There are over 20,000 shoe manufacturing enterprises in China, and power rationing has severely impacted their normal production. Rising plastic costs have intensified competition in China's plastics manufacturing industry. Energy conservation is a crucial means for enterprises to increase efficiency, reduce costs, and enhance competitiveness. The working principle of a fully automatic disc-type plastic injection molding machine: 1) The fully automatic disc-type plastic injection molding machine (hereinafter referred to as the disc machine) is controlled by a single-chip microcomputer and PLC. The main and auxiliary machines are precisely controlled, simple to operate, and easy to maintain. 2) Comparison of the disc machine's appearance with traditional horizontal injection molding machines. ① Hydraulic motor: Both horizontal injection molding machines and disc machines use fixed-displacement pumps. During injection molding, the hydraulic pump pressure fluctuates frequently. The traditional method for maintaining low pressure is through proportional valve depressurization, while the electric motor runs at full speed at the power frequency, resulting in significant energy waste. ② Disc machine models: Single-color disc machines have only one main unit, similar to horizontal injection molding machines. A two-color injection molding machine consists of one main machine and one auxiliary machine. The auxiliary machine is responsible for injection, melting, upper mold, and lower mold actions. The main machine includes the actions of the auxiliary machine and adds a rotating disc action to achieve mold movement and positioning. A three-color injection molding machine consists of one main machine and two auxiliary machines. ③ Number of molds: Horizontal injection molding machines generally only have one set of molds in operation. When the production process changes, the mold needs to be replaced. Rotary injection molding machines generally have 18, 20, 24, or 30 sets of molds, depending on the model. According to the production process, the validity of the mold position is set through the control panel. The PLC or microcontroller executes the program calculation. When only a valid mold position is detected, the turntable begins to decelerate. When the positioning signal is reached, the turntable performs precise positioning. Otherwise, if no valid mold position is detected, the large turntable continues to rotate to the next valid mold position. Horizontal injection molding machines will execute the relevant actions whenever there is a mold locking or opening signal. [b][align=center]For more details, please click: Application of Vector Frequency Converters in Plastic Machinery[/align][/b]