Investigation on the Main Technology for Measuring Moisture in Molding Sand
The principles and characteristics of three main technologies for measuring moisture of molding sand were discussed and some novel designing ideas and measuring system are proposed in order to overcome the limitation of traditional measuring methods.Through the transformation from resistance measurement to frequency period measurement,the resistance measuring method can overcome the limit of measuring range and the quality of signal remote transmission.By using an ultra frequency capacitance method,the measuring range can be enlarged to fit well the scope of molding sand moisture content.The measuring moisture content in molding sand based on both microwave energy attenuation and microwave phase shift can be realized with high accuracy and without the interruption of the sand density change,and the temperature compensation and nonlinear measurement can be implemented by using intelligent data process such as artificial neural network algorithm.The three modified methods can realize on-line measurement with high precision.