JPS6327903Y2 - - Google Patents

Description

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

(Prior art) The welding object guiding device of a seam welding machine consists of a guide rail fixed to the seam welding machine main body, which is equipped with an upper electrode and a lower electrode, and a guide rail that is movably and rotatably supported by the seam welding machine main body. It basically consists of a rotary table, a tracing plate and a half-moon cam pin that are attached to the rotary table to guide the straight and circular parts of the weld line of the workpiece, and the workpiece is placed on the rotary table and positioned and fixed. There is a method in which a workpiece is held between an upper electrode and a lower electrode, and then the workpiece is guided along a welding line while being energized and pressurized by both electrodes to perform welding.

However, in all conventional workpiece guidance devices, the guide rail is integrally fixed to the seam welding machine main body, so it is difficult to use the conventional welding object guidance device, which is an airtight container consisting of a main body and a lid, such as a gasoline tank. When seam welding workpieces with a relatively large depth, the upper and lower electrodes become obstacles, and it takes a lot of time to attach and remove the workpieces, reducing production efficiency. It has problems such as difficulty in automation. To prevent this,
Although it is possible to make the stroke of the electrode extremely long, it has become impossible to make the electrode stroke extremely long from a design point of view.

(Purpose of the invention) An object of the invention is to provide a workpiece guidance device for a seam welding machine that solves the above-mentioned problems and allows seam welding to be performed extremely efficiently.

(Structure of the invention) Therefore, the structure of the invention is such that one end of the guide rail for guiding the workpiece is rotatably connected to the seam welding machine main body, and the seam welding machine main body is provided with a sliding surface and a vertical surface. A support member is fixedly installed, the other end of the guide rail is slidably supported on the sliding surface of the support member, and a device for rotating the guide rail is provided between the seam welding machine main body and the other end of the guide rail. It is characterized in that a shift mechanism is provided.

(Function) With this configuration, when attaching or detaching the workpiece, the shift mechanism moves the other end of the guide rail to the opposite side of the seam welding machine body, thereby making it possible to Since the object to be welded can be attached and removed in the separated state, even if the object to be welded, such as a container consisting of a lid and a main body with a large depth, is not obstructed by the two electrodes. The object to be welded can be easily attached and detached without any trouble.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Brackets 2 and 3 are fixed to the seam welding machine main body 1 in a horizontally extending manner. One end of a link arm 6 is rotatably connected between a pair of brackets 4 and 5 fixed to the two sides, and one end of a link arm 7 is connected to the other end of the link arm 6 so as to be horizontally rotatable. ing.

Above a rotary table 8 rotatably supported coaxially with the other end of the link arm 7, a cradle 9 for placing and positioning and fixing the workpieces W, W' to be welded is mounted on a floating mechanism. 10. An upper electrode 11 and a lower electrode 12 are rotatably disposed on the seam welding machine main body 1. The upper electrode 11 is movable in the vertical direction by a pressurizing cylinder device (not shown), and
The lower electrode 12 is configured to be rotationally driven by a drive source (not shown).

Reference numeral 13 indicates an arm fixed to a proper position of the link arm 6, 14 indicates a hollow bracket fixed to the upper end side of the arm 13 so as to extend in the vertical direction, and the bracket 14 includes a clamp member for holding the workpiece W to be welded. 15 is fitted inside so as to be vertically movable. 1
6 is a clamp cylinder device for moving the clamp member 15 up and down.

Reference numeral 17 denotes a guide rail for guiding the objects to be welded W, W' along the welding line. A bracket 18 is fixed to one longitudinal end of the guide rail 17, and the bracket 18 is connected to the bracket by a hinge pin 19. It is rotatably connected to the tip of 2.
Therefore, the guide rail 17 is rotatably connected to the seam welding machine main body 1 at one end thereof.

