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笔者曾于本刊1983年第三期中阐述了摩擦力及皮带张力对皮带秤计量精确度的影响,本文再谈谈离心力对皮带秤计量精确度的影响。具有现场经验的人都了解,在皮带机现场,当皮带上料较多,由于皮带具有一定弹性,在物料重力及皮带自重的作用下,皮带在托辊与托辊的空档间会出现下凹现象,如图1所示。即皮带有一定垂度。皮带下凹近似于抛物线,但因下凹很小可近似看作圆弧曲线。为了便于分析,我们假定取皮带上的一小段物料为G。大家知道,当一个物体沿着一个下凹弧面运动时,除有自身重力作用外,还有一个离心力在作用。即传感器所承受的力,除这小段物料重量G外,还有一个离心力F′的作用,如图2所示。其离心力的大小
In the third issue of 1983, the author described the influence of friction and belt tension on the accuracy of the belt weigher. This article will talk about the influence of centrifugal force on the accuracy of the belt weigher. People who have on-site experience understand that when the belt is on the belt conveyor, when the belt is loaded more, due to the elasticity of the belt, under the action of the material gravity and belt weight, the belt will appear under the neutral of the roller and idler Concave phenomenon, shown in Figure 1. The belt has a certain degree of dip. Belt concave similar to a parabola, but because of the small concave can be approximated as a circular arc curve. For the sake of analysis, we assume that a small piece of material on the belt is G. We all know that when an object moves along a concave arc, in addition to its own gravity, there is a centrifugal force in the role. That is, the sensor is subjected to the force, in addition to this short piece of material weight G, there is a centrifugal force F ’role, shown in Figure 2. The size of its centrifugal force