JPH0315264Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a weaving device for a welding torch used in automatic welding.

[Prior art and its issues]

In automatic welding, a weaving device that mechanically swings a welding torch has conventionally been used in order to prevent welding defects such as so-called undercuts and overlaps. The oscillation mode of the welding torch of conventional weaving equipment is generally a reciprocating motion (arc-like motion) in a direction almost perpendicular to the welding direction, and the oscillation width can be set arbitrarily according to the width of the welding part. It was structured so that it could be done. However, such conventional weaving devices have the following problems. In other words, as in the case of welding by skilled workers, the welding torch oscillates during welding in a circular motion in which the locus of the welding torch intersects in a spiral pattern, and the arc heat is distributed evenly to the welded part. is considered ideal. However, since the welding torch of a conventional weaving device can only perform reciprocating motion, the trajectory during welding becomes a mountain shape with no intersections, resulting in uneven heating by arc heat. Therefore, welding defects such as undercuts and overlaps are still likely to occur, and in this respect it is still not functionally sufficient.

[Purpose of invention]

In this invention, the welding torch is oscillated in a circular motion, so that the trajectory of the welding torch during welding is spiral, so that the welded part can be heated evenly.
The purpose is to reduce the occurrence of welding defects in automatic welding.

[Structure of the idea]

The structure of the present invention taken to solve the above problems and achieve the purpose is as follows. That is, in the present invention, two or more rotating shafts are arranged in parallel on the base, any one of the rotating shafts is driven by a motor provided on the base, and the other rotating shafts are driven by a motor provided on the base. It is configured to rotate synchronously in the same direction as a rotating shaft driven by a motor via a mechanism, and mounting holes are provided on the end faces of the rotating shafts at the same eccentric distance from the axis, and amplitude adjustment shafts are provided. is mounted, and the other rotating shaft is provided with a through hole that penetrates the mounting hole, the through hole has a drive section at one end, and the other end is connected to the base end of the amplitude adjustment shaft. The amplitude adjustment shaft is configured to be rotatable by penetrating the rotation shaft, and the amplitude adjustment shaft is configured to rotate synchronously in the same direction through a motion transmission mechanism. A fixing means is provided between the amplitude adjusting shaft and the rotating shaft so that the amplitude adjusting shaft is fixed at the adjustment position so as to rotate integrally with the rotating shaft, and an amplitude adjusting shaft is provided at the tip of the amplitude adjusting shaft. This is a weaving device for a welding torch, in which a drive pin protrudes at the same eccentric distance from the axis of the welding torch, and a torch fixing arm for attaching a welding torch is pivotally attached to the drive pin. There are usually two rotating shafts, but there may be more than that. A gear mechanism is generally used as the motion transmission mechanism for interlocking the rotation shaft and the amplitude adjustment shaft, but other mechanisms may be used as long as they can be rotated synchronously in the same direction.

