JPH0318062Y2 - - Google Patents

Description

[Detailed explanation of the invention] (1) Purpose of the invention (industrial application field) This invention relates to a clamping jig for seam welding of shell plates. It is used with a special welding machine that has an extended protrusion and cuts off the protrusion after seam welding.

(Prior Art) In seam welding of body plates, normally a rod-shaped fixed electrode is passed inside the body plate and applied to the inner surface of the welding part, and a disc-shaped seam welding electrode is applied to the outer surface of the welding part and is moved.

Since a large current and pressure are used, there is a high risk that the overlapped welded parts will open from side to side during welding. Therefore, if you want to clamp both sides of the welded part, you will need a powerful hydraulic system, and if you do not have that equipment, you can temporarily weld each shell plate at intervals in advance, and during welding, the front overlapping parts will be separated from the left and right sides. Prevent it from opening.

(Problem to be solved) This invention does not require the above-mentioned powerful hydraulic system, nor does it require the trouble of temporarily welding each piece, and uses a simple toggle clamp mechanism that not only clamps both sides of the weld. At the same time, the welding part can be positioned and the position can be maintained.

(2) Structure of the device (means for solving problems) This device uses the shape of a protrusion extending from the edge of the shell plate near the seam as an extension of both ends of the weld line that is cut off after seam welding of the shell plate. A trapezoid of constant size with the end as the base and the extension of the seam plate edge as the vertical side,
A clamping jig for pressing the edges of the body plate with the trapezoidal protrusion from both sides and stacking it on a fixed welding electrode for seam welding, the clamp member having its lower end pivoted and holding the edge of the plate at its upper end. a toggle clamp mechanism having a swinging arm with a oscillating arm attached thereto, a link mechanism that drives the swing arm, a fluid pressure cylinder that pushes and pulls the link connecting shaft and pressurizes it; and a positioning member provided at a position to press a side edge, which is an inclined side, of the trapezoidal protrusion, and when the link mechanism is straight and stretched, each of the positioning members pushes the side edge of the protrusion, This is a clamp jig for body plate seam welding, which is characterized by being pushed to the desired position during welding and then stopped.

(Function) Conventional hydraulic clamps directly suppressed both sides of the welded area with their pressure, requiring a large amount of hydraulic pressure. However, with this design, which drives the toggle clamp mechanism using a fluid pressure cylinder, the toggle clamp mechanism is driven by a fluid pressure cylinder. Capable of extremely strong clamping. This is because the final position of the clamp member of the toggle clamp is on both sides of the welded part, which is the normal position. Furthermore, when the final position is reached, the positioning members provided at both ends of the clamp member It also has a positioning effect by pushing the side edge of the weld part to place it in the correct position. Conventionally, the positioning means and the clamping mechanism were separate, but according to this invention, the movement of the clamping member into the clamping position makes it possible to position both edges of the body plate in the correct overlapping state.

This was possible because the body plate extension protrusion used to create the seam weld extension was used as a positioning protrusion for the first time.Of course, even after positioning and fixing, expansion during welding and crushing action by the electrode This also prevents the troublesome phenomenon of the upper and lower welds moving from side to side just before welding.

(Embodiment) Figures 1 and 2 show an embodiment of this invention. Figures 3 and 4 show the state of the shell plate to be seam welded, particularly the extended protrusion of the overlap weld. Its plan view appears in FIG. The reason why the material is made to protrude in advance so as to extend the welded part is to cut off the welding start end and end end and obtain a sound body plate welded part over the entire length. As shown in FIG. 6, the protrusion has a trapezoidal shape with a fixed size, with the end of the body plate as the base and the extension of the edge of the joint plate as the vertical side.

In the figure, the above-mentioned body plate is 1, and its trapezoidal protrusion is 1.
a, the side edge which is the inclined side of the trapezoid is 1b, the vertical swing arm is 2, the clamp member is 3, the link mechanism is 4, the link connecting shaft is 4a, the fluid pressure cylinder is 5, the left and right toggle clamp mechanisms are 6, The positioning member is shown as 7. W is the overlap weld, E ₁ is the lower fixed electrode, E ₂
is the upper rotating electrode.

The support shafts 9 of the left and right vertically swinging arms 2 are provided below the seam welding machine frame 8 that cantilever-supports the lower fixed electrode _E1 . Then, the push-up pin 10 passed horizontally through the outer lower part of the swing arm 2 is connected to the link mechanism 4.
I try to push it up at the top of the.

