JPS6352773A - Welding gun device - Google Patents

Abstract

PURPOSE:To reduce size of the structure of the titled device and to weld plural places with one welding gun by forming 1 transformer and the welding gun separately and making the transformer connectable with the welding gun a by a contact terminal connected with the transformer and a clamp arm connected with the welding gun. CONSTITUTION:The transformer 22 and the welding gun 12 are formed separately and the welding gun 12 is made movable and the transformer 22 is made connectable with the welding gun 12 by the band-shaped contact terminal 26 connected with the transformer 22 and the clamp arm 30 which is connected with the welding gun 12 and can be opened and closed. In this way, both terminal parts of the contact terminal 26 are held in-between by closing the clamp arm 30 and an electric current is supplied from the transformer 22 to the welding gun 12 to perform the welding. On the other hand, when the clamp arm is released, the rel.eased position is maintained by a stopper means and the welding gun 12 is moved till the prescribed position without the malfunctioning.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a welding gun device, and more specifically to a device capable of welding multiple locations with one device.

(Prior Art) A conventional welding gun device connects a welding gun having a pair of electrodes to a transformer via a cable, holds a workpiece to be welded between both electrodes provided in the welding gun, and then connects the welding gun to the transformer. Welding was performed by passing an electric current between the two.

When the position of the electrode is fixed and only the same location on the workpiece is to be welded, it is sufficient to use one of the above devices without any problem. However, if we consider the case where this welding device is used, for example, when assembling the body of a vehicle, in such a case, the workpiece is large and there are multiple welding points over a wide range on one workpiece, so it is not possible to use one device as is. It's gone. That is, since the transformer that supplies current to both electrodes of the welding gun is very heavy and large, it is not possible to move the device together with the transformer to perform welding depending on the welding location.

Therefore, when welding multiple different locations on the workpiece,
Conventionally, for example, Japanese Patent Publication No. 58-8 proposed by the applicant of the present application
There was a spot welding device shown in Japanese Patent No. 952. This invention provides a jig table with a plurality of welding guns each having a pair of movable electrodes and a fixed electrode corresponding to the welding location of the workpiece,
On the other hand, the welding guns are arranged so as to surround the plurality of welding guns, and 1=
When the contact gun connected to the transformer is moved on the doll housing and moved to a position close to the welding gun driven by the contact gun, the contact gun clamps both electrodes. Welding is performed by supplying current from the transformer to both electrodes.

However, this device requires a plurality of welding guns and has the problem of increasing the size of the device.

On the other hand, if only one welding gun is used, a possible method would be to connect the i-lance and the welding gun using a long cable and move only the welding gun to weld a predetermined position on the workpiece. . However, according to this method, since the couple is long, there is a risk that the cable may be bent or cut in the middle.

In particular, when the welding gun is moved, there is a high possibility that it will get caught in surrounding equipment, tools, etc., making the above problem even worse.

This invention was made in view of the above-mentioned problems.
The purpose is to provide a welding gun device that can weld a plurality of different locations on a workpiece without using a long cable and with a single welding gun.

(Means for Solving the Problems) In order to achieve the above object, in the welding gun device according to the present invention, the welding gun is placed on a movable table and installed in such a way that it can grip the welding part of the workpiece. , a contact terminal which is provided close to the movable table in the direction of movement and to which current is supplied from the lance for driving the welding gun, and a contact terminal which is placed on the movable table and is connected to the welding gun via a cable. The contact terminal has a pair of positive and negative terminal parts installed in a layered manner in an insulated state, while the clamp arm is connected to the first contact terminal. ．． having a second arm portion;
Part 1. The second arm part is pivotally connected to a support member fixed to the movable base, and the first arm part is provided with a cylinder, and the second arm part is provided with a cylinder. The rods of the cylinders are connected to each other so as to be openable and closable, and the first. The inner side of the second arm is attached to the first arm when the clamp arm is released. Stopper means are provided to allow the second arm to be fixed.

(Function) The transformer and welding gun are formed separately, the welding gun is movable, and the belt-shaped contact terminal connected to the lance and the openable/closable lamp arm connected to the welding gun are connected to the welding gun. Toyotsu-C transformer and welding gun can be connected, so by closing the clamp arm, you can clamp both terminals of the terminal and supply current from the transformer to the welding gun to perform welding. Can be done.

On the other hand, when the clamp arm is opened, the stopper means provided on the clamp arm causes the first stop. The second arm part does not come into contact with both terminal parts and can reliably maintain the open position. As a result, the welding gun can be moved to a predetermined position without causing malfunction.

Next, welding can be performed by closing the clamp arm again and clamping both terminal portions of the contact terminal.

Furthermore, since the clamp arm is swingable, even if the terminal is placed off the center of the clamp arm (C), the clamp arm will tilt accordingly, ensuring a secure It can be held between.

