Меры предосторожности при изготовлении пустотелого глиняного кирпича
Летом, with the change of climate, the moisture content in raw materials fluctuates, so pay close attention to the change of moisture content in production. When the moisture content is low, it is necessary to add water to the raw material in time to make it reach the moisture required for molding. When the moisture content in the raw material is too high, it is necessary to properly reduce the moisture content in the raw material. It can be reduced by adding some dry materials to the raw material, such as dry fly ash, угольная банда, шлак, tailings of other mines and other industrial waste slag. When adding these components into the raw material, it is necessary to select the right time and specify the adding position. It must be added at the crushing position of the raw material. Таким образом, добавленные компоненты могут образовывать хорошую смесь с основными компонентами сырья, чтобы сделать характеристики сырья однородными. Если добавление времени слишком поздно, а затем добавить после того, как сырье сломано, тогда производительность сырья неравномерна, потому что несколько материалов не могут быть полностью смешаны, Формовочные работы не могут быть выполнены гладко. То есть, формование может осуществляться, но качество формируемого зеленого тела тоже крайне нестабильно. При добавлении воды к сырью, it is also necessary to pay attention to the time of adding water. It is necessary to add 98%~100% of the water required for raw material molding when raw materials are broken and crushed, so that the water content of raw materials can meet the requirements of molding water. Don’t wait until the raw material enters the extruder to add water, which is too late to ensure that the added water is evenly dispersed in the raw material, and the water content on the surface and inside of the particles will also be greatly different, which is not conducive to the consistency of the raw material performance, and will cause certain harm to the molding and green body performance.
In terms of lubricating water at the machine mouth, attention should also be paid to the amount of water added. Under the condition of ensuring normal molding, water should be added as little as possible. Although molding can also be carried out with more water, this will make the surface of the green body absorb too much water, which will have a certain impact on the drying process of the green body and the uniformity of the green body performance. It is inevitable to form delamination phenomenon in the forming body by using the screw extruder, which is generally called spiral striation. This texture (layering) is formed by the uneven extrusion of mud from the machine mouth section through the spiral blade. When raw materials are formed into mud strips, мы надеемся увеличить плотность зеленого тела за счет тесного сочетания частиц, а не под действием смазок. По принципу максимально плотной упаковки сырья, когда доля каждого компонента в грубом, средние и мелкие частицы сырья распределяются по “большие с обоих концов и маленькие посередине”, плотность зеленого тела наибольшая, то есть, частицы могут достигать самой плотной упаковки. All particles with one particle size can not achieve good forming effect, and when the proportion of each component is out of balance, it can not achieve good forming effect, and it is easy to produce delamination during forming.
