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åQ?åQ‰æµ‹è¯•é“²æ–—çŽ×ž®è…”压力å€égؓ5.2MPaã€?br />     åQ?åQ‰ç”¨æ‰‹æ¡æ‘怸¤æ³µå‡ºå£åŽ‹åŠ›ç®¡åQŒæœ‰æŒ¯åŠ¨æ„Ÿè§‰ã€?br />     从以上检查情况可以看出,故障原因可能是由于压力æÑa没有˜q›å…¥æ¶²åŽ‹¾~¸ã€?br />     2.¾pȝ»Ÿåˆ†æžä¸ŽæŽ’除故éš?br />     由WY60A挖掘机液压系¾lŸå›¾åQˆå›¾1-29åQ‰å¯çŸ¥ï¼Œæ­¤æœºé‡‡ç”¨åŒè”液压泵,分别向两¾l„多路换向阀供æÑaåQˆç³»¾lŸé«˜åŽ‹åŠ›25MPa)åQŒç„¶åŽå†æ ÒŽ®ä¸åŒå·¥å†µå‘各工作装置供æÑaã€?br /> <img src="/uploads/image/20210818/20210818111633_8048.jpg" alt=" WY60A挖掘机工作中出现双™¡ŒèµîC¸åŠ¨ã€é“²æ–—不能卸料的故障原因与排é™? width="350" height="309" title=" WY60A挖掘机工作中出现双™¡ŒèµîC¸åŠ¨ã€é“²æ–—不能卸料的故障原因与排é™? align="" /><br />     两阀¾l?1å’?6ç”?个三位六通阀¾l„成åQŒæŒ‰æ“ä½œ™åºåº˜q›è¡Œå•ç‹¬˜qåŠ¨å’Œå¤åˆè¿åŠ¨ã€?br />     一个液压æ܇输出的压力æÑaåQŒç»˜q‡å¤šè·¯é˜€11中的换向阀①、②、③后,分别驱动回è{马达、斗杆çŽ×1和左行走马达6。在˜q?个换向阀均不能换向的情况下,操纵合流阀④,æ²ÒŽµå¯ä»¥˜q›å…¥åŠ¨è‡‚¾~?的大腔或铲斗¾~?的大腔,从而加快动臂提升和铲斗挖掘ã€?br />     另一个液压æ܇输出的高压æÑaåQŒè¿›å…¥ä¸å¸¦å›žè½¬çš„多èµ\换向阀¾l?6。经˜q‡æ¢å‘阀③、⑤、⑦分别驱动铲斗¾~?动臂¾~?、右行走马达4。操¾Uµåˆ‹¹é˜€â‘¢ï¼Œé«˜åŽ‹æ²¹è¿›å…¥æ–—杆çŽ×1åQŒä»Žè€Œå®žçŽ°é˜€å¤–合‹¹ï¼Œä½¿æ–—杆çŽ×伸出或收¾~©ã€?br />     由此可以看出åQŒå³è¡Œèµ°é©¬è¾¾4受多路换向阀¾l?6中阀心⑦控制åQ›é“²æ–—çŽ×大腔åQˆæŒ–掘状态)å?1å’?6两个多èµ\换向阀¾l„控åˆÓž¼Œè€Œå…¶ž®è…”åQˆé“²æ–—收¾~©ï¼‰åªå—多èµ\换向阀¾l?6中换向阀⑤控制ã€?br />     出现故障的两个单元是由多路换向阀¾l?6供æÑa的,而其他动作不是阀11单独控制åQŒå°±æ˜¯é˜€26ã€?1通过合流控制。所以其他单元仍能动作。因此,可以初步认äؓåQŒé—®é¢˜å¯èƒ½å‡ºåœ¨å¤šè·¯æ¢å‘阀¾l?6中ã€?br />     对于多èµ\换向阀¾l„对应铲斗卸料和双™¡Œèµ°çš„二次溢流阀åQŒå¯é‡‡å–临时强制堵塞措施åQŒä‹É其不能è“v到溢‹¹ä½œç”¨ï¼Œç›®çš„是防止二‹Æ¡æº¢‹¹é˜€æ³„漏引è“v¾pȝ»Ÿé™åŽ‹åQŒä½†æ•…障现象仍没有消除。将换向阀â‘?⑤的阀心分别与其他工作正常的阀心调换,故障依然没能消除。按照维修规½E‹è¦æ±‚,寚w˜€¾l?6中的ä¸Õd®‰å…¨é˜€˜q›è¡Œè§£ä½“拆检åQŒå‘çŽîC¸»é˜€é˜€å¿ƒå°å­”被杂物堵塞。经清洗后装机,逐步调整臌™§„定压力,故障消失ã€?br />     3.故障原因<br />     本机ä¸Õd®‰å…¨é˜€¾l“构为差动溢‹¹é˜€åQˆå›¾1-30åQ‰ã€‚正常工作时åQŒæ¥è‡ªæ¶²åŽ‹æ܇的压力æÑaåQŒç»˜q‡ä¸»é˜€å¿ƒä¸Šçš„小孔到达B腔,作用在锥阀å¿?上。当¾pȝ»ŸåŽ‹åŠ›­‘…过讑֮šåŽ‹åŠ›æ—Óž¼Œå…ˆå¯¼é”¥é˜€é˜€å¿ƒé¦–先打开åQŒB腔压力æÑa‹¹è‡³å›žæÑa通道åQŒB腔压力æÑa˜q…速降压,而主阀å¿?中的ž®å­”直径很小åQŒåªæœ?~2mmåQŒå¯¹æ²ÒŽ¶²äº§ç”Ÿé˜Õd°¼ä½œç”¨åQŒä‹É得A上两腔äñ”生压差。于是,主阀心在压差作用下被打开åQŒæÑa液被直接排至回æÑa½Ž¡èµ\åQŒä»Žè€Œä¿æŠ¤ç³»¾lŸå…ƒä»¶ã€?br /> <img src="/uploads/image/20210818/20210818111659_5532.jpg" alt=" WY60A挖掘机工作中出现双™¡ŒèµîC¸åŠ¨ã€é“²æ–—不能卸料的故障原因与排é™? width="350" height="159" title=" WY60A挖掘机工作中出现双™¡ŒèµîC¸åŠ¨ã€é“²æ–—不能卸料的故障原因与排é™? align="" /><br />     由此可见åQŒå®‰å…¨é˜€æ˜¯é ä¸»é˜€å¿ƒä¸Šçš„小孔阻ž®ég½œç”¨äñ”生压差,从而控制主阀心的动作。当主阀心小孔被堵塞æ—Óž¼Œ¾pȝ»Ÿæ²¹åŽ‹ž®†é¦–先直接作用在主阀å¿?上,òq¶ä‹É阀心打开åQˆä¸»é˜€å¿ƒå›žä½å¼¹½§è¾ƒè½¯ï¼‰ã€‚è¿™æ øP¼Œåªè¦æŒ–掘æœø™“v动,便ä‹É主阀心处于开启状态。因而,¾pȝ»Ÿå»ºç«‹ä¸è“v压力åQŒå¤šè·¯æ¢å‘阀¾l?1也就没有压力åQŒä¹ŸåÏx˜¯æ•…障所在ã€?br /></p><br /> </div> <div class="newArtiNext mt10"><div>上一æ?<a href="373.html">如何解决挖掘机发动机下排气大、喷机æÑa问题åQ?/a></div> <div>下一æ?<a 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