InternationalJournalofMechanicsandApplications2012,2(6):98-102DOI:10.5923/j.mechanics.20120206.01StudyofInherentSafetyMinehoistbasedonmoderndesignmethodsSaeedAsiriKingAbdulazizUniversity,21589,Jeddah,P.O.Box.80204,SaudiArabiaAbstractAsamodernsecuritydesign,InherentSafetymeansthatequipmentandfacilitiesisableto contain the inherent fundamental features to prevent accidents. Mine hoist is the most importantequipmentinthecoalproduction.Howtoachievesafe,reliable,efficientproductionhasbeenthefocusstudy at home and abroad. Inherent safety is reflected in hoist design, primarily through the designmeasurestoimprovetheoperationofhoistsafetyandreliability.Inthispaper,InherentSafetytheoryisappliedinthedesignofminehoist,toproposedthedesignmethodbyusingthesoftwareofPRO/EPLC,Labviewetc.Keywords-Minehoist;InherentSafety;PRO/E;PLC;LabviewI.INTRODUCTIONIn coal production, mine hoist is the equipmentto carry coal, gangue, materials, workers andequipments along the rockshaft, the only waylinked underground and aboveground, known asmine throat. Mine hoist is a large-scalereciprocating machinery which has the feature ofown big inertia, load changes, running speed,andwide range et al. The advantages anddisadvantages of its operating performance, notonlydirectlyaffectthenormalproductionandcoalproductionefficiency,butalsorelatetoequipmentand personal safety. In recent years, mine hoistfailuresandaccidentshavehappenedathomeandabroad which have paid a heavy price to coalcompanies. Therefore, the production technologyand safety of mine hoist are higher, and itsmechanical manufacturing technology andelectricalcontroltechnologyhasbeenanimportantresearchareatotheinternationalmachinebuildingindustryandtheelectriccontrolindustry.Inherent Safety means that equipment andfacilities is able to contain the inherentfundamentalfeaturestopreventaccidents.InherentSafety lies in design, through continuousimprovement, to prevent accidents due to theequipment itself failures. Inherent safety isreflected in hoist design, primarily through thedesignmeasurestoimprove theoperationofhoistsafetyandreliability.Inthispaper,InherentSafetytheory is applied in the design of mine hoist, toproposedtheinherentsafetydesignmethodbyusethesoftwareofPRO/EPLC,Labviewetc.II.INHERENTSAFETYTHEORYThe term of inherent safety originates thedevelopmentofworldspacetechnologyintheInternationalJournalofMechanicsandApplications2012,2(6):98-102 991950s. The concept is widely accepted closelylinked with scientific technological progress andhuman understanding of safety culture. Theconcept of inherent safety produced after theWorldWarIIwhichbecamemajorsafetyconceptinmanyindustrializedcountriessincethemid20thcentury.Inherent safety design as the basic method ofhazardcontrol,byselectingsafematerials,processroutes, mechanical equipment, devices, toeliminate or control hazards source rather thanrelying on additional security measures ormanagement measures to control them. Asinherentsafety design,firstly analyze andidentifyhazardsthatmayoccurinsystem,andthenchoosethe best methods to eliminate, control hazards,whichreflectedinprojectdesign. THE DESIGN OF INHERENT SAFETYMINEHOISTMine hoist mainly includs the working device,control system, transmission system and drag,protection systems and other components. To theinherent safety mine hoist design, mainly themechanical system, control system and monitorsystemisthemajorparttoconsidered.A. In-depth investigations to find malfunctionTheconceptofinherentsafetyisrequiredsafetyallthetimeintheproductdesignprocess.Thatis,the equipment has little malfunction as much aspossibleduringtheoperationandhaslongnormaloperation cycle length. How can design inherentsafety equipment, the most important thing isunderstandingenoughtotheequipment,especiallyin work. After in-depth research, fullyunderstanding the situation, try the best to reduceoreliminatethefaultinthedesign.Afterin-depthunderstandingofresearch,designproduct.B. Mechanical SystemThe traditional method of product has longdesign cycle, high costs. However, the virtualprototype technology has the advantage in savingthe design cost, shortening the design circle, byusingthemethodofmodeling,simulationfirstandthen builds the physical prototype. Therefore, thevirtual design is the developing trends ofmechanical design. In mechanical system design,the application of virtual prototype is used todesignminehoist,notonlyspeededupthedesignprocess, also simulated a variety of conditions tothe virtual prototype to discover design faults, toimprove the design, to improve mine hoistperformance.Mine hoist mechanical system is composed ofspindle, roller, reducer, motor, brakes and othercomponents. In its design, virtual design softwarePRO / E is applied to establish hoist prototype,applicationofsimulationsoftwareADAMSisusedto simulate and optimize the design. SpecificprocessshowninFigure1:C. Control system designMine hoist control system includes start, run,brake,etc.,therequirementsincontrolsystemare:In normal hoist operation, participation in hoistspeed control, brake the hoist when reaching