JPH08243468A - Insulating varnish drying and curing apparatus - Google Patents

Abstract

PURPOSE: To safely and efficiently take out and remove an insulating varnish, which has dropped from a subject matter to be treated and cured in a drying and curing furnace, from the furnace. CONSTITUTION: At a constant gap, a plurality of hangers 13 to mount on a subject matter 12 to be treated impregnate with an insulating varnish are suspended from and fixed inn a hanger chain 11 installed in a drying and curing furnace 10, and the hangers 13 are transported continuously or intermittently in horizontal direction. A plurality of receiving saucers 16 are arranged under the hangers 13 along the transportation line of the hangers 13 and roof-shaped guide bodies 17 are installed above the receiving saucers 16 so as to cover the gap parts of the receiving saucers 16. The insulating varnish 19 which drops from the subject material 12 for treatment to the guide bodies 17 flows and falls on the tilting faces of the guide bodies 17 and is collected either one of neighboring receiving saucers 16 and becomes hard in the saucers 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulating varnish dry-curing device, and more particularly, to an insulating varnish that has fallen from a material to be processed and hardened in a dry-curing furnace and can be easily taken out of the furnace and removed. Dry curing device.

[0002]

2. Description of the Related Art As a method of insulating a stator coil (stator coil) of an electric motor, a generator or the like, or an electric equipment part such as a transformer, a dipping method is used in which an object to be processed is dipped in an insulating varnish having a low viscosity to be impregnated. However, in recent years, a continuous impregnation treatment method in which all the steps such as impregnation and curing are continuously performed automatically has become mainstream.

FIG. 2 shows a drying and curing apparatus used in such a method for continuously impregnating an insulating varnish. In this apparatus, a hanger chain 2 traveling in a horizontal direction is arranged in a drying and curing furnace 1 equipped with a heating means, and a plurality of hangers 4 for mounting an object 3 to be processed such as a stator coil on the hanger chain 2. Is suspended and fixed at a predetermined interval, and the workpiece 3 is configured to be moved continuously or intermittently in the drying and curing furnace 1 by the hanger 4 and the hanger chain 2.

Further, in such a drying and curing apparatus, conventionally, an insulating varnish that drops from the object 3 to be processed is provided by arranging a plurality of divided trays 5 in parallel on the floor surface 1a below the moving and conveying path of the hanger 4. 6 is stored in the receiving tray 5.

That is, the insulating varnish impregnated in the object to be treated 3 has a very low viscosity and is easily dropped, and the insulating varnish 6 that has dropped in drops is accumulated on the floor surface 1a and hardens to gradually accumulate. Then, when the accumulated cured varnish 7 exceeds a certain amount, there is an inconvenience such as coming into contact with the hanger-4 or the like and tipping over. Therefore, it is necessary to take out the varnish cured product 7 out of the furnace on a regular basis, and in order to facilitate this taking out, the saucer 5 is juxtaposed on the floor surface 1a of the drying and curing furnace 1 along the transportation path of the hanger 4. The falling varnish 6 is received, and the stagnant varnish cured product 7 is pulled out together with the pan 5 and removed from the furnace.

Further, in such a tray 5,
In order to facilitate the peeling of the varnish cured product 7, the whole is made of a resin having excellent releasability such as polytetrafluoroethylene, or a releasable film is formed on the inner peripheral surface of the metal tray. The method such as doing is adopted.

[0007]

However, in such a conventional insulating varnish dry-curing device, the insulating varnish 6 drops uniformly along the conveying path of the hanger-4, so that the space between the trays 5 is reduced. The cured varnish 7 also accumulates in the inner part of the furnace, and the adjacent trays 5 are fixed to each other by the cured varnish 7.

Therefore, it is difficult to take out the tray 5 from the cured product take-out door portion 8 provided in the rear part of the furnace as it is, and first, the worker 9 enters the narrow dry hardening furnace 1 and is fixed with the varnish cured product 7. Since it is necessary to perform the work of dividing the tray 5, there is a problem that the operating rate is significantly reduced. That is, since it is impossible for the worker 9 to stand and work in the dry curing furnace 1 as it is, the varnish cured product 7 fixed between the trays 5 is removed by a hammer or the like after removing the hanger 4 and the like. Not only was it necessary to perform the work of knocking it down, it was not only time-consuming and labor-intensive, but also the device had to be stopped for a long time during the work.

The present invention has been made to solve such a problem, and an insulating varnish that can be efficiently taken out of the furnace and removed from an insulating varnish that has fallen from an object to be processed and hardened in a dry hardening furnace. It is intended to provide a dry curing device.

[0010]

An insulating varnish dry-curing apparatus according to the present invention comprises a long-length carrier that horizontally runs in a dry-curing furnace equipped with a heating means for treating an object to be treated impregnated with an insulating varnish. A plurality of hangers to be held are suspended and fixed at predetermined intervals, respectively, and a plurality of trays for receiving an insulating varnish falling from the object to be processed are arranged below the hangers along a transportation path of the hangers. In the varnish dry-curing device, a plurality of upwardly convex guide bodies are arranged above the trays so as to cover the intermediate portions of two adjoining trays, and the falling insulating varnish is guided to the trays. It is characterized in that it is configured to.

