JPS6245827Y2 - - 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 welding object guiding device for a seam welding machine that automatically guides an object along a welding line.

(Prior Art) Conventionally, a welding object guiding device for a seam welding machine includes a guide rail that is attached to a seam welding machine body having an upper electrode and a lower electrode, and a ratchet attached to the upper part so as to be retractable, and a seam welding machine body. a rotary table that is movably and rotatably supported by the workpiece and has a shape that matches the welding line of the workpiece; and a rotary table that is attached to the outer periphery of the rotary table and engages with the ratchet to guide the straight part of the welding line. and a half-moon cam pin which is attached to the rotating table so as to coincide with the center of the circular arc portion of the welding line and engages with the guide rail to guide the circular arc portion of the welding line. After placing the workpiece on the table, positioning and fixing it, and sandwiching the workpiece between the upper and lower electrodes, the workpiece is moved along the welding line while being energized and pressurized by both electrodes. There is a device that guides the seam welding process.

Japanese Patent Publication No. 52-22746 discloses a welding object guiding device for welding objects whose arcuate portions of the welding lines are all of the same radius. In addition, as a welding object guidance device for welding objects whose welding line arcs have different radii,
No. 54-3012.

However, none of the above-mentioned workpiece guidance devices have any problem when the welding line of the workpiece has a relatively long straight line, in other words, when the welding line of the workpiece is 100 mm or more. Those with relatively short straight sections, in other words, those with a length of 100 mm or less, have the following problems.

That is, after the copying plate comes into contact with the ratchet and pushes down the ratchet and passes, the ratchet rises and the copying plate is locked by the ratchet, so that the copying plate moves along the welding line of the workpiece to the straight part of the welding line. However, when the copying plate was engaged with the ratchets, the number of ratchets that engaged with the copying plate was drastically reduced, and at the same time, the rotary table on which the copying plate was attached was repelled by the seam welding machine body. As a result, the copying plate does not reliably engage with the ratchet, which hinders smooth guidance of the workpiece along the welding line, resulting in welding defects.

(Purpose of the invention) The purpose of the invention is to develop a seam welding machine that enables extremely good seam welding without causing welding defects even when seam welding relatively short straight sections of 100 mm or less. An object of the present invention is to provide a welding object guiding device.

(Structure of the invention) Therefore, the structure of the invention consists of a rotary board that has a shape that matches the welding line of the workpiece and is movably and rotatably supported by the seam welding machine main body, and a rotating board that is mounted on the seam welding machine main body. A guide rail is provided for guiding the workpiece to be welded along the welding line, and a tracing plate is provided on the outer periphery of the rotary substrate that protrudes from both sides in the thickness direction, and a tracing plate is provided on the upper part of the guide rail. In this case, the main ratchet for locking the copying plate from below is always biased upward and installed so that it can freely protrude and retract, and the auxiliary ratchet for locking the copying plate from above is always biased downward. disposed at an upper position opposite to the main ratchet at the top of the guide rail;
It is characterized by:

(Function) If the auxiliary ratchet, which is always biased downward, is placed above the main ratchet at the top of the guide rail, the main ratchet will move from the bottom of the copying plate to the top of the copying plate. Since it is possible to lock the copying plates at the same time using the auxiliary ratchets, even if the straight part of the weld line of the workpiece is short, such as 100 mm or less, the workpiece can be It is possible to accurately and reliably guide the welding line along the welding line, thereby preventing welding defects and greatly improving welding quality.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. Brackets 2 and 3 are horizontally fixed to a seam welding machine main body 1 in parallel with each other. As shown in FIG. 1, a pair of brackets 4 and 5 are fixed to the bracket 2 side of the seam welding machine main body 1 so as to be spaced apart from each other in the height direction. A link arm 7 is horizontally rotatably connected between the pair of brackets 4 and 5 via a hinge pin 6, and a link arm 9 is connected to the link arm 7 via a hinge pin 8 for horizontal rotation. Connected for free movement.

Reference numeral 10 denotes a rotary base plate rotatably supported on the upper part of the link arm 9. The rotary base plate 10 is formed in a shape that matches the shape of the welding line consisting of a straight line portion and an arcuate portion of the workpieces W and W′ to be welded. ing. Reference numeral 11 denotes a pedestal for placing, positioning and fixing the objects to be welded W, W'. ing.

An upper electrode 13 and a lower electrode 14 are rotatably disposed at appropriate height positions on the seam welding machine main body 1. The upper electrode 13 is a pressurized cylinder device (not shown) fixed to the upper part of the seam welding machine main body 1.
It is provided so as to be movable in the AA′ direction (vertical direction). Further, the lower electrode 14 is supported and fixed by a bracket (not shown) fixed to the seam welding machine main body 1, and is directly connected to a rotational drive source (not shown).

