【正文】 緒論 ............................................................................................................1第 2 章 國產(chǎn)破碎機(jī)的背景 ..........................................................................................2 國產(chǎn)破碎機(jī)的發(fā)展 ............................................................................................2 國產(chǎn)破碎機(jī)所存在的問題 ................................................................................2 破碎機(jī)的發(fā)展趨勢(shì) ............................................................................................3 實(shí)現(xiàn)自動(dòng)化 ........................................................................................................3第 3 章 可編程控制器 PLC 原理及選型 ...................................................................5 PLC 發(fā)展歷程 ...................................................................................................5 PLC 的應(yīng)用現(xiàn)狀 ...............................................................................................5 PLC 控制系統(tǒng)的發(fā)展前景 ...............................................................................6 可編程序控制器 PLC 的分類 .............................................................................6 PLC 的選型方法 ..................................................................................................8 PLC 電源的選擇 ............................................................................................8 輸入輸出（I/O）點(diǎn)數(shù)的估算 ......................................................................9 輸入輸出模塊的選擇 ...................................................................................9 存儲(chǔ)器容量的估算 ......................................................................................9 存儲(chǔ)器的選擇 ...............................................................................................9第 4 章 西門子 STEP7 軟件介紹 ...............................................................................10 西門子 STEP7 的概述 .......................................................................................10 STEP7 的構(gòu)成組件 ............................................................................................10 STEP7 各程序塊的功能 ....................................................................................11第 5 章 MM440 變頻器 ..........................................................................................14 MM440 通用型變頻器概述 ..............................................................................14 MM440 變頻器的安裝與接線 ..........................................................................14 MM440 變頻器開關(guān)量輸入功能 ......................................................................15 MM440 變頻器的多段速選擇功能 ..................................................................16 MM440 變頻器的停車跟制動(dòng) ..........................................................................17第 6 章 對(duì)輥式破碎機(jī)的硬件設(shè)計(jì) ..........................................................................18 對(duì)輥式破碎機(jī)簡介 .............................................................................................18 對(duì)輥式破碎機(jī)的主要結(jié)構(gòu) ................................................................................18目錄VII 對(duì)輥式破碎機(jī)的控制要求 ................................................................................18 對(duì)輥式破碎機(jī)的控制過程 ................................................................................19 對(duì)輥式破碎機(jī)的控制模式 .........................................................................19 PLC 現(xiàn)場(chǎng)控制箱的指示按鈕 ......................................................................19 對(duì)輥式破碎機(jī)的控制原理圖 .....................................................................19 硬件選擇說明 .....................................................................................................23 主電路電動(dòng)機(jī)選擇 .....................................................................................23 油泵電機(jī)選擇 .............................................................................................23 電流互感器選擇 .........................................................................................24 電流變送器選擇 .........................................................................................24 斷路器選擇 ..................................................................................................24 熱過載繼電器選擇 .....................................................................................25 中間繼電器選擇 .........................................................................................25 變頻器的選擇 .............................................................................................25 PLC 硬件選擇 ....................................................................................................25 PLC 電源選擇 ..............................................................................................25 CPU 選擇 .....................................................................................................26 數(shù)字量輸入模塊選擇與接線 .....................................................................26 數(shù)字量輸出模塊選擇與接線 ......................................................................26 模擬量輸入模塊選擇與接線 ......................................................................27第 7 章 對(duì)輥式破碎機(jī)控制系統(tǒng)軟件設(shè)計(jì) ..............................................................29 對(duì)輥式破碎機(jī)控制系統(tǒng)的程序流程 ................................................................29 I/O 符號(hào)表 .......................................................................................................30 編輯系統(tǒng)程序 .....................................................................................................32 創(chuàng)建新項(xiàng)目 ..................................................................................................32 設(shè)計(jì) PLC 硬件組態(tài) ....................................................................................35 編輯符號(hào)表 ..................................................................................................36 編寫系統(tǒng)的程序 ..........................................................................................37 對(duì)輥式破碎機(jī)控制系統(tǒng)的程序梯形圖 ............................................................38結(jié)論 ..