【摘要】：目前層疊式柔版印刷機控制系統(tǒng)主要有兩種控制方式,分別是PLC控制和繼電器控制。二者均是控制機械主軸,通過主軸和各色組軸之間齒輪咬合進行傳動,而這兩種控制方式所依據(jù)的齒輪傳動存在的機械磨損會導(dǎo)致整個印刷系統(tǒng)的精度降低、噪音大、同步性差、速度低等問題。如何解決系統(tǒng)中存在的此類問題是本課題研究的核心任務(wù)。本文以杭州項淮機械有限公司的層疊式柔版印刷機為研究對象,依據(jù)系統(tǒng)的工藝性能要求,對其控制系統(tǒng)進行了研究、改造和實施。本文首先對層疊式柔版印刷機的結(jié)構(gòu)、工藝流程、各環(huán)節(jié)的傳動方式進行了細致的分析研究。然后以此為基礎(chǔ),針對印刷精度不高和同步性差的問題,提出基于伺服電機擬合虛擬主軸(電子軸)傳動的層疊式柔版印刷機控制方法。張力控制是整個項目的技術(shù)難點,實時保持張力穩(wěn)定是精準印刷的關(guān)鍵。本文采用變比例PID控制算法,可實現(xiàn)張力的精準控制,同時在收卷時考慮到恒張力下卷徑變化對產(chǎn)品的擠壓,在收卷時采用錐度控制算法,隨著卷徑的變大收卷機構(gòu)的張力逐漸減小,以保證機器在穩(wěn)定運行時收卷機構(gòu)不會壓壞產(chǎn)品。在印刷色組的同步性控制環(huán)節(jié),通過調(diào)節(jié)各色組伺服電機與虛擬主軸之間速度的耦合比以補償由外部擾動引起的位置誤差,實現(xiàn)控制色組之間印刷的同步性。該方法不僅能夠提高系統(tǒng)的同步精度,同時能夠滿足系統(tǒng)的動態(tài)同步要求,通過調(diào)節(jié)套色誤差解決印刷技術(shù)上套印精度低的問題。最后,在實施上本控制系統(tǒng)采用德國Beckhoff的Systemmanger伺服控制系統(tǒng),控制器采用Beckhoff的工控機及TwinCAT控制平臺,通過EtherCAT的IP網(wǎng)絡(luò)協(xié)議,搭建了一個運動控制系統(tǒng)。通過系統(tǒng)調(diào)試和現(xiàn)場測試,以及性能分析,結(jié)果表明,本文設(shè)計的控制系統(tǒng)結(jié)構(gòu)簡單、擴展性強,而且大大減小了傳動誤差,提升了系統(tǒng)的響應(yīng)速度、同步性能和印刷精度,完全滿足系統(tǒng)工藝要求,使以往的缺陷得以很好的改善。
[Abstract]:At present, there are two main control modes in the control system of the laminated flexo printing press, namely, PLC control and relay control. Both of them control the mechanical spindle, which is driven by the gear bite between the spindle and the shafts of various colors, and the mechanical wear of the gear transmission based on these two control modes will result in the reduction of the accuracy and the noise of the whole printing system. Synchronization difference, low speed and other problems. How to solve such problems in the system is the core task of this research. In this paper, the control system of the cascade flexographic printing machine of Hangzhou Xianghuai Machinery Co., Ltd is studied, reformed and implemented according to the requirements of the system's technological performance. In this paper, the structure, technological process and transmission mode of laminated flexographic printing machine are analyzed and studied in detail. Then, aiming at the problems of low printing precision and poor synchronicity, a new control method of cascaded flexographic printing machine based on servo motor fitting virtual spindle (electronic shaft) transmission is proposed. Tension control is the technical difficulty of the whole project, and maintaining tension stability in real time is the key of precision printing. In this paper, the variable proportional PID control algorithm is used to control the tension accurately. At the same time, considering the constant tension under the rolling diameter change to the extrusion of the product, the taper control algorithm is used in the coiling process. The tension of the winder decreases gradually with the increase of the winding diameter, so as to ensure that the winder will not be crushed when the machine is running stably. In the synchronism control of printing color group, by adjusting the coupling ratio of speed between servo motor and virtual spindle of each color group to compensate the position error caused by external disturbance, the synchronism of printing between color groups can be realized by adjusting the coupling ratio of the speed between each color group servo motor and virtual spindle. This method can not only improve the synchronization accuracy of the system, but also meet the requirement of dynamic synchronization of the system. The problem of low accuracy of overprinter in printing technology can be solved by adjusting the color error. Finally, the Systemmanger servo control system of German Beckhoff is adopted in the implementation of the control system. The controller adopts the Beckhoff industrial control computer and TwinCAT control platform. Through the IP network protocol of EtherCAT, a motion control system is built. Through system debugging, field testing and performance analysis, the results show that the control system designed in this paper is simple in structure, strong in expansibility, and greatly reduces the transmission error, and improves the response speed, synchronization performance and printing accuracy of the system. Fully meet the system process requirements, so that the previous defects can be well improved.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TP273;TS873

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