JPS6325023Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a device that performs seam welding fully automatically. More specifically, it automatically receives the work to be welded from a conveyance device such as a roller conveyor, and then welds it to the seam. Relates to a fully automatic copying seam welding machine that clamps the workpiece between electrodes, performs seam welding while rotating the workpiece by driving the electrodes, and then automatically discharges the welded workpiece to the next roller conveyor to be transferred to the next process. .

Conventionally, there has been known a weld line copying device for a seam welding machine equipped with an ejector, such as that described in Japanese Utility Model Application Publication No. 132778/1983.

This type of device uses an X-shaped support link to push up a guide roller that supports the workpiece from below, and when the guide roller is pushed up to a certain height, the rear part of the guide roller goes down and the workpiece is welded. It is designed to allow objects to slide up and down a roller conveyor.

However, in conventional devices of this type, the guide roller attached to the rear of the support link is tilted to follow the curve of the plate cam so that the rear part of the roller guide is lower than the front part. The angle of inclination is determined by the shape of the plate cam, and even if the size of the workpiece changes, this angle of inclination cannot be adjusted arbitrarily. Also,
With this kind of device, the work to be welded cannot be automatically fed using a conveyance device, and the tilting movement of the guide roller is due to the related movement of the X-shaped support link and the plate cam. The number of parts increased, and the structural design tended to become more complex.

The present invention solves the above-mentioned problems and provides a weld line tracing device for a seam welding machine that fully automatically supplies the workpiece to be welded and delivers the workpiece to be welded.

Embodiments of the present invention will be described below based on the drawings.

In FIGS. 1 to 4, 1 is a seam welding machine, and needless to say, the upper (movable side) electrode 1a,
The lower (fixed side) electrode 1b is located on the pressure line of this electrode. 2 refers to the entire seam weld line copying device.

This copying device supports the object to be welded (hereinafter referred to as the tank) in front of the upper and lower seam electrodes.
The flange part F formed in the horizontal plane of the tank T is sandwiched between upper and lower electrodes, and the flange part is guided between the electrodes by rotating the copying device by the rotational movement of the electrodes. It is used for seam welding of automobile gasoline tanks, radiators, oil stove tanks, etc. Reference numeral 3 designates a rotary plate of the copying device 2, which is attached to a bearing 5 at the tip of the link so that it can freely rotate in a horizontal plane by means of an articulated link 4. Reference numeral 3a denotes a workpiece receiving bracket fixed to the rotary plate 3, which receives and supports the lower peripheral edge of the tank fed diagonally from above by a roller conveyor or the like. Reference numeral 6 denotes an ejector lifting cylinder, which is attached to the lower side of the bearing and lifts and lowers the upper plate 7 in the vertical direction.

The upper plate 7 consists of two bars 7a and a large number of support rollers 7b arranged on both sides of the bars, and the bottom surface of the tank T directly contacts the support rollers 7b.

Reference numeral 8 denotes a pivot, which is a bearing 1 of a bracket 16 connected to a rod 6a of an ejector lifting cylinder 6.
The upper plate 7 is inserted into the upper plate 7 and fixed on both sides of the pivot shaft 8, and can rotate about the pivot shaft 8 as a fulcrum.

Reference numeral 9 denotes a guide means, and a guide rod 9a is attached to the lower surface of the bracket 16 symmetrically with respect to the axial center line of the cylinder 6. A guide rod 9a is inserted into a cylindrical body 9b fixed in position to the rotary plate 3, and controls the vertical movement of the ejector. Guide.

A spring 10 is inserted between the bracket 16 and the cylindrical body 9b so as to surround each guide rod 9a, so that the upper plate 7 can float up and down together with the bracket 16 by the force of the spring. .

11 is a stopper means, and a threaded rod 11a is provided on the lower side of the upper plate on the opposite side from the electrode. This threaded rod passes through a stopper piece 11b fixed to the side surface of the cylindrical body 9b, and a nut 11c is provided at its tip. Therefore, when the upper plate 7 rises, this nut 11c moves against the stopper piece 11.
b, the upper plate 7 is rotated about the pivot and tilted. Of course, since the position of the nut 11c can be varied, the inclination angle of the upper plate 7 can be changed as desired. 12 is rotating plate 3
This is a plate cam fixed to the lower surface of the tank, and this plate cam has a similar shape to the welding trajectory n of the tank flange.
It moves between guide rollers 13 and 14 located below the electrode. 15... is a guide pin, this guide pin is fixed at a position corresponding to each corner of the plate cam around the rotating plate, and when the welded straight part of the tank T passes between the electrodes, it is located below the electrode. Enter the fixed guide rail and firmly guide the welding straight section from both sides so that it does not deviate from the normal trajectory.

