JPH0639850A - Cooling apparatus - Google Patents

Abstract

PURPOSE:To stably keep the level of the cooling medium in a cooling pipe and to prevent the evaporation of the cooling medium in the vicinity of the surface thereof by a method wherein the cooling medium is supplied to the cooling pipe cooling a rubber coated cable after vulcanization to be allowed to always overflow from a predetermined cooling medium level position to be stored in a level detection pot and discharged from the pot at a constant speed to hold a definite amount of the cooling medium in the pot. CONSTITUTION:A vulcanizing pipe 4 and a cooling pipe 5 are directly connected and a cable core 1 is drawn into the vulcanizing pipe 4 through a spline box 8 and drawn out through a cooling pipe 5 and a water seal 8. An escape pipe 25 is provided to the part of the surface 7a of the cooling water 7 of the cooling pipe 5 to allow the cooling water 7 to overflow. A level detection pot 26 is connected to the pipe 25 and the cooling water is discharged from the escape valve 27 provided to the lower part of the pot 26 by a definite amount. In a supply water control part 30, the liquid level position in the pot 26 is detected by a differential pressure detector 31 and compared with a referece position to output a predetermined signal. A level controller 32 controls a water supply control valve 33 on the basis of the signal to increase and decrease the amount of the water supplied to the cooling pipe 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device used for cooling a resin of a cable after vulcanizing a rubber or plastic coating of the cable.

[0002]

2. Description of the Related Art Conventionally, a catenary type production line has been adopted to extrude and coat a rubber sheath or the like on the outer periphery of a cable core and continuously vulcanize it. In Figure 2,
A schematic view of such a conventional cable manufacturing line is shown. As shown in the figure, the cable core 1 is supplied from the supply drum 2 and the sheath is covered by the extruder 3. This cable is then drawn into the vulcanization tube 4 and heated to be vulcanized. Then, it is drawn into the cooling pipe 5 and cooled by water or the like. The cooled cable core 1 is wound on a winding drum 6.

FIG. 3 shows a cross-sectional view of a main part centering on the cooling pipe 5 as described above and a block diagram of a supply control part for controlling the level of cooling water. In the figure, the vulcanization pipe 4 is a cooling pipe 5.
The cooling pipe 5 contains cooling water 7 for cooling the resin coated on the cable core 1. The cable core 1 is drawn from above the vulcanization pipe 4 through the splice box 8 into the vulcanization pipe 4 and vulcanized. After that, the cable core 1 is drawn into the cooling water 7 of the cooling pipe 5 to be cooled, passes through the water seal 9, and is drawn toward the winding drum 6 described with reference to FIG.

Here, the liquid surface 7A of the cooling water 7 must be always maintained at a constant level in order to stabilize the characteristics of the product. For this purpose, the supply controller 10 as shown in the figure is provided. The supply control unit 10 includes a differential pressure detector 11, a water level controller 12, a water supply control valve 13
Also, a water supply pump 14 is provided. Differential pressure detector 11
Is connected to the vulcanizing pipe 4 via a gas pressure measuring pipe 15, and is connected to the cooling pipe 5 via a water pressure measuring pipe 16. The differential pressure detector 11 uses the gas pressure measuring pipe 15 and the water pressure measuring pipe 16 to measure the liquid level 7 of the cooling water 7.
The pressure difference between the upper and lower parts of A is detected. Then, it is detected whether or not this pressure satisfies a certain standard. If a certain standard is satisfied, no output can be obtained from the differential pressure detector 11. For example, when the liquid level 7A is too low and the pressure difference is lower than the standard, the water level controller 12 indicates that. Output a signal.
The water level controller 12 is composed of a drive circuit for controlling the water supply control valve 13. Further, the water supply pump 14 is configured to pump the cooling water 7 from the water tank 20 and supply the cooling water 7 to the cooling pipe 5 via the water supply control valve 13.

Therefore, when the differential pressure detector 11 judges that the liquid level 7A of the cooling water 7 is low and outputs a signal to that effect to the water level controller 12, the water supply control valve 13 is opened to a greater extent than before, and the water supply is stopped. A larger amount of cooling water 7 is supplied to the cooling pipe 5 by the pump 14 to push up the liquid surface 7A. In the opposite case, the water supply control valve 13 is rotated in the closing direction to suppress the supply amount of the cooling water 7. As described above, the liquid level of the cooling water 7 in the cooling pipe 5 is controlled so as to be always kept constant.

[0006]

By the way, as described above, the cooling pipe 5 is directly connected to the vulcanizing pipe 4 whose inside is kept at a high temperature, and is close to the liquid surface 7A of the cooling water 7 of the cooling pipe 5. The part is heated to a high temperature. Therefore, steam is generated in the upper part of the cooling pipe 5 and flows into the vulcanization pipe 4 side. However, the resin coated on the outer periphery of the cable core 1 is vulcanized inside the vulcanization tube 4, and when steam flows into the vulcanization tube 4, the steam is taken into the resin, which deteriorates the electrical characteristics of the resin. There was a problem. Further, the decrease of the cooling water 7 inside the cooling pipe 5 is mainly due to the leakage from the portion of the water seal 9, and in the conventional method, the liquid surface position 7
There is a problem that it is very difficult to keep the variation of A within a certain range. This cannot stabilize the quality.

