The VFD (Variable-frequency Drive) market plays an important role in Chinese injection molding machine industry
The current competitive landscape of the VFD (Variable-frequency Drive) and servo machine industries is dominated by foreign capital, and both occupy about 80% of the market share. From the perspective of the general trend, the best industrial automation manufacturers in China will definitely lead the overall share of domestic brands in the future. improvement. The low-voltage frequency conversion and servo industry will grow at a rate of 10% (slightly exceeding GDP) in the next 10 years, and the market size will be 41.7 billion yuan and 13.8 billion yuan respectively by 2020. Chinese domestic market needs a large number of plastic machinery and accessories Manufacturers are constantly developing and innovating. At present, Inovance Technology is the dominant company, which does not match the domestic competition environment in China.
China is a big country in the injection molding machine industry, with an increase of 80,000 to 90,000 injection molding machines every year, and the power of the servo drive of the injection molding machine is generally relatively large. It is expected that the company's servo system business revenue will still double in 2011. The development experience of VFD (Variable-frequency Drive) in China is even more tortuous:
First, foreign brands monopolize the market. In the 1990s, China imported high-voltage VFD (Variable-frequency Drive) as a supporting key project. At this time, domestic customers in China were not aware of the energy-saving effect, and the product price was relatively high.
Second, Chinese domestic companies have discovered the high-voltage frequency conversion market and are seeking technological breakthroughs, but they are faced with two major problems: customer distrust and product instability. Although the price is lower than half of foreign brands, due to performance problems, Chinese domestic companies can only Get orders from small customers.
Thirdly, Chinese domestic enterprises have made breakthroughs. First of all, through accumulation, technical problems are no longer difficult, reliability has met customer requirements, and brands are gradually established. Foreign brands generally lag behind local enterprises in terms of service, giving Chinese domestic enterprises good opportunities for development. , Lide Huafu and other Chinese domestic brands have become market leaders in one fell swoop.
Fourth, Chinese domestic enterprises are in full bloom. When large customers realize that foreign brands no longer monopolize the market, they turn more attention to Chinese domestic enterprises, and Chinese localization process accelerates.
The development trend of VFD (Variable-frequency Drive) in China is: the AC drive, the high frequency of the power converter, the digitalization, intelligence and networking of the control. Therefore, China wants to have a greater role in the injection molding machine. , VFD (Variable-frequency Drive) research and development and technology updates are indispensable!
For the plastic product industry, power consumption is the main part of its production cost, and injection molding machines are one of the main energy-consuming equipment in plastic product factories: most of the injection molding machines are hydraulic transmission injection molding machines at present, and the hydraulic transmission system The power is provided by the electric motor driving the oil pump. During the production cycle of injection molding, the flow rate and pressure required by the injection molding machine are different in different processes, and flow and pressure required by different processes must be adjusted by flow valves and pressure valves. The load of the hydraulic system varies greatly. Since the fixed displacement pump cannot adjust the output power, the excess energy can only be consumed in the baffle plate, oil leakage, and oil temperature rise. This 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 designed capacity of the user's oil pump motor is much higher than the actual need, and there is a phenomenon of "big horse and small cart", resulting in a lot of waste of electric energy. Therefore, it is of great significance to promote the application of AC frequency conversion speed control devices in injection molding machines for reducing energy waste and production costs.
The advantage of VFD (Variable-frequency Drive) in the energy-saving transformation of injection molding machines is that it is more powerful. When wiring the injection molding machine with frequency conversion transformation, the original computer control system of the injection molding machine and the oil circuit of the hydraulic transmission system and the Y of the motor are retained. △The step-down start-up operation circuit remains unchanged, and the frequency conversion energy-saving/power frequency operation conversion control method is adopted, which avoids affecting normal production in the event of a failure: when replacing the mold, it is only necessary to change the working program of the computer board of the injection molding machine, and there is no need to modify the VFD (Variable-frequency Drive) to make any adjustments.