JPS5944952B2 - Fillet welding equipment for frame structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION When manufacturing a frame structure by attaching a stapler to an I-girder of a bridge or by attaching vertical and horizontal lips to a panel board, the present invention provides a method for using the web material of the I-girder, the stapler, and the panel. This relates to a device that performs horizontal fillet welding of plates, vertical ribs, horizontal ribs, etc.

For example, as shown in FIG.
, 3, depending on the size of the panel, the number of vertical ribs 2 and horizontal lips 3 will be large, and the number of frames 4 formed by these vertical ribs and horizontal lips will also be large.

Therefore, the total length of the horizontal fillet welded portion 5 between the panel substrate 1, the vertical ribs 2, and the horizontal ribs 3 is not extremely long.
There are many corner parts 6 that are difficult to weld, and welding requires a lot of time and effort. This also applies to the case where the lip 12 and the stayer 13 are attached to the I-girder 11 of the bridge as shown in FIG. In view of the above, the present invention provides a fillet welding device that can automatically perform horizontal fillet welding of frame structures with high efficiency.

The present invention will be described in detail below with reference to embodiments shown in the drawings. 3 and 4 show a fillet welding apparatus according to the present invention, where 21 is a gantry (traveling frame) running on a rail 22, and 23 is a transverse rail installed on the horizontal upper beam of the gantry 21. Gantry 21 above 24
A gantry 2 moves on a rail 26 installed on the traversal truck 23, and a gantry 25 moves in a direction perpendicular to the traveling direction of the gantry 2.
This is an auxiliary trolley that runs in the same direction as 1. The gantry 21, the traversing truck 23, and the auxiliary truck 25 are each equipped with a drive motor (not shown). A rotating device 29 is attached to this auxiliary truck 25, and the supporting shaft 3 is connected to the rotating device.
0 is suspended, and a welding head 28 is attached to the lower end of the support shaft. The transverse rail 24 on the gantry 21 may be equipped with a plurality of rails (including the one indicated by the chain line in the illustrated example) as needed.
A welding head 28 is suspended from each carriage in the same manner as described above. The auxiliary trolley 25 is connected to the gantry 21
When a plurality of frames of a frame structure 27 having a large number of frames as shown in FIG. 1 or 2 are simultaneously welded by these plurality of welding heads, the gantry and Used to adjust positional deviation in the running direction. The welding head 28 is rotated in the range of 0 to 3605 by a rotation device 29 disposed on the auxiliary cart 25, and is expanded and contracted by an elevating mechanism 30A attached to a support shaft 30. That is, the power cylinder 3 of the lifting mechanism 30
0a is suspended from a rotating device 29, and a welding head 28 is attached to the lower end of the operating rod 30b of this power cylinder 30a via a connecting member 30c. cylinder 3
The support arm 30f is attached to the lower end of the welding head 28 and supports the guide shaft 30e in a vertically slidable manner.
When the welding head 28 rotates and the elevating mechanism 30A protrudes or pulls back its operating rod 30b, the welding head 28 moves up and down accordingly.

The rotation device 29 includes a rotation angle detector 31, which includes a rotation shaft 29a that has openings or protrusions every 90 degrees and rotates integrally with the support shaft 30.
The rotation angle detection plate 31a attached to the rotation angle detection plate 31a and
The sensor (photoelectric detector or limit switch) 31b detects the opening or protrusion of the a. The welding head 28 is connected to the substrate 2 as shown in FIGS.
8n1 A ball caster 28d1 that is attached to the bottom surface of this board and rolls on the surface of the workpiece to be welded.A bearing 28p is mounted on the board 28n.
, 28q, a pair of guide rods Q8 installed horizontally through
r, which can fit and slide on this guide shaft and has a spring 2
A moving table 28j1 is constantly pressed toward the side of the frame of the object to be welded by 81.A welding torch 28a1 is mounted on this moving table via a target position adjustment mechanism 28b.A welding torch 28a1 is mounted on the mounting space 28k of the mechanism 28b and comes into contact with the side surface of the frame. It consists of a horizontal copying roller 28c and the like.

