JPS5937344Y2 - articulated spot welder - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an articulated spot welding machine in which an arm on which a spotting gun is installed has an articulated structure, and the spotting gun can be moved to any position on a workpiece on a jig.

Conventionally commonly used spot welding machines are broadly classified into stationary spot welding machines and multi-spot welding machines.

In a stationary spot welding machine, a spot gun and a gun receiver are fixedly connected to the anode and cathode sides of a welding power source, facing each other, and a workpiece is inserted between the spot gun and the gun receiver. The structure is such that it can be used for spotting.

Therefore, when a workpiece has a large number of spot welding locations, the workpiece itself must be moved manually or by other methods to position it at a fixed spot gun position.

When the shape of the workpiece is large, not only does positioning the workpiece require a lot of effort, but it may also be difficult to accurately position the workpiece at a predetermined spot position.

In addition, since movement and positioning of the workpiece is mainly done manually, the spotting gun is often operated using a foot-operated switch. Therefore, depending on the shape of the workpiece, the operation of this foot-operated switch may not be performed smoothly. It has its drawbacks.

On the other hand, multi-spot welding machines are mainly used for mass-produced workpieces that have a large number of spot welding locations.

Its structure is that a workpiece is placed on a jig, and a number of spotting guns are placed facing each other at positions corresponding to the number of spots on the workpiece, and spotting is performed at once using an operation switch. be.

Although the work efficiency is good and the quality of the spot welding itself is stable, it has the disadvantage that the workpieces are limited.

That is, although the spot guns of a multi-spot welding machine can be adjusted to some extent, the positioning work requires a considerable amount of time.

Therefore, multi-spot welding machines are generally used for mass production, with a fixed workpiece and spot guns positioned at positions corresponding to unique spot locations on the workpiece.

Therefore, it is not suitable as a spot welding machine for producing a wide variety of products in small quantities.

Since the casing is naturally expensive, it is generally difficult to adapt this spot welding machine to each type of workpiece.

As mentioned above, both stationary spot welding machines and multi-spot welding machines are produced in small quantities with a wide variety of products, have relatively large workpiece shapes, are unsuitable for work with a large number of spots, and have poor work efficiency. , which was considered a problem in terms of productivity improvement and economic efficiency.

Therefore, there has been a strong demand for a spot welding machine that can overcome these drawbacks.

This invention was proposed based on these requests.
The purpose is to be able to smoothly and easily move the spot gun to any position on the workpiece installed on the jig, to improve work efficiency by spot welding multiple locations, and to change the jig. Therefore, it is an object of the present invention to provide an inexpensive articulated spot welding machine that can suitably handle various types of workpieces, thereby increasing economical effects.

In order to achieve the above object, the present invention pivots a first arm to a post fixed to a bed, articulates a second arm to this first arm, and The articulated spot welding machine is characterized by having a spot gun installed in the welding machine, an operating handle for operating each arm, and an operating switch for operating the spot gun.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows the external configuration of an articulated spot welding machine.

A support post 2 is disposed upright on a sub-bella Ha fixed to a bed 1.

A first arm 3 is pivotally attached to the column 2, as will be explained later.

Two coupling plates 5, 5a are connected to the other end of the first arm 3.

The coupling plates 5 and 5a are also connected to the other end of the second arm 4.

The coupling plates 5, 5a and the first and second arms 3, 4 are connected by a joint pin 6, as will be explained later.

A spotting gun 7 is installed at the tip of the second arm 4.

The spotting gun 7 has a gun cylinder 8 and a tip 7.
It is composed of a, etc.

Operating handles 9, 9a and operating switches 10, 10a are installed at the tip and side of the second arm 4, respectively.

The operating handles 9, 9a are used to move the first and second arms 3, 4 to appropriate positions.

The operating switch 10.10a in the housing operates the spotting gun, and is arranged near the mounting position of the operating handles 9, 9a in order to operate it in synchronization with the movement of the operating handles 9, 9a. ing.

A transformer 11 is fixed to the sub-bell Ha.

One of the cables 12 connected to the transformer 11 is connected to the spotting gun 7, and is held by the first and second arms 3, 4 through an insulator 12a.

A jig plate 13 is attached to the top surface of the bed 1.
Jig pieces 14, 14a for positioning the workpiece 15.15a in a fixed position are arranged.

The workpiece 15 is placed on back electrodes 16, 16a, and the transformer 1 is placed on the back electrodes 16, 16a.
Another one of the cables 12 from 1 is connected.

In the figure, the spot positions of the workpiece 15.15a are indicated by A, B, C, and D.

The transformer 11 is connected to a spot welding machine control device 17 to control the amount of electric power and the like.

2 and 3 show the structure of the coupling means around the coupling plate 5 in FIG. 1.

A joint pin 6 is inserted into the ends of the first and second arms 3, 4 and penetrates in the vertical width direction thereof.

This articulation pin 6 is pivotally connected to a sleeve A23 inserted into the other ends of the first and second arms 3 and 4.

That is, the first and second arms 3, 4 can smoothly and lightly rotate around the joint pin 6 by the needle bearing 26 and the thrust roller bearing 27 installed inside the sleeve A23. There is.

The sleeve A23 has a structure in which it is screwed onto a reinforcing plate 24 fixed to the first and second arms 3 and 4 with bolts 25.

The coupling plates 5 and 5a are inserted above and below the joint pin 6, and are attached by nuts 22 so as to abut on the thrust roller bearing 27 via a spacer 28.

With the above configuration, the coupling plate 5.5a is connected to the first arm 3.
The second arm can be rotated smoothly around the
It becomes possible to rotate smoothly around the coupling plates 5, 5a.

In FIG. 3, both ends of the coupling plate 5a are formed in an arc shape as shown at E and F over a quarter of the circumference.

