KR20160091669A - Heat conduction type crosslinking apparatus for making a cable - Google Patents

Abstract

The present invention relates to a conductive crosslinking apparatus for the production of cables. More specifically, the present invention relates to a method for producing a cable, which comprises heating an insulation layer, a semiconductive layer, a sheath layer and the like by thermal conduction in a state where the insulation layer or the like is in contact with the inner wall of the cross- The present invention relates to a conductive crosslinking apparatus which is excellent in appearance such as an insulating layer to be formed, has a narrow installation space of the apparatus, and can reduce the maintenance cost.

Description

TECHNICAL FIELD [0001] The present invention relates to a conductive crosslinking apparatus for making a cable,

The present invention relates to a conductive crosslinking apparatus for the production of cables. More specifically, the present invention relates to a method for producing a cable, which comprises heating an insulation layer, a semiconductive layer, a sheath layer and the like by thermal conduction in a state where the insulation layer or the like is in contact with the inner wall of the cross- The present invention relates to a conductive crosslinking apparatus which is excellent in appearance such as an insulating layer to be formed, has a small installation space, and can be reduced in maintenance cost.

Generally, the cable is composed of a metal wire, which is a conductor having good electrical conductivity such as copper and aluminum, and an insulating layer surrounding the wire, and further includes a semiconductive layer between the wire and the insulating layer, The entire layer and the sheath layer may be sequentially laminated. Here, the insulating layer, semiconductive layer, sheath layer and the like are generally formed from a material mainly composed of a polymer.

The polymer material forming the insulating layer and the like is covered with the extruder by the use of an extruder, and then crosslinked to improve chemical, electrical and mechanical properties. For example, the polymer before crosslinking can withstand a temperature of about 60 캜, but when crosslinked, it can withstand a temperature of about 90 캜.

The crosslinking step may be carried out by a chemical crosslinking method of crosslinking a polymer constituting the insulating layer or the like by passing an extrusion coated cable through a vulcanization tube having an insulating layer to which a crosslinking agent such as an organic peroxide is added, The crosslinked polymer is crosslinked by crosslinking the polymer constituting the insulating layer or the like, accelerating the thermoelectrons emitted from the filament, irradiating the insulation layer or the like onto the extrusion-coated cable And irradiation bridging for bridging the polymer constituting the insulating layer or the like is used.

Also, when a cable having an insulating layer made of a polymer is transported through the inside of the vulcanizing tube for crosslinking, the insulating layer or the like is transported while being spaced apart from the inner wall of the vulcanizing tube by a constant distance, There is a contact type crosslinking apparatus in which a crosslinking reaction of an insulating layer or the like is carried out while a crosslinking reaction of the insulating layer or the like is performed by a heating method by conduction while the insulating layer or the like is transferred in contact with the inner wall of the vulcanizing tube There is a contact type crosslinking device or a conductive crosslinking device.

Since the insulating layer or the like must be spaced apart from the inner wall of the cirrus tube by a certain distance, the tension of the cable and the arrangement of the cirrus tube to be conveyed through the inner wall of the cirrus pipe must be precisely designed, Etc. may be uneven, and there is a problem that the construction is complicated and the construction cost is large.

On the other hand, since the insulating layer or the like is transferred in contact with the inner wall of the vulcanizing tube, the contact type crosslinking apparatus or the conductive crosslinking apparatus can form a relatively uniform and uniform insulating layer, However, due to repeated thermal expansion and contraction due to heating, uneven length variation is caused in the vulcanized tube, which may cause defective appearance of the insulating layer or the like which is conveyed in contact with the inner wall of the vulcanized tube, There is a problem in that maintenance and repair cost of the crosslinking apparatus is increased because the vulcanizing tube and the cooling tube continuously connected to the vulcanizing tube are partially broken in accordance with the nonuniform length change of the vulcanizing tube.

The conventional conductive bridge device adopts a linear guide capable of moving in the forward and backward directions while supporting the lower portion of the vulcanization tube as means for compensating for the uneven length variation of the vulcanization tube described above, Not only the installation space is increased but also the problem of defective appearance of the insulating layer and the maintenance cost of the crosslinking apparatus can not be sufficiently solved.

