JPS59143026A - Annealing device for iron core of electrical apparatus - Google Patents

Abstract

PURPOSE:To move easily an iron core for an electrical apparatus in an induction heating furnace without damaging the same in the stage of annealing the iron core by induction heating in the heating furnace by moving the iron core on many spherical or cylindrical rolling bodies made of a nonmagnetic material. CONSTITUTION:An iron core for an electrical apparatus is subjected to induction heating and cooling while it is moved in an induction heating furnace for annealing, thereafter the iron core is taken from the furnace. Many spherical or cylindrical rolling bodies 8 made of ceramics are preliminarily put in a nonmetallic receiving base 9 made likewise of ceramics at the bottom of the furnace. The iron core is placed on the objects 8 and is pushed by a pusher so as to be moved from the inlet to the outlet in the furnace. The spherical bodies are made larger in diameter on the outer side than on the inner side and the cylindrical bodies are provided with a recess having the width at which the iron core enters the recess in the central part of each body. Thus the snaking of the iron core in the furnace is prevented. Since the base 9 and the rolling bodies are made of nonmagnetic ceramics, the temperature elevation and the loss of the electric power owing to induced electricity is eliminated and the iron core moves easily on the bodies 8 without being damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an annealing apparatus using induction heating, which is mainly used for annealing cores of electrical equipment such as small electric motors and small transformers.

Conventional configuration and problems When annealing the core by induction heating, the core is moved by placing it on a heat-resistant conveyor (for example, a metal mesh belt) and feeding it into the heating coil fin, or by using a rail to move the core. The method used is to send it by sliding it upwards. The method of transporting the core on a conveyor is effective in the annealing process because the core itself is stationary, but eddy currents flow through the conveyor or non-magnetic metal, which consumes power and increases power consumption. It is at a disadvantage. On the other hand, when sliding on rails, it is difficult to select the material for the rails. That is, even if the rail is non-magnetic, the rail itself generates heat and the iron core slides on it, resulting in severe rail wear or scratches on the iron core. If the rail is made entirely of non-metallic materials, such as ceramics, the rail itself will not generate heat, but scratches C on the core itself will still occur. Furthermore, in the rail method, if the feeding direction becomes long, a large 7-year device is required, and a load is applied to the iron core under high temperature conditions, causing dimensional changes and the occurrence of sticking of the iron core, which is not desirable.

FIG. 1 shows an iron core annealing apparatus using a conventional induction heating method.

This equipment is a continuous type that performs heating and cooling completely continuously.
Iron core 1 weighed and clamped to a predetermined stacking height in advance
is fed into the furnace from the artificial side of the furnace core tube 2, which is used to secure an atmosphere of atmospheric gas, by means of a puno 7-year device 3. There is an induction heating coil 4 for heating on the outer periphery of the furnace core tube 2, and furthermore, a rail 5 for moving the iron core 1 is arranged inside the furnace core tube 2.

This rail 5 is usually made of non-magnetic metal, such as stainless steel or ceramics, and is continuous from the heating zone 6 to the cooling zone 7.

The iron core 1 is moved along one of the rails 5 from the heating zone 6 to the cooling zone 7 by the pusher device 3, and the annealing process is completed. As described above, since the frictional force between the iron core 1 and the rail 5 becomes large in the rail 6 which is continuous from the heating zone 6 to the cooling zone 7, the pusher device 3 has to be large. Furthermore, a large force in the feeding direction is applied to the high-temperature cores in the first half of the heating zone 6 and the cooling zone 7, and as a result, sticking often occurs between the laminated layers of the core 1. An iron core in which this sticking occurs is disadvantageous because it causes eddy current loss and significantly impairs the characteristics of the equipment. One idea that was considered was to move the heating zone 6 on rails and use a conveyor system in the cooling zone.

In this method, a conveyor is not used in the heating zone 6, so
There is no reduction in heating efficiency, and the proportion of white-skinned heat in the furnace head is small, so the frictional force of the iron core is reduced to +lJ, so the pump/year device can be made smaller.

However, although the problem of sticking has been reduced compared to the former, it is not completely eliminated, and countermeasures against sticking are required in the post-process.

Purpose of the Invention The present invention has been made in view of the above-mentioned conventional drawbacks, and it is an object of the present invention to provide a complete annealing device in which the core can be easily moved by a small pusher device and in which no unreasonable load is applied to the core. be.

Structure of the Invention The present invention provides a heating coil in which a spherical or cylindrical rolling object made of a non-metallic material with good heat resistance, such as ceramics, is placed on a stand made of a similar material. When the iron core resting on this rolling object is pushed from the outside, the rolling object rotates on its axis (~, making the movement of the iron core easier).

