JPH02278705A - Transformer device with rectifier - Google Patents

Abstract

PURPOSE:To efficiently perform a current supplying work and reduction in size of a whole device by integrally connecting a sole terminal strip to the secondary coils of respective transformers through rectifiers, and integrally connecting a sole center-tap terminal strip to the intermediate parts of the secondary coils to connect a welding gun to the strip and the center-tap strip. CONSTITUTION:A terminal strip 36 to be integrally connected to the secondary coils of respective transformers 14a-14d through rectifiers and a center-tap terminal strip 26 to be integrally connected to the intermediate parts of the secondary coils are provided in a transformer device 10 in which at least two or more of the rectifiers 14a-14d with rectifiers are provided in parallel. A mount 30 for coupling a welding gun 60, etc., directly to the strips 36 and 26 is formed. Thus, when a plurality of transformers with rectifiers are provided in parallel, the transformers can be disposed in the vicinity, the size of the whole device can be reduced and power loss can be decreased.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a transformer device with a rectifier, in particular:
A single terminal plate is integrally connected to the secondary coil of each transformer via a rectifier, and a single center tap terminal plate is integrally connected to the middle part of each secondary coil to connect multiple The present invention relates to a transformer device with a rectifier configured to have transformers installed in parallel.

[Background of the Invention] Conventionally, a transformer device has been known in which a terminal plate is connected to both ends of a secondary coil of a transformer via a rectifier, and a center tap terminal plate is led out from an intermediate portion of the secondary coil. For example, it is often used by being incorporated into resistance welding equipment. At that time, in an inverter-type resistance welding device, a switching element provided on the negative side, for example,
There is a limit to the current output to the welding gun due to the capacity of the power transistor or the capacity of the rectifier on the secondary side. For this reason, for example, when welding thick plates or plated steel plates,
Since a relatively large current is required, it is desirable to increase the capacity by connecting multiple transformers.

However, in practice, the terminal plates and center tap terminal plates are provided on different sides of the transformer, and the terminal plates and center tap terminal plates of each transformer are connected to each other in the first direction.
and a second conductor, while the other ends of the first and second conductors must extend close to each other and be connected to a welding gun. As a result, it has been pointed out that there are disadvantages in that the entire transformer device becomes larger and heavier, and the first and second conductors become considerably elongated, causing significant power loss.

[Object of the Invention] The present invention has been made to overcome the above-mentioned disadvantages, and consists of integrally connecting a single terminal plate to the secondary coil of each transformer via a rectifier, while A single center-tapped terminal plate is integrally connected to the intermediate portion of the secondary coil, and a welding gun is connected to the terminal plate and the center-tapped terminal plate, thereby reducing the number of parts and It is an object of the present invention to provide a transformer device with a rectifier, which can prevent current loss as much as possible to perform an efficient current supply operation, and can achieve miniaturization of the entire device.

[Means for achieving the object] In order to achieve the above object, the present invention provides a transformer device in which at least two or more transformers with rectifiers are arranged in parallel, and a rectifier is interposed in the secondary coil of each transformer. A welding gun or the like is directly connected to the terminal plate and the center tap terminal plate. It is characterized in that it is configured to form a mounting part for connection.

[Embodiments] Next, preferred embodiments of the transformer device with a rectifier according to the present invention will be described in detail with reference to the accompanying drawings.

In FIGS. 1 to 3, reference numeral 10 indicates a transformer device with a rectifier according to this embodiment.

The transformer device 10 has a casing 12 made of aluminum metal or the like, and substantially four transformers 14a to 14d are housed within the casing 12.

The transformer 14a includes a pair of cores 16a, 16a which have a substantially rectangular cylindrical shape and are arranged above and below, and the cores 16a, 1
A pair of secondary coils 20a, 20a are wound and housed in the coil 6a so as to be sandwiched between the secondary coils 18a, 18a, respectively. The secondary coil 18a is connected to an AC power source (not shown), while both ends 22a of the secondary coil 20a
1, that is, the secondary electrode plate 24a is integrally attached to the winding start end and the winding end end. Note that an insulating material 25a is provided between the respective secondary electrode plates 24a and 24d.

Although the transformer 14a has been described in detail above, the other transformers 14b to 14d are constructed in the same way as this transformer 14a, and the same components are designated by the same reference numerals to d. The detailed explanation thereof will be omitted. In this case, transformers 14a and 14b and transformer 14
C and 14d are configured to have symmetrical shapes.

Therefore, a center tap terminal plate 26 is integrally fixed to each transformer 14a to 14d. The center tap terminal plate 26 is formed of a plate-shaped conductive material, and has connecting portions 28a to 28d extending outward from the center thereof. The connection portion 28a has a bent shape and is fixed to an intermediate portion of the secondary coils 20a, 20a, which substantially constitute the transformer 14a. In addition, other connection parts 28b to 28
d similarly has a bent shape, and the secondary coils 20b, 20b
.

20C, 20C, 20d, and the intermediate portion of 20d are engaged. Attachment portions 30 are provided in the center of the center tap terminal plate 26 at positions equidistantly spaced from the respective connection portions 28a to 28d. The mounting portion 30 actually extends upward from the center tap terminal 26 and then bends upward in FIG. 3, and has screw holes 32a, 32b at its ends.
form.

On the other hand, secondary electrode plates 24a, 24d% 24b, 24b.

24C124C and 24d, 24d each rectifier 34
a, 34a, 34b, 34b, 34c, 34c and 3
4d134d, and the terminal plate 36 is integrally arranged thereon. The terminal plate 36 is formed of a plate-shaped conductive material, and has rectangular connection parts 38a to 38d extending outward from the center thereof. In this case, a mounting 840 is substantially formed in the center of the terminal plate 36, and screw holes 42a and 42b are formed in this mounting portion 40, and between the connection parts 38a and 38b and 380 and 38d. A slit 44a144b is formed in the area.

Here, the rectifier 34a is connected to the connection part 38a of the terminal board 36,
A disc spring (not shown) is interposed corresponding to the plate 34a, and a plate 46a is provided, and the plate 46a and the secondary electrode plates 24a, 24a are fixed with a plurality of bolts 48a. Similarly, the other connection parts 38b to 38d are
Secondary electrode plate 24b via plates 46b to 46d,
24b, 24c, 24c and 24d, 24d are fixed with bolts 48b to 48d. At this time, since the terminal plate 36 is formed with the sleeves 44a and 44b, the terminal plate 36 itself becomes flexible, and each connection portion 3
111a to 38d are secondary electrode plates 24a, 24a to 2
4d and 24d can be securely fixed.

Next, the welding gun 60 is attached to the transformer device 10. The welding gun 60 includes a bracket 62 fixed to the casing 12, and a fixed gun arm 64 is provided on the bracket 62, and a movable gun arm 66 is swingably supported via an opening/closing means (not shown) such as a cylinder. Ru. The fixed gun arm 64 and the movable gun arm 66
Electrodes 68a and 68b are respectively attached to face each other.

Then, the fixed gun arm 64 and the center tap terminal plate 26
Both ends of the multilayer strip copper plate 70a are connected to the mounting portion 30 of the movable gun arm 66 via bolts (not shown).
Similarly, a multilayer strip-shaped copper plate 70 is attached to the mounting portion 40 of the terminal board 36.
Both ends of b are connected.

In this way, the welding gun 60 is attached to the transformer device 10, and the transformer device IO is also attached to the arm 72 of a robot device (not shown).

A block diagram of the electrical circuits of the transformer device 10 and the welding gun 60 is shown in FIG.

The rectifier-equipped transformer device according to this embodiment is basically constructed as described above, and its operation and effects will be explained next.

First, the parts of the two workpieces W and W2 to be welded are overlapped, and the transformer device 10 and the welding gun 60 are integrally welded together via the arm 72 under the driving action of a robot device (not shown). It is transported to a predetermined part of W2 to be welded. Next, the movable gun arm 66 is oscillated under the driving action of an opening/closing means (not shown), and the electrode 68 attached to the movable gun arm 66 and the fixed gun arm 64 is
The workpieces 'VVI and W2 are held between the workpieces 68a and 68a.

Therefore, as shown in FIG. 4, when an AC power source (not shown) is driven to output a high frequency AC current, this high frequency AC current is transferred from the primary coils 18a to 18d of the transformers 14a to 14d to the secondary coils 20a to 20d. The signal is transmitted and rectified into a single-phase full-wave by rectifiers 34a to 34d connected to both ends of the secondary coils 20a to 20d. Therefore, the rectified electric currents, through (1), are connected to the terminal board 3
6 from the connection parts 38a to 38d to the attachment part 40 and are added. For this reason, the fixed gun arm 64 is attached to the mounting portion 40.
The electrode 68a is electrically connected to the center tap terminal plate 26 via the movable gun arm 66.

