JP3761776B2 - Welding equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a welding apparatus that includes two electrodes for one welding line, and a traveling apparatus that includes a welding apparatus that alternately energizes and welds the electrodes.
[0002]
[Prior art]
A traveling device having a welding torch is provided above the workpiece, and welding is performed while the traveling device is traveling. The traveling device is configured to press the front and back of the workpiece welding line with rollers. The roller is elastically supported by an air cylinder.
[0003]
There is a welding apparatus that includes two electrodes for one weld line, and alternately energizes and welds the electrodes.
[0004]
[Problems to be solved by the invention]
In order to improve productivity, it is strongly desired to increase the welding speed as well as automation. However, in a welding apparatus provided with two electrodes for one weld line and alternately energizing and welding the electrodes, the traveling apparatus vibrates during traveling, and welding failure is likely to occur. In particular, the vibration generated at the start is large, which is a major cause of poor welding. For this reason, the welding speed could not be increased.
[0005]
An object of the present invention is to increase the welding speed in an apparatus for welding by energizing two electrodes alternately.
[0006]
[Means for Solving the Problems]
The above-mentioned object has a welding head composed of a welding torch having two electrodes for one welding line and a restraining roller for holding a work, and a welding apparatus in which the welding head is suspended from a traveling device. The welding torch can be elastically supported, and the welding torch can be achieved by being selectively connected to the frame of the welding head or the restraining roller.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. The workpiece 1 is a long material, for example, an extruded shape of an aluminum alloy that constitutes the body of a railway vehicle. The length of the work 1 is the same as the length of the vehicle body. The workpiece 1 is fixed to the restraining jig 2 and butt-welded from the upper surface along the welding line 3 in the longitudinal direction of the workpiece 1. A portal-shaped traveling body 4 equipped with a plurality of welding heads 5 straddling the workpiece 1 travels on a traveling rail 6 provided in the longitudinal direction of the workpiece 1 to perform welding. The welding head 5 is provided with a sensor 7 for detecting the position of the groove, restraining rollers 8 and 9 for pressing the work 1 downward, and a welding torch 10.
[0008]
The sensor 7 detects the position of the groove and causes the welding head 5 to follow the groove position. The restraining rollers 8 and 9 are provided on the front and rear sides of the welding torch 10 in the traveling direction. Each of the restraining rollers 8 and 9 includes a plurality of rollers 15. At the end of the weld line, there is a tab 14 for supporting the restraining roller 8 and keeping the welding torch 10 at a predetermined height. A groove is provided in the center of the roller 15 of the restraining rollers 8 and 9 to prevent vibration caused by the restraining rollers 8 and 9 riding on the temporary bead 14 applied before welding for restraining and sizing. ing. Since the roller 15 is heated to a high temperature by arc heat during welding, the housing 17 that supports the roller 15 is water-cooled. Reference numeral 18 denotes a cooling water passage. The roller 15 and the housing 17 are made of a copper alloy having high heat conduction and high hardness.
[0009]
The restraining rollers 8 and 9 are suspended from the frame 5 </ b> A of the welding head 5 via the air cylinders 12 and 12. The restraining rollers 8 and 9 are also connected to linear guides 13 and 13 installed on the frame 5A. For this reason, the restraining rollers 8 and 9 move up and down linearly by the operation of the air cylinders 12 and 12. Further, the restraining rollers 8 and 9 can be slightly moved up and down by the air cylinders 12 and 12.
[0010]
The welding torch 10 is connected to the front restraining roller 8 via stays 11A and 11B. The welding torch 10 is installed on the frame 5A so that it can move up and down. When stays 11A and 11B are combined, they are L-shaped. For this reason, the welding torch 10 synchronizes with the raising and lowering of the restraining roller 8. The welding torch 10 is of a type that includes two electrodes for one welding line and welds the electrodes by energizing them alternately. The electrodes are before and after the welding direction.
[0011]
In such a configuration, when the welding lowers the restraining rollers 8,9 by the air cylinder 12, 12, obtain a workpiece 1 push of. Although the welding torch 10 tries to vibrate by the start of welding by the welding torch 10, the welding torch 10 is supported by the air cylinder 12 via the restraining roller 8, so that the vibration is absorbed or suppressed by the air cylinder 12. The Therefore, good welding can be performed at high speed.
[0012]
When the tab 13 is not provided, the following is performed. 5 to 7, the welding torch 10 is selectively connected to the frame 5A or the restraining roller 8 (stay 11A). That is, the connection part of the welding torch 10 is switched between the restraining roller 8 and the frame 5 </ b> A of the welding head 5. The welding torch 10 and the frame 5A are connected by providing a pin cylinder 20 on the stay 11B. The pin cylinder 20 is installed on the stay 11B. The tip of the rod of the pin cylinder 20 can enter the hole of the frame 5A. When the rod enters the hole of the frame 5A, the stay 11B cannot be moved up and down with respect to the frame 5A and is fixed.
[0013]
The welding torch 10 and the restraint roller 8 (stay 11A) are connected by providing a pin cylinder 19 on the stay 11B. The pin cylinder 19 is installed on the stay 11B. The tip of the rod of the pin cylinder 19 can enter the hole of the stay 11A. When the rod enters the hole of the stay 11A, the stay 11B and the stay 11A are integrated.
[0014]
In such a configuration, the rod of the pin cylinder 20 is retracted until just before welding is finished (until the front restraint roller 8 reaches a position corresponding to the tab 13, that is, until the restraint roller 8 reaches the end of the work 1). The rod of the pin cylinder 19 is protruded. As a result, the same state as in the embodiment of FIGS. The welding torch 5 is connected to the restraining roller 8.
[0015]
When welding progresses and the front restraint roller 8 is positioned immediately before the end of the workpiece, the rod of the pin cylinder 20 is protruded and the rod of the pin cylinder 19 is retracted. As a result, the welding torch 10 is connected to the frame 5A. For this reason, even if there is no work 1 (tab 13) under the front restraint roller 8, the welding torch 10 can maintain a predetermined position and can continue welding.
[0016]
The pin cylinders 20 and 19 both have two or more pins to prevent rotation about the pins due to the weight of the welding torch 10.
[0017]
【The invention's effect】
According to the present invention, in arc welding using a traveling automatic welding apparatus, good welding can be performed at high speed.
[Brief description of the drawings]
FIG. 1 is a side view of a welding head according to an embodiment of the present invention.
FIG. 2 is a perspective view near the end of a weld line.
3 is a longitudinal sectional view of a roller portion of the restraining roller in FIG. 1. FIG.
FIG. 4 is a perspective view of a welding apparatus provided with the embodiment of FIG.
FIG. 5 is a side view of a welding head according to another embodiment of the present invention.
6 is a right side view of FIG. 5. FIG.
7 is a cross-sectional view taken along the line VII-VII in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Work, 2 ... Restraint jig, 3 ... Welding line, 4 ... Traveling device, 5 ... Welding head, 7 ... Sensor, 8, 9 ... Restraint roller, 10 ... Welding torch, 11A, 11B ... Connection stay, 12 ... Air cylinder.

Claims (1)

In a welding apparatus having a welding head composed of a welding torch having two electrodes for one welding line and a restraining roller for holding a workpiece, the welding head is suspended from a traveling device.
Elastically supporting the welding torch ;
The welding torch is provided so as to be selectively connectable to a frame of the welding head or the restraining roller;
Welding device characterized by.

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