JPS6320468Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is applicable to seam welding an object to be welded consisting of a main body and a lid, such as a gasoline tank for a vehicle. The present invention relates to a workpiece guidance device for a seam welding machine that automatically guides a workpiece along a line.

(Prior Art) Conventionally, as a workpiece guide device disposed in the main body of a seam welding machine, one equipped with a guide rail and a center catch as shown in FIG. 1 is known. 1 is a guide rail, 2 is a guide groove formed in the guide rail 1, and the guide groove 2 is composed of one side wall 3, the other side wall 4, and a bottom portion 5. A plurality of guide ratchets 6 are provided on the upper part of the one side wall 3.
A cam stopper 7 having an arcuate portion 7a is fixed at a proper position on the inner surface of one side wall 3. Reference numeral 8 indicates a stepped portion 8 formed on the other side wall 4. Reference numeral 9 denotes a center hitch having a center hitch claw 10 that appears perpendicularly to the bottom 5 of the guide groove 2, and an inclined surface 1 is provided on the upper part of the center hitch claw 10.
0a is formed. Center hit nail 10
The guide shaft 11 is fixed to the lower part of the guide rail 1, and the bearing 1 is fixed to the casing 13, which is supported and fixed by the bracket 12 fixed to the lower part of the guide rail 1.
4 and 15, and are slidably fitted together. The cap 16 attached to the lower part of the casing 13 includes
Adjustment bolt 1 coaxially with guide shaft 11
7 are screwed together, and the guide shaft 11 is always resiliently biased upward by a spring 18 interposed between the two 11 and 17. In addition, 19 is a collar interposed between the bearings 14 and 15, 20 is a presser plate attached to the upper part of the casing 13, and 21 is a lock nut for locking the adjustment bolt 17.

As described above, since the center chain 9 is attached to the bottom part 5 in the vertical direction, in the case of an external water-cooled seam welding machine, the bottom part 5 and the center chain are connected to each other because welding is performed while applying cooling water to the welded part from the outside. The cooling water and foreign matter such as spatter and electrode chips enter the cooling water and the cooling water together with the slight gap between the center runs 9, impeding the movement of the center chain 9 to move in and out, and causing welding defects.

Further, the half-moon cam pin that guides the arc of the weld line of the workpiece mounted on the rotary table comes into contact with the center catch 9, presses down the center catch pawl 10 and passes through, and then comes into contact with the arc of the cam stopper 7, and at this time. Center hit nail 10
As the half-moon cam pin rises, the half-moon cam pin becomes held between the cam stopper 7 and the center hitch pawl 10,
It rotates at that position to weld the arcuate portion of the workpiece. After that, the straight part is welded and the next circular arc part is welded. When the half-moon cam pin contacts the circular arc part 7a of the cam stopper 7 and rotates, the length of the half-moon cam pin is equal to the weld line to be welded next. Since the half-moon cam pins are formed with different lengths, the half-moon cam pin to which the previous arcuate portion was welded can be removed from the stepped portion of the stepped portion 8. For this reason, the height of the center hitch pawl 10 must be set to a height that can sufficiently support the shortest of the plurality of half-moon cam pins from the rear. This method has problems such as high cost.

(Purpose of the invention) The purpose of the invention is to solve the above-mentioned problems and to provide a welded object guiding device for a seam welding machine that has an extremely simple structure and allows for good seam welding.

(Structure of the invention) The structure of the invention consists of a guide rail for guiding the workpiece, which is provided on the seam welding machine body having an upper electrode and a lower electrode, and a cam stopper is fixed thereon, and a guide rail that is movable and rotatable on the seam welding machine body. and a half-moon cam pin that engages with a cam stopper fixed to one side wall of the guide rail to guide the arc of the welding line of the workpiece. This device is characterized in that the center hitch claw is attached to the half-moon cam pin so that it can come in and out in the horizontal direction so as to be able to come into contact with the half-moon cam pin.

