JPH0157997B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding device suitable for fillet welding.

A conventionally known device of this type has a motor mounted on a base plate located at the tip of an arm (not shown) configured to be movable in the x, y, and z directions, and an eccentric plate on the output shaft of the motor that determines the amount of oscillation. A circular plate is provided, and the two ends of the eccentric plate and the two torch holders are
They are rotatably connected to each other by connecting rods of variable length. Two bearings provided on the base plate swingably support the center portions of the two torch holders with two shafts, and fix the two torches to the tips of the two torch holders.

In the conventional welding device configured as described above, when the motor is operated, a disk having an eccentric plate rotates, and the rotational force is transmitted to the two torch holders via the two connecting rods. The two torch holders continue to swing around the shaft as a fulcrum. When changing the two swing angles, it is sufficient to fix the eccentricity of the eccentric plate provided on the disc to a desired swing angle.

Conventional welding equipment is configured as described above, and has the ability to adjust arc length, torch aiming position, weaving width, etc., but these adjustments are impossible during welding operation. Therefore, once welding has started, even if a misalignment of the torch is discovered, that part must be welded.
In addition, there were drawbacks such as the welding beat becoming irregular because the torch position could not be corrected. Generally, it is often necessary to adjust the arc length, torch aiming position, weaving width, etc. even during welding operation. In addition, collision between the torch and the part to be welded may cause the torch to shift its position or damage the equipment, causing problems in terms of equipment operability, safety, reliability, and ensuring welding quality. .

This invention was made in order to eliminate the drawbacks of the conventional methods as described above, and it provides a highly safe welding position that allows adjustment of arc length, torch aiming position, weaving width, etc. even during welding operation. It is something to do.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional plan view. In Fig. 1, 17 is a mounting plate, 1 and 1' are shafts fixed to this mounting plate 17, and 2 and 2' are respectively rotated in the CD and C'D' directions with the shafts 1 and 1' as the rotation centers. The operating links 14, 14' are tension springs 3, 3' for pulling the links 2, 2' in the Q and Q' directions, respectively, and the shafts 4, 4' are the shafts 3, 4' attached to the links 2, 2'.
EF, E′F′ directions and
This is a link that operates in the IJ and I′J′ directions. 12,1
2' is the torch holder, 5, 5' are the links 4, 4'
This is a pin that rotatably connects the torch holders 12 and 12'. 9 is a shaft fixed to the mounting plate 17, 1
0 is a plate cam that swings in the OP direction about the shaft 9, 10' is a guide portion that is integral with the plate cam 10, and 36 is an eccentric disk having an eccentric amount e that rotates. 8 and 8' are shafts fixed to the plate cam 10, and 7 and 7' are links that individually move in the GH and G'H' directions and in the KL and K'L' directions with the shafts 8 and 8' as rotation centers. be. 13, 13' are torches fixed to the torch holders 12, 12', respectively. 15 is a tension spring attached to the guide portion 10' and the mounting plate 17, and 16 is a tension spring attached to the links 7, 7'. 35 is a plate, and 34 is a round bar temporarily attached to the plate 35. Reference numerals 11 and 11' indicate handles for independently adjusting the torch aiming positions of the torches 13 and 13', 20 and 20' indicate screw shafts integral with the handles 11 and 11', respectively;
9 is a rotatable shaft provided at the tip of the screw shaft 20'. Reference numerals 18 and 18' designate blocks having the function of nuts fixed to the mounting plate 17.

2 is a plan view, and FIGS. 3 and 4 are a cross-sectional side view taken along line XX and a cross-sectional view taken along line Y-Y in FIG.
22 and 22' are blocks each having the function of a nut fixed to the mounting plate 32. 21,2
1' is a handle that can independently adjust the arc length of the torches 13 and 13', 25 and 25' are screw shafts that are integral with the handles 21 and 21', respectively;
23' are rotatable blocks provided at the tips of screw shafts 25 and 25', respectively; 24 and 24' are shafts fixed to blocks 23 and 23', respectively;
3 and 33' are shafts 24 and 2 provided on the mounting plate 32.
This is a guide groove for 4'.

In addition, in FIGS. 2 and 4, 27 is the mounting plate 3.
This is a block that is fixed to 2 and has a bearing function.
26 is a handle that can adjust the swing angle given to the torches 13, 13', and 31 is a threaded shaft integral with the handle 26. 29 is a motor mounting plate having a nut function, 28 is a guide stand for sliding the motor mounting plate 29, 30 is a motor mounted on the motor mounting plate 29, and 36 is an eccentric disk mounted on the motor shaft.

Next, the operation will be explained. 1 and 4, by starting the motor 30, an eccentric disk 3 having an eccentric amount e attached to the motor shaft
6 rotates, and the guide part 1 rotates around the axis 9.
0' and the plate cam 10 swing in the OP direction, the link 7, which is connected to the plate cam 10 by the shafts 8, 8',
7' move in the GH and G'H' directions, respectively. At the same time, the links 7, 7' and the torch holders 12, 12' are connected via pins 6, 6', respectively, and at this time, the links 4, 4' are held in a fixed state by the tension springs 14, 14' and the arc length adjustment mechanism. be. The torch holder 12, with the pins 5, 5' as the center of rotation,
12' and the torches 13, 13' fixed to the torch holders 12, 12' are MN, respectively.
Oscillating motion in the M′N′ direction. Next, torch 13,1
The operation when adjusting the aiming position of 3' will be explained. In Fig. 1, when the handles 11 and 11' are rotated in directions A and A', block 1, which has the function of a nut, is
8, 18' and the threaded shafts 20, 20', the links 2, 2' move in directions C, C' with the shafts 1, 1' as rotation centers, respectively, and at this time, the tension spring 1
4 and 14' actuate links 4 and 4', which are connected to links 2 and 2' which are in an extended state and a contracted state, respectively, through shafts 3 and 3', in directions E and E'. Links 4, 4' and torch holders 12, 1
2' are connected via pins 5, 5', respectively, and at this time, the links 7, 7' are indirectly fixed by the tension spring 16 and the long arc adjustment mechanism. The torch holders 12, 12' and the torch holders 12, 1 are rotated around the pins 6, 6'.
The torches 13, 13' fixed at 2' move in the N and N' directions, respectively. Handle 11,1
When 1' is rotated in directions B and B', blocks 18 and 18' that function as nuts and screw shafts 20 and 2 are removed.
0', links 2 and 2' are connected to axes 1 and 2, respectively.
Movement is performed in directions D and D' with 1' as the center of rotation. At this time, the tension springs 14, 14' are in a contracted state and an extended state, respectively. a link 4 connected to links 2 and 2' via shafts 3 and 3', respectively;
4' and the torch holders 12, 12' are connected via pins 5, 5', respectively, and at this time, the links 7, 7' are connected to the pin 6 which is indirectly fixed by the tension spring 16 and the arc length adjustment mechanism. , 6' as rotation centers, the torch holders 12, 12' and the torches 13, 13' fixed to the torch holders 12, 12' move in the M and M' directions, respectively. Through the above operations, the aiming position of the torches 13, 13' can be adjusted. Next, the operation for adjusting the distance from the torch tip to the welding surface, that is, the arc length, will be explained. In FIGS. 2 and 3, by rotating the handles 21 and 21' in the direction A, the block 2 which has the function of a nut is removed.
2, 22' and the screw shafts 25, 25', the shafts 24, 24' are fixed to rotatable blocks 23, 23', which are mounted on the ends of the screw shafts 25, 25', respectively, and the shafts 24, 24' are fixed to the mounting plates, respectively. It moves in the U and U' directions along guide grooves 33 and 33' provided in 32. At this time, the links 4, 4' are indirectly pulled by the tension spring 16, and the shafts 24, 2, respectively.
4', and the links 4 and 4' also move in the U and U' directions. At this time, shafts 3, 3', shafts 8, 8' and pins 5, 5', pins 6, 6' and link 4,
4' links 7, 7' and torch holders 12, 1
2' respectively, the torch holders 12, 12' and the torches 13, 13' are rotated about the axes 3, 3' and 8, 8' in the JL and J'L' directions, respectively. Operate. By rotating the handles 21, 21' in direction B, the blocks 22, 22' have the function of a nut.
The shafts 24, 2 are fixed to rotatable blocks 23, 23' attached to the tips of the screw shafts 25, 25', respectively, due to the relationship between the screw shafts 25, 25'.
4' move in the T and T' directions along guide grooves 33 and 33' provided in the mounting plate 32, respectively. At this time, the links 4, 4' are indirectly connected to the tension spring 16.
The links 4 and 4' are pulled into sliding contact with the shafts 24 and 24', respectively, and the links 4 and 4' also move in the T and T' directions. At this time, a series consisting of shafts 3, 3', shafts 8, 8' and pins 5, 5', pins 6, 6' and links 4, 4', links 7, 7' and torch holders 12, 12', respectively. Torch holder 12, 12' and torch 13, 1
3' operates in the IK and I'K' directions with shafts 3, 3' and shafts 8, 8' as rotation centers, respectively. Through the above operations, a desired arc length can be obtained. Next, the operation when adjusting the weaving width will be explained. Second
4, when the handle 26 is rotated in the A direction, the motor mounting plate 29 guided by the guide stand 28 and the motor mounting plate 29 are attached due to the relationship between the motor mounting plate 29 having a nut function and the screw shaft 31. The motor 30 moves along the guide stand 28
Slide in the direction. When the handle 26 is rotated in the direction B, the motor mounting plate 29 which has a nut function
The motor mounting plate 29 guided by the guide stand 28 due to the relationship between the screw shaft 31 and the motor 30 mounted on the motor mounting plate 29 moves along the guide stand 28 W.
Slide in the direction. Through the above operations, plate cam 1
The weaving width can be adjusted by changing the distance between the center of rotation at 0 and the eccentric disk 36.

