Repair Procedure for Outriggers Failing to Descend on Pneumatic Anchor Drilling Rig

1. Inspect and Clean the Exhaust System

Check if the cylinder exhaust ports on the three-way valve body and the fixing sleeve are blocked by coal dust or oil. Use a thin wire to clear any blockages.

Remove the exhaust valve for cleaning to ensure smooth gas discharge and prevent back pressure from preventing the outrigger from retracting.

2. Disassemble, Inspect, and Replace Seals

Check if the outrigger seals are turned outwards, worn, or aged. Replace any damaged seals immediately.

Also, check the nine O-rings and gaskets on the three-way shaft. Replace any damaged or leaking seals.

3. Manual Assistance and Lubrication Maintenance

Try gently pushing the outrigger with a screwdriver to help it retract. After retraction, manually pull it to test for smooth operation.

If jamming occurs, disassemble and clean the inner wall, and apply a suitable amount of antifreeze lubricant to maintain the smoothness of the outrigger's inner wall (e.g., a standard of 0.8). 4. Check Air Supply and Pressure

Ensure the air supply pressure is within the range of 0.4–0.65 MPa. Use a pressure gauge to check the actual working air pressure.

Check the air hoses for bends, joints for leaks, and filters for blockages. Replace hoses or clean filters if necessary.

5. Standard Operation and Functional Testing

After drilling, reduce the rotation speed and allow the outriggers to fall naturally under gravity.

Repeatedly operate the directional valve to ensure the control handle is not stuck and to promote complete exhaust of air from the cylinder.