Further, stoppers 20 are arranged at both ends of the coupling plate 5a with a slight gap between them, and the stoppers 20 are screwed onto the reinforcing plate 24 by bolts 29.

Therefore, the coupling plate 5a is restricted so that it cannot rotate more than 900 degrees in the direction of the arrow from the illustrated position with respect to the first arm 3.

Similarly, the second arm 4 is restricted so that it cannot rotate more than 90 degrees in the direction of the arrow from the illustrated position with respect to the coupling plate 5a.

FIG. 4 shows a connection structure between the first arm 3 and the support column 2.

A base 30 is fixed to the subbed 1a.

A pillar 36 is fixed to the base 30 in an upright manner.

A sleeve 838 and a sleeve C32 are fixed to the top and bottom of the first arm 3 by bolts 33 and 34, respectively.

Needle bearings 37 and 35 are inserted into the sleeve 838 and sleeve C32, respectively, and the needle bearings 37 and 35 allow the first arm 3 to
is pivoted to pillar 3.

Further, the upper side of the pillar 36 has a thrust roller bearing 3
9 and is attached to the sleeve 838 by a nut 40.

Furthermore, the sleeve C32 is placed on the base 30 via the thrust row 2 bearing 31.

The preload adjustment of the thrust roller bearing 31 is performed by a nut 40 similarly to the thrust roller bearing 39 described above.

A cover 41 is attached to the upper side of the sleeve 838 to prevent dust from entering the bearings.

The operation of the articulated spot welding machine having the configuration described above will now be described.

As explained in FIG. 1, the workpiece 15 is fixed in position.

Grip the operating handles 9, 9a and select spot points A, B, C,
The spotting gas 70 chip 7a is positioned at position D.

Spotting is then performed by entering the operating switch 10.10a.

In FIG. 5, the first arm 3, the coupling plate 5.5a.

The operation of the second arm 4 will be explained.

A first arm 3, a connecting plate 5.degree. 5a, and a second arm 4 are positioned around the support center I as shown by solid lines.

In this case, the center of the joint pin of the first arm 3 is represented by ■, the center of the joint pin of the second arm 4 is represented by ■, and the center position of the spotting gun is represented by ■.

Now, when the first 7-arm 3 is set to 11 and the coupling plates 5, 5a and the second arm 4 are rotated 90', the joint pin center of the second arm 4 becomes IIIa, and the spot gun The center is IVa.

Next, by appropriately rotating the first arm 3 around the support column and also appropriately rotating the coupling plates 5, 5a and the second arm 4, the joint pin centers of the first arm 3 are set to nb, n.
c, and the center position of the joint pin of the second arm 4 and the center position of the spotting gun are respectively (b).

I[c and changes as IV b , IV c.

As described above, the above-mentioned spot points A, B, and C are obtained.

Spot D can be easily performed.

As described above, the connecting plate 5.5a rotates 900 times with respect to the first arm 3, and the second arm 4 also rotates 900 times with respect to the connecting plates 5, 5a. 2
The arm 4 of is rotatable at position 1 of 180°.

Since the first arm 3 can rotate around the support column 2, the center of the spotting gun can be moved to an arbitrary position on the jig 13.

Therefore, even if the workpiece is changed, spotting can be performed in the 11th state.

Moreover, since the workpiece is fixed in a fixed position, it is easy to handle, and the joint pin 6 and support column 2 are easy to handle.
Because of the bearing support structure described above, operation is smooth, improving work efficiency and guaranteeing stable quality.

Furthermore, unlike a multi-spot welding machine, it uses a single spot gun, so it can be manufactured at low cost.

In addition, in the above embodiment, there were two joint pin structures, but
It is not limited to this.

Further, although the structure is such that a single first arm is supported on the support column, the present invention is not limited to this.

As is clear from the above description, according to the present invention, the spotting gun can be moved smoothly and easily to any position on the workpiece on the jig, and spotting can be carried out efficiently in a large number of places. The present invention can easily be applied to various types of workpieces, and can be manufactured at low cost.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the overall structure of an embodiment of the present invention;
The figure is a cross-sectional view showing the detailed structure around the joint pin, Figure 3 is a bottom view showing the stopper structure of the connecting plate in Figure 2, and Figure 4 is a cross-sectional view showing the detailed structure around the connecting part of the column and arm. , FIG. 5 is an explanatory view showing the movement state of the spotting gun position via the arm and the coupling plate.

Claims (1)

[Claims for Utility Model Registration] 1. In a spot welding machine for spot welding workpieces attached to a jig on a bed, a first arm having one end pivoted to a support fixed to the bed; a second arm arranged in a direction extending from the other end of the first arm and having a spotting gun installed near its tip; and a second arm pivoted to the other end of the first arm. a coupling means installed on the second arm and coupled to the first arm;
An articulated spot comprising: an operating handle for operating the arm and the second arm around the support; and an operating switch installed near the operating handle for operating the spotting gun. Welding machine. 2. The coupling means includes a coupling plate disposed astride the other end of the first arm and the other end of the second arm opposing the first arm, and the first arm and the second arm attached to the coupling plate. and a joint pin structure that is pivotally connected to each other, and has a structure that allows the coupling plate to rotate with respect to the first arm and allows the second arm to rotate with respect to the coupling plate. An articulated spot welding machine according to claim 1 of the utility model registration claim, characterized in that: 3. The coupling means includes a stopper structure that limits the rotation angle of the coupling plate with respect to the first arm and the rotation angle of the second arm with respect to the coupling plate within 90 degrees, respectively, on the first arm. The articulated spot welding machine according to claim 2, characterized in that the second arm and the coupling plate are provided with the second arm and the coupling plate.