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mso-hansi-font-family:"Times New Roman"">主回路</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">由液壓泵</span><span lang="EN-US">1(</span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">伺服變量軸向柱塞泵</span><span lang="EN-US">)</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">及液壓馬達</span><span lang="EN-US">2(</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">徑向柱塞式內曲線馬達</span><span lang="EN-US">)</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">組成的閉式容積調速系統，液壓馬達出軸直接帶動主動鏈輪。</span></p> <p class="MsoNormal"><span lang="EN-US"> <2)</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">補油回路</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">補油回路由濾油器</span><span lang="EN-US">6</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">、輔助泵</span><span lang="EN-US">7</span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">和單向閥組、濾油器</span><span lang="EN-US">8</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">及單向閥</span><span lang="EN-US">16</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">等組成，用來向閉式系統補充油液，進行熱交換。</span></p> <p class="MsoNormal"><span lang="EN-US"> (3)</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">熱交換回路</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">液壓馬達</span><span lang="EN-US">2</span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">回油側的熱油經液動換向閥</span><span lang="EN-US">3</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">、低壓溢流閥</span><span lang="EN-US">4</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">及冷卻器</span><span lang="EN-US">17</span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">回油箱，實現熱油的冷卻。</span></p> <p class="MsoNormal"><span lang="EN-US"><img src="/upload/images/201409/14104512515873.jpg" alt="" /><br /> <!--[endif]--></span></p> <p class="MsoNormal"><span lang="EN-US">(4)</span><span style="font-family:宋體; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">高、低壓保護回路</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">高壓安全閥</span><span lang="EN-US">5 (13MPa)</span><span style="font-family:宋體; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">進行高壓保護，低壓溢流閥</span><span lang="EN-US">4 (0.8^-1MPa)</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">進行低壓保護。當低壓系統壓力小于</span><span lang="EN-US">0. SMPa</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">時，旁通閥</span><span lang="EN-US">14</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">在彈簧作用下復位，高、低壓油路串通，液壓馬達停止工作，此回路也起低壓保護的作用。</span></p> <p class="MsoNormal"><span lang="EN-US"> <5)</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">“回鏈敲缸”保護</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">當機器停電，輔助泵</span><span lang="EN-US">7</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">停止供液時，液壓馬達在錨鏈彈性作用下呈液壓泵工況，旁通閥</span><span lang="EN-US">14</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">復位，油液經旁通閥</span><span lang="EN-US">14</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">節流孔循環，防止液壓馬達“敲缸”。</span></p> <p class="MsoNormal"><span lang="EN-US"> (6)</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">調速回零機構</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">液壓馬達的牽引速度，由手柄</span><span lang="EN-US">11</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">經螺旋副帶動調速回零機構</span><span lang="EN-US">10</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">的彈簧套，并經連桿帶動伺服閥進行調速。調速前，首先要使二位三通閥</span><span lang="EN-US">9</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">通電，系統向調速回零機構</span><span lang="EN-US">10</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">的液壓缸供液，使活塞桿升起進行解鎖，才能轉動手柄</span><span lang="EN-US">11</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">。電動機停電時，閥</span><span lang="EN-US">9</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">復位，調速機構上鎖，主泵自動回零。</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">當電動機超載時，閥</span><span lang="EN-US">9</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">動作，液壓缸的活塞桿在彈簧力的作用下，插人</span><span lang="EN-US">900</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">的</span><span lang="EN-US">V</span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">形塊，使彈簧套帶動伺服機構回零，牽引速度立即下降，以實現超載保護。</span></p> <p class="MsoNormal"><span lang="EN-US"> (7)</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">保護回路</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">圖</span><span lang="EN-US">8-18</span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">所示的液壓系統中有以下保護回路。</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">①初次啟動前利用手搖泵</span><span lang="EN-US">12</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">對全系統進行沖液及排氣，以保護系統正常啟動</span><span lang="EN-US">;</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">②當機器無冷卻噴霧水或當水壓小于</span><span lang="EN-US">0. 3MPa</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">時，水控的二位二通閥</span><span lang="EN-US">13</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">復位，通過遠控口使高壓安全閥</span><span lang="EN-US">5</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">卸荷，機器停止運動</span><span lang="EN-US">;</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">③當壓力表</span><span lang="EN-US">15</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">的壓力達到</span><span lang="EN-US">1. BMPa</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">時，表示濾油器</span><span lang="EN-US">8</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">嚴重堵塞，應及時更換閥芯</span><span lang="EN-US">;</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">當壓力低于。</span><span lang="EN-US">. 9 MPa</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">時，表示系統背壓過低，輔助泵部分可能出現故障或磨損嚴重，這時應停機檢查。</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">可以看出</span><span lang="EN-US">DY-150</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">型采煤機牽引部液壓系統是一個典型的閉式系統，它包括了前面介紹的幾種基本回路，也包括了幾種保護回路</span><span lang="EN-US">:</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">低速大轉矩內曲線馬達的“回鏈敲缸”保護回路</span><span lang="EN-US">;</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">初次啟動保護回路</span><span lang="EN-US">;</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">無冷卻水保護回路</span><span lang="EN-US">;</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">高、低壓保護回路，以滿足采煤機工作的要求。</span></p> <p class="MsoNormal" align="center" style="margin-top:4.5pt;margin-right:0cm; margin-bottom:7.5pt;margin-left:0cm;text-align:center;line-height:13.5pt; mso-pagination:widow-orphan;mso-outline-level:1"><b><span style="mso-bidi-font-size: 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