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Trouble Diagnosis and Elimination of Pipe Jacking Machine
- Categories:Technical Services
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- Time of issue:2020-09-29 16:30
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(Summary description)1.Noactionofthecorrectionsystem AΦ1800mmmuddywaterpressurizedpipejackingmachine(canbeexpandedto2000mm),thetotallengthoftherotaryexcavatorsystemis4705mm,thecutterheadtorqueis354kN·m,thecutterheadspeedis2.3r/min,andthedrivingpoweris30×3kW.Thestrokeofthecorrectionhydrauliccylinderis85mm,andthethrustofthecorrectionhydrauliccylinderis980kN×thetotalmassofthemainengine(t).Whenthepipejackingmachinewas200mawayfromthepipe,thecorrectionsystemfailedandthecorrectionactioncouldnotbegenerated,makingtheconstructionimpossible. Thecorrectionsystemoftherotaryexcavationsystemofthepipejackingmachineadoptsanelectro-hydraulicintegratedoperatingsystem,whichconsistsofahydraulicoiltank,anoilfilter,anoilfilterscreen,anelectricmotor,ahydraulicpump,aone-wayvalve,anoverflowvalve,apressuregauge,andasolenoidComposedofreversingvalve,hydrauliclock,overloadreliefvalve,mudwatertankelectromagneticreversingvalve,mudwatertankdoorreliefvalve,correctionhydrauliccylinderandothercomponents. Thehydraulicpumptransmitsthehydraulicoiltothecontrolvalve,andtransmitsittothecorrectionhydrauliccylinderaccordingtotherequiredcorrectionconditions.However,becausetheworkingpressureofthecorrectionhydrauliccylindercannotreachtherequired20MPa(only16MPa),thesystempressureislow.Thecorrectinghydrauliccylindercannotperformnormalcorrectingoperations. Thereasonsforthelowpressureofthecorrectionhydraulicsystemareasfollows:theoverflowvalvefails;theelectromagneticreversingvalveisseverelywornandcausesinternalleakage;thecorrectionhydrauliccylinderisleaked;theoilinletfilterisblocked;thepowerofthehydraulicpumpisreduced. Accordingtotheanalysisresults,adjustingthepressureoftheoverflowvalvehasnoobviouseffect;usingthetranspositionmethodtoreplacetheoverflowvalveofthesametypeinotherpartsfordebugginghasnoeffect,indicatingthattheoverflowvalveisgood.Checktheelectromagneticreversingvalve.Nooilleakage,loosevalvecoreanduncleargearsarefound,indicatingthattheelectromagneticreversingvalveisalsogood.Thepressuretestofthecorrectionhydrauliccylinderwascarriedout,thepressurewasnormal,andnointernalleakagewasfound.Theoilinletfilterwasremovedforinspection,andnoblockagewasfound.Finally,itisjudgedthatthepowerdropofthehydraulicpumpisthemaincauseofthefailure. Stopthecorrectionhydraulicsystem,cutoffthepowersupply,removethehydraulicpumpfromtheoiltank,replacethehydraulicpumpofthesamemodel,andrunthetestmachine.Thesystempressurecanreach26MPa,andthecorrectionworkisworkingnormally. 2.Thecorrectionsystemcannotcorrecttotheleft AΦ2000mmearthpressurebalancepipejackingmachine,afteroverhaulingtheelectricaloperation,hydraulicpressureandsoildumpingsystems,duringtheomni-directionaladjustmentandtestmachineprocess,itwasfoundthatthecorrectionsystemoftherotaryexcavationsystemdidnotmovetotheleft,andtheotherdirectionswerenormal. First,usethetranspositionmethodtotranspositiontheelectromagneticdirectionalvalveontheleftandright,buttheresultisthattheleftsidecannotbecorrected.Thentheleftandrighthydrauliccylindersaretransposedanddebugged,andtheleftsidestillcannotbecorrected.Throughtheabovetranspositiondebugging,itshowsthatthehydrauliccircuitofthecorrectionsystemisgood.Whencontinuingtheinvestigation,thefrontswingpartandtherearfollowerpartoftherotaryexcavationsystemweredisassembledandseparated,anditwasfoundthatthepipelinewaterproofrubberringatthejunctionofthefrontsteelshellandtherearsteelshellwasaginganddeformed,whichaffectedtheleftwardmovementofthecorrectionsystem. Theaginganddeformedpipewaterproofrubberringatthejunctionofthefrontsteelshellandtherearsteelshellwasreplaced.Afterthetestmachine,thecorrectionsystemmovedtotheleftnormally. 