Accordingly, there is a desire for a new conductive crosslinking apparatus which is excellent in appearance such as an insulating layer formed in the manufacture of cables, has a small installation space, and can reduce maintenance costs.

An object of the present invention is to provide a conductive crosslinking apparatus having excellent appearance such as an insulating layer of a cable manufactured as a conductive crosslinking apparatus for manufacturing a cable.

It is another object of the present invention to provide a conductive crosslinking apparatus having a narrow installation space.

Furthermore, it is an object of the present invention to provide a conductive crosslinking apparatus which can reduce the maintenance cost.

In order to solve the above problems,

An extruder for extruding and coating one or more polymer layers on a conductor; A vulcanization tube for performing a crosslinking reaction of the extrusion-coated polymer layer; A cooling tube for cooling the crosslinked polymer layer; And at least one flexible connecting portion having a flexible shape and a variable length at a connection portion of the vulcanizing pipe and the cooling pipe or an intermediate portion of the cooling pipe, wherein the total length of the at least one flexible connecting portion is a to b cm, The length x mm of the vulcanization tube satisfies the following formula (1).

[Equation 1]

a mm ≤ kTX ≤ b mm

In the above equation (1)

k is the coefficient of thermal expansion (mm / mm 占 폚) of the vulcanization tube,

And T is the temperature (° C) of the vulcanization tube when performing the crosslinking process.

Wherein k is from 10.1 x 10 ^-6 to 16.9 x 1 ^-6 mm / mm · ° C, T is from 200 to 450 ° C, and the total length of the one or more flexible connections is from 18 to 28 cm. Thereby providing a conductive crosslinking apparatus.

Further, the variable connection portion includes two fastening portions, each of which is fastened and coupled to one end of the vulcanizing tube and the cooling pipe, a variable portion having a variable bending shape and length between the two fastening portions, And a protective layer disposed on the outside of the substrate.

The conductive bridging apparatus is also characterized in that the fastening portion includes a flange, the variable portion includes bellows, and the protective layer includes a metallic braiding structure.

The present invention also provides a conductive crosslinking apparatus characterized in that the flexible connecting portion is made of austenitic stainless steel.

Also, the crosslinking reaction is a chemical crosslinking reaction or a water crosslinking reaction.

Further, a tension is applied to the conductor so that a conductor, which is disposed at one end of each of the vulcanizing tube and the cooling tube, is fed through the inside of the vulcanizing tube so as to be coincident with the center axis of the vulcanizing tube and the cooling tube A metering device and a drawing device are further provided.

Meanwhile, a conductor position sensor for sensing a position of a conductor conveyed through the inside of the vulcanized tube, and a conductor position control unit for controlling the position of the conductor by adjusting a tension applied to the conductor by the metering device and the drawing device, And a conductive crosslinking agent.

A first bobbin for winding the conductor and releasing the wound conductor to supply the conductor; A first accumulator for controlling a speed at which the conductor is unwound from the first bobbin; A second bobbin capable of winding the cable, which is a conductor having a polymer layer crosslinked by the conductive crosslinking apparatus, for storing the cable; And a second accumulator capable of controlling the speed of winding the cable to the second bobbin.

The polymer layer includes an insulating layer, a semiconductive layer, a sheath layer, or both.

The present invention provides a conductive crosslinking apparatus, wherein the polymer layer comprises a polyolefin.

On the other hand, the vulcanization tube is a steel, ferritic stainless steel or austenitic stainless steel having a thermal expansion coefficient of 10.1 × 10 ^-6 to 16.9 × 10 ^-6 mm / mm ° C., and the temperature of the vulcanization tube during the crosslinking reaction is Lt; RTI ID = 0.0 > 200 C < / RTI > to < RTI ID = 0.0 > 450 C. < / RTI >

The conductive bridging apparatus for manufacturing a cable according to the present invention has excellent appearance such as an insulating layer of a cable manufactured by a new connecting means capable of compensating for uneven length variation due to thermal expansion and contraction of a vulcanizing tube constituting the cable Effect.

Further, since the conductive bridge device for manufacturing the cable according to the present invention does not need to separately provide a means for compensating for the change in the length of the vulcanizer tube outside the vulcanizer pipe as in the case of the conventional conducting bridge device, Effect.