The link mechanism 4 has a pair of upper and lower link plates connected by a connecting shaft 4a, and a lower end thereof is fitted into a support pin 11 fixed on the machine frame 8. Link connection shaft 4a
Also, in this case, it is a pin, with upper and lower links fitted on both sides thereof, and an engaging fitting 12 connected to the rod tip of the fluid pressure cylinder 5 fitted in the center. As shown by the chain line in FIG. 1, the pushing and pulling of the cylinder 5 causes the engagement fitting 12 at the tip of the rod to move vertically as well as horizontally, so the cylinder 5 is rotatably mounted on a support shaft 5a.

When inserting the body plate 1 to be welded onto the lower electrode _E1 , the rod of the cylinder 5 is projected, the link mechanism 4 is folded as shown by the chain line, and the swing arm 2 is opened to the position shown by the chain line. Then, when you pull in the cylinder 5 rod,
When the upper and lower links of the link mechanism 4 become straight as shown by the solid line and are stretched, when the maximum pushing force is reached, the clamp member 3 moves along the welded part of the body plate 1 to the circumferential surface of the lower electrode _E1 . At the same time, the positioning members 7 attached to both sides of the clamp member 3 press the side edge 1b of the body plate protrusion 1a to the position where it should be during welding and stop. I know it's a little late, but before welding, both edges of the shell plate 1 to be welded are slightly open, so by bringing the edges together and positioning them, they overlap correctly as a welding part. Note that the clamp member 3 strongly presses the body plate 1 against the lower electrode _E1 ,
If the positioning members 7 do not necessarily reach their normal positions at the same time, more emphasis is placed on positioning. When the positioning is completed, the movement of the swinging arm 2 is stopped, and at that time, check whether the pressing force of the clamp member 3 is weak or not.
It doesn't matter if it's still floating. Because,
During welding, the welded part spreads to the left and right due to thermal expansion and the crushing action of the electrode, but since the lower surface of the body plate 1 is supported by the receiving material 13, the left and right clamp members 3 control the opening movement of the body plate 1. This is because it works like this.

(3) Effects of the idea This idea extended the welding line and used the protruding part of the body plate, which is cut off after welding, for the first time to determine the welding position of the body plate, making it an effective means of preventing displacement during welding.

That is, positioning members are provided at both ends of the clamp member that holds both sides of the welding part, and the positioning members are used to push the side edges of the body plate protrusion in a substantially horizontal direction to bring them to the welding position.
Since they are stacked correctly, clamping and positioning are completed at once by the same mechanism.

Moreover, in the past, the only way to prevent the upper and lower welding edges from moving during welding was to rely on clamping force, that is, frictional force. The positioning member
It has the great effect of directly blocking the upper and lower weld edges from opening to the left and right.

Furthermore, since the clamping mechanism is a toggle clamp, the advantage of being able to obtain a large clamping force with normal fluid pressure is also practically effective.

[Brief explanation of drawings]

Figures 1 and 2 are front and side views of an embodiment of this invention, Figures 3 and 4 are side views and elevation views of the shell plate to be welded, and Figures 5 and 6 are elevation views of the clamp member and positioning member. FIG. 3... Clamp member, 6... Toggle clamp mechanism, 7... Positioning member.

Claims (1)

[Claim for Utility Model Registration] As an extension of both ends of the weld line that is cut off after seam welding of the shell plates, the shape of the protrusion extending from the edge of the shell plate near the joint is defined as the seam plate edge with the edge of the shell plate as the base. A clamping jig for seam welding a trapezoid of fixed size with the extension part as the vertical side, pressing together the edges of the body plate with the trapezoidal protruding part from both sides, overlapping it on a fixed electrode for welding, the lower end A swinging arm that is pivoted and has a clamp member attached to the upper end to hold down the edge of the plate, a link mechanism that drives this, and a link mechanism that pushes and pulls the link connecting shaft,
The link mechanism includes a doggle clamp mechanism having a fluid pressure cylinder that applies tension and pressure, and positioning members provided on both outer sides of each of the clamp members at positions that push side edges that are the inclined sides of the trapezoidal protrusion. A clamping jig for shell plate seam welding, characterized in that when the body plate seam welds become straight and tensioned, each of the positioning members presses the side edge of the protrusion to the desired position during welding and stops. .