JPS6013616Y2 - Vulcanization equipment for rubber and plastic long bodies - Google Patents

Description

[Detailed description of the invention] The present invention involves extrusion coating an unvulcanized rubber or plastic composition onto the core of an electric wire or composite hose using the crosshead of an extruder, and then using the elongated body made in this way. This relates to an improvement to a vulcanizing device that allows the high-temperature liquid heating medium to pass through the horizontal vulcanization tube, and is intended to prevent the liquid heating medium from solidifying in the splice transfer pipe that connects the crosshead and the vulcanization tube. .

It is possible to directly connect a horizontal vulcanizing tube to the crosshead so that the unvulcanized long body extruded from the horizontal extrusion die in the crosshead can be immediately vulcanized in a straight state (without curving downward). Although it is desirable from the standpoint of quality improvement, at the start of operation, a certain distance must be set between the plastic and the vulcanized tube in order to adjust the inner and outer diameters and wall thickness at the beginning of extrusion, and to process the product tip. Is required.

As a countermeasure against this, a splice box section (guide cylinder section) is provided at the tip of the vulcanized tube on the crosshead side, and the splice transfer pipe is fitted into this splice box section in a fluid-tight and slidable manner, and the splice transfer pipe is fitted on the crosshead side. It is conceivable to connect the vulcanized tube and the crosshead by protruding from the crosshead.

However, the vulcanizing tube including the splice box section is equipped with a heater to heat the internal liquid heating medium (for example, mixed nitrate with a melting point of 140°C) to 160 to 250°C, which is suitable for vulcanizing long bodies. However, since the splice transfer pipe is made to protrude from the splice box and there is no heating means after it is connected to the crosshead, there is a risk that the liquid heating medium may solidify within the splice transfer pipe.

In this invention, a splice transfer pipe is liquid-tightly and slidably fitted into the splice box at the tip of the vulcanizing tube, and this splice transfer pipe connects the vulcanizing tube to the crosshead to make it liquid-tight and allows the vulcanization to take place. In addition to heaters for the pipes and splice boxes, a heater for the liquid heating medium in the splice transfer pipe is provided to prevent the liquid heating medium at the inlet of the vulcanization tube from solidifying, and this will be explained below with reference to the drawings.

Figure 1 is a partial side view showing the open state of the device before starting operation;
FIG. 2 is a partial side view showing the closed state during operation, in which the crosshead 1 of FIG. 3 is extruded.

The cable 3 is a member that passes through a splice moving pipe 4, a splice box section 5, a vulcanized tube 6, a cooling tank (not shown), a take-up machine, and is wound up by a winding machine.

The vulcanized tube 6 is a horizontal cylindrical body, and is integrally equipped with a cylindrical splice box portion 5 that also serves as a part of the vulcanized tube at the tip on the crosshead 1 side, and the inside of the splice box portion 5 is not shown. A similarly cylindrical splice transfer pipe 4 is fitted in a fluid-tight and slidable manner via a sealing mechanism.

The tapered sealing surface 7 provided at the tip of the pipe 4 is pressed against the sealing surface (not shown) of the extrusion die 2 or the crosshead side block as shown in FIG. It plays the role of maintaining liquid tightness between the parts.

In the open state shown in FIG. 1, the distance L□ between the crosshead 1 and the pipe 4 is made large enough to facilitate wall thickness adjustment at the beginning of extrusion and processing of the product tip.
For example, autumn = 75-.

The half-divided upper heater 8 and lower heater 9 are in standby with a sufficient gap above and below the interval L□ in the open state (Fig. 1), and in the closed state (Fig. 2). The upper and lower halves of the splice transfer pipe 4 are held by another pressing mechanism which will be described later.

The upper and lower heaters 8 and 9 have semi-cylindrical surfaces 10 and 11 on the splice moving pipe 4 side that fit the outer cylindrical surface of the pipe 4 (Fig. 3).
It is an aluminum member with an electric heating element (
(not shown) is cast in.

Annular gap 12 between pipe 4 and cable 3 (Figure 3)
communicates with the internal space of the splice box part 5 and the vulcanizing tube 6, in which a liquid heating medium under normal pressure or under pressure can be accommodated up to a level sufficiently higher than that of the cable 3.

Furthermore, the vulcanizing tube 6 and the splice box part 5 are also equipped with heaters (band heaters, etc.) for heating the liquid heating medium inside.
is installed.

