动车组停放制动故障原因分析及改进措施
高靖添马永靖孟繁辉张笑凡李松王雯杨洋
Cause Analysis and Improvement Measures of EMU Parking Brake Failure
GAO JingtianMA YongjingMENG FanhuiZHANG XiaofanLI SongWANG WenYANG Yang
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作者信息:1.中车长春轨道客车股份有限公司国家轨道客车工程研究中心， 130062， 长春
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Affiliation:National Engineering Research Center of Railway Vehicles, CRRC Changchun Railway Vehicles Co., Ltd., 130062, Changchun, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.04.017
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中图分类号/CLCN:U270.35∶U266.2
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栏目/Col:研究报告
摘要:
动车组偶发停放制动无法正常施加的故障，给停放在坡道上的动车组带来溜车的安全隐患。阐述了停放制动控制原理和双脉冲电磁阀工作原理，判断出动车组停放制动无法正常施加故障是由双脉电磁阀卡滞导致的。通过对电磁阀进行拆解分析进而推断，阀杆(柱塞)密封件滑动到铜套导气孔附近是导致双脉冲电磁阀卡滞情况发生的原因。原因分析结果表明，采用倒角去毛刺工艺的铜套导气孔不够光滑，使密封件滑动到铜套导气孔附近发生卡滞，密封失效，进而导致双脉冲电磁阀无法正常施加停放制动。由此提出两项改进措施：铜套导气孔采用研磨抛光去毛刺工艺，将阀杆中间两处K形圈更改为O形圈，并配合O形圈对阀杆局部结构进行适应性调整；对双脉冲电磁阀阀杆密封件的润滑脂用量进行定量控制。针对改进措施，定制双脉冲电磁阀试验样件，在疲劳试验后进行故障重现试验,试验结果验证了改进措施的有效性。
Abstracts:
The occasional parking brake failure of EMU (electric multiple units) brings safety hazards of train sliding for EMU train parking on slopes. The working principles of parking brake control principle and DASV (dual acting solenoid valve) are expounded, and it is judged that the EMU parking brake failure is caused by stuck DASV. By disassembling and analyzing the solenoid value, it is further deduced that the valve stem (plunger) sealing element sliding until adjacent to copper sleeve vent is the cause of DASV stuck. The champer deburring technique adopted for copper sleeve vent makes it not smooth enough, causing the sealing element stuck when it reaches the neighboring area，finally leading to the DASV failure to apply the parking brake normally. Two improvement measures are proposed: to adopt grinding deburring technique for copper sleeve vent, replace the two K-shape sealing rings in stem middle to O-shape sealing rings, and adjust the stem local structure with the O-shape rings; quantify the lubricating grease used on the DASV stem sealing element. As for the improvement measure, DASV test samples are tailor-made, and the failure reproduction test is carried out after fatigue test, and test results verify their effectiveness.
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