JP2001009571A - Weaving device in automatic welding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a weaving device in an automatic welding machine, by which all position automatic welding can be applied to a welding member, by making the weaving device small and lightweight. SOLUTION: An air motor 2 for oscillating an output shaft at a given period and a given angle is used as a drive source of a weaving device, and a crankshaft 11 is attached to an output shaft 3 of the air motor 2. A weaving arm 10 fixed to a torch holder 5 holding a welding torch 4 is coupled to the crankshaft 11, and then the air motor 2 is actuated so as to oscillate the output shaft 3. By oscillation of the output shaft 3, the crankshaft 11 is reciprocated, so as to weave the weaving arm 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weaving device for a simple automatic welding machine with all positions.

[0002]

2. Description of the Related Art Conventionally, a simple automatic welding machine (hereinafter, referred to as an automatic welding machine) in which a torch holder is mounted on a bogie that travels along a welding line and a welding torch is gripped and welded to the torch holder. Is used. When performing welding by an automatic welding machine, the welding bead was dripping unstable in welding other than the downward welding posture. In order to stabilize the welding bead, weaving welding is performed in which the welding is performed while oscillating a welding torch.

[0003] In the weaving welding by an automatic welding machine, by welding while oscillating a welding torch, welding can proceed in a wavy manner in conjunction with the running of the automatic welding machine, and the welding bead can be stabilized. It is a welding method. However, the mechanism of the weaving device used for vertical automatic welding, horizontal automatic welding, or the like simply causes the welding torch to oscillate or oscillate vertically, and each mechanism uses an electric motor as a driving device.

[0004] The electric motor is provided with a gear speed reducer, and the weaving speed and the torque in response to changes in welding conditions are adjusted by the gear speed reduction ratio. As described above, since the configuration includes the electric motor and the speed reducer,
The conventional weaving device is a large, heavy, and expensive device. For this reason, automatic welding cannot be performed for all lines, and automation is not advanced for welding directions that require complicated control or welding directions that are difficult to support by an automatic welding machine.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to an automatic welding machine for reducing the size and weight of a weaving device.
It is an object of the present invention to obtain a weaving device capable of continuously performing welding in which welding conditions are sequentially changed in a welding direction of a steel plate member that is inclined and vertical from curved, and capable of performing automatic welding in all positions of a welding member. .

[0006]

Means for Solving the Problems An air motor is mounted on one end of a frame fixed to an automatic welding machine, a mounting bracket is fixed on the other end, and the air motor has a crankshaft offset from its output shaft. The shaft is connected to a key, the mounting bracket rotatably supports the support shaft, the support shaft supports a support hardware for fixing a torch holder holding the torch, and the weaving arm is fixed to the support hardware. The crankshaft was connected to the weaving arm in such a manner that movement in the front-rear direction was allowed and movement in the left-right direction was restricted.

Further, an elongated hole is provided in the longitudinal direction of the crank arm, and the crankshaft can be received in the elongated hole. Furthermore, large and small division chambers are formed by a rotatable division wall fixed to the output shaft, and an air motor having two air supply / discharge ports is used to periodically switch air between the large and small division chambers. The output shaft is periodically swung at a predetermined angle by supply and discharge. Furthermore, a shielding gas for welding is used as a working gas of the air motor, and an exhaust gas from the air motor is guided to a welding portion, and is reused as a shielding gas for welding.

[0008]

Embodiments of the present invention will be described below. FIG. 1 is a side view schematically showing a weaving device according to the present invention, and FIG. 2 is a bottom view of the same. In the figure, reference numeral 1 denotes a frame of a weaving device, which is fixedly supported by an automatic welding machine (not shown). 2 is frame 1
The output shaft 3 projects from a hole provided in the frame 1.

Reference numeral 4 denotes a welding torch, and 5 denotes a torch holder. The torch holder 5 is supported on a torch holder support shaft 7 via a torch holder support hardware 6. The torch holder support shaft 7 is rotatably supported by a mounting bracket 8 fixed to the frame 1 via a bearing. Reference numeral 9 denotes a welding wire. Reference numeral 10 denotes a weaving arm which is screwed to the torch holder support hardware 6 and is therefore integrated with the torch holder support hardware 6 and supported by the torch holder support shaft 7.

An elongated hole 12 is provided at an end of the weaving arm 10 in the longitudinal direction, and the crankshaft 11 is inserted and supported in the elongated hole 12 via a bearing. A shaft hole is formed in the boss portion of the crankshaft 11 so that the shaft center is shifted, and the boss portion is fitted to the output shaft 3 of the air motor 2 by a key.

Since the bearing of the crankshaft 11 is received in the elongated hole 12 of the weaving arm 10, the weaving arm 10 is allowed to move with respect to the crankshaft 11 in the front-rear direction (lateral direction in the drawing), Direction (Fig. 2
In the vertical direction) is restricted. The same effect can be obtained by providing a longitudinal guide on the weaving arm 10 instead of the elongated hole 12 so that the bearing of the crankshaft 11 can be received.

Reference numeral 13 denotes a stopper device, an enlarged cross section of which is shown in FIG. Reference numeral 14 denotes a stopper plate erected on the weaving arm 10, and 15 denotes a stopper bracket fixed to the frame 1 and having a stopper screw 16 screwed therein. The stopper plate 16 is adjusted by moving the stopper screw 16 in and out of the stopper bracket 15.
, The range of movement of the weaving arm 10 can be set. In addition,
The stopper plate 14 may be fixed to a boss of the crankshaft 11.

