JP2664003B2 - Seam welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seam welding apparatus for seam welding a rear end of a preceding strip and a front end of a following strip.

[0002]

2. Description of the Related Art FIGS. 3A and 3B are diagrams for explaining the outline of a steel process line and a seam welding machine. Seam welding machine
It is provided for connecting the leading strip 1 and the trailing strip 2 (2a) so as to continuously pass through the processing device of the steel process line. (The existence of the upper side 2a and the lower side 2 in the succeeding strip shows an example of a configuration for reducing the connection time between the strips.)

[0003] The seam welding machine is configured as shown in FIG . That is, the input side clamp 5 and the output side clamp 4 are mounted on the common base 3, and the carriage 6 is disposed between the both clamps. The carriage 6 is moved by a carriage driving device 11 with a guide mechanism (not shown) provided on the common base 3 serving as a guide.

A guillotine shear 9 for cutting a strip, an electrode 8 for welding, a secondary conductor 7 for supplying welding current, and a welding transformer 10 are mounted on the carriage 6.

Next, the operation will be described. After the tail end of the preceding strip 1 and the tip of the following strip 2 (2a) stop at the center of the guillotine shear 9 (within the width of the double cut shear blade), the strips are clamped by the output clamp 4 and the input clamp 5, respectively. Then, the tail end of the preceding strip 1 and the tip of the following strip 2 (2a) are cut by the guillotine shear 9.

Thereafter, the entrance-side clamp 5 is advanced in the line direction (not shown), and the cut strip ends are overlapped with each other. Then, the electrode 8 is lowered and the carriage 6
Is moved by the carriage driving device 11, a welding current is supplied from the welding transformer 10 and the secondary conductor 7, and seam welding is performed. When the welding is completed, the entrance-side clamp 5 and the exit-side clamp 4 are each raised.

[0007] Since the inlet clamp 5 and the outlet clamp 4 of the conventional strip connecting device are configured as described above, a force acts on the strip in the line direction during seam welding. In order to prevent
The entrance side and exit side clamps 5 and 4 need to have a structure of high rigidity, respectively. However, since the entrance clamp 5 has an index function and the exit clamp 4 has a tilting function,
It was difficult to obtain a high-rigidity device, and the gap between the entrance and exit clamps was often widened at the end of welding, and the overlap margin of the strip ends changed, resulting in poor welding. This phenomenon tends to occur when the overlap margin is small or when welding a thick plate.

Next, the mechanism will be described with reference to FIGS. The leading strip 1 and the trailing strip 2 are cut by the guillotine shear 9, and the cut leading strip 1 is tilted by the exit clamp 4. Thereafter, the trailing strip 2 is indexed (advanced) by the entry side clamp 5, and when the indexing is completed, the exit side clamp 4 returns to its original tilting position and the superimposition operation ends (not shown, but adjusts the index amount). Changes the overlap allowance). The overlap portion of the strip end obtained by such an operation is seam-welded with the electrode 8 as shown in FIG. The state diagram is shown in FIG.

[0009]

In the case of seam welding, particularly mash seam welding, since welding is performed while crushing the overlapped portion, a side force acts in the line direction, that is, a force acts in a direction in which the clamp interval increases. This force gradually increases as the electrode advances from the welding start end to the terminal end, reaches a maximum at the welding end, and as a result, the overlap margin changes at the welding start point and the welding end point. The present invention eliminates the above-mentioned drawbacks and at the same time, reduces the strip
Providing high-performance seam welding equipment capable of processing according to sheet thickness
It is intended to be offered .

[0010]

In the seam welding apparatus according to the present invention, the outgoing clamp for restraining the trailing end of the preceding strip and the incoming clamp for restraining the leading end of the succeeding strip are vertically thin. Has a rectangular or wedge-shaped cross section
With mechanically fastened to each other by a fastening member, the fastening
Connect the outlet clamp and the inlet clamp of the member, and
Member having a thin rectangular or wedge-shaped cross section
And the fastening of the fastening member on the exit clamp side.
To the upper and lower positions according to the thickness of the strip.
It is provided with an adjusting device that can be changed.

