JPS605454Y2 - Seal packing for vulcanized pipes - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a seal packing for vulcanized pipes.

More specifically, the present invention relates to a seal gasket provided at the product outlet of a vulcanized tube, which has dramatically improved durability.

Conventionally, a continuous extrusion vulcanization apparatus shown in FIGS. 1 and 2 has been used to manufacture rubber-coated electric wires such as HCVXCCV and VCV.

Figure 1 is a schematic plan view of the continuous extrusion vulcanization equipment, and Figure 2 is the
It is an enlarged cross-sectional view of part A in the figure.

As shown in FIG. 1, in the crosshead part 1, the unvulcanized rubber material supplied from the extruder 3 is continuously coated around the core wire 2 supplied, and the electric wire coated with unvulcanized rubber is After being further vulcanized in the heating section 5 of the vulcanizing tube 4, it is cooled by a cooling liquid (such as cooling water) in the cooling section 6 of the vulcanizing tube 4, and then released from the product take-out lower at the end of the vulcanizing tube 4. , and is taken out as a vulcanized rubber-coated electric wire 8.

As shown in FIG. 2, a hole 10 having an outer diameter approximately equal to that of the covered wire is formed in the product removal lower in the center to seal the coolant in the cooling section 6 and take out only the covered wire 8. A seal packing 9 is provided which includes a bowl-shaped pressure receiving part 11 and a flange part 12 continuous to the periphery of the pressure receiving part.

The seal packing is 12 to 20 kg/kg inside the cooling section 6.
Generally, hard chloroprene rubber is used as the material so that it can withstand the pressure of cwt.

However, the central hole 10 of the seal packing 9 made of hard Roloprene rubber is in constant contact with the insulated wire 8 under high voltage, and furthermore, since the insulated wire is pulled out in this state, wear is severe and the seal packing 9 has to be replaced frequently. There is a drawback that it must be done.

For example, a 60rrd cross-linked polyethylene coated wire for 600V needs to be replaced every 20 to 2 cycles of operation.

The present inventors have conducted intensive studies to eliminate the drawbacks of sloping, have high wear resistance, and provide a seal packing that can be used for a long time per use. We discovered the new fact that the sealing pad for vulcanized pipes, which is composed of a vulcanized pipe seal and an aromatic polyamide fiber layer, is highly wear resistant and does not require frequent replacement of the seal pad, and completed the present invention. It happened.

The seal packing of the present invention will be explained below with reference to the drawings.

FIG. 3 is a sectional view of an embodiment of the seal packing of the present invention.
FIG. 4 is a sectional view of another embodiment of the seal packing of the present invention.

In FIG. 3, 9a is the seal packing of the present invention, 11
1 is a bowl-shaped pressure receiving portion with a hole 10 formed in the center, and 12 is a flange portion continuous to the periphery of the pressure receiving portion 11.

The entirety of the seal packing 9a having such a shape is formed into a sandwich-like laminated structure in which an aromatic polyamide fiber layer 13 is sandwiched between rubber material layers 14.

The rubber material layer 14 can be made of conventional hard chloroprene rubber of Shore A85-90 with added reinforcing carbon or silica such as l5AF or HAF, as well as general hard chloroprene rubber,
Other rubber materials may be used as appropriate.

As the aromatic polyamide fiber, for example, Kevlar fibers such as Kevlar 29 and Kevlar 49 manufactured by DuPont are preferably employed, and they can be suitably employed in the form of either woven fabric or non-woven fabric.

The method of using the seal gasket 9a, which has a diagonal structure, is exactly the same as that of the conventional one. As shown in FIG. The flange portion 12 is attached to the product take-out lower of the mating vulcanization tube 4 so as to receive the pressure of the cooling water in the pressure receiving portion concave portion 11a.

The rubber material layer 14 of the seal packing 9a effectively seals the coolant under pressure, and the fiber layer 13 preferably prevents wear around the hole 11 through which the covered electric wire is inserted.

By the way, the example of the seal packing shown in Figure 3 has 4 to 5 times the durability compared to the conventional seal packing made only of hard chloroprene rubber, and it can be replaced once.
It can be used for 00-120 hours.

Furthermore, since the abrasion powder of the seal packing is extremely reduced, the laminated structure of the rubber material layer and the aromatic polyamide fiber layer, which is useful for improving the factory environment, is as shown in FIG.
In addition to being sandwiched between the rubber material layers 14, the fiber layers 13 may be formed on both sides of the rubber material layer 14 as in the seal packing 9b shown in FIG. 4, or the fiber layers may be formed on only one side of the rubber material layer 14. 13 may be formed, and furthermore, a multilayer structure may be formed.

The seal packing of the present invention can significantly improve the durability of seal packing used as a consumable material in continuous extrusion vulcanization equipment for heating coating rubber of electric wires, etc., and its practical value is extremely high. There is something big.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view of a continuous extrusion vulcanization device related to the seal packing of the present invention, Fig. 2 is an enlarged sectional view of section A in Fig. 1, and Fig. 3 is an embodiment of the seal packing of the present invention. 4 is a sectional view of another embodiment of the seal packing of the present invention. Main code of drawing, 9.9as9b” seal packing, 1
0: hole, 13: aromatic polyamide fiber layer, 14: rubber material layer.

Claims (1)

[Claims for Utility Model Registration] 1. Placed at the outlet of an extrusion continuous vulcanization device, the cooling liquid in the cooling section inside the vulcanization tube is sealed under pressure, and the continuously vulcanized rubber-coated electric wire is transferred. A sealing packing for a vulcanized pipe having a hole in the center thereof, characterized in that the sealing packing consists of a rubber material layer and an aromatic polyamide fiber layer. 2. The seal packing according to claim 1, wherein the rubber material layer is made of hard chloroprene rubber. 3. The seal packing according to claim 1, wherein the fiber layer is interposed between rubber material layers. 4. The seal packing according to claim 1, wherein the rubber material layer is interposed between the fiber layers. 5. The seal packing according to claim 1, wherein the fiber layer is closely attached to one side of a rubber material layer.