| With the rapid development of urban railway vehicles,higher performance is required for locking devices of door system.Locking device plays the decisive role in ensuring the safety of whole door system;therefore,R&D of locking devices with high performance becomes a significant research subject of door system.Few theoretical researches on high performance locking devices have been conducted by scholars at home and abroad and techniques of locking devices are kept secret by door system manufacturers of mass transit railway vehicles.Technical researches on door system locking devices enable us to grasp core technologies of high performance locking devices,increase performance indices of existing locking devices and guarantee safety of the rapid developing mass transit industry.It is not hard to find out that now the locking devices applied in mass transit passenger door system are relatively more mature and reliable,however locking system on cab door is still of high failure rate and low maintenance accessibility for its wide varieties.So it is important to develop a general locking device with high reliability,low failure rate and simple structure.In-depth researches have been conducted on locking devices of door system in this paper,major research contents and results are as follows:(1)According to design standard EN14752 Railway applications Bodyside entrance systems,the paper analyzed the structure and function of locking system,combined with modern design theory,optimized and designed a new type of cab sliding door locking system which not only meets standards,but also contains generalization concept.Reduce component quantity to maximum extent and strengthen the advantage of integration;change easily broken elastic cylinder pin structure to integrated castings structure or cylinder head connection structure;improve 2 independent pulling plates to H-shaped integrated pulling plate to strength the structure of locking device.The paper conducted structural design and 3D modeling of cab sliding door locking system by Solidworks.(2)Use Failure Mode Effects and Criticality Analysis(FMECA)method to analyze all possible failure modes of each component and their effect on the system,and then classify these failures according to criticality of failure and probability of occurrence.In this way,the paper concludes that criticality levels of ball-head tension rod and pin shaft of the whole locking device are relatively high,which lead the direction to further improvement of locking device structure.(3)Created finite element analysis model of key component of locking device,used ANSYS analysis software to conduct finite element analysis on ball-head pulling rod and strength of pin shaft to discretize actual solve area.Check stress distribution and deformation condition of locking device under designed load to verify safety coefficient of key components.(4)Static and dynamic test verifications are conducted on sample piece of locking device.Tested and assembled locking device test piece according to design drawing.Endurance test of test piece will operate more than 3×105 times of door opening and closing operation and function of locking device shall remain normal.Regarding shock and vibration test,under type 1 class A level test condition regulated in GB/T 21563,locking device shall be able to operate normally without any damage.After a series of tests,improve and optimize according to existing problems in order to reach final design requirements. |
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