Reference numeral 20 denotes a sliding surface 20 that supports the other end of the guide rail 17 horizontally in the rotating direction of the guide rail 17.
This support member has a vertical surface 20b and a vertical surface 20b, and is fixed to the tip of the bracket 3. 21 is a bracket fixed to the other end of the guide rail 17.

Reference numeral 22 denotes a shift mechanism for rotating the other end of the guide rail 17 in a horizontal direction about the hinge pin 19 toward and away from the electrodes 11 and 12. 23 is a support arm with a U-shaped cross section whose base is fixed to the bracket 3. A pair of bearings 24, 24' are fixed to the tip side of the support arm 23, as shown in FIG. is a bush attached to the bearings 24, 24'.

26 is a shift cylinder device, and the shift cylinder device 26 is rotatably attached to the support arm 23 via a pair of trunnions 27, 27' installed in the shift cylinder device 26 and the bearings 24, 24'. Connected and supported. 28, 28' are holding plates for preventing the bearings 24, 24' from coming off.

Reference numeral 29 denotes a knuckle attached to the tip of the piston rod 26a of the shift cylinder device 26, and the knuckle 29 is rotatably connected to the bracket 21 via a hinge pin 30. The bracket 31 fixed in place on the nut 29 has a groove 32 attached to it.
One end of the dowel groove 32 is screwed together, and a male screw portion is carved on the outer periphery of the dowel groove 32 over its entire area. Numeral 33 is a lock nut for fastening and fixing the dog rod 32 to the bracket 31, and dogs 34 and 35 are screwed and fixed at appropriate positions in the axial direction of the dog rod 32. Limit switches 36 and 37 are attached to a limit switch mounting plate 38 fixed to the shift cylinder device 26, and have the role of detecting the forward end and backward end of the guide rail 17.

In addition, 39 is a guide groove formed in the guide rail 17, 40 is a cam stopper fixed at a suitable position on the guide rail 17, and 41 is a main ratchet provided on the upper surface of the guide rail 17 so as to be freely retractable. It is constantly biased upward by a spring (not shown). Reference numeral 42 denotes a tracing plate which engages with the main ratchet 41 and guides the straight portion of the weld line of the objects to be welded W, W', and is fixed to the outer periphery of the rotary table 8. Reference numeral 43 denotes a half-moon cam pin for engaging with the cam stopper 40 and guiding the arc portion of the weld line of the objects W, W' to be welded, and is mounted on the rotary table 8 at a position corresponding to the center of the arc of the weld line.

(Operation of the embodiment) To explain the operation of the welding object guiding device configured as described above, each component of the welding object guiding device is It is in its original position. That is, the upper electrode 11
is the rising end (see Figure 1), shift cylinder device 2
6 is in a state in which the piston rod 26a is extended and the dog 35 hits the limit switch 37, the guide rail 17 is in the position shown by the imaginary line 17' in FIG. 2, and the clamp member 15 is at the rising end.

In this state, first, the objects to be welded (in the case of a gasoline tank, the main body and the lid) are placed and positioned on the pedestal 9 and securely clamped with the clamp member 15. Next, when an operation switch (not shown) is turned on, the piston rod 26a of the shift cylinder device 26 retreats in the direction C' in FIG.
The dog 34 hits the limit switch 36 and stops at that position. On the other hand, the guide rail 17 rotates toward the bracket 3 while sliding on the support member 20 using the hinge pin 19 as a fulcrum, and comes into contact with a vertical surface (not shown) formed on the support member 20 and stops. At this time, the workpiece W placed on the pedestal 9,
The welding portion W' enters into the gap between the electrode 11 and the lower electrode 12 (see FIGS. 1 and 2).

When the dog 34 hits the limit switch 36, an activation signal is transmitted, and a pressurizing cylinder device (not shown) installed at the top of the seam welding machine main body 1 is activated to move the upper electrode 11 to position A' in FIG. lower the welded parts of the objects W and W' to the upper electrode
1 and a lower electrode 12.

