In addition to the natural excellent mechanical indicators of high-quality stone materials for road paving, the main particles are cubic and angular after crushing. Only in this way can we ensure the tight bonding between the stone materials and improve the overall strength of the pavement. In addition, the outer surface of the stone is multi-angular, the surface texture is rough, the specific surface area is large, and the adhesion with the asphalt is stronger, and the strength and durability of the road surface will be better. For the whole production process of Kaishan ore, it is mainly to control the flatness of the finished material. The content of long-shaped and prolate particles can ensure the overall quality of the product is qualified. According to the production experiments and practices of crusher experts, it is believed that only by controlling the entire production process from the following aspects can high-quality stone be produced.

1. Crushing ratio: The crushing ratio is the ratio of the particle size of the imported material to the crushed finished product. The larger the ratio, the greater the crushing ratio, and vice versa. The crushing ratio increases, and the needle flake content increases. Moreover, this rule is not only applicable to jaw crushers, but also to cone crushers. It has nothing to do with the type of crusher, but if the crushing ratio is too small, the output of the entire system will decrease. , the amount of internal circulation increases, the wear of the crusher increases, the economy is poor, and the production efficiency is low. Therefore, it is very important to choose an appropriate crushing ratio in the entire production process.

2. Feed particle size: When the feed particle size is reduced from 100mm to 50mm, the needle flake content in the finished material decreases by 38%.

3. Cycle load

In a closed-loop production process, if the discharge port is enlarged and the load in the cycle is increased, the particle shape of the stone will become better. In the whole process, due to the increase in the cycle load, the wear of each equipment in the system will increase, but when the discharge After the mouth is adjusted larger, the load of the main crushing motor can be reduced, and the shape of the finished material becomes better.

4. Open and closed loops

In the secondary crushing process, the circulation is divided into circuit circulation and closed circuit circulation. The former is called first sieving and then crushing, and the latter is called first crushing and then sieving. After sieving, it enters the secondary crushing inlet for crushing, so that the output of finished materials increases, and the content of needle flakes also increases. Crushing first and then screening means that all the primary crushed material enters the feed port of the secondary crusher, and then enters the finished product sieve for secondary crushing. The whole system is a closed system, there is no loss of crushed material, and the cycle load is relatively large. , but the product has a good grain shape.

In addition, through practice, it is found that the particle shape is the best when the discharge port is adjusted to be consistent with the particle size of the finished material. The needle flake content is lower when the discharge port is larger than the particle size than when the discharge port is smaller than the particle size. This is because the discharge port is small for the same feed port; the crushing ratio is large; so the particle shape becomes poor; in addition, constant supply The raw material is also the key to improve the quality of the finished material. Unstable and insufficient material supply makes the stone material in the crushing cavity affected by the inner lining plate and the outer lining plate, and it is easy to form needles and flakes. The material in the crushing chamber will be laminated and crushed, forming extrusion crushing and grinding between materials, and the particle shape of the finished material will become better.