| Anchor chains tension tester is the testing equipment of. It is the equipment that the manufacturer of the electric welding anchor chains must have possession. These days, the requirement of large and super standard anchor chains at domestic and oversea market is rising. For this reason, the manufacturer of the anchor chains is hope to develop anchor chain tensbn tester. Based on studies on current developments of the material testing machine control system, a new project about Electro-hydraulic Servo Control System of MLW-15000 Horizontal Anchor Chains Tension Tester is proposed.In order to solve the problems that large energy consumption, temperature variation, high, cost trouble maintenance in current electro-hydraulic servo control system for material testing machine, and solve the problems of low accuracy and stability in current electro-hydraulic proportional control system. As a large inertia, large elasticity and variable load control system, all the currently control systems is not fitting the anchor chains tension tester. So a new design scheme about double valve compensation feedback control system based on adaptive load is proposed. The system uses a high quality and low cost digital PC controller based on ISA bus as the controller of the anchor chains tension tester. The level of all performance indexes of the Electro-hydraulic Servo Control System of MLW-15000 Horizontal Anchor Chains Tension Tester has been exceeded the foreign advanced products.The thesis includes six chapters.Chapter 1 is an exordium. The current development of material testing machine is expounded. The basic component and application of material testing machine are introduced. Main characteristics and several typical design schemes of material testing machine are analyzed. At last part of the chapter, the research task of the overall thesis is proposed.In chapter 2, introducing the specialty of the anchor chains tension tester and the design scheme of the electro-hydraulic servo control system at first. And then electro-hydraulic control system and electronic controllerdesign method are presented in detail.In chapter 3, the mathematics model about electro-hydraulic servo control system of anchor chains tension tester is proposed. The digital simulation and theoretical analysis of load control system and position control system are discussed according to various load type.In chapter 4, the mathematics model about double valve compensation feedback is presented in detail. We have proved the control method is useful through researching and computer simulation.In Chapter 6, the experiments and results of the project are given. The results proved that the design scheme is successful and advanced.Chapter 8 is the final chapter of this thesis, and all the research contents are summarized, and a prospect about further studies is given. |
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