JPS6235579Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a polar coordinate tracing device that enables groove tracing welding in the vertical and horizontal directions in a horizontal fillet welding machine, a lap joint welding machine, etc.

Conventionally, the groove copying device in this type of welding machine has been an electric type as shown in Fig. 1a, a gravity type vertical copying device as shown in Fig. 1b, or a groove copying device as shown in Fig. 1c.
A spring-type lateral copying device as shown in FIG. 1 is known. However, in the electric type, a copying roller or a copying bar 101 is attached to a sensing sensor 102 such as a stress sensor or a magnetic sensor, and when the copying bar 101 comes into contact with the groove surface, bending stress is sensed, and this is electrically transmitted. This method provides feedback to a servo motor and moves vertically and horizontally to imitate the image. Although the performance is good, it is extremely expensive because it requires advanced electronic technology.

In addition, in the gravity type shown in Fig. 1b, a torch 202 is attached to an upper and lower copying roller 201, and the height of the torch 202 is adjusted by its own weight. The problem is that it cannot be done.

Furthermore, as shown in Fig. 1c, with the spring type, the copying roller 301 with the torch 302 attached is adjusted in the left-right direction while being pressed against the side wall etc. by the spring 303, and the side wall must have a height of at least 10 mm. Therefore, it cannot be applied to copying lap joints of thin plates.

Although a combination of these three types of copying devices has been put into practical use, they are not only expensive and have poor operability, but also require a predetermined side wall height. The disadvantage is that it cannot be applied to lap joints.

The present invention solves the drawbacks of the conventional method, and provides a polar coordinate copying device that can perform good vertical and horizontal copying even for lap joints of thin plates, and prevents the groove from going off target during welding. The purpose is to fix a copying branch having a copying roller to the shaft of a welding torch, and to slidably insert the shaft of the welding torch into a thrust bearing. The present invention is characterized in that the thrust bearing is supported so as to freely rotate via a pin joint, and the groove tracing of the welding torch is held by gravity in the vertical and horizontal directions according to the tracing roller.

Hereinafter, the polar coordinate copying apparatus according to the present invention will be explained in detail based on the embodiment shown in FIG.

FIG. 2a is a top view of the polar coordinate copying device according to the present invention, and FIG. 2b is a top side view, in which the welding torch 1 moves in the direction of arrow A as the traveling carriage 2 travels. . A welding torch 1 has a profiling branch 4 equipped with a profiling roller 3 at its tip and a fixing metal fitting 5.
Fixed by Further, the shaft of the welding torch 1 is inserted into a thrust bearing 6 so that it can freely move in the direction of arrow B together with the copying roller 3. Furthermore, the thrust bearing 6 is supported by a pin joint 7 and can freely rotate in the direction of arrow C. It is fixed to a torch support stand 10 fixed above.

When copying and welding the overlapped welding plates 11a and 11b using the polar coordinate copying device configured in this way, the welding torch 1 is moved by the pin joint 7 due to its own weight.
The copying roller 3 rotates downward centering on the welding plate 1.
It will be held at a position in contact with the welded parts 1a and 11b. If you move the traveling trolley 2 there,
While the copying roller 3 slides on the welding plates 11a and 11b, it is positioned in the left-right direction at the corner position of the lap joint, and the welding torch 1, which is integrally fixed with the copying roller 3, is also held at a predetermined welding position in the left-right direction. .
At this time, the welding torch 1 is
It slides freely inside and rotates freely by the pin joint 7 to maintain its vertical position.

Therefore, even if the groove moves due to distortion of the welding material or displacement of stacked plates during welding work, the sliding inside the thrust bearing 6 and the pin joint 7
Due to the rotation of the copying roller 3, the copying roller 3 always moves inside the groove, and the tip of the welding torch 1 also moves along the copying roller 3.
It becomes possible to move by following the

Note that the angle and position of the welding torch 1 are preferably set to predetermined positions using the vertical adjustment screw 8 and the horizontal adjustment screw 9 before welding starts.

As described above in detail based on the embodiment shown in the drawings, according to the polar coordinate copying device according to the present invention, the shaft of the welding torch is inserted into the thrust bearing so as to be freely movable. With,
It has a simple structure in which the thrust bearing is attached to a pin joint so that it can rotate freely.
Even when the welding material is distorted or the overlapped joint of thin plates is misaligned, the groove can be accurately traced vertically and horizontally, and even when the side wall height is low, the groove target will not be misaligned during welding, ensuring accuracy. This enables good profile welding. Moreover, it is easy to operate and has practical effects.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a groove copying device showing a conventional embodiment, and Fig. 2 shows an embodiment of a polar coordinate copying device according to the present invention, in which a is a top view, b is a side view of a, and c FIG. 2 is a sectional view showing a weld bead according to the present invention. In the drawing, 1 is a welding torch, 2 is a traveling trolley, 3 is a copying roller, 4 is a copying branch, 5 is a fixture,
6 is a thrust bearing, 7 is a pin joint,
8 is a vertical adjustment screw, 9 is a left and right adjustment screw, 10 is a torch support stand, and 11a, 11b are overlap welding plates.

Claims (1)

[Scope of utility model registration request] A copying branch having a copying roller is fixed to the shaft of a welding torch, and the shaft of the welding torch is slidably inserted into a thrust bearing, while the thrust bearing is supported so as to be freely rotatable via a pin joint; A polar coordinate copying device characterized in that the groove copying of a welding torch is held in vertical and horizontal directions by gravity according to a copying roller.