In the impact chisel system with joints, the drill tail, drill rod (Group) and drill head are connected into a drill tool group through GS or MF joints to transmit the impact energy and torque of the rock drill. The tail end of the drill rod is fixed in the rotary sleeve of the rock drill. It bears the impact of the piston and the torque of the rotary drill. The other end is connected with the drill head and collides with the rock in the blast hole.

When the piston strikes the end face of the drill tail The piston has an axial force acting on the drill rod, and the rock has a reaction force transmitted to the drill rod through the drill head. At this time, the drill rod bears axial compressive stress. When the piston retreats, the axial compressive stress of the drill rod disappears, but at the same time, the drill rod will also bear the axial tensile stress due to the change of the soft and hard rock and the reflection condition of the stress wave. These two axial alternating stresses in the form of stress waves are the main factors causing the failure of drill rods.

During the impact between piston and drill tail, drill head and rock, drill sleeve and drill shoulder Due to impact vibration, asymmetric impact, eccentric resistance of rock drilling, oblique component force and self gravity of drill rod when drilling holes in different positions and directions, and bending degree of drill rod itself, the axis of rock drill and drill rod are connected.

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