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以传递动åŠ?功率)ä¸ÞZ¸»åQŒä»¥ä¼ é€’信息äؓ辅。在液压技术中¿UîCؓ液压传动¾pȝ»Ÿã€?br />     (2)控制¾pȝ»Ÿ<br />     以传递信息äؓ主,以传递动力äؓ辅。在液压技术中¿UîCؓ液压控制¾pȝ»Ÿã€?br />     应该指出åQŒä¼ åŠ¨ç³»¾lŸå’ŒæŽ§åˆ¶¾pȝ»Ÿåœ¨å…·ä½“结构上往往是合在一èµïLš„。随着¿U‘学技术的˜q…猛发展åQŒå¯¹çŽîC»£æœºå™¨è®‘Ö¤‡çš„要求愈来愈高,往往传递动力和控制指标都很重要。例如兵器、航½Iø™ˆªå¤©è®¾å¤‡ã€æ•°æŽ§æœºæ¢°åŠ å·¥è®¾å¤‡ç­‰åQŒå…¶åšåŠŸæ‰€éœ€çš„功率依靠流体系¾lŸï¼Œçœ‹è“v来是传动¾pȝ»ŸåQŒä½†å¯ÒŽŽ§åˆ¶è¦æ±‚也很高åQŒåˆ¾cÖM¼¼æŽ§åˆ¶¾pȝ»ŸåQŒå› æ­¤å¾ˆéš¾è¯´˜q™æ ·çš„ç³»¾lŸæ˜¯ä¼ åŠ¨¾pȝ»Ÿæˆ–是控制¾pȝ»Ÿã€‚所以,上述分类æ–ÒŽ³•ä¸æ˜¯¾lå¯¹çš„ã€?br />     从系¾lŸæ˜¯å¦é‡‡ç”¨åé¦ˆè£…¾|®ï¼Œ˜q˜å¯˜q›ä¸€æ­¥å°†¾pȝ»Ÿåˆ’分为开环系¾lŸå’Œé—­çŽ¯¾pȝ»Ÿä¸¤ç±»ã€?br />     (1)开环系¾l?br />     开环系¾lŸæ˜¯ä¸ç”¨åé¦ˆè£…置的系¾lŸï¼Œå¦‚图1-2所½Cºï¼Œå…¶è¾“出特性完全取决于单个元äšg的特性及元äšg在系¾lŸä¸­çš„组合情å†üc€‚当外界对系¾lŸæœ‰æ‰°åŠ¨æ—Óž¼Œæ‰§è¡Œå…ƒäšg的输出量一般就要偏¼›ÕdŽŸæœ‰è°ƒå®šå€ÆD€Œäñ”生一定的误差。由于开环系¾lŸçš„抗扰动能力较差,控制的质量受工作条äšg(如æÑa温、负载等)变化的媄响很大,故系¾lŸè¾“出量的精度较低,严重时甚è‡Ïx— æ³•è¾¾åˆ°æ—¢å®šçš„目标ã€?br /> <p>     液压泵→液压控制元äšg→液压执行元件→负蝲 </p> <p> <img src="/uploads/image/20200527/20200527092047_8285.jpg" alt="挖掘机维修厂——液压传动的基本原理åQˆäºŒåQ? width="300" height="109" title="挖掘机维修厂——液压传动的基本原理åQˆäºŒåQ? align="" /> </p>     å›?-2 开环系¾l?br />     (2)闭环¾pȝ»Ÿ<br /> <p>     闭环¾pȝ»Ÿæ˜¯é‡‡ç”¨åé¦ˆè£…¾|®çš„¾pȝ»ŸåQŒå¦‚å›?