3.Failureofthereversingvalveofthehydraulicpumpstation Intheconstructionofsewagepipelines,afterthehydraulicpumpstationofthepipejackingmachineworkedcontinuouslyfor1h,thereversingvalvecouldnotbechangedsmoothlyasrequired,sometimesgoodandsometimesbad. Thehydrauliccircuitofthishydraulicpumpstationisrelativelysimple.Itusesthe4WE16G/EW220solenoiddirectionalvalve.After1hofoperation,thesolenoidvalveheatsupandcannotchangedirectionnormally. Removethesolenoiddirectionalvalve,surveyandmapthesolenoiddirectionalvalvebase,andfindamanualdirectionalvalvemodel4WMM16G50accordingtothesizeofthebase,anditworksnormallyafterinstallation. 4.Mudentersintothereducerboxofthespiralsoilconveyor AΦ3000mmearthpressurebalancepipejackingmachineundertakestheconstructiontaskofjackingΦ3000mmsteelpipeswithatotallengthof1km.Whentherotaryexcavationsystemwasdiggingto800m,itwasfoundthattherewasmudinthereducerboxofthespiralsoilconveyor. Therearetworeasonsforthisfailure:oneisthatthesealingringofthescrewshaftjournalisseverelywornandthejournalisnotwellsealed,whichcausessoiltoenterthereducerboxfromthescrewshaftjournal;theotheristhattheearthpressureofthespiralsoilconveyorisgreaterthanThepressureinthereducerboxcausessoiltoenterthereducerbox.However,thesealingringofthescrewshaftjournalisanewpartthatisreplacedbeforeconstructionandwillnotwearsoquickly.Therefore,theearthpressureisgreaterthanthepressureinthereducerboxasthemainreasonforthefailure.Itisunderstoodt
Trouble Diagnosis and Elimination of Pipe Jacking Machine
(Summary description)1.Noactionofthecorrectionsystem AΦ1800mmmuddywaterpressurizedpipejackingmachine(canbeexpandedto2000mm),thetotallengthoftherotaryexcavatorsystemis4705mm,thecutterheadtorqueis354kN·m,thecutterheadspeedis2.3r/min,andthedrivingpoweris30×3kW.Thestrokeofthecorrectionhydrauliccylinderis85mm,andthethrustofthecorrectionhydrauliccylinderis980kN×thetotalmassofthemainengine(t).Whenthepipejackingmachinewas200mawayfromthepipe,thecorrectionsystemfailedandthecorrectionactioncouldnotbegenerated,makingtheconstructionimpossible. Thecorrectionsystemoftherotaryexcavationsystemofthepipejackingmachineadoptsanelectro-hydraulicintegratedoperatingsystem,whichconsistsofahydraulicoiltank,anoilfilter,anoilfilterscreen,anelectricmotor,ahydraulicpump,aone-wayvalve,anoverflowvalve,apressuregauge,andasolenoidComposedofreversingvalve,hydrauliclock,overloadreliefvalve,mudwatertankelectromagneticreversingvalve,mudwatertankdoorreliefvalve,correctionhydrauliccylinderandothercomponents. Thehydraulicpumptransmitsthehydraulicoiltothecontrolvalve,andtransmitsittothecorrectionhydrauliccylinderaccordingtotherequiredcorrectionconditions.However,becausetheworkingpressureofthecorrectionhydrauliccylindercannotreachtherequired20MPa(only16MPa),thesystempressureislow.Thecorrectinghydrauliccylindercannotperformnormalcorrectingoperations. Thereasonsforthelowpressureofthecorrectionhydraulicsystemareasfollows:theoverflowvalvefails;theelectromagneticreversingvalveisseverelywornandcausesinternalleakage;thecorrectionhydrauliccylinderisleaked;theoilinletfilterisblocked;thepowerofthehydraulicpumpisreduced. Accordingtotheanalysisresults,adjustingthepressureoftheoverflowvalvehasnoobviouseffect;usingthetranspositionmethodtoreplacetheoverflowvalveofthesametypeinotherpartsfordebugginghasnoeffect,indicatingthattheoverflowvalveisgood.Checktheelectromagneticreversingvalve.Nooilleakage,loosevalvecoreanduncleargearsarefound,indicatingthattheelectromagneticreversingvalveisalsogood.Thepressuretestofthecorrectionhydrauliccylinderwascarriedout,thepressurewasnormal,andnointernalleakagewasfound.Theoilinletfilterwasremovedforinspection,andnoblockagewasfound.Finally,itisjudgedthatthepowerdropofthehydraulicpumpisthemaincauseofthefailure. Stopthecorrectionhydraulicsystem,cutoffthepowersupply,removethehydraulicpumpfromtheoiltank,replacethehydraulicpumpofthesamemodel,andrunthetestmachine.Thesystempressurecanreach26MPa,andthecorrectionworkisworkingnormally. 2.Thecorrectionsystemcannotcorrecttotheleft AΦ2000mmearthpressurebalancepipejackingmachine,afteroverhaulingtheelectricaloperation,hydraulicpressureandsoildumpingsystems,duringtheomni-directionaladjustmentandtestmachineprocess,itwasfoundthatthecorrectionsystemoftherotaryexcavationsystemdidnotmovetotheleft,andtheotherdirectionswerenormal. First,usethetranspositionmethodtotranspositiontheelectromagneticdirectionalvalveontheleftandright,buttheresultisthattheleftsidecannotbecorrected.Thentheleftandrighthydrauliccylindersaretransposedanddebugged,andtheleftsidestillcannotbecorrected.Throughtheabovetranspositiondebugging,itshowsthatthehydrauliccircuitofthecorrectionsystemisgood.Whencontinuingtheinvestigation,thefrontswingpartandtherearfollowerpartoftherotaryexcavationsystemweredisassembledandseparated,anditwasfoundthatthepipelinewaterproofrubberringatthejunctionofthefrontsteelshellandtherearsteelshellwasaginganddeformed,whichaffectedtheleftwardmovementofthecorrectionsystem. Theaginganddeformedpipewaterproofrubberringatthejunctionofthefrontsteelshellandtherearsteelshellwasreplaced.Afterthetestmachine,thecorrectionsystemmovedtotheleftnormally. 3.Failureofthereversingvalveofthehydraulicpumpstation Intheconstructionofsewagepipelines,afterthehydraulicpumpstationofthepipejackingmachineworkedcontinuouslyfor1h,thereversingvalvecouldnotbechangedsmoothlyasrequired,sometimesgoodandsometimesbad. Thehydrauliccircuitofthishydraulicpumpstationisrelativelysimple.Itusesthe4WE16G/EW220solenoiddirectionalvalve.After1hofoperation,thesolenoidvalveheatsupandcannotchangedirectionnormally. Removethesolenoiddirectionalvalve,surveyandmapthesolenoiddirectionalvalvebase,andfindamanualdirectionalvalvemodel4WMM16G50accordingtothesizeofthebase,anditworksnormallyafterinstallation. 4.Mudentersintothereducerboxofthespiralsoilconveyor AΦ3000mmearthpressurebalancepipejackingmachineundertakestheconstructiontaskofjackingΦ3000mmsteelpipeswithatotallengthof1km.Whentherotaryexcavationsystemwasdiggingto800m,itwasfoundthattherewasmudinthereducerboxofthespiralsoilconveyor. Therearetworeasonsforthisfailure:oneisthatthesealingringofthescrewshaftjournalisseverelywornandthejournalisnotwellsealed,whichcausessoiltoenterthereducerboxfromthescrewshaftjournal;theotheristhattheearthpressureofthespiralsoilconveyorisgreaterthanThepressureinthereducerboxcausessoiltoenterthereducerbox.However,thesealingringofthescrewshaftjournalisanewpartthatisreplacedbeforeconstructionandwillnotwearsoquickly.Therefore,theearthpressureisgreaterthanthepressureinthereducerboxasthemainreasonforthefailure.Itisunderstoodt
- Categories:Technical Services
- Author:
- Origin:
- Time of issue:2020-09-29 16:30
- Views:
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