A welding current 1o is supplied between the electrode 68b and the electrode 68b which is connected to the welding current 1o. At this time, since the mounting portion 40 is provided in the center of the terminal plate 36, the currents 11 to 4 rectified by the rectifiers 34a to 34d are accurately added to obtain the desired welding current I. will be obtained. As a result, the parts to be welded of the works W, , W2 are melted, and the work W2 is melted.
1. The desired portion of W2 is joined.

In this case, according to the present embodiment, the number of parts for substantially arranging the four transformers 14a to 14d in parallel in the casing 12 is reduced at once, thereby achieving miniaturization of the entire transformer device 10, and Power loss can be reduced as much as possible.

That is, in the intermediate portions of the secondary coils 20a, 20a to 20d, and 20d constituting the respective transformers 14a to 14d, there are connection portions 28a constituting the center tap terminal plate 26.
28d to 28d are integrally fixed, and a fixed gun arm 64 is directly connected to the mounting portion 30 of the center tap terminal plate 26 via a multilayer strip-shaped copper plate 70a. On the other hand, each connection portion 38a to 38d of the terminal plate 36 is engaged with both ends of each secondary coil 20a, 20a to 20d, 20d via a rectifier 34a134a to 34d, 34d. multilayer strip copper, plate 70b
A movable gun arm 66 is directly connected thereto.

Therefore, there is no need to provide a conductor between the terminal plate or the center tap terminal plate and the welding gun as in the conventional case, and the number of parts can be reduced.

In particular, in the case of the embodiment in which four transformers 14a to 14d are arranged in parallel, there has conventionally been a problem that the conductor becomes considerably long, but in the transformer device 10, Such a long conductor becomes unnecessary. As a result, the entire transformer device 10 can be easily downsized, power loss can be reduced all at once, and the welding gun 60 can carry out efficient welding work.

Furthermore, in the center tap terminal plate 26, the mounting portion 3
0 is led out from the center of the center-tap terminal plate 26, which provides the advantage that current flows uniformly from the electrode 68b through the mounting portion 30 to the respective connection portions 28a to 28d.

[Effects of the Invention] As described above, according to the present invention, when a plurality of transformers with rectifiers are installed in parallel, the transformers can be arranged as close as possible to each other, and the overall size of the transformer device is reduced. The effect is that miniaturization is easily achieved. Furthermore, it becomes possible to reduce the number of parts at once, and the advantages of reducing the weight of the transformer device and considerably reducing power loss become apparent.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments.
Of course, various improvements and changes in design are possible without departing from the gist of the present invention.

[Brief explanation of drawings]

Fig. 1 is a perspective explanatory view of a rectifier-equipped transformer device according to the present invention with a welding gun attached, Fig. 2 is a partially sectional front view of the transformer device, and Fig. 3 is an exploded view of the main parts of the transformer device. A perspective explanatory view, FIG. 4 is a block diagram of the electric circuit of the transformer device. 38a-38d...Connection part 60...Welding gun 40...Mounting part (1 other person) 10...Transformer device 12...Casing 142-14d...Transformer 24a-24d... Secondary electrode plate 26...Center tap terminal plate 28a-28d...Connection parts 34a-34d...Rectifier 30...Mounting part 36...Terminal board Jtld FI 0.2 FIo, 4

Claims (3)

[Claims] (1) A transformer device in which at least two or more transformers with rectifiers are installed in parallel, with a terminal plate integrally connected to the secondary coil of each transformer with a rectifier interposed therebetween, and a terminal plate intermediate between each secondary coil. A rectifier comprising a center tap terminal plate integrally connected to the center tap terminal plate, and configured to form a mounting portion for directly connecting a welding gun or the like to the terminal plate and the center tap terminal plate. With transformer device. (2) The transformer device with a rectifier in the device according to claim 1, wherein the terminal board and the center tap terminal board are each provided with a mounting part at a position equidistantly spaced from a connection part with each secondary coil. . (3) A transformer device with a rectifier according to claim 1 or 2, wherein at least a slit is formed in the terminal plate, and the terminal plate itself is configured to be flexible.