Gas pressure maintaining and adjusting device, and microstructure optical fiber and preparation method thereof

A gas pressure maintaining and adjusting device, comprising:

• a communication control module,
• a programmable logic controller (PLC),
• a pressure controller,
• an electromagnetic valve, and
• a gas pressure threshold display screen,
• wherein:
• the communication control module is electrically connected with a main console of an optical fiber drawing tower;
• a signal output end of the communication control module is connected with a signal receiving end of the PLC;
• the PLC is provided with the gas pressure threshold display screen;
• the signal receiving end of the PLC is further connected with a signal output end of the pressure controller;
• the PLC is further connected with the electromagnetic valve used for controlling opening and closing of a gas inlet and a gas outlet;
• the communication control module is used for receiving a communication signal instruction of the main console of the optical fiber drawing tower and transmitting the communication signal instruction to the PLC;
• the pressure controller is used for detecting a pressure in real time and transmitting the pressure to the PLC;
• and
• the PLC is used for displaying a gas pressure threshold transmitted by a communication module through the gas pressure threshold display screen, and comparing the gas pressure threshold with the pressure detected by the pressure controller, thereby transmitting signals to control opening and closing of the electromagnetic valve.