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Common Faults and Treatment of Temperature Control of Box Type Resistance Furnace

The following are common failure phenomena, causes and measures to be taken for box-type resistance furnace temperature controllers.

Phenomenon 1: heating up too slowly or not reaching the maximum working temperature
box furnace

the reason:

  1. The grid voltage is too low;

  2. The unbalanced value of three-phase current exceeds 20%;

  3. The electric heating element is open circuit or lack of phase;

  4. The resistance value of the electric heating element does not meet the requirements;

  5. The power of the electric heating element is reduced;

  6. There is a short circuit phenomenon in the electric heating element;

  7. Too much furnace charge;

  8. The performance of heat shield or furnace lining deteriorates, and the heat dissipation is too large;

  9. The connection method of the electric heating element is wrong;

  10. Low output voltage of furnace transformer;

  11. The output power of the power regulator is too small;

  12. The temperature control device fails;

Measures:

  1. Check the grid voltage;

  2. Measure whether the resistance values ​​of the three groups of heating elements are consistent;

  3. Check the fault point of the electric heating element;

  4. Measure whether the limits of the three groups of electric heating elements are within the allowable range;

  5. Replace electric heating elements;

  6. Eliminate short-circuit points;

  7. Reduce the loading amount;

  8. Replace the insulation layer, or reduce the heat dissipation, such as the cooling water flow is the most;

  9. Correctly connect electric heating elements;

  10. Check the furnace transformer;

  11. Check or adjust the power regulator;

  12. Troubleshoot the control device;

Phenomenon 2: Poor temperature uniformity

the reason:

  1. Unreasonable power distribution;

  2. The electric heating element is open;

  3. The unreasonable furnace structure leads to excessive local heat dissipation;

  4. Poor sealing of the furnace and excessive local heat dissipation;

  5. The gas circulation of the furnace with fan is uneven or the wind is insufficient;

  6. The thermocouple installation position or insertion depth cannot reflect the true temperature;

  7. The distribution of electric heating elements is unreasonable;

  8. The bottom temperature of the furnace is low;

  9. The heating power supply lacks phase and the fuse is broken;

Measures:

  1. Recalculate and improve the power configuration;

  2. Replace the broken electric heating element;

  3. Improve the furnace structure or improve the cooling method;

  4. Check the furnace sealing and eliminate the bad sealing factors;

  5. Place the workpiece reasonably to increase the wind power of the fan;

  6. Reasonably choose the installation position or insertion depth of the thermocouple;

  7. Adjust the distribution of electric heating elements;

  8. Increase the heating power of the furnace bottom;

  9. Check the heating power circuit;

Phenomenon 3: Poor sealing

the reason:

  1. The furnace cover sealing ring is aging;

  2. There is air leakage in the furnace body;

  3. Poor sealing of vacuum pipelines and valves;

  4. Poor sealing at the electrode;

  5. Poor sealing of thermocouple insertion manhole;

  6. The vacuum gauge is not well sealed at the inserting place;

  7. The spare hole is poorly sealed;

Measures:

  1. Replace the furnace cover sealing ring;

  2. Check the furnace body and eliminate leaks;

  3. Check the sealing condition of the vacuum system;

  4. Gongxin cleans and installs electrodes;

  5. Reinstall the thermocouple;

  6. Check and reinstall the vacuum gauge;

  7. Check the seal of the spare hole;

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