FIG. 3 is a view for explaining the operating principle of the air motor 2 used in the present invention. A partition wall 17 for dividing the air motor 2 into large and small chambers A and B is fixed to the output shaft 3. The air motor 2 is provided with two air supply / discharge ports C and D that open to the division chambers A and B. The air supply / discharge port C and D alternately supply and discharge air. Thereby, the dividing wall 17 and the output shaft 3 are swung by a predetermined angle.

The configuration of the present invention is as described above, and the operation thereof will be described below. First, air is alternately supplied to and discharged from the large and small division rooms A and B of the air motor 2 at predetermined intervals. As a result, the output shaft 3 swings by a predetermined angle in a predetermined cycle. As the air, a factory air or a welding shield gas which is piped for an air operation source or another purpose may be used.

The boss portion of the crankshaft 11 is fitted on the output shaft 3 with its axis shifted. Therefore, the swing of the output shaft 3 causes the crankshaft 11 to be displaced from the axis of the output shaft 3. It reciprocates on an arc whose radius is the distance. Since the bearing mounted on the crankshaft 11 is received in the long hole 12 of the weaving arm 10, the weaving arm 10 is reciprocated about the axis of the torch holder support shaft 7 by the reciprocation of the crankshaft 11. You.

Since the weaving arm 10 is fixed to the supporting hardware 6 supporting the torch holder 5, the torch 4 held by the torch holder 5 moves in the same manner as the weaving arm 10. In other words, the swing of the predetermined amplitude is given to the torch 4 at a predetermined cycle by the operation of the air motor 2.

Now, in the operation of the weaving device using the air motor 2, the weaving speed can be adjusted by adjusting the air pressure supplied to the air motor 2 or adjusting the amount of exhaust air from the air motor 2. The adjustment is performed by adjusting a supply / discharge valve (not shown) connected to the air supply / discharge ports C and D.

To adjust the weaving width, use the stopper screw 1
6 is adjusted by adjusting the movement width of the stopper plate 14. At this time, since the driving of the air motor 2 is performed by air, after the stopper plate 14 contacts the stopper screw 16,
The output shaft 3 does not swing further. Further, the weaving width is also changed by replacing the crankshaft with a different amount of displacement of the shaft center.

When the crankshaft 11 and the air motor 2 are replaced, the bearing position of the crankshaft 11 is set within the range of the elongated hole 12 of the weaving arm 10.
Further, when the shield gas for welding is used for the operation of the air motor 2, the exhaust gas from the air motor 2 is guided from the supply / discharge valve to the welding portion by a hose or the like, and is reused as the shield gas for welding. Furthermore, the present weaving apparatus can be used by being attached to an automatic welding machine upside down in accordance with the situation of the welding line.

[0020]

According to the present invention, the weaving mechanism in the automatic welding machine is driven by an air motor, and the working air uses factory air or welding shielding gas. The weaving operation could be performed without providing a source, and the weaving device could be reduced in size and weight because no reduction gear was provided.

Further, the weaving speed and the weaving width can be adjusted by simple adjustment of the supply and discharge of the working air and the stopper, so that welding with different working conditions can be continuously performed. It is now possible to automate welding lines that had not been advanced in the past.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a weaving device according to the present invention.

FIG. 2 is a bottom view of the same.

FIG. 3 is a diagram showing the operation principle of an air motor used in the present invention.

FIG. 4 is a diagram showing a cross section of a stopper device used in the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Weaving device frame 2 Air motor 3 Air motor output shaft 4 Welding torch 5 Torch holder 6 Torch holder support hardware 7 Torch holder support shaft 8 Mounting bracket 9 Welding wire 10 Weaving arm 11 Crankshaft 12 Slot 13 Stopper device 14 Stopper plate 15 Stopper bracket 16 Stopper screw 17 Division wall A, B Division chamber C, D Supply / discharge port

Claims (4)

[Claims] An air motor is mounted on one end of a frame fixed to an automatic welding machine, and a mounting bracket is fixed on the other end.
The output shaft of the air motor is connected to the crankshaft whose axis is shifted by a key, the mounting bracket is used to rotatably support the support shaft, and the support shaft is used to hold a torch holder that holds the torch. Weaving in an automatic welding machine characterized in that the weaving arm is fixed to the supporting hardware, and the crankshaft is connected to the weaving arm so as to allow movement in the front-rear direction and restrict movement in the left-right direction. apparatus. 2. The weaving device in an automatic welding machine according to claim 1, wherein an elongated hole is provided in a longitudinal direction of the weaving arm, and the crankshaft is received in the elongated hole. 3. A large and small division chamber is formed by a rotatable division wall fixed to an output shaft, and an air motor having two air supply / discharge ports is used to supply air to the large and small division chambers. The weaving device for an automatic welding machine according to claim 1, wherein the output shaft is periodically swung by a predetermined angle by periodic switching supply / discharge. 4. The welding gas according to claim 1, wherein a shielding gas for welding is used as a working gas of the air motor, and an exhaust gas from the air motor is guided to a welding portion and reused as a shielding gas for welding. A weaving device in the automatic welding machine as described above.