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材料試驗機示值誤差的調(diào)整

時間:2011/10/18閱讀:589
分享:
      材料試驗機示值誤差的調(diào)整液壓式材料試驗機是力學(xué)計量檢定中經(jīng)常遇到的儀器,JJG139-1999檢定規(guī)程中要求其示值允許誤差通常不超過±1%,計量部門對其進行計量檢定時,其示值誤差主要通過以下幾種方式體現(xiàn):  
一、示值正偏差超差。  
二、示值負(fù)偏差超差?! ?/div>
三、示值誤差在度盤上呈現(xiàn)“前正后負(fù)”或“前負(fù)后正”且個別點超差?! ?/div>
針對以上情況,筆者認(rèn)為該作如下調(diào)整:  
        *種情況:在確認(rèn)儀器安裝水平度符合規(guī)程要求后,首先要檢查工作部分的摩擦力是否過大,如果是,應(yīng)調(diào)整導(dǎo)輪間隙,消除摩擦力,必要時清洗工作油缸,如排除摩擦力影響后仍然存在正差,則應(yīng)將測力部分(讀數(shù)機構(gòu))中的擺桿與推板連結(jié)軸套的緊固螺釘松開,將推板向內(nèi)側(cè)調(diào)整,固緊緊固螺釘后,由小度盤逐級檢定,反復(fù)數(shù)次,直至檢定合格,如果小度盤合格,而大、中度盤仍超差時,應(yīng)適當(dāng)增加B鉈及C鉈的重量,直至檢定合格。  
        第二種情況:應(yīng)首先檢查測力活塞是否安裝正確,摩擦力是否過大,排除此原因后,將推板向外側(cè)調(diào)整,將小度盤調(diào)整合格,如大、中度盤仍超差,應(yīng)適當(dāng)減輕B鉈及C鉈的重量,直至檢定合格?! 〉谌N情況:此時應(yīng)改變推板與齒桿頭接觸面的角度,該接觸面通常是用一塊平整的鋼片通過上下兩個螺釘固定在推板表面,調(diào)整方法是將兩個螺釘松開,用銅皮或者其他輕薄的金屬片墊在鋼片與推板之間的上側(cè)或下側(cè)(只能墊在一側(cè)),借以改變角度,反復(fù)檢定調(diào)整后直至合格。

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