(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

First, as shown in FIG. 1, the welding gun 12 disposed on the movable base 10 engages with the slide rail 1.
It is movably arranged along the line 4. This welding gun 1
2 has a pair of electrodes 16-16, one of which is connected to a cylinder 18, and is movable back and forth. Welding is performed by sandwiching two workpieces 20-20 to be welded between both electrodes 16-16.

Note that the workpiece 20-20 is positioned and fixed at a predetermined position by a jig (not shown).

Further, the welding gun 12 can be moved to a predetermined position by moving the movable base 10 by a motor (not shown).

On the other hand, a transformer 22, which is a power source for driving the welding gun 12, is disposed separately from the welding gun 12 and is immovable. This transformer 22 is connected to the primary cable 24-
It is connected to a contact terminal 26 via 24. This contact terminal 26 is a pair of elongated strip-shaped terminals 26.
It is formed in a layered manner with an insulating layer 26G interposed between a and 26b. That is, both terminal portions 26a and 26b connect to the positive electrode of the transformer 22 via the primary cable 24-24.

Connected to negative pole. Further, the contact terminal 26 is mounted on the mounting base 26 so that both terminal portions 26a and 26b are vertically arranged.
is fixed and placed horizontally to the ground.

In the state in which the contact terminal 26 is disposed, the contact terminal 26 and the slide rail 14 that guides the movement of the welding gun 12 described above are arranged substantially parallel to each other and close to each other.

Further, in the present invention, the contact terminal 26 connected to the transformer 22 and the welding gun 12 are connected by a clamp arm 30 that is integrally disposed on the welding gun 12.

That is, this clamp arm 30 is shown in FIG.

As shown in an enlarged view in FIG. 3, it has a first arm part 32 and a second arm part 34. And the first. Pivot parts 32a and 34a, which are formed integrally and protrude from the centrally opposing side surfaces of the second arm parts 32 and 34, are pivotally connected from both sides by the tip parts 36a of a pair of substantially horizontal T-shaped support members 36. and can swing freely relative to each other. Further, the rear end portion of the support member 36 is bent downward and fixed on the movable table 10 described above, and the welding gun 1 is separately arranged on the movable table 10.
2 can be moved at the same time.

Further, an air cylinder 3 is provided at the rear end of the first arm portion 32.
8 is disposed, and the tip of a rod 40 interlocked with this air cylinder 38 is pivotally attached to the rear end of the second arm 34. As a result, the first. Second arm portion 32
．． 34 is a rod 4 driven by an air cylinder 38
The pivot parts 32a and 34a are opened and closed by the expansion and contraction of 0. And the first. Second arm part 3
At the tip of the first 2.degree. 34, holding portions 32b and 34b are formed to protrude inward. Second arm portion 32
．． Both clamping parts 32b when 34 is closed.

Both electrodes 36a, 3 of the contact terminal 36 are connected by 34b.
6b is held in a press-contact state. and,
Although not shown, a pair of secondary cables are connected to the rear ends of both the clamping parts 32b, 34b, and the secondary cables connect the clamping parts 32b, 34. b and both electrodes 16-16 of the welding gun 12 are connected. As a result, as described above, both the holding parts 32b and 34b are connected to the contact terminal 36.
When the terminals 36a and 36b of the transformer 2 are pressed together,
2 supplies current to both electrodes 16-16, making welding possible.

On the other hand, the first. Pivot parts 32a, 34. provided on the second arm part 32.34. Locking pins 32C, 34, and C, which are stopper means, are respectively formed protruding from the rear of the first. When the second arm portions 32, 34 are open, both locking pins 32c, 34c come into contact with a locking member 42 arranged on the inner side of the support member 36.

Furthermore, in this embodiment, the first. While the second arm portion 32° 34 maintains an opening angle corresponding to the amount of protrusion of the rod 40,
It is formed so that it can swing up and down about the pivot parts 32a and 34a.

Next, to explain the effects of this embodiment, first, the first
As shown in FIG. Second arm portion 32.
34 is closed, the clamping part 32b provided at the tip thereof,
34. b clamps and presses the contact terminal 26,
Current supplied from the transformer 22 is supplied to the welding gun 12.

Next, when stopping the driving of the welding gun 12 from this state and moving it to another location, the cylinder 3B provided on the first arm portion 32 is activated to contract the τ rod 40,
The first part is centered around the pivot parts 32a and 34a. Second arm part 3
2. Open the tip of 34. At this time, the first. Second
The arm portions 32, 34 of the pivot portion 32a maintain the opening angle corresponding to the amount of protrusion of the rod 40 as described above.
.

