The cleaning of pressure swing vacuum drying equipment can be divided into regular cleaning and cleaning at any time.

1. The cleaning operation at any time is to empty the residual resin in the final mixing tank and pouring pipe after each pouring, close all valves, and inject the curing agent mixture into the final mixing tank according to the feeding method of the final mixing tank. The dosage is about 20kg (limited to normal mixing. The more the amount, the better the cleaning effect). Vacuum, stir for 20min, open the discharge valve, and open and close the discharge valve several times during the outflow of curing agent to clean the valve. Then, open the pouring valve, and the operation is the same as before. The cured agent after cleaning can be used as the castable of the cushion block or poured into the degassing tank for degassing. If this material is used as the next pouring material according to the operating procedures, these curing agents will be exposed to the air for most of the time during cleaning, and a large amount of air will be mixed in the material. In the mixing tank, the degassing effect is poor, and finally there will be a lot of air in the pouring material, which will have an adverse impact on the pouring.

2. Regular cleaning is divided into long-term cleaning and short-term cleaning. Long term cleaning is to thoroughly clean the equipment within a long period of time, including the cleaning of pipes, the interior of each tank and each valve. This cleaning can generally be carried out once a year. The specific operation is to clean about 500L solvent (banana water, acetone, N-methylpyrrolidone and other organic solvents) from the batching tank according to the batching, degassing, final mixing and pouring process. The time can be slightly longer than normal operation to ensure thorough cleaning.

Short term cleaning mainly refers to the cleaning of final mixing tank, pouring pipeline and pouring valve. Even if the final mixing tank, pouring pipe and valve are carefully cleaned after each pouring, it is inevitable that a small amount of final mixing material is stuck in it. Over time, it will cause problems such as ineffective valve opening and closing, pipe blockage, tank wall adhesion, damage to mixer blades, affect the heating speed in the tank, and block the sensor probe. If there is a lifting mechanism in the final mixing tank, it will affect the lifting efficiency. In case of serious, stick to the mixer. Therefore, the equipment shall be cleaned once a month or a quarter. The main content is to remove the pouring valve, heat and soak it in solvent, and scrape off the sticking deposit. Remove the pouring pipe, heat it to 120 ~ 140 ℃, and let the viscous deposit flow out. If the solidified substance blocks the metal pipe, it can be baked on the fire to make the blockage be discharged after combustion. After opening the final mixing tank for heating, scrape off the wall debris, remove the vacuum sensor probe, and clean the filter screen with solvent.