In the present invention, it is desirable to use, as the guide body for guiding the falling insulating varnish to each tray, one made of a heat resistant material such as a fluororesin such as polytetrafluroethylene or a metal. The shape of the guide body is preferably a mountain shape in which one flat plate is bent into a mountain shape or a roof shape. However, the direction in which all of the insulating varnish dropped on the upper surface of the guide body falls is determined by using one of two adjacent trays. The shape is not limited to the roof shape, and may be any shape such as a hemispherical shape or an umbrella shape as long as it can be controlled in that direction.

[0012]

In the insulating varnish dry curing apparatus of the present invention,
Since a plurality of upwardly convex guide bodies are arranged above the saucer arranged in the dry-curing oven so as to cover an intermediate portion between two adjacent saucers, the guide body is mounted and held on the hanger. All of the insulating varnish falling from the object to be processed is guided to one of the two saucers described above by the convex surface of the guide body, and is accumulated and hardened there.

Therefore, the insulating varnish does not drop and stay in the gap between the pans or the back of the furnace, and the pans are not fixed by the hardened cured product of the insulating varnish. Therefore, the tray can be easily pulled out from the dry-curing oven, and the cured varnish can be safely removed in a short time without the operator having to enter the oven.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram schematically showing an embodiment of an insulating varnish drying and hardening apparatus of the present invention. In the figure, reference numeral 10 indicates a dry-curing furnace equipped with a heating means, inside which a hanger chain 11 which runs in the horizontal direction is arranged. In addition, a plurality of basket-shaped hangers 13 on which an object to be treated 12 such as a stator coil impregnated with insulating varnish in the previous step (varnish dipping step) is mounted are hung on the hanger chain 11 at regular intervals. It is fixed down. Then, these hangers 13 are continuously or intermittently conveyed by the hanger chain 11, and along the conveying path that returns from the inlet portion 14 to the cured product take-out door portion 15 and returns to the inlet portion 14 in the drying and curing furnace 10.
It is moving and circulating.

A plurality of trays 16 are juxtaposed on the floor surface 10a below the hanger 13 along the transportation path, and the trays 16 have the following shapes above them. Two guide pans 16a, 16b adjacent to each other so that the guide body 17 covers the intermediate portion between the pans 16
It is arranged over. That is, this guide body 17
Has a roof-like shape in which one flat plate is bent in a mountain shape, and the conveying path of the hanger 13 and the tray are provided so that the inclined plates 17a and 17b on the left and right sides cover the two trays 16a and 16b, respectively. It is arranged in the space between 16 and. Then, it is attached to the furnace wall by an attachment member 18 attached to the top (folded curve portion).

In the insulating varnish dry-curing apparatus of the embodiment thus constructed, the insulating varnish 1 which drops from the object 12 mounted on the hanger 13 onto the guide body 17 is provided.
9 flows down on either of the left and right inclined plates 17a and 17b, reaches the tray 16 located below the end of the inclined plate, and accumulates therein and hardens.

Therefore, the insulating varnish 19 is used as the saucer 16
It does not fall to an intermediate portion between a and the receiving tray 16b or the like to be attached and retained, and the receiving trays 16 are not fixed to each other by the cured product 20 of the insulating varnish that has dropped. Then, the varnish cured product 20 is taken out and removed after the varnish treatment work by the operator 21 operating a rod-shaped jig or the like from outside the drying and hardening furnace 10 to pull out the tray 16 from the door portion 15. In this way, the cured varnish 20 can be safely taken out and removed in a short time, and the operator does not have to enter the furnace, so that the operation rate is improved and maintenance is not troublesome.

[0019]

As is apparent from the above description, according to the insulating varnish dry-curing apparatus of the present invention, the position of the insulating varnish dropping from the object to be processed is controlled, and all the varnish is accumulated in the pan and cured. Therefore, it is possible to prevent the saucers from sticking to each other due to the cured varnish.

Therefore, the worker can safely take out and remove the cured varnish in a short time without entering the furnace, the maintenance work is not troublesome, and the operation rate is remarkably improved.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing an embodiment of an insulating varnish dry-curing device of the present invention.

FIG. 2 is a diagram schematically showing a conventional insulating varnish dry-curing device.

[Explanation of symbols]

 10 ... Drying oven 11 ... Hanger chain 12 ... Object to be treated 13 ... Hanger 16 ... Receiving tray 17 ... Guide body 19 ... Insulating varnish 20 ... Hardened varnish

Claims (1)

[Claims] 1. A plurality of hangers for holding an object to be treated impregnated with an insulating varnish are provided at predetermined intervals on a long carrier horizontally running in a drying and curing oven equipped with a heating means. In the insulating varnish dry-curing device, in which a plurality of trays for receiving the insulating varnish falling from the object to be processed are arranged along the transportation path of the hanger and fixed therebelow, a plurality of trays are provided above the tray. The upward convex guide body,
An insulating varnish dry-curing device, characterized in that the insulating varnish is arranged so as to cover an intermediate portion of two adjoining saucers, and the dropping insulating varnish is guided to each of the saucers.