First domestic injection molding machine servo regenerative energy technology

Donghua Machinery Co., Ltd. (a member company of Datong Machinery Co., Ltd.) has successfully developed a breakthrough servo motor regenerative energy technology for injection molding machines, which is also a patented technology pioneered by the domestic injection molding machine industry. At the Shanghai CHINAPLAS exhibition in April of this year, the company successfully exhibited a Se injection molding machine with a “servo hydraulically actuated brake energy recycling device”, which has received intense attention from users and experts.

Injection molding machine hydraulic system is vigorously developing to energy saving. Injection molding machine hydraulic system control started from the asynchronous motor driven quantitative pump originally applied, experienced the intermediate development stage of the variable pump/electronic variable pump, and has now transitioned to the batch-use servo-driven hydraulic system.

Servo drive hydraulic system pressure, flow value is under certain conditions to adjust the servo permanent magnet motor speed, closed-loop pressure and flow, no excess pressure flow overflow, there is a relatively high efficiency, but the servo permanent magnet motor in the braking and deceleration process In the brake resistor, heat (conversion of heat energy into electrical energy) consumes excess energy. In this process, on the one hand, the braking resistor heats up and consumes electric energy. On the other hand, in order to ensure the temperature of the servo box, it is necessary to increase the heat dissipation of the electric fan and consume system power, resulting in double waste.

Donghua Machinery Co., Ltd. injection molding machine regenerative energy technology is a successful example of cross-industry (elevators and cars), research and development to connect the energy regeneration unit to the DC bus of the servo control device. Through practical applications, savings of 3%-5% can be universally reflected on medium-sized machines. At the beginning of this year, the National Patent Office accepted two patent applications related to design and invention of Donghua Machinery.