Note that due to wear of the upper electrode 13 and the lower electrode 14, the workpiece W placed on the pedestal 11,
Even if the height of the welded portion W' falls in the direction A' in FIG. 1, the floating mechanism 12 elastically supports the pedestal 11,
The pedestal 11 quickly follows the descent of the welding part.
It is designed to be able to descend in the A′ direction. Therefore, the structure is such that good seam welding can be performed without deforming the workpiece in any way.

Reference numeral 15 denotes an arm fixed at a proper position on the link arm 7, and a hollow bracket 16 is fixed to the horizontal portion of the upper end side of the arm 15 so as to extend in the vertical direction with its axis aligned with the rotary base plate 10. A shaft portion on the upper end side of a clamp member 17 for holding the workpiece W to be welded is fitted into the hollow bracket 16 so as to be vertically movable. A clamp cylinder device 18 is provided for movement in the direction.

Reference numeral 19 denotes a guide rail for guiding the straight part of the welding line of the objects to be welded W, W';
It is fixedly supported horizontally on the tip side. A cam stopper 20 is provided at a suitable position on the guide rail 19. Reference numeral 21 denotes a guide groove formed in the guide rail 19 and extending in the longitudinal direction of the guide rail 19. A main ratchet 22 having an inclined surface 22a and a vertical surface 22b is provided on the upper surface side of the guide rail 19 so as to be retractable.
2 is always resiliently biased upward by biasing means such as a spring (not shown).

Reference numeral 23 denotes an auxiliary ratchet, which, as shown in FIG. 2, is mounted on the guide rail 19 at a location near the vertically curved welding portions of the objects W, W' to be welded. As shown in FIGS. 3 and 4, a bracket 24 is fixed to the upper side of the guide rail 19, and a perforation 24a is formed in the bracket 24 in the horizontal direction.

A base end portion of a ratchet pawl 25 is supported in the bracket 24 via a hinge pin 26 in a perforation 24a so as to be freely rotatable in the vertical direction. A downward inclined surface 25a is provided on the tip side of the ratchet pawl 25.
A vertical surface 25b is formed perpendicular to the horizontal direction, and in particular, the vertical surface 25b is arranged so as to coincide with the vertical surface 22b formed on the main ratchet 22 on the opposing line. In addition, the ratchet claw 25
A horizontal surface 25c is formed on the lower surface side. This horizontal surface 25c makes surface contact with the lower surface of the perforation 24a formed in the bracket 24, thereby regulating the downward rotation of the ratchet pawl 25 about the hinge pin 26 at a desired rotation position. It has a role.

A support member 27 having a screw hole is fixed to the upper part of the bracket 24, and an adjustment bolt 28 is screwed into the screw hole of the support member 27 toward the upper surface of the ratchet pawl 25. A spring (biasing means) 29 is interposed between the adjustment bolt 28 and the upper surface of the ratchet pawl 25 for constantly urging the ratchet pawl 25 to rotate elastically downward. 30 is the adjusting bolt 2
Locknut locks 8, locknut 3
By loosening the adjustment bolt 28 and turning the adjustment bolt 28, the biasing force of the spring 29 against the ratchet pawl 25 can be adjusted to an arbitrary magnitude.

Reference numeral 31 denotes a copying plate having a predetermined vertical dimension, and the copying plate 31 is attached and fixed to the outer periphery of the rotating substrate 10 so as to protrude by a predetermined amount on both sides of the rotating substrate 10 in the thickness direction (vertical direction). There is. This tracing plate 31 is attached to the main ratchet 22 and the auxiliary ratchet 23.
It has the role of engaging with and guiding the straight part of the welding line of the objects W, W' to be welded. 31a is a copying plate 31
The side that enters the guide rail 19 (right side in Figure 4)
When the copying plate 31 engages with the lower surface side of the ratchet claw 25 on the inclined surface formed at the upper end, even if the ratchet claw 25 is slightly tilted downward,
The inclined surface 31a can absorb the inclination of the ratchet pawl 25.

32 is a half-moon cam pin attached to the center of the arc of the welding line of the objects W, W' to be welded on the rotating board 30;
It has the role of engaging with the cam stopper 20 and guiding the arcuate portion of the weld line of the objects to be welded W, W'. The half-moon cam pin 32 is arranged and fixed on the rotating base plate 10 so that the vertical surface of the U-shaped cam groove 32a formed in the half-moon cam pin 32 is parallel to the straight line of the weld line to be welded next.

