JPS58104712A - Mixed solution supply device - Google Patents

Abstract

PURPOSE:To prevent mixed solution from stagnating in the supply pipe, in a mixed solution supply device, by a method wherein a return pipe is provided to connect a point near the end of a supply pipe for mixed solution from a tank to the point to be supplied with the tank so that the mixed solution flows through a circulating passage. CONSTITUTION:In a mixed solution supply device, a mixed solution supply pipe 10 for connecting the bottom of a tank 2 with an extruder cylinder 9 is provided in order to supply a mixed solution 1 from the tank 2 to the extruder 8. A mixed solution supply pump 11 is provided in the middle of this supply pipe 10 to supply the solution 1 by a fixed amount. A return pipe 12 is connected between a point near the end of the supply pipe 10 and the tank 2 and when the solution 1 is not supplied to the extruder 8, the solution 1 is returned to the tank 2. In this manner, the component of the mixed solution is prevented from accumulating and stagnating in the supply pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for supplying a liquid mixture of a plurality of components having different specific gravities.

For example, an extruder for producing a crosslinked cable is supplied with a crosslinking agent and an anti-aging agent.1. These are kneaded with an extrusion plastic material in an extruder cylinder and extruded onto the outer periphery of the cable conductor.

In this case, the melting point of the dichloromethane used as a crosslinking agent, for example, is about 40°C, and the specific weight is α984 (
For example, 4,4'-thiobis(6-tertbutyl-5-
The melting point of methylphenol is approximately 170℃, and the specific gravity is 1.0.
7 (70℃), and both of these were heated in a tank at about 70℃.
When heated to ℃, the anti-aging agent also melts due to the compatibility effect. This mixed solution is fed into the extruder cylinder through the supply pipe while being stirred in the tank, but when the supply of the mixed solution is stopped, such as when the line is stopped, the anti-aging agent with a high melting point precipitates in the supply pipe. The disadvantage is that the pipes are easily clogged.

An object of the present invention is to provide a mixed liquid supply device that can prevent clogging of the mixed liquid in a supply pipe.

The mixed liquid supply equipment company according to the present invention provides a return pipe that connects the tank and a point near the end of the supply pipe that supplies the mixed liquid from the tank to the supplied location, and connects the tank to the circulation path consisting of the supply pipe → return pipe → tank. Even if you let the mixed liquid flow and make sure that the mixed liquid does not clog the supply pipe.

The present invention will be described in detail below using an example of SM applied to a feeding device for a mixed liquid of a crosslinking agent and an anti-aging agent in the FII4t-extrusion type according to the present invention. As shown in FIG. 1, the mixed liquid supply device of this example is as follows:
It has a tank 2 containing a mixture of a cross-linking agent and an anti-aging agent, and a heating jacket is attached to the outer circumference of the tank 2. A medium is circulated and supplied to heat the mixed liquid 1 in the tank 2. The outside 11 of the heating jacket is covered with a heat insulating material 6 to prevent heat from escaping.The mixed liquid 1 is stirred by a stirrer 7. In order to supply the mixed liquid from the tank 2 to the extruder 8, a mixed liquid supply pipe 10 is provided that connects the garden part of the tank 2 and the extruder cylinder 9, and a mixed liquid supply pump 11 is installed in the middle of this supply pipe 10. is provided, and the mixed liquid 1 is supplied in a fixed amount at a time. A return pipe 12 is connected between the tube at the end of the supply pipe 10 and the tank 2, and is configured to return the mixed liquid 1 to the tank 1 when the mixed liquid 1 is not supplied to the extruder 8. There is. The supply pipe 1 on the end side of the branch connection point of the return pipe 12, that is, on the side of the extruder cylinder 9
A main switching valve 14 and a return switching valve 16 are connected to the terminal 0 and the middle of the return pipe 12 (for example, at a position near a branch connection point). It is designed to be closely controlled.

Now, at the time of starting, the return switching valve 16 is controlled once as shown in FIG. 2, for example, and the opening degree of the main switching valve 14 is controlled as shown in FIG. 5, for example. That is, pump 1
The flow rate of the mixed liquid 1 supplied to the extruder 8 by the extruder 1 is constant), and the return pipe 12 is
Flow the mixed liquid 1 through the pipes and circulate the mixed liquid 1. Then, as the main switching valve 14 is opened for 11 hours, the return switching valve is gradually closed, and after Tm time, the return switching valve 16 is completely closed to supply all of the mixed liquid 1 to the extruder 8. .

Experimental example 1 The flow rate of the pump 11 is set to t0t/m, and the line is stopped □ or
A, close the switch valve 14, open the 'p-' switch valve 16 to circulate the mixed liquid 1, set the flow rate of the pump 11 to 2.0t/III from the start of the line,
Figure Flow Rate - IIIK The valve operation according to the valve controller 15.16
In this case, 'r4 m5 ~ 4 minutes, T snow ~ 2 minutes. The extruder 8 used had an inner diameter of 115 mm, the extrusion material used was polyethylene, the crosslinking agent was dicumyl peroxide, and the anti-aging agent was 4,4'-thiobis(6-tert-butyl-5- methylphenol) was used.

Experimental Example 2 The pump 11 was stopped when the line stopped, and the pump 11 was started when the line started. At this time, tank 2. Supply pipe 10. The return pipe 12 is sufficiently heated at the start, the return switching valve 18 is opened, and the main switching valve 14 is closed. Return to tank 2 and add new good mixed liquid 1 to tank 2 - supply pipe 10
- The supply pipe 10 is immersed by circulating through the return pipe 12, and then the return switching valve 1δ is closed and the main switching valve 14 is opened to supply the mixed liquid 1 to the extruder 8.

In this case, 7. = 1Q minute, T3-5 to 4 minutes. 9. The extruder 8 has an inner diameter of 115 mm, the extrusion material is Hiropolyethylene, the crosslinking agent is dicumyl peroxide, and the anti-aging material is 4.4' - Thiobis(6-tert-butyl-3-methylphenol) may be used. The anti-aging agent was mixed into the crosslinking agent at a ratio of 1/10.

Although the above embodiment describes a mixed liquid supply device for an extruder, the present invention is not limited thereto, and can be similarly applied to, for example, a pigment-based ink supply device to an inkjet printing machine. can.

As explained above, according to the mixed liquid supply device according to the present invention, it is possible to prevent components of the mixed liquid from accumulating and clogging the supply pipe. 1+According to the present invention, control can be performed simply by switching valves, so there is an advantage of good workability.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a schematic configuration of an embodiment of the device according to the present invention, and FIGS. 2 and S are flow curve diagrams showing the bending characteristics of six valves. 1... Mixed liquid, 2... Tank, 10... Supply pipe,
11...Pump, 12...Return pipe, Yes, 14
...Switching valve・＠Fig. 1 Fig. 2 Fig. 3

Claims (1)

[Claims] In a mixed liquid supply device that supplies a mixed liquid from a tank to a supplied location via a supply pipe, a return pipe is provided that connects the end of the supply pipe to the tank, and a return pipe is provided that connects the end of the supply pipe with the tank. A mixed liquid supply device characterized in that switching valves are provided in the side supply pipe and in the middle of the return pipe, respectively.