Negative pressure cleaning system for the cooler of the vacuum system of the auxiliary extruder of the film production line

Abstract

The invention relates to a negative-pressure cleaning system used for a cooler of an auxiliary extruder vacuum system of a film production line. The negative-pressure cleaning system comprises the cooler, a filter, a first liquid level tank, a pump and a second liquid level tank; a liquid discharge tube of the cooler is connected to the filter through a first solenoid valve; the filter is connected to the first liquid level tank through a second solenoid valve; the first liquid level tank is connected to an inlet of the pump through a pump-in solenoid valve; an outlet path I of the pump is connected to the second liquid level tank through a pump-out solenoid valve; another outlet path I of the pump is connected to a liquid spray hole in a flange end cover through a liquid spray solenoid valve and a liquid spray flow regulating valve in sequence; the second liquid level tank communicates with an inner cavity of a cooler main body through a communication solenoid valve; and an outlet path I of the second liquid level tank is connected to the filter through an overflow solenoid valve, and another outlet path II of the second liquid level tank is connected to a liquid dropping and filling hole in the flange end cover through a dropping and filling solenoid valve and a dropping and filling flow regulating valve. The negative-pressure cleaning system can keep the cooling working surface of the cooler to be relatively clean, can keep cooling efficiency to be relatively stable, and has a self-cleaning function, so that manual labor amount is reduced.

Description

technical field [0001] The invention relates to a film production line, in particular to a negative pressure cleaning system for the cooler of the vacuum system of the auxiliary extruder of the film production line. Background technique [0002] At present, the known PET film production line auxiliary extruder vacuum system is made up of vacuum cover, cooler, filter, Roots fan, oil-water separator, screw pump, connecting pipe and electromagnetic valve. At the working temperature of 270°C in the auxiliary extruder system, the ethylene terephthalate melt is volatilized, and the mixed gas with small molecules and water vapor as the main components is heated by the vacuum cover of the vacuum system through electric heating. The active insulation connection pipe to 250°C enters the cooler for cooling, and the cooled mixed gas enters the filter through the active insulation connection pipe and electromagnetic valve that is electrically heated to 180°C, and the cross-sectional area...

AI Technical Summary

Problems solved by technology

When cleaning the cooler, it is time-consuming and laborious. It takes 2-3 hours for a mechanic to clean a cooler. Even if four mechanic clean up four coolers at the same time, it will take 2-3 hours to complete the cleaning.

To clean the cooler of the vacuum system, the production line must be shut down. There are only four maintenance personnel in the day shift of the PET production line, which takes up a lot of maintenance manpower resources and takes a long time to clean up, which increases downtime and affects production efficiency.

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