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面包屑導航結束 --> <!-- 頁面標題開始 --> <div id="n1l1njb9b" class="title"> <h3><a>加工中心液壓故障診斷中的失誤<small></small></a></h3> </div> <!-- 頁面標題結束 --> <hr class="featurette-divider"> <!-- 中部開始 --> <div id="n1l1njb9b" class="container"> <!-- 正文 --> <div id="n1l1njb9b" class="lead" id="print"> <p><span style="font-family: 宋體;">一臺美國臥式<a ><strong>加工中心</strong></a></span><span style="font-family: 宋體;">，其液壓泵調壓部分的原理見圖</span><span lang="EN-US">15-9</span><span style="font-family: 宋體;">。該液壓系統供應機床的全部輔助功能動作，如機械手自動換刀，主軸松緊刀，高、低擋自動轉換，</span><span lang="EN-US">B</span><span style="font-family: 宋體;">軸、托盤夾緊動作。</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"">液壓泵電機功率</span><span lang="EN-US">}. skw</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">，液壓泵為</span><span lang="EN-US">Rexroth(</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">力士樂</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"">公司的軸向</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"">變量柱塞泵，型號</span><span lang="EN-US">AlOVS071DR-30PPKC62</span><span style="font-family:宋體;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:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">，壓力</span><span lang="EN-US">6.89MPaa 3</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">號閥和</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"">號閥均安裝在泵體上，是泵自帶裝置，由于該液壓泵立式安裝，</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"">號和</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"">號閥都隨泵浸人油箱，平時不方便觀察和調整。</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"">號閥安裝在泵體外部的液壓站集成塊油路中，調整比較方便。有一段時間機床出現液壓系統的主液壓泵電機空氣開關時常跳閘現象，用鉗型電流表檢測電機電流為</span><span lang="EN-US">20A</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">左右。維修工在排除電機本身和電器控制原因后，根據經驗懷疑液壓泵壓力高造成電機過載，將圖</span><span lang="EN-US">15-9</span><span style="font-family:宋體;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:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">號閥壓力調低，結果第二天情況更為惡化，最終導致液壓電機燒毀。</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"">經認真分析液壓原理并結合故障現象發現，壓力系統中</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"">號閥和</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"">號閥均為液壓泵自帶調節閥，作用分別是限流和調壓。</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"">號閥調定的是液壓泵的最大輸出流量，此參數是液壓泵的關鍵參數，是液壓設備液壓泵選型的主要依據，液壓泵所匹配的電機也是根據此參數計算確定，</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:宋體;mso-bidi-font-family:宋體; color:blue;mso-font-kerning:0pt"><a ><span lang="EN-US">高速加工中心</span></a></span></b><span style="mso-bidi-font-size: 10.5pt;font-family:宋體;mso-bidi-font-family:宋體;mso-font-kerning:0pt;mso-bidi-font-weight: bold">專業生產<span lang="EN-US"><o:p></o:p></span></span></p> <p class="MsoNormal"><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">出廠前廠家已按所能負荷的最大流量調定，一般情況不允許用戶任意調節，否則將出現電機負荷大、液壓油發熱和噪聲等故障。</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"">號閥的作用是保證液壓泵輸出流量隨著系統負·載的變化而變化，從而獲得設定的穩定壓力</span><span lang="EN-US">(pa)</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">。當液壓泵輸出壓力</span><span lang="EN-US"><F4</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">時，</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"">號閥內的滑閥不動作，液壓泵控制流量的斜盤在彈簧的作用下斜角增大，此時液壓泵輸出流量逐漸增大</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"">電機負荷也逐漸增大</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"">，系統壓力也上升趨于</span><span lang="EN-US">p"</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">。當液壓泵輸出壓力</span><span lang="EN-US">>p}</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">時，</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"">號閥的內閥芯右移，使油進人</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"">號閥的流量控制液壓缸內，推動活塞左移從而克服彈簧力使泵內控制流量的斜盤斜角減小，此時液壓泵輸出流量逐漸減小</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"">電機負載也逐漸減小</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"">，系統壓力也下降趨于</span><span lang="EN-US">p4 0</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"">號閥為液壓系統的溢流閥，起安全閥作用。正常情況下</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"">號閥壓力值應略高于</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"">號閥壓力值</span><span lang="EN-US">(Fs>F4)o 5</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">號閥只在液壓系統中外來壓力</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"">如機床</span><span lang="EN-US">y</span><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">軸向下移動時，平衡液壓缸內向外排出的油液壓力</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"">高于</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"">號閥壓力時卸荷，從而保護液壓泵和液壓元件不受損害。</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"">如若凡</span><span lang="EN-US"><F4</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">，或液壓泵輸出壓力等于</span><span lang="EN-US">ps</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">時，壓力油就已經從</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"">號閥卸荷了，也就始終達不到</span><span lang="EN-US">p4</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">值。所以，根據變量柱塞泵的工作原理，液壓泵控制流量的斜盤則一直處于最大斜角，液壓泵則一直以最大流量輸出，電機</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"">就長期處于最大負荷工作狀態，從而導致液壓泵電機過載乃至燒毀。此次調低</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"">號閥壓力使</span><span lang="EN-US">ps Gpa</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">，就是造成電機損壞的根本原因。</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"">這是一個誤診導致調節失誤的例子。因此，遇到設備液壓故障應先研究分析液壓原理圖，不能只憑經驗和感覺育目處理。調整液壓壓力時，不能只看壓力表值，應一邊調整一邊檢測液壓電機電流，同時注意觀察油液溫升和液壓泵噪聲變化。</span></p></div> <div id="n1l1njb9b" class="blank30"></div> <!-- tag --> <div id="n1l1njb9b" class="blank10"></div> 標簽： <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'>維修</a> <!-- 分類 --> <div id="n1l1njb9b" class="blank10"></div> 分類： 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