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在具有双向读数微分标牌和普通标牌的天平修理工作中,常常碰到这样一种情况:天平左右盘的分度值相等,但空载与垒载时的分度值却相差较大,而且当调整一个边刀的高低位置使空载与全载的分度值达到一致时,左右盘的分度值又不相等(俗称偏感)了。现在来探讨一下产生这个现象的原因。在对空载与全载的分度值进行调整时,一般是只调一个边刀,另一个边刀则保持原来位置不动。(因为有的天平只有一个边刀盒兼备升刀和降刀螺丝,调整方便;另一个则不然,调整起来很麻烦)。这样调整后,三刀刃线虽处在同一平面上,但却不水平,而是与水平面形成一个夹角φ,如图1所示。那末,三刀刃线不在同一水平面上,是不是引起天平左右盘分度值不相等的原因呢? 为了研究这一问题,在图2中设: 1.A、B,O分别为天平的两边刀和中刀,
In the case of balance repair with bidirectional reading differential signage and ordinary signage, a situation is often encountered where the graduation values of the left and right balances of the balance are equal, but the division degrees of the no-load and the barrier are quite different, and when Adjust the height of a side knife position so that no-load and full-load index reached the same, the left and right disc indexing values are not equal (commonly known as partial sense) of the. Now to explore the reasons for this phenomenon. In the empty load and full load index adjustment, the general is to adjust only one side of the knife, the other side of the knife to maintain the original position does not move. (Because some balance only one edge knife box both raise and lower knife screw, easy to adjust; the other is not the same, very troublesome to adjust). This adjustment, although the three blade line in the same plane, but not horizontal, but with the horizontal plane to form an included angle φ, as shown in Figure 1. So, the three-knife edge line is not the same level, is not caused by the scale around the disc division value is not equal to the reason? In order to study this problem, in Figure 2: 1.A, B, O, respectively, And knife,