-3所½Cºã€‚反馈装¾|®å¯¹è¾“出的状态取æ øP¼Œäº§ç”Ÿä¸€ä¸ªä¸Žè¯¥è¾“出成比例的反馈信åøP¼Œòq¶å°†å®ƒä¸Žè¾“入信号相比较,如果反馈信号与输入信号之间有差别åQŒå°±è‡ªåŠ¨¾U æ­£è¾“出åQŒä‹É它与输入的要求相½W¦åˆã€‚由于闭环系¾lŸå…·æœ‰è¾ƒå¼ºçš„抗扰动能力,控制质量受工作条件变化的影响较小åQŒå¯ä»¥ç”¨ä¸€èˆ¬å…ƒä»¶ç»„成较¾_„¡¡®çš„控制系¾lŸï¼Œòq¶ä¸”¾pȝ»Ÿè¾“出量的¾_‘Öº¦è¾ƒé«˜ã€?</p> <p> <img src="/uploads/image/20200527/20200527092122_4016.jpg" alt="挖掘机维修厂——液压传动的基本原理åQˆäºŒåQ? width="300" height="359" title="挖掘机维修厂——液压传动的基本原理åQˆäºŒåQ? align="" /> </p>     å›?-3 闭环¾pȝ»Ÿ<br />     按液压系¾lŸä¸­æ²ÒŽ¶²çš„åó@环方式可分äؓ开式和闭式两种¾pȝ»Ÿã€?br />     (1)开式系¾l?br />     泵自油箱吸æÑaåQŒå…¶æŽ’出的æÑa液供¾l™æ¶²åŽ‹çŽ×或液压马达,驱动它们做功åQŒè€Œæ¶²åŽ‹çŽ×或液压马辄¡š„回æÑa‹¹å›žæ²¹ç®±åQŒæ­¤å›_¼€å¼ç³»¾lŸã€?br />     开式系¾lŸçš„¾l“æž„½Ž€å•ã€‚æÑa½Ž±æ˜¯å¼€å¼ç³»¾lŸä¸­å·¥ä½œä»‹è´¨çš„贮存场所åQŒæ•…æ²ÒŽ¶²å¯åœ¨æ²¹ç®±ä¸­å¾ˆå¥½åœ°æ•£çƒ­å†·å´ã€é€¸å‡º½Iºæ°”及沉淀杂质åQŒä½†˜q™éœ€æœ‰è¾ƒå¤§å®¹¿U¯çš„油箱。开式系¾lŸæ˜¯ä¾é æ“çºµæ¢å‘阀来ä‹É执行机构换向的,故换向时(如图1-4中的换向阀左位¿U»è‡³ä¸­ä½æ—?åQŒå…·æœ‰æ­£é®ç›–¾l“构的换向阀会ä‹É液压传动¾pȝ»Ÿäº§ç”ŸåŽ‹åŠ›å†²å‡»;同时åQŒç”±äºŽå¤–负蝲的惯性会使液压马辄¡‘ô¾l­æ—‹è½¬è€Œå‘ˆæ³ëŠš„工况åQŒç‘ô¾l­å°†æ²¹ä»ŽA边输送到B边,而换向阀的中位已ž®†æ¶²åŽ‹é©¬è¾„¡š„˜q›å‡ºæ²¹èµ\ž®æ­»åQŒæ•…B边的油压ž®†è¿…速高于A辏V€‚当外负载的惯性较大时åQŒB边将产生压力冲击åQŒæ•…必须在A、B辚w—´è®„¡½®åŒå‘溢流阀(作制动阀)åQŒä»¥é™åˆ¶B½Ž?或A½Ž?内的制动油压力,消除油压冲击。由此可知,开式系¾lŸä¸­çš„液压马达或液压¾~¸åœ¨åˆ¶åŠ¨åŠæ¢å‘过½E‹ä¸­åQŒå¤–负蝲的惯性运动能量不能回æ”Óž¼Œè€Œæ˜¯æ¶ˆè€—在æ²ÒŽ¶²¾låˆ¶åŠ¨é˜€çš„节‹¹å‘热中(能耗制åŠ?。此外,在重力下降系¾lŸä¸­åQŒå½“出现外负载对¾pȝ»ŸåšåŠŸçš„工冉|—¶åQŒæ¶²åŽ‹é©¬è¾‘Ö‘ˆæ³µå·¥å†µï¼Œä¸ºé˜²æ­¢å¤–负蝲­‘…速下降,必须在回油管上设¾|®èƒ½äº§ç”ŸèƒŒåŽ‹çš„液压元ä»Óž¼Œä½†è¿™ž®†å¼•èµ¯‚ƒ½è€—åƈ使æÑa液发çƒ?