Electric heating pieces are often used for heating in metal. In daily life, they are used to quickly bake food and cook in electric rice cookers; in production, they are used to heat the bottom of drinking troughs and oil drums in livestock farms. , Flat vulcanizing machine and other rubber machinery and plastic equipment.
Electric heating film
1. There are three types of silica gel electric heating pads when used to heat metal:
1. The heating tube is directly cast or die-cast in the metal alloy;
2. The heating tube is heated in contact with the metal surface, for example, a flat heating tube is closely attached to the outer wall of a square or spherical metal container for heating;
3. Punch holes in molds, castings and industrial machinery and equipment to insert electric heating tubes into the holes to heat, such as bag-making electromechanical heating tubes.
2. Surface load and surface temperature of heating plate for common castings:
1. The surface load of the cast aluminum heating plate: 0.1～5w/cm2, the surface temperature is below 380℃, and the temperature of 400℃ or higher will cause the heating plate to deform and even melt;
2. Cast iron heating plate, cast aluminum heating plate surface load: 0.1～5w/cm2, the surface temperature is about 700℃;
3. The surface load of the cast aluminum heating plate: 0.1～5w/cm2, the surface temperature is about 600℃, and the temperature resistance is 800℃.
Electric heating film
3. The relationship between the surface load of the heating plate and the surface temperature:
The electric heating tube is cast in a copper alloy to make a cast copper heating plate. After different surface load tests, the following results are obtained:
1. Surface load: when 1w/cm2, surface temperature: about 200℃
2. Surface load: when 2w/cm2, surface temperature: about 330℃
3. Surface load: when 3w/cm2, surface temperature: about 415℃
4. Surface load: when 4w/cm2, surface temperature: about 485℃
5. Surface load: when 5w/cm2, surface temperature: about 550℃
In the test, when the surface temperature of the heating plate reaches 500 degrees, the thermal state inside the heating tube placed in the metal is equivalent to that of the heating element in the air.
Electric heating film
When the electric heating tube is heated in the metal, the heating film manufacturer reminds you that you need to know the following points:
1. Both sides of the metal plate are hot;
2. After power on, the electric heating plate cannot be placed in the air for dry burning and must be attached to the heated body;
3. Use temperature control. The surface temperature of the electric heating tube when it is heated in a metal depends on the maximum allowable working temperature of the material of the electric heating tube, which is determined by the maximum allowable working temperature of the metal plate alloy material.
