Disc Drill Rig

A:

A: ① After the drill rig components are transported separately to the work site, assemble them in the following order: base skid, air cylinder, disc, and feeder. During assembly, clean all connecting surfaces thoroughly, apply grease (butter), and fasten securely.

Before connecting the main air supply pipe and water pipe to the control console, blow out any sand or mud inside the pipes. Similarly, all hoses must be cleaned by blowing them out before connecting to the corresponding components of the drill rig to prevent sand or debris from entering the machinery and affecting the operation of the rock drill.

② Pre-use Preparations:​​

a. Ensure the availability of basic tools, protractors, lighting equipment, and lubricating oil. Prepare an adequate supply of qualified drill rods.
b. Inspect the roof and surrounding environment for safety hazards.
c. Check all bolts and pipe connections on vibrating components for looseness, and examine hoses for damage or aging.

③ Lubrication Requirements for Rock Drills​

Lubrication is an essential condition for ensuring the normal operation of rock drills. ​Never operate the drill without oil.Before work, the oil mist lubricator must be filled with clean lubricating oil. Adjust the oil consumption to 6–8 drops per second​(equivalent to approximately 1 kg per hour), which can support continuous drilling for ​4–5 hours. If the oil level is insufficient or excessive, adjust the regulator valve on the transparent oil sight glass.Select the appropriate lubricating oil according to the on-site temperature as shown in the table below.

④ The gas-water system of the drill rig is designed for simplicity. During installation, simply connect the corresponding hoses as shown in the attached diagram to complete assembly. The hose specifications are as follows:​

⑤ Positioning and Row Shifting

According to the blasthole design requirements, the drill rig must align with the tunnel centerline and the blasthole row line. The disc plane should be parallel to the row line; otherwise, blasting effectiveness will be compromised. Before shifting the drill rig to another row, pry the base skid out of the rock debris-covered surface. If the floor has excessive mud, place wooden planks under the pry head. Use a pry bar or a winch to move the drill rig to the next row line.

Before starting drilling, use a protractor against the feeder guide rail to verify the angle, ensuring it meets the blasthole angle design specifications.

Adjusting the pitch angle involves changing the length of the tension rod between the air cylinder and the base skid (see Figure 9). For adjusting the fan angle, loosen the two clamping plates connecting the feeder to the disc and manually rotate it to the desired angle.

⑥ Starting the Hole and Handling Drill Rods:

When starting the hole, close the rod gripper to prevent the drill rod from wobbling. Slightly open the impact, rotation, and feed valves to allow minimal compressed air for light hammering and slow rotation. Once the hole cavity is formed, fully open the air supply and simultaneously flush the hole with water. After drilling to a certain depth, release the rod gripper to avoid unnecessary wear.

The accuracy of hole initiation is crucial not only for blasthole quality but also for the normal operation of drilling. If the initial hole is misaligned, causing the drill rod's direction to deviate from the rig's movement along the track, jamming is highly likely to occur.

The process of handling drill rods is as follows:

After completing one drill rod, when the coupling sleeve enters the rod gripper, stop feeding, close the rock drill's water valve and the rotation motor's air valve. Loosen the threaded connection by hammering, then immediately close the impact air valve (minimize empty strikes as much as possible).

Close the rod gripper to clamp the coupling sleeve. Reverse the rotation motor of the rock drill at a low speed (avoid high-speed rotation), while simultaneously activating the feed air motor to retract the rock drill. The drill shank will gradually disengage from the coupling sleeve. Once disengaged, shut off the rock drill and fully open the feed air motor to quickly retract it to near the base position (avoid jamming the slide against the guide rail).

Before connecting the drill rod, first check if the water hole is clear and apply diluted wire rope grease or used oil to the threads at both ends to facilitate disassembly. Hand-tighten one end of the drill rod into the coupling sleeve by 5-7 turns, then align the other end with the drill shank. Start the rock drill's rotation motor at low speed in the forward direction and activate the feed air motor to advance the drill. Once the rod is securely connected (ensure the drill rod and shank are fully seated in the coupling sleeve to prevent tool detachment), open the rod gripper, supply full air and water, and resume operation.

After reaching the required hole depth, follow step (a) to loosen all threaded connections by hammering.

Clamp the coupling sleeve between the drill shank and drill rod. Fully loosen all threads, then press the drill shank against the coupling sleeve.

Open the rod gripper and retract the rock drill. After withdrawing one drill rod, use the gripper to clamp the coupling sleeve of the second rod, then manually unscrew it. Repeat this process until the last drill rod is removed.