China is a big country in the Injection molding machine industry. The annual injection capacity of 80-90 million injection molding machines and the power of the servo drive of injection molding machines are generally relatively large. It is expected that the company's servo system business revenue is expected to double again in 2011. The development experience of China's inverters is even more twists and turns:
First, foreign brands monopolize the market. In the 1990s, China imported high-voltage inverters mainly for supporting key projects. At this time, domestic customers did not realize the energy-saving effect, and the products were sold at a higher price.
Second, domestic companies have discovered the high-voltage inverter market and sought technological breakthroughs, but faced two major problems: customer distrust and product instability. Although the price is lower than half of the foreign brands, domestic enterprises can only be small due to performance problems. Orders are obtained from customers.
Third, domestic enterprises have made breakthroughs. First of all, after accumulation, technology is no longer a problem. Reliability has already met customer requirements. Brands are gradually established. Foreign brands are generally lagging behind local enterprises in services, giving domestic enterprises good development opportunities. Domestic brands such as Dehuafu have become market leaders in one fell swoop.
Fourth, domestic enterprises are fully blossoming. When large-scale customers realize that foreign brands no longer monopolize the market, they will pay more attention to domestic enterprises, and the localization process will accelerate.
The development trend of frequency converter in China is: the exchange of drive, the high frequency of power converter, the digitalization, intelligence and network of control. Therefore, China needs to have more work in injection molding machine. And technology updates are indispensable!
For the plastics industry, electricity consumption is a major part of its production costs, and injection molding machines are one of the main energy-consuming equipment of plastic products factories: most of the current injection molding machines are hydraulic transmission injection molding machines, hydraulic transmission systems. The power is supplied by an electric motor driven oil pump. During the injection molding production cycle, the injection machine requires different flow rates and pressures in different processes. Flow valves and pressure valves must be used to regulate the flow and pressure required for different processes. The load on the hydraulic system varies greatly. Since the dosing pump cannot adjust the output power, the excess energy can only be consumed in the baffle, oil leakage, and oil temperature rise. Summary of the collection of plastics not only aggravates the wear of various valves, but also causes excessive oil temperature, excessive motor noise, and shortened mechanical life. And usually in the design, the capacity of the user's oil pump motor design is much higher than the actual needs, there is a phenomenon of 'large horse-drawn car', resulting in a large amount of waste of electrical energy. Therefore, the promotion of the application of the AC variable frequency speed control device on the injection molding machine is of great significance for reducing energy waste and reducing production costs.
The advantage of the inverter in the energy-saving transformation of the injection molding machine is that it is more powerful. When the injection molding machine is modified and the wiring is changed, the original computer control system of the injection molding machine and the oil circuit of the hydraulic transmission system and the Y-â–³ step-down operation of the motor are retained. The circuit is unchanged, and the frequency conversion energy-saving/power frequency operation conversion control mode is adopted to avoid the normal production caused by the failure: only the working procedure of the injection molding machine computer board needs to be changed when the mold is replaced, and no adjustment of the frequency converter is required.
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