JPS6235580Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of an oscillating device that swings a welding torch during welding.

Generally, when welding thick base materials, the amount of weld deposited is large, so a so-called narrow gap welding method is used in which the groove is narrowed in order to improve welding efficiency. In such narrow gap welding, if the welding torch is configured to reciprocate in parallel with the width of the groove, the outer periphery of the welding torch will move before the welding electrode reaches the side wall of the groove. Since it comes into contact with the front side wall, the side wall of the base metal cannot be welded unless the groove width is set wide.

As a means to solve this drawback, a method has been taken in which the electrode part of the welding torch is oscillated in a pendulum motion so that even when welding a narrow gap, it is possible to weld up to the side wall part of the welding torch.

FIGS. 1 and 2 show a conventional welding torch oscillation device configured to have an oscillating motion. In the figure, 1 is a disk, and this disk 1
is fixed to an output shaft 4 of an electric motor 3 attached to a support frame 2, and a drive shaft 5 is provided on the circumference. Reference numeral 6 denotes a link arm, and this link arm 6 is rotatably held by a support shaft 7 provided on the support frame 2, and is also supported by a groove 8 formed in the link arm 6.
is slidably engaged with. 9 is the above link arm 6
This is a welding torch placed on the opposite side of the groove.

Next, the operation will be explained. When the disk 1 rotates as the electric motor 3 rotates, the drive shaft 5 provided on the disk 1 rotates around the output shaft 4, and while the drive shaft 5 slides in the groove 8 of the link arm 6, This link arm 6 is caused to make a pendulum movement using a support shaft 7 as a fulcrum. Therefore, the welding torch 9 disposed on the link arm 6 also moves in a pendulum motion in an arc centered on the support shaft 7.

FIG. 3 is for explaining the pendulum movement of the link arm on which the welding torch is disposed. In this figure, P is the drive shaft 5 of the oscillating device shown in FIGS. 1 and 2. Similarly, O is a portion corresponding to the output shaft 4 of the electric motor 3, and A is a portion corresponding to the support shaft 7. In addition, P ₁ Q ₁ and P ₂ Q ₂ are connected to the welding torch 9 from the engagement portion P between the groove portion 8 of the link arm 6 and the drive shaft 5.
The lengths of the link arms 6 to the installation position Q, P ₁ and P ₂ respectively indicate the points of contact of the tangent from A to the locus of movement of point P (which is a circle with radius OP).

Now, when point P moves in a uniform circular motion with O as the center, point Q follows the movement of point P and moves Q ₁ Q ₂
In between, the pendulum motion will be made with AQ as the radius.

By the way, if point P rotates clockwise, while point P moves from P ₁ to P ₂ , point Q
_The point Q moves from Q ₂ to Q ₁ while the point P moves from _{P 2 to} P ₁ . At this time, the distance traveled by point P from P ₁ to P ₂ is
The moving distance from P ₂ to P ₁ is different in length as shown by l ₁ and l ₂ in the figure. Therefore, the time taken for point P to move from P ₁ to P ₂ is larger than the time taken from P ₂ to P ₁ , which means that the speed at which point Q moves from Q ₁ to Q ₂ is slower. , which means that the speed from Q ₂ to Q ₁ becomes faster. That is, point Q moves quickly in one direction and slows down in the other direction.

Since the conventional oscillation device is configured as described above, the welding torch oscillated by this oscillation device has a different movement speed depending on the direction of oscillation, which causes the weld bead to become uneven and welding to be difficult. It had defects that degraded quality.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional art, and aims to provide an oscillation device in which the moving speed of the welding torch does not vary depending on the direction of swing.

An embodiment of this invention will be described below with reference to FIGS. 4 to 6. In addition, FIG. 4 is a partially sectional plan view, FIG. 5 is a partially sectional side view, and FIG. 6 is a sectional view taken along the - line in FIG. The drive source is, for example, a reversible electric motor, and a gear 12 is attached to the output shaft thereof.
13 is a gear that meshes with the gear 12, 14 is a drive screw connected to this gear 13, 15 is a slide piece that is threadedly engaged with this drive screw 14 and slidably guided by a guide rod 16, and 15 is a slide piece that is slidably guided by a guide rod 16. As the screw 14 rotates, it is moved in its axial direction, and the connecting plate 17 fixed to the slide piece 15 is also moved. Reference numeral 18 denotes a support shaft, which is rotatably held by the connecting plate 17 via a sliding bearing 19. 2
0 is a guide bar, 21 is a linear motion bearing provided on the support shaft 18, and is engaged with the guide bar 20 so as to be movable in the axial direction thereof. 22 is a swinging piece whose upper end is connected to the guide bar 20
The lower end is further connected to a rotation shaft 23 rotatably held by the support frame 11 (see FIG. 5). A holding frame 24 is fixed to the rotating shaft 23 and holds the welding torch 9. 25 is a base material in which a groove 26 is formed, 27 is this base material 25,
This is a welded portion welded by the welding torch 9 (see FIG. 6).

