JPH10128537A - Welding trolley equipped with an automatic drain hole detection device for standing plates - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide fillet welding of a lower plate and an upright plate,
Provided is a traveling carriage for welding provided with an automatic drain hole detection device for a standing plate, which can detect the drain hole when the standing plate has a drain hole and perform on / off control of a welding power supply circuit. SOLUTION: A horizontal plate bracket is fixed to a front part of a welding torch of a welding device provided on a welding traveling carriage, and a lever pivoted on a support shaft provided on the bracket with the support shaft as a fulcrum. One end of this lever protrudes from the bracket to the standing plate side, and a detection roller that contacts the standing plate surface and crosses the drain hole is attached to the end, and the lever is attached to the other end. Means for rotating the lever to constantly apply a force for pressing the detection roller against the upright surface, and further provided with a limit switch on the bracket which is turned on and off by turning the lever to turn on and off the welding power supply circuit. Features.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to, for example, a fillet weld between a lower plate and a standing plate, in which a drain hole is formed in the standing plate.
The present invention relates to a traveling bogie for welding provided with an automatic drain hole detection device for standing plates, which can control the on / off of a welding power supply circuit by detecting the drain hole.

[0002]

2. Description of the Related Art In the field of shipbuilding, for example, as shown in FIG. 4, a panel 17 is placed on a surface plate 19, and a standing plate 18 called a longitudinal is vertically erected as a reinforcing material on the upper surface of the panel. The two corners formed between the upper surface of the panel 17 and both sides of the lower end of the standing plate 18 are welded by, for example, high-speed gas seal shield arc welding using two electrodes while running the welding torch 15 in the direction of the arrow. The hull is formed by forming a hull block and assembling this block.

In order to discharge oil, water, air and the like remaining in the block after assembling the block, as shown in FIGS. In some cases, a hole-shaped drain hole 18h is provided. The length L of this drain hole in the welding direction is a maximum of 3
In some cases, as shown in (c) and (d), when there is a drain hole that is an area a where a weld cannot be formed, in order to ensure smooth welding and reduce welding cost. Need to stop welding.

For this purpose, it is necessary to always accurately detect the drain hole of the standing plate under bad conditions such as fume and spatter during welding.
There is a method of detecting with a non-contact sensor such as magnetism,
With these detection methods, accurate detection is difficult, and the on / off control accuracy of the welding power supply circuit is reduced, so that it may not be possible to achieve smooth welding and reduction in welding cost. For this reason, conventionally, when fillet welding is performed on this type of panel 17 and a long plate (standing plate) 18 provided with a drain hole 18h, the position and size of the drain hole 18h are visually observed and manually operated. The welding power supply circuit was turned on and off.

[0005]

However, as described above, when the drain hole is visually observed at the time of welding and the on / off control of the welding power supply circuit is manually performed, not only the welding work becomes complicated but also the monitoring is performed. It is difficult to secure the accuracy stably, and it is inevitable that the welding operation will be performed in the drain hole portion, and that the work load will increase in the post-processing process after welding. In addition, when a plurality of standing plates are simultaneously welded to the panel, there is a problem that a plurality of operators are required, a welding operation cost is increased, and a welding cost is increased.

