【正文】 the positive and solutions. Due to the development of the microelectronics technology, appear the thyristor direct power supply dc speed control system of the workbench drag planer scheme. The traditional control system of gantry planer has the shortings in reliability, maintenance, processing of quality and efficiency of production. PLC (programmable controller) is the microputer technology as the core of general industry control device. It will be the traditional relay a contact device control technology and even machine technology and munication technology, have powerful fusion, the environment, good adaptability to process simple, in high reliability, simple programming, small volume, low power consumption advantages. In just a few decades got rapid development, has bee the mainstay of the contemporary industrial automation of one. At present, the part of the small and mediumsized enterprises and universities still widely used the traditional relay control machine tools, the machine tool experienced short history, although it can be in a certain range to meet the needs of the single and automatic production line, but because of its electronic control system is based on relays, contact device hard links as the foundation, the technology is relatively backward, especially the contacts the reliability of the product directly affect the quality and the production efficiency. Therefore, in recent decades, industrial automation, electromechanical integration, transform traditional industries, PLC to widely. Study, the mastery and application of PLC 安徽理工大學(xué)畢業(yè)設(shè)計(jì) III technology team in industrial automation level and improve the production efficiency has the very vital significance. KEYWORDS: longmen planer control, plc control, electric control, direct current speed regulating安徽理工大學(xué)畢業(yè)設(shè)計(jì) i 目錄 摘要 ...................................................................... I ABSTRACT................................................................. II 1 緒論 .................................................................... 1 課題的研究背景 .................................................... 1 課題的提出 ........................................................ 1 PLC 控制系統(tǒng)與電器控制系統(tǒng)的比較 ................................... 1 本文研究的意義 .................................................... 2 2 龍門刨床的概念與發(fā)展 .................................................... 4 機(jī)床簡介 .......................................................... 4 龍門刨床 的概念 .................................................... 4 龍門刨床的發(fā)展 .................................................... 5 3 B20xxA 型龍門刨床 ....................................................... 7 B20xxA 型龍門刨床的基本結(jié)構(gòu) ........................................ 7 B20xxA 型龍門刨床的工作過程 ........................................ 7 B20xxA 型龍門刨床加工工藝的特點(diǎn) .................................... 8 B20xxA 型龍門刨床對控制系統(tǒng)的 要求 .................................. 8 4 B20xxA 型龍門刨的電氣控制 .............................................. 10 直流發(fā)電拖動(dòng)系統(tǒng)組成 ............................................. 10 交流機(jī)組拖動(dòng)系統(tǒng)組成 ............................................. 10 各控制電路概述 ................................................... 10 主拖動(dòng)機(jī)組電動(dòng)機(jī) M1 控制電路 ................................. 10 橫梁控制電路 ................................................ 12 工作臺自動(dòng)循環(huán)控制電路 ...................................... 13 工作臺步進(jìn)、步退控制 ........................................ 14 刀架控制電路 ................................................ 14 5 可編程控制器 PLC 的組成及原理 ........................................... 15 可編程控制器 PLC 的概述 ........................................... 15 認(rèn)識可編程控制器 ............................................ 15 可編程控制器的特點(diǎn) .......................................... 16 可編程控制器的分類 .......................................... 16 可編程控制器的應(yīng)用領(lǐng)域 ...................................... 17 可編程控制器的基本結(jié)構(gòu) ........................................... 17 安徽理工大學(xué)畢業(yè)設(shè)計(jì) ii 中央處理器 .................................................. 19 存儲器 ...................................................... 19 輸入、輸出模塊 .............................................. 19 電源 ........................................................ 21 I/O 擴(kuò)展機(jī) .................................................. 21 編程器等相關(guān)設(shè)備 ............................................ 22 PLC 的軟件系統(tǒng) .............................................. 22 可編程控制器 PLC 的工作原理 ....................................... 22 6 調(diào)速系統(tǒng)的選 擇 ......................................................... 23 調(diào)速系統(tǒng)的選擇 ................................................... 23 無環(huán)流調(diào)速系統(tǒng)簡介 ................................................ 24 無環(huán)流可逆調(diào)速系統(tǒng)設(shè)計(jì) ........................................... 25 系統(tǒng)組成 .................................................... 25 邏輯無環(huán)流調(diào)速系統(tǒng)的原理圖 .................................. 25 邏輯無環(huán)流調(diào)速系統(tǒng)主電路 .................................... 28 晶閘管觸發(fā)電路 .............................................. 29 參數(shù)整定 ......................................................... 31 電流環(huán)設(shè)計(jì) .................................................. 31 轉(zhuǎn)速環(huán)的設(shè)計(jì) ................................................ 34 7 PLC 的選擇 ............................................................. 37 PLC 選擇的原則 .................................................... 37 西門子 S7200 PLC ................................................. 38 PLC 的選型 ........................................................ 39 8 基于 PLC 的 B20xxA 型龍門刨床控制系統(tǒng) .................................... 42 龍門刨床 PLC 控制系統(tǒng)構(gòu)成 .......................................... 42 輸入 /輸出分配表 .................................................. 42 PLC 控制接線圖 .................................................... 44 系 統(tǒng)控制程序設(shè)計(jì) ................................................. 44 PLC 程序設(shè)計(jì)方法簡介 ........................................ 45 PLC 控制梯形圖 ..................................