JPH08243464A - Insulating varnish drying and curing apparatus - Google Patents

Abstract

PURPOSE: To provide an apparatus to safely and efficiently take out and remove an insulating varnish, which has dropped from a subject matter to be treated and hardened 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, impregnated with an insulating varnish, are suspended from and fixed in a hanger chain 11 installed in a drying and curing furnace 10, and the hangers 13 are made possible to be transported continuously or intermittently in horizontal direction. A belt conveyer 17 provided with an endless belt 16 made of a fluororesin is so installed along the transportation line of the hangers 13 under the hangers as to decline downward from an inlet part 14. The whole of the insulating varnish 19 which has dropped from the subject matter 12 to be treated drops and headened on the endless belt 16 and, by driving and running the endless belt 16, the varnish hardened material 21 can be taken out and removed.

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.

In such a drying and curing apparatus, conventionally, a plurality of divided trays 5 are juxtaposed on the floor surface 1a below the moving and conveying path of the hanger 4, and the insulating varnish 6 that drops from the object 3 to be processed. Receiving is carried out 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 carrier which horizontally runs in a drying-curing furnace equipped with a heating means and which holds an object to be treated impregnated with an insulating varnish. In an insulating varnish dry-curing device in which a plurality of hangers to be held are hung and fixed at predetermined intervals, at least a main surface is made of a material having good releasability along the transport path of the hangers. The endless belt is arranged so that it can run freely.

In the present invention, as the endless belt, a belt-shaped body having an endless (endless) ring shape and at least a main surface (a surface located on the outer side in a used state) made of a material having good releasability is used. To be done. Here, as the material having a good mold release property, polytetrafluoroethylene, polytrifluorochloroethylene, tetrafluoroethylene-
There are fluorine-based resins such as hexafluoropropylene copolymer, silicone-based resins, etc., and in addition to the belt formed by such a resin material, on the main surface of the belt made of metal or other resin, A belt coated with a resin material to form a releasable coating can also be used.

Further, in the present invention, the endless belt is inclined downward from the inlet of the dry-curing furnace in the conveying direction of the hanger so that the insulating varnish that falls in the initial stage of dry-curing can be completely taken out and removed. It is desirable to arrange so that. Furthermore, by placing a conventional tray made of metal or the like on the endless belt, the cured product of the varnish can be more easily taken out.

[0013]

In the insulating varnish dry curing apparatus of the present invention,
Since the endless belt, at least the main surface of which is made of a resin material having a good releasing property such as a fluororesin, is movably arranged below the transport path of the hanger, the endless belt is mounted and held on the hanger. The insulating varnish that falls from the object to be treated does not fall onto the floor surface of the furnace, but falls entirely onto the main surface of the endless belt, and accumulates there to cure. Then, after the varnish treatment work, the endless belt is driven to run, and the belt portion where the cured product of the insulating varnish is accumulated is taken out and moved to the vicinity of the door portion, so that the worker does not enter the furnace and the varnish is removed. The cured product can be easily taken out and removed.

Further, since the main surface of the endless belt is made of a material having a good mold releasability, it is easy to remove the cured varnish adhered and accumulated by peeling it off. After the removal, the endless belt can be appropriately driven and run again to start the varnishing work.

[0015]

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 dry-curing 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 belt conveyor 17 provided with an endless belt 16 made of a fluororesin is provided below and along the transportation path of the hanger 13 in the transportation direction of the hanger 13 from the inlet portion 14 of the drying and curing furnace 10. It is arranged so as to be inclined downwardly toward. That is, the belt conveyor 17 is an endless belt 1 made of a fluororesin having a good releasability such as polytetrafluoroethylene.
6 is bridged between a pair of belt pulley wheels 18 so that the upper main surface of the endless belt 16 is inclined downward in the transport direction of the hanger 13.
Floor 1 from 0 entrance 14 to hardened product removal door 15
It is installed on 0a.

In the insulating varnish dry-curing apparatus of the embodiment thus constructed, the insulating varnish 19 falling from the object 12 to be processed mounted on the hanger 13 is the floor surface 1 of the furnace.
All of them fall onto the endless belt 16 and harden without falling to 0a.

Therefore, after the varnish processing work, the worker 20 drives the belt conveyor 17 from outside the drying and curing furnace 10 to take out the portion of the endless belt 16 on which the cured varnish 21 has adhered and stayed near the door portion 15. By moving the varnish cured product 21, the worker 20 can safely remove the varnish cured product 21 in a short time without entering the furnace. Further, since the endless belt 16 is formed of a fluororesin having a good releasability, the cured varnish 21 accumulated on the endless belt 16 can be easily peeled off and removed, and after the removal, the endless belt 16 is left as it is or again. By appropriately traveling, the non-adhesive portion of the endless belt 16 can be arranged below the transport path of the hanger 13, and the varnishing operation can be started again.

Further, the main surface of the endless belt 16 is
Since it is arranged so as to be inclined downward from the inlet portion 14 of the dry-hardening furnace 10 toward the transportation direction of the hanger 13,
The insulating varnish 19 that drops at the initial stage when the object to be treated 12 has just entered the drying and curing furnace 10 is also the endless belt 1.
It does not fall from the bent end portion of 6 to the floor surface 10a, and all stays on the endless belt 16 and hardens.

[0021]

As is apparent from the above description, according to the insulating varnish dry-curing apparatus of the present invention, all the insulating varnish falling from the object to be treated is received by the main surface of the endless belt having a good releasability. Since they can be cured by curing, it is possible to prevent the trays from being fixed by the cured varnish.

Therefore, the worker can safely take out and remove the cured varnish without entering the furnace. In addition, since it is not necessary to perform extra work in advance, the work of removing the hardened varnish, which conventionally took about 1 day, can be done in 1
It can be performed in a short time of about an hour, and the operating rate is significantly 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 and curing furnace 11: Hanger chain 12: Processed object 13: Hanger 16: Endless belt 17: Belt conveyor 19: Insulation varnish 21: Varnish hardening Stuff

Claims (3)

[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 an apparatus for drying and curing an insulating varnish that is suspended and fixed, an endless belt, at least a main surface of which is made of a material having good releasability, is movably disposed below the transport path of the hanger. An insulating varnish dry-curing device characterized by the above. 2. The insulating varnish dry-curing device according to claim 1, wherein the material having a good releasing property is a fluororesin. 3. The insulating varnish drying according to claim 1, wherein the endless belt is arranged so as to be inclined downward from an inlet of the dry-curing furnace toward a conveying direction of the hanger. Curing device.