【摘要】：在液壓系統(tǒng)中,多執(zhí)行器的同步控制是一個(gè)重要的研究課題。隨著現(xiàn)代科學(xué)技術(shù)的飛速發(fā)展,越來越多的工程機(jī)械、冶金機(jī)械、加工制造設(shè)備等對(duì)液壓同步系統(tǒng)的控制精度提出了更高的要求。電液數(shù)字控制技術(shù)作為液壓領(lǐng)域中的新型控制方式,它與現(xiàn)代控制理論相結(jié)合所形成的數(shù)字控制系統(tǒng),具有成本低、可靠性高、性能優(yōu)越等優(yōu)點(diǎn),將其應(yīng)用到液壓同步控制中,是提高液壓系統(tǒng)多執(zhí)行器同步精度的重要手段,也是液壓同步技術(shù)發(fā)展的重要趨勢(shì)。 本文以鉛電解殘陽極洗滌機(jī)作為研究對(duì)象,針對(duì)該設(shè)備使用比例閥控制液壓馬達(dá)的提升機(jī)構(gòu),在實(shí)際生產(chǎn)中所出現(xiàn)的問題,進(jìn)行了改進(jìn),即采用電液數(shù)字閥控制液壓缸的提升裝置來使鉛殘陽極板做升降運(yùn)動(dòng)；分析了改進(jìn)后洗滌機(jī)提升裝置的工作原理,并指出高精度的雙缸同步控制是保證機(jī)構(gòu)正常運(yùn)行的前提條件；根據(jù)改進(jìn)后提升裝置運(yùn)動(dòng)過程中的受力情況,設(shè)計(jì)完成了該提升裝置的電液數(shù)字同步控制系統(tǒng),選取了數(shù)字閥、液壓缸、液壓泵、位移傳感器等相應(yīng)的液壓元件,在控制方式上采用“主從式”的控制策略；最后建立了電液數(shù)字同步控制系統(tǒng)的數(shù)學(xué)模型,應(yīng)用MATLAB／Simulink仿真軟件對(duì)控制系統(tǒng)進(jìn)行仿真,在仿真的基礎(chǔ)上增加PID校正環(huán)節(jié),以進(jìn)一步提高了系統(tǒng)的同步性能,保證改進(jìn)后洗滌機(jī)提升裝置能更好的滿足實(shí)際生產(chǎn)需要。 研究結(jié)果表明,采用電液數(shù)字控制技術(shù)的液壓同步系統(tǒng),控制結(jié)構(gòu)簡(jiǎn)單,抗干擾性好,且數(shù)字閥能夠做到精密的流量調(diào)節(jié),從而不受液壓缸負(fù)載變化以及油路中不同液壓缸的制造精度誤差和泄漏誤差對(duì)系統(tǒng)同步性能的影響,使系統(tǒng)獲得較高的同步控制的精度。
[Abstract]:Synchronous control of multiple actuators is an important research subject in hydraulic system. With the rapid development of modern science and technology, more and more construction machinery, metallurgical machinery, processing and manufacturing equipment have put forward higher requirements for the control accuracy of hydraulic synchronous system. Electro-hydraulic digital control technology is a new control method in hydraulic field. The digital control system, which is formed by combining with modern control theory, has the advantages of low cost, high reliability, superior performance and so on. It is an important means to improve the synchronization accuracy of multiple actuators in hydraulic system, and also an important trend in the development of hydraulic synchronization technology. This paper takes the lead electrolytic residual anode washing machine as the research object, aiming at the problems in the actual production of the lifting mechanism of the hydraulic motor controlled by proportional valve. That is to say, the lifting device of hydraulic cylinder is controlled by electro-hydraulic digital valve to make lead residue anode plate move up and down. The working principle of the improved hoisting device of the washing machine is analyzed, and it is pointed out that the high precision double cylinder synchronous control is the precondition to ensure the normal operation of the mechanism. According to the mechanical condition of the improved lifting device, the electro-hydraulic digital synchronous control system is designed and completed, and the corresponding hydraulic components, such as digital valve, hydraulic cylinder, hydraulic pump, displacement sensor and so on, are selected. The "master-slave" control strategy is adopted in the control mode. Finally, the mathematical model of the electro-hydraulic digital synchronous control system is established, and the control system is simulated by using MATLAB/Simulink simulation software. On the basis of the simulation, the PID correction link is added to further improve the synchronization performance of the system. Ensure that the improved washing machine hoist can better meet the actual production needs. The research results show that the hydraulic synchronous system using electro-hydraulic digital control technology has simple control structure, good anti-interference, and the digital valve can achieve precise flow regulation. Therefore, it is not affected by the variation of hydraulic cylinder load and the error of manufacturing accuracy and leakage of different hydraulic cylinder in oil circuit on the synchronization performance of the system, so that the system can obtain higher precision of synchronization control.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH137

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