The substrate 28n is vertically movably mounted on the welding head mounting plate 30d by shafts 288, 28t1 and bearings 30g, 30h. Torch holder 28t of aim position adjustment mechanism 28b
The mounting base 28k is mounted on the guide shaft 28r on the moving table 28j.
It can be moved in the direction, and the amount of movement is 28 m with the adjustment knob.
It can be adjusted by turning.

28h is a support arm that connects the horizontal copying roller 28c to the mounting pace 28k.

Various limit switches are attached to this welding head mechanism, and 28u is a limit switch that detects the lowering limit of the head (Fig. 4), and 28f is a limit switch that detects the appropriate state of contact between the side surface of the frame such as a rib and the horizontal copying roller 28c. Limit switch 28g is a limit switch that detects the side surface of the frame. As shown in FIG. 6, the support arm 28h has a U-shape with a V-shaped tip, and a horizontal copying roller 28c is attached to the apex of the V-shaped tip. Further, the periphery of the substrate 28n forms an arc centered on the rotation center, and as a result, it can be easily rotated without colliding even in a narrow space at the corner of the frame. An electrode wire is supplied from a wire reel 32a (FIG. 3) of a wire feeding device 32 to the welding torch 28a held in the holder 28t. Next, the welding operation will be explained. First, the gantry 21 and the traversing carriage 23 are run to visually locate the welding head 28 above the frame of the workpiece 27 as shown in FIG.
The welding head 28 is lowered by A. Welding head 28
is lowered and the caster 28d is lowered to the lower plate, that is, the panel board 2.
7&, the head 28 can move up and down freely by the guide shaft 30e1 bearing 30f independently of the elevating mechanism 30A, allowing smooth vertical tracing of the head 28 even if the lower plate is uneven. When the operation rod 30b is lowered, the limit switch 28u is activated to stop the lowering operation and then start the frame side surface detection operation. That is, the traversing cart 23 is the torch 28a (horizontal copying roller 28c)
When the horizontal copying roller 28c comes into contact with the vertical rib 27b forming the side surface of the frame and compresses the spring 281 by a predetermined length, the limit switch 28f is activated.
The movement of the traversing cart 23 is stopped. After this, gantry-21
starts the corner detection operation by moving the corner detection limit switch 28g forward, and the horizontal copying roller 28
The horizontal rib 27c is perpendicular to the vertical rib 27b that c is in contact with.
When the limit switch 28g contacts and operates, the movement of the gantry 21 is stopped. Next, the rotation of the welding head 28 by the rotation device 29 begins, and at the same time the torch 28a
A voltage is applied to start horizontal fillet welding. As the welding head 28 rotates, the horizontal tracing roller 28c is pushed forward by the spring 281 and is always in contact with the rib 27b or 27c.

As a result, support arm 28h1 mounting base 28k1 holder 2
The torch 28a, which moves integrally with the roller 28c via the welding part 8t, is also located at a constant distance from the welding part, and during this rotation, horizontal fillet welding of the corner part is performed as desired with a constant exhaust tension. When the rotation angle reaches 90 degrees, the rotation angle detector 31
operates and issues a stop command to the rotating device 29, and at the same time issues a running command to the traversing truck 23. As the traversing cart 23 moves, the fillet welding force 1 of the straight portion along the rib 27c is successively performed. When the corner detection limit switch 28g operates again at the next corner, the welding
8 rotational movement is started, welding continues during this time, 90
After rotation, the rib 2 is moved (backward) by the gantry 21.
Fillet welding is performed on the straight portion along line 7b. These operations are repeated one after another to weld the entire circumference of the frame, and then the welding returns to the welding starting point and the corner detection limit switch 28g is set to 5.
When the second operation is performed, a command to stop welding is issued, and
The movement of the gantry 21} and the carriage 23, and the rotation of the head 28 are stopped.

When the horizontal fillet welding of the entire circumference of the frame is completed as shown by the arrow, the welding head 28 is pulled up from within the frame, the gantry 21 is moved, the welding head 28 is moved to the next frame, and the process is repeated as described above. Perform welding using the following motions. In this way, the horizontal fillet welding of the frame structure is reliably and continuously carried out even in straight sections and corner sections.

