Factors Influencing the Product Shape of a Cone Crusher

The cone crusher is a commonly used crushing equipment with a wide range of applications, typically employed in industries such as metallurgy, mining, water conservancy, and construction. It plays a crucial role in production processes. The product shape is a primary indicator of product quality. In application fields, the needle-like and flake-like particles produced by the cone crusher must meet certain standards, making control of product shape essential. The primary working material for cone crushers is mineral ore, and the particle shape (geometric shape of the material particles) is a key indicator for evaluating the quality of the crushed product, typically classified into cubic and needle-like shapes. What are the factors influencing the particle shape of cone crusher output?

1. Main shaft speed  

For cone crushers, they are primarily used as secondary crushers in production. They process materials using the principle of compression crushing, resulting in low needle-like particle content in the final product. However, when materials are in the crushing chamber, the needle-like particle content first increases and then decreases.

As material passes through the crushing chamber of the cone crusher, the needle-like particle rate increases rapidly with the occurrence of compression crushing events, reaching a certain level before gradually decreasing. Based on relevant domestic and international research, it has been found that before entering the crusher, material undergoes screening or particle size separation processes, resulting in a more uniform particle size; Upon entering the crushing chamber, the material undergoes compression crushing, resulting in the formation of needle-like and flake-like particles. As more material particles undergo compression crushing, the content of needle-like and flake-like particles increases rapidly. When compression crushing events further increase, some material particles, including needle-like and flake-like particles, begin to undergo secondary or multiple compression actions. In the latter half of the crushing process, the needle-like and flake-like particle content in the crushing chamber decreases and returns to an ideal range.

It can be seen that during the operation of the cone crusher, the increased frequency of compression crushing events helps reduce the content of needle-like and flake-like particles in the crushed product. Therefore, increasing the main shaft speed can improve the particle shape quality of the crushed product to a certain extent.

It can be concluded that measures such as increasing the main shaft speed, improving the structural parameters of the crusher, and increasing the occurrence rate of crushing events (number of repeated crushing cycles) in the crushing chamber are effective ways to improve the particle shape of the crushed product.

2. Production line configuration

Poor aggregate particle shape and high content of needle-like and flake-like particles indicate issues with the configuration of the aggregate processing production line. As is well known, crushers based on the compression principle result in poor aggregate particle shape, while crushers based on the impact crushing principle produce good aggregate particle shape. Therefore, for the crushing of soft rocks, a combination of a jaw crusher and an impact crusher (for shaping) is sufficient to achieve aggregate particle shape that meets the requirements of a mixing plant.

In fact, most particle shape issues in aggregate processing production lines arise during hard rock crushing. Hard rock crushing imposes high demands on the wear parts of crushers; using impact crushers results in excessive wear part consumption. While using cone crushers reduces wear part costs and ensures sufficient production time, they produce aggregate with high needle and flake content and poor particle shape. Therefore, we recommend selecting a multi-cylinder hydraulic cone crusher and adding a shaping machine for shaping.

However, for cone crushers, although certain methods can be used to improve the quality of the final product particles, their inherent characteristics mean that the quality of the final product particles is not as good as that of impact crushers but better than that of jaw crushers, making them of medium quality.

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