JP2519988Y2 - Transformer with rectifier in resistance welding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a transformer with a rectifier in a resistance welding machine,
More specifically, a rectifier is arranged between a pair of mounting plates provided at the winding start and winding end ends of the secondary coil of the transformer for a resistance welding machine and the terminal plate, and one mounting plate is provided. On the other hand, the present invention relates to a transformer with a rectifier in which the other mounting plate is configured to be displaceable and the rectifier can be tightened uniformly.

“Prior Art” Conventionally, for example, a welding robot by resistance welding has been frequently used in an automobile production line. In this case, the reason for resistance welding is that it is necessary to supply a large current to the object to be welded. As a welding machine for this welding robot, an inverter that once converts direct current into high-frequency alternating current, supplies this high-frequency alternating current to a welding transformer to reduce the voltage, then re-converts it into direct current using a rectifier and supplies it to the welding gun arm. A direct current resistance welding device is used.

The reason for converting to high-frequency alternating current is to make the welding transformer relatively lightweight by utilizing the fact that the cross-sectional area of the transformer core forming the welding transformer is in inverse proportion to the frequency of the high-frequency alternating current. As a welding transformer of this type, for example, the present applicant has already proposed the “transformer with a rectifier” devised in Japanese Utility Model Publication No. 61-33621. This transformer is composed of a primary coil wound many turns, a transformer core, and a one-turn secondary coil. Especially, at the winding start end and the winding end end of the secondary coil, the main part of the terminal board is A rectifier semiconductor layer is deposited on the surface, and then two rectifying elements formed by laminating electrode conductors are tightened with bolts, respectively, and a center tap terminal plate is led out from an intermediate portion of the secondary coil. Is configured.

[Problems to be Solved by the Invention] However, in this type of transformer with a rectifier, mounting plates are fixed to the winding start end and the winding end of the secondary coil, respectively, and the space between these mounting plates and the terminal plate is fixed. If a pair of rectifiers interposed between and is to be tightened, it becomes difficult for the secondary coil having high rigidity to tighten the mounting plates so that they are parallel to each other. If the rectifier is not tightened uniformly in this way, there will be a difference in contact resistance, and in some cases the diode that constitutes the rectifier will be destroyed. That is, in the prior art, there is a disadvantage that it takes a great deal of time and effort to uniformly tighten this type of rectifier.

The present invention has been made to overcome the above-mentioned inconvenience, and one of the rectifier mounting plates extending from the winding start end or the winding end end of the secondary coil of the transformer is fixed. And the other is a movable mounting plate, and when one set of rectifiers is to be sandwiched via the two mounting plates, the other mounting plate is substantially fixed to the other mounting plate via the tightening member. It is intended to provide a transformer with a rectifier, which allows the rectifiers to be parallel to each other, thereby uniformly tightening the rectifier, and then electrically connecting the other mounting plate and the end of the secondary coil through the connecting plate. And

[Means for Solving the Problems] In order to solve the above problems, a transformer with a rectifier in a resistance welding machine according to the present invention is a winding start end and a winding end of a secondary coil of a resistance welding machine transformer. It has a set of mounting plates installed at each end, and a set of rectifiers is installed between the set of mounting plates and the terminal plate, and for the center tap from the middle part of the secondary coil. In a transformer with a rectifier that derives a terminal plate, the one mounting plate is fixed to one end of the secondary coil, the connection plate is fixed to the other end, and the other mounting plate is the one By sandwiching a set of rectifiers through the terminal plate by displacing to the mounting plate side, inserting a plurality of bolts into the one mounting plate, the other mounting plate and the terminal plate, and then the one mounting plate. And the other mounting plate in parallel with each other by tightening with the bolts. And, the connection plate is brought into contact with the side wall of the other of the mounting plate, characterized in that an electrical connection of the other mounting plate and secondary coil through the connection plate.

Further, according to the present invention, in such a transformer with a rectifier, the connection plate has an elongated hole extending in a direction in which the other mounting plate is displaced to the one mounting plate side, and the bolt is inserted through the elongated hole. Is tightened by screwing into the side wall of the other mounting plate to electrically connect the other mounting plate and the other end of the secondary coil by the connection plate.