thedestination,knownastheservicebraking;Incaseofemergency,canquicklyslowdownasrequired, brake hoist, to prevent the expansion oftheaccident,thatis thesafetybraking; Participatein the hoist speed control when decelerati; Todouble-rollerhoist,shouldbrakethemovingrollerand fix roller respectively when regulating ropelength, replacement level and changing rope, sothat, moving roller would not move when spindlerotateswiththefixedroller.SaeedAsiri:StudyofInherentSafetyMinehoistbasedonmoderndesignmethods100Figure1.MechanicalsystemdesignMost of mine hoists in China (more than 70%)usethetraditionalelectriccontrolsystem(tkd-aasthe representative). Tkd control system iscomposed of relay logic circuits, large aircontactors, tachometer generator etc., which is atouchcontrolsystem.Afteryearsofdevelopment,tkd-a series of electric control system has formedits own characteristics, but its shortcomings areobvious. Its electrical circuit is too complicated,multi-line, causing hoist parking and accidentsoccurredduetoelectricalfault.Withthecomputerand digital technology, to form a digital hoistcontrol system of PLC has become possible. PLCcontrol system has high control precision,parameter stability, simple hardware structure,self-diagnostic capability and communicationnetworkingfunction.Mine hoist control system based on PLCtechnology structure shown in Figure 2, mainlyincluding the following components: the main plccontrol circuits, hoist route detection and displaycircuits, speed detection, and signal circuits. ThePLC of the main control circuits uses MitsubishiFX2N series in Japan which more domesticapplications.Figure2PLCelectriccontrolsystemD. Monitoring system designToensuresafeoperationofthehoist,exceptforselecting the reasonable operation designparameters, the use of advanced control system,should also monitor the technological parameterson regular, conscientiously do performance testworktomasterthehoistperformance,discoverthedefects in time, eliminate hidden danger, avoidunnecessarylosses.Inaddition,thehoistoperationstate can be improved to work in the bestconditionsbased on test data.Therefore,the hoistcould work safely, reliably, have high efficiency,andextenditsworklife.Virtualinstrumenttechnologyiscomputer-basedinstrumentation and measurement technology, isloaded some software and hardware on thecomputer with similar appearance andperformanceoftheactualindependentinstrument.Theuseroperatingthecomputer,likemanipulatinga especially conventional electronic devicesInternationalJournalofMechanicsandApplications2012,2(6):98-102 101designed theirs. The essence of virtual instrumenttechnology is that hardware softwarizedtechnology, take full advantage of the latestcomputertechnologytoimplementandexpandthefunctionsoftraditionalinstruments.LabVIEW (laboratory virtual instrumentengineering workbench) is a graphicalprogramming and development environment, alsoknown as G language. It is widely used byindustry, academia and research laboratories,accepted as the standard data acquisition andinstrument control software. LabVIEW not onlyprovides and complies with all the functions ofhardware and data acquisition cardscommunications of GPIB, VXI, RS-232 andRS-485 protocol, and built-in library functionssupportfor TCP / IP, ActiveX and othersoftwarestandards. The software for scientists andengineersisaprogramminglanguage,itprovidesasimple, intuitive graphical programming mode,saves a lot of development time, has completefunction,bestembodiedstyleofvirtualinstrument.In responseto thesecircumstances,developed amine hoist Integrate Performance MonitoringSystem based on virtual instrumentLabVIEW-based. Show in Figure 3. With signalconditioning and data acquisition card to receivesignalsfromsensors,thensentthereceivedsignaltothevirtualinstrumentsoftwareplatform,enablesthefollowingfeatures:（1） show speed, acceleration, braking time,displacement, oil pressure, delay time and otherrelevant parameters in digital, and display speed,acceleration,traction,displacementandhydrauliccurves.（2）Dynamically monitor the hydraulic oilpressure and oil pump running station, based onthese parameters to avoid important brakingsystemfailure.（3）Testbrakeairtraveltime,relaydelaytimeandothertimeparameters.（4）inquiry to the measured curve and hoistparameters;printatestreport.Figure3.DiagramoftestsystemThemonitoringsystem hascharacteristicssuch as compact, light weight, highprecision, testing convenient and flexible,feature-richsoftwareetc.thesystemcannotonly display automatically test results, butalsofinishmultiplefunctions,forexample,data transmission, analysis, processing,storage and report printing. The system ishigh precision, can easily monitor the hoistoperation state, to ensure the reliability ofhoistoperation.CONCLUSIONSIn this paper, used virtual design software todesignthehoistmechanicalsystem,PLCtodesigncontrol system, applied virtual instrumentsoftware-LABVIEW to design monitor system.Therefore, the mine hoist designed has goodmechanical properties and safe operation,monitoringeasy.REFERENCES1 PolasekPandMUTLAccelerationofgravityseparationprocess.Proc.FiltechEuropa-Int.Conf.onFiltrationandSeparationTec