JPS6353818A - Continuously vulcanizing machine - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a continuous vulcanizer mainly used in the production of electrical cables. This invention relates to a vulcanizer that allows for even control of conditions.

[Conventional technology]

In a continuous vulcanizer for electric cables, etc., as shown in Figure 2, the crosshead 4 of the extruder 3 is used to vulcanize rubber or other material onto the core, for example, the conductor, of the cable 1 sent from the metering capstan 2. A procedure in which plastic is extruded and coated to a required thickness, then this coating layer is heated in the heating section 6 of the vulcanized tube 5, and then the softened coating layer is passed through the cooling section 7 and hardened while reaching the end seal 8. is taken.

In such a vulcanizer, water 11 is usually put into the vulcanizing tube 5 from a water supply channel 10 equipped with a pump 9 to the cooling section 7 for water cooling, and the heating section 6 is generally filled with steam. Alternatively, a method has been adopted in which gas is injected under pressure and used as a heat medium for the coating layer. Furthermore, if the liquid level inside the vulcanizing tube changes greatly, the heating conditions and cooling conditions will also vary greatly, making it impossible to obtain a product with stable quality. A surface detection device is provided, and a signal from the device is used to open and close the diaphragm valve 13 of the water supply channel to maintain the liquid level at a predetermined water level. In addition, since it is unavoidable that the liquid level changes due to evaporation or the like between the upper and lower detection limits of the liquid level, the drain port 14 of the hot cooling water is usually located below the lower limit of the liquid level. is also provided at the bottom.

15 is a drain valve, and 16 is a tensioning capsun.

[Problem that the invention seeks to solve]

According to the conventional vulcanizer described above, since the drain port 14 is located below the water surface, the water at the water surface is not replaced from the drain port, and the temperature of this stagnant water continues to rise, resulting in improper heating and cooling conditions. Problems may arise, such as the cable becoming unstable or dust floating and adhering to the cable surface. For example, the internal pressure of the vulcanizing tube 5 is set to 2
To 0? /d, the saturated steam temperature at the water surface rises to 211.4°C, and when the internal pressure is set to 10 to 9/cJ, it rises to 179°C, and no substantial water cooling effect can be expected in this area.

In addition, in the case of dry crosslinking in which gas is pressurized into the heating section 6, water vapor accumulates in the heating section due to a rise in the temperature of the water surface, resulting in substantially the same conditions as steam crosslinking, and water intrusion is expected.
There are cases in which crosslinking is not performed properly.

Therefore, the object of the present invention is to eliminate the accumulation of cooling liquid above the drain port of the vulcanization pipe, stabilize the crosslinking conditions of the extruded coating layer, and thereby improve the quality reliability of the product.

[Means for solving problems]

In order to achieve the above object, the present invention has been developed in a vertical, inclined or catenary type continuous vulcanizer in which a cooling liquid stagnation phenomenon occurs, as shown in Fig. 1 (this figure takes a catenary type as an example). 1), a sensor 17 detects the temperature near the liquid surface of water 11 injected into the vulcanizing pipe 5, one end is connected to the water supply channel 1o on the outlet side of the diaphragm valve 13, and the other end is connected to the drain port 14. and a branch pipe 18 connected to the vulcanizing pipe 5 between the water surface and the water surface, and a solenoid valve 1 inserted in the middle of this branch pipe.
9, and a temperature control device 2 that sends an open signal to the solenoid valve 19 when the detection signal from the sensor 17 exceeds a predetermined temperature level.
o.

It is sufficient to have at least one temperature sensor 17 and one branch pipe 18 equipped with a solenoid valve, or one sensor 17 and one branch pipe 18 at corresponding height positions may be used as a pair, and multiple pairs may be combined. They may be provided at different positions in the longitudinal direction of the sulfur pipe 5. Moreover, each branch pipe 18 at this time may be one branched from one branch pipe connected to the liquid supply path, as shown in the figure. In terms of simplifying the piping, this branching method is more advantageous than connecting each branch pipe to the water supply channel individually.

Furthermore, the cooling fluid is not limited to water as described in the text.

[Effect]

In the vulcanizer of the present invention constructed as described above, the water level is detected by the liquid level detector described in FIG. is maintained. In addition, in order to keep the circulation of water in the vulcanization pipe constant, the drain valve 1
5 is always kept in a moderately open state, and the water supply channel 10 also supplies an amount of water commensurate with the discharge amount.

When the temperature sensor 17 detects that the temperature of the accumulated water exceeds a predetermined level, the signal is fed back to the control device 20 and the solenoid valve 19 is controlled by a command from the device 20.
is opened, and the water above the drain port 14 is replaced. In addition, when the water temperature in the part concerned falls below a predetermined level due to this replacement, the electromagnetic valve 19 is closed, and by repeating the above operation, an increase in the water temperature near the water surface is prevented. It should be noted that if there are multiple pairs of temperature sensors 17 and branch pipes 18, the water can be replaced in several sections in the longitudinal direction of the pipes, making temperature control more accurate.

〔effect〕

As described above, the vulcanizer of the present invention includes a temperature detecting means near the liquid surface of the cooling liquid, a branch pipe for supplying the cooling liquid into the vulcanizing tube between the discharge port and the liquid surface, and a temperature detecting means for detecting the temperature near the liquid surface of the cooling liquid. A temperature control device is installed that receives a signal from the device and sends an opening/closing command to the solenoid valve in the branch pipe, and replaces the coolant at the liquid level when it reaches a predetermined temperature. Retention and temperature rise will disappear.

Therefore, crosslinking conditions are maintained stably, floating dust is properly discharged, and there is no need to worry about water intrusion during dry crosslinking, making it possible to obtain a crosslinked cable with high quality reliability.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing an example of a vulcanizer according to the present invention, and FIG. 2 is a diagram showing an example of a conventional vulcanizer. 2...metalling capstan, 3...extruder,
4... Crosshead, 5... Vulcanized pipe, 6... Vulcanized...
Tap, 7...Cooling part, 8...End seal, 9...
・Pump, 1゜... Water supply channel, 12 &... IT detector, 13... Diaphragm valve, 14... Drain port,
15... Drain valve, 16... Tensioning capstan, 17... Temperature sensor, 18... Branch pipe, 1
1... Solenoid valve, 20... Temperature control device,

Claims (3)

[Claims] (1) In a vertical, inclined or catenary type continuous vulcanizer equipped with a liquid level control mechanism in the vulcanizing tube, a means for detecting the temperature near the liquid surface of the cooling liquid in the vulcanizing tube and one end of the vulcanizing A branch pipe whose other end is connected to the vulcanizing pipe between the liquid drain port of the vulcanizing pipe and the liquid level in the liquid supply path to the pipe, and a solenoid valve inserted in the middle of the branch pipe, A continuous vulcanizer characterized in that it is provided with a temperature control device that issues an open signal to a solenoid valve of a branch pipe when a signal received from the temperature detection means exceeds a predetermined temperature level. (2) The branch pipes having the temperature detection means and the electromagnetic valve are arranged in pairs with corresponding height positions, and the plurality of pairs are provided at different positions in the longitudinal direction of the vulcanized tube. A continuous vulcanizer according to claim (1). (3) The continuous vulcanizer according to claim (2), wherein each of the branch pipes is branched from a single branch pipe connected to the liquid supply path.