【Example】

The present invention will be explained in more detail based on embodiments shown in the drawings. FIG. 1 is a sectional view showing the internal structure of one embodiment, and FIG. 2 is an explanatory view showing the movement of a torch fixing arm. The weaving device A includes a case 1 serving as a base. A bearing frame 10 is provided inside the case 1, and the bearing frame 10 has two rotating shafts 2, 2.
a are rotatably arranged in parallel via bearings B, respectively. Gears G1 and G2 having the same number of teeth are fixed to the bodies of both rotating shafts 2 and 2a, respectively. Both gears G1 and G2 are interlocked via an idle gear G3 which is rotatably provided at an intermediate portion thereof, whereby the rotating shafts 2 and 2a rotate synchronously in the same direction. The rotating shaft 2 is connected to a rotating shaft M1 of a motor M attached to the outside of the case 1, and is driven by the motor M. Mounting holes 2b and 3b are provided at the tips of both rotating shafts 2 and 2a at the same eccentric distance, and cylindrical bushes 20 and 20a are buried therein, respectively. , 3a are rotatably fitted. Gears G4 and G5 having the same number of teeth are fixed to the tips of the amplitude adjustment shafts 3 and 3a. Reference numeral 32 denotes a fixed arm through which the amplitude adjustment shafts 3 and 3a can rotate, and an idle gear G6 is rotatably supported in the intermediate portion thereof. Gears G4 and G5 are interlocked via idle gear G6, and amplitude adjustment shafts 3 and 3a rotate synchronously in the same direction. The rotating shaft 2a has a through hole 2 that penetrates the mounting hole 2b.
0b is provided. A rotation shaft 34a having a drive portion at one end and connected to the base end of the amplitude adjustment shaft 3a at the other end is inserted through the through hole 20b to connect the amplitude adjustment shafts 3, 3.
A can be rotated. The driving portion of the rotating shaft 34a penetrates the rotating shaft 2a and protrudes to the outside of the case 1, and a knob 34 is fixed to the tip end thereof. In addition, the amplitude adjustment axes 3, 3
A is equipped with a ratchet mechanism so that the amplitude adjustment shaft 3a can be fixed at any position by turning a knob 34. That is, a plurality of claws 30b are formed on the upper circumferential surface of the amplitude adjustment shaft 3a over the entire circumference. On the other hand, an accommodation hole 20c is bored in the rotating shaft 2a toward the claw 30b side. A coil spring 4 is built in the housing hole 20c, and a steel ball 40 is disposed at the tip thereof to engage with the recess 30c between the claws 30b, and is biased toward the amplitude adjustment shaft 3a. Thereby, the amplitude adjustment shaft 3a can be fixed at any position on the rotation shaft 2a. Drive pins 30, 30a are protruded from the tips of the amplitude adjusting shafts 3, 3a at the same eccentric distance from the axes of the amplitude adjusting shafts 3, 3a. Both drive pins 3
The rotation locus of the rotation shafts 2 and 30a is set to overlap at one point with the axes of the rotation shafts 2 and 2a (the fifth
(see figure). A torch fixing arm 5 to which a welding torch (not shown) is attached is attached to both drive pins 30, 30a. Drive pins 30, 30a are attached to the torch fixing arm 5 so as to be rotatable therethrough. (Function) Figures 3 to 5 are shown. Figures 3 to 5
The figure is an explanatory diagram showing how the radius of the circular motion of the drive pin changes. The operation of this embodiment will be explained with reference to FIGS. 1 to 5. Turn the knob 34 to rotate the amplitude adjustment shaft 3a to set the position of the drive pin 30a on the rotation shaft 2a.
The amplitude adjustment shaft 3 is interlocked by a gear G5, an idle gear G6, and a gear G4, and the drive pin 30 is set at the same position as the drive pin 30a (the eccentric distances on the rotating shafts 2 and 2a are the same). Ru. When the rotating shaft 2 is driven by the motor M, the gear G
1. The rotating shaft 2a is synchronously rotated in the same direction as the rotating shaft 2 by the idle gear G3 and the gear G2. As a result, the drive pins 30, 30a, which are positioned at the same eccentric distance on the rotating shafts 2, 2a, rotate at a predetermined radius of rotation, and the torch fixing arm 5 also moves circularly at the same radius of rotation. In FIG. 3, the rotation shaft 2 of the drive pin 30a
The position on a is farthest from the center of rotation of the rotating shaft 2a, and the eccentric distance is maximum.
Maximum turning radius. In FIG. 5, the rotation shaft 2 of the drive pin 30a
The position on a overlaps the center of rotation of the rotating shaft 2a, and the drive pin 30a does not move circularly even when the rotating shaft 2a rotates, so the torch fixing arm 5
It doesn't move either. In FIG. 4, the eccentric distance is set to 1/2 of the state shown in FIG. 5, and the radius of rotation of the circular motion of the torch fixing arm 5 is also 1/2. In this way, the radius of rotation of the circular motion of the torch fixing arm 5 can be set arbitrarily within the range of the state shown in FIG. 3 and the state shown in FIG. Note that the present invention is not limited to the illustrated embodiment, and various modifications can be made within the scope of the claims of the utility model registration.

[Effect of the idea]

The present invention has the above configuration and has the following effects. (a) The oscillation form of the torch fixing arm is a circular motion, and by moving the workpiece linearly at a constant speed, the trajectory of the welding torch during welding becomes a spiral. Therefore, since the welded part can be heated evenly, welding defects are less likely to occur and quality is improved. (b) Since the rotation radius of the circular motion of the torch fixing arm can be set arbitrarily within a certain range, it can be used in a wide range of automatic welding.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the internal structure of one embodiment, FIG. 2 is an explanatory view showing the movement of the torch fixing arm,
FIG. 3, FIG. 4, and FIG. 5 are explanatory diagrams showing changes in the radius of circular motion of the drive pin. A... Weaving device, 1... Case, 2,
2a... Rotating shaft, G1, G2... Gear, G3...
Idle gear, M...Motor, 3, 3a...Amplitude adjustment shaft, 30, 30a...Drive pin, G4, G5
...Gear, G6...Idle gear, 5...Arm for fixing the torch.

Claims (1)

[Claims for Utility Model Registration] Two or more rotating shafts 2, 2a are arranged in parallel on the base 1, and any one of the rotating shafts 2, 2a is driven by a motor M provided on the base 1. The other rotating shaft 2a is configured to rotate synchronously in the same direction as the rotating shaft 2 driven by the motor M via a motion transmission mechanism, and the end surfaces of the rotating shafts 2, 2a are provided with: Amplitude adjustment shafts 3 and 3a are mounted with mounting holes 2b and 3b provided at the same eccentric distance from the axis, respectively, and the other rotation shaft 2a has a through hole 20b penetrating into the mounting hole 2b. A rotation shaft 34a having a driving portion at one end and connected to the base end of the amplitude adjustment shaft 3a at the other end is inserted through the through hole 20b, so that the amplitude adjustment shaft 3a can be rotated. The amplitude adjustment shafts 3, 3a are configured to rotate synchronously in the same direction through a motion transmission mechanism, and the amplitude adjustment shafts 3, 3a are rotated in synchronism with the rotation shafts 2, 2.
A fixing means is provided between the amplitude adjusting shafts 3, 3a so that the amplitude adjusting shafts 3, 3a rotate integrally with the rotating shafts 2, 2a so as to be fixed at the adjustment position. Drive pins 30, 30a are protruded at the same eccentric distance from the axes of the amplitude adjustment shafts 3, 3a, and a torch fixing arm 5 for attaching a welding torch is pivotally attached to the drive pins 30, 30a. A weaving device for a welding torch characterized by: