This week, most parts of the country ushered in a new round of cooling, with many places cooling down by more than 10 degrees. As a more precise processing equipment, lasers working or stored in an environment below 5 ℃ are prone to low temperatures so that the internal cooling structure and optics can not operate normally, and when the temperature comes to 0 ℃, it may cause deformation or rupture of the internal piping in the water-cooling system, resulting in equipment failure. Therefore, the key point of laser winter maintenance and protection is to prevent freezing and low temperature, then how to operate?
No.1 Anti-freezing measures
1. Normal use during the day, power saving at night without disconnecting the power, water cooler temperature set above 0 ℃;
2. Keep the working environment of the laser in the temperature range of 25±3℃ as much as possible to ensure that the laser is always in the best use environment;
3. antifreeze can be added in time to avoid rupture caused by freezing on the cold water pipe, resulting in coolant leakage. If the temperature is reduced to below 0℃, use antifreeze for all the cooling water;
4. keep the storage temperature of the laser and other equipment above 5°C as much as possible;
5. When the laser is not used for a long time or when the power is disconnected, empty the water in the water cooler and store the equipment in an environment above 5℃.
No.2 Drainage method of water cooler
Step 1: Before draining, turn off all the power, open the drain valve at the back of the water cooler, and drain the accumulated water in the water cooler;
Step 2: Remove the water inlet and outlet pipes at the back of the water cooler and mark them so that they can be reinstalled accurately;
Step 3: Unscrew the water chiller filter cartridge and empty the water accumulated in the filter cartridge;
Step 4: Use 0.2MPA (2KG) gas to one end of the water pipe to empty the water accumulated inside the laser.
Note: If you need to use the air gun to blow air drainage, you need to open all the interfaces (including the water filling port) in advance, use the air gun to blow in the gas from the water inlet, not from the water outlet, the pressure of the drainage gas should not be too high, otherwise it may damage the laser. Make sure all the water is drained thoroughly to avoid the residual liquid from freezing and damaging the water-cooled piping and devices.
No.3 Precautions for using antifreeze
1. Antifreeze should not be used for a long time as it will deteriorate if used for a long time. Therefore, after the weather warms up, make sure to discharge it, clean the pipeline and replace it with deionized water;
2. Different brands or different varieties of antifreeze can not be mixed with different brands of antifreeze with different chemical compositions, after mixing may occur after the chemical reaction, the loss of antifreeze effect as well as the reaction of the pollution residue;
3. Antifreeze brand and ratio is recommended to choose CLARIANT brand Antifrogen-N ethylene glycol-water type antifreeze.
No.4 Precautions for starting the machine in winter
1. Make sure that the laser equipment can be turned on and used when the room temperature is 5-35℃;
2. Check whether the water-cooled tube is frozen or not, the laser equipment can not be turned on under frozen condition;
3. If there is ice, please turn on the air conditioning or heating facilities, adjust the ambient temperature of the laser equipment to 5-35 ℃, and leave it for more than 4 hours, until the ice naturally melts before the next operation, do not take violence to remove the ice, so as not to damage the equipment hardware;
4. After confirming that the laser equipment is free of icing, you need to turn on the chiller for preheating first;
5. Wait until the chiller cycle temperature rises to the normal temperature (recommended temperature: 25 ± 3 ℃ or so), before you can turn on the laser;
6. after normal power on, the energy will be adjusted to 30% or less, empty playing light preheating about 10 minutes, and then normal production operations.
