对节能组合油缸液压升降系统研究

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1、机床与液压Sep．2014HydromechatronicsEngineeringVoI．42No．18DOI：10．3969／j．issn．1001-3881．2014．18．012Studyonenergy·savingcompositecylinderhydraulicliftingsystemLu-junZHANG．Zhi-jiangLIN。SchoolofElectromechanicalAutomobileEngineering，YantaiUniversity，Yantai264005，China；。KeyLaboratoryofAdvancedMan

2、ufacturingandControlTechnologyinUniversitiesofShandong，Yantai264005，China；WendengAgriculturalMachineryServiceStation，Wendeng264400，ChinaAbstract：Theconstructionmachines，suchasthecrane，hydraulicgrabandetc．，utilizethehy·draulicliftingsystem．Theconventionalhydraulicliftingsystemusuallycan

3、notrecoverthepoten—tialenergyoftheheavyobject．Inordertoavoidtheobjectfallingtoofast，athrottlevalveissetintheoilcircuittoIimitthefallingvelocityoftheobject．Therefore．thepotentialenergywillbeconveaedintothethermalenergy，whichnotonlybringstheenergylossandalsocouldcausesomethermalproblems．

4、Inordertoavoidthelossofenergy，anenergy-savingcompositecylin-derhydraulicliftingsystemisdesigned．Thispaperpresentsthebasicstructureandworkingtheo-ryofthisnewhydraulicliftingsystem．Byutilizingcompositecylinderwithspecialstructurecom-binedwithaccumulator．thissystemcanIimittheloweringveloc

5、ityofheavyobjectandalsocouldrecoverthepotentialenergyoftheobjectbeinglowered．Thus，thissystemhasremarkableefectofenergy—saving．Theparametersoftheaccumulatorusedinthissystemaredetermined．Themathematicalmodelofliftingconditionisproposed，andthesimulationanalysisofliftingconditionisconducte

6、daswel1．Keywords：Compositecylinder，Accumulator，Energy-saving，Hydraulicliftingsystem，PotentialenergYrecoverywillbereleased．Theconventionalhydrauliclifting1．Introductionsystemcannotrecoverthiskindofpotentialenergy．Inordertoavoidtheobjectfallingtoofast，athrottleLotsofengineeringconstructi

7、onmachines，suchvalveisusuallyadoptedintheoilcircuittolimittheasthecrane，hydraulicgrab，hydraulicelevatorandfallingvelocity．Therefore，thepotentialenergywillhydraulicpumpingunits，havethehydraulicliftingbeconvertedintothethermalenergy，whichwillnotsystem[1-4]．Thehydraulicliftingsystemlift