In the vacuum pretreatment equipment, firstly, the liquid crystal glass bottle that has been cleaned in the previous stage is put into a sealed cavity with a set temperature parameter, and the sealed cavity is evacuated to a set value, and then the interior of the cavity is heated and After reaching the set temperature for a period of time, fill with nitrogen. Repeatedly recharging and refilling the equipment chamber with nitrogen and repurifying heat to remove the harmful substances such as trace amounts of moisture in the glass box.
In order to realize the system function of the equipment, the control system adopts the control scheme of PLC, and automatically controls the heating, insulation, vacuum and nitrogen filling in the production process.
Each action in the control software is designed in strict accordance with the process flow sequence and has an interlocking function to ensure mutual restraint or timing relationships. The control panel adopts a man-machine interface to display and observe the process flow in real time. The operator changes the setting parameters at any time on the display panel.
Heating the inside of the equipment chamber under vacuum is a very important part of the entire production process. Vacuum heating can evaporate and volatilize the residual moisture and fine impurities in the glass box, thereby increasing the production yield rate of the following liquid crystal filling section.
The cavity of the device is heated in a vacuum environment. Since there is no air flow under the vacuum state, the heat does not flow as air, so the heat is transferred by heating the radiation. Since there is no flowing air to conduct heat, the temperature uniformity inside the vacuum chamber is very difficult to control, and the heating method and the flatness and cleanliness of the chamber wall are important factors that directly affect the temperature uniformity.
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