In this state, the upper electrode 11 and the lower electrode 12 are rotated and energized and pressurized to perform seam welding at a desired welded portion. At that time, the straight part of the weld line is guided by the engagement of the tracing plate 42 and the main ratchet 41, and the arc part of the weld line is connected to the U-shaped cam groove 43a shaped like the half-moon cam pin 43 and the cam stopper 20. The seam weld is guided by the engagement with the seam weld.

In this way, when all the seam welding of the desired welding part (in the case of a gasoline tank, the entire circumference of the flange formed on the main body and the lid) is completed, the pressurizing cylinder device (not shown) is reactivated. It operates to raise the upper electrode 11 in the direction A in FIG. When the upper electrode 11 reaches the rising end, an actuation signal is transmitted, and the shift cylinder device 26 is actuated to move the piston rod 26a of the shift cylinder device 26 to the second position.
The guide rail 1 moves forward in the direction C in the figure.
7 rotates about the hinge pin 19 in the opposite direction to the bracket 3, and the dog 35 hits the limit switch 37 and stops at that position. In other words, it returns to its original position. When the dog 35 hits the limit switch 37, an actuation signal is generated, the clamp cylinder device 16 is actuated, and the clamp member 15 rises to reach the upper end. Finally, the objects to be welded W, W' are removed from the pedestal 9, and one welding cycle is completed.

As mentioned above, when attaching and detaching the objects to be welded W and W', the other end side of the guide rail 17 is moved to the side opposite to the seam welding machine main body 1 and the objects to be welded W and W' are attached and detached. Therefore, even if the object to be welded is a container consisting of a main body and a lid, such as a gasoline tank, and the depth of the main body is relatively large, there will be no interference caused by the upper electrode 11 or the lower electrode 12, etc. It can be directly and quickly attached and detached without any trouble, and the productivity per unit time is significantly improved compared to the conventional method.

In addition, when a loading device and an unloading device are added to the workpiece guiding device of the seam welding machine according to the present invention, fully automatic seam welding can be performed.

(Effects of the invention) As explained above, according to the invention, the workpiece can be attached or detached while the other end of the guide rail is moved to the opposite side of the seam welding machine body using the shift mechanism. Therefore, even if the object to be welded is a container with a large body and lid with a large depth dimension, it can be directly attached and detached without any interference from the upper electrode or lower electrode as in the conventional method. Therefore, the time required to attach and detach objects to be welded is significantly reduced, and production efficiency is improved. Moreover, since the guide rail is supported by a support member, the cylinder device of the shift mechanism only needs to have the ability to slide the guide rail.
It is possible to reduce production costs, and the other end of the guide rail is in contact with the vertical surface of the support member,
Since positioning is performed using the contraction force of the cylinder device, the guide rail can be reliably positioned at a predetermined position, and welding quality can be improved.

[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, and FIG. 3 is an enlarged plan sectional view taken along line BB in FIG. 2. 1...Seam welding machine main body, 8...Rotary table, 11...Upper electrode, 12...Lower electrode, 17
...Guide rail, 22...Shift mechanism, 26...
...Shift cylinder device, W, W'...Object to be welded.

Claims (1)

[Scope of utility model registration request] In a seam welding machine that welds a workpiece held between an upper electrode and a lower electrode while applying current and pressure to the workpiece through both electrodes, the workpiece is guided along the welding line by the seam welding machine main body. One end of the guide rail is rotatably connected to the seam welding machine body, a support member having a sliding surface and a vertical surface is fixed to the seam welding machine main body, and the other end of the guide rail is connected to the support member. for slidingly supporting the guide rail in the rotating direction by a sliding surface of the guide rail, and moving the guide rail in the rotating direction between the seam welding machine main body and the other end of the guide rail. A shift mechanism is disposed, and by operating the shift mechanism, the guide can be rotated and brought into contact with a vertical surface provided on the support member to be positioned with respect to the upper and lower electrode surfaces. A welding object guiding device for a seam welding machine, characterized by: