JPH0646625Y2 - Welding object guide device for seam welder - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to an object to be welded whose welding line is a straight line and an arc.
The present invention relates to a welded object guiding device of a seam welding machine, which is sandwiched by an upper electrode and a lower electrode to perform seam welding along the welding line.

(Prior Art) Conventionally, as a welded object guiding device of this type of seam welding machine, there is one shown in FIGS. 4 and 5. In the seam welder main body 1 of this apparatus, one end of a first link arm 2 is rotatably connected to the seam welder main body 1 in a horizontal direction by a hinge pin 3 and the other end of the first link arm 2 is hinge pin. 5, the second link arm 4 is rotatably connected in the horizontal direction, and the second link arm 4 is rotatably rotated about the vertical axis 7 at the end of the second link arm 4 on the side opposite to the first link. Supports the table 6. A copy plate 8 (including the copy plates 8a, 8b, 8c) provided so as to be parallel to the straight line portion of the welding line Wl of the workpiece W is mounted on the rotary table 6. On the upper surface of the rotary table 6, the object to be welded 9
If the object to be welded W is placed on the object to be welded table 9 by fixing the object to be welded, the object to be welded W can be positioned.
The lower surface of the rotary table 6 has a U-shaped cam groove 10a, and the cam groove 10a is arranged at an appropriate position on the lower surface of the rotary table so that the bottom surface of the cam groove 10a is parallel to the straight portion to be welded next. A cam pin (10) whose core is arranged at the center of rotation of the arc-shaped welding line is suspended.

A support arm 11 extending above the rotary table 6 is erected on the second link arm 4, a hollow bracket 12 is fixed to the upper end of the support arm 11, and a vertical axis of the rotary table 6 is attached to the upper end of the hollow bracket 12. The clamp cylinder 13 is fixed so as to be coaxial with 7, and a clamper 14 is fitted to the lower end of the hollow bracket 12 so as to be slidable in the vertical (AA ') direction and rotatable in the horizontal direction. The base end of the clamper 14 is connected to the piston rod of the clamp cylinder 13.

Guide rail support brackets 15 and 16 protruding toward the second link arm 4 side are fixed to the seam welder body 1, and a cam pin 10 hanging down from the lower surface of the rotary table 6 is linearly attached to the support brackets 15 and 16. A guide rail 17 for guiding is fixedly supported. A guide groove 18 opened upward is formed in the guide rail 17, and a lower end portion of the cam pin 10 is fitted to guide the position regulation of the guide pin 10.

On the end face of the guide rail 17 on the side of the second link arm 4, an approach ratchet that can be retracted in place and always urged upward
Plural 19 are arranged. An inclined surface is formed on the entrance side of the cam pin 10 suspended from the rotary table 6 at the upper part of the entrance ratchet 19 so that the cam pin 10 contacts the entrance ratchet 19 and enters the guide groove 18 of the guide rail 17. As it moves in the direction of the guide groove 18, it goes down, and when it passes through the entry ratchet 19 and enters the guide groove 18, it projects and supports the cam pin 10 from the rear. On the guide groove side of the inner wall of the guide rail 17, the cam stopper 20 which enters the cam groove 10a of the cam pin 10 and regulates the position of the cam pin 10 so that the axis of the cam pin 10 is on the extension line of the welding point.
Is protruding. An arc 20a that is substantially equal to the circumference of the cam pin 10 is formed at the contact portion of the cam stopper 20 with the cam pin 10.

A positioning ratchet 21 is mounted on the bottom surface of the guide groove 18 of the guide rail 17 so as to be retractable in the guide groove 18 and always elastically urge upward. An inclined surface is formed on the upper side of the positioning ratchet 21 on the entry side of the cam pin 10. The cam pin 10 that has entered the guide groove 18 moves in the direction D in FIG. As the positioning ratchet 21 sinks as it moves in the direction and comes into contact with the arc 20a of the cam stopper 20, the positioning ratchet 21 projects when passing through the positioning ratchet 21, and supports the cam pin 10 from the rear. . In the guide groove 18 of the guide rail 17, an original position ratchet 22 having the same structure as the positioning ratchet 21 that can freely project and retract and is always elastically urged upward is disposed at a proper position. A plurality of guide ratchets (23) that can be retracted and are always elastically urged upward are arranged at appropriate places on the upper side of the inner wall of the guide rail (17). The guide ratchet 23 has an inclined surface formed on the entry side of the copying plate 8 fixed to the rotary table 6, and when the rotary table 6 rotates, the copying plate 8 comes into contact with the guide ratchet 23 and the copying plate 8 enters. As it goes down, it goes down, and when it passes, it projects and supports the copy plate 8 from the rear.

The cylinder base end portion is rotatably connected to the rotary table side end surface of the welding machine body 1, and the piston rod tip end portion is rotatably connected to the rotary table side end surface of the first link arm 2 so that the first link arm rotation is performed. A rotation assisting cylinder 24 for movement is provided. A pressure cylinder (not shown) fixed to the upper part of the seam welder body 1 is connected to the upper electrode 25 so as to be movable in the AA 'direction in FIG. The lower electrode 26 is connected to a driving source (not shown). The contact point between the upper electrode 25 and the lower electrode 26 becomes the welding point, and the cam pin
A cam pin which is positioned by the cam stopper 20 and the positioning ratchet 21 so that the axis of 10 is an extension line of the contact point of the upper electrode 25 and the lower electrode 26, and the workpiece W is fitted into the guide groove 18 of the guide rail 17. It is linearly guided by 10 and the copy plate 8 engaged with the guide ratchet 23.

The operation of the conventional apparatus having such a configuration is as follows. First, the workpiece W is placed on the workpiece support 9 of the rotary table 6, the clamp cylinder 13 is operated, and the clamper 14 is used to weld the workpiece. Clamp W. At this time, the workpiece W is positioned in the state shown in FIG. That is, the guide rail 17
There is a cam pin 10 in the guide groove 18 of the
One of them contacts the original position ratchet 22 and the rotary table 6
The copying plate 8a fixed to the above is engaged with the guide ratchet 23,
The workpiece W is held at the welding start position (original position). Next, the pressurizing cylinder (not shown) is operated to operate the upper electrode 25.
In the A'direction, the welding line Wl of the workpiece W is sandwiched between the upper electrode 25 and the lower electrode 26, and the lower electrode 26 is rotationally driven to energize and pressurize for welding. The object W is linearly guided in the D direction to weld the straight part of the welding line Wl. At this time, the cam pin 10 located on the guide rail support bracket 16 side moves in the D direction along the guide groove 18, and when it comes to the vicinity of the end of the welding of one direct portion of the welding line Wl, the positioning ratchet 21 is attached. The positioning ratchet 21 is pushed down as they come into contact with each other and the welding further progresses. When the welding of the straight portion is completed, the cam pin 10 passes through the positioning ratchet 21 and comes into contact with the arc 20a of the cam stopper 20 to be locked. Positioning ratchet 21 is a cam pin
When 10 passes, it rises and supports the cam pin 10 from the rear.

As the welding progresses further, the workpiece W is moved to the cam stopper 20.
The cam pin 10 locked to the circular arc 20a is rotated as a center, and the circular arc portion following the straight line portion is welded. When the welding of the arc portion is near the end, the cam pin 10 located in the next arc portion abuts on the entry ratchet 19, and pushes down the entry ratchet 19 as the welding progresses. Passes through the ratchet 19 and enters the guide groove 18. After the cam pin 10 enters the guide groove 18, the entrance ratchet 19 rises to support the cam pin 10 from the rear.