Since it is formed so that it can swing up and down about the crank arm 34a, the first. Either one of the clamping parts 32b, 34b provided on the second arm part 32.34 (if the second
While the gripping part 34b provided on the arm part 34 of the first arm 34 remains in contact with the terminal parts 26b of the opposing contacts 1 to 26, the gripping part 32b of the first arm part 32 on the opposite side contacts the terminal part 26a. They become separated and liberated. As the rod 40 contracts, the tip of the locking pin 32C provided on the first arm portion 32 comes into contact with the locking member 42 provided inside the support member 36. Subsequent opening of the first arm portion 32 is suppressed. From this state, when the rod 40 roughly contracts, the first arm section 32 is no longer opened, so the second arm section 34 begins to open. As shown in FIG. Second arm portion 32
, 34 are both locked with the locking member 42, so that the clamp arm 30 is connected to the terminal 26 at both terminal portions 26a of the terminal 26.

26b will remain open without contacting any of them.

Then, by moving the movable base 10 along the slide rail 14 while keeping the crank arm 30 open, the welding gun 12 and the clamp arm 30 are moved to a predetermined position.

Next, by performing the reverse operation described above, that is, by extending the rod 40, the first. Second arm portion 32.
34, for example, the second arm portion 34 begins to close and comes into contact with the terminal portion 26b, and the first arm portion 32 begins to close and closes again as shown in FIG.
grips the contact terminal 26 and supplies current to the welding gun 12 to weld a predetermined location on the workpiece. At this time, even if the contact terminal 26 is disposed offset in one direction in the vertical direction, the clamp arm 30 is provided so as to be able to swing around both pivot parts 32a and 34a.
The clamp arm 30 also tilts in accordance with the positional shift of the contact terminal 26, and the first. Both clamping parts 32b provided on the second arm part 32.34.

3. Securely sandwich both terminal parts 26a and 26b with the lb, and apply the current supplied from 1 to lance 22 to the welding gun 12.
can be supplied to

In other words, the clamp arm 30 that pulls the present device has a clamping section 32 b provided on the first and second arm sections 32 and 34.
+' 34. b maintains the closed position by clamping the contact terminal 26 in a press-contact state, and the locking pin 32G
, 3'1. C holds the locking member 42 to maintain the open position.

In the above embodiment, the contacts 1 to 26 are placed horizontally, and the first and second arms 32 and 34 of the crank arm 30 are arranged vertically, but the present invention is not limited to this, and the above Any arrangement other than the arrangement in the embodiment is possible.

Further, although the above embodiments have been described using only one welding gun and one clamp device, the present invention is not necessarily limited to only one, and a plurality of welding guns and clamp devices may be provided. In that case, the welding work can be performed more easily and quickly, and even in such a case, the structure is simpler and smaller than the conventional device.

Furthermore, although guide rails are used as means for transporting the welding guns and the like in the above embodiments, it goes without saying that other means for transporting may be used.

(Effects of the Invention) As described above, according to the welding gun device according to the present invention, the transformer and the welding gun are separately formed, the welding gun is movable, and the belt shape connected to the transformer is made movable. By making it possible to connect the transformer and welding gun using the contact terminal of It can be welded with it.

In addition, since the clamp arm is attached to the support member so that the second arm part can swing freely, even if the contact terminal is in the first position. Even if it is not in the middle position of the second arm part,
Both terminal portions of the contact terminal can be reliably clamped in a press-contact state, and there is no risk of welding failure due to poor contact.

Furthermore, the first. A locking pin is provided on the second arm portion, and when the clamp arm is open, the locking member is held between both locking pins, so that when the clamp arm is opened, the locking member is held between the first and second arm portions. Second
There is no risk that one of the arm parts of the contact terminal will come into contact with the terminal part of the opposing contact terminal, and it can reliably maintain an open state away from both terminal parts, ensuring that it is placed only in the desired position without malfunction. Can perform welding.

[Brief explanation of the drawing]

FIG. 1 is a side view showing one embodiment of a welding gun device according to the present invention, and FIGS. 2 and 3 are enlarged side views of essential parts to explain its operation. 12... Welding gun 16... Electrode 20...
Workpiece 22...Transformer 26...Contact terminal 30...Clamp arm 32...First arm part 32c...Locking bin 34...Second arm part 34c...Locking bin 36...Supporting member
42...Locking member patent applicant Mazda Co., Ltd. Agent Patent attorney - Kensuke Iro Patent attorney Usuri Matsumoto Figure 2 Figure 3

Claims (1)

[Claims] A welding gun is placed on a movable table and is provided so as to be able to grip the welding part of the workpiece, and a transformer that is disposed adjacent to the movable table in the moving direction and for driving the welding gun receives current from the welding gun. It consists of a supplied contact terminal, and a clamp arm placed on the movable table and connected to the welding gun via a cable, and arranged so as to be connectable to the contact terminal, and the contact terminal has a positive and a negative pair. terminal portions are provided in a layered manner in an insulated state, while the clamp arm has first and second arm portions;
The arm portion is pivotally attached to a support member fixed on the movable table so as to be swingable, and the first arm portion is provided with a cylinder, and the second arm portion is connected to a rod of the cylinder. is formed to be openable and closable, and the first and second
When the clamp arm is opened, the first,
A welding gun device comprising a stopper means for fixing the second arm.