[Operation] According to the present invention, one mounting plate is fixed to one end of the secondary coil, and the other mounting plate can be displaced with respect to the one mounting plate. Therefore, after sandwiching the first rectifier and the second rectifier evenly with the terminal plate sandwiched between the two mounting plates, the end portion of the secondary coil and the other mounting plate are connected via the connecting plate. First because it is electrically connected
The contact resistance between the rectifier and the second rectifier can be fixed without any difference.

[Embodiment] A preferred embodiment of the transformer with a rectifier in the resistance welding machine according to the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a transformer according to the present invention, and the transformer 10 has a primary coil 12 and a secondary coil 20. A pair of cores 14 and 16 are arranged by utilizing the central space of the primary coil 12. The secondary coil 20 is provided opposite to the primary coil 12. The secondary coil 20 will be described in detail below.

First, the hexagonal first tightening plate 22 (see FIG. 2) is arranged outside the movable mounting plate 24 having the same shape. Bolt holes 25a, 25b (see FIG. 3) are formed on the side wall of the movable mounting plate 24 so as to be oriented toward the center thereof, and the secondary coil 20 is adjacent to one side surface thereof.
The secondary coil 20 is configured separately from the movable mounting plate 24. The secondary coil 20 extends in the horizontal direction from the movable mounting plate 24 side, and after passing through the space of the core 14, bends once and is directed downward, and further bends to the movable mounting plate 24 side. It extends like going back. Then, after the end portion is bent and extends parallel to the thickness direction of the movable mounting plate 24,
It again rises upward, and extends parallel to and away from the movable mounting plate 24. Then, after descending again, it is integrated with the fixed mounting plate 26. The center tap 28 is raised in the middle of the secondary coil 20.

A disc spring 30 is arranged outside the fixed mounting plate 26, and a second tightening plate 32 is further provided outside the disc spring 30. A cover member 34, preferably made of bakelite, is arranged outside the tightening plate 32.

Here, the hexagonal terminal plate 40 is disposed between the movable mounting plate 24 and the fixed mounting plate 26, and the end portion of the terminal plate 40 is extended outward. A first diode 42 and a second diode 44 are provided between the terminal plate 40 and the movable mounting plate 24 and between the terminal plate 40 and the fixed mounting plate 26, respectively. In this case, the connection plate 50 is obliquely fixed to the end of the secondary coil 20 on the side of the movable mounting plate 24 by brazing or the like. Therefore, the end of the secondary coil 20 is cut so as to be substantially inclined. As will be described later, the connecting plate 50 has a pair of elongated holes 52 along the displacement direction of the movable mounting plate 24.
a and 52b are provided. As shown in the drawing, the movable mounting plate 24, the fixed mounting plate 26, the terminal plate 40, etc. are each provided with six through holes 60 for inserting bolts. In this case, the first diode 42, the second diode 44, the disc spring 30
Is preferably surrounded by elastic members 62, 64 and 66, for example. This is to prevent intrusion of spatter during welding.

The transformer with rectifier in the resistance welding machine according to the present invention is basically constructed as described above. Next, its function and effect will be explained.

First, as shown in the figure, the terminal plate 40 and the first diode 4
2. After arranging the second diode 44 in a stacked state, the movable mounting plate 24 and the fixed mounting plate 26 are further stacked. Then, the first tightening plate 22 is attached to the movable mounting plate 24, and
A second tightening plate 32 is stacked on the fixed mounting plate 26, and a disc spring 30 and a cover member 34 are further stacked on the tightening plate 32.

In such a state, the second tightening plate 32, the fixed mounting plate 26, the terminal plate 40, the movable mounting plate 24, and the first tightening plate 22 each having the through hole 60 formed from the cover member 34 side are attached to the first tightening plate 22. Insert a set of bolts 70 and tighten them evenly with a nut (not shown). When tightening,
Since the movable mounting plate 24 is not a structure that is fixed to the highly rigid secondary coil as described in the section of the prior art, but is a single independent plate, it can freely come close to the fixed mounting plate 26 side. Alternatively, since the movable mounting plate 24 can be moved so as to be separated from each other, the position of the movable mounting plate 24 can be adjusted so as to be substantially parallel to the fixed mounting plate 26.

