Aiming at the problem that rotary roofbolters are not suitable for hard terrane,the valveless hydraulic impact-rotary driving head of roofbolter was proposed.

• 针对旋转式锚杆钻机不适用于坚硬岩层的问题,提出了无阀液压冲击旋转型锚杆钻机动力头结构。