只有在无法使用其他方法（如从自由落体中自动取样勺取样）时，才应使用该方法，或作为参考方法。它包括将两块平行的板或金属板垂直向下插入材料流中，并与停止皮带的轴线成直角，然后移除板或板之间的材料。

The method should be used only where other methods, such as automatic sampling of scoop sampling from a free fall, are impossible, or as a reference method.It consists in inserting of two parallel boards or metal sheets vertically down into and at right angles to the streams of the material and to the axis of the stopped belt, and removing of the material between the boards or sheets.