Mixer for mixing raw materials for powder metallurgy

摘要

The mixer comprises a tank (2), a kneading unit (3), a heat exchange unit (4) having a cooling unit for cooling the contents of the tank and a heating unit (41) to heat the contents of the tank at lower temperature (TINF) and a higher temperature (TSUP) stored for a particular blend, and a control unit for controlling the heat exchange unit. The heating unit exchange energy with a first circuit (8) for maintaining the temperature of mixing, external to the tank. The thermal inertia of the circuit is greater than that of the tank under full load of the mixture in a factor of greater than 2. The mixer comprises a tank (2), a kneading unit (3), a heat exchange unit (4) having a cooling unit for cooling the contents of the tank and a heating unit (41) to heat the contents of the tank at lower temperature (TINF) and a higher temperature (TSUP) stored for a particular blend, and a control unit for controlling the heat exchange unit. The heating unit exchange energy with a first circuit (8) for maintaining the temperature of mixing, external to the tank. The thermal inertia of the circuit is greater than that of the tank under full load of the mixture in a factor of greater than 2. The control unit is connected to a measurement unit and a storing unit for temperature settings depending on the type of material to be produced. The TINF and TSUP are stored, for the mixture corresponding to a given type of ceramic, in the storage unit. The control unit controls the heat exchange unit so as to enable heat exchange with the tank. The cooling unit exchange energy with a second circuit for maintaining the temperature of mixing external to the tank. The control unit controls a flow rate of heat exchange by a pump on the second circuit of the cooling unit when the cooling unit exchanges energy with the second circuit. The control unit controls a first controller performing an input or heat removal to the first circuit or a second controller performing removal or addition of heat to the second circuit. The measuring unit comprises a temperature sensor of a mixing shaft near the bottom of the tank. The tank is internally lined with an abrasion-resistant coating or diamond coating or coating of glazing. An independent claim is included for a method for kneading raw materials for powder metallurgy.