Pressure detecting apparatus of injection molding machine

摘要

A pressure detecting apparatus of an injection molding machine is utilized for always keeping an accurate zero adjustment point and accurately and precisely detecting pressure without being influenced by temperature drift. The pressure detecting apparatus includes pressure sensors for detecting the oil pressures of hydraulic cylinders such as injection cylinders. Correction value computing sections are provided for obtaining detected pressure values according to the outputs of the pressure sensors in a period in which the oil pressures theoretically become zero as correction values. Correction value storing sections are provided for storing the obtained correction values. Pressure correcting sections are provided for correcting the detected pressure values by the correction values according to the outputs of the pressure sensors at a time of pressure detection.