JPH06338231A - Electric wire cooler - Google Patents

Abstract

PURPOSE:To enhance cooling performance without remarkably enlarging a cooler tank of a line by forcibly cooling an extruded resin of an electric wire wound around an accumulator. CONSTITUTION:An electric wire 1 covered by an extruded resin is fed in the direction indicated by an arrow 13, to be thus reciprocated between a pair of turn sheaves 15A, 15B of an accumulator 15. The turn sheave 15B is moved in the direction indicated by an arrow 12 via a tension applying mechanism 15C so as to absorb a difference between a taking speed of the electric wire 1 and a winding speed thereof. Simultaneously, a cooling tray 16 is disposed under the accumulator 15 so that a part of the electric wire 1 wound around the turn sheaves 15A, 15B is soaked in cooling water 17, thus cooling the extruded resin of the electric wire 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire cooling device for cooling electric wires to an appropriate temperature in an electric wire extrusion coating line.

[0002]

2. Description of the Related Art In an electric wire production line, when an insulator or a sheath is extruded and covered, an electric wire cooling device is provided to cool the extruded resin to an appropriate temperature. Figure 2
Fig. 1 shows a schematic view of a conventional extrusion line. As shown in the figure, this line is equipped with an extruder 2 for extruding and covering an electric wire 1 with an insulator or a sheath, a cooling tank 3, a take-up machine 4, an accumulator 5 and a take-up machine 6. In the above apparatus, when the resin is coated on the outside of the electric wire 1 by the extruder 2, the resin is cooled in the cooling tank 3, and the take-up machine 4
The electric wire 1 taken up by is finally wound up by the winder 6.

The accumulator 5 is for absorbing the speed difference between the take-up speed of the take-up machine 4 and the take-up speed of the take-up machine 6. In particular, this accumulator is provided in order to absorb the variation in the winding speed of the electric wire during replacement of the drum when the electric wire 1 is continuously extruded and covered and the drum of the winder 6 becomes full. In the electric wire production line as described above, resin cooling is a very important point. That is, if the cooling is insufficient, there arises a problem that the resin is crushed after winding and the electric wire is broken on the drum, and the final product may be a defective product. Therefore, the cooling tank 3 is selected to have a sufficient length.

However, due to the layout of the factory, the cooling tank 3 may not be sufficiently long. In such a case, the following two-tank cooling tank is used.
FIG. 3 shows a schematic diagram of a conventional two-tank cooling tank. In this line, a two-tank type cooling tank 7 including two turn sheaves 8 and 9 and an ascending / descending cooling tank 10 is arranged between the extruder 2 and the take-up machine 4. In such an apparatus, the electric wire 1 is reversed in the take-up direction at the turn sheaves 8 and 9, and is cooled via the ascending / descending cooling tank 10. Therefore, the length of the cooling tank 7 can be shortened to about 1/2 of that of the line having the configuration shown in FIG.

[0005]

By the way, the above-mentioned conventional electric wire cooling device has the following problems to be solved. In the extrusion line as described above, the length of the one-tank type cooling device is usually about 10 to 20 m. Also, in the case of the two-tank type cooling tank, the cooling length of 15 to 50 m in total is the limit when the manufacturing conditions are taken into consideration. However, if the performance of the extruder, the winder, or the take-up machine is improved to improve the productivity and the wire speed of the electric wire is increased, the cooling effect of the cooling tank may be insufficient as it is. If the cooling is insufficient, only the surface portion of the electric wire is cooled, and after winding, the internal heat is transferred to the surface and the expansion and contraction phenomenon of the resin occurs. Further, in an extreme case, deformation, winding collapse, or the like occurs as described above.

The present invention has been made by paying attention to the above points, and without significantly enlarging the conventional line cooling tank,
An object of the present invention is to provide an electric wire cooling device capable of increasing its cooling capacity.

[0007]

SUMMARY OF THE INVENTION An electric wire cooling device of the present invention comprises a cooling tank for extruding a resin to cool an electric wire covered with resin.
An accumulator arranged between the winder for winding the electric wire and absorbing a speed difference between the take-up speed of the electric wire and the take-up speed of the winder, and cooling the electric wire accumulated in the accumulator. And a cooling means for controlling the temperature.