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 2 shows one embodiment of the present invention, and is a side view of a core feeding device within the heating zone. The iron core 1 is made of a non-metallic material (for example, ceramics) so that it can be easily moved over a spherical or cylindrical rolling object 8 placed in a stand 9 by the force of a pusher device. ing. This prevents the object 8 from rolling and rotating in the same direction when the iron core 1 attempts to move due to the force from the pusher device. Figure 3, 4th Doctor The rolling object 8 and the receiver show the structure of the table 9. For example, the receiver made of + Laminox is box-shaped with a shallow bottom, and the rolling object 8 is placed inside. The two sides of the receiver are slightly higher than the sides of the stand 9. When the rolling object 8 is cylindrical, the fourth
As shown in the figure, the circumferential direction is aligned with the moving direction.

Further, these spherical objects and cylindrical objects constituting the rolling object 8 are arranged in a mutually clear run so that the supports can freely rotate on their own axis. The base 9 and the melting object 8 of these receivers are made of non-metallic heat-resistant materials, such as ceramics, so they do not generate self-heating like metals due to induction heating, and have a small heat capacity. , an increase in power consumption can be avoided.

Further, since the operating temperature is at most 900° C., there is no need to use a special material, and even if wear resistance is taken into account, it may be made of, for example, 90 to 95 degrees Celsius or Al2O3. This material is commercially available as grinding balls, is easily available, and is inexpensive. Furthermore, when feeding the iron core, the rolling object 8 becomes easily movable due to its rotation, but at the same time there is a risk that it will wobble or meander in the direction of travel. In this case, as shown in FIG.
Dimensions at the center in the direction wl Make some diameters smaller to match the dimensions of the iron core. FIG. 6 shows a side view of the rolling object 8 actually placed on the receiver 9 and the iron core fed into it. Furthermore, FIG. 7 shows a view seen from the core feeding direction. The rollers of the iron core 1 ride on the narrow diameter portion 8a of the steel body 8, and the step serves as a guide, so that the iron core 1 is sent forward without meandering.

FIG. 8 shows a case where the rolling object 8 is composed of balls, in which a ball sbl with a large outer diameter in the width direction is arranged in accordance with the dimensions of the iron core 1, and a ball Bcf with a small diameter is arranged in the center, and the iron core 1 is arranged with a ball 8c with a small diameter. The upper part is kited by a ball 8b with a large diameter and moves forward. Since the present invention is disposed within a heating coil, its size is limited in terms of heating efficiency, and it is desirable that it be as chevron-shaped and thin as possible.

Effects of the Invention As is clear from the above explanation, according to the present invention, the iron core can be easily moved with a slight amount of grooving to the iron core.
This not only reduces the size of the gutsher device, but also prevents deformation and sticking of the core, further increasing the effect of annealing by induction heating.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a schematic configuration of a conventional annealing apparatus using induction heating, FIG. 2 is a side view of a core feeding section of an annealing apparatus according to an embodiment of the present invention, and FIG. Fig. 4 is a perspective view of the core feeding section, Fig. 5 is a perspective view showing a modified example of the rolling object constituting the core feeding section, and Fig. 6 is a side opening of the core feeding section using the rolling object. , FIG. 7 is a front view as seen from the core feeding direction, and FIG. 8 is a front view of a core feeding section according to another embodiment of the present invention as seen from the core feeding direction. 1... Iron core, 2... Furnace core tube, 3...
...Pusher device, 4@...Induction heating coil 55ees■Heating zone, 7...Cooling zone, 8...
...Rolling object, 9...The receiver is a stand. Figure 1? 5 / Figure 2 / Figure 3 Figure 4 Figure 5 Figure δ Figure 7 Figure 8

Claims (3)

[Claims] (1) A cooling zone is provided connected to the heating zone which is equipped with all the induction heating coils, and the receiver made of non-magnetic material installed inside the heating coil is mounted on the stand, and a plurality of rolling non-magnetic materials are used to move the iron core. An annealing device for an electrical equipment iron core, which is provided with a rotatable object and a pusher device for moving the iron core installed on the rolling object. (2) The annealing of an electrical equipment iron core according to claim 1, wherein the roller 9 object is constituted by a cylindrical non-metallic body, and a small diameter portion is provided in the center thereof over a width at least larger than the iron core dimension. Device. (3) The rolling object is composed of non-metallic balls, and the ball installed in the center of the stand has a small diameter, and the balls installed on both sides have a large diameter, and the large diameter balls guide the iron core. An annealing apparatus for an electrical equipment core according to claim 1.