The utility model discloses a one-key rod changing
system based on an SD65 down-the-hole
drill, which comprises a propelling beam, an
encoder arranged at the top of the propelling beam, a propelling
hydraulic cylinder arranged inside the upper end of the propelling beam, a rotary
hydraulic motor arranged on the propelling beam, a
gyrator connected onto the rotary
hydraulic motor, a buffer, a transition joint and a
drill rod connected onto the
gyrator, the propelling beam is provided with a rod replacing
assembly used for adding and detaching rods, and the lower end of the propelling beam is provided with a connecting
assembly used for connecting or detaching the two
drill rods. Through a series of actions of the connecting
assembly, the overturning
hydraulic motor, the clamp holder and the hydraulic slewing mechanism, the
proximity sensor is used for accurately positioning, the
encoder is used for reading a displacement value, and the electric-hydraulic proportion of a rotating oil way and the electric-hydraulic proportion of a propelling oil way are used for controlling the smoothness of connecting a drill rod and withdrawing a drill thread in a matched mode. Connection or separation of the drill rods is completed through mutual cooperation, one-key rod replacement without manual operation is achieved, working efficiency is improved, cost is reduced, and safety is improved.