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                  如何輕松解決材料試驗機的故障問題

                  作者:武漢國量儀器 來源:http://www.www.pequemuestra.com/ 日期:2019-04-17 09:28:32

                  材料試驗機采用松下電機及調速系統一體化結構驅動皮帶輪減速系統,經減速后帶動精密絲杠副進行加載。電氣部分包括負荷測量系統和位移測量系統組成。所有的控制參數及測量結果均可以在計算機屏幕上實時顯示,可計算試樣的彈性模量、抗拉強度、斷后延伸率等參數。并具有過載保護等功能。

                  如何輕松解決材料試驗機的故障問題?

                  常見故障解決方法

                  一、主機不啟動

                  1、排除電源線故障。檢查電源線是否接上,電源線連接是否正確、牢固。

                  2、檢測380V三相電源插座是否缺相,電源線是否脫落。

                  3、檢查急停按鈕是否被按下。

                  4、檢查限位開關是否開啟。

                  5、檢測開關電源工作是否正常。測量開關電源各輸出點的電壓是否滿足拉力試驗機要求。

                  二、度盤指針靈活性差,卸荷后出現中途中止現象,或者零點位置經常變動

                  1、齒桿上的滑輪及其道軌灰塵過多、銹蝕。此時需求卸下清洗潔凈,再加少許鐘表油。

                  2、指針轉動軸臟,應清洗。

                  3、齒桿壓片和齒桿之間有接觸,應調松。

                  4、緩沖器回油狀況不良,應加以調整或清洗。指彎路有所梗塞。

                  5、測力活塞上的皮帶零落或太松使活塞不能勻速運轉。

                  6、測力活塞在油缸內摩擦力增大或卡死現象,應用氧化鉻研磨膏對研,直至正常為止。

                  7、擺錘在揚起過程中有障礙物,或者擺軸太臟或銹蝕,使指針回零變動大。

                  三、顯示超載

                  1、檢查計算機于試驗機主機間的線是否連接正常。

                  2、傳感器在聯機的時候是不是選擇錯誤了。

                  3、在操作鍵盤或者上次實驗時傳感器是否碰撞過。4、是否在之前使用了軟件的校準功能。

                  5、檢查是否手動更改過校準值、標定值或硬件參數中的其他信息。

                  四、加載過程中卸載(比較常見,原因較多)

                  1、送油閥阻尼針與阻尼孔間隙過小。每次加載只能達到一定負荷,當負荷不能再上升時,送油閥回油管出油量大。這時候需要取出阻尼針,沿阻尼針軸向用銼刀適當銼去一部分。

                  2、油泵柱塞銹蝕,導致在加載過程中,送油閥回油管出油不連續或有波動。到某一負荷不能再上升時,回油管無油流出。碰到這類情況維修時要考慮取出柱塞重新拋光。

                  3、油箱油量不足也可能導致上述故障。當試驗機加載到一定負荷,送油閥回油管有 噗 、 噗 聲響,且出油少、有氣泡。當負荷不能再上升時,回油管無油流出。往試驗機油箱內加油,直至看到油液面達到視油窗一半即可排除故障。

                  4、當安全閥調節不當,或閥尖與孔封閉不嚴也會導致上述故障。排除方法拆卸安全閥調節螺釘,檢查零件損壞情況進行調換,超載過多,將螺釘向下旋,反之向上旋。

                  5、間隙溢油過多,可以從溢油等出口看到。加厚油液的黏度,如果還不能解決問題,經過精密測量后,應到生產廠調換活塞和油缸。

                  6、帶動油泵的皮帶松動,有打滑現象。加載到某一負荷后不能再上升,送油閥回油管無油流出,油泵無工作聲。維修方法 松開電動機固定螺絲,調整好位置,使皮帶拉緊,再將電動機固定螺絲擰緊。若皮帶變形太大,就得更換新的皮帶。

                  7、測力活塞與測力油缸間隙大。當打到高噸位時,可以從測力油缸下部看到。正常情況是看不到滴油或高噸位時有間歇滴油,如果成線狀流出,說明測力活塞應更換。在觀察漏油時,應注意接頭漏油和缸塞漏油的區別,且不可由于錯看而得出錯誤的判斷。

                  8、用油黏度太低導致加載時送油閥回油管一直有油流出而引起故障。解決方法:一般采用中等黏度的礦物油,不含水、酸及其他混合物,常溫下不分解,不變稠,必要時可用黏度計測量。如果用油不當,會使閥門和油路堵塞,并可能引起振動或管路泄露。應按說明書的要求用油。

                  9、送油閥穩壓彈簧剛度低或節流針空腔有堵塞,該故障導致每次加載只能達到一定負荷,當負荷不能再上升時,回油管出油量大,這時候該考慮更換剛度適宜的穩壓彈簧或清洗臟物。

                  10、油壓系統嚴重漏油。主要表現 油路系統漏油一般都出現在緩沖閥、回油閥、送油閥、油泵及管路的連接處。排除方法 加墊后擰緊螺絲即可。若是密封墊片壞了,就必須拆開此處更換新的。墊片應有紫銅或鋁合金制成。

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