JPH0211999Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a welding machine that joins a leading coil material and a trailing coil material. More specifically, when pressing a backing metal to the butt line of both coil materials, the welding machine This has been improved so that the backing device can be placed even in a small installation space.

When connecting coil materials continuously while repeating line threading, generally the ends of both coil materials are clamped and held by the movable side clamp device and fixed side clamp device of the welding machine, and the ends of the coil materials are It is common practice to trim the parts, match them accurately, and then weld them.

This type of welding machine generally has a built-in weld end face cutting device such as a guillotine shear or roller shear. In addition to flash welding and seam welding, arc welding and laser welding are used as welding methods for coil materials. Particularly in the case of arc welding, a backing metal called a back bar is generally used to flatten the lower surface of the butt wire of the coil material.

Conventionally, when pressing this backing metal against the butt line of the coil material, the backing metal was raised and lowered vertically from below the coil material butt position using a lifting device such as a drive cylinder, or By attaching a backing metal to the lower clamp of one of the clamp devices and moving only the lower clamp forward, the backing metal is positioned on the lower surface of the butt line.

However, in the former case, between both clamp devices,
In other words, since the backing metal device is placed directly below the welding position, the lifting device needs to be devised to move it out of the movement range of the welding end face cutting device, which makes the structure of the welding machine complicated and large. It is also a contributing factor.

On the other hand, in the latter case, only the lower clamp moves forward while the coil material is clamped, and the relative movement of the lower clamp causes damage such as scratches on the lower clamp surface and the lower surface of the coil material, and also causes special movements in the clamping device. This also has the disadvantage of requiring a fairly complicated mechanical and electrical structure including a position control mechanism.

This invention was devised to eliminate these problems, and due to its structural design, it can be used in a butt welding machine for coil materials even in a very limited installation space without interfering with the drive device of the backing metal. It is an object of the present invention to provide a welding machine for connecting coil materials that can reliably press along the lower surface of a target butt line.

Embodiments of the welding machine according to the present invention will be described below based on the drawings.

Figure 1 shows the front of the entire welding machine. FIG. 2 shows a state in which the backing metal of the present welding machine is pressed against the lower surface of the butt line of the coil material, and FIG. 3 shows a state in which the backing metal is returned to its original position.

In the figure, 1 is a guillotine cutting device, 2 is a stationary clamp device, and 3 is a movable clamp device.

The cutting device 1 includes an upper arm 4 of a C-shaped frame 4.
a and the lower arm 4b have an upper blade 5 and a lower blade 6,
One upper blade 5 is moved up and down by cylinders 5a, 5b, 5c fixed to the upper arm 4a, and the other lower blade 6 is moved up and down by a cylinder 6 fixed to the lower arm 4b.
a, 6b, and 6c to move up and down.

In the entire cutting device, the C-shaped frame 4 is moved between the stationary clamp device 2 and the movable clamp device by a drive device 7, for example, a cylinder, in a direction across the coil material, and moves back and forth across the coil material. Moving.

Fixed side clamp device 2 and moving side clamp device 3
are arranged in opposing directions on a fixed base 9, and both upper clamps 2a and 3a are connected to cylinders 2c and 3 fixed to respective upper frames 10 and 10.
c, it moves up and down relative to the lower clamps 2b and 3b, and clamps or opens the end of the coil material S fed onto the line.

The movable clamp device 3 is attached to a fixed base 9 so as to move forward and backward relative to the fixed clamp device 2.
The upper plate 9a is operated by a driving power device 11, for example, a cylinder.

Reference numeral 10 denotes a backing metal mechanism, which is composed of a link mechanism to be described later, and is installed symmetrically on the left and right sides of the welding machine.

Figures 2 and 3 show the specific structure and movement of the backing metal mechanism installed in this welding machine.

Reference numerals 12 and 13 indicate a pair of parallel links whose rear ends are rotatably attached to the welding machine main body side, and one end of one link 12 is attached to the clamp support 14 on the fixed base with an axis a. One end of the other link 13 is attached to a support bracket 15 fixed to the support base 14 via a rotating shaft b. At the tips of the parallel links 12 and 13, support members 17 having a backing metal 16 made of copper or copper alloy attached to the top are rotatably attached via shafts c and d, respectively. Reference numeral 18 denotes a swing lever, which is rotatably fixed together with the link 13 to the rotating shaft b of the support bracket so as to be substantially integrated with the link 13 at a constant angle. Reference numeral 19 denotes a drive cylinder, the main body of which is fixed to the clamp support base 14 in a state parallel to the line direction, and the tip of the cylinder rod 20 is connected to the swing lever 18 described above.
It is rotatably connected to the tip of the

FIG. 4 is an explanatory diagram of the operation of the present invention.

