項(xiàng)目4 任務(wù) 1 方向控制回路的安裝與調(diào)試

方向控制閥的認(rèn)知KnowledgeaboutDirectionalControlValve任務(wù)1Task1任務(wù)描述TaskDescription1在液壓系統(tǒng)中，換向回路的控制方式有很多，了解常用的換向回路中的核心元器件，并能夠畫出控制回路的電氣原理圖。以及分析在不同控制條件下，液壓缸是縮進(jìn)還是浮動(dòng)的狀態(tài)。Inahydraulicsystem,therearemanycontrolmeansforcommutationcircuits;theobjectivesoftaskaretounderstandthecorecomponentsandpartsofcommutationcircuits,andtodrawtheelectricalschematicdiagramsofcontrolcircuits.Thetaskfurtheranalyzeswherethehydrauliccylinderisretractingorfloatingunderdifferentcontrolconditions.換向回路CommutationCircuits2二位四通電磁換向閥換向回路。CommutationCircuitofTwo-positionFour-waySolenoidReversingValveFigure4-1-1(a)CommutationCircuitofTwo-positionFour-waySolenoidReversingValve(b)SchematicDiagramofElectricalControl1-Hydraulicpump2-Directoverflowvalve3-Two-positionfour-waysolenoidreversingvalve4-Double-actinghydrauliccylinderwithsinglepistonrod換向回路CommutationCircuits2當(dāng)換向閥3處于圖4-1-1（a）所示狀態(tài)時(shí)，液壓泵1壓力油經(jīng)換向閥3右位至液壓缸4左腔，液壓缸4活塞桿伸出。當(dāng)按下“SB7”按鈕，電磁鐵AD1得電，液壓泵1壓力240油經(jīng)換向閥3左位至液壓缸4右腔，液壓缸4活塞桿退回。Whenthereversingvalve3isunderthestateasshowninFigure4-1-1(a),thepressurefluidofhydraulicpump1movestotheleftchamberofhydrauliccylinder4viatherightpositionofreversingvalve3,andthepistonrodofhydrauliccylinder4extends.Afterpressedthe"SB7"button,theelectromagnetAD1isenergized,thepressurefluidofhydraulicpump1movestotherightchamberofhydrauliccylinder4viatheleftpositionofreversingvalve3,andthepistonrodofhydrauliccylinder4retracts.。換向回路CommutationCircuits2如圖4-1-2（a）所示，AD2得電，液壓泵1壓力油經(jīng)換向閥3右位至液壓缸4左腔，液壓缸4活塞桿伸出。當(dāng)AD2失電，AD1得電，換向閥3處于中位，液壓缸4停止運(yùn)動(dòng)。AD1得電，液壓泵1壓力油經(jīng)換向閥3左位至液壓缸4右腔，液壓缸4活塞桿退回。AsshowninFigure4-1-2(a),whenAD2isenergized,thepressurefluidofhydraulicpump1movestotheleftchamberofhydrauliccylinder4viatherightpositionofreversingvalve3,andthepistonrodofhydrauliccylinder4extends.WhenAD2isde-energized,AD1isenergized,thereversingvalve3isinneutralposition,andthehydrauliccylinder4stopsmoving.WhenAD1isenergized,thepressurefluidofhydraulicpump1movestotherightchamberofhydrauliccylinder4viatheleftpositionofreversingvalve3,andthepistonrodofhydrauliccylinder4retracts.三位四通電磁換向閥換向回路CommutationCircuitofThree-positionFour-waySolenoidReversingValve換向回路CommutationCircuits2Figure4-1-2(a)CommutationCircuitofThree-positionFour-waySolenoidReversingValve1-Hydraulicpump2-Directoverflowvalve3-Three-positionfour-waysolenoidreversingvalve4-Double-actinghydrauliccylinderwithsinglepistonrod任務(wù)實(shí)施Taskimplementation31通過網(wǎng)絡(luò)查詢圖4-1-2（a）中元件3的作用是什么？Querythroughnetworktofindoutwhatthefunctionofcomponent3inFigure4-1-2(a)is?2小組合作畫出圖4-1-2（a）的電氣控制原理圖。DrawtheelectricalcontrolschematicdiagramofFigure4-1-2(a)throughteamwork.3當(dāng)圖4-1-2（a）三位四通電磁換向閥換向回路中元件3不得電時(shí)，液壓缸處于鎖緊還是浮動(dòng)狀態(tài)？Whenthecomponent3ofthecommut