A cone crusher with the following specifications is suitable for crushing hard river pebbles: cone angle 19–23°, eccentric shaft stroke 20–40 mm, shaft speed 220–350 rpm, reinforced construction, and hydraulic protection against foreign objects.
For crushing hard river pebbles, it is best to select a cone crusher with a cone angle in the range of 19–23 degrees, based on the engineering reference range.
According to measured data, durable river pebbles have a Mohs hardness of between 6 and 7, therefore the cone crusher must have a reinforced crushing chamber design to withstand constant loads when in contact with hard material
For effective crushing of river pebbles, the stroke of the eccentric shaft must be within the range of 20–40 millimetres in accordance with the official specifications; this parameter directly affects the degree of comminution of the material at the plant’s outlet
The recommended drive shaft speed for processing hard river pebbles is between 220 and 350 revolutions per minute, based on calculated values; if the upper limit of this range is exceeded, increased wear on the crushing chamber components is observed
Internal cone angle: 19–23 degrees (engineering reference range), Eccentric shaft stroke: 20–40 mm (official specifications), Drive shaft rotational speed: 220–350 rpm (calculated values), Required hardness of crushing elements: not less than 55 on the Rockwell scale (measured data)
Can a standard cone crusher be used to crush river pebbles? Standard models, which are designed for soft rock, cannot withstand the strain of crushing pebbles with a Mohs hardness of 6–7 on the Mohs scale and will fail after only a short period of operation. How does the size of the feed piece of pebble affect the choice of crusher model? According to official recommendations from equipment manufacturers, the maximum size of the feed piece should be no more than 85 per cent of the width of the crusher’s feed opening. Is it necessary to install additional protection systems against non-crushable objects when processing river pebbles? River pebbles often contain inclusions that are harder than the base material; therefore, the presence of a hydraulic protection system against foreign objects is a prerequisite for the stable operation of the plant in practice
