| 摘要 |
PURPOSE: A rock splitter having extendable protrusions is provided to extend the lengths of protrusions by inserting sub protrusions into main protrusions and protruding the sub protrusions from the main protrusions using hydraulic pressure. CONSTITUTION: A rock splitter having extendable protrusions comprises a main body(10) and protrusions(20). The main body is inserted into an insertion hole formed in a rock bed and crushes the rock bed. The main body has multiple insertion units. The protrusions are inserted into the insertion units of the main body and are protruded from the main body. Each protrusion has a main protrusion(22) and a sub protrusion(25). The main protrusions are inserted into the insertion units of the main body and are vertically moved. The sub protrusions are inserted into the main protrusions and are vertically moved.
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