Treatment method of electric heater failure
1. If the heater fails to heat and the internal wire of the electric heating tube is broken and cannot be repaired, it can only be replaced. If the wire or joint is broken or loose, it can be reconnected.
2. If the electric heating tube is broken or broken, the only way to replace the electric heating tube.
3. If it is a leakage, it is necessary to confirm the leakage point, and consider it according to the situation. If it is the electric heating tube itself, it can be baked in an oven; if the insulation resistance does not go up, you may need to replace the electric heating tube; if the junction box enters water, use a hot air gun to dry; if the wire is broken, it can be wrapped or replaced with tape wire.
The heating speed control of the electric heater mainly depends on the structure of the heater. The frequency converter can only change the frequency of the alternating current, thereby changing the rotation speed of the motor and achieving the purpose of changing the output power of the motor. Then how to control the heating speed of the electric heater.
There are two methods:
1. Use diode half-wave rectification to change the effective value of alternating current to achieve the purpose of changing the heating power and heating speed. This method is the most widely used, and the advantage is that the circuit structure is simple and easy to operate.
2. Transformation, using a small transformer to transform the voltage, the advantage is that it can be adjusted in multiple stages, but the disadvantage is that the circuit structure is more complicated and the production cost is high.
The use time of the electric heating tube of the die-casting furnace is not long. Half of it is not caused by the quality of the electric heating tube itself, but also has a lot to do with our insufficient maintenance during use. Therefore, when the quality of the electric heating tube is good, we should find the cause of the failure after inspection. We should not judge the quality of the electric heating tube first, because once the electric heating tube is broken, it is not necessarily a quality problem, it may be accidentally broken during work.
1. What kind of pipe is made of ordinary 304 stainless steel or imported 304 stainless steel? To extend a bit: the thickness of the ordinary 304 pipe wall is not enough.
2. The staff should pay attention when cutting the material, and don't use too much force. In the die-casting furnace, the electric heating tube burns out and burns out to form the greatest impact on the quality of the material.
