JPH0519288B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for tightening a tightening band for a cut core of a coil or transformer.

The conventional method of tightening the cut core tightening band is, for example, as shown in Fig. 1, by folding both ends at right angles and facing each other at a distance, and then drilling a screw hole in each of the upright pieces. Screw on the screws,
Alternatively, a screw is inserted into a hole drilled in the upright piece and a nut is tightened to tighten a tightening band wrapped around the outer circumference of the cut core. Also, conventionally, for example, the second
As shown in the figure, ring-shaped folded parts with notches are formed at both ends of the tightening band, round pieces are arranged in these folded parts, and bolts are screwed onto the round pieces to complete the tightening band. Wrap tightly around the outer circumference of the cut core.

Furthermore, conventionally, for example, as shown in Fig. 3, a frame with a rectangular cross section is used, and the bent part of the winding start end of the tightening band is locked to one end of the lower side of the frame placed on the outside of the cut core. Then, wrap the tightening band around the outer circumference of the cut core and insert it into the frame, then tighten the tightening band to tightly wrap it around the outer circumference of the cut core, crush the frame, and tighten the winding end of the tightening band. It is bent and locked onto the other end of the upper side of the frame, and then the frame portion is fixed by soldering.

However, in the conventional cut core tightening band tightening method, as shown in Fig. 1, the shape becomes large because the upright piece protrudes outward, and the use of screws makes the parts difficult to tighten. The drawback is that the number of points increases and the cost increases. Furthermore, the structure shown in FIG. 2 is complicated and the number of parts increases, resulting in high cost and impractical disadvantages. Furthermore, in the case of the one shown in Fig. 3, the number of assembly steps is increased, and the end fixing part of the tightening band is folded over and over again to the outside of the cut core, so a partial protrusion is formed on the outer periphery of the cut core. The disadvantage is that it does not look good on the outside.

Furthermore, in JP-A-55-72017, since the structure is such that one end of the band is simply inserted and sandwiched between the steel plates of the inpolyute core, the other end of the band must be held firmly. If the band is pulled, one end of the band is only in surface contact with the steel plate, so there is a risk that it may slip out between the cores.In order to spot weld both ends of the band, a complex structure is required to tighten the band. The drawback is that a tightening device is required, and the tightening work can only be carried out by a skilled person.

The present invention solves these conventional drawbacks, and it is possible to reduce costs by using a simple method and making assembly easier, and also to achieve a beautiful appearance by eliminating unnecessary protrusions. The object of the present invention is to provide a method for tightening a cut core tightening band.

Therefore, in a coil or transformer having a cut core, the present invention involves welding the winding start end of a tightening band to the outside of the cut core using an argon gas arc, tightly wrapping the tightening band around the outer periphery of the cut core, and then It is characterized in that the winding end portion that overlaps the winding start end portion is spot-welded to the winding start end portion.

Embodiments of the coil tightening method of the present invention will be described below based on the drawings.

In FIGS. 4 to 7, 1a and 1b are bobbins, and core insertion holes 2a and 2b are formed inside the bobbins 1a and 1b, and coil winding parts 3a and 3b are formed on the outside of the core insertion holes 2a and 2b. ing. 4a,
4b is a coil, which is wound in multiple layers around the coil winding parts 3a and 3b of the bobbins 1a and 1b and subjected to appropriate insulation treatment, and the end thereof is connected to the bottom of the bobbin 1b as a lead wire 5. Being pushed out. 6 is a cut core formed into a rectangle by laminating silicon steel plates and covering the outside with insulating resin, and the legs of two U-shaped core blocks 7a and 7b are connected to the bobbins 1a and 1b. Core insertion holes 2a, 2b
It is inserted through the two, butted together, and assembled as a unit. Spacers 8a and 8b are made of an insulating material and are inserted between the abutting ends of the core blocks 7a and 7b to form a gap and adjust the inductance value of the coil. Reference numeral 9 denotes a tightening band made of, for example, a long and thin strip of stainless steel.The winding start end 9a of the band is welded to the outside of the cut core 6 using arcon gas, and the tightening band 9 is wound once around the outer periphery of the cut core 6. and tightly wrap the tightening band 9 around the outer periphery of the cut core 6 to connect the two core blocks 7a and 7b together. The winding terminal end 9b is placed and superposed on the winding start end 9 welded with gas, and the winding end 9b is spot-welded to the winding start end 9a.

