Pebbles refer to pebbles and river rocks. They are rock particles with a particle size greater than 5mm formed by natural conditions. During the formation process, they are transported and rounded by flowing water, so its quality is hard, the wear resistance is good, and it is difficult to crush. usually 2-3-stage crushing solution is commonly in river pebbles crushing, the whole production line is composed of vibrating feeder, jaw crusher, cone crusher, sand making machine, vibrating screen, sand washing machine, belt conveyor and other equipment.

The primary-stage crushing is equipped with a jaw crusher, which can crush large stones into medium-sized ones in preparation for entering the second-stage crushing.
Due to the high hardness of river pebbles, it is recommended to use a cone crusher with a inter-particle crushing principle for secondary crushing. At present, single-cylinder hydraulic cone crushers and multi-cylinder hydraulic cone crushers are widely used in river pebbles crushing. Compared with traditional spring cone crusher, hydraulic cone crushers adopts the latest technology and has many advantages, the operation and maintenance is much convenient, the control system is smarter and one-button start/stop is used which is easy for the user to operate the machine, due to the unique inter-particle crushing principle, the final product shape and the capacity are also greatly improved.

Why not choose a impact crusher or a hammer crusher as secondary crusher?
This is due to the working principle and the basic structure of the crusher. Both the impact crusher and the hammer crusher adopt the impact type and knocking type of crushing. Due to the high hardness and high silicon content of the river pebbles, the wear of the hammer plate and the hammer head will be aggravated. The hammer head basically needs to be replaced every shift, and the hammer plate can only last for 50-80 hours. Frequent replacement of spare parts is required, and the long-terms operation and maintenance costs are high.
After the secondary crushing stage, different sizes such as 5-10mm, 10-15mm, 15-20mm, and 20-31.5mm can be screened out.

The vertical shaft impact crusher is usually used for the tertiary crushing stage, which can be used not only for aggregates shaping, but also for the production of artificial sand, the main products of vertical shaft impact crusher is artificial sand which size below 5mm.

This is the classic host configuration of a river pebble crushing production line. In addition to the main crusher, it also needs to be equipped with vibrating feeder, vibrating screen, sand washing machine, belt conveyors and other relative supporting equipment.