[0008]

In this device, the conventional cooling tank or the like is used as it is, and in addition to this, the electric wire accumulated in the accumulator is cooled. Therefore, a part of the accumulator is cooled by a cooling tray or the like.

[0009]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a schematic view showing an embodiment of an electric wire cooling device of the present invention, (a) is a plan view thereof, and (b) is a sectional view thereof. In the figure, this device is shown by an arrow 13 from the cooling tank.
The structure of the accumulator portion for accumulating the electric wire 1 wound in the direction of and storing it in the winding machine and sending it out as shown by an arrow 14 is characterized.

The accumulator 15 is composed of a pair of turn sheaves 15A and 15B. In this example, the electric wire 1
Makes five round trips between these turn sheaves 15A and 15B. Further, a tension applying mechanism 15C is provided so as to move the turn sheave 15B on the right side of the drawing in the direction of arrow 12 to absorb the speed fluctuation of the electric wire 1. Since the tension applying mechanism 15C has a well-known configuration, it is not shown here, but is constituted by a spring or the like, and pulls the turn sheave 15B toward the winder to apply a constant tension to the electric wire 1. . The structure of such a turn sheave and a tension applying mechanism is exactly the same as that of the conventional device, and a detailed description thereof will be omitted.

On the other hand, in the apparatus of the present invention, a cooling tray 16 as shown in the figure is provided below the accumulator 15.
Is arranged, and the cooling water 17 is stored therein. The cooling water 17 is set to an appropriate water level so as to cool a part of the electric wire 1 wound around the turn sheaves 15A and 15B together with the turn sheaves 15A and 15B. It is assumed that the cooling water 17 is supplied to the cooling tray 16 via a pipe or the like as shown by an arrow 19, and is further discharged as shown by an arrow 18 to be circulated. Normally, the wire storage dose of such an accumulator in the extrusion line is 30 m.
It will be about 200 m. Therefore, in this example, the electric wire in the accumulator is about 15 m to 100 m in the cooling tray 1.
It will be cooled by the cooling water 17 in 6.

The electric wire cooling device of the present invention having the above-described structure is provided with the cooling tank 3 once in the extrusion line as shown in FIG.
Even if the cooling is slightly insufficient after being cooled by, the accumulator 5 is cooled by a cooling means such as the cooling tray 16 and the cooling water 17 shown in FIG. Sufficient cooling can be performed just before being taken up by the machine.

The present invention is not limited to the above embodiments. In the above-described embodiment, the example in which the horizontal type accumulator that stores the electric wire in the horizontal direction is used is shown, but the same can be applied to the vertical type in which the turn sheave moves up and down. For example, if the turn sheave of the accumulator has a structure in which part of the turn sheave is submerged in the cooling water of the cooling tray, the cooling water is agitated by the turn sheave, and the cooling effect is enhanced. Further, the cooling means is not limited to the one using the water tank, but may be one having a structure in which the cooling air is applied to the electric wire by using, for example, a fan. Even in such a case, since the accumulator is one in which the electric wires are wound at a high density and sent out, the accumulator can be efficiently cooled.

[0014]

The electric wire cooling device of the present invention described above,
Since the extruded resin of the electric wire once cooled in the cooling tank is forcibly cooled in a state of being wound around the accumulator,
The electric wire can be cooled efficiently. Thereby, the cooling effect of the electric wire can be improved, for example, by a factor of 2 to 4 while keeping the entire length of the line as it is.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of an electric wire cooling device of the present invention,
(A) is the top view and (b) is the sectional view.

FIG. 2 is a schematic view of a general electric wire extrusion line.

FIG. 3 is a schematic view of another general electric wire extrusion line.

[Explanation of symbols]

 1 electric wire 15 accumulator 15A, 15B turn sheave 16 cooling tray 17 cooling water

Claims (1)

[Claims] 1. A cooling tank for cooling an electric wire extruded with a resin and a winder for winding the electric wire, the take-up speed of the electric wire and the take-up speed of the winder. An electric wire cooling device, comprising: an accumulator that absorbs the speed difference of the electric wire; and a cooling unit that cools the electric wire accumulated in the accumulator.