The present invention has been made by paying attention to the above points. The liquid surface of the cooling medium such as the cooling water contained in the cooling pipe is maintained stable, and the cooling medium near the liquid surface is kept stable. It is an object of the present invention to provide a cooling device that prevents vaporization.

[0008]

A cooling device of the present invention is arranged behind an extruder for extruding a resin, and a cooling medium for cooling the resin extruded by the extruder is held at a predetermined liquid level. A cooling pipe that accommodates and passes the resin, a relief pipe that is arranged at the liquid level position of the cooling pipe and that overflows the cooling medium, and the cooling medium that overflows via the relief pipe is temporarily accumulated. A level detection pot and a relief valve for discharging the cooling medium from the level detection pot at a preset constant speed;
A supply controller for continuously supplying the cooling medium to the cooling pipe is provided so that the amount of the cooling medium in the level detection pot is kept constant.

[0009]

This cooling device is constructed so that the cooling medium always overflows via the relief pipe arranged at the liquid level position of the cooling pipe. Therefore, the liquid level of the cooling medium is made constant by the position of the escape pipe. The cooling medium overflowing via the escape pipe is temporarily accumulated in the level detection pot. If the amount of the cooling medium that overflows and the amount of the cooling medium that is discharged from the relief valve are constant, the liquid level of the cooling medium inside the level detection pot is kept constant. The supply control unit supplies the cooling medium such that the cooling medium always overflows a certain amount on the liquid surface of the cooling pipe. As a result, the temperature of the cooling medium in the vicinity of the liquid surface of the cooling medium is not overheated to an abnormally high temperature.
Further, the liquid level is always kept constant by the action of the escape pipe.

[0010]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a block diagram of a main part longitudinal section and a supply control part 30 showing a cooling device embodiment of the present invention. In the figure, the cable core 1 is configured to be drawn into the vulcanization pipe 4 and the cooling pipe 5 similar to those described above with reference to FIG. The vulcanization pipe 4 and the cooling pipe 5 are directly connected,
The cable core 1 is drawn into the vulcanization pipe 4 via a splice box 8 above the vulcanization pipe 4. The cable core 1 cooled by the cooling water 7 of the cooling pipe 5 is configured to be drawn out through the water seal 9.

Here, in the apparatus of the present invention, the escape pipe 25 is arranged at the liquid level 7A portion of the cooling water 7 of the cooling pipe 5, and the cooling water 7 overflows from this. A level detection pot 26 is connected to the escape pipe 25. In addition, the level detection pot 26
A relief valve 27 is connected to the lower part of the. That is, the cooling water 7 that has overflowed is temporarily stored in the level detection pot 26, and the cooling water is discharged from the relief valve 27 by a fixed amount to the outside.

On the other hand, this apparatus is provided with a supply controller 30 for controlling the overflow of the cooling water.
The supply control unit 30 is provided with a differential pressure detector 31, a water level controller 32, a water supply adjusting valve 33, and a water supply pump 34. The differential pressure detection unit 31 is connected to the level detection pot 26 via a gas pressure measurement pipe 35 and a water pressure measurement pipe 36. The gas pressure measurement pipe 35 is opened above the liquid surface 26A of the cooling water 7 accumulated in the level detection pot 26. The water pressure measuring pipe 16 is connected to the inside of the level detecting pot 26 so as to open at a portion below the liquid surface 26A of the cooling water 7. Differential pressure detector 3
1 detects the liquid level position of the cooling water 7 inside the level detection pot 26 using the pipes 35 and 36 as described above.

The differential pressure detector 31 includes a water level controller 3 when the liquid surface position is higher or lower than the reference position.
2 is configured to output a predetermined control signal.
Water level controller 32, water supply control valve 33, and water supply pump 34
Has a configuration similar to that of the conventional device described above with reference to FIG. That is, the water supply pump 34 is configured to pump the cooling water 7 from the water tank 20 and supply the cooling water 7 to the cooling pipe 5 via the water supply control valve 33. In addition, the water level controller 32 is configured to adjust the opening of the water supply control valve 33 and increase or decrease the amount of the cooling water 7 supplied to the cooling pipe 5.

