How to judge the quality of the mold heating tube? The electric heating tube used in the mold is different from the electric heating tube commonly used in our lives. There are more special factors to consider for the mold electric heating tube. Here are some simple ways to judge the quality of the electric heating tube: The main confirmed parameters are the resistance value of the heating tube and the insulation resistance value of the heating wire. The following editor will introduce how to judge the quality of the heating tube and what kind of mold electric heating tube is good?
method:
1. Use a multimeter resistance file (R*1 or R*10 file) to measure the lead wire or lead rod of the electric heating tube. There are two wires or lead rods for single-phase or two-phase. Use the red and black test leads of the multimeter to test the lead wires. The resistance value R indicates that the value is within the range (R=U*U/P, U refers to the marked voltage value of the electric heating tube, P refers to the marked power value of the electric heating tube), which means that the electric heating wire of the electric heating tube is not short-circuited.
2. Use a megohmmeter (also called a shaker, insulation resistance meter) to measure the insulation resistance value of the lead wire of the electric heating tube or the lead rod and the tube of the electric heating tube (the ground wire of the electric heating tube is connected to the tube of the electric heating tube), such as The greater the indicated value of the megohmmeter, the better, indicating that the heating tube is well insulated, but the minimum value must not be less than 2M ohms, otherwise the leakage protection switch will trip and fail to work during use.
3. Check that the lead-out power cord is not damaged and the junction box is well sealed.
What kind of mold electric heating tube is good?
1. The mold electric heating tube should be determined according to the size of the mold aperture. For example, the mold hole diameter is 10mm, then the diameter of the mold electric heating tube can be 9.8mm.
2. The length of the mold electric heating tube is determined according to the length of the opening.
3. The tube material of the mold electric heating tube should be selected according to the working temperature of the mold. Because the mold temperature and the surface temperature of the mold electric heating tube have a conduction time difference;
(1) When the mold temperature is 150 degrees, the surface temperature of the mold electric heating tube may be about 300 degrees. At this time, the material of the mold electric heating tube should be stainless steel 304 with a temperature resistance of 300 degrees.
(2) When the mold temperature is 200 degrees, the surface temperature of the mold electric heating tube may be about 400 degrees. At this time, the material of the mold electric heating tube should be stainless steel 321 with a temperature resistance of 500 degrees.
(3) When the mold temperature is 450 degrees, the surface temperature of the mold electric heating tube may be 600 degrees. At this time, the tube material of the mold electric heating tube should be stainless steel 310S with a temperature resistance of 700 degrees.
Of course, the temperature difference of this heat conduction also depends on the number of heating tubes installed and the size of the mold. This depends on the specific size. How to judge the quality of mold heating tube and what kind of mold heating tube is good? The content is here, I hope this article can help everyone, if you need to buy, customize electric heating tube, heating tube, stainless steel heating tube, please contact our company. .