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The Study and Implement of Control System of Large Hydraulic Press

Author: ZhangJingChao
Tutor: LiNan
School: Lanzhou University of Technology
Course: Mechanical Manufacturing and Automation
Keywords: Large forging hydraulic press Pump direct drive PLC control SIMULINK simulation
CLC: TP273
Type: Master's thesis
Year: 2010
Downloads: 138
Quote: 1
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Abstract


An increasing role in forging occupies a pivotal position in the industrial production is one of the mechanical manufacturing process, along with the rapid development of the steel, automobile, chemical, electric power, aerospace and other industries, forged in the national economy and national defense and security the more important. Large forgings production capacity and quality is an important indicator of measuring a country's level of industrial development. Countries in the world, both developed and developing countries have attached great importance to the development of forging hydraulic press. With the rapid development of economic construction, especially the needs of the defense industry and the development of heavy industry, large-scale or even very large open die forgings market demand growing, large, very large free forging equipment demand is very urgent. This paper studies the pump control hydraulic system under the control of the PLC. Adjust the pump output flow changes with an approximation to a sine curve, in order to achieve the entire hydraulic machine status is approximate sine curve is mainly reflected in the the moving beam velocity change paper first introduces the electro-hydraulic servo system, and power the characteristics and requirements of the hydraulic servo system and its development. After the electro-hydraulic servo system in the hydraulic system are described, and the entire press electrical control system, electrical control several types. Second, the operating characteristics of forging hydraulic press. After that, we introduced two common type of control of the hydraulic system - pump direct drive control and pump - accumulator drive control. Of these two control modes are analyzed and compared in terms of energy saving. In this paper, the hydraulic system, according to the the rigidity parameters required of the hydraulic system, we chose Panke's high-pressure radial piston pump as the main control pump, and we analyze the performance. Piston pump dynamic performance analysis and mathematical modeling and simulation, we have come in the closed-loop servo system under the control of the output flow curve are approximate sine curve. Followed by the introduction of the press working order, we calculate its required maximum flow rate under different conditions. In the last chapter, we first hydraulic just mathematical modeling, based on the modeling and analysis of the previous chapter, we have come to a control block diagram of the entire hydraulic system. Thereafter, based hydraulic system required for the various electrical components and electrical control system PLC, the corresponding module and the sensor selection. And a description of the working status of the various electrical components in the hydraulic system in the course of their work. Finally, for this article summary and outlook. Deficiencies in the course of the study, and since there are problems to be solved.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Automatic control,automatic control system
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