Next, protection of the weaving mechanism will be explained.
In FIG. 1, when the plate cam 10 moves in the O direction, the torch holders 12, 12' and the torches 13, 1 connected via the links 7, 7'
3' move in the M and N' directions, respectively. At this time, the eccentric disk 36 and the guide portion 10' are in a sliding contact relationship, and the force (F) for moving in the O direction is the torque of the motor. The torch 13 moves in the M direction and the plate 3
5, and the torch 13' moves in the N' direction, and the round bar 3
When the pins 6 and 6' are in contact with each other and a force (F) is applied to push them against each other, the pins 6 and 6'
The torch holders 12, 12' and the torches 13, 13' move in the N and M' directions, respectively, to protect the mechanism. Further, as the plate cam 10 moves in the P direction, the torch holders 12, 12' and the torches 13, 13', which are connected via the links 7, 7', move in the N and M' directions, respectively. At this time, the eccentric disk 36 and the guide portion 10' are in a sliding contact relationship, and the force (F) for moving it in the P direction is
depends on the tension of the tension spring 15. Torch 13 is N
When the round bar 34 and the torch 13' move in the M' direction and come into contact with the plate 35, a gap is created between the eccentric disc 36 and the guide portion 10' to protect the mechanism.

FIG. 5 shows an example in which the welding device described above is arranged on a workpiece via a moving mechanism, where 37 is a drive pipe that drives up and down, 38 is a rack mounting plate that is integral with the drive pipe 37, and 39 is a rack mounting plate. It is a rack attached to 38. 46 is a chuck for gripping the round bar 34, 45 is a handle for opening and closing the chuck 46, 42 is a shaft integral with the handle, 43, 4
3' is a bearing stand for the shaft 42, and 44 and 44' are bevel gears. Reference numeral 49 represents a fixed portion having the functions of guiding the drive pipe 37, stopping rotation, and opening and closing the chuck, 40 represents a motor for moving the drive pipe 37 up and down, which is attached to the fixed portion 49, and 41 represents a pinion attached to the motor shaft. Reference numeral 48 denotes a back-and-forth moving mechanism integrated with the drive pipe 37, and 50 is a weaving mechanism that moves back and forth by the back-and-forth moving mechanism. 47 is a torch opening/closing mechanism using a link mechanism. A rack 39 attached to the drive pipe 37 and a pinion 41 attached to the motor shaft are engaged, and by rotating the motor 40, the weaving mechanism 5 moves up and down along the guide and rotation stop of the fixed part 48.
The entire weaving mechanism 50 is moved back and forth by turning the handle 51 along a guide attached to the back and forth moving mechanism 48 of 0 by means of screws and nuts.

The mechanism for holding and moving this weaving device can be used by being held on various traveling carts, regardless of whether it is for vertical welding or horizontal welding. Also,
The arc length, torch aiming position, weaving width, etc. can be easily adjusted for each target model even during welding operation, and the torch swing angle and high-speed swing motion can be easily obtained at the same time, and two locations can be welded simultaneously. This reduces welding time and eliminates processes such as post-welding due to distortion.

As described above, according to the present invention, two torches are provided facing each other and a series of parallel link mechanisms are used for each torch, which not only simplifies the mechanism, but also allows the torch position to be adjusted independently for each torch. With this configuration, it is possible to perform highly reliable and high-quality welding, and there are various effects such as ease of operation.

[Brief explanation of drawings]

1 and 2 are a sectional plan view and a plan view showing one embodiment of the present invention, and FIG. 3 is a
-X sectional view, FIG. 4 is a YY sectional view in FIG. 2, and FIG. 5 is a side view showing an example of the use of the apparatus shown in FIG. In the figure, 1 and 1' are shafts, 2 and 2' are links,
3, 3' are shafts, 4, 4' are links, 5, 5' pins,
6, 6' are pins, 7, 7' are links, 8, 8' are shafts,
9 is a shaft, 10 is a plate cam, 10' is a guide portion, 11,
11' is a handle, 12, 12' are torch holders, 13, 13' are torches, 14, 14' are tension springs, 15 is a tension spring, 16 is a tension spring, 1
7 is the mounting plate, 18, 18' are the blocks, 19 is the shaft,
20, 20' are screw shafts, 21, 21' are handles,
22, 22' are blocks, 23, 23' are blocks, 24, 24' are shafts, 25, 25' are screw shafts, 2
6 is a handle, 27 is a block, 28 is a guide stand, 29 is a motor mounting plate, 30 is a motor, 31 is a screw shaft, 32 is a mounting plate, 33, 33' are guide grooves,
34 is a round bar, 35 is a plate, and 36 is an eccentric disk.
Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A plate cam rotatably attached to a base via a pivot, an eccentric disk that engages with the plate cam, and an elastic body that presses the plate cam against the eccentric disk.
a driving body that rotationally drives the eccentric disk and rotates the plate cam clockwise and counterclockwise about the pivot shaft by an amount corresponding to the eccentricity, and a pair of torches disposed opposite each other. a pair of torch holders to be held; a first link mechanism that supports the pair of torch holders on the base; and a link mechanism that transmits the rotation of the plate cam to the pair of torch holders, and A welding device comprising: a second link mechanism that rotates the torch holder clockwise and counterclockwise about a pivot point on each of the pair of torch holders.