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style="font-family: 宋体;">，其液压泵调压部分的原理见图</span><span lang="EN-US">15-9</span><span style="font-family: 宋体;">。该液压系统供应机床的全部辅助功能动作，如机械手自动换刀，主轴松紧刀，高、低挡自动转换，</span><span lang="EN-US">B</span><span style="font-family: 宋体;">轴、托盘夹紧动作。</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">液压泵电机功率</span><span lang="EN-US">}. skw</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">，液压泵为</span><span lang="EN-US">Rexroth(</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">力士乐</span><span lang="EN-US">)</span><span style="font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">公司的轴向</span><span lang="EN-US">.</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">变量柱塞泵，型号</span><span lang="EN-US">AlOVS071DR-30PPKC62</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">，排量</span><span lang="EN-US">81. 4L/min</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">，压力</span><span lang="EN-US">6.89MPaa 3</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">号阀和</span><span lang="EN-US">4</span><span style="font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">号阀均安装在泵体上，是泵自带装置，由于该液压泵立式安装，</span><span lang="EN-US">3</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">号和</span><span lang="EN-US">4</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">号阀都随泵浸人油箱，平时不方便观察和调整。</span><span lang="EN-US">5</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">号阀安装在泵体外部的液压站集成块油路中，调整比较方便。有一段时间机床出现液压系统的主液压泵电机空气开关时常跳闸现象，用钳型电流表检测电机电流为</span><span lang="EN-US">20A</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">左右。维修工在排除电机本身和电器控制原因后，根据经验怀疑液压泵压力高造成电机过载，将图</span><span lang="EN-US">15-9</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">中</span><span lang="EN-US">5</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">号阀压力调低，结果第二天情况更为恶化，最终导致液压电机烧毁。</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">经认真分析液压原理并结合故障现象发现，压力系统中</span><span lang="EN-US">3</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">号阀和</span><span lang="EN-US">4</span><span style="font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">号阀均为液压泵自带调节阀，作用分别是限流和调压。</span></p> <p class="MsoNormal"><span lang="EN-US"> 3</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">号阀调定的是液压泵的最大输出流量，此参数是液压泵的关键参数，是液压设备液压泵选型的主要依据，液压泵所匹配的电机也是根据此参数计算确定，</span></p> <p class="MsoNormal"><span lang="EN-US"><img src="/upload/images/201409/14107077345812.jpg" alt="" /><br /> <!--[endif]--></span></p> <p class="MsoNormal"> </p> <p class="MsoNormal" style="text-align: center;"><b><span lang="EN-US" style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体; color:blue;mso-font-kerning:0pt"><a href="http://www.bethel-cnc.com/bethel/cnc/show_38.html"><span lang="EN-US">高速加工中心</span></a></span></b><span style="mso-bidi-font-size: 10.5pt;font-family:宋体;mso-bidi-font-family:宋体;mso-font-kerning:0pt;mso-bidi-font-weight: bold">专业生产<span lang="EN-US"><o:p></o:p></span></span></p> <p class="MsoNormal"><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">出厂前厂家已按所能负荷的最大流量调定，一般情况不允许用户任意调节，否则将出现电机负荷大、液压油发热和噪声等故障。</span></p> <p class="MsoNormal"><span lang="EN-US"> 4</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">号阀的作用是保证液压泵输出流量随着系统负·载的变化而变化，从而获得设定的稳定压力</span><span lang="EN-US">(pa)</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">。当液压泵输出压力</span><span lang="EN-US"><F4</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">时，</span><span lang="EN-US">4</span><span style="font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">号阀内的滑阀不动作，液压泵控制流量的斜盘在弹簧的作用下斜角增大，此时液压泵输出流量逐渐增大</span><span lang="EN-US">(</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">电机负荷也逐渐增大</span><span lang="EN-US">)</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">，系统压力也上升趋于</span><span lang="EN-US">p"</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">。当液压泵输出压力</span><span lang="EN-US">>p}</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">时，</span><span lang="EN-US">4</span><span style="font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">号阀的内阀芯右移，使油进人</span><span lang="EN-US">3</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">号阀的流量控制液压缸内，推动活塞左移从而克服弹簧力使泵内控制流量的斜盘斜角减小，此时液压泵输出流量逐渐减小</span><span lang="EN-US">(</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">电机负载也逐渐减小</span><span lang="EN-US">)</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">，系统压力也下降趋于</span><span lang="EN-US">p4 0</span></p> <p class="MsoNormal"><span lang="EN-US"> 5</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">号阀为液压系统的溢流阀，起安全阀作用。正常情况下</span><span lang="EN-US">5</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">号阀压力值应略高于</span><span lang="EN-US">4</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">号阀压力值</span><span lang="EN-US">(Fs>F4)o 5</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">号阀只在液压系统中外来压力</span><span lang="EN-US">(</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">如机床</span><span lang="EN-US">y</span><span style="font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">轴向下移动时，平衡液压缸内向外排出的油液压力</span><span lang="EN-US">)</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">高于</span><span lang="EN-US">4</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">号阀压力时卸荷，从而保护液压泵和液压元件不受损害。</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">如若凡</span><span lang="EN-US"><F4</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">，或液压泵输出压力等于</span><span lang="EN-US">ps</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">时，压力油就已经从</span><span lang="EN-US">5</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">号阀卸荷了，也就始终达不到</span><span lang="EN-US">p4</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">值。所以，根据变量柱塞泵的工作原理，液压泵控制流量的斜盘则一直处于最大斜角，液压泵则一直以最大流量输出，电机</span><span lang="EN-US">.</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">就长期处于最大负荷工作状态，从而导致液压泵电机过载乃至烧毁。此次调低</span><span lang="EN-US">5</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">号阀压力使</span><span lang="EN-US">ps Gpa</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">，就是造成电机损坏的根本原因。</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">这是一个误诊导致调节失误的例子。因此，遇到设备液压故障应先研究分析液压原理图，不能只凭经验和感觉育目处理。调整液压压力时，不能只看压力表值，应一边调整一边检测液压电机电流，同时注意观察油液温升和液压泵噪声变化。</span></p></div> <div class="blank30"></div> <!-- tag --> <div class="blank10"></div> 标签： <a href='/index.php?case=tag&act=show&tag=%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>加工中心</a> <a href='/index.php?case=tag&act=show&tag=%E7%BB%B4%E4%BF%AE' target='_blank'>维修</a> <!-- 分类 --> <div class="blank10"></div> 分类： <a href='/bethel/type/jnc/type-1.html' target='_blank'>加工中心</a> <div class="blank30"></div> <!--自动调用自定义字段--> <div class="blank20"></div> <div class="blank30"></div> <!-- 投票 --> <script src="/index.php?case=vote&act=view&aid=407"></script> <!-- 自定义表单开始 --> <!-- 自定义表单结束 --> <div class="blank60"></div> <!-- 上下页开始 --> <div id="page"> <strong>上一篇</strong><a 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