回转及行走系统

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1、7.3.SwingsystemSH.SignallinetobrakereaslsePG.Pilotlineforbrakerelease7-357.3.1.Swingmotor1Innerring16Piston31O-ring2Oilseal17Cap32Backupring3Taperrollerbearing18O-ring33O-ring4Plug19Coneddiscspring34Cover5Backingspring20Teflonring35Reliefassembly6Camplate21Bushing36O-ring7Retu

2、rnplate22Balanceplate37Hexagonsocketbolt8Pistonassembly23Needlebearing38Check9Plate24Snapring39Spring10Liningplate25Cylinder40Cap11O-ring26Housing41Backupring12Piston27Collar42Timedelayvalve13O-ring28Levelgaugeassembly43Hexagonsocketbolt14Spring29Snapring15Parallelpin30Bypassv

3、alveassembly7-367.3.2.Swingportreliefvalve①Parts(P,R)attankpressure.②Whenhydraulicoilpressure(PxA1)reachesthepresetforce(Fsp)ofspring(4),theplunger(3)movestotherightasshown.P1xA1=Fsp+PgxA2Fsp+PgxA2P1=A1③Theoilflowstochambergviaorificemandn.Whenthepressureofchambergreachesthe

4、presetforce(Fsp)ofsprng(4),thepiston(6)movesleftandstopthepiston(6)histhebottomofbushing(7).④Whenpiston(6)hitstheboottomofbushing(7),itstopsmovingtotheleftAsaresult,thepressureinchamber(g)equals(Ps).PsxA1=Fsp+PsxA2FspPs=A1-A27-377.3.3.SwingBrake①Neutralposition:Brakeappliedbys

5、pringforce(9)1.Swingcontrollever7.Poppet2.Swingcontrolvalve(MCV)8.Spring3.Timedelayvalve9.Spring4.Shuttlevalve10.Orifice5.Spool11.Spring6.Piston12.Pilotpump②Operatedposition:Brakereleasedbypilotpressure(Pg)1.Swingcontrollever7.Poppet2.Swingcontrolvalve(MCV)8.Spring3.Timedelayv

6、alve9.Spring4.Shuttlevalve10.Orifice5.Spool11.Spring6.Piston12.Pilotpump7-387.3.4.Swingcircuit7.3.4.1.Neutralposition7-397.3.4.2.OperatedpositionExample:Swingisoperatedwithboomsimultaneously.-Swingspeedcontrolisusedforswingpriority.-Adjustingswitchatcontrolpannel(dialtype).Swi

7、ngspeedcontrolisonlyeffectivewithsimultaneousoperationofSwing+Arm,andSwing+Boom.BecauseopeningsizeofoilsupplyporttoboomandArmcircuitisregulatedbyswingpriorityvalve.7-40Swingcircuit:Swingisnotoperated.Swingspeedcontrolsystemisnoteffectivewhenswingisnotoperated,becauseoilissuppl

8、iedtoBoomorArmcircuitthroughswingspooldirectly.7-417.3.4.3.An