As described above, after the movable mounting plate 24, the first diode 42, the second diode 44, the fixed mounting plate 26, etc. are tightened, the bolt 80 is inserted into the long holes 52a, 52b of the connection plate 50, and the bolt 80 The connection plate 50 is brought into pressure contact with the movable mounting plate 24 by facing the holes 25a and 25b of the movable mounting plate 24 and screwing. As a result, electrical contact between the secondary coil 20 and the movable mounting plate 24 is achieved.

According to the present embodiment, the movable coil plate 24 side of the secondary coil 20 is obliquely cut out as described above, and the connecting plate 50 that comes into contact with the inclined surface of the movable coil plate 24 is provided at the tip thereof. Then, the movable mounting plate 24 is once displaced so that the fixed mounting plate 26, the second
After tightening the tightening plates 32 and the like so as to be substantially parallel, the movable mounting plate 24 and the connecting plate 50 are tightened with the bolts 80 screwed into the connecting plate 50. Therefore, this movable mounting plate
By adjusting the position of 24, the first diode 42 and the second diode 44 sandwiched between the terminal plate 40, the movable mounting plate 24, and the fixed mounting plate 26 can be evenly tightened. As a result, the diode 42, The contact resistances of 44 are substantially equal.

[Effect of the Invention] According to the present invention, as described above, a set of rectifiers is sandwiched between a fixed mounting plate and a movable mounting plate via a terminal plate, and the movable mounting plate is displaced to the secondary coil side. Even if it is fixed after that, there is provided a connection plate adapted to be electrically connected to the secondary coil. As a result, when finally trying to tighten the rectifier with the tightening plate through the terminal plate, the movable mounting plate, and the fixed mounting plate, the contact resistance of each of the two rectifiers is adjusted by adjusting the position of the movable mounting plate. It is possible to make them substantially the same. As a result,
There is a practical effect that the rectifying action is carried out evenly, and furthermore, it is possible to avoid a damage accident of the rectifier which is caused by the difference in the contact resistance.

[Brief description of drawings]

1 is a perspective view of a transformer with a rectifier in a resistance welding machine according to the present invention, FIG. 2 is a plan view of the transformer of FIG. 1, and FIG. 3 is a side view of the transformer shown in FIG. FIG. 10 …… Transformer with rectifier 12 …… Primary coil 20 …… Secondary coil 22 …… Tightening plate 24 …… Movable mounting plate 26 …… Fixed mounting plate 28 …… Center tap 32 …… Tightening plate 40 …… Terminal plate 42 …… First diode 44 …… Second diode 50 …… Connection plate

Claims (2)

(57) [Scope of utility model registration request] 1. A pair of mounting plates disposed at the winding start end and the winding end end of a secondary coil of a transformer for a resistance welding machine, wherein the pair of mounting plates and a terminal plate are provided. In a transformer with a rectifier, in which a set of rectifiers is arranged between the secondary coils and a center tap terminal plate is led out from the intermediate portion of the secondary coil, the one mounting plate is provided at one end of the secondary coil. Fix the connection plate to the other end, and displace the other mounting plate to the one mounting plate side to sandwich a set of rectifiers via the terminal plate, and the one mounting plate And inserting a plurality of bolts into the other mounting plate and the terminal plate,
The one mounting plate and the other mounting plate are tightened and fixed by the plurality of bolts so that they are parallel to each other, and the connection plate is brought into contact with the side wall of the other mounting plate to interpose the connection plate. A transformer with a rectifier in a resistance welding machine, characterized in that the other mounting plate is electrically connected to the secondary coil. 2. The transformer with rectifier according to claim 1,
The connecting plate has an elongated hole extending in a direction in which the other mounting plate is displaced toward the one mounting plate side, and a bolt is screwed into the side wall of the other mounting plate through the elongated hole to connect the bolts. A rectifier-equipped transformer in a resistance welding machine, wherein the other mounting plate and the other end of the secondary coil are electrically connected by a plate.