[0011]

The fastening member according to the present invention prevents a gap between the clamps on the outgoing side and the incoming side from being widened during the seam welding, thereby preventing the overlapping margins of the strips from being uneven, and uses a fastening member that is thin in the vertical direction. This reduces interference with the electrode disk, so that the fastening member can be installed as close to the strip as possible, and the space for the device can be reduced. Also, the exit side of the fastening member
At the clamp side fastening part,
By adding an adjustment device that can adjust the vertical position,
We can respond freely to welding of such thickness.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1A, 1B and 1C, in a state where the exit side clamp 4 for clamping and restraining the preceding strip 1 and the entrance side clamp 5 for clamping and restraining the succeeding strip 2 have secured the overlapping margin of the strip ends, the fastening member 12 is fixed. Inlet clamp 5
And the output side clamp 4 is fixed and positioned by the stopper pin 13. That is, the stopper pin 13 is lowered by the cylinder 14 with the fastening member 12 inserted between the upper and lower guides 15 to integrate the two clamps.

During welding, the upper and lower electrodes 8 are
2 is in contact. When the welding is completed, the upper electrode is raised, and the clamps 4 and 5 are opened thereafter. The upper and lower electrodes 8 run between the clamps while traveling, and when the strip-side end is detected, the upper electrode rises.

Therefore, the fastening member 12 may interfere with the electrode disk depending on the position and the shape. In order to prevent interference, the clamp end and the fastening member 1
Although it is sufficient to widen the interval 2, there is a disadvantage that the mechanical device becomes large. In the present embodiment, the fastening member 12 is formed in a thin rectangular or wedge shape in the vertical direction, and the rising timing of the upper electrode is shifted so that the electrode 8 and the fastening member 12 come into contact with each other.
Since the electrode disk 8 is arranged to roll on the surface of the fastening member 12, there is no problem even if the position of the fastening member 12 is located closest to the clamp side end.

Next, FIGS. 2A to 2E illustrate an arrangement for changing the interval between the clamps. In steel processing lines, strip is passed from thin plate to thick plate,
In mash seam welding, it is necessary to change the overlap margin depending on the thickness of the strip (not shown). Therefore, it is necessary to change the fastening position of the fastening member 12 according to the thickness of the strip in accordance with the overlap margin.

FIG. 2A shows a mechanism for setting the overlap margin stepwise;
FIG. 2B shows a mechanism for setting the overlap margin steplessly. These are all moved up and down by the cylinder 14 (on the drawing).
Is determined by choosing the position.

2C and 2D, a surface having dimensions of A, B and C is provided on a part of the stopper pin 13 from the guide portion, and the surfaces a, b and c are rotated to a position corresponding to the overlap margin. This is an example in which the entrance and exit clamps can be fastened by carrying. That is, the rack and pinion 16 is connected to the cylinder 1
7, the stopper pin 13 is rotated, and a, b,
Select the surface of c and then operate the cylinder 14 (down)
Then, positioning is performed between the guides 15.

FIG. 2E shows an embodiment having a mechanism for sliding the fastening member 12, and
2 is slid and then fixed with the stopper pin 13.

As described above, according to the present invention, the gap between the clamps does not increase during seam welding, and the use of a thin fastening member in the vertical direction allows the fastening member to be connected to the electrode disk. since interfere decreases, it can be installed in the vicinity of the fastening member as possible to the strip position and it is possible to reduce the space of the device together
In the meantime, the outlet side fastening position of the fastening member is
Can accommodate strips of any thickness
Has an effect.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, wherein a is a plan view, b is a front view of a, and c is a cross-sectional view taken along the line AA of a.

FIGS. 2A to 2E are diagrams illustrating a fastening mechanism between clamps, and FIG. 2D is a cross-sectional view taken along line BB of c.

FIGS. 3A and 3B are perspective views showing a seam welding apparatus in a steel processing apparatus.

FIGS. 4A to 4D are explanatory diagrams of the operation of the mash seam welding apparatus.

[Explanation of symbols]

1 leading strip, 2 trailing strip, 4 exit clamp, 5 entrance clamp, 6 carriage, 8 electrode, 9 guillotine shear, 12 fastening member, 13 stopper pin, 14 cylinder, 15 guide.

Claims (1)

(57) [Claims] 1. A a tip portion of the rear end portion and the trailing strip leading strip was cut in each Shah, met those cut edges of both Sutoribbu overlay, seam welded along its overlapping portion Te, a trailing strip and the leading strip was clamped restrained, cut with Thereafter Shah, tilt the outlet side clamp, in that the cutting edge is advanced the inlet side clamp overlay so that, the delivery side In addition to having a fastening member that connects the clamp and the entry-side clamp and has a thin rectangular or wedge-shaped cross section in the vertical direction
In addition, the fastening portion of the
Adjustable to change the position up and down according to the strip thickness
Seam welding apparatus characterized in that a device.