(Function) If the center hitch claw is attached to one side wall of the guide rail so that it can move horizontally, even if it is an externally cooled seam welding machine, the cooling water applied to the welding area and the cooling water mixed in with the Unlike the conventional method, foreign matter does not enter through the small gap between the sliding contact surface of the one side wall and the center hitch pawl, so the center hitch pawl always moves smoothly in and out, eliminating welding defects as in the conventional case. This can be prevented.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 2 to 5. Note that the same components as in FIG. 1 are given the same reference numerals. As shown in FIG. 3, brackets 23 and 24 extend horizontally and are fixed to the external water-cooled seam welding machine main body 22.
One end of a link arm 27 is rotatably connected between a pair of brackets 25 and 26 fixed to the sides, and the other end of the link arm 27 is connected to the link arm 27.
One end of 8 is rotatably connected.

Above the rotary table 29 supported on the upper part of the other end of the link arm 28, a cradle 30 for placing, positioning and fixing the objects to be welded W, W' is elastically supported via a floating mechanism 31. ing. An upper electrode 32 and a lower electrode 33 are rotatably disposed on the seam welding machine main body 22, and the upper electrode 32 is movable vertically by a pressurizing cylinder device (not shown). The electrode 33 is configured to be rotationally driven by a drive source (not shown).

Reference numeral 34 indicates an arm fixed to a proper position of the link arm 27, and reference numeral 35 indicates a hollow bracket fixed to the upper end side of the arm 34 and extending in the vertical direction.The hollow bracket 35 has a clamp member 36 for clamping the workpiece W to be welded. are internally fitted so that they can move up and down.
37 is a clamp cylinder device for moving the clamp member 36 up and down.

1 is a guide rail for guiding the objects W, W' to be welded along the welding line; brackets 23,
24 is supported horizontally on the distal end side. As shown in FIGS. 4 and 5, a guide groove 2 is formed in the guide rail 1. The guide groove 2 includes one side wall 3, the other side wall 4, and a bottom 5 connecting the both side walls 3, 4.

Reference numeral 6 indicates a plurality of guide ratchets arranged on the upper part of one side wall 3; 7 indicates a cam stopper having an arcuate portion 7a and is fixed to the inner surface of one side wall 3; and 8 indicates a step formed at a suitable position on the other side wall 4. Show part.

A perforation 38 having a rectangular cross section is formed in the one side wall 3 of the guide rail 1 in the horizontal direction, and a center hitch pawl 39 having an inclined surface is fitted into the perforation 38 so as to be slidable in the horizontal direction. A lid member 40 is fixed to the outer surface of the one side wall 3 in correspondence with the perforation 38. Between the adjust bolt 41 screwed into the lid member 40 and the center hitch claw 39,
A spring 42 is interposed to constantly urge the center hitch claw 39 toward the other side wall 4, and the elastic force of the spring 42 can be adjusted by an adjuster bolt 41.

43 is a lock nut for locking the adjusting bolt 41; 44 is a chamber formed by the perforation 38, the center hitch claw 39, and the cover member 40; 45 is an air supply port formed at an appropriate location on the cover member 40;
The air supply port 45 is connected and communicated with an air supply source (not shown), so that compressed air can be supplied into the chamber 44 during welding.

Reference numeral 46 designates a tracing plate that engages with the guide ratchet 6 to guide the straight portion of the weld line of the objects to be welded W, W', and is fixedly attached to the outer periphery of the rotary table 29. Reference numeral 47 denotes a half-moon cam pin for engaging with the cam stopper 7 and guiding the arcuate portion of the welding line of the objects to be welded W, W', and is mounted on the rotary table 29 at a position corresponding to the center of the arcuate portion of the welding line. ing. The half-moon cam pin 47 is placed on the rotary table 29 so that the U-shaped cam groove 47a formed in the half-moon cam pin 47 is parallel to the straight line of the weld line to be welded next.
Fixed.

(Operations of the Embodiment) To explain the operation of the welding object guiding device configured in this way, first, the objects to be welded W, W' are placed on the pedestal 30, and the clamp cylinder device 37
The workpiece W to be welded with the clamp member 36
Clamp W′. After this, when the pressurizing cylinder device (not shown) of the upper electrode 32 is turned on,
The upper electrode 32 descends in the direction A' in FIG. 2, and the welded parts of the objects W, W' are sandwiched between the upper electrode 32 and the lower electrode 33.

