The plastics industry is facing an opportunity of rapid development. However, in the composition of the cost of injection molding products, electricity costs account for a considerable proportion. According to the needs of the injection molding machine equipment technology, the traditional injection molding machine pump and motor consumes the power of the entire device. The proportion is as high as 80%-90%. With increasing attention to energy issues, energy conservation has become more and more important.
The process of injection molding machine is generally divided into mold clamping, mold clamping, plastic injection, pressure keeping, melt glue, cooling, loose mold, mold opening, and removal. Several stages require different pressures and flow rates. For the pump motor, the load during the injection process is always in a state of change. In the hydraulic system of the metering pump, the pump motor provides a constant flow at a constant speed, and excess hydraulic oil flows back through the overflow valve. This process is called high pressure. Throttling, according to statistics, the energy loss caused by high-pressure throttling is as high as 36%-68%.
The Advantages and Disadvantages of Installing the Electric Servo Energy Saver in ACI Injection Molding Machine
(1) There are several major advantages:
1) Energy saving
Servo system injection molding machine, system pressure, flow double closed loop, hydraulic system according to the actual needs of the flow and pressure to supply oil, to overcome the high energy consumption of ordinary quantitative pump system high pressure overflow, in the pre-plastic, mold, injection In the high flow rate working phase, the motor operates at the set speed, and the motor speed is reduced in the low-flow operation stage such as pressure keeping and cooling, and the actual energy consumption of the oil pump motor is reduced by 40% to 80%.
2) Rapid response and high production efficiency
The servo system responds quickly, the pressure rise time and the flow rise time are as fast as 30ms, which improves the response speed of the hydraulic system, reduces the action switching time, and speeds up the operation cycle of the whole machine; when the hydraulic system of the injection molding machine runs automatically, when there is a valve When turned on, the system pressure will drop instantly and the servo system can quickly replenish the oil within 30ms and restore the pressure to the set value.
3) Pressure stability
The servo system has strong adjustment capability. The pressure closed-loop control mode makes the system pressure very stable. The pressure fluctuation is less than ±0.5bar, which improves the molding quality of plastic products. The servo system can also run according to any pressure and flow curve set by the computer. The development of molding processes for various plastic products creates the conditions.
4) High repeatability and material saving
Servo system adopts closed-loop speed control, high accuracy of the shooting table movement position, high precision and consistency of the produced product; overcomes the change of speed and flow caused by the change of the voltage and frequency of the common induction motor quantitative pump system. The disadvantages of changing the yield of injection molded products.
5) Low oil temperature rise
Injection molding machine work from start to enter the steady state oil temperature rise 8 °C -10 °C, room temperature 35 °C without cooling water, the amount of cooler is also greatly reduced, extended the whole machine, especially hydraulic oil, hydraulic wearing parts (such as The life of the oil seal).
6) Low noise
The noise of the hydraulic system is within 65dB, improving the on-site environment for operating the machine.