Further, the conductive bridge device for manufacturing the cable according to the present invention is characterized in that the connection pipe is continuously connected to the vulcanization pipe according to the length change by a new connecting means capable of compensating for a change in length due to thermal expansion and contraction of the vulcanization pipe It is possible to avoid the partial breakage of the cooling pipe and the like, and the maintenance cost is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 schematically depicts a conductive crosslinking apparatus for the manufacture of a cable according to the invention.
Fig. 2 is an enlarged view of a portion A showing the variable connection portion in Fig.
Figure 3 shows one embodiment of a flexible connection in a conductive bridging apparatus for the manufacture of a cable according to the invention.

Hereinafter, preferred embodiments of the present invention will be described in detail. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 schematically depicts a conductive crosslinking apparatus for the manufacture of a cable according to the invention.

As shown in FIG. 2, the conductive crosslinking apparatus according to the present invention is a conductive crosslinking apparatus in which a polymer layer such as an insulating layer, a semiconductive layer, and a sheath layer is extruded and coated on a conductor, these are crosslinked, Is a device capable of continuously performing a series of steps to be taken.

Specifically, a conductive crosslinking apparatus according to the present invention includes a first bobbin 100 having a conductor layer to be coated with a polymer layer such as an insulating layer, An extruder 400 for extruding and coating a polymer layer such as an insulating layer on a conductor, and a vulcanizing tube (not shown) for bridging the polymer layer such as an extrusion-coated insulating layer, etc. The first accumulator 200 and the metering device 300, A cooling tube 700 for cooling a polymer layer such as an insulating layer crosslinked in the vulcanization tube 500 and a flexible tube 700 disposed at a connection portion between the vulcanization tube 500 and the cooling tube 700, And a second accumulator 900 for feeding the fabricated cable to the second bobbin 1000 to be described later at a controlled speed and a second bobbin 100).

Also, in the conductive crosslinking apparatus according to the present invention, a conductor in which a polymer layer such as an insulating layer is extruded and coated is transferred, and a cocoon tube 500 in which a crosslinking reaction of the polymer layer such as the insulating layer proceeds is disposed horizontally The insulating layer and the like are transferred while being in contact with the inner wall of the vulcanizing tube 500, and the crosslinking reaction is performed by heat transmitted from the vulcanizing tube 500 by heat conduction. Here, the conductor conveyed through the inside of the vortex tube 500 should always be disposed at the center of the insulation layer so that the thickness of the insulation layer coated thereon is uniform. To this end, the metering device 300, Apparatus 800 imparts controlled tension to the conductor.

The conductive crosslinking apparatus according to the present invention can prevent the insulating layer from being lost or unevenly formed due to gravity because the insulating layer or the like is crosslinked while being transferred while being in contact with the inner wall of the vulcanization tube 500 At the same time, it is easy to adjust the tension applied to the conductor even though the vortex tube 500 is arranged horizontally with the ground, and the construction is simple.

The conductive bridging apparatus according to the present invention may further include one or more conductor position sensors and conductor position controls in the vortex tube 500 and / or the cooling tube 700, The position of the conductor conveyed through the pipe 500 or the inside of the cooling pipe 700 is sensed and the conductor position control unit controls the position of the conductor from the metering device 300 and the drawing device 400 By controlling the tension applied to the conductor, the conductor can be transferred in conformity with the center axis of the vortex tube 500 or the cooling tube 600, thereby ensuring a uniform thickness of the insulating layer or the like.

In addition, the first accumulator 200 and the second accumulator 900 may include a plurality of wheels capable of hanging conductors or cables and capable of adjusting the movement of the shafts, and moving the axes of the plurality of wheels, The speed at which the conductor is unwound from the first bobbin 100 and the speed at which the cable is wound around the second bobbin 1000 can be controlled.