The cooling device of the present invention having the above construction operates as follows. First, the water supply pump 34 first pumps the cooling water 7 from the water tank 20, the water supply control valve 33 is set to the reference opening degree, and a certain amount of the cooling water 7 is supplied to the cooling pipe 5.
In this way, when the cooling water 7 is continuously supplied to the cooling pipe 5, the liquid level 7A thereof gradually rises. Then, the cooling water 7 overflows at the position of the escape pipe 25, and the cooling water 7
The liquid surface 7A is always held at the position where the escape pipe 25 opens. Here, the overflowed cooling water 7 is accumulated in the level detection pot 26 through the escape pipe 25.
At this time, if the relief valve 27 is adjusted to discharge the cooling water to the outside by the amount of the cooling water overflowing,
The liquid level of the level detection pot 26 does not change. That is, the liquid surface is always kept at a constant reference position, and the differential pressure detector 31 does not output any control signal.

On the other hand, for example, when the amount of the cooling water 7 overflowing from the cooling pipe 5 increases, the liquid level 26A of the cooling water accumulated in the level detecting pot 26 rises. The differential pressure detector 31 detects this and sends a signal to that effect to the water level controller 32. According to the instruction, the water level controller 32 throttles the water supply control valve 33 to reduce the supply amount of the cooling water 7 supplied by the water supply pump 34. As a result, the amount of cooling water that overflows from the cooling pipe 5 decreases, the amount of cooling water in the level detection pot 26 decreases, and the liquid surface 26A of the cooling water returns to the reference position.

On the contrary, when the amount of the cooling water accumulated in the level detection pot 26 decreases, the opposite of the previous operation,
The water level controller 32 opens the water supply control valve 33 and controls so that more cooling water 7 is supplied to the cooling pipe 5. As a result, the overflow amount of the cooling water increases, and the liquid level 26A of the cooling water accumulated in the level detection pot 26 rises.
By repeating the above control, the cooling water can be constantly circulated through the cooling pipe 5 at a constant rate.

In the case of the control as described above, the liquid level 26A of the cooling water inside the level detection pot 26 fluctuates up and down, but the liquid level 7A of the cooling water 7 inside the cooling pipe 5 is always the escape pipe 25. It is held at the position of the opening of and does not change. Therefore, the cooling condition of the cable can be kept extremely stable. Further, if the cooling water 7 is made to overflow and circulate at a constant rate, the cooling water will not boil near the liquid surface 7A of the cooling water 7 at the upper part of the cooling pipe 5, and the steam will be vulcanized. It can be prevented from flowing into 4. In the above device, the amount of cooling water circulating inside the cooling pipe 5 is controlled by the set amount of the relief valve 27. Therefore, after obtaining appropriate manufacturing conditions in advance, this relief valve 2
It is preferable to determine the set value of 7.

The present invention is not limited to the above embodiments. Although the cooling water 7 is contained in the cooling pipe 5 in the above embodiment, the cooling water 7 may be any cooling medium capable of cooling the resin coated on the outer circumference of the cable. It may be. The resin cooled by such a cooling device can be rubber, plastic, or various other materials. Also, the escape pipe 25
The mounting positions and the number thereof may be freely increased or decreased as necessary, and the level detection pot 26 and the differential pressure detector 31 are capable of accumulating the overflowed cooling water and detecting the flow rate thereof. It may have any configuration as long as it is. Of course, the mechanism for supplying cooling water may be freely changed as necessary.

[0019]

According to the cooling apparatus of the present invention described above, the cooling medium for cooling the resin extruded by the extruder is housed in the cooling pipe, while the escape pipe for overflowing the cooling medium to the liquid surface position of the cooling pipe. The cooling medium that has overflowed is temporarily stored in the level detection pot, and the cooling medium is supplied to the cooling pipe so that the amount of liquid inside is kept constant. It can be maintained accurately and stably depending on the position of the escape pipe. Moreover, since the cooling water is circulated so that the liquid surface is kept constant and overflows, it is possible to prevent the cooling water in the portion near the liquid surface from being overheated to an abnormally high temperature and evaporating.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part and a block diagram of a supply controller 30 showing a cooling device embodiment of the present invention.

FIG. 2 is a schematic view of a conventional cable manufacturing apparatus.

FIG. 3 is a cross-sectional view of a main part of a conventional cooling device and a block diagram of a supply controller 10.

[Explanation of symbols]

 1 Cable Core 4 Vulcanizing Pipe 5 Cooling Pipe 7 Cooling Water (Cooling Medium) 20 Water Tank 25 Escape Pipe 26 Level Detection Pot 27 Escape Valve 30 Supply Control Section

Claims (1)

[Claims] 1. A cooling pipe disposed behind an extruder for extruding a resin, which contains a cooling medium for cooling the resin extruded by the extruder while holding a predetermined liquid level and allowing the resin to pass therethrough. A relief pipe arranged at the liquid surface position of the cooling pipe for overflowing the cooling medium; a level detection pot for temporarily accumulating the cooling medium overflowing via the relief pipe; A relief valve that discharges the cooling medium at a preset constant speed, and a supply that continuously supplies the cooling medium to the cooling pipe so that the liquid amount of the cooling medium in the level detection pot is kept constant. A cooling device comprising: a control unit.