JPH025930Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a continuous extrusion vulcanization device used for manufacturing vulcanized elongated bodies such as electric wires and hoses.

As a continuous extrusion vulcanization device, a horizontal vulcanization cylinder is connected to the head of the extruder, and the vulcanization cylinder is filled with molten salt (hereinafter referred to as liquid heating medium) at a predetermined liquid level, and the vulcanization is performed above the liquid level. One that pressurizes with pressurized gas is known. In this device, the liquid heat medium leaks from the elongated vulcanizate passing hole at the exit of the vulcanizing tube, and the liquid level inside the vulcanizing tube decreases, so when the liquid level drops to a predetermined lower limit level, , it is necessary to supply a liquid heat medium into the vulcanization cylinder to restore its liquid level.

However, when a liquid heat medium is supplied into the vulcanization cylinder to restore the liquid level, fluctuations in the liquid level within the vulcanization cylinder are unavoidable.

According to the experimental results of the present inventors, this liquid level oscillation is caused by the oscillation of the long body to be vulcanized in the vulcanization cylinder, the slight vibration of the long body at the die location of the extruder, and the surface of the extrudate. The occurrence of minute irregularities is unavoidable. Although these irregularities are minute, they affect the gloss of the product appearance and are undesirable.

Further, the fluctuation of the liquid level described above is undesirable because it causes a malfunction in detecting the position of the liquid level installed in the vulcanization tank, which will be described later.

Based on the above findings, the present invention provides a continuous extrusion vulcanization device that can supply a liquid heat medium into a vulcanization cylinder without fluctuation of the liquid level and can produce a vulcanized long body with a good appearance. , the gist of which is as stated in the claims of the utility model registration of the present application.

Hereinafter, the present invention will be described with reference to embodiments.

In FIG. 1, 1 is an extruder head, and 2 is a horizontal vulcanizing tube. The vulcanizing tube 2 is connected to the extruder head 1 via a splice box 3. 4 is a liquid heat medium in the vulcanizing tube 2, and 5 is a liquid level sensor. Reference numeral 6 denotes a water circulation type cooling cylinder, which is connected to the vulcanization cylinder 2 via a separation chamber 7. As shown in FIG. 2A, the inlet of the separation chamber 7 is connected to a hole 71 through which the vulcanized elongate body passes, and is in pressure communication with the upper part so that the liquid heat medium in the vulcanization cylinder does not excessively leak into the separation chamber 7. A partition plate 70 having a cutout 71' is provided.
The passage hole 71 can also be shaped like a slot, as shown in FIG. 2B. At the exit of the separation chamber 7,
A packing 72 is provided to prevent the cooling water from the cooling tube 6 from entering the separation chamber 7. Reference numeral 73 denotes a partition having an insertion hole for the vulcanized elongated body, which is provided approximately at the center of the separation chamber 7, and is used to prevent the liquid heat medium leaking from the vulcanizing cylinder 2 and the cooling water leaking from the cooling cylinder 6. Prevents mixing. 74 is a pipe for returning the cooling water leaked from the cooling cylinder 6 to a cooling water supply tank (not shown), and 75 is a cooling water supply pipe provided in the cooling cylinder 6.

8 is a storage tank for a liquid heat medium, and is provided at a lower location than the vulcanizing cylinder 2. The storage tank 8 and the separation chamber 7 are connected by a return pipe 76, and the vulcanizing cylinder 2 and the storage tank 8 are connected by drain pipes 9, 9.
The volume of the storage tank 8 is larger than the volume of the vulcanization cylinder 2,
When the valves 91, 91 of the drain pipes 9, 9 are opened, the liquid heat medium in the vulcanization cylinder can be collected in the storage tank. Reference numeral 10 denotes an overflow pipe, which prevents the liquid level 40 in the vulcanizing cylinder 2 from exceeding a certain level. 11 is a pump chamber provided at one end of the storage tank 8, in which a submersible pump 111 is provided. 112 is a motor. Reference numeral 12 denotes an auxiliary storage tank, which is provided above the vulcanization cylinder 2. The auxiliary storage tank 12 and the pump 111 are connected to each other by a feed pipe 13.
2 and the storage tank 8 are communicated with each other by an overflow pipe 14, and the bottom of the auxiliary storage tank 12 is connected to the vulcanization cylinder 2.
A supply pipe 15 with a valve 151 communicates with the two. This supply pipe 15 communicates with the vulcanizing cylinder 2 at a position 511 near the bottom thereof.

16 is a gas pressurization source (compressor or gas cylinder), which is located in the space above the liquid level in the vulcanizing cylinder 2, and in the storage tank 8.
A space above the liquid level in the pump chamber 11, a space above the liquid level in the pump chamber 11,
In addition, the space above the liquid level of the auxiliary storage tank 12 is pressurized by pressurized gas (air, inert gas) from a gas pressurization source 16 via piping 18, .

In FIG. 1, the liquid heat medium can be circulated as necessary along the route of storage tank 8 → pump chamber 11 → pump 111 → feed pipe 13 → auxiliary storage tank 12 → overflow pipe 14 → storage tank 8. If this is done continuously at all times, it can contribute to preventing solidification of the liquid heat medium. Although the above circulation route is heated with electric heating wires, the occurrence of localized low-temperature spots is unavoidable, and the above-mentioned continuous circulation is extremely effective in preventing the liquid heat medium from cooling and solidifying in those low-temperature spots. It is.

The liquid level 120 of the auxiliary storage tank 12 is the same as the overflow pipe 14 when supplying the liquid heat medium into the vulcanization cylinder 2.
It is regulated and kept at a constant level at all times.

On the other hand, when the liquid heat medium in the vulcanization cylinder 2 leaks from the vulcanization elongate body passage hole of the partition plate 70 at the entrance of the separation chamber, it is returned to the storage tank 8, so that the liquid level 40 in the vulcanization cylinder decreases. When the liquid level 40 reaches the lower limit level, the liquid level sensor 5 is activated and an alarm is issued. After this alarm, the valve 151 of the supply pipe 15 between the auxiliary storage tank 12 and the vulcanizing cylinder 2 is opened, and the liquid level 4
to restore it to its normal predetermined level.

In this case, since the liquid level 120 of the auxiliary storage tank 12 is constant as described above, the supply pressure of the liquid heat medium by the supply pipe 15 is constant, so a constant flow rate can be guaranteed, and the liquid outlet of the supply pipe 15 is 511 is below the liquid level 40 in the vulcanizing cylinder 2, it is possible to effectively prevent the liquid level in the vulcanizing cylinder 2 from fluctuating.

Furthermore, as shown in FIG. 2, the aforementioned notch 71' or slot 7 is provided in the partition plate 70 at the entrance of the separation chamber.
1, the pressure in the separation chamber and the space above the liquid level in the vulcanization cylinder can always be kept at the same pressure, so it is possible to avoid gas hunting that may occur due to the differential pressure between them, and the vulcanization caused by this hunting can be avoided. Fluctuations in the liquid level inside the cylinder can also be reliably eliminated.

In the device of the present invention, at the start of continuous extrusion vulcanization, the pump 111 is driven to raise the liquid level in the auxiliary storage tank 12 to the overflow level of the overflow pipe 14, and then the valve 151 of the supply pipe 15 is opened and the A liquid heat medium is supplied into the sulfur cylinder 2. Therefore, even during this supply, the liquid level in the auxiliary storage tank 12 is at a constant level, as in the case described above, and a constant flow rate can be guaranteed, so that the fluctuation of the liquid level in the vulcanizing cylinder 2 is sufficient. It is possible to prevent the occurrence of irregularities on the surface of the extruded elongated body.

As described above, according to the continuous extrusion vulcanization apparatus according to the present invention, the horizontal vulcanization tank connected to the extruder head is filled with a liquid heat medium at a predetermined liquid level, and the liquid level is filled with pressurized gas. In a pressurized continuous extrusion vulcanization device, the liquid heating medium can be supplied into the vulcanization cylinder to restore the liquid level while preventing the liquid level from fluctuating. It is possible to prevent the vulcanized elongated body from shaking, and it is possible to avoid fine irregularities on the surface of the extrudate due to the vibration of the elongated body at the extrusion die location due to this shaking.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a continuous extrusion vulcanization apparatus according to the present invention, and FIGS. 2A and 2B are explanatory diagrams showing various examples of partition plates at the entrance of the separation chamber in the apparatus according to the present invention. In the figure, 1 is the extruder head, 2 is the vulcanization cylinder,
4 is a liquid heat medium, 8 is a storage tank, 9 is a drain pipe, 1
1 is a pump chamber, 111 is a pump, 12 is an auxiliary storage tank, 13 is a feed pipe, 14 is an overflow pipe, 1
5 is a supply pipe, and 151 is a valve.

Claims (1)

[Scope of utility model registration request] One end of the horizontal vulcanization tube, which is filled with a liquid heat medium at a predetermined liquid level and whose space above the liquid surface is pressurized with pressurized gas, is connected to the extruder head, and the liquid heat medium is placed near the vulcanization tube. A storage tank is provided, and an auxiliary storage tank is provided at a higher place than the vulcanization cylinder for supplying the liquid heat medium in the storage tank to the vulcanization cylinder, and the auxiliary storage tank and the storage tank are connected to a feed pipe via a supply pump. A continuous extrusion vulcanization apparatus characterized in that the auxiliary storage tank and the storage tank are connected to each other by an overflow pipe, and the bottom of the auxiliary storage tank and the vulcanization cylinder are connected to each other by a supply pipe equipped with a valve. .