JP2663333B2 - Rubber coated electric wire manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a rubber-coated electric wire.

[0002]

2. Description of the Related Art Conventional methods for producing rubber-coated electric wires are roughly classified into two. One is a batch type shown in FIG. 2, in which a core wire 2 for an electric wire coming out of a bobbin 1 is extruded and covered with rubber by a rubber extruder 3, cooled in a cooling water tank 5, taken up by a take-up machine 9, and taken up by a take-up machine. The reel 10 is wound on a reel 10 at 11, and the reel 10 is put into a steam pot 14 together with the reel, and a vulcanization reaction is carried out at a required temperature for a required time. In another manufacturing method, vulcanization is performed continuously on a running line, and as shown in FIG. 3, a rubber extruder 3 extrudes rubber and coats a core wire 2 coated with a series of flexible vulcanizing tubes. Through a vulcanizing line H, followed by a cooling line C, and then through a seal box 15 to a winding device.

[0003]

The vulcanization method using the steam pot 14 shown in FIG. 2 takes up and winds up the unvulcanized rubber whose rubber coating is still soft, so that the surface is damaged or crushed. There were inconveniences such as a change in cross section. The two-core combed wire and the like are particularly liable to be deformed in cross section, and have a disadvantage that the production cost is increased. In the continuous vulcanization method shown in FIG. 3, there are a case where the heat source is steam and a case where the heat source is a heat medium liquid. In the case of steam, measures must be taken to keep the vapor pressure in the vulcanization line H constant, and since the rubber coating is extremely softened during the reaction, the entire vulcanization line is drawn in a catenary curve, and the coating surface is vulcanized. Do not touch the tube
There were difficult points such as controlling the take-up speed of the core wire. When a vulcanizing medium is used instead of steam heating, both ends of the vulcanizing line H may be higher than the medium liquid level as shown in FIG. The trouble of collecting media mixed in water was added.

The inventor of the present invention has considered that the greatest problem in the production of the conventional rubber-coated electric wire is to develop a new technique of vulcanizing the unvulcanized soft rubber coating while maintaining the correct dimensions without damaging the rubber coating. Then, as a means of protecting the wire rubber coating, the idea was made that a known technique of coating a resin on unvulcanized rubber could be applied when manufacturing a rubber hose for the same purpose. did. For comparison, the method of manufacturing a rubber hose is briefly described as follows. A hose is made by coating rubber on a resin or rubber core material, and a protective resin is coated on it. Is cooled and solidified, passed through a vulcanizer to vulcanize the internal rubber hose, and then the resin coating is peeled off.

[0005]

The rubber-coated electric wire manufacturing apparatus according to the present invention provides a rubber-coated electric wire by extruding and coating rubber on a core wire, and heat-resistant resin having a melting point of 200 ° C. or more for surface protection thereon. A series of rubber-coated electric wire manufacturing lines for extruding and coating, cooling and solidifying the rubber coating, vulcanizing the rubber coating, and peeling and removing the resin coating. Sulfur temperature 160 ° C ~ 200
Having a core wire preheating device that raises the temperature to ℃ and feeds the core wire with an extruder that rubber-extrudes the rubber that has just heated to the above vulcanization temperature.
The equipment of the vulcanization line is characterized in that it is a heat retaining equipment that maintains the vulcanization temperature for a required time without cooling the coated rubber that passes through.

[0006]

The rubber coated electric wire, like the rubber hose, is coated with a resin in order to prevent bubbles and scratches on the rubber surface at the time of manufacture. An obstacle to the idea of the present invention was the dissipation of heat (difficulty in vulcanization) by the electric wire conductor. . The manufacturing apparatus of the present invention preheats and feeds the core wire before rubber coating to the vulcanization temperature of rubber. The unvulcanized rubber to be coated thereon is also heated to the vulcanization temperature immediately before coating. The combination of the rubber extruder and the shear heating device developed earlier by the applicant of the present invention applies the shear heating / extrusion molding device disclosed in Japanese Patent No. 1451701 which rapidly raises the temperature immediately before coating the rubber. If the coated rubber is raised to the vulcanization temperature by another method, the vulcanization proceeds before the rubber is extruded and coated. According to the heat generated by shearing, extrusion coating is performed immediately, so that there is no problem if the vulcanization reaction is started immediately after coating.

[0007] Since the core wire and the rubber coating are sufficiently coated to reach the vulcanization temperature, the rubber coating does not lose much heat even if the high-temperature resin coating having poor heat conductivity is cooled and solidified, and the preheating is not performed. The vulcanization reaction is continued while receiving the heat sent from the device via the core wire. At the above-mentioned vulcanization temperature, the vulcanization line is kept warm and the required vulcanization time is passed. Then, the resin coating is peeled off.

