JPH0611100A - Method for preventing highly viscous fluid from blocking tube - Google Patents

Abstract

PURPOSE:To prevent a tube from being blocked by caking a highly viscous fluid which is solidified if heated in the pipe laid in a high temperature environment. CONSTITUTION:A solenoid valve 6 is set OFF, and injection of highly viscous fluid from a nozzle 3 is stopped. Afterward, a solenoid valve 8 is switched ON, and water is charged into a main pipe between the solenoid valve 6 and the nozzle 3. The water is then replaced with the highly viscous fluid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing a highly viscous fluid which solidifies when heated in a pipe arranged in a high temperature environment such as a hot rolling facility from solidifying and clogging the pipe.

[0002]

2. Description of the Related Art Supply of a lubricating liquid for rolling which is a viscous aqueous solution supplied for preventing seizure of rolls in pipes in a high temperature environment through which a highly viscous fluid which solidifies when heated is passed, for example in hot rolling equipment. The pipe often suffers a failure due to the solidification of the lubricating liquid remaining in the supply pipe when the supply of the lubricating liquid is stopped.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and prevent solidification of a highly viscous fluid in a supply pipe under a high temperature environment.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention is designed to replace the highly viscous fluid in the supply pipe with an incoagulated fluid after the supply of the highly viscous fluid is stopped. That is, the present invention is characterized in that the high-viscosity fluid in the supply pipe is replaced with the non-coagulated fluid after the supply of the high-viscosity fluid is stopped in order to prevent the high-viscosity fluid from solidifying in the high-temperature environment. Is. Examples of the non-coagulating fluid include water, steam, air, and an inert gas such as nitrogen.

FIG. 1 shows an example of use in the method of the present invention. A branch pipe 5 for injecting water is provided in a main pipe 4 for supplying a lubricating liquid for rolling from a tank 2 to a nozzle 3 by a pump 1. The main pipe 4 and the branch pipe 5 are connected to the former main pipe 4 and the solenoid valve 6 is connected.
However, the latter branch pipe 5 is provided with a check valve 7 and a solenoid valve 8, respectively. In the figure, 9 is a relief valve.

In the apparatus constructed as above, the pump 1 is operated with the solenoid valve 6 turned on and the solenoid valve 8 turned off.
Iron oxide powder is added to the cross-linked acrylic acid polymer that has been pumped by, and the neutralizing rolling lubricant is sprayed from each nozzle 3, but the solenoid valve 6 is turned off to spray the rolling lubricant. After the stop, the solenoid valve 8 is turned on, and water is injected into the main pipe between the solenoid valve 6 and the nozzle 3 to replace the lubricating fluid for rolling. After replacement, the solenoid valve 8 is turned off.

In the apparatus shown in FIG. 2, a branch pipe 12 is connected to a switching valve 13 provided in a main pipe 11 through which a lubricating liquid for rolling is passed, and by switching the switching valve 13, water is injected into the main pipe 11 through the branch pipe 12. After the replacement of the lubricating liquid for rolling in the main pipe between the switching valve 13 and the nozzle 14 with water, the switching valve 13 is switched and the supply of water together with the lubricating liquid for rolling is stopped. It has become.

[0007]

As described above, according to the present invention, the supply of the high-viscosity fluid is stopped and then the high-viscosity fluid in the supply pipe is replaced with the non-solidifying fluid. Blockage can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic view of a piping device used in the method of the present invention.

FIG. 2 is a schematic view of another device.

[Explanation of symbols]

1 ... Pump 3, 14
・ ・ ・ Nozzle 4, 11 ・ ・ ・ Main pipe 5, 12
・ ・ ・ Branch pipes 6, 8 ・ ・ ・ Solenoid valve 13 ・ ・
・ Switching valve

Claims (1)

[Claims] 1. A method for preventing blockage due to solidification of a highly viscous fluid in a supply pipe of a piping device installed in a high temperature environment after the supply is stopped, in which a high viscosity fluid is supplied in the supply pipe after the supply is stopped. A method for preventing blockage of a supply pipe, which comprises replacing a highly viscous fluid with an incoagulated fluid.