Summary：In artificial sand making industry, vertical shaft impact crusher, also known as sand making machine, is widely used as the main sand making equipment. There ar

In artificial sand making industry, vertical shaft impact crusher, also known as sand making machine, is widely used as the main sand making equipment. There are two kinds of crushing methods of sand making machine: “rock on rock” and “rock on iron”. But, many people don’t know the differences of these two crushing methods very clearly. In this article, we mainly introduce the 2 crushing methods of sand making machine and their comparison.

Comparison Of Applicable Situations

Generally, “rock on rock” crushing method is used for shaping and “rock on iron” crushing method is used for sand making.

The “rock on rock” crushing method is suitable for crushing abrasive materials with medium hardness and above, such as basalt etc. During the crushing process, materials injected from the impeller impacts the material liner and do not directly contact the metal components of sand making machine, reducing iron consumption and thus reducing maintenance time. The shape of the finished products is good under the crushing method of "rock on rock".

The “rock on iron” crushing method is suitable for crushing abrasive materials with medium hardness and below, such as limestone etc. Under the “rock on iron” crushing method, sand making machine has high efficiency.

Comparison Of Their Working Principles

2 crushing methods of sand making machine

Sand Making Machine (also known as "Sand Maker") has two feed modes – "feed at center" and "feed at center & sides". Generally, “feed at center” feed mode is used in “rock on iron” crushing method. In this condition, the vertical shaft impact crusher is used for sand making and has low production capacity. “Feed at center & sides" is used in “rock on rock” crushing method. In this condition, the vertical shaft impact crusher is used for shaping and has high production capacity.

Comparison Of Main Wear-Resistant Parts

Sand making machine with “rock on rock” crushing method and sand making machine with “rock on iron” crushing method has different main wear-resistant parts.

Under the crushing method of “rock on rock”, materials form a material layer around the impact block and the materials impact on the material layer and are crushed. So, the main wear-resistant part of sand making machine with “rock on rock” crushing method is impact block.

Under the crushing method of “rock on iron”, the impact block is replaced by around protecting plate, and the materials directly impact on the around protecting plate and be crushed. So, the main wear-resistant part of sand making machine with “rock on iron” crushing method is around protecting plate.