JPH0324297Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a mobile seam welding method for welding upright flanges of painted steel plates to each other to prevent rain leakage from roofs of buildings such as ordinary houses, factory buildings, and gymnasiums. The present invention relates to a device, and particularly to a device that can reliably remove paint baked on an electrode roller.

(Conventional technology) Conventionally, in mobile seam welding equipment that welds upright flanges of painted steel plates, the high heat during seam welding causes the paint to come off, adhere to the electrode rollers, and cause current to flow between the two electrode rollers. To avoid this problem, a wire brush roller is brought into contact with the electrode roller, and the paint adhering to the electrode roller is brushed off.

(Problems to be solved by the invention) In the above conventional mobile seam welding equipment, the electrode roller is simply brushed with a wire brush roller, so it is impossible to completely remove the paint baked on the electrode roller. be. For this reason, after seam welding a relatively short distance, a worker has to use sandpaper to scrape off the paint baked on the electrode roller, which is time-consuming.

The present invention was developed in view of the above problems, and the purpose is to provide a mobile seam welding device for painted steel sheets that can reliably remove paint baked on the electrode roller at the same time as seam welding. There is.

(Means for Solving the Problems) In order to solve the above problems, the mobile seam welding device for painted steel sheets of the present invention has a pair of arms attached to the main body of the device that can be moved along the flanges of the painted steel sheets. a pair of electrode rollers rotatably supported by each arm, and a biasing means for biasing the arms in a direction toward each other to bring the electrode rollers into contact with the flange with an appropriate pressure; A cutting tool is provided which is movably supported by each arm and whose tip abuts the outer peripheral surface of each electrode roller,
A pressing means is provided for pressing each bit against each electrode roller with an appropriate pressure.

(Function) In the above configuration, the device body is moved along the flange with both electrode rollers in contact with the flange by the biasing means, and at the same time, current is applied between the electrode rollers to seam weld the flanges together. Furthermore, the tip of the cutting tool is pressed against the electrode roller with appropriate pressure by the pressing means to scrape off the paint baked on the electrode roller.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. This embodiment relates to a self-propelled seam welding device, and is provided with a device main body 3 equipped with casters 2 that can freely run along a flange 1a of a painted steel plate 1.As shown in FIG. A pair of upper and lower support plates 4 are provided extending forward from the support plate 4, and a pair of support shafts 5 are fixed with nuts 6 between the front ends of both support plates 4.
A pair of arms 7 whose base ends are rotatably supported are provided on each of the support shafts 5, and a pair of electrode rollers 8 are rotatably supported on each arm 7. Further, as shown in FIGS. 1 to 3, a biasing device 9 is provided which biases the arms 7 in a direction toward each other so that both electrode rollers 8 come into contact with the flange 1a with an appropriate pressure. A biasing force release lever 10 for releasing the biasing force of the biasing means 9 is provided, and a paint scraping device 11 is provided opposite each electrode roller 8.

The biasing means 9 includes a rotating piece 13 rotatably fitted into a through hole of one arm 7 and a screw shaft 14 movably inserted into a horizontal hole of the rotating piece 13. Rotating pin 1 in the through hole
The lower end of the rotary pin 15 is connected to one end of the screw shaft 14 via the first and second links 16 and 17, and the urging force release lever 10 is connected to the upper end of the rotary pin 15. The lower end of is fixed. Also, a wing nut 18 is attached to the other end of the screw shaft 14.
are screwed together, and the wing nut 18 and rotating piece 13
A spring 19 is interposed between the two. In the state shown in FIGS. 1 to 3, the electrode roller 8 contacts the flange 1a with a predetermined pressure via the arm 7 due to the biasing force of the spring 19.

The device main body 3 is provided with a welding transformer 21, and the secondary terminal 22 of this welding transformer 21 is provided at the base end of each arm 7 via a flexible conductor 23, as shown in FIG. The conductive arm 24 is connected to the conductive arm 24 , which is further electrically connected to each of the electrode rollers 8 .

As shown in FIG. 3, the paint scraping device 11 is provided with a support rod 26 attached to each conductive arm 24 via an insulator and extending forward, and as shown in FIGS. A cylinder 28 is provided which is fixed to the tip of the rod 26 via a connecting rod 27 and which faces the outer peripheral surface of each electrode roller 8. A moving shaft 29 is inserted into each cylinder 28, and a cylinder 28 is provided at the tip of each moving shaft 29. A screw hole 32 formed at the rear end of the cylinder 28 is provided with a bit 31 that is secured with a bolt 30 and whose tip abuts the outer peripheral surface of each electrode roller 8.
A pressing spring 33 is provided between the adjusting screw 33' which is screwed into the adjusting screw 33' and the moving shaft 29 to press the cutting tool 31 linearly against the electrode roller 8 with an appropriate pressure, and a lock nut which is screwed into the adjusting screw 33'. 34,
A retaining stopper 37 is provided at the front end of the cylinder 28 to be secured with a bolt 35 and to engage with a notch 36 of the moving shaft 29.

