JPS6281954A - Rust preventive method for squirrel-cage rotor - Google Patents

Abstract

PURPOSE:To perform the fixing and rust prevention of the secondary conductor at a low cost and in a short time by coating the rotor core with adhesive resin capable of both anaerobically hardening and hardening by means of ultraviolet light to make the resin partly infiltrate into the slot and then by irradiating it with ultraviolet light. CONSTITUTION:Into a slot 4a of a rotor core 4 the second conductor 6 cut in predetermined dimensions is inserted as if fitted somewhat forcibly, and is temporarily fixed. Then the whole outside peripheral surface of the rotor core 4 is coated with an adhesive resin 9 which is capable of both anaerobically hardening and hardening by means of ultraviolet light. A part of this adhesive resin 9 infiltrates into a slot 4a. Then, by irradiation of ultraviolet light the adhesive resin 9 is hardened.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a cage rotor rust prevention method for rust preventing a cage rotor formed by inserting secondary conductors into the throwers 1 to 1 of the rotor core. .

[Technical background of the invention and its problems] Rotors of medium to large-sized models are manufactured by inserting and fixing secondary conductors into slots in the rotor core and turning the outer peripheral surface of the rotor. . In this case, since the secondary conductor is not formed by casting aluminum or the like as in small models, but is attached by insertion, a wedge is inserted between the secondary conductor and the inner surface of the slot to prevent it from wobbling. It is fixed by driving it in. In addition, the turned surface needs to be rust-proofed, and for this purpose, a rust-preventive paint is applied after turning.

However, the work of driving wedges for fixing the secondary conductor is quite troublesome. In addition, the outer peripheral surface of the rotor core near the secondary conductor receives heat from the secondary conductor and reaches a considerably high temperature, so it is necessary to use anti-corrosion paint with excellent heat resistance. Generally, a hardened type is used for baking. For this reason, it becomes necessary to heat a rotor coated with anti-M paint and weighing from several hundred Ko to several tons in a heating furnace, which requires a large amount of heating energy and requires a long time for heating and cooling. However, there were problems in that energy costs were high and manufacturing days were unavoidably prolonged.

In order to deal with these problems in curing of anti-rust paints,
The use of ultraviolet curable paints that do not require heating or room temperature curable paints as rust preventive paints is being considered.

However, if UV-curable anti-corrosion paint is applied in an amount sufficient to exert a sufficient anti-rust effect, it will penetrate into the gap between the secondary conductor and the inner surface of the slot, so the permeated anti-rust paint will It becomes impossible to irradiate the material with ultraviolet rays, making it impossible to cure it, resulting in the problem that the uncured anticorrosive paint scatters during rotation. In addition, anti-#J paints that cure at room temperature have poor heat resistance and curing reliability, and many practical problems remain.

[Object of the Invention] The present invention has been made in view of the above circumstances, and its purpose is to provide a protection for a cylindrical rotor that can securely fix secondary conductors and prevent rust at low cost and in a short time. There are rust methods available.

[Summary of the Invention] After inserting the secondary conductor, the present invention applies an adhesive resin capable of both anaerobic curing and ultraviolet curing to the surface of the rotor core whose outer circumferential surface has been turned, thereby partially curing the rotor core. By infiltrating into the slots and applying ultraviolet rays to the surface of the rotor core, the adhesive resin that has penetrated into the slots is anaerobically cured, and the adhesive resin on the surface is cured by ultraviolet rays, thereby providing rust prevention and secondary effects. The feature is that the secondary conductor can also be fixed at the same time.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

First, the second section indicates the pause of adhesive resin application and curing equipment.
In the figure, reference numeral J'3 indicates a base, and 2 indicates two pairs of support rollers provided on both sides of the base 1. 3 is a rotor with a well-known configuration,
This fixes the rotating shaft 5 at the center of the rotor core 4, and as shown in FIG. Short-circuited with a short-circuit ring. Reference numeral 7 indicates an application roller rotatably provided on the base 1 so as to be in contact with the outer peripheral surface of the rotor core 4, and 8 indicates an ultraviolet irradiation device provided above the rotor core 4.