In the conductive crosslinking apparatus according to the present invention, the extruder 400 performs a function of extruding and coating a polymer layer such as an insulating layer, a semiconductive layer, and a sheath layer on the surface of a conductor provided. The conductor provided to the extruder 400 may be a single stranded metal wire such as copper, aluminum or the like, or may be a strand-shaped conductor in which a plurality of metal wires are twisted. The polymer layer such as an insulating layer extruded and coated on the conductor may be formed from a composition containing polyolefin as the main material, for example, polyethylene, polypropylene, and the like. The insulating layer, semiconductive layer, sheath layer, Or at the same time extrusion coated.

A crosslinking reaction of a polymer layer such as an insulating layer is performed inside the vulcanization tube 500. The crosslinking reaction may be a chemical crosslinking performed at a high temperature or a crosslinking reaction by water crosslinking. The vulcanizing tube 500 is heated to perform chemical crosslinking or water crosslinking at a high temperature of the insulating layer or the like, and the conductive crosslinking apparatus according to the present invention additionally includes means for heating the vulcanizing tube 500 As shown in FIG.

The vortex tube 500 may be made of steel, ferritic stainless steel, austenitic stainless steel or the like, and the coefficient of thermal expansion of the material constituting the vortex tube 500 may be, for example, 10.1 × 10 ^-6 Lt; ^-6 > mm / mm < ⁰ > C. In addition, the temperature of the vulcanization tube 500 according to the crosslinking process performed in the vulcanization tube 500 may be about 200 to 450 ° C, preferably 250 ° C.

Inside the cooling pipe 700, the polymer layer such as an insulating layer, which has undergone the crosslinking reaction in the vulcanization tube 500, is cooled to form a polymer layer such as a final insulating layer. The cooling method performed in the cooling pipe 700 is not particularly limited, and for example, cooling with cooling water may be performed. In this case, means for supplying the cooling water and adjusting the water level may be further included. Meanwhile, the cooling pipe 700 may be made of the same or different material as the vulcanization pipe 500.

The conductive crosslinking apparatus according to the present invention may include at least one flexible connection portion at a portion where the vulcanizing tube 500 and the cooling tube 700 are connected to each other or in the middle of the cooling tube 700.

Fig. 2 is an enlarged view of a portion A showing the variable connection portion in Fig. As shown in FIGS. 1 and 2, the variable connection portion 600 can be flexibly bent and the length thereof can be changed. Thus, when the length of the vulcanization tube 500 is changed due to uneven thermal expansion and contraction of the vulcanization tube 500 or when the center axis of the vulcanization tube 500 and the cooling tube 700 are inconsistent It is possible to compensate for such changes and inconsistencies so that it is possible to avoid the appearance defects of the insulating layer and the like and the maintenance cost increase due to the partial breakage of the vulcanizing tube 500 and the cooling tube 700 .

The material of the flexible connecting part 600 is not particularly limited, but it is preferably a material having excellent strength capable of withstanding an internal pressure of about 15 bar, exhibiting acid resistance, excellent resistance to organic peroxides used as a crosslinking agent in chemical crosslinking, For example, an austenitic stainless steel.

Figure 3 shows one embodiment of a flexible connection in a conductive bridging apparatus for the manufacture of a cable according to the invention. 3, the flexible connection part 600 can be fastened and coupled to one end of the vulcanizing tube 500 and / or the cooling tube 700 by a bolt or the like, A variable portion 620 such as a bellows having a variable bending shape and a length between the two coupling portions 610, and a flexible portion 620 such as a bellows having a variable length between the two coupling portions 610, And a protective layer 630 disposed outside the variable portion 620 to protect the variable portion 620 from an external impact or the like. Here, the protective layer 630 may be formed of, for example, a metal braiding structure.

If the length of the variable connection portion 600 is excessively short or the number of the variable connection portions 600 is excessively small, a change in length due to thermal expansion due to the high temperature of the vulcanization tube 500 can not be sufficiently compensated, The maintenance cost of the crosslinking apparatus is increased due to the thermal expansion of the flexible connecting member 600. On the other hand, if the length of the flexible connecting unit 600 is excessively long or the number of the flexible connecting units 600 is excessively large, 500 and the cooling pipe 700 may be significantly reduced to cause a partial sagging phenomenon of the vulcanization pipe 500 and the cooling pipe 700. This may cause an appearance failure of the insulation layer or the like .

