Because of cast aluminum Heating ring The heater has the advantages of long service life, good heat preservation performance, strong mechanical performance, corrosion resistance and magnetic field resistance. Therefore, cast aluminum heating ring is widely used in plastic machinery, mold, cable machinery, alloy die-casting machine, pipeline, chemical, rubber, petroleum and other equipment. The following describes the matters needing attention of the lower cast aluminum heating ring. 1. The working voltage shall not exceed 10% of the rated value; the relative humidity of the air shall not be greater than 95%, and there shall be no explosive and corrosive gases. 2. The wiring part shall be placed outside the heating layer and insulation layer, and the shell shall be effectively grounded; the contact with corrosive and explosive media and water shall be avoided; the lead wire shall be able to withstand the temperature and heating load of the wiring part for a long time, and excessive force shall be avoided when the wiring screws are tightened. 3. The metal casting heater should be placed in a dry place. If the insulation resistance is lower than 1m Ω due to long-term storage, it can be baked in the oven at 200 ℃ for 5-6 hours, and then it can return to normal. Or reduce the voltage, electrify and heat until the insulation resistance is restored. 4. The metal casting heater should be well positioned and fixed, and the effective heating area must be closely connected with the heat receiving body, and no empty burning is allowed. When dust or pollutants are found on the surface, they should be cleaned and reused in time to avoid affecting heat dissipation and shortening the service life. 5. The magnesia powder at the outlet end of the electric heating tube can avoid the penetration of pollutants and moisture in the place of use, so as to prevent the occurrence of leakage accidents.