Due to the rapid development and progress of domestic highway construction in recent years, intermittent asphalt mixture mixing equipment has become an indispensable key equipment in contemporary highway construction. As the core component of intermittent asphalt mixture mixing equipment, the batching system must have basic conditions such as high control accuracy, good time response characteristics, and strong stability. The factors that affect batching accuracy mainly include the vibration of the hopper Overimpulse and drop.
When confirming the model and parameters of the asphalt mixture crushing and screening equipment, it cannot be determined based on the size of the material. Instead, it is necessary to first determine the main parameters such as production efficiency, product specifications, and shape before determining the size of the rock material. In addition, we can also control the size of materials to meet the requirements of the crushing and screening system by adjusting the parameters and selection methods of the crushing and screening equipment. Based on the analysis and comparison of crushing costs, it can be found that increasing the size of rock materials can effectively reduce costs, but it will reduce the production efficiency of crushing and screening, increase the wear of vulnerable parts such as jaw plates and lining plates, especially for materials with hardness and medium hardness, the cost reduction is much higher than the cost increase of crushing. Therefore, only by strictly controlling the specifications and dimensions of materials can economic costs be effectively reduced.
The crushing methods of asphalt mixture crushing and screening equipment are generally divided into the following five types:
1. Crushing: When a rock material is subjected to pressure between two planes, its internal pressure will exceed its original compressive strength and break.
2. Splitting, under the action of the splitting tip, the rock material will generate tensile stress. When the tensile stress exceeds the original tensile strength, fragmentation occurs.
3. Fragmentation: Under the action of multiple intersecting forces, rock materials will be subjected to stress such as shear and bending. When these stresses exceed a certain limit, the stone will be cut or bent and broken.
4. Crushing: After the material is impacted, significant impact stress will be generated internally, causing it to shatter. During the crushing process, the forms of impact stress include complex forms such as compression, shear, and bending
5. Rolling, the rock material will rub between two planes, causing the direction of pressure on the stone material to constantly change. When the pressure acts on the weak surface, the stone material will be crushed.
Generally, splitting and breaking methods are used for hard rocks; For ductile and viscous rocks, crushing and crushing methods are used; Brittle rocks are suitable for using the method of crushing.
