JPS6016045B2 - Dry crosslinking equipment - Google Patents

Description

[Detailed description of the invention] TECHNICAL FIELD The present invention relates to improvements in cable dry-crosslinking equipment.

Conventionally, as a cross-linking device for manufacturing rubber or plastic cables, a high-temperature inert gas is circulated through a cross-linked pipe in which a cable coated with rubber or the like is continuously run to cross-link the coat. A type of dry cross-section device is known.

FIG. 1 shows a vertical crosslinking device, in which a crosslinking pipe 2 connected to an extruder 1 is connected to a gas circulation path 5 equipped with a heater 3 and a circulation blower 4, such as a gas circulation Road 5
A high-temperature inert gas is blown into the cross-linked pipe 2 through the opening 5a of the cross-linked pipe 2 and circulated in the direction of arrow A, and the covered cable 7 is extruded from the extruder 1 and runs toward the cooling water 6 below the cross-linked pipe 2.
are cross-linked.

By the way, this high-temperature inert gas has a temperature of over 25,000,
The high temperature and high pressure inert gas is used at a pressure of 3k9' or above, and is sent out laterally to the bridge pipe 2 from the opening (outlet) 5a at the connecting part 2a that connects the gas circulation path 5 of the bridge pipe 2. There is.

Therefore, the coated cable in a softened state immediately after extrusion may be deformed in the lateral direction when passing through the connecting portion 2a. In addition, the covered cable may swing within the bridged pipe 2 and rub against the inner wall of the pipe, causing damage to the coating, or the core wire speed at the crosshead of the extruder 1 may fluctuate, causing a change in the cable's outer diameter. Therefore, it has been considered to insert a baffle plate in the closing port 5a to remove the influence of the inert gas sent out laterally, but in this case, the pressure loss of the circulating inert gas becomes significantly large. There was a drawback that the capacity of blower 4 had to be increased. The present invention was made in view of the drawbacks of such a conventional system, and a gas circulation path is connected to a cross-linked pipe connected to an extruder, and a high-temperature inert gas as a heat medium is circulated within the cross-linked pipe. In the dry crosslinking device, the connecting portion of the crosslinked pipe that connects the gas circulation path is connected to a conduit of the crosslinked pipe that is spaced apart from each other so as to have a concentric annular gap between the pipe and the pipe. and an outer mantle wall formed across the annular gap, and the gas circulation paths are located in a tangential direction with respect to the annular gap so that the circulating gas in the hollow tube forms a swirling flow. It is an object of the present invention to provide a dry crosslinking device connected to the mantle wall. The present invention will be explained in detail below based on the drawings. As shown in FIG. 2, the crosslinking apparatus of the present invention has an inert gas circulation path 10 connected to a crosslinking pipe 9 connected to an extruder 8, and its basic structure is the same as that of the conventional apparatus shown in FIG. The connecting portion SA of the bridge pipe 9 to which one end (total gas blowout) 10a of the circulation path is connected separates the bridge pipes 9a and 9b so as to have a gateway 11a, and connects the end of the pipe 9B to the pipe 9a. A cylindrical wall 12a is formed across the pipe ga, and a circular gap 13a is formed between the pipe ga and the cylindrical wall 12a. The gas outlet end 10a of the circulation path is connected slightly above the cylindrical wall 12a, and as shown in FIG. Thus, they are positioned on the tangential direction. By forming the cylindrical air space 13a and connecting the gas blowing pipe 10a tangentially to it, the high-temperature, high-pressure inert gas blown out from this is rotated, forming a swirling flow. The bridge pipe 9 passes through the opening 11a.
Since the inert gas can be fed into the pipe line 98, the inert gas does not cause a large pressure loss and does not directly hit the coated cable 14 and cause it to deform or swing.

Furthermore, since the contact with the coated cable 14 is high, heat can be sufficiently transmitted and the crosslinking efficiency can be improved. Next, inert gas circulation path 10
A bridge pipe connecting portion 98 connecting the pond ends (gas suction and return ends) 10b is also formed in the same manner as the connecting portion 9A, but is symmetrical.

Here, the high-temperature, high-pressure inert gas enters the annular gap 13b formed by the pipe 9d and the cylindrical wall 12b while rotating from the pipe 9c through the opening 11b between the pipe 9d and the pipe 9d, and enters the bridge pipe. so that the circulating gas forms a swirling flow,
The gas is returned to the gas suction return end 10b located in the tangential direction of the gap. Since the inert gas is returned from the conduit 9c of the bridge pipe to the suction end 10b of the gas circulation path 10 while rotating in this way, there is little resistance to the inert gas, and the coated cable 14 is not swung. Nor. Although the inert gas is circulated from top to bottom in the crosslinked pipe 9 as shown by arrow B, it may be circulated from bottom to top. Although the above embodiments have been explained by taking a vertical type bridging device as an example, the present invention can be similarly implemented in a horizontal type bridging device. As is clear from the above description, in the present invention, the connecting portion of the bridge pipe that connects the inert gas circulation path is placed between the pipe line of the bridge pipe which is spaced apart from each other and the pipe line. ○A mantle wall formed across the pipe line so as to have an annular gap, and the gas circulation line is
The gas circulation path is connected to the mantle wall and positioned tangentially to the annular gap so that the circulating gas in the bridge pipe forms a swirling flow, while rotating the high-temperature and high-pressure inert gas. Since the inert gas is blown out into the cross-linked pipe and vice versa, there is no need to increase the capacity of the circulation blower as there is little resistance to the inert gas. No damage to the coating will occur due to contact.

Furthermore, since the gas circulates in a swirling flow over the entire length of the bridged pipe, the contact time between the gas and the cable sheathing is increased, which in turn improves the heat transfer efficiency of the medium.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing a part of a conventional vertical dry crosslinking device;
FIG. 2 is a cross-sectional view showing a part of the vertical dry crosslinking apparatus of the present invention, and FIG. 3 is a cross-sectional view of the upper portion of the connecting portion 9A. 8...Extruder, 9...Kasenmasu tube, 9a, 9
b, 9c, 9d...Bridged pipe, 9A, 9B...
...Connection part, lo.... ...Inert gas circulation path, 12
a, 12b...1 cylindrical wall, 13a, 13b...
... Concentric annular gap, 14 ... Sheathed cable. Figure 3 Figure 1 Figure 2

Claims (1)

[Claims] 1 Connect the gas circulation path to the crosslinked pipe connected to the extruder,
In a dry crosslinking device that circulates a high-temperature inert gas as a heat medium in a crosslinked pipe, a connection portion of the crosslinked pipe that connects the gas circulation path is connected to a conduit of the crosslinked pipes spaced apart from each other. , and an outer mantle wall formed astride the pipe line so as to have a concentric annular gap therebetween, and the gas circulation path is configured such that the gas in the bridged pipe forms a swirling flow. The dry crosslinking device is characterized in that the device is connected to the mantle wall at positions tangential to the annular gap.