The reasons why mold heating tubes are prone to burning out are multifaceted. The following is a detailed analysis of this issue:
1、 Quality issues with heating elements
Material quality differences: The quality of heating tubes on the market varies greatly, and the quality of heating wires, magnesium powder, and other materials used in mold temperature machines also varies greatly. If the design of the heating tube is unreasonable or the material quality is not up to standard, it is easy to cause the heating tube to burn out during use.
2、 Dry burning phenomenon of heating tube
Improper operation: During the use of the mold temperature machine, if the heater is turned on first and then the circulation pump is turned on, or if the circulation pump fails and the heat transfer medium cannot flow, the heating tube will work without heat transfer medium, that is, "dry burning". Dry burning can cause the surface temperature of the heating tube to be too high, thereby damaging the heating element.
Insufficient system pressure: When the fluid flow in the system is insufficient and the pressure is too low, if measures are not taken in a timely manner, it may also lead to dry burning of the heating tube.
3、 Overload operation
Excessive power: The power of ordinary mold heating tubes should not be too high. The normal surface load is around 5w/cm ². The greater the surface load of mold heating tubes beyond this standard, the shorter their lifespan. Because air has a hindering effect on heat conduction, if the internal temperature of the heating tube cannot dissipate heat, it will cause the surface temperature of the electric heating tube to rise, which in turn will cause the internal temperature of the heating tube to rise, and ultimately may burn out the resistance wire.
4、 Water quality or heat transfer medium issues
Water quality impact: For mold temperature machines that use water as a heat transfer medium, the quality of water directly affects the service life of the heating tubes. Scale adheres to the outer wall of the heating tube and the inner diameter of the pipeline for a long time. If not cleaned for a long time, it can cause the heating tube to burn out.
5、 Other human factors
Improper maintenance: Failure to pay attention to the daily maintenance of the mold temperature machine, such as timely cleaning of scale and irregular inspection of the working status of the circulating pump, may lead to the burning of the heating tube.
Improper operation: When turning off the mold temperature machine, if the surface temperature of the electric heating tube is still high and the power is suddenly turned off, it may also damage the heating tube due to thermal expansion and contraction.
In summary, the main reasons why mold heating tubes are prone to burning out include quality issues with heating elements, dry burning of heating tubes, overload operation, water quality or heat transfer medium problems, and other human factors. In order to extend the service life of the mold heating tube, reliable heating elements should be selected, operating procedures should be standardized, regular maintenance and inspection should be carried out, and attention should be paid to the management of water quality and heat transfer medium.