On the other hand, when the arc portion which is rotating and welding the workpiece W approaches the end, the copying plate 8b comes into contact with the guide ratchet 23,
The guide ratchet 23 is pushed down as the welding progresses, and when the welding of the arc portion is completed, that is, the cam pin 10 passes through the approach ratchet 19, and at the same time, it passes through the guide ratchet 23. Simultaneously with the passage of the copying plate 8b through the guide ratchet 23, the guide ratchet 23 ascends and engages with the copying plate 8b. Then, the welding of the continuous portion following the arc portion is executed, and thereafter, the straight portion and the arc portion are sequentially welded along the welding line Wl of the workpiece W by such a procedure.

At the end, welding of the remaining portion of the straight line portion that was welded first is performed again, and at this time, the cam pin 10 that has first entered the cam pin 10 in sequence enters the guide groove 18 and the remaining portion is welded. As the cam advances, the cam pin 10 moves in the D direction, and when the welding of the remaining part is near the end, the preceding cam pin 10 contacts the original position ratchet 22 and pushes down the original position ratchet 22 as the welding progresses. When the welding start point is reached, the original position ratchet 22 passes and the original position ratchet 22 rises. And welding proceeds as it is,
The cam pin 10 which has passed the welding ratchet after passing the welding start point a little and overlapping the welding part
Stops a little away from the original position ratchet 22.

When the welding of the workpiece W is completed, the pressure cylinder (not shown) is activated again to raise the upper electrode 25. Upper electrode
When 25 is raised, the upper electrode 25 and the lower electrode 26 release the object to be welded W, and the rotation assisting cylinder 24 constantly applies a constant pressure to the first link arm 2 in the F direction in FIG. Therefore, the cam pin 10 is retracted in the direction opposite to the direction D until it comes into contact with the original position ratchet 22 to return to the original position. In this way, one cycle of welding the workpiece W is completed.

(Problems to be Solved by the Invention) In the above-mentioned workpiece guiding apparatus, the rotation assisting cylinder is used.
A constant pressure is constantly applied to the first link arm 2 in the F direction by the 24 to smoothly guide the workpiece W along the welding line Wl. For example, in the case of welding from a rotation angle of 5 °) to a straight line portion, there is a problem that the rotation cannot be completed sufficiently, the welding track deviates, and a welding defect occurs. This point will be described in more detail. In FIG. 5, welding proceeds in sequence as described above, the copy plate 8c engages with the guide ratchet 23, and the cam pin 10 engages with the guide groove of the guide rail 17 as shown in FIG.
When the straight line portion of the welding line Wl of the workpiece W is welded by fitting to the line 18, and the welding of the straight line portion is completed, the cam pin 10 immediately before the original position ratchet 22 is aligned with the arc 20a of the cam stopper 20. Welding is performed on the arcuate portion that is in contact with and is following the welding straight portion. At the same time when the welding of the arc portion is completed, the copy plate 8a passes through the guide ratchet 23, engages with the guide ratchet 23, and the subsequent cam pin 10 passes through the entry ratchet 19 and the guide groove 18 of the guide rail 17. , The welding of the subsequent straight line portion of the welding line Wl is performed, but if the rotation angle of the arc portion connecting the straight line portion of the welding line Wl and the subsequent straight line portion is small, the copy plate 8a And the cam pin 10 located on the rear end side of the copy plate 8a cannot pass through the guide ratchet 23 and the approach ratchet 19, respectively,
It deviates from the welding track and causes welding defects.

The object of the present invention was made in view of the above problems,
Provided is a welded object guiding device for a seam welder capable of reliably following the welded object along the welding line with an extremely simple configuration even if the rotation angle of the arcuate welding line of the welded object is small. Especially.

