Common faults and solutions of vacuum ceramic sintering furnace

Vacuum ceramic sintering furnaces may encounter various faults during use. Here are some common faults and their solutions:

1. Abnormal temperature
Fault phenomenon: High temperature alarm or display temperature not reaching the set value.
resolvent:
Check if the parameters of the temperature controller in the workspace are normal, and refer to other temperature controllers in normal use to calibrate all parameters. If the resistance between the two output points of the solid-state relay is broken down, it must be replaced with a new one of the same model.
When powered on, gently shake the thermocouple probe in the corresponding working area by hand to check if the corresponding temperature controller displays a large jumping amplitude. If this phenomenon occurs, it indicates that the thermocouple probe has poor contact and needs to be replaced with a new one.
If there are no issues with the thermostat and thermocouple, it is necessary to test whether the heating tube is working properly when powered on. After turning on the power, start the heating. According to the circuit diagram, directly use a test pen to test the wires connected to the heating tube in the corresponding work area to see if there is electricity reaching.
If there is no electricity, the circuit must be checked one by one according to the circuit diagram to see where the electricity is cut off and whether any components are burned out.

2. Insufficient vacuum degree
Fault phenomenon: The vacuum degree cannot reach the set value or the vacuum degree drops too quickly.
resolvent:
Confirm whether the vacuum gas source is normal (above -95KPa) and whether the compressed air pressure is normal (normal operating range is 0.4~0.6 MPa).
Check if the vacuum gauge is intact, compare it with a vacuum gauge in normal use, and check if the parameters are normal.
Check if the furnace door is tightly closed, if the sealing film at the door is damaged or deformed, and if there are any foreign objects on the door panel.
If there is no problem with the door, it is necessary to check the positions of pipelines, pneumatic valves, thermocouple entrances, etc. in the corresponding work area. Usually, there are many problems at the inlet of the thermocouple. If the thermocouple is replaced, it may damage the vacuum sealing performance and require re sealing with AB glue.

3. Abnormal cooling water
Fault symptoms: Insufficient cooling water flow, high water temperature, or cooling water leakage.
resolvent:
When there is an abnormality in the cooling water, emergency measures should be taken immediately to maintain the vacuum state, confirm the cooling of the equipment, and stop the equipment operation while ensuring the water volume. If there are no emergency measures, maintain the original state.
If the cooling water stops at high temperatures, the water-cooled electrodes, heat exchangers, vacuum chamber shells, and pumps may all be damaged. Therefore, the stability and reliability of the cooling water system should be ensured.

4. Mechanical structural failure
Fault symptoms: furnace door cannot be closed, fan makes abnormal noise, pneumatic valve cannot operate, etc.
resolvent:
For the situation where the furnace door cannot be closed, check whether the hinges of the door are loose, whether the buckle is deformed, whether the sealing strip at the door is damaged, and whether the door panel is deformed.
If there is any abnormal noise from the fan, please carefully check if any foreign objects have entered the fan’s impeller or if the screws fixing the motor are loose.
When the pneumatic valve cannot operate, first check whether the corresponding solenoid valve can work normally and whether the compressed air pressure meets the working requirements. If the air pressure is normal and the solenoid valve is in good condition, it may be that the pneumatic valve itself is damaged and needs to be replaced.

5. Power failure
Fault phenomenon: The power supply cannot start or the power indicator light does not light up.
resolvent:
Check if the power circuit is connected correctly and if there are any open or short circuits.
Check if the power switch is damaged or has poor contact.
If there is an alarm indication in the power system, troubleshooting should be carried out according to the alarm code.

6. Other faults
If the system leaks, it may be caused by uneven distribution of items in the heating chamber or poor sealing. The system should be checked for leaks and ensure even air pressure; At the same time, check whether the vacuum seal is tight. You can use encrypted sealing glue or newly printed connectors for sealing.
When solving faults in vacuum ceramic sintering furnaces, the following principles should be followed:

Firstly, ensure personnel safety and avoid accidents during troubleshooting and maintenance processes.
Secondly, conduct a thorough investigation based on the symptoms and possible causes of the malfunction to ensure that the root cause of the problem is identified.
Finally, take the correct maintenance measures to repair and test whether the equipment has returned to normal working condition.

In addition, regular maintenance and upkeep of the vacuum ceramic sintering furnace is also an important measure to prevent malfunctions from occurring. This includes checking the wear and tear of various components of the equipment, cleaning the interior and exterior of the equipment, replacing damaged parts, etc. Regular maintenance and upkeep can extend the service life of equipment and improve its reliability.