能耗限é€?ã€?br /> <p>     (2)闭式¾pȝ»Ÿ </p> <p> <img src="/uploads/image/20200527/20200527092213_2976.jpg" alt="挖掘机维修厂——液压传动的基本原理åQˆäºŒåQ? width="300" height="281" title="挖掘机维修厂——液压传动的基本原理åQˆäºŒåQ? align="" /> </p>     å›?-5 闭式¾pȝ»Ÿ<br />     如图1-5所½Cºï¼Œæ³µa的进出æÑa口与液压马达b的进出口分别用管道连接,形成一闭合回èµ\。操¾U‰|܇a的变量机构以改变液流的方向,卛_¯ä½¿æ¶²åŽ‹é©¬è¾¾æ¢å‘。阀1ï½?共同¾l„成双向安全阀åQŒä»¥é˜²æ­¢A、B½Ž¡å†…çš„æÑa压超˜q‡é˜€3的调定倹{€‚äؓ补充¾pȝ»Ÿçš„泄漏,˜q˜éœ€è®„¡½®ä¸€ä¸ªè¾ƒž®çš„辅助泵cåQŒå…¶å·¥ä½œåŽ‹åŠ›ç”±æº¢‹¹é˜€6调定åQŒåº”比液压马达b所需背压略高。而æ܇c的流量应略高于系¾lŸçš„泄漏量。由泵c排出的æÑa¾læ×o油器、单向阀1æˆ?(它们å…ég½œè¡¥æÑa阀)再补充到¾pȝ»Ÿçš„低压边;多余的æÑa液经阀6溢流回æÑa½Ž±ã€?br />     ç”׃¸Šé¢çš„分析知,闭式¾pȝ»Ÿçš„结构较复杂。闭式系¾lŸä¸­ä¸€ä¸ªæÑa源一般只能äؓ一个液压执行机构供油,òq‰™‡‡ç”¨åŒå‘变量æ܇调速和换向。此外,ç”׃ºŽæ²ÒŽ¶²åŸºæœ¬ä¸Šéƒ½åœ¨é—­åˆå›žè·¯å†…循环åQŒä¸Žæ²¹ç®±äº¤æ¢çš„æÑa量仅为系¾lŸçš„泄漏量,故æÑa液温升较快,但所需油箱容积ž®ï¼Œ¾l“构紧凑。由于液压马达b的回æ²ÒŽ˜¯ç›´æŽ¥‹¹å…¥æ³µa吸入口,故具有背压的回æÑa能帮助电机拖动æ܇aåQŒåƈ使æ܇a呈压力供油状态,降低了对泵a的自吸性的要求。而开式系¾lŸä¸­å…ähœ‰èƒŒåŽ‹çš„回æ²ÒŽ˜¯ä¸èƒ½èµ·åˆ°˜q™äº›¿U¯æžä½œç”¨çš„,而是把这部分可以利用的能量白白地损耗在背压阀的节‹¹å‘热中ã€?br />     闭式¾pȝ»Ÿçš„制动过½E‹æ˜¯é€šè¿‡æ“çºµæ³µa的变量机构,使其排量逐步变äؓ零来实现的。在此过½E‹ä¸­åQŒå¤–负蝲的惯性力变成了主动力åQŒåŠ›å›¾æ‹–动液压马达b以原速运动而呈泵工况,ž®†æÑa液输¾l™æ܇aåQŒä‹Éæ³µa呈液压马辑ַ¥å†µï¼Œæ³µa带动甉|œºåŠ é€Ÿæ—‹è½¬è€Œå‘电,输给ç”늽‘中的其他负蝲。这æ øP¼Œå¤–负载的惯性运动能通过马达b变成了æÑa压能åQŒä‹É马达b的回油边(例如为Bè¾?的æÑa压力升高åQŒå…¶æœ€å¤§å€¼ç”±é˜€3限定åQŒä»Žè€Œé˜²æ­¢Bè¾¹äñ”生压力冲击,òq¶ä‹É马达b逐渐减速、制动。