Q: What is the working principle of a double-roll crusher?
Hydraulic Double Roller Crusher
A: A double-roll crusher works by using two parallel rollers that rotate in opposite directions. Material enters from the top feed opening and falls between the two rollers. As the rollers turn, the material is subjected to strong compression and shearing forces, causing it to crack and break into smaller pieces. The crushed material then discharges through the gap between the rollers. By adjusting the spring or hydraulic system, the roller gap can be changed to precisely control the output particle size. When an uncrushable object (e.g., a metal block) enters, the overload protection mechanism automatically opens the gap to let it pass, then resets to protect the machine from damage. This simple and reliable principle makes the double-roll crusher suitable for crushing medium-hard and soft materials such as salt blocks, pebbles, limestone, and coal gangue.
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