Mechanical Knowledge Base: "Hydraulic Drilling Machine"

The essence of submarine rock drilling is to make the impactor submerge into the hole during rock drilling to reduce the energy loss caused by the impact energy transferred by the drill rod, thereby reducing the influence of hole depth on rock drilling efficiency. The drilling equipment for the subsurface drilling rock drilling is the submerged drilling machine. The commonly used underground mines in China are YQ-80, YQ-100, and QZ-165. The drilled hole diameter in the rock with a solidity coefficient of f=8 to 14 is Deep holes of 80 to 165 mm can achieve higher rock drilling speeds.

YQ-100 submerged drilling rig consists of slewing mechanism, lifting mechanism, pushing mechanism, supporting mechanism and impact mechanism.

Pillar-type submersible drilling rig for roadway

The downhole drilling rig is an impact rotary drilling rig. The internal structure of the drilling rