JPH06269714A - Varnish applying device - Google Patents

Abstract

PURPOSE:To stabilize the quality of an insulated electric wire to be finally produced and to provide a varnish applying device by which the operation need not be suspended when varnish is exchanged. CONSTITUTION:An applying roll 13 is freely rotatably fixed in a varnish bath 11 so that a part of the roll is dipped in the varnish 12. A varnish storage tank 15 contg. the varnish 12 is connected to the bath 11 through a feed pipe 16, a fixed delivery pump 17 is provided at a specified position of the feed pipe 16, and a level gage 18 is set in the bath 11. The level gage 18 is electrically connected to a control part 19 so that an output signal is transmitted to the gage, and the control part 19 is electrically connected to the pump 17 to transmit a control signal to the pump.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a varnish coating device for filaments such as enamel electric wires.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, a varnish coating device 60 for coating varnish on the surface of a linear body 61 is provided, and the linear body 61 having the surface coated with varnish is transferred to a horizontal printing machine 62. It is being sent out.

As shown in FIG. 7, a varnish applicator 60 has an applicator bath having a varnish bath 72 for containing a varnish 71 therein and a varnish receiver 73 for receiving the varnish 71 flowing out from the varnish bath 72. It has a part 74. Inside the varnish bath section 72, an application roller 75 is rotatably attached so that a part thereof is immersed in the varnish 71.

Further, a supply pipe 78 is disposed via a pump 77 between the varnish bath section 72 and the varnish storage tank 76 provided below the applicator buzz section 74. On the other hand, below the varnish receiving portion 73, a discharge path 79 reaching the varnish storage tank 76 is provided.

In such a varnish coating device 60,
The varnish 71 is continuously supplied from the varnish storage tank 76 to the varnish bath section 72 continuously by the pump 77, and the excess varnish 71 overflowing from the varnish bath section 72 is varnish receiving section 73.
Then, it is returned to the varnish storage tank 76 via the discharge path 79. As a result, the amount of varnish 71 that is larger than the amount used is always supplied and circulated.

Further, as shown in FIG. 8, when the applicator bath portion 74 and the varnish storage tank 76 are installed separately from each other, between the discharge side of the applicator bath portion 74 and the varnish storage tank 76. A pump 82 is also attached to the arranged discharge pipe 81.

The varnish 71 circulated as described above has poor workability if the viscosity is too high or too low. Varnish 7
The relationship between the viscosity of 1 and the temperature is as shown in FIG. The varnish 71 exhibits a viscosity excellent in work efficiency at 30 to 60 ° C. Therefore, the varnish 71 is applied to the applicator bath section 74 so that the temperature of the varnish 71 is maintained at 30 to 60 ° C.
The heating means 80 provided in the varnish storage tank 76 heats and controls it.

[0008]

In the conventional horizontal varnish coating apparatus 60 as described above, the varnish 71 is 30 to 60 ° C.
The varnish 71 is circulated in the state where the temperature is maintained. However, as shown in FIG. 10, the varnish 71 is more likely to deteriorate as the temperature increases. Therefore, the circulated varnish 71 gradually deteriorates, and the electrical characteristics of the finally manufactured insulated wire deteriorate. The same inconvenience occurs when the varnish 71 deteriorates not entirely but partially. As a result, in the conventional varnish coating device 60, it is necessary to stop the work and frequently replace the varnish 71.

The present invention has been made in view of the above points, and it is possible to stabilize the quality of an insulated wire to be finally manufactured, and it is not necessary to stop the work for replacing the varnish. I will provide a.

[0010]

According to the present invention, there is provided a varnish bath portion containing a predetermined volume of varnish, and a coating rotatably mounted inside the varnish bath portion so as to be partially immersed in the varnish. Roll, a varnish supplying means for supplying the varnish to the varnish bath section at a supply amount corresponding to the consumption amount of the varnish, and a level meter for detecting the liquid level of the varnish contained in the varnish bath section, Control for controlling the varnish supply means according to the detection signal from the level meter to appropriately change the supply amount of the varnish to maintain a constant liquid level of the varnish contained in the varnish bath section. A varnish coating device comprising:

[0011]

According to the varnish coating apparatus of the present invention, since the varnish supplying means supplies the varnish from the varnish container to the varnish bath portion in a supply amount corresponding to the consumption amount of the varnish, the varnish is applied to the filamentous body. The varnish consumed by is always replenished. On the other hand, when the consumption of varnish is higher or lower than expected, the control means detects the change in the liquid level of the varnish with the level meter, and the varnish supply amount is changed accordingly. Therefore, the liquid level of the varnish housed inside the varnish bath is maintained constant.
As a result, the varnish is always supplied and used in a new state without being circulated.

[0012]

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is an explanatory view showing an example of the varnish coating apparatus of the present invention.

Reference numeral 11 in the drawing is a varnish bath section for containing a predetermined volume, for example, 1 liter of varnish 12. Inside the varnish bath section 11, a coating roll 13 is rotatably attached so that a part thereof is immersed in the varnish 12. On the peripheral surface of the coating roll 13, as shown in FIG. 2, a linear body (wire diameter 0.02 mm to
0.5mm copper wire, aluminum wire, gold wire or alloy wire) 1
A groove 22 through which the No. 4 is sent is formed along the circumferential direction. The groove 22 is a linear member 14 that is hung on the coating roll 13.
Are formed at predetermined intervals by a number (100) corresponding to the number of (for example, 10) and the number of draws (for example, 10).

On the other hand, to the varnish bath section 11, a varnish container 15 containing the varnish 12 is connected via a supply pipe 16. A metering pump 17 is provided at a predetermined position of the supply pipe 16. Here, the supply port of the supply pipe 16 to the varnish bath section 11 side may be supplied from one location of the varnish bath section as shown in FIG.
When it is large, it is preferable to supply from multiple locations. For example, as shown in FIG. 3, supply ports 32, 33, 34 may be provided in the vicinity of both side surface portions 31a, 31b and front surface portion 31c of the varnish bath portion 31, respectively. Further, as shown in FIG. 4, the coating roll 1 is formed on the bottom surface of the varnish bath section 11.
Even if the supply pipe 41 is arranged along the longitudinal direction of the varnish 3 and a plurality of discharge holes 42 are formed in the peripheral surface thereof, the varnish bath section 11
The same effect as that of providing the supply ports at a plurality of positions can be obtained.

The heater 2 is provided near the supply pipe 16.
1. A varnish 1 which is arranged and passes through the inside of the supply pipe 16.
It is also possible to heat 2 to 30-60 ° C. In this case, since it is not necessary to provide the heater 21 in the varnish container 15, the varnish can be directly supplied from the drum or the can containing the varnish 12.

Inside the varnish bath section 11, a level meter 18 is installed. The level meter 18 is electrically connected to the control unit 19 so that the output signal is transmitted. Further, the control unit 19 is electrically connected so as to output a control signal to the metering pump 17.

A varnish coating apparatus 1 having such a structure
With 0, the varnish 12 is applied to the filament 14 as follows. That is, the linear body 14 travels toward the printing apparatus 20 while being fed through the groove 22 of the coating roll 13 by the driving means (not shown). At this time,
The coating roll 13 is rotated by the frictional force of the filament 14. Then, the varnish 12 held inside the groove 22 is transferred to the surface of the linear body 14. Since the varnish 12 has a constant viscosity, the varnish 12 is held so as to fill the inside of the groove 22 and the filament 14 passes through the inside of the groove 22. 12 is applied.

In this way, the varnish 12 for the linear body 14
While the coating is being performed, the varnish 12 is supplied according to the flowchart shown in FIG. 5 as follows.

First, the control unit 19 controls the metering pump 17 to supply the varnish 12 at a constant supply amount (5
1). The supply amount of the varnish 12 at this time is based on the diameter of the filament 14, the number of lines, the linear velocity, the concentration of the varnish, and the thickness of the coating film in the finally obtained insulated wire (hereinafter referred to as the target coating thickness). , According to the following equations (1) and (2).

[0021]

[Equation 1] In the formulas (1) and (2), each symbol is as follows.

Striatum diameter: d (mm) Number of lines: A (lines) Linear velocity: V (m / min) Varnish concentration: x (%) Target coating thickness: s (mm) For example, striatum diameter : D 0.05 mm Number of coatings: A 10 linear velocity: V 200 m / min Concentration of varnish: x 25% Target coating thickness: When s 0.005 mm, the cross-sectional area s of the coating is approximately 1 according to formula (1). 0.0008
64mm ² , and the amount W used by formula (2) is 6.912ml.
/ min was decided.

