Research On Energy-saving Hydraulic System Of Injection Molding Machinery Based On Energy Regulation Strategy

The hydraulic energy-saving technology of Injection Molding Machinery (IMM) was a new advancement during the progress of IMM technology. We knew the flow rate and pressure needed in each step of IMM were different. But most of the driven systems in regular IMM nationally were fixed displacement pump, so the power lose was comparatively high. Therefore the main subject of this research was to design an effective hydraulic configuration, which could self-adaptive adjustment the relation between output powers of driven system with implement agencies and to improve energy efficiency. This project would obtain important significance and good application prospects.Chapter 1 illustrated the basic components and structures of IMM, and normal injection molding processes were introduced also. Then research statuses and results in hydraulic energy-saving fields of IMM in and abroad were illustrated, and listed four typical energy-saving hydraulic system solutions and their respective advantages and disadvantages in details. As follows, the research backgrounds of this project, contents and procedures with analysis of research significance were described briefly.In chapter 2, four kinds of typical IMM hydraulic systems were analysized in detail. AMESim hydraulic simulation software was used to simulate and analysis the four typical systems. From the energy consumption, response speed, integrated performance, availability and other aspects of economic considerations, we analysised and compared the simulation results. Finally, we made the decision that the variable displacement pump with flow and pressure control valves, and added up with an energy regulation unit (ERU) was our research and development target.Chapter 3 described the system implementation schematic and its work principles under flow and pressure control circumstances respectively. Firstly AMESim hydraulic simulation software was adopted to set up the simulation models of entire swash plate axial piston variable displacement pump of internal structure and external hydraulic control components. The flow rate control and pressure control simulation results verified the correctness and feasibility of this design. Therefore we could build up the actual hydraulic and electrical experiment rigs accordance with the design. And then the key components in this system, which were variable displacement pump and proportional direction flow rate valve, were been tested according to their application requirements. The performances and key parameters of these components were obtained from steady states and dynamic responses tests. Experiment results were basically consistent with the simulation results, thence the correctness and fleability of this design were proved once again, which could meet the design goals of this system.Chapter 4 proposed the energy regulation control strategy, and the implementation of the system was described also. And physical simulation test platform was constructed as follows. In this chapter implementation processes of PLC software programs and calculation methods of integrated deployment of energy supply and demand were illustrated in detailed.The chapter 5 was the conclusions and prospects. The major research conclusions and results were summarized in this chapter, and proposed the future planning steps and research directions.