In order to solve the above problems, the present invention is provided with an automatic drain hole detection device for a standing plate which can automatically detect the drain hole of the standing plate and control the on / off of the welding power supply circuit. An object of the present invention is to provide a traveling carriage for welding.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a traveling vehicle for welding provided with a welding device for fillet-welding a lower plate and an upright plate, wherein a front portion of a welding torch of the welding device is provided. , A horizontal plate bracket is fixedly mounted, and a lever that pivots around the support shaft is attached to a support shaft provided on the bracket, and one end of this lever is protruded from the bracket toward the upright plate, Means for attaching a detection roller which contacts the upright surface and crosses the drain hole of the upright, and at the other end portion, means for applying a force for rotating the lever to constantly press the detection roller against the upright surface. A traveling switch for welding equipped with an automatic drain hole detection device for a vertical plate, wherein a limit switch for turning on and off the welding power supply circuit by turning the lever is provided on the bracket. The first departure To. According to a second aspect of the present invention, in the first aspect, the traveling carriage for welding provided with the automatic drain hole detection device for the upright plate, wherein the lever is provided with a striker that comes into contact with the limit switch by turning the lever. It is.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The welding carriage according to the present invention is provided with an automatic drain hole detecting device for a vertical plate, and a drain hole is provided in a vertical plate as a material to be welded during fillet welding. In this case, the drain hole is detected by a detection roller attached to a lever of the drain hole automatic detection device, and a limit switch is operated by turning the lever, and a welding power source is set according to the detected position and size of the drain hole. The feature is that the on / off control of the circuit can be performed automatically, simplifying welding work and increasing the number of welding heads, reducing the burden on welding workers and shortening welding work time. Is possible.

The detecting roller 3 used here needs to be arranged such that its detecting peripheral end can contact the upright surface serving as a fillet weld and cross the drain hole serving as a non-fillet weld. In this case, if the detection peripheral end of the detection roller is set to the lower plate surface side and its thickness is reduced, the detection accuracy can be made more reliable without being greatly affected by the shape of the drain hole. In this sense, it is preferable that the detection roller has a dish-like shape and the peripheral end on the large diameter side is the detection peripheral end.

The size of the detection roller can be determined according to the size of the drain hole. In general, the outer diameter of the maximum diameter portion is about 15 to 30 mm. When the limit switch is operated by rotating the lever, the lever itself may be brought into contact with the limit switch, or a striker may be provided on the lever so that the striker comes into contact with the limit switch by rotating the lever. You may.

An embodiment of a traveling carriage for welding according to the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an example of the structure of a drain hole automatic detection device used in the present invention. FIG. 1 (a) is a top view and FIG. 1 (b) is a side view.

In FIG. 1, reference numeral 1 denotes a bracket, which is attached to the front of the welding torch at the lower end of the welding torch attachment portion of the welding device. The bracket 1 is provided with a support shaft 2 on which a lever 11 is rotatably supported. One end of this lever is a bracket 1
A detection roller 3 for detecting a drain hole of an upright plate is rotatably supported on a support shaft 4 provided at the tip of the detection roller 3.

A pin 9 is provided at the other end of the lever 11.
The other end of the tension spring 7 whose one end is supported at 0 is supported. This tension spring is for always applying a force for pressing the detection roller 3 against the surface of the standing plate 18 via the lever 11. The striker 5 is attached between the rotation center of the lever 11 and the pin 9, and the bracket 1 is provided with a limit switch 6 having a plunger 14.

This limit switch is connected to a welding control circuit and has a switch function that operates via a plunger 14 that comes into contact with the striker 5 of the lever 11 to open and close (turn on and off) the welding power supply circuit. I have. The stopper 8 is attached to the stopper base 12 attached to the limit switch 6 on the bracket 1 so as to be adjustable with a nut 13. The contact (contact) condition between the striker 5 and the plunger 14 of the limit switch 6 is as follows.
This provides a structure that can be adjusted.

As shown in FIG. 2, the automatic drain hole detection device 26 for a standing plate constructed as described above is provided with a motor-driven traveling wheel 29 and is disposed on a portal traveling carriage 16 traveling on a rail 30 by welding. Installed in the device 32,
The bracket 1 is attached to the front of the welding torch 15 provided at the lower end portion of the welding head 31 (in the welding traveling direction) by horizontally fixing the bracket 1 to the upper surface of the panel 17.

At the time of welding, first, the welding head 31 of the welding device 32 is moved by the traverse motor 23 to the position of the standing plate or the longitudinal 18 temporarily welded to the panel 17, and then lowered by the elevating motor 22 to an arbitrary position. The lower surface of the vertical copying 20 is brought into contact with the surface of the panel 17 by its own weight, and the tip of the welding torch 15 is moved to the fillet welding position of the panel 17 and the longitudinal 18 by the horizontal copying 21.

At this time, the detection roller 3 attached to one end of the lever 11 of the automatic drain hole detection device 26 is pressed against the lower surface of the long 18, and the striker 5 attached to the lever 11 is connected to the plunger 14 of the limit switch 6. Away from the limit switch 6
F ".

Next, the operator sets the fillet welding operation to "start" by operating a button, and as shown in FIG. 4, the welding wire is passed through the conduit 25 from the wire feeder 24 to the welding torch 15 using two electrodes. , The portal carriage 16 is moved on the rail 30 as shown by the arrow, and the fillet welding of the panel 17 and the longitudinal 18 is performed.

When the fillet welding progresses and the detection roller 3 reaches the drain hole 18h of the longitudinal 18 and the detection roller 3 enters the drain hole, the lever 11 moves the support shaft 2 by the action of the tension spring 7. When the striker 5 contacts the plunger 14 of the limit switch 6, the striker 5 contacts the plunger 14, and the limit switch 6 is turned "ON" to turn off the welding power supply circuit and stop the fillet welding operation.

Since the gate-type traveling vehicle 16 is driven by a power supply circuit different from the fillet welding operation, the fillet welding operation is proceeding without stopping, and the detection roller 3 is moved to the drain hole 18h. , The detection roller 3 moves from the edge of the drain hole to the surface of the longitudinal 18, and is pressed against the surface of the longitudinal 18 by the action of the tension spring 7.
1 rotates while pulling the tension spring 7 about the support shaft, the striker 5 separates from the plunger 14 of the limit switch 6, the limit switch 6 operates "OFF", the welding power supply circuit is turned "ON", and the fillet is filled. The welding operation restarts.

Here, the example in which the lever 11 rotates around the support shaft 2 has been described. However, the tension spring 7 can be changed by changing the attachment position of the spring or the limit switch, and the compression spring, the spiral spring, or the magnet can be used. The same effect can be obtained as in the above-described example because the detection roller is always pressed against the longe 18 by changing to the above.

FIG. 3 shows the above embodiment of the present invention.
FIG. 4 is a block diagram showing a control circuit for turning on and off a welding power supply circuit for controlling a fillet welding operation by the drain hole automatic detection device 26.
If the drain hole 18h is not detected, the limit switch 6 does not operate, and the welding power supply circuit is in the "ON" state. Is detected, the limit switch 6 is operated, and the output signal of the detection is input to the ON / OFF control device 28 of the welding power supply circuit via the delay circuit 27, and the welding power supply circuit is turned off. The fillet welding operation stops.

At this time, the traveling vehicle is still traveling, and the detecting roller 3 of the automatic drain hole detecting device 26
8 through the drain hole 18h. During this passage, the detection roller 3 moves from the edge of the drain hole to the surface of the longitudinal 18, and is pressed against the surface of the longitudinal 18 by the action of the tension spring 7, and the lever 11 is moved around the support shaft 2 by the tension spring 7. The striker 5 is separated from the plunger 14 of the limit switch 6, the limit switch 6 is turned "OFF", and the output signal is sent to the on / off control device 28 of the welding power supply circuit via the delay circuit 27. Then, the welding power supply circuit is turned on and the fillet welding operation is restarted.