16 is a roller conveyor on the inlet side, and the tank T is sent while sliding on this conveying device under its own weight. 17 is a roller conveyor on the exit side. Reference numeral 18 indicates a clamping device, which is used to clamp the tank set on the copying device from above so that it does not move.

The operation of the present invention will be explained using the above configuration.
The tank T formed by the combination of the upper tank part ta and the lower tank part tb is first temporarily attached at some places on the flange part by spot welding. The temporarily attached tank T is conveyed on the roller conveyor 16 towards the copying device 2 which has been raised to an intermediate position and is waiting. As shown in FIG. 1A, the tank T that has been sent hits the workpiece receiving bracket 3a diagonally from above with the front side of the workpiece, and then moves horizontally to the guide rollers 7b of the upper plate 7...
ride on top of. In this way, when the tank T rides on the upper plate, the upper plate 7 sinks due to the weight of the tank, as shown in FIG. The flange portion of the tank T rests on the lower electrode. Next, a clamp device 18 descends from above the tank T and clamps the tank T so that it does not move.

Thus, the upper electrode 1a descends and the lower electrode 1b
The flange portion is then sandwiched, and while the copying device 2 is rotated along the welding trajectory by driving the electrodes, a pressing force is applied between the electrodes and a current is passed through the electrodes to start welding.

When welding is finished, the gap between the electrodes is opened and the clamp device 18 is returned to its original position. When the tank T is now opened, the lifting cylinder 6 lifts the tank T together with the upper plate 7 to the uppermost stage. When the tank T is pushed up to the highest stage, the nut 11c of the stopper means 11 is pulled by the stopper piece 11b, and the upper plate 7
The tank T rotates around the pivot 8, and as shown in FIG. The tank T that has fallen onto the roller conveyor 17 slides under its own weight and is sent to the next process. During this time, the copying device 2 lowers the lifting cylinder to wait for the next supply of a new tank T, returns the upper plate 7 to its original intermediate position, and prepares for the next operation.

As described above, the present invention holds an automobile gasoline tank or an kerosene heater tank in front of the upper and lower seam electrodes, rotates them under the electrode drive, and welds the desired weld line between the electrodes. When guiding seam welding, a workpiece that receives and supports the workpiece sent from the conveyor device that feeds the workpiece from diagonally above into the workpiece copying device of the seam welding machine. A receiving bracket, an upper plate on which a plurality of support rollers are arranged to support the lower surface of the workpiece supplied to the bracket, and the upper plate is rotatably supported via a pivot shaft, and the upper plate is vertically raised and lowered. a lifting cylinder for the ejector that is fixed in position, and a guide means that guides the lifting movement of the upper plate, and when the upper plate is raised to the highest stage by the lifting cylinder after welding is completed, the upper plate is raised from a horizontal state to the feeding direction. Since a stopper means for rotating the above-mentioned upper plate about a pivot point and a conveying device for sending out the welded material discharged from the above-mentioned upper plate are installed so that the welding material is lowered, In addition to being able to fully automatically supply the workpiece and the ejector after welding, the structure is simpler than the conventional ejector tracking device mentioned earlier, and the inclination angle of the upper plate can be adjusted to match the workpiece. It can be adjusted as desired, further stabilizes the vertical movement of the upper plate by the guide means, greatly reduces the number of manufacturing steps, and is easy to maintain.

[Brief description of the drawings]

FIG. 1 is a front view including a cross section of a main part showing an embodiment of the device of the present invention, FIG. 2 is a side view, and FIG. 3 is a plan view. FIG. 4 is a schematic plan view when a roller conveyor is used as the conveyance device of the apparatus of the present invention. Explanation of symbols, 1... seam welding machine, 1a... upper electrode, 1b... lower electrode, 2... welding line copying device, 6... lifting cylinder for ejector, 7... upper plate, 8... pivot, 7a... Support roller, 9... Guide means, 11... Stopper means, 16, 17...
...Conveyance device (roller conveyor).

Claims (1)

[Scope of utility model registration request] In the welding object tracing device of a seam welding machine, the workpiece is held in front of the upper and lower seam electrodes, the object is rotated under the electrode drive, and the target welding line is guided between the electrodes to perform seam welding. a conveyance device that feeds the workpiece to the copying device; a workpiece receiving bracket that receives and supports the workpiece sent from the conveyance device in the copying device; An upper plate that supports the lower surface of the supplied workpiece via a plurality of support rollers, and a fixed position ejector that rotatably supports the upper plate via a pivot and raises and lowers it vertically. an elevating cylinder, a guide means for guiding the elevating movement of the upper plate; A fully automatic copy seam welding machine equipped with a stopper means for rotating the upper plate as a fulcrum, and a conveying device for sending out the welded material discharged from the upper plate.