Fig. 4 is a partial side view showing a specific example of the device, and Fig. 5 is a partial side view showing a specific example of the device.
It is a view taken along the ■-■ arrow in the figure.

In FIG. 4, holders 15 and 16 at both ends of the splice box section 5 at the tip of the vulcanized tube are supported on a pedestal frame 19 via a thrust receiver 17 and a support leg 18.
The rod 21 of the air cylinder 20 fixed to the holder 15, 16 is connected to the bracket 22,
is integrally fixed to the splice moving pipe 4.

A pair of rods 23 fixed to the lower end of the bracket 22
is slidably supported by a guide 24 provided on the holder 15, so that the rod 21 can be inserted from inside the air cylinder 20.
When the pipe 4 is made to protrude in the direction of arrow A, the pipe 4 can protrude concentrically with the splice box part 5 to a position 4'.

A vertical air cylinder 27 is attached to another support leg 26 provided on the gantry frame 19, and a lower heater 9 is connected to the upper end of a rod 28 of the air cylinder 27.

A-rads 29 provided at both ends of the lower heater 9 are supported by guide tubes 30 of the supporting legs 26 so as to be movable up and down.

An inverted support leg 31 (
A vertical air cylinder 32 is attached to the air cylinder 32 (FIG. 5), and an upper heater 8 is connected to the lower end of the rod 33 of the air cylinder 32.

A vertical rod 34 fixed to both ends of the upper heater 8 is supported by a guide tube 35 of a support leg 31 so as to be able to move up and down.

The air cylinder 20 is connected to the upper heater as shown in FIG.
Therefore, during operation when the rod 21 protrudes to the position 21' in FIG. 4, the upper heater 8 can be lowered to the position 8'.

The two rods 23 of the father and son also occupy positions offset to both sides from the movement range of the lower heater 9, and therefore the lower heater 9 can be raised during operation when the rods 23 protrude to the position shown in FIG. 4, 23'. .

36 is a connecting bolt, 37 is a bolt 3 perpendicular to bolt 36.
6 and the bracket 38, 39 is the bracket on the crosshead side, 40 is a nut that is screwed into the bolt 36, and the bolt 36 is a notch (not shown) that is provided in the bracket 39 and opens outward in the radial direction. ) is fitted.

Before operation, after adjusting the wall thickness and processing the product tip in the open state shown in Fig. 1, the product cable 3 starts running by the take-off machine, the splice transfer pipe 4 is connected to the crosshead 1, and the upper and lower The half-split heater 8.9 is tied to the pipe 4, and vulcanization of the pipe 4 portion together with the vulcanizing pipe 6 and splice box section 5 is started, and the vulcanization work is started.

As explained above, in the present invention, since heaters (upper and lower heaters 8, 9) are provided for the liquid heating medium in the splice transfer pipe 4, the liquid heating medium solidifies in the pipe 4 corresponding to the vulcanization pipe entrance. This can be reliably prevented.

In addition, since a gap can be created between the crosshead 1 and the vulcanization part by the splice moving pipe 4, the operator can approach the extrusion die of the crosshead and adjust the inner and outer diameters and wall thicknesses at the beginning of extrusion before starting the operation. It is possible to easily perform processing operations for the tip of the product.

Furthermore, when embodying the present invention, the heater can also be incorporated into the wall thickness of the splice transfer pipe 4.

[Brief explanation of the drawing]

Figures 1 and 2 are schematic side views of the device in the open and closed states, respectively, Figure 3 is a sectional view taken along the line ■-■ in Figure 2, Figure 4 is a partial side view of the specific device, and Figure 5 is a side view of the device in the open and closed states, respectively. 5 is a view taken along the line V-V in FIG. 4. FIG. 1...Cross head, 4...Curved splice moving pipe, 5...Splice box section, 6...
Between vulcanized pipes, 8, 9...upper and lower heaters

Claims (1)

[Scope of utility model registration request] A splice transfer pipe is liquid-tightly and slidably fitted into the splice box at the tip of the heater-added sulfur tube, and this splice transfer pipe connects the vulcanization tube and the crosshead, housing a liquid heating medium inside, and splicing. A vulcanizing device for a long rubber or plastic body, characterized in that a heater is provided for a liquid vulcanizing medium in a moving pipe.