Electrically driven injection molding system with dual-driving function and injection molding method using the system

An electrically-driven injection molding system with a dual-driving function, characterized in that it comprises an electric apparatus with a dual-driving function, a plasticizing unit, an injection unit, an injection carriage, a guide frame, and a base, wherein the electric apparatus with a dual-driving function is connected with the plasticizing unit and the injection unit, the guide frame is connected with the electric apparatus with a dual-driving function and the injection unit, and the electric apparatus with a dual-driving function, the plasticizing unit, the injection unit, the injection carriage, and the guide frame are installed on an integral base;

• and characterized in that,
• the plasticizing unit comprises a plasticizing screw;
• the injection unit comprises a ball screw;
• the electric apparatus with a dual-driving function includes
• a motor running in a single direction continuously during plasticizing and injection molding processes;
• a reduction box with an input shaft coupled to the motor and an output shaft being a spindle so that rotation of the spindle is driven by the motor;
• a carrier rod which supports a shank of the plasticizing screw and is coupled to an end of the ball screw;
• an electromagnetic clutch for plasticizing, which upon energization enables the plasticizing screw to be rotated by rotation of the spindle and synchronously driven to retreat by pressure of molten polymer at the plasticizing unit, thereby driving the carrier rod and the ball screw to retreat;
• and upon de-energization stops rotation and retreat of the plasticizing screw;
• and
• an electromagnetic clutch for injection, which upon energization enables the ball screw to advance by rotation of the spindle, thereby advancing the carrier rod and the plasticizing screw for injection.