(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 receiving table 11 and positioned, and the clamp cylinder device 18 is actuated. Then, the workpieces W and W' are reliably clamped by the clamp member 17. Therefore, since the upper electrode 13 and the lower electrode 14 are in an open state (the upper electrode 13 is at the rising end), the pressurizing cylinder device (not shown) disposed at the upper part of the seam welding machine main body 1 ) to lower the upper electrode 13 and lower the upper electrode 13 and lower electrode 14.
The welded parts of the objects to be welded W and W' are held between them (see Figures 1 and 2).

Therefore, seam welding is performed by energizing and pressurizing both electrodes 13 and 14 while rotating them. In FIG. 2, 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 32, which guides the circular arc part to be welded next, is moved to the guide rail 19.
The cam stopper 20 passes through a ratchet (not shown) disposed at an appropriate position in the guide groove 21 of the cam stopper 20.

When the half-moon cam pin 32 comes into contact with the cam stopper 20, a ratchet (not shown) rises to support the half-moon cam pin 32 from behind. Therefore, the half-moon cam pin 32 rotates to a rotational position where the U-shaped cam groove 32a and the cam stopper 20 fit together. That is, the half-moon cam pin 32 serves as the center of rotation to weld the arcuate portions of the weld lines of the objects to be welded W, W'.

As the welding of the arcuate portions of the workpieces W, W' progresses, the tracing plate 31 that guides the straight portion to be welded next moves along the inclined surface 22 formed on the main ratchet 22.
a and the ratchet pawl 25 of the auxiliary ratchet 23
They come into contact with the inclined surfaces 25a formed in the respective directions. After that, the tracing plate 31 is moved to the main ratchet 2.
While gradually pushing down the ratchet 2, the ratchet pawl 25 of the auxiliary ratchet 23 is gradually pushed up.

When the welding of all the arcuate portions of the weld line is completed, the copying plate 31 is moved to the main ratch 22 at the same time.
and the ratchet pawl 25 of the auxiliary ratchet 23, and is securely locked by the vertical surface 22b formed on the main ratchet 22 and the vertical surface 25b formed on the ratchet pawl 25 of the auxiliary ratchet 23, and the welded object The objects to be welded W, W' are guided smoothly with high accuracy along the straight line of the welding lines W, W'.

Hereinafter, the seam welding of the straight and arcuate parts of the weld lines of the objects W, W' to be welded is performed smoothly one after another in this way, and when all the seam welding is completed, one welding cycle is completed. Become.

(Effects of the invention) As explained above, according to the invention, the auxiliary ratchet is disposed at an upper position facing the main ratchet of the guide rail and is always biased downward, and the tracing plate is provided on the outer periphery of the rotating board. is simultaneously locked from the upper and lower sides of the copying plate by the main ratchet and the auxiliary ratchet, respectively, to guide the straight part of the welding line of the workpiece, so even if the welding line of the workpiece Even if it is short, such as less than 100mm,
The copying plate can be reliably locked, and the workpiece to be welded can be guided smoothly and precisely along the weld line, preventing welding defects like conventional ones, improving welding quality, This has the effect of reducing costs and improving production efficiency.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an embodiment of the present invention;
2 is a schematic plan view of FIG. 1, FIG. 3 is an enlarged front view showing the auxiliary ratchet according to the present invention, and FIG. 4 is a partially sectional side view of FIG. 3. 1... Seam welding machine main body, 10... Rotating board,
11... pedestal, 13... upper electrode, 14... lower electrode, 19... guide rail, 22... main ratchet, 23... auxiliary ratchet, 25... ratchet pawl, 29... spring, 31... Copying plate, 32...Half-moon cam pin.

Claims (1)

[Scope of utility model registration request] The work to be welded is held between the upper electrode and the lower electrode,
In a seam welding machine that welds the object to be welded while being energized and pressurized by the two electrodes, the seam welder is movably and rotatably supported by the seam welder main body, and is adapted to the shape of the weld line of the object to be welded. a rotating board having a shape, and provided on the seam welding machine main body,
a guide rail for guiding the object to be welded along a welding line; copying plates are provided on the outer periphery of the rotating board so as to protrude from both sides of the rotating board in the thickness direction; and an upper part of the guide rail; A main ratchet for locking the copying plate from below is always biased upward and mounted so as to be freely protrusive and retractable, and an auxiliary ratchet is always mounted downward at an upper position opposite to the ratchet of the guide rail. A welding object guiding device for a seam welding machine, characterized in that it is biased and arranged.