The long-term production of hollow brick machines often results in various defects in the extrusion forming part, which can cause various reasons for production obstacles and directly affect the production quality and equipment life of hollow brick machines. During the production of hollow brick machines, there may be phenomena such as mud bar corner rot and heart rot. Rotten corners have cracks, with the tip of the crack flipping backwards; Rotten heart is a flower that blooms in the middle, rolls around, and protrudes from the middle of the mud stick. The main reason is that the extrusion speed of the intermediate mud is fast. The middle core head of the core tool can be extended or a mud blocking pipe can be installed on the core rod behind the core head to reduce the amount of mud entering the middle. You can also increase the curvature of the four corners of the feeding end at the machine inlet and increase the amount of mud entering the surrounding area. Similarly, if the mud stick is concave in the middle, it increases the amount of mud entering the middle and reduces the amount of mud entering the surrounding area. Mud bar bending refers to the bending of the mud bar towards one side when it comes out of the hollow brick machine mouth. The outer wall of the brick blank is thick on one side and thin on the other, mainly because the machine mouth, core tool, mud cylinder, and spiral reamer are not at the same point, and should be corrected in a timely manner. The second is that the mud bar moves forward in a zigzag shape, and the sunken areas are sometimes pulled apart. The main reason is that the top of the main and auxiliary blades of the screw reamer of the hollow brick machine is uneven, or the auxiliary blades are severely worn. The main and auxiliary blades of the screw reamer should be repaired or replaced. The reasons for the different forms of mud bar fractures are different. Lateral fracture is mainly caused by low moisture content during molding, and secondly, the plasticity index of the raw materials is too low. Therefore, it is necessary to strengthen the treatment of the raw materials, reduce their crushing strength, and increase their aging time. The occurrence of sawtooth fracture is due to large gaps in one or both sides of the water path at the corner of the second layer of the machine mouth, excessive lubricating water, and the formation of small tooth cracks with water; The second reason is that there is a lack of water in the back two layers of the machine mouth, and there is too much water in the front layer, resulting in large cracks with water teeth; Thirdly, there is only a lack of water at the corner of the second layer of the machine mouth, resulting in small tooth cracks without water; If there is a complete lack of water in all layers at the corner, it will result in water free large tooth cracks. The longitudinal cracks on the top surface of the mud bar are mainly caused by poor secondary bonding of the mud material. The end of the large blade of the core tool should have a reasonable length from the outlet plane of the machine mouth, which should be extended with the increase of the net mud output of the mouth. The deformation of the mud bar hole is due to the shrinkage of the hole, which may be due to severe wear of the core head or excessive indentation of the machine mouth. It should be replaced or adjusted. The second is the displacement of the hole, which may be due to the core rod being skewed or too thin. The core rod should be adjusted or replaced. The third is that some holes bloom in the middle and roll out in all directions. The reason is that the flat surface of the large head of the core exceeds the flat surface of the mud outlet of the machine, so the core head should be pressed in a bit with a nut. The fourth reason is the collapse and deformation of the hole, which is because the mud is too soft and the formed moisture should be adjusted. The extrusion part of the hollow brick machine is the key to the formation of brick billets. To ensure smooth operation, maintenance work of the brick machine needs to be done from all aspects to ensure production is flawless.
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