JP2524347Y2 - Welding head with balance mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention automatically adjusts the pressing force of an electrode to a first metal plate and a second metal plate when the first metal plate and the second metal plate are welded, and easily changes the electrode interval. The present invention relates to a welding head with a balance mechanism configured to be able to perform the welding.

[0002]

2. Description of the Related Art In resistance welding, after a metal surface to be welded is brought into contact with each other, a large current is applied while mechanically pressing the metal surface, and Joule heat is generated by contact resistance of a metal portion through which the current passes. The generation causes a rapid rise in temperature near the contact portion, and as a result, the molten state of the metal part is obtained, and the metal part is welded together with the pressing force. In particular, when a metal plate having an insulating coating on one surface and another metal plate are overlapped and welded, a pair of electrodes having sharpened tips are used, and the electrodes are separated by a predetermined distance and pressurized. Welding is performed using a welding head with a balance mechanism that is brought into contact, and the technical idea is disclosed in, for example, Japanese Utility Model Publication No. 3-7092 filed by the present applicant.

As shown in FIG. 3, a welding head 2 with a balance mechanism according to the prior art includes an equalizer 8 supported on a shaft 6 formed above a body 4 and a lower surface of the equalizer 8. It comprises a pair of slide shafts 10a and 10b fitted in the body 4. Electrode holders 14a, 1b having sharpened electrodes 12a, 12b at their lower ends are provided on the slide shafts 10a, 10b.
4b is attached with a bolt 16 or the like, and an equalizer 8 is provided at the upper end.
18a, 18 rotatably supported in contact with the lower surface of
b is provided.

In the welding head 2 with a balance mechanism, first, the electrodes 12a and 12b are brought into contact with the metal to be welded to equalize the pressure difference between the slide shafts 10a and 10b by the equalizer 8, and then the electrode is applied by applying pressure. 12
The welding current flows from a and 12b. Therefore, desired resistance welding is performed under a constant pressure.

[0005]

[Problem to be solved by the present invention]
This relates to a welding head with a balance mechanism disclosed in Japanese Patent No. 7092, in which rollers are rotatably mounted on both ends of a swingable equalizer, and a slide shaft is rotated about an axial direction. An object of the present invention is to provide a welding head with a balance mechanism in which the distance between a pair of electrodes can be adjusted to be freely displaceable.

[0006]

In order to achieve the above object, the present invention provides a first slide shaft and a second slide shaft having one end connected to a first electrode and a second electrode, respectively. A slide shaft, a body portion for fitting and holding the first slide shaft and the second slide shaft, and a first roller and a second roller fixed to both ends of the body so as to be swingable.
And an equalizer section to which the other rollers are attached, respectively, and the other end of the first slide shaft contacts the first roller of the equalizer section, while the other end of the second slide shaft contacts the second roller. The parts are abutted.

[0007]

[Function] In the welding head with the balance mechanism according to the present invention,
In a state where the first roller and the second roller attached to the equalizer portion are in contact with the first slide shaft and the second slide shaft, respectively, the first slide shaft and the second slide shaft are aligned with each other. The first electrode and the second electrode can be easily adjusted.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a welding head with a balance mechanism according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 20 denotes a welding head with a balance mechanism according to this embodiment. The welding head 20 with a balance mechanism is provided with a first slide shaft 22.
a, a body 24 for slidably holding the second slide shaft 22b, a first roller 26a, and a second roller 26b
Equalizer section 28 for supporting the first electrode 30a, the second
It is basically composed of an electrode part 32 to which the electrode 30b is attached.

As can be seen from the drawing, the body portion 24 is formed from a substantially central portion of the upper part of the rectangular parallelepiped body 34 to the shaft portion 3.
6 is directed upward and its upper end is cut into two branches. An equalizer 28 is attached to the bifurcated holding portion.
Are swingably supported. In this case, holes 35 a and 35 b are defined on both sides of the shaft 36 along the vertical direction of the body 34.

The equalizer section 28 has a flat plate body, which is formed by cutting both ends of an equalizer 38 into two forks to define a holding section. The first roller 26a and the second roller 26b are rotatably mounted on the holding section. Be pivoted. If the equalizer 38 is formed of a lightweight member such as aluminum, the weight of the apparatus can be reduced as a whole.

The first roller 26a and the second roller 2
The first slide shaft 22a and the second slide shaft 22b are made to face 6b. That is, the first slide shaft 22a and the second slide shaft 22b are
4 are slidably fitted into the holes 35a and 35b, and are constantly urged upward by a coil spring (not shown). In the drawing, a flat portion 4 is provided on the upper end surface, facing the first roller 26a and the second roller 26b provided on the equalizer 38.
0a and 40b are formed. Insulating collars 42a, 42b are provided at the lower ends of the first slide shaft 22a and the second slide shaft 22b projecting downward from the bottom of the body 34.
The electrode holders 44a and 44b are attached via the. Each of the electrode holders 44a and 44b is a rectangular metal body made of a conductor. Slots 46a and 46b are formed at the respective ends of the electrode holders 44a and 44b, and the first electrode 30a and the second electrode 30b having the sharpened ends are respectively provided. Hold.

In the drawing, reference numeral 50 denotes an arm for moving the body 34 up and down, and reference numerals 52a and 52b
Is a terminal for supplying a welding current to the electrodes 30a and 30b from a power source (not shown).

Next, the operation of the welding head 20 with the balance mechanism configured as described above will be described.

