News information
Treatment of the phenomenon of "enucleation of heart brick"
07-02
This means that crescent-shaped holes or arc-shaped cracks appear in the middle of ordinary solid brick blanks. All holes and cracks penetrate through the brick body. Almost all brick blanks are the same. The surfaces of open holes and cracks are smooth. It seems that when extruding brick blanks, the middle part is not supplied enough. When the molding moisture is increased, the problem disappears, and once the molding moisture is reduced, it reignites.
As mentioned before: in the extruderThe mud is pushed forward by the blades of the rotating spiral reamer, and the part occupied by the shaft sleeve of the spiral reamer is free of mud. Therefore, in the mud tank of the extruder, the mud is not a solid "mud rod", but a hollow "mud pipe". It is not until the mud pipe breaks away from the spiral reamer and enters the mud around the head that the mud material squeezes to the middle to fill the space left by the spiral reamer sleeve. If the shaft sleeve is too large and the effective extrusion section of the reamer blade in the mud tank is too small, the mud material of the "mud tube" will fill the space left by the shaft sleeve of the reamer, or will be squeezed out of the machine mouth before it can fill the space in the middle, which will inevitably lead to "enucleation of the core brick".
Since the water film wrapped on the surface of the mud particles is the lubricant of the mud in the mud tank, the flow of the mud is accelerated after the water content of the molding is increased. Under the same conditions, the mud around the mud pipe is easier to rush to the middle, fill the vacuum, and the phenomenon of enucleation is gone.
The only way to deal with this problem is to add more water to improve the moisture content of the brick. Of course, this will not only increase the burden of drying, but also may affect the strength of the brick to a certain extent.
The permanent solution is to appropriately extend the length of the machine head so that the mud around the mud pipe has enough time to squeeze into the middle to fill the vacuum, but this will definitely increase the extrusion energy consumption, and also improve the compactness of the brick, which is helpful to improve its strength. The second is to reduce the outer diameter of the spiral reamer sleeve as much as possible and increase the effective extrusion area of the reamer blade in the mud tank as much as possible to makeThe mud layer of the "mud pipe" is thicker, more mud is extruded, and the hole of the mud pipe is smaller. It's easier to fill up.
In fact, in the extruderIn, only the first section of the spiral reamer is responsible for overcoming all the resistance of the machine head and the machine mouth, turning the mud extruder mouth into a mud strip, which bears the largest thrust and torque, and its reamer shaft sleeve must also have a certain thickness. fortunately, the first section of the spiral reamer is installed at the front end of the reamer shaft with a small shaft diameter, and the wall thickness of the shaft sleeve is completely enough under the condition that the outer diameter is unchanged, the rest of the spiral reamers are mainly "transportation battalion chiefs" and bear a small amount of extrusion tasks. The thrust and torque they bear are not large, so their shaft sleeves do not need to be much thick.
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