to the traveling direction is movably assembled in the up-down direction and the work transfer line direction, and the longe material of the work is clamped at the upstream end surface of the support frame in the work transfer line direction. A clamp device for adjusting the height of the clamp lever is installed so that it can be moved and adjusted in the left and right directions. An earthing device for an automatic welding machine, characterized in that a grounding plate to which a grounding cable is connected is attached to the clamping surface of the section. 2. The earthing device for an automatic welding machine according to claim 1, wherein the earthing plate attached to the clamp lever is configured to be swingable in a horizontal direction by means of a vertical pin.