The preceding coil material S ₁ and the succeeding coil material S ₂ flow on the line as shown by the arrow. The terminal end of the preceding coil material and the tip end of the succeeding coil material are clamped by upper and lower clamps 2a of the fixed side and moving side clamp devices 2 and 3, respectively.
2b and 3a, 3b (4th
Figure d).

Next, the cutting device 1 enters between the fixed-side and movable-side clamp devices by the drive device 7 and stops on the line.

After the lower blade 6 of the cutting device is raised to a fixed position by the cylinder 6a, the upper blade 5 is moved to the cylinder 5a.
, and cut the ends of both coil materials S ₁ and S ₂ (see figure b). After cutting, the cutting device 1 returns offline.

Next, the movable clamp device 3 clamps the cylinder 11
However, at this time, the movable clamp device stops after a certain interval e (see c in the same figure).

Next, the backing metal 16 is pressed against the butt ends of the coil material, and the cut ends are sandwiched from the lower side of the upper clamps 2a, 2b, and then the movable side clamp device 3 moves forward on both sides (in the same figure). d and e).

The operation of the elevating mechanism 10 when pressing the backing metal 16 against the butt line of the coil material is described in the second section.
As is clear from the figure and FIG. 3, if the drive cylinder 19 is operated from the return position shown in FIG. 3 and the cylinder rod 20 is moved forward, the parallel links 12 and 13 will swing upward as shown in FIG. Then, the backing metal 16 at the tip of the parallel link is pressed against the lower surface of the coil material to be joined. In addition, when releasing the backing metal 16 from the lower surface of the joint, by operating the drive cylinder 19 in the return direction, the parallel link swings downward and folds into one corner, as shown in FIG. A necessary space is created so that the stopper is sufficiently separated from the lower surface of the joint and does not interfere with the movement of other drive devices.

Now, returning to the explanation of the operation, after the butt lines of the coil materials S ₁ and S ₂ are linearly butted with zero gap as shown in Fig. 4e, the welding torch 21 is driven to the welding start point and the butt line is aligned with the butt line. Welding is started along the line (f in the same figure). Although the drive mechanism of the welding torch is not shown, the welding torch 21 is attached to a torch carriage having a position adjustment mechanism as is generally known, and the torch carriage performs welding and returning to the original position by a drive motor or the like. It's getting old. Now, after welding,
Each clamp device 2, 3 is opened, and the strip is transported to the next process. All movable equipment then returns to its original position and prepares for the next operation.

As explained above, according to the present invention, since the raising and lowering movement of the backing metal is performed by a swing drive type link mechanism using two parallel links, the height of the top surface of the backing metal is worn out. Even if the coil material changes, it can always be brought into contact with the coil material horizontally and with an average upward force, and even in the limited installation space inside the welding machine, it will not interfere with other drive devices. In addition to being able to easily arrange the backing mechanism with plenty of space, it also eliminates the need for complicated and large structures like conventional ones, freeing you from economic and space-related structural design problems. Moreover, it exhibits excellent effects that were previously impossible to touch, such as not damaging the coil material or the clamping surface.

[Brief explanation of the drawing]

Figure 1 is a front view of the welding machine according to the present invention, Figures 2 and 3 are front views showing the link structure and movement of the backing metal lifting mechanism installed in the welding machine, and Figure 4 is a front view of the welding machine according to the present invention. It is an explanatory diagram of the operation of the present welding machine. Explanation of symbols, 10...Backing money lifting mechanism, 12,
13... Parallel link, 16... Secret money, 17...
Support member, 18... Swing lever, 19... Drive cylinder.

Claims (1)

[Scope of utility model registration request] After clamping the end of one coil material and the end of the other coil material and shear cutting the ends of both coil materials, the cut end surfaces of both coil materials are abutted against each other, and the bottom surface of the abutted portion is In a device that continuously welds the abutted portion by pressing a backing metal, the backing metal is rotatable at the tips of two parallel links whose rear ends are rotatably attached to the welding machine main body. A swing lever connected to a drive device is fixed to the parallel link, and the swing lever is swing-driven by the drive device to raise and lower the backing metal. A backing metal device for butt welding coil materials, characterized by: