JPH067717A - Method for preventing nozzle from being blocked - Google Patents

Abstract

PURPOSE:To prevent a nozzle from being blocked by a method wherein a main pipe having a nozzle on its apex is connected with a branch pipe for a substitution fluid and when ejection of the aimed fluid is stopped, ejection is switched to ejection of the substitution fluid and during ejection of the aimed fluid is stopped, ejection of the substitution fluid is continued. CONSTITUTION:A branch pipe 5 is connected with a main pipe 1 connecting a nozzle 3 with a tank 2 through a pump 1 between the pump 1 and the nozzle 3. A solenoid valve 8 is mounted between the branch pipe 5 and the pump 1 and a relief valve 15 is connected therewith. In addition, branched pipes 6 and 7 are connected with the branch pipe 5 through a check valve 9 and are connected with feeding sources of water and steam through electromagnetic valves 13 and 14 and check valves 11 and 12. When the solenoid valve 8 is made ON and the solenoid valves 13 and 14 are made OFF, an aimed fluid is ejected. When ejection of the aimed fluid is stopped, the solenoid valve 8 is off and either of the solenoid valves 13 and 14 is made ON to feed water or steam to the nozzle 3 to clean the nozzle 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of preventing a nozzle from being clogged by foreign matter adhering from the outside or solidification of a viscous fluid after completion of injection.

[0002]

2. Description of the Related Art A nozzle is generally used for jetting and spraying a fluid at a high speed, but depending on the working environment, for example, in a dust atmosphere, when the jetting is completed, dust adheres to the nozzle to cause nozzle clogging. is there. Nozzle clogging may also occur after the injection is completed in a high temperature environment or due to the properties of a viscous fluid, such as when supplying a rolling lubricating liquid consisting of a viscous aqueous solution to the roll to prevent seizure of the roll in the hot rolling process. It also tends to occur due to solidification of the fluid.

Conventionally, this problem has been dealt with by enlarging the nozzle diameter to prevent nozzle clogging, or replacing the nozzle when nozzle clogging occurs.

[0004]

Increasing the diameter of the nozzle so as not to cause nozzle clogging reduces the jetting speed and requires bringing the nozzle closer to the object, which also reduces the jetting area. In addition to requiring a large number of nozzles, there are problems such as an increase in the injection amount per unit area. There is no room in the work space for nozzle replacement,
Further, it is not easy to perform the replacement work under the bad working environment, and the injection must be stopped during that time.

The present invention has been made for the purpose of solving the above problems, and it is an object of the present invention to prevent the clogging of the nozzle without increasing the diameter of the nozzle and to replace the nozzle.

[0006]

In order to achieve the above object, the present invention is designed to inject an alternative fluid consisting of an inert gas such as water, air, steam or nitrogen after the end of injection. That is, the nozzle blockage prevention method of the present invention is provided with a nozzle at the tip, and a branch pipe for passing an alternative fluid is connected to a main pipe for passing a target fluid, and when the injection of the target fluid is stopped, switching to the alternative fluid is performed. It is characterized in that the alternative fluid is jetted after the jetting of the target fluid is stopped.

[0007]

FIG. 1 shows an example of an apparatus used in the method of the present invention. A branch pipe 5 is connected to a main pipe 4 for supplying a rolling lubricant from a tank 2 to a nozzle 3 by a pump 1.
A branch pipe 6 for further injecting water and a branch pipe 7 for injecting steam are connected to the branch pipe 5. An electromagnetic valve 8 is provided on the main pipe 4, a check valve 9 is provided on the branch pipe 5, and check valves 11 and 12 and electromagnetic valves 13 and 14 are provided on the branch pipes 6 and 7, respectively. In the figure, numeral 15 is a relief valve.

In the apparatus constructed as described above, with the solenoid valve 8 turned on and the solenoid valves 13 and 14 turned off, the rolling lubricating liquid pumped by the pump 1 has a nozzle diameter of 0.5. It is ejected from each elliptic nozzle 3 having a diameter of ~ 1.5 mm and a minor axis of 0.2-0.6 mm, but the solenoid valve 8 is turned on.
When FF is set and the injection of the rolling lubricating liquid is completed, either one of the solenoid valves 13 or 14 is turned on, and water or steam is injected from each nozzle 3.

In the piping system shown in FIG. 2, a branch pipe 17 for passing steam is connected to a switching valve 18 provided in a main pipe 16 for passing the rolling lubricating liquid. It is designed to be ejected from each nozzle 19. In this device, the switching of the switching valve 18 switches between the rolling lubricating liquid and the steam.

[0010]

As described above, according to the present invention, when the injection of the target fluid is completed, the alternative fluid is switched to the alternative fluid so that the alternative fluid can be ejected without increasing the nozzle diameter. It is possible to prevent clogging of the nozzle.

[Brief description of drawings]

FIG. 1 is a diagram showing a supply line of a rolling lubricant, water, and steam.

FIG. 2 is a diagram showing another supply line.

[Explanation of symbols]

1 ... Pump 3, 19
... Nozzle 4, 16 ... Main pipe 5, 17
・ ・ ・ Branch pipe 7 ・ ・ ・ Branch pipe 8, 1
3, 14 ... Solenoid valve

Claims (3)

[Claims] 1. A nozzle is provided at the tip, a branch pipe for passing an alternative fluid is connected to a main pipe for passing a target fluid, and when the injection of the target fluid is stopped, switching to the alternative fluid is performed, A method for preventing clogging of a nozzle, characterized in that an alternative fluid is ejected after the ejection is stopped. 2. The method for preventing clogging of a nozzle according to claim 1, wherein the main pipe is provided with a solenoid valve, and the branch pipe is provided with a check valve and a solenoid valve. 3. The method for preventing clogging of a nozzle according to claim 1, wherein the main pipe and the branch pipe are connected to a switching valve.