Reasons for the slow drilling speed of pneumatic drilling rigs and troubleshooting:

① Insufficient thrust of the cylinder: The compressed air pipeline exceeds the rated load, the leakage of the pipeline, and the wear of the valve cause low working air pressure and insufficient cylinder thrust.

②The drill rod specifications are unqualified or have been bent and deformed: check whether the drill rod is bent, if it is bent, it should be straight before use; check whether the drill bit specifications are correct, and use a drill bit of appropriate specifications. Check whether the drill bit is sharp, use a sharp drill bit; if the drill pipe hole is blocked, check and clean the drill pipe hole.

③Insufficient water supply: the water valve of the drilling rig cannot be fully opened, and the water flow is not smooth; the water source pressure is low, and the water pressure should be kept within the range of 0.6～1.2MPa; the water supply valve is not fully opened, the water supply pipe is blocked, the pipe is damaged, and the joint leaks. Causes low water pressure and low flow.