Next, the operation will be explained. When the reversible electric motor 10 rotates forward, the drive screw 14 rotates through the gears 12 and 13, and the slide piece 15 screwed onto the drive screw 14 moves leftward by A in FIG. 6. When the slide piece 15 moves in this way, the connecting plate 17 fixed to the slide piece 15 also moves by an amount A, so that the guide bar 20 and the guide bar 2
The swing piece 22 fixed at zero uses the rotation shaft 23 as a fulcrum, and rotates together with the rotation shaft 23 by an angle corresponding to A'. Next, when the reversible electric motor 10 reverses, the slide piece 15 moves from the center position O to the right by B, so that the rotation axis 23 is moved in the same manner as above.
rotates through the center point O' by an angle corresponding to B'. Therefore, the welding torch 9 connected to this rotating shaft 23 makes a predetermined pendulum movement. Note that the reversible motion period, rotational motion speed, etc. of the reversible electric motor 10 may be electrically set in advance in accordance with the welding conditions.

In the above embodiment, the reversible electric motor 10 is the gear 1
The drive screw 14 may be directly connected to the output shaft to rotate the drive screw 14 without going through the drive screws 2 and 13. In addition, the thread pitch and length of the drive screw 14, the length of the swing piece 22,
Alternatively, the engagement position between the support shaft 18 and the guide bar 20 may be appropriately selected to suit the thickness of the welding base material 25 or the angle of the groove 26.

Further, a cylindrical screw is used as the drive screw 14, and a boat-shaped guide piece is provided on the slide piece 15 as a subordinate node thereof, so that even if the drive screw 14 continues to rotate in one direction, the slide piece 15 is
It is configured to reciprocate along 4. Alternatively, the drive screw 14 and the electric motor may be connected by a reversible clutch which rotates in the normal direction when connected to one clutch plate and rotates in the reverse direction when connected to the other clutch plate, in which case the motor is a reversible electric motor. It doesn't have to be.

In addition, in an oscillation device equipped with a reversible electric motor, the slide piece 15
moves back and forth with an arbitrary stroke, so
The swing angle of the welding torch 9 can be arbitrarily and easily adjusted without requiring complicated mechanical adjustment work.

As explained above, this device is equipped with a slide piece, which is an inexpensive component, that reciprocates with high accuracy in the axial direction of the screw in response to the rotation of the drive screw, which is rotated by a reversible electric motor installed in the support frame. A swinging piece, a guide bar, a support shaft, and a connecting plate are interposed between the slide piece and the rotating shaft of the welding torch supported at the other end of the support frame, and in particular, the guide bar and support Since the shafts are made to be able to slide relative to each other, the welding torch can achieve highly accurate fan-shaped motion without causing speed differences depending on the direction of swing, and is therefore effective in forming an excellent weld layer.

Furthermore, it is obvious that the position (polar coordinates) of the engagement point between the support shaft and the guide bar can be adjusted by changing the mounting position of the connecting plate and the slide piece. This method also has the effect of making it possible to easily mechanically adjust the reference point and set the optimum conditions for welding.

[Brief explanation of the drawing]

Figures 1 to 3 show conventional oscillating devices, respectively, with Figure 1 being a cross-sectional view, Figure 2 being a front view, Figure 3 being a diagram explaining the operating state, and Figures 4 to 6. 4 shows a partially sectional plan view thereof, FIG. 5 a partially sectional side view thereof, and FIG. 6 a sectional view taken along the line - in FIG. 5. . In addition, in the figure, the same reference numerals indicate the same or corresponding parts, 9 is a welding torch, 10 is a reversible electric motor, 11
1 is a support frame, 14 is a drive screw, 15 is a slide piece, 1
7 is a connecting plate, 18 is a support shaft, 19 is a sliding bearing, 20 is a guide bar, 22 is a rocking piece, 23 is a rotating shaft, and 25 is a base material.

Claims (1)

[Scope of utility model registration request] A reversible electric motor 10 whose rotation amount can be electrically adjusted and which is provided on the support frame 11, a drive screw 14 rotated by this reversible electric motor 10, and this drive screw 1.
a slide piece 15 that reciprocates while slidingly fitting with 4;
A connecting plate 17 that interlocks with this sliding piece 15, and a sliding bearing 19 provided at the end of this connecting plate 17.
The support frame 11 can be rotated through the support frame 11 at the other end.
The rotating shaft 23 of the welding torch 9 is supported by and rotates.
A guide bar 20 fixed to a swinging piece 22 provided in
1. A welding torch oscillation device comprising a support shaft 18 which is slidably fitted to a support shaft 18, and which rotates the welding torch 9 in a fan shape by driving the reversible electric motor 10.