Feasibility analysis report on servo energy-saving transformation of injection molding machine

In the energy-saving transformation of the servo system of injection molding machine, the servo motor+gear pump (screw pump) is usually used to replace the common motor+quantitative pump system.

Energy-saving principle: the injection molding process is generally divided into several stages: mold locking, glue injection, sol, pressure holding, cooling and mold opening, and the pressure and flow required in each stage are different. The traditional oil pump motor determines the power according to the highest pressure and equipment requirements, provides a constant flow at a constant speed, and the excess hydraulic oil flows back through the overflow valve, thus wasting a lot of energy.

The servo can output the maximum pressure in the stages of mode locking, pressure maintaining and cooling, but the maintaining speed is close to zero, so the power consumption is minimum. When low-speed glue shooting is needed, for example, the social speed is 30% of the highest speed, which can save energy by about 70%. The original servo motor is a high-efficiency rare earth permanent magnet synchronous motor, and the traditional oil pump motor is a three-phase asynchronous motor. Due to the low efficiency and power factor of three-phase asynchronous motor, the efficiency of servo motor is higher than that of traditional oil pump motor 10% under the average working condition of injection molding machine.

Due to the existence of high pressure throttling in traditional injection molding machines, the oil temperature rises rapidly, which will lead to problems such as thinning of oil body, softening of pipeline and oil leakage, so it is necessary to forcibly cool the hydraulic oil, which also requires considerable power consumption. After using servo, the natural cooling of hydraulic oil is sufficient in most working conditions.

Product features:

High energy saving: Ten thousand times speed regulation ratio makes the injection molding machine energy saving as high as 80%, and the lowest energy saving is 50% compared with variable displacement pump.

1. saves the energy wasted by high pressure throttling in the traditional technology;

2. Overall improvement of motor efficiency;

3. The consumption of hydraulic cooling system is saved.

High response: high speed brings high efficiency and high response, which improves the efficiency of injection molding machine by as much as 25%. The explosive force is strong, and the acceleration time of 1500 rpm only takes 15 milliseconds.

Energy saving effect

1, energy saving: the servo motor saves energy by 50%-80% compared with the quantitative pump, and the case is as high as 91.7%; Compared with variable pump, the minimum energy saving commitment of servo motor is 25%.

2. The number of qualified products per unit time increases by more than 10%;

3. Reduce raw materials by more than 8%.

Dongguan Laipule specializes in energy-saving transformation of injection molding machines, so you can learn more about it.