Rotation at the connection sleeve of the drill pipe

Open the leg control valve to slowly raise the legs, extend all levels of legs, close the leg control valve, retract the legs, and raise and lower the legs three times; Open the motor control valve to idle the motor and check the rotation of the motor; Simultaneously open the support legs and motor control valves to synchronize the lifting of the support legs with the rotation of the motor. Open the water control valve and observe whether there is water flowing out at the connection sleeve of the drill pipe.

When opening the hole, the operator opens the leg control valve to slowly raise the leg, and the drill bit reaches the top hole position. The water control valve is opened to supply water to the drill pipe, and then the motor control valve is opened to slowly rotate the motor, controlling the speed and propulsion speed for opening the hole; When the drill bit is 20~30mm into the rock, stop rotating. After the lead driller withdraws to a safe place, adjust the rotation speed and advance speed, and drill at the normal drilling speed;

After drilling, slowly rotate the motor and close the leg control valve. After confirming that the no-load test is normal, install the drill pipe and start drilling. The supporting legs fall back, and the drill pipe immediately falls down; After the supporting legs are fully retracted, close the motor control valve and then close the water valve. If the drilling depth of a drill pipe does not meet the requirements, a longer drill pipe should be replaced. Continue drilling according to the program until the hole depth meets the requirements.