The crushing ratio of crusher

The ratio of the raw material particle size to the finished material particle size after crushing is referred to as the crushing ratio, which directly affects the energy consumption and processing capacity of the crusher and is a key factor in measuring the crushing effect of the crusher. There are three commonly used methods for calculating the crushing ratio, and different crushing ratio calculation methods have different applicable objects.

1. Maximum crushing ratio: the ratio of the maximum block size before and after crushing

Because it is necessary to select the width of the crusher feed port according to the maximum material diameter, this method is often used in mineral processing plants, quarries, and engineering designs.

However, different countries have different habits, and the maximum particle size straightening method is also different. In the United Kingdom and the United States, the sieve hole width that 80% of the material can pass through the sieve hole is the maximum particle size diameter, and in my country, the sieve hole width that 95% of the material can pass through the sieve hole is the maximum particle size diameter.

2. Surface crushing ratio: the ratio of the feed port width to the discharge port width of the crusher.

Since this method does not require screening and analysis of a large number of materials, it is convenient to make an approximate calculation by knowing the feed port and discharge port width of the crusher, so it is more commonly used in production. However, it is worth noting that not all crushers' discharge particle sizes are determined by the size of the discharge opening.

3. Average crushing ratio: the ratio of the average particle size of the material before and after crushing.

Scientific research and theoretical research often use the average particle size to calculate the crushing ratio, because this method can more realistically reflect the operation of the equipment and the degree of crushing. The average crushing ratio of a general crusher is between 3-30, and the crushing ratio of a grinding mill can reach 40-400 or more.

The larger the crushing ratio of the crusher, the corresponding needle-like content will increase, and this is true for all types of crushers; but if the crushing ratio is too small, it will cause the entire stone crushing production line to reduce output and increase the internal circulation volume, thereby increasing the wear of the crusher and reducing the overall economic benefits. Therefore, in the entire stone crushing production process, it is very important to choose a suitable crushing ratio. Usually, the first crushing equipment selects a jaw crusher with a large crushing ratio, and the secondary crushing equipment selects an impact crusher or cone crusher with a relatively small crushing ratio.