Therefore, when the total length of the at least one flexible connecting part 600 is a to b cm, the length X mm of the vulcanizing tube may satisfy the following equation (1). For example, the total length of the one or more flexible connections 600 may be 18 to 28 cm.

[Equation 1]

a mm ≤ kTX ≤ b mm

In the above equation (1)

k is the coefficient of thermal expansion (mm / mm 占 폚) of the vulcanization tube,

And T is the temperature (° C) of the vulcanization tube when performing the crosslinking process.

Here, k may be 10.1 × 10 ^-6 to 16.9 × 1 ^-6 mm / mm ° C., and T may be 200 to 450 ° C.

When the length of the variable connection portion 600 and the length of the vulcanization tube 500 satisfy the above Equation 1, The change in length can be properly compensated.

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. . It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.

100: first bobbin 200: first accumulator
300: metering device 400: extruder
500: Vortex tube 600: Variable connection
700: Cooling tube 800: Drawing device
900: 2nd accumulator 1000: 2nd bobbin

Claims (12)

An extruder for extruding and coating one or more polymer layers on a conductor;
A vulcanization tube for performing a crosslinking reaction of the extrusion-coated polymer layer;
A cooling tube for cooling the crosslinked polymer layer; And
And at least one flexible connecting portion having a bent shape and a variable length at a connecting portion of the vulcanizing tube and the cooling tube or an intermediate portion of the cooling tube,
Wherein the total length of the at least one flexible interconnect is a to b cm,
And the length x mm of the vulcanization tube satisfies the following formula (1).
[Equation 1]
a mm ≤ kTX ≤ b mm
In the above equation (1)
k is the coefficient of thermal expansion (mm / mm 占 폚) of the vulcanization tube,
And T is the temperature (° C) of the vulcanization tube when performing the crosslinking process. The method according to claim 1,
k is 10.1 × 10 ^-6 to 16.9 × 1 ^-6 mm / mm · ° C.,
T is 200 to 450 캜,
Wherein the total length of the at least one flexible interconnect is in the range of 18 to 28 cm. 3. The method according to claim 1 or 2,
Wherein the flexible connecting portion includes two fastening portions which are respectively fastened and coupled to one end of the vulcanizing tube and the cooling pipe, a variable portion having a variable bending shape and length between the two fastening portions, And a protective layer disposed on the conductive layer. The method of claim 3,
Wherein the fastening portion includes a flange, the variable portion includes bellows, and the protective layer comprises a metallic braided structure. 3. The method according to claim 1 or 2,
Wherein the flexible connecting portion is made of austenitic stainless steel. 3. The method according to claim 1 or 2,
Wherein the crosslinking reaction is a chemical crosslinking reaction or a water crosslinking reaction. 3. The method according to claim 1 or 2,
And a metering device which is disposed at one end of each of the vulcanizing tube and the cooling tube and which gives a regulated tension to the conductor so that a conductor conveyed through the inside of the vulcanizing tube is conveyed so as to coincide with the vulcanizing tube and the center axis of the cooling tube, And a drawing device. ≪ Desc / Clms Page number 19 > 8. The method of claim 7,
A conductor position sensor for sensing a position of a conductor conveyed through the inside of the vulcanization tube, and a conductor position control unit for controlling a position of the conductor by adjusting a tension applied to the conductor by the metering device and the drawing device Wherein the conductive cross-linking agent is a crosslinking agent. 3. The method according to claim 1 or 2,
A first bobbin for winding the conductor and releasing the wound conductor to supply the conductor;
A first accumulator for controlling a speed at which the conductor is unwound from the first bobbin;
A second bobbin capable of winding the cable, which is a conductor having a polymer layer crosslinked by the conductive crosslinking apparatus, for storing the cable; And
Further comprising a second accumulator capable of controlling the speed of winding the cable to the second bobbin. 3. The method according to claim 1 or 2,
Wherein the polymer layer comprises an insulating layer, a semiconductive layer, a sheath layer, or both. 11. The method of claim 10,
Wherein the polymer layer comprises a polyolefin. 3. The method according to claim 1 or 2,
The vulcanization tube is steel, ferritic stainless steel or austenitic stainless steel, and a conductive crosslinking apparatus.

Images