Since there is a structural gap between the detection roller 3 of the automatic drain hole detection device 26 and the welding torch 15, even if the detection roller 3 detects the drain hole of the longe 18 during fillet welding, Since no output signal is output from the delay circuit 27 for a certain period of time, the fillet welding operation proceeds during that time. However, by taking into account the welding speed and setting a delay time corresponding to this interval in the delay circuit 27, It is possible to control the start and end points of the remaining welding.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the example of the portal-type traveling trolley has been described. However, in other types of traveling trolleys, similarly, by installing the drain hole detection device, similarly, the fillet of the standing plate having the lower plate and the drain hole is provided. Welding is possible.
Further, in the above embodiment, fillet welding for forming a hull block in the field of shipbuilding has been described as an example, but the present invention is also applicable to fillet welding in a general structure. Also, an example has been described in which the side end surface of the standing plate (longitude) is vertically butted against the lower plate (panel) surface, and fillet welding is performed between the butted side end of the standing plate and the lower plate surface. , This standing surface,
The lower plate may be an inclined plate or a curved plate.
Here, for convenience, a plate with a drain hole is referred to as a standing plate, and a plate without a drain hole to which the standing plates are butted and fillet welded is referred to as a lower plate.

The structure of the traveling carriage for welding, the structure of the drain hole detection device, the mounting structure, the welding control structure, etc., depend on the welding object, welding means, welding conditions, the positional relationship between the standing plate and the lower plate, and the like. There is a change within a range that satisfies claim 1 or claim 2.

[0027]

According to the present invention, a drain hole in an upright plate of a material to be welded is detected by a detection roller of an automatic drain hole detecting device at the time of welding, and a welding power source is provided in accordance with the detected position and size of the drain hole. Circuit on / off control can be performed automatically, simplifying welding work and increasing the number of welding heads, thereby reducing the burden on welding workers and shortening welding work time.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a structural example of a drain hole automatic detection device according to an embodiment of the present invention, wherein FIG.
(B) is an explanatory side view of (a).

FIGS. 2A and 2B are explanatory views showing a structural example of a traveling carriage for welding according to the present invention, wherein FIG. 2A is a front explanatory view and FIG. 2B is a side explanatory view of FIG.

FIG. 3 is a block diagram of a main part of an ON / OFF control example of a welding power supply circuit for controlling a welding operation in the traveling carriage for welding of the present invention.

FIG. 4 is an explanatory view showing an example of fillet welding of a panel (lower plate) and a long (upright plate) forming a hull block at the time of shipbuilding, wherein (a) is a three-dimensional explanatory view, and (b) is (a). Side explanatory drawing of a figure.

FIG. 5 is an explanatory side view showing an example of the shape of a drain hole of a longitudinal (standing plate).

[Explanation of symbols]

 1: Bracket 2: Support shaft 3: Detection roller 4: Roller shaft 5: Striker 6: Limit switch 7: Tension spring 8: Stopper 9: Spring tension side pin 10: Spring fixed side pin 11: Lever 12: Stopper base 13: Nut 14: Plunger 15: Welding torch 16: Gate-type traveling trolley 17: Panel (lower plate) 18: Longi (standing plate) 18 h: Drain hole 19: Surface plate 20: Vertical copying 21: Left and right copying 22: Elevating motor 23 : Traversing motor 24: wire feeding device 25: conduit cable 26: drain hole automatic detection device 27: delay circuit 28: ON / OFF control device of welding power supply circuit 29: running wheel 30: rail 31: welding head 32: welding device

Claims (2)

[Claims] 1. A traveling carriage for welding provided with a welding device for fillet welding a lower plate and an upright plate, wherein a horizontal plate bracket is fixedly provided in front of a welding torch of the welding device and provided on the bracket. Attach a lever that pivots on this support shaft to the support shaft, and project one end of this lever from the bracket to the upright plate.The end contacts the upright surface and crosses the drain hole of the upright A means for applying a force to rotate the lever and constantly press the detection roller against the upright surface is connected to the other end of the welding roller, and the welding power supply is operated by the rotation of the lever. A traveling carriage for welding provided with a vertical plate drain hole automatic detection device, wherein a limit switch for turning on and off a circuit is provided on the bracket. 2. The traveling carriage for welding provided with an automatic drain hole detection device for a vertical plate according to claim 1, wherein the lever is provided with a striker which comes into contact with a limit switch by rotation of the lever.