同æ—Óž¼ŒB边的油压能则通过泵a带动甉|œºå˜æˆç”µèƒ½åQŒä»Žè€Œå®žçŽîCº†åˆ¶åŠ¨˜q‡ç¨‹ä¸­çš„能量回收(再生制动)。在外负载的惯性较大、换向很频繁æ—Óž¼Œ˜q™ç§å†ç”Ÿèƒ½é‡æ˜¯å¾ˆå¯è§‚çš„ã€?br />     在重力下降机构中åQŒå½“出现外负载对¾pȝ»ŸåšåŠŸçš„工冉|—¶åQŒæ¶²åŽ‹æ‰§è¡Œæœºæž„呈液压泵工况,泵a则呈马达工况åQŒæ‹–动电机发电,输给ç”늽‘中的其他负蝲åQŒä»Žè€Œé˜²æ­¢å¤–负蝲的超速下é™?再生限é€?。但当液压æ܇由内燃机拖动æ—Óž¼Œåˆ™ä¸èƒ½å®žçŽ°å†ç”Ÿåˆ¶åŠ¨åŠå†ç”Ÿé™é€Ÿã€?br />     ¾lég¸Šæ‰€˜qŽÍ¼Œå¼€å¼ç³»¾lŸé€‚用于功率较ž®çš„机构、内燃机驱动机构(如铲车、高½IÞZ½œä¸šèžR、液压汽车式起重机及挖掘机等)以及固定式机æ¢îC¸Šã€‚而闭式系¾lŸåˆ™é€‚用于液压æ܇ç”Þq”µæœºé©±åŠ¨çš„下述机构åQšå¤–负蝲惯性较大且换向频繁的机æž?如一些è“v重机的旋转、运行机构及龙门刨床、拉床和¾_‘Ö¯†òq³é¢¼‚¨åºŠçš„工作台½{?åQŒé‡åŠ›ä¸‹é™æœºæž?如不òqŒ™¡¡¾cÕdž‹çš„è“v升、动臂摆动机构等)åQŒå¤–负蝲惯性较大的重力下降机构(如åã^衡类型è“v重机的变òq…机构等)。另外,闭式¾pȝ»Ÿä¹Ÿé€‚用于要求结构特别紧凑的¿UÕdŠ¨å¼æœºæ¢îC¸Š(如液压汽车、拖拉机及矿车等˜qè¡Œæœºæž„)åQŒåœ¨ä¸‡å¨è½®çš„舉|œºã€å¯è°ƒèžºè·èžºæ—‹æ¡¨½{‰çš„泉|Ž§é©¬è¾¾ã€æ܇控液压çŽ×的系¾lŸä¸­ä¹Ÿå¸¸ç”¨é—­å¼ç³»¾lŸã€?br /></p><br /> </div> <div class="newArtiNext mt10"><div>上一æ?<a href="323.html">çŽîC»£R215 VS挖掘机突焉™€Ÿåº¦æ…¢æ— åŠ›åŽŸå› åˆ†æž?云南çŽîC»£æŒ–掘机维修厂</a></div> <div>下一æ?<a href="321.html"> 挖掘机维修——液压传动的基本原理åQˆä¸€åQ?</a></div> </div> <div class="tag">相关标签åQ?a href="/download/">挖掘机维ä¿?/a>,<a href="/news/wjjwx">挖掘æœÞZ¿®ç?/a>,<a href="/about/about5.html">挖掘机维修厂</a></div> <div class="crumb mt15"> <span class="fl font_w fb fs22">相关新闻<b class="fs14 fn font_i ml5">RELATED NEWS</b></span> </div> <div class="insNews1 clearfix 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