The supply amount thus determined (hereinafter,
A varnish 12 of a standard supply amount) is supplied to the varnish bath section 11 from the varnish storage tank 15 through the supply pipe 16 by the metering pump 17.

Next, the level meter 18 detects the liquid level (L) of the varnish 12 contained in the varnish bath section 11 (52). The detection signal from the level meter 18 is transmitted to the control unit 19. The control unit 19 outputs a control signal to the supply pump 17 according to the liquid level of the varnish 12,
The supply amount of the varnish 12 is controlled. That is, when there is no change in the liquid level, the varnish 12 is continuously supplied at the standard supply amount. When the liquid surface level rises, the amount supplied by the metering pump 17 is decreased (53). on the other hand,
When the liquid level is lowered, the amount supplied by the metering pump 17 is increased (54).

With the above control, the varnish bath section 11
The liquid level (L) of the varnish 12 housed inside is kept constant.

As described above, according to the varnish coating apparatus 10 of this embodiment, the metering pump 17 is controlled by the controller 19.
By controlling the varnish storage tank 15 to the varnish bath section 11,
The varnish 12 is supplied at a standard supply amount according to the consumption amount of the varnish 12. As a result, the varnish 12 consumed by the application of the varnish 12 to the filament 14 is constantly replenished, so that new varnish 12 is supplied as needed.

On the other hand, when the consumption amount of the varnish 12 is larger or smaller than the amount calculated as described above, the change in the liquid level of the varnish 12 is detected by the level meter 18, and the varnish 12 is correspondingly detected. The supply amount of is appropriately changed. In this way, the liquid level of the varnish 12 housed inside the varnish bath section 11 can always be kept constant.
Therefore, the varnish 12 is supplied in a single-use type instead of a circulation type, and a new varnish 12 is always prepared in the varnish bath section 11 and applied to the filament body 14. As a result, varnish 1
It is possible to prevent deterioration of the electrical characteristics of the finally manufactured insulated wire due to the deterioration of item 2. Further, unlike the conventional circulation type varnish applicator, when the varnish 12 deteriorates, the work is not interrupted and the varnish 12 is not replaced, so that the work efficiency is significantly improved.

[0028]

As described above, according to the varnish coating apparatus of the present invention, the varnish can be supplied in a single-use type and a new varnish can be constantly coated on the surface of the filamentous body.
It is possible to prevent the deterioration of the electrical characteristics of the finally manufactured insulated electric wire due to the deterioration of the varnish. Further, unlike the conventional circulation type varnish coating device, it is not necessary to interrupt the work for replacing the deteriorated varnish, so that the efficiency of the varnish coating work is significantly improved. It has a remarkable effect.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a varnish coating apparatus of the present invention.

FIG. 2 is an explanatory diagram showing a main part of a coating roll in the varnish coating apparatus of the embodiment.

FIG. 3 is a perspective view showing a modified example of the supply port of the supply pipe in the varnish coating apparatus of the present invention.

FIG. 4 is a perspective view showing a modified example of the supply port of the supply pipe in the varnish coating apparatus of the present invention.

FIG. 5 is a flowchart showing the procedure of varnish supply control in the varnish coating apparatus of the present invention.

FIG. 6 is an explanatory view showing a facility for manufacturing a linear body provided with a conventional varnish coating device.

FIG. 7 is an explanatory view showing a conventional varnish coating device.

FIG. 8 is an explanatory view showing a conventional varnish coating device.

FIG. 9 is a characteristic diagram showing the relationship between the viscosity of varnish and temperature.

FIG. 10 is a characteristic diagram showing the relationship between the life of varnish and temperature.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Varnish coating device, 11 ... Varnish bath part, 12 ... Varnish, 13 ... Coating roll, 14 ... Striatum, 15 ... Varnish storage tank, 16 ... Supply pipe, 17 ... Fixed quantity pipe, 18 ... Level meter, 19 ... Control unit.

Claims (1)

[Claims] 1. A varnish bath section containing a predetermined volume of varnish, and a coating roll rotatably mounted inside the varnish bath section so as to be partially immersed in the varnish.
Varnish supply means for supplying the varnish to the varnish bath section at a supply amount according to the consumption amount of the varnish, a level meter for detecting a liquid level of the varnish contained in the varnish bath section, and the level meter. Control means for controlling the varnish supply means in accordance with the detection signal from and appropriately changing the supply amount of the varnish to maintain a constant liquid level of the varnish housed inside the varnish bath section. A varnish coating device comprising: