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class="inside_rnewtil">VT700型現(xiàn)場(chǎng)動(dòng)平衡測(cè)量儀概述技術(shù)參數(shù)</h1> <div id="pvhr3jx3r5" class="inside_rnewtime">點(diǎn)擊次數(shù)：1380 更新時(shí)間：2019-04-11</div> <div id="pvhr3jx3r5" class="inside_rnewcon"><p><strong><span style="font-size:12pt"><span style="font-family:宋體">一、</span></span><span style="font-size:16px"><span style="background-color:rgb(255, 255, 255); color:rgb(51, 51, 51); font-family:microsoft yahei,simhei">VT700型現(xiàn)場(chǎng)動(dòng)平衡測(cè)量儀</span></span><span style="font-size:12pt"><span style="font-family:宋體">概述 </span></span></strong></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體"> 隨著現(xiàn)代化工業(yè)的飛速發(fā)展，對(duì)旋轉(zhuǎn)機(jī)械的性能提出了越來越高地要求。旋轉(zhuǎn)設(shè)備其質(zhì)量中心由于種種原因與旋轉(zhuǎn)中心不重合時(shí)會(huì)因離心力產(chǎn)生振動(dòng)。該振動(dòng)嚴(yán)重影響了設(shè)備使用精度，縮短支撐軸承的壽命。要消除這種振動(dòng)必須用到動(dòng)平衡技術(shù)。</span></span></p><p><strong><span style="font-size:16px"><span style="font-family:microsoft yahei,simhei">VT700型現(xiàn)場(chǎng)動(dòng)平衡測(cè)量儀</span></span></strong><span style="font-size:12.0000pt"><span style="font-family:宋體">瞄準(zhǔn)國內(nèi)外高技術(shù)，采用大規(guī)模集成電路和單片機(jī)技術(shù)。該儀器具有多功能性，既可作轉(zhuǎn)速表用，又可作振動(dòng)測(cè)試用。既可作時(shí)域分析，又可作頻域分析。特別是具有測(cè)量動(dòng)平衡的一切功能。</span></span></p><p><strong><span style="font-size:16px"><span style="font-family:microsoft yahei,simhei">VT700型現(xiàn)場(chǎng)動(dòng)平衡測(cè)量儀</span></span></strong><span style="font-size:12.0000pt"><span style="font-family:宋體">作簡單，人機(jī)對(duì)話，菜單提示，測(cè)量數(shù)據(jù)可隨時(shí)鎖定保持。動(dòng)平衡儀結(jié)構(gòu)緊湊重量輕，鍵盤、顯示屏、輸入插口均置于面板上。VT動(dòng)平衡儀可以對(duì)各種旋轉(zhuǎn)機(jī)械進(jìn)行整機(jī)現(xiàn)場(chǎng)動(dòng)平衡，相當(dāng)于一臺(tái)可移動(dòng)的動(dòng)平衡機(jī)。它設(shè)計(jì)精巧攜帶方便，整個(gè)儀器裝在一只便攜儀器箱內(nèi)。 </span></span></p><p><strong><span style="font-size:16px"><span style="font-family:microsoft yahei,simhei">VT700型現(xiàn)場(chǎng)動(dòng)平衡測(cè)量儀</span></span></strong><span style="font-size:12.0000pt"><span style="font-family:宋體">面板示意圖</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"><img alt="" src="http://img68.chem17.com/9/20190411/636905680937649831846.png" style="height:393px; width:465px" />、</span></span></p><p><strong><span style="font-size:12pt"><span style="font-family:宋體">二、</span></span><span style="font-size:16px"><span style="font-family:microsoft yahei,simhei">VT700型現(xiàn)場(chǎng)動(dòng)平衡測(cè)量儀</span></span><span style="font-size:12pt"><span style="font-family:宋體">技術(shù)參數(shù) </span></span></strong> </p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">１.一般測(cè)量：</span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">轉(zhuǎn)速測(cè)量： 30～30,000 rpm </span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">振動(dòng)測(cè)量： 0.01～5000μm （峰峰值）</span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">0.01～2000mm/s （有效值）</span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">振動(dòng)分析： FFT 頻譜分析 </span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">顯示方式： 64X240點(diǎn)陣圖形液晶漢化菜單</span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">鍵盤：八鍵 </span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">２.