Next, a method of tightening the tightening band on the cut core of the coil of the above embodiment will be explained. When installing the cut core tightening band device, for example, a band as shown in FIGS. 8 and 9 is used. This is done using a tightening device. That is, the band tightening device 11 consists of a coil or transformer fixed holding means 12 and a band tightening means 13,
The fixed holding means 12 is attached to the base plate 1 in order to adjust the distance between the receiving plate 15 erected on the base plate 14 and the receiving plate 15.
4, an adjustment support plate 16 is movably fixed on the support plate 15 and is erected facing the receiving plate 15, and a rotation knob 1 is provided at the rear end of the adjustment support plate 16.
7, which is movably screwed into the adjustment support plate 16 and connected to the threaded rod 18, and the tip of the threaded rod 18 is connected to the threaded rod 18 in a non-rotatable manner, and a guide protrusion 19 is provided at the lower part of the threaded rod 18. and a pusher 21 which is slidably fitted into the guide groove 20 of the base plate 14 and moves forward and backward according to the rotation of the threaded rod 18, and the band tightening means 13 is fixed on the base plate 1. a support frame 22 and a tightening shaft rotatably supported by the support frame 22 and arranged parallel to the receiving plate 15, having a rotation knob 23 at the rear end and a cut-in portion 24 at the tip. 25
and a gear 2 provided coaxially with this tightening shaft 25.
6, and a reversal prevention mechanism consisting of a locking pawl 27 that locks onto this gear 26.

In the coils shown in FIGS. 4 to 7, a bobbin 1 around which the coils 4a and 4b are wound
A and 1b are combined with a cut core 6, and the winding start end 9a of the tightening band 9 is welded to the outside of the cut core 6 using arcon gas. In this case, since the tightening band 9 is made of stainless steel and the cut core 6 is made of a silicon steel plate, spot welding is not used or is not appropriate, so argon arc welding is preferably performed. Then, the main body of the tightening band 9 is wound around the outer periphery of the cut core 6, and the threaded rod 18 is further turned to fix and hold the coil between the presser 21 and the receiving plate 15. Then, the other end of the tightening band 9 opposite to the winding start end 9a is fitted into the cut-in portion 24 at the tip of the tightening shaft 25, and the tightening shaft 25 is rotated to tighten the tightening band 9. A tightening band 9 is tightly attached to the outer periphery of the cut core 6. At this time, the tightening band 9 is pulled diagonally downward, and the tightening band 9 wrapped once around the outer periphery of the cut core 6 is placed on the winding start end 9a.
will be polymerized. Therefore, the tightening band 9
The winding start end 9a and the overlapping part are joined by spot welding, and this is used as the winding end 9b.The end from this winding end 9b to the end that is locked to the tightening shaft 25 is cut. do.

It should be noted that the tightening band tightening method of the present invention can be applied not only to the coil of the embodiment but also to a transformer having a cut core, and the coil having a cut core is not limited to the structure of the embodiment. do not have.

As described above, the cut core tightening band tightening method of the present invention involves welding the winding start end of the tightening band to the outside of the cut core using an argon gas arc.
By tightly wrapping this tightening band around the outer periphery of the cut core and spot-welding the end portion of the winding that overlaps the starting end of the winding to the starting end of the winding, the cut core is tightened and fixed as one body. The number of parts is small, assembly is easy, and product costs can be reduced.

Further, in the present invention, the winding start end 9a of the tightening band 9 is welded to the outer peripheral side surface of the stacked silicon steel plates by argon gas arc welding, and the winding end 9b of the tightening band 9 is welded to the winding start end. By stacking it on top of 9a and welding the overlapping part by argon gas arc welding, there are no unnecessary protrusions that are noticeable in appearance, the external shape can be made small, and the entire tightening band is in close contact with the outer periphery of the cut core. Since the coil is wound and the appearance is finished beautifully, the commercial value of the coil or transformer having the cut core can be increased.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a conventional embodiment, FIG. 2 is a partial plan view showing another conventional embodiment, FIG. 3 is a front view showing still another conventional embodiment, and FIG. 4 is a front view showing a conventional embodiment. A front view showing an embodiment of the invention, FIG. 5 is a side view, FIG. 6 is a plan view, FIG. 7 is a longitudinal front view, and FIGS. 8 and 9 are explanations of how to attach the tightening band. It is a diagram. 6...Cut core, 9...Tightening band, 9a...
... Winding start end, 9b... Winding end.

Claims (1)

[Claims] 1. In a coil or transformer having a cut core made of stacked silicon steel plates, the winding start end 9a of the tightening band 9 is welded to the side surface of the outer periphery of the stacked silicon steel plates of the cut core 6 by argon gas arc welding. A method for tightening a cut core tightening band, characterized in that the cut core 6 is tightly wound around the outer periphery of the cut core 6, overlapped with the outer circumferential surface of the winding start end of the tightening band 9, and spot welded.