车辆制动装置VehicleBrakingDevice05课.pptx

车辆制动装置VehicleBrakingDevice任务六120型控制阀MISSION6120CONTROLVALVEZHENGZHOURAILWAYVOCATIONALTECHNICALCOLLEGE主讲人李西安SpeakerLiXi’an

常用制动位ServiceBrakeApplicationPosition（四）司机施行制动管常用制动减压，制动管的减压速度远远大于副风缸向制动管的逆流速度，副风缸压缩空气来不及向制动管逆流，主活塞两侧形成了一定的压力差，此压力差能克服主活塞、节制阀的自重及移动阻力、稳定弹簧的阻力时，主活塞先带动节制阀上移，然后带动滑阀上移，先后产生第一、第二阶段局部减压和常用制动作用。Whenthetrainisdeceleratingorpreparingtostopatastation,thedriverappliesthebrakepipe’saservicebrakeapplicationreduction.Thereductionspeedofthebrakepipeismuchgreaterthanthereverseflowspeedofthecompressedairfromtheauxiliaryreservoirthroughthef1,l4orificeandthel1orificeoftheslidevalveseattowardsthebrakepipe.Thecompressedairfromtheauxiliaryreservoircannotflowbacktothebrakepipeintime,resultinginapressuredifferenceonbothsidesofthemainpiston.Thispressuredifferencecanovercometheweightofthemainpiston,theresistanceoftheregulatingvalve,theresistanceofthestablespring,causethemainpistontomoveupwards,therebydrivingtheregulatingvalveandtheslidevalvetomoveupwardssuccessively,resultinginthefirstandsecondstagelocalpressurereductionandcommonlyusedbraking.

常用制动位ServiceBrakeApplicationPosition（四）

常用制动位ServiceBrakeApplicationPosition（四）当主活塞两侧形成的压力差克服主活塞、节制阀的自重及移动阻力、稳定弹簧的阻力时，主活塞首先压缩稳定弹簧，带动节制阀向上移动6mm（滑阀游间），至主活塞杆下肩与滑阀接触时止，由于滑阀与滑阀座之间的静摩擦力大于压缩稳定弹簧所需的力，滑阀暂时不动。节制阀沿滑阀背面向上移动后连通和关闭如下通路：Whenthepressuredifferenceformedonbothsidesofthemainpistonovercomestheweightofthemainpiston,theresistanceoftheregulatingvalveandtheresistanceofthestablespring,themainpistoncompressesthestablespringanddrivestheregulatingvalvetomoveupwardby6mm(theslidevalveclearance)untilthelowershoulderofthemainpistonrodcontactstheslidevalve.Duetothestaticfrictionbetweentheslidevalveandtheslidevalveseatbeinggreaterthantheforcerequiredtocompressthestablespring,theslidevalvetem