Maintenance and care of injection molding machine - Temperature control

Temperature Control A thermocouple is used as a temperature measuring element, and a millivolt meter is used as a temperature control device to direct the on-off of the barrel and die heating coil current to selectively fix the temperature and mold of the barrel. 
The barrel electric heating ring is generally divided into two sections, three sections or four sections of control. The ammeter on the electrical cabinet shows the size of each segment of the electric heating coil. The reading of the ammeter is relatively fixed. If the ammeter reading is found to be low for a long time during operation, there may be a failure of the electric heating ring, or poor contact of the wire, or oxidation of the heating wire, or burning of an electric heating ring. Both will increase the resistance of the circuit in parallel and cause the current to drop. 
When the ammeter has a certain reading, it is also easy to use a plastic strip to wipe the outer wall of the heating coil one by one to see if the strip is melted or not to judge whether a certain electric circle is energized or burned.