First, the arm 50 is lowered and the first electrode 3
0a, the sharpened tip of the second electrode 30b is brought into contact with the metal to be welded. As a result, the first slide shaft 22a and the second slide shaft 22b slightly rise due to the reaction force, and the flat portions 40a and 40b formed on the first slide shaft 22a and the second slide shaft 22b are connected to the first slide shaft 22a of the equalizer 38. It comes into contact with the roller 26a and the second roller 26b with a slight frictional force. First electrode 30a, second electrode 30
When the pressures transmitted through b are different from each other, the equalizer 38 swings around its support shaft to swing the first slide shaft 22a and the second slide shaft 22b,
Absorb the pressure difference. At this time, since the first roller 26a and the second roller 26b are in contact with the flat portions 40a and 40b by rolling friction, the pressure difference is accurately transmitted to the equalizer 38, and the pressure is balanced.

Next, a further pressure is applied through the arm 50, and when a predetermined pressure is reached, a welding current is caused to flow from the tips of the first electrode 30a and the second electrode 30b so that a desired pressure can be obtained under the pressure. Resistance welding will be performed.

When changing the distance between the first electrode 30a and the second electrode 30b, that is, when changing the welding location,
First slide shaft 22a, second slide shaft 2
2b is rotated about the axis using a hand or a jig. Then, since the flat portions 40a and 40b of the first slide shaft 22a and the second slide shaft 22b are in contact with the first roller 26a and the second roller 26b with a small frictional force, the first slide shaft 22a and the second The second slide shaft 22b rotates easily, and sets the distance between the electrode holders 44a and 44b integrally connected to the first slide shaft 22a and the second slide shaft 22b to a desired distance.

As described above, in the present embodiment, the first slide shaft 22a and the second slide shaft 22a are not required to be carried out while the bolt is loosened and the electrode holder is rotated while the slide shaft is fixed. By rotating 22b, the distance between the first electrode 30a and the second electrode 30b can be set to be freely displaceable.

Next, another embodiment according to the present invention will be described. In this case, the same components are denoted by the same reference numerals, and detailed description thereof will be omitted.

A welding head 60 with a balance mechanism shown in FIG.
Is basically composed of a body part 62, an equalizer part 28, and an electrode part 32.

The body portion 62 has a rectangular parallelepiped shape, and a hole (not shown) is defined on both sides along the vertical direction, and the first slide shaft 22a and the second slide shaft 2 are formed in the hole.
2b are slidably fitted respectively. A plurality (two in the figure) is provided between the first slide shaft 22a and the second slide shaft 22b projecting upward from the body portion 62.
Of the supporting members 66a and 66b are bridged,
Slots 68a, 68b are formed at the distal ends of 6a, 66b, respectively, and are attached to the first slide shaft 22a and the second slide shaft 22b via bolts (not shown). Further, semicircular notches 70a, 70b in which the first slide shaft 22a and the second slide shaft 22b are fitted are formed in the support members 66a, 66b,
The first slide shaft 22 is provided in the notches 70a and 70b.
a, the second slide shaft 22b is fitted to achieve a vertical guide function.

A support 72 for holding the equalizer 38 from above is provided. The support 72 includes a holding member 74 having a bifurcated distal end, and an equalizer 3.
Actuator 76 for displacing the head 8 in the vertical direction
including. The holding member 74 is attached to the center of the equalizer 38 via a bolt, and a rod 78 connected to the actuator 76 is fixed to the upper end of the holding member 74. The electrodes 46a and 46b are pressed against the metal to be welded via the equalizer 38 under the driving action of the actuator 76.

In the drawing, reference numeral 80 denotes a cover for shielding the equalizer 28 and the body 62 from the outside.

In this embodiment, the electrode holders 44a, 44b are supported by the support members 66a, 66b bridged by the first slide shaft 22a and the second slide shaft 22b.
b is prevented from rotating during welding of the metal plate, it is possible to always weld at a fixed location, and by rotating the first slide shaft 22a and the second slide shaft 22b, the first electrode 30a, second electrode 30b
Can be easily changed.

[0025]

According to the welding head with the balance mechanism according to the present invention, the following effects can be obtained.

A first roller and a second roller for sharply balancing the pressing force of the electrodes when welding two metals are attached to the equalizer side, and the first roller and the second roller are connected via an electrode holder. The first slide shaft and the second slide shaft are rotatable with respect to the first roller and the second roller by contacting the first slide shaft and the second slide shaft to which the electrodes are connected. The distance between the second electrodes is set to the first slide shaft,
It can be easily set by rotating the second slide shaft or the electrode holder holding these.

[Brief description of the drawings]

FIG. 1 is a perspective view of a welding head with a balance mechanism according to the present invention.

FIG. 2 is a second view of the welding head with a balance mechanism according to the present invention;
It is a perspective view of an Example.

FIG. 3 is a perspective view of a welding head with a balance mechanism according to the related art.

[Explanation of symbols]

 Reference Signs List 20 welding head with balance mechanism 22a first slide shaft 22b second slide shaft 24 body part 26a first roller 26b second roller 28 equalizer part 30a first electrode 30b second electrode 32 electrode Part 38: Equalizers 40a, 40b: Flat parts 44a, 44b: Electrode holder 60: Welding head with balance mechanism 66a, 66b: Support member

Claims (1)

(57) [Scope of request for utility model registration] 1. A first slide shaft and a second slide shaft each having one end connected to a first electrode and a second electrode, respectively, and the first slide shaft and the second slide shaft are fitted. A body portion to be held; and an equalizer portion fixed to the body so as to be swingable and having a first roller and a second roller attached to both ends thereof, wherein the first roller of the equalizer portion includes the first roller and the second roller. A welding head with a balance mechanism, wherein the other end of the first slide shaft abuts, while the other end of the second slide shaft abuts on a second roller.