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Muffle furnace equipment cleaning

2. Muffle furnace equipment cleaning:
 
(1) The furnace tank is cleaned once a week during continuous production, and the cleaning of the furnace tank in intermittent production should be carried out immediately after the furnace is stopped.
 
(2) When the cleaning temperature of the furnace tank is 850 ~ 870 ℃, all the chassis should be taken out;
 
(3) When blowing in from the feed end of the furnace with a compressed air nozzle, the valve should not be opened too much, and it must be moved back and forth, left and right when blowing, to prevent local overheating;
 
(4) The gas burner should be cleaned once with kerosene before carburizing.
 
(5) After the chassis or fixture is quenched, it should be returned to the pre-cooling room to remove oil stains.
 
(6) If the exhaust gas pipe is found to be blocked (the pressure in the furnace suddenly increases), it should be cleaned up immediately. First open the waste gas valve that does not pass through the water seal, and then close the waste gas pipe valve that passes through the water seal. After cleaning, first open the valve of the waste gas pipe with water seal, and then close the waste gas valve without water seal.
 
Muffle furnace maintenance and precautions
 
1. When the muffle furnace is used for the first time or is used again after long-term deactivation, it must be oven-baked. The oven time should be four hours at room temperature of 200°C. 200°C to 600°C for four hours. When using, the maximum furnace temperature should not exceed the rated temperature, so as not to burn the electric heating element. It is forbidden to pour various liquids and easily soluble metals into the furnace. The muffle furnace is best to work below the maximum temperature of 50 °C, and the furnace wire has a longer life.
 
2. The muffle furnace and controller must work in a place where the relative humidity does not exceed 85%, and there is no conductive dust, explosive gas or corrosive gas. When the metal material with grease and the like needs to be heated, a large amount of volatile gas will affect and corrode the surface of the heating element, destroying it and shortening its life. Therefore, when heating, it should be prevented in time and sealed containers or appropriate openings should be excluded.
 
3. The muffle furnace controller should be limited to use within the ambient temperature range of 0-40 °C.
 
4. According to the technical requirements, regularly check whether the wiring of the electric furnace and the controller is in good condition, whether the pointer of the indicator is stuck and stagnant when moving, and use the potentiometer to calibrate the instrument due to magnetic steel, demagnetization, wire expansion and shrapnel. Error increase caused by fatigue, balance damage, etc.
 
5. Do not pull out the thermocouple suddenly at high temperature to prevent the jacket from bursting.
 

6. Always keep the furnace clean and remove oxides and the like in the furnace in time.

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