Now, in the above configuration, the rotor 3 is temporarily fixed by press-fitting the secondary conductor 6 cut to a predetermined size into the slot 4a of the rotor core 4, and then temporarily fixing the secondary conductor 6 into the slot 4a of the rotor core 4.
Both ends of the rotating shaft 5 are supported on support rollers 2, 2, with the outer circumferential surface of the rotary shaft 5 being machined. Thereafter, an adhesive resin 9 that can be both anaerobically cured and ultraviolet rays cured is applied to the entire outer circumferential surface of the rotor core 4 via a coating roller 7 .

As a result, the adhesive resin 9 applied to the outer peripheral surface of the rotor core 4 forms a film with a uniform thickness over the entire outer peripheral surface of the rotor core 4, as shown in FIG. It penetrates into the gap between the inner surface of the slot 4a of the child core 4 and the secondary conductor 6. Next, while rotating the rotor 3, the outer peripheral surface of the rotor 3 is irradiated with ultraviolet rays by the ultraviolet irradiation device 8. The adhesive resin 9 is, for example, Nippon Locktie 1 to #32 manufactured by Co., Ltd.
5, and has the property of being hardened and covered with earth and sand by shielding it from the air or irradiating it with ultraviolet rays. Therefore, slot 4
The adhesive resin 9 that has permeated into the slot 4a becomes shielded from the air, so it hardens within the slot 4a by a fraction of the earth and sand, and the adhesive resin 9 that has formed a coating on the outer peripheral surface of the rotor core 4 is protected from ultraviolet rays. After receiving irradiation 01, it hardens with about a few pieces of earth and sand. As a result, the secondary conductor 6 in the slot 4a is completely fixed by the adhesive resin 9 that has penetrated into the slot/Ia, and wobbling is reliably prevented. It is covered with a film that isolates it from the outside air, ensuring reliable rust prevention. According to a test using the above-mentioned adhesive resin 9, it had sufficient corrosion resistance equivalent to type 8 insulation, and there was no practical problem with the corrosion resistance.

According to this embodiment, the adhesive resin 9 applied for rust prevention can be cured by irradiation with ultraviolet rays after application without heating, which would have required a heating furnace of 1. Compared to conventional methods, energy consumption can be significantly reduced. Moreover, even with a large rotor 3, the hardening time can be completed in an extremely short time of only a few minutes of dirt and sand, so the work time that conventionally required days for heating and cooling can be reduced to minutes. The working time can be reduced. In addition, by utilizing the fact that the adhesive resin 9 applied to the outer surface of the rotor core 4 permeates into the slots 4a, the secondary conductor 6 is fixed by the adhesive resin 9 that permeates into the slots 4a. Therefore, it is no longer necessary to drive a wedge to prevent rattling of the secondary conductor 6, which further reduces the number of manufacturing steps and further improves manufacturability.

In the above embodiment, the adhesive resin 9 was applied to the rotor core 4 using the application roller 7, but the present invention is not limited to this, and for example, a spray method or a brush application method may be used. Moreover, in addition to these, adhesive resin may be applied only to the slot 48 portion in a larger amount ω. Furthermore, it goes without saying that the present invention can also be applied to the production of double penalty type rotors.

[Effects of the Invention] As described above, the present invention applies an adhesive resin capable of both anaerobic curing and ultraviolet curing to the rotor core whose outer peripheral surface has been turned, and partially inserts the rotor core into the thrower 1. This method has the advantage of being able to fix the secondary conductor in the slot and prevent rust on the turned surface at an extremely low cost and in a short time compared to conventional methods. It is something that plays.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which the first tooth is a partially enlarged sectional view of the rotor, and FIG. 2 is a perspective view showing an adhesive resin coating and curing device. In the drawing, 3 is a rotor, 4 is a rotor core, 4a is a slot, 6 is a secondary conductor, 7 is a coating roller, and 8 is an ultraviolet irradiation device.

Claims (1)

[Claims] 1. In a cage-shaped rotor that is rust-proofed by inserting a secondary conductor into the slot of the rotor core, after inserting the secondary conductor, the surface of the rotor core whose outer circumferential surface has been turned is subjected to anaerobic treatment. A method for preventing rust of a cage-type rotor, characterized by applying an adhesive resin that can be cured by both heat and ultraviolet rays, and allowing a portion of the adhesive resin to penetrate into the slots, and irradiating the surface of the rotor core with ultraviolet rays. .