china bricks machinery
What is the reason for the poor quality and fragility of bricks?
There are many reasons for the bending of bricks, and the main reason should be mechanical problems. Such as the spiral cutter of the extruder (especially the structural form of the spiral cutter head), machine head, machine mouth, billet cutting table, billet conveying belt, etc.
The second reason may be that the molding moisture is too high and the strength of the billet is too low;
Thirdly, it may be due to the presence of too many low melting point substances in the body of the billet, which forms a large amount of liquid phase during calcination and deforms under the pressure of the upper body, causing it to bend. Because each type of material contained in the body has a specific reasonable body height limit, which is called the reasonable body height.
The rough surface of the brick is mainly caused by insufficient processing of raw materials and coarse particles in the body material.
The quality of bricks is always poor and fragile, and the first thing to check is whether the performance of the raw materials meets the requirements of sintered bricks. If the clay minerals contained in the raw materials are too few or the montmorillonite content is too high, it can also lead to poor product quality and fragility;
Secondly, one should carefully check the performance of the extruder they are using. The poor quality of the billet extruded by the extruder can also cause the product to be fragile;
Thirdly, review whether the chosen process is reasonable. For example, inadequate processing of raw materials can also lead to poor product quality.
There are two main reasons for the collapse of the pre tropical slab:
① The pre tropical zone is too short, the temperature rises too quickly, and the temperature and humidity are too high;
② The billet entering the kiln is not completely dry.
The solution is as follows:
① If the preheating zone is too short, it should be considered from the design of the kiln: appropriately extend the preheating zone. If the original design is not long enough, the fire of the firing zone can be moved back in operation, which can appropriately extend the length of the preheating zone.
At the same time, in the design, a moisture exhaust fan should be added to the preheating zone to remove the moisture from the preheating zone.
② Strengthen the drying intensity of the drying kiln: to ensure that the billets pushed out from the drying kiln are completely dry. (Can preserve 5-7% residual water in seedlings). When checking the billet that comes out of the drying kiln, it is necessary to check whether the center of the kiln car is completely dry. Often, the surface around is dry, but the temperature in the middle is still high, which is the main reason for the pre heating inverted billet.
③ Change the encoding method and control the encoding density.
The more suitable density for the preform should be: 230-260 blocks/m3. And it should follow the principle of medium sparsity and dense edges. Especially the middle passage should be left larger to ensure proper ventilation and moisture removal.