However, at the corner, the welding speed gradually increases toward the corner, gradually slows down after the corner, and returns to the original speed at the rotation stop point, so welding is no longer at a constant speed, but this poses a practical problem. If necessary, the rotational speed of the head can be controlled so that the speed of the torch tip remains constant. When two or more sets of welding heads 28 are installed in the apparatus, a plurality of frames can be fillet welded simultaneously using these welding heads.

In this case, the entire assembly is moved simultaneously by the gantry 21, each position shift is adjusted by the individual auxiliary carts 25, and the welding head 2 is moved at the same time.
After performing the alignment shown in step 8, welding is performed in the same manner as described above. One person is sufficient for this operation. In the above description, horizontal fillet welding was performed around the entire circumference of the frame, but the present invention can also be used for welding a part of the frame.

For example, in FIG. 1, it is necessary to weld the entire circumference of the frame at the center of the panel, but at the periphery it is only necessary to weld in a U-shape, and furthermore, at the corners, it is sufficient to weld in an L-shape. Further, as shown in FIG. 2, when the rib 12 and stiffener 13 are attached to the I-girder, the welded portion is linear, L-shaped, or U-shaped. Even in such a case, the apparatus of the present invention can weld only the necessary portion by controlling the welding operation according to the number of detected corners. If one side of the frame is missing, horizontal fillet welding can be performed in the same way by using an auxiliary material to replace the missing piece so that it can be traced. As described in detail above, according to the present invention, the welding head is attached to a rotatable support shaft that is movable in the vertical and horizontal directions, and a copying roller is provided that constantly presses against the workpiece and causes the torch to follow the welding part. Therefore, horizontal fillet welding can be automatically performed on the entire circumference of the frame, including the corner part, or a part thereof, which greatly contributes to labor saving.

It is also possible to install a plurality of sets of welding heads, in which case it becomes possible to weld a plurality of frames at the same time, resulting in further labor savings. In addition, since all of the copying including the corner portions is done by copying the actual product, unlike when using a model, there is no need for the production, installation, position correction, etc. of the model. In addition, the welding head has many advantages, such as being able to fillet weld relatively small frames of about 300wn square, for example, because the periphery of the mounting board forms an arc around the center of rotation and is compact. .

[Brief explanation of the drawing]

Figures 1 and 2 are perspective views illustrating the frame structure;
4 is a side view of the device, FIGS. 5 and 6 are side views and plan views of essential parts of the welding head of the device, and FIG. FIG. 7 is an explanatory diagram of the operation of the device. 21... Gantry 1, 22, 24, 26...
...Rail, 23...Traversing trolley, 25...
...Auxiliary trolley, 27...Object to be welded, 28...
... Welding head, 29 ... Rotating device, 30
......Support shaft, 31...Rotation angle detector.

Claims (1)

[Claims] 1. A gantry that runs over a frame-structured workpiece,
A traverse truck that moves on this gantry in a direction perpendicular to the gantry's traveling direction, an auxiliary truck that moves on this traverse truck in the same direction as the gantry's traveling direction, and a auxiliary truck that can rotate from 0 to 360 degrees attached to this auxiliary truck. a rotating device, a support shaft suspended from the rotating device and extendable and retractable by an elevating mechanism;
A copying roller is attached to the lower end of this support shaft and is constantly pressed by a spring provided on the board to perform horizontal scanning by contacting at least the side surface of the frame of the workpiece. In addition to aiming for
The welding head is equipped with a single welding torch that moves forward at the corner and then retreats to continuously direct the welding area, and controls these gantry, traversing cart, auxiliary cart, and rotating device to allow the welding torch to fully cover the frame. 1. A fillet welding device for a frame structure, comprising a control mechanism for continuously fillet welding the circumference or a part thereof. 2. A fillet of a frame structure according to claim 1, characterized in that a plurality of transverse carriages are placed on a gantry, and each transversal carriage is attached with an auxiliary carriage, a rotating device, a support shaft, and a welding head. Welding equipment. 3. A board on which a welding head is attached to a support shaft so as to be movable up and down, a moving table movably attached to the substrate and always pressed in one direction by a spring, and a mounting base movably attached to the moving table; Fillet welding of a frame structure according to claim 1, characterized in that the substrate includes a torch holder and a horizontal copying roller attached to the mounting base, and the peripheral edge of the substrate forms an arc centered on the center of rotation. Device.