On the other hand, when the pressurizing cylinder device is turned on, compressed air is supplied into the chamber 44 through the air supply port 45 from an air supply source (not shown). Room 44
The compressed air supplied inside is blown out of the chamber 44 through a small gap between the sliding surface of the perforation 38 and the center launch pawl 39.

Therefore, the electrodes 32 and 33 are rotated while being energized and pressurized to apply cooling water to the welded parts of the welded objects W and W' from the outside while welding the seam of the welded parts of the welded objects W and W'. I'm going to go. In FIG. 3, when the welding of the straight parts of the weld lines of the objects to be welded W, W' is completed, the half-moon cam pin 47, which guides the circular arc part to be welded next, presses down and passes the center hatch pawl 39, and then moves to the cam stop. 7 and rotates to weld the arcuate portions of the objects to be welded W, W'.

Thereafter, the workpieces W, W' are guided by the tracing plate 46 to weld the straight parts, and then the half-moon cam pin 47, which welds the circular arc part, is attached to the circular arc part 7a of the cam stopper 7. When abutting and rotating, the half-moon cam pin 47 touches the stepped portion 8 formed on the other side wall.
It will be removed from the

Thereafter, welding of the straight parts and arcuate parts of the objects W, W' to be welded is performed one after another in this manner, and when all welding is completed, one welding cycle is completed.

Here, the cooling water applied to the welding part of the welded object during the welding cycle and foreign matter such as spatter and electrode chips mixed in the cooling water are removed by a center hitch claw 39 installed horizontally on one side wall 3. Therefore, it is almost impossible for the foreign matter to enter the chamber 44 from between the center hit claw 39 and the perforation 38, and even if the foreign matter tries to enter the chamber 44, the sliding between the center hit claw 39 and the perforation 38 during welding Since compressed air is constantly blown out from the small gap between the surfaces, it is possible to reliably prevent foreign matter from entering.

In the embodiment, if the seam welding machine is an internal water-cooled seam welding machine rather than an external water-cooled seam welding machine, it is not necessary to supply air from the air supply port 42 to the chamber 44.

(Effects of the invention) As described above, in the present invention, the center hitch claw that contacts the half-moon cam pin is attached to one side wall of the guide rail so that it can freely appear and retract in the horizontal direction. A slight difference between the sliding contact surface between one side wall of the rail and the center hitch pawl.
It is possible to reliably prevent foreign matter such as cooling water, spatter, and electrode chips from entering between the welding parts, thereby ensuring smooth movement of the center hitch claws at all times, improving welding quality.

In addition, the height of the center hitch pawl does not need to be set to a height that can support the shortest half-moon cam pin from the rear, unlike in the prior art, so it is possible to downsize the center hitch pawl and reduce manufacturing costs.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway plan view of the main parts of a conventional workpiece guide device showing a guide rail and a center catch, Fig. 2 is a schematic side view showing an embodiment of the present invention, and Fig. 3 is a schematic side view showing an embodiment of the present invention. Schematic plan view of Figure 2, No. 4
This figure is an enlarged front view of the main part of the guide rail shown in FIG. 2, and FIG. 5 is a plan view of the main part shown in FIG. 4 with a part thereof cut away. 1... Guide rail, 3... One side wall, 7... Cam stopper, 22... Seam welding machine body, 29...
... Rotary table, 32 ... Upper electrode, 33 ... Lower electrode, 39 ... Center hitch claw, 47 ...
Half-moon cam pin, W, W′...Object to be welded.

Claims (1)

[Scope of utility model registration request] The work to be welded is held between the upper electrode and the lower electrode,
In the seam welding machine that welds the object to be welded while being energized and pressurized by the two electrodes, the guide is disposed on a seam welding machine body having the upper electrode and the lower electrode, and has a cam stopper fixed thereto. a rail, a rotating table that is movably and rotatably supported by the seam welding machine main body, and a half-moon cam pin that is attached to the rotating table and engages with the cam stopper to guide the arcuate portion of the workpiece. A seam welding machine characterized in that, on one side wall of the guide rail on which the cam stopper is fixed, a center hitch claw is attached so as to be able to come and go in the horizontal direction so as to be able to come into contact with the half-moon cam pin. Workpiece guidance device.