In FIGS. 1 and 2, reference numeral 39 is a drive motor provided on the upper support plate 4, which rotates each electrode roller 8 in the direction of arrow A via a gear mechanism. Reference numeral 40 denotes a frame disposed on the main body 3 of the apparatus, in which an operation box 41 is disposed. Reference numeral 42 denotes a flange holding rod, the upper end of which is secured with a nut to a protrusion 43 protruding forward from the lower part of the drive motor 39, and the holding roller 44 provided at the lower end is configured so as to come into contact with the upper end of the flange 1a. ing. Note that both electrode rollers 8 are designed to be cooled by a water cooling device (not shown).

The operation of the above configuration will be explained.

The state shown in FIGS. 1 to 5 is a weldable state, in which both electrode rollers 8 are strongly pressed against the flange 1a by the spring 19 of the urging means 9. When the drive motor 39 is operated from this state to rotate the electrode roller 8 in the direction of arrow A, this welding device moves forward. At the same time, welding transformer 2
1 to both electrode rollers 8 through the flexible conductor 23, and the flanges 1a are seam-welded by the heat generated by the contact resistance at that time.

Then, by seam welding, the painted steel plate 1
The paint is removed and the paint is baked onto the outer peripheral surface of the electrode roller 8, but the baked paint is scraped off by the cutting tool 31 which is pressed against the outer peripheral surface of the electrode roller 8 with appropriate pressure. Therefore, the surface of the portion of the electrode roller 8 that contacts the flange 1a is always exposed, and a predetermined amount of current can continue to flow between the two electrode rollers 8.
Even if it is a, it is possible to completely seam weld it from end to end.

Next, after welding flange 1a, the adjacent flange 1
When moving to step a, after the motor 39 has stopped, the urging force release lever 10 is rotated in the direction of arrow B (see FIG. 3). Then, the biasing force of the spring 19 is released,
Both arms 7 move away from each other, and electrode roller 8 also moves away from flange 1a. At this time,
Since the paint scraping device 11 also moves together with the arm 7, the relative relationship between the electrode roller 8 and the cutting tool 31 does not change, and there is no fear that the cutting edge of the cutting tool 31 will bite into the electrode roller 8.

Through the above operations, the welding device separated from the welded flange 1a is made to straddle the adjacent flange 1a,
When the biasing force release lever 10 is rotated in the direction opposite to the arrow B, the electrode rollers 8 again clamp the flange 1a, and seam welding becomes possible. At this time, when the welding device is moved backward for positioning, both electrode rollers 8 are rotated in the opposite direction of arrow A. However, since the tip surface of the cutting tool 31 is inclined 31a, the cutting edge of the cutting tool 31 is It will not be damaged by the electrode roller 8.

According to the above configuration, the cutting tool 31 is connected to the electrode roller 8
On the other hand, since the paint is pressed linearly without using a rotating arm or the like, the structure of the paint scraping device 11 is simplified, the number of parts is small, and the size can be reduced.

In the above embodiment, a self-propelled seam welding device has been described as an example, but the present invention can also be applied to a portable seal welding device without a caster 2. Furthermore, in order to prevent deterioration of welding conditions caused by the clamping force of a pair of electrode rollers,
A pair of driving clamping rollers for clamping a steel plate flange are provided in front of the pair of electrode rollers, and the seam welding device is self-propelled by the rotation of the pair of clamping rollers and the pair of electrode rollers. can also be easily applied.

(Effects of the invention) As described above, according to the invention, a cutting tool is provided whose tip abuts on the outer peripheral surface of each electrode roller, and a pressing means is provided for pressing each tooling tool toward each electrode roller with an appropriate pressure. Therefore, the paint baked on the electrode roller can be completely scraped off at the same time as seam welding. Therefore, even if the flange is long, it is possible to completely seam weld the flange by continuing to flow a certain amount of current between both electrode rollers from one end to the other.

Moreover, in the case of the present invention, since it is possible to press the cutting tool linearly toward the electrode roller, the mechanism for removing paint from the electrode roller can be made smaller, and it can also be used in seam welding equipment where space is limited. It can be easily incorporated.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a front view, Fig. 2 is a side view, Fig. 3 is a bottom view of the main part, Fig. 4 is an enlarged front view of the main part, and Fig. 5 is a front view. It is a partially notched enlarged bottom view of the same main part. DESCRIPTION OF SYMBOLS 1...Painted steel plate, 1a...Flange, 3...Device body, 7...Arm, 8...Electrode roller, 9...
...Biasing device, 11...Paint scraping device, 31...
...Bite, 33...Pushing spring.

Claims (1)

[Scope of utility model registration request] A pair of arms are rotatably provided on the main body of the device, which is movable along the flange of the painted steel plate, and each arm is provided with a pair of rotatably supported electrode rollers, and the arms are biased toward each other. By doing so, a biasing means for bringing the electrode roller into contact with the flange with an appropriate pressure is provided, and a tool is provided which is movably supported by each arm and whose tip abuts on the outer peripheral surface of each electrode roller. A mobile seam welding device for painted steel sheets, characterized in that a pressing means is provided for pressing each electrode roller with an appropriate pressure.