What are the common faults in the use of vacuum tube furnaces?

The common faults in the use of vacuum tube furnaces mainly include the following aspects:
1. Electrical malfunction
The indicator light is not on
Phenomenon: After all switches are turned on, the indicator light does not light up.
Reason: It may be that the fuse is broken.
Solution: Replace the fuse.
The ammeter has no current, while the voltmeter has voltage
Phenomenon: The ammeter does not display current, but the voltmeter displays voltage.
Reason: The heating element is damaged.
Solution: Open the door, observe which heating element is broken, and then replace the damaged element instead of replacing everything.
The electric furnace is not working
Phenomenon: The voltage and power supply are normal, but the vacuum atmosphere tube furnace is not working.
Reason: Incorrect parameters of the electric heating tube furnace or control system malfunction.
Solution: First, check if the parameter settings of the electric heating tube furnace are correct. If there are any errors, they need to be reset. If the parameters are correct, it may be a control system malfunction, and professional personnel should be contacted for inspection and maintenance.
2. Temperature control malfunction
The temperature does not rise but instead decreases
Phenomenon: When heating in a vacuum atmosphere tube furnace, the temperature does not rise but instead decreases.
Reason: The positive and negative terminals of the thermocouple are reversed or the thermocouple is damaged.
Solution: First, check if the positive and negative connections of the thermocouple are correct. If they are reversed, swap the connections. If the wiring is correct, it may be a damaged thermocouple and a new thermocouple needs to be replaced.
Abnormal temperature
Phenomenon: High temperature alarm or display temperature not reaching the set value.
Reason: Incorrect temperature controller parameter settings, poor or damaged thermocouple contact, heating tube malfunction, etc.
Solution: First, check if the temperature controller parameter settings are correct. If there are any errors, they need to be reset. Then check if the thermocouple is in good contact, and replace it if it is loose or damaged. If all the above are normal, it may be a malfunction of the heating tube. It is necessary to check whether the heating tube is powered on and working. If there is a malfunction, it needs to be replaced.
3. Vacuum system malfunction
Insufficient vacuum degree
Phenomenon: The vacuum gauge shows insufficient vacuum or cannot reach the set value.
Reason: Vacuum pump malfunction, vacuum system leakage, damaged vacuum gauge, etc.
Solution: First, check if the vacuum pump is working properly. If there is a malfunction, repair or replace it. Then check if the vacuum system is leaking. If there is any leakage, locate the leak point and seal it. If both the vacuum pump and the vacuum system are normal, it may be a damaged vacuum gauge and a new one needs to be replaced.
4. Mechanical structural failure
The door doesn’t close tightly
Phenomenon: The furnace door cannot be tightly closed or the seal is not tight enough.
Reason: Loose hinges, deformed buckles, damaged sealing strips, or deformed door panels.
Solution: Check if the hinges, buckles, and sealing strips of the door are intact, and replace them if damaged. At the same time, check whether the door panel is deformed. If there is any deformation, it needs to be repaired or replaced.
Fan abnormal noise
Phenomenon: The fan makes abnormal noises during operation.
Reason: Foreign objects have entered the fan or the screws fixing the motor are loose.
Solution: After stopping the machine, check if there are any foreign objects entering the fan and clean it up if necessary. At the same time, check whether the screws fixing the motor are loose, and tighten them if necessary.
In summary, common faults that vacuum tube furnaces may encounter during use include electrical faults, temperature control faults, vacuum system faults, and mechanical structure faults. For these faults, corresponding solutions need to be taken according to the specific situation for handling.