動(dòng)平衡測(cè)量： </span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">測(cè)量點(diǎn)數(shù)：　　單測(cè)點(diǎn)或單面　　</span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">雙測(cè)點(diǎn)或雙面</span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">同頻工作轉(zhuǎn)速： 300～30,000 rpm </span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">同頻振幅量程： 0.01～5000μm （峰峰值）</span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">振動(dòng)烈度量程： 0.01～2000mm/s （有效值）</span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">相位精度： 0-360°±1 ° </span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">不平衡量減少率：　　　　≥８5％</span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">注： </span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">1) 選用超低頻磁電傳感器或電渦流傳感器測(cè)量振動(dòng)信號(hào)時(shí)可使同頻工作轉(zhuǎn)速降至30轉(zhuǎn)/分。 </span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">2) 當(dāng)設(shè)備工作轉(zhuǎn)速大于20000轉(zhuǎn)/分時(shí)，請(qǐng)另選購激光轉(zhuǎn)速傳感器。</span></span></p><p> </p><p><strong><span style="font-size:12pt"><span style="font-family:宋體">三、動(dòng)平衡測(cè)量中用戶關(guān)心的幾個(gè)問題</span></span></strong></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">3.1.動(dòng)平衡測(cè)量為什么首先選擇試重法</span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">本儀器是現(xiàn)場(chǎng)便攜式動(dòng)平衡儀，由于設(shè)備轉(zhuǎn)子尺寸，大小是不固定的。振動(dòng)</span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">傳感器與轉(zhuǎn)速傳感器的安裝位置也是不固定的，所以儀器的設(shè)計(jì)基本原理是通過加重的方法來尋找轉(zhuǎn)子不平衡的點(diǎn)。具體說，對(duì)于單面測(cè)量，要經(jīng)過二次振動(dòng)測(cè)量步驟，一次是原始振動(dòng)測(cè)量，另一次是加重后的振動(dòng)測(cè)量，才能找到不平衡點(diǎn)的位置。對(duì)于雙面測(cè)量，要經(jīng)過三次振動(dòng)測(cè)量步驟：一次原始振動(dòng)測(cè)量，另二次分別是在A面加試重后的振動(dòng)測(cè)量和B面加試重后的振動(dòng)測(cè)量，才能找到不平衡點(diǎn)的位置，看到動(dòng)平衡的效果。</span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體"> 3.2.為什么說影響系數(shù)法，可以省去加試重的步驟</span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">對(duì)于個(gè)設(shè)備轉(zhuǎn)子（新轉(zhuǎn)子），必須通過試重法得到一組影響系數(shù)。對(duì)于第二個(gè)設(shè)備轉(zhuǎn)子（老轉(zhuǎn)子）在保證新老轉(zhuǎn)子外形，尺寸，結(jié)構(gòu)都相同情況下，保證傳感器安裝位置不變的條件下，可以輸入影響系數(shù)進(jìn)行動(dòng)平衡，省去加試重的步驟，經(jīng)過一次振動(dòng)測(cè)量就能找到不平衡點(diǎn)位置。</span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體"> 3.3.儀器是如何將振動(dòng)測(cè)量矢量值轉(zhuǎn)變?yōu)椴黄胶饬渴噶恐?/span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">儀器測(cè)到振動(dòng)幅值有二個(gè)單位，一個(gè)是振動(dòng)速度值用mm／s表示，另一個(gè)用振動(dòng)位移值用u微米表示，兩個(gè)單位是通過“+1”鍵選擇的。一般用戶都應(yīng)用u微米表示：1mm=1000微米。振動(dòng)相角只僅表示振動(dòng)傳感器與轉(zhuǎn)速傳感器輸出信號(hào)相位差。然后儀器要求輸入試重的重量（克數(shù)）以及試重的位置（度數(shù)），儀器通過有沒有加試重前后兩次振動(dòng)矢量的變化，就可以將振動(dòng)矢量值（微米與相角）轉(zhuǎn)變?yōu)椴黄胶馐噶浚藬?shù)與角度）。從屏幕上看到M=xxg，Ф=xx°，既不平衡點(diǎn)的重量和角度，這才是用戶關(guān)心一組數(shù)據(jù)。</span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體"> 3.4.為什么說明書上技術(shù)參數(shù)沒有動(dòng)平衡精度指標(biāo)</span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">我們只生產(chǎn)動(dòng)平衡測(cè)量儀，被測(cè)對(duì)象是用戶提供的設(shè)備轉(zhuǎn)子，其設(shè)備轉(zhuǎn)子可能是進(jìn)口的，國產(chǎn)的，甚至是自制的。各種設(shè)備轉(zhuǎn)子的精度是不一樣的，差別很大，所以我們沒辦法制定同一的平衡精度標(biāo)準(zhǔn)。動(dòng)平衡測(cè)量精度取決于支撐轉(zhuǎn)子運(yùn)轉(zhuǎn)的設(shè)備精度等級(jí)，設(shè)備的精度等級(jí)越高，動(dòng)平衡測(cè)量精度也越高，說明書wei一的技術(shù)指標(biāo)不平衡減少率＞85%。意思是說，如原來設(shè)備轉(zhuǎn)子剩余不平衡量是10g（克），通過現(xiàn)場(chǎng)動(dòng)平衡操作，可以去掉8.5克重量，剩余不平衡量可以達(dá)1.5g（克）左右，這個(gè)指標(biāo)也是一個(gè)平均數(shù)。對(duì)于精度高，干擾小的旋轉(zhuǎn)設(shè)備轉(zhuǎn)子完達(dá)到這個(gè)指標(biāo)。對(duì)精度差，干擾大的旋轉(zhuǎn)設(shè)備轉(zhuǎn)子有可能達(dá)不到這個(gè)指標(biāo)。</span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體"> 3.5.為什么振動(dòng)的幅值和相角，大小有時(shí)會(huì)不停地變化</span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">在振動(dòng)信號(hào)測(cè)量中，振動(dòng)值與相角不穩(wěn)定是很常見現(xiàn)象。由于不平衡量引起的振動(dòng)是有周期性有規(guī)律的正弦波，正弦波信號(hào)是很穩(wěn)定。但是現(xiàn)場(chǎng)設(shè)備的振動(dòng)是很復(fù)雜的，一般來說是混頻振動(dòng)。包括各種振動(dòng)信號(hào)，只有在不平衡振動(dòng)分量占混頻總振動(dòng)量的80%以上，振動(dòng)信號(hào)幅值和相角才比較穩(wěn)定。振動(dòng)設(shè)備的幅值有10%的跳動(dòng)，相角有10度以內(nèi)的變化，就認(rèn)為振動(dòng)信號(hào)是穩(wěn)定的。如果不平衡振動(dòng)分量只占混頻總振動(dòng)量50%以下，振動(dòng)信號(hào)的幅值與相角就出現(xiàn)不穩(wěn)定現(xiàn)象。這時(shí)就要想辦法尋找干擾振動(dòng)信號(hào)的根源。如何查找設(shè)備轉(zhuǎn)子振動(dòng)故障，可以用本儀器的“信號(hào)分析”里的“FFT分析”功能，對(duì)于振動(dòng)信號(hào)進(jìn)行頻譜分析，通過譜線對(duì)應(yīng)分析出引起振動(dòng)的各種頻率成份。</span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體">振動(dòng)信號(hào)幅值和相角不穩(wěn)定，現(xiàn)場(chǎng)處理方法有：①振動(dòng)傳感器采用抗干擾性好的速度傳感器。②振動(dòng)傳感器安裝位置盡量靠近設(shè)備轉(zhuǎn)子的軸承座上。③將菜單中帶寬選擇，選到帶寬窄帶上。④如果設(shè)備轉(zhuǎn)子底腳沒有固定，要想法固定好。用橡皮墊起來隔振。</span></span></p><p><span style="font-size:12.0000pt"><span style="font-family:宋體"> 有一種現(xiàn)象需要說明：當(dāng)大設(shè)備轉(zhuǎn)子的振動(dòng)位量</span></span><span style="font-size:12.0000pt"><span style="font-family:宋體">＜10微米時(shí)</span></span><span style="font-size:12.0000pt"><span style="font-family:宋體">，當(dāng)小設(shè)備轉(zhuǎn)子的振動(dòng)位量</span></span><span style="font-size:12.0000pt"><span style="font-family:宋體">=1∽2微米時(shí)，振動(dòng)值和相角變化很大，這屬于正?，F(xiàn)象。因?yàn)檫@說明轉(zhuǎn)子的</span></span><span style="font-size:12.0000pt"><span style="font-family:宋體">動(dòng)平衡工作已經(jīng)做好。</span></span></p><p><font face="宋體"><span style="font-size:16px"><strong> </strong></span></font></p></div> <div id="pvhr3jx3r5" class="inside_newsthree"> <p id="newsprev">上一篇：<b class="newsprev"><a href="/Article-1805953.html">GD-110KV高壓交流驗(yàn)電器主要技術(shù)參數(shù)</a></b></p> <p id="newsnext">下一篇：<b class="newsnext"><a href="/Article-1798675.html">SCKF105微量水分測(cè)定儀主要技術(shù)特點(diǎn)及功能</a></b></p> <span><a href="/article.html">返回列表>></a></span> </div> </div> </div> </div> </div>    <div 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