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方形大小口(如附图)是电站锅炉以及其他热机设备常用的部件。通常要在它的菱角处加补强角钢,补强角钢的角度要等于附图中ff剖面图的β角(90<β<180°)。工人同志把求β角的手续叫做“劈八字”,一般的都是用展开画法来求,手续复杂麻烦,很费时间。我们和现场工人同志实际接触中深深地感到这种方法的不方便。经过研究整理出两个计算公式。用公式可以简便的计算出β角的度数。比用展开画法省事,并且得的结果精确。现把公式介绍如下。
Square size port (Figure) is a commonly used components of power station boilers and other heat engine equipment. It is usually necessary to add a reinforcement angle to its water chestnut. The angle of reinforcement should be equal to the angle β (90 <β <180 °) of the ff section in the figure. The worker’s comrade called the procedure of seeking the beta angle “Piqibazha”, and they all usually use the method of expansion to draw up. The procedure is complicated and troublesome, which takes a lot of time. We feel deeply inconvenience of this method in the actual contact with the field workers. After research sorted out two formulas. Using the formula can easily calculate the degree of beta angle. Save yourself by using the spread method, and the result is accurate. The formula is as follows.