A vertical injection molding machine is a production tool that is widely used in industry. The machine used in my country's plastics industry is composed of two types of oil circuits using proportional valve control technology and on-off valve control technology.
Power saving analysis of vertical injection molding machine:
The hydraulic drive equipment represented by the vertical injection molding machine has almost zero loads during the cooling and discharging process, and the cooling and discharging time accounts for 30-60% of the whole cycle. According to previous work experience, in injection molding machines, the energy loss caused by cooling and discharge overflow is as high as 30-65%. The power consumption of the injection molding oil pump motor accounts for 60-75% of the power consumption of the entire equipment, which has the potential to save energy.
The hydraulic power part uses the hydraulic system of an ordinary three-phase asynchronous motor + quantitative pump. The product forming process is generally divided into several stages, such as clamping, injection, melting, pressure holding, cooling, mold opening, and discharging;
The characteristics of the oil circuit are controlled by the proportional valve in the vertical injection molding machine:
After the operation of the oil pump motor, it runs at full speed and high load, and then sets the pressure and flow required for each stage of work through the proportional valve. In a production cycle of the injection molding machine, only the high-pressure mold clamping and glue melting stages have a large motor load, and other work The motor load is generally small in the stage, and the oil pump motor in other stages provides a constant flow at a constant speed, and the excess hydraulic oil flows back through the relief valve, resulting in unnecessary waste.
The characteristics of the oil circuit are controlled by the on-off valve of the vertical injection molding machine:
The power of the oil pump motor is equipped according to the large load during its operation. After the oil pump motor is running, the pressure and flow are not set. , In the oil circuit, the corresponding directional switch valve is opened, the full flow works, and the relief valve is closed. During cooling and discharging, the directional switch valve at each stage is closed, the overflow valve is opened, and all return flows, resulting in waste.
Choose our servo energy-saving injection molding machine, you can save more electricity.