[0008]

FIG. 1 shows an embodiment of the present invention. 1 is a core wire feeding device for electric wires, 2 is a core wire, 3 is a rubber extruder, 4 is a resin extruder, 5 is a cooling water tank, 6 is a caterpillar type take-up machine,
7 is a vulcanization line, 8 is a resin peeling device, 9 is a take-off machine, 10
Is a winding drum, 11 is a winding machine, 12 is a core wire preheating device, 1
Numeral 3 is a shear heating device provided between the extruder 3 main body and the extrusion coating head. FIG. 4 shows an example of an electric wire E to be manufactured. A core wire 2 surrounded by a rubber coating G is obtained by combining seven conductive wires (copper wires) C with a twisted tape T to form a wire. The rubber extruder 3 is a known one, and the same applies to the resin extruder 4. The cooling equipment (water tank) 5 and the caterpillar type drawer 6 are not different from conventional ones. A place where the outer periphery of the core wire coated with rubber and resin is solidified by the water tank is sandwiched between tracks and towed.

The preheating device 12 is a facility for heating the core wire 2 to a rubber vulcanization temperature, for example, 200 ° C., and for feeding it out, such as electric heating and induction heating. The shear heating device 13 is a known heating tube of Japanese Patent No. 1451701 developed by the present applicant. Although not described in detail, the gap between the inner wall of the heating tube and the cylindrical heating surface rotating inside the heating tube is 5 to 25 mm. Length is 1 to inner wall diameter
By making it 2.5 times, it is possible for the first time to generate heat and extrude the shear of rubber. By adjusting the rotation speed, skilled workers can control the temperature of extruded rubber almost freely. . Therefore, the core wire 2 preheated to the vulcanization temperature
Then, the rubber at the vulcanization temperature from the shear heat extruder 13 can be coated. Then, the resin is immediately coated with a resin extruder 4 and then put into a cooling facility 5 where the resin is cooled and solidified, thereby tightening the rubber coating G to provide a protective function.

The heat-resistant resin also has a melting point higher than that of rubber at 200 ° C. or higher. However, after solidification, the resin coating cooled to strength is cooled to 80 ° C. to 150 ° C. Therefore, of the rubber coating G and the core wire 2 which have been heated to the rubber vulcanization temperature of 160 ° to 200 ° C. therein, the rubber coating G is heated by the resin coating and then cooled somewhat through the resin. However, since heat is supplied from the inner core wire 2 connected to the preheating device 12 and the heat-resistant resin has poor heat conductivity, the temperature does not drop much. In this state, the mixture enters the vulcanization line 7, but does not require heating as in the conventional vulcanization equipment. 80 resin coating
Even if the temperature is lowered to ゜ to 150 ° C., the vulcanization reaction is not hindered since the rubber coating G inside is at the same or slightly lower vulcanization temperature. The vulcanization line does not need to heat the rubber coating, but heat is applied to the line equipment as necessary to prevent cooling, and the rubber coating is kept at the vulcanization temperature during the vulcanization line, that is, during the vulcanization time I do. Upon completion of vulcanization, the rubber coating has the required elasticity, is exposed by the next resin peeling device 8, and is wound on the drum 10 by the winding device 11. As described above, the present invention has been described with respect to one embodiment. However, the embodiment can be variously changed and applied according to design conditions within the scope of the invention.

[0011]

The present invention is based on the idea of introducing a resin coating method for surface protection in the production of rubber hoses as a drastic improvement of the conventional method for producing rubber-coated electric wires. By changing the cooling action to the warming and heating action, the surface protection was successfully realized. The manufacturing apparatus of the present invention uses a shear heating extruder developed earlier by the present applicant to extrude and coat rubber at the vulcanization temperature on a core wire preheated to the vulcanization temperature, and quickly coat the core with a resin. When it enters the vulcanization line, the vulcanization reaction of the rubber coating has already progressed inside. Therefore, the vulcanization line has been simplified to a warming facility that allows the rubber coating to pass through without being cooled, instead of a conventional heating facility. The new method of solving the difficulties of heating the rubber coating from outside, which was an obstacle to the adoption of protective resin coating, is solved by extruding and coating with rubber at the vulcanization temperature, and further heating the rubber internally with the core wire and its preheating device. Was.

[Brief description of the drawings]

FIG. 1 is an explanatory view of one embodiment of the present invention.

FIG. 2 is an explanatory view of a conventional technique.

FIG. 3 is an explanatory view of another related art.

FIG. 4 is a sectional view of an electric wire.

[Explanation of symbols]

 Reference Signs List 4 resin extruder 5 cooling equipment 6 take-off machine 7 vulcanization line 8 peeling device 9 take-off machine 12 core wire preheating device 13 shear heating machine

Claims (1)

(57) [Claims] 1. A rubber-coated electric wire obtained by extruding a rubber on a core wire, extruding and coating a heat-resistant resin having a melting point of 200 ° C. or more for surface protection, and cooling and solidifying the resin before the rubber coating. A series of rubber-coated electric wire production lines for peeling and removing the resin coating after vulcanization treatment, wherein the core wire before rubber coating is heated to a rubber vulcanization temperature of 160 ° C. to 200 ° C. and pre-heated. It has a device, the extruder that coats the core wire with rubber is a rubber exothermic extruder that extrudes rubber that has just been heated to the above vulcanization temperature, and the vulcanization line equipment cools the coated rubber that passes. An apparatus for manufacturing a rubber-coated electric wire, characterized in that the apparatus is a heat insulation facility for maintaining the vulcanization temperature for a required time without any need.