(Means for Solving the Problems) As a means for solving the above problems, the present invention provides a rotary table rotatably and rotatably supported by a seam welding machine body, and the seam welding machine body. And a linear guide rail fixed to the welding table, a welding line on which the welding line is formed from a straight line and an arc is placed on the rotary table, and a copy plate is provided on the periphery of the rotary table in parallel with the straight line. A cam pin, which is attached to the lower part of the rotary table and engageable with the guide rail, hangs down at the center of curvature of the arc, and guides the object to be welded linearly during the welding of the line, and welds the arc. At times, the cam pin is temporarily locked at a specific position near the welded portion, and the workpiece is rotated and guided around the locked cam pin to form an upper electrode and a lower electrode provided on the seam welder body. A seam welding machine configured to perform a seam welding by sandwiching a welding position on the welding line of the workpiece to be welded, wherein the rotation is performed at a position where the cam pin is detached from the guide rail and the rotation table is opposed to the rotation table. A rotation assisting device, which is disposed so as to be able to approach and separate from the peripheral edge of the table and has a push rod that presses the copying plate when welding the arc of the welding line, and a drive unit that drives the push rod, is fixed. Is characterized by.

(Operation) Since the present invention is configured as described above, the object to be welded is placed on the rotary table and the straight lines and arcs of the welding line are continuously welded. Move linearly along or rotate.

When welding the arc portion of the work piece, the rotary table is rotated, but when the arc angle of the welding line is small, the subsequent rotational movement is burdened, but the push rod is projected toward the rotary table and pushed. The bar presses the copy plate on the outer peripheral portion of the rotary table. As a result, the straight line and rotary movement of the rotary table become smooth, and the break points of the welding line can be eliminated.

(Embodiment) Hereinafter, an apparatus for guiding an object to be welded of a seam welder according to the present invention will be described with reference to FIGS. 1 to 3. In addition, the same reference numerals are given to those common to the above-mentioned prior art device,
The description is omitted.

The drive cylinder 31 of the rotation assisting device 30 is attached to the guide rail 17 attached to the seam welder main body 1 via the bracket 32.
It is fixedly supported on the rotary table 6 in the direction of rotation from the welding position. The piston rod 31a of the drive cylinder 31 is expanded and contracted toward the rotary table 6 side.

A push rod 33 is fixed to the tip of the piston rod 31a, and a push roller 34 is provided on the push rod 33 so as to face the copying plate 8 provided on the rotary table 6, and the push roller 34 has a hinge pin 35.
It is made rotatable by. Further, the push rod 33 is provided on the bracket 32 to assist the operation of the piston rod 31a.
A guide bar 36 inserted into a holder 37 fixed to the is connected.

The operation of the present invention constructed as described above will be described only in the case of welding a straight line portion from a circular arc portion having a small rotation angle to a circular arc portion having a small rotation angle.

Welding proceeds in the same manner as the above-mentioned conventional technique, and the copy plate
8c is engaged with the guide ratchet 23, and the cam pin 10 (hereinafter referred to as 10E as shown in FIG. 3) at a position close to the front arc portion of the copying plate 8c, the copying plate 8c and the copying plate 8a. When the cam pin 10 between them (hereinafter referred to as 10A as shown in FIG. 3) is fitted into the guide groove 18 of the guide rail 17, the workpiece W is moved to Welding line Wl
The linear portion is welded while being guided along, and when the welding of the linear portion is completed, the cam pin 20A abuts on the arc portion 20a of the stopper 20 and is locked. Cam pin 20A locked
Welding of circular arcs with a small rotation angle around
When the welding is near the end, the drive cylinder 31 of the rotation assist device 30 is activated, and the piston rod 31 of the drive cylinder 31 is activated.
a is extended, and the push rod 33 is advanced. When the push rod 33 moves forward, the push roller 34 rotatably mounted on the push rod 33 moves forward and moves to the position of the push roller 34 'shown by the phantom line, and the rotary table 6 rotates. Direction to accelerate the rotation of the rotary table 6. Therefore, the copying plate 8a surely passes through the guide ratchet 23 at the same time when the welding of the arc portion having a small rotation angle is completed, is engaged with the guide ratchet 23, and is located between the copying plate 8a and the copying plate 8b. Cam pin 10 (hereinafter as shown in FIG. 3
(Displayed as 10B) has definitely passed the approach ratchet 19,
The linear portion that fits in the guide groove 18 of the guide rail 17 and follows the arc portion having a small rotation angle is welded.

On the other hand, the copy plate 8a passes through the guide ratchet 23, engages with the guide ratchet 23, the cam pin 10B passes through the entry ratchet 19, fits into the guide groove 18 of the guide rail 17, and at the same time the rotation assist device 30 The drive cylinder 31 operates,
The piston rod 31a of the cylinder 31 is shortened, and the push rod 33
To the original position. That is, the pressing force of the rotary table 6 by the pressing roller 34 is released. Drive cylinder
The operation of 31 is set beforehand using a timer.

After that, the conventional seam welding is sequentially executed, and the workpiece W
All welding is completed.

As described above, according to the present invention, it is difficult to guide an object to be welded in a conventional seam welding machine guide device by guiding the object from a circular portion having a small rotation angle to a straight portion. Since the rotary table 6 can be easily rotated by the auxiliary device 30, the welding line can be smoothly formed from an arc to a straight line, and good quality seam welding can be performed. Good quality seam welding can be performed, and
Since the rotation assisting device that assists the rotation of the turntable has a simple structure, it can be easily attached to the welding object guide device of the conventional seam welding machine, and requires a special installation space that requires a large installation area. It produces the effect of not

(Effect of the Invention) As described above, according to the present invention, the workpiece guiding device of the seam welder is connected to the guide rail at a proper position, the base end portion is connected to the drive cylinder, and the piston rod of the drive cylinder. A rotation assisting device including a push rod rotatably mounted on the rotary table is fixed to the rotary table by the rotation assisting device at the end of welding of the arc portion of the welding line when welding the arc portion of the welding line. Since it is possible to provide a high-quality seam welding, it is possible to reliably guide from a circular arc part with a small rotation angle to a straight part, and the subsequent cam pin can be used as a guide ratchet or an approach ratchet. It is possible to prevent the occurrence of a welding defect that is not able to pass through the welding path and deviates from the welding track. Also, since the rotation assist device is installed at a position where it does not interfere with the arm holding the rotary table,
It is very easily adaptable to all seam welders of this kind. Further, since the mounting position is outside and the structure is simple, maintenance work is easy and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a partially enlarged plan view showing a rotation assisting device according to the present invention, FIG. 2 is a side view showing a rotation assisting device according to the present invention, and FIG. 3 is a plan view of a workpiece guide device of a seam welding machine according to the present invention. FIG. 4 is a side view showing a conventional welded object guiding device for a seam welder, and FIG. 5 is a plan view showing a conventional welded object guiding device for a seam welder. 17 …… Guide rail 30 …… Rotation auxiliary device 31 …… Drive cylinder 32 …… Bracket 33 …… Push rod 34 …… Push roller 35 …… Hinge pin 36 …… Guide bar 37 …… Holder

Claims (1)

[Scope of utility model registration request] 1. A rotary table supported horizontally and rotatably with respect to a seam welder body, and a linear guide rail fixed to the seam welder body, wherein a welding line is provided on the rotary table. An object to be welded formed of a straight line and a circular arc is placed, a copying plate is attached to the periphery of the rotary table in parallel with the straight line, and a cam pin engageable with the guide rail is provided under the rotary table. It hangs down to the center of curvature of the arc, linearly guides the object to be welded when the straight line is welded, and temporarily locks the cam pin at a specific position near the welded portion when the arc is welded. Inducing rotation of the object to be welded around the cam pin,
A seam welder, which is provided in the main body of the seam welder, for performing seam welding by sandwiching a welding position on a welding line of an object to be welded by an upper electrode and a lower electrode, wherein detachment of the cam pin of the guide rail is performed. On the side and at a position facing the rotary table, a push rod arranged to be able to approach and separate from the rotary table peripheral edge, for pushing the copying plate when welding the arc of the welding line, and the push rod. A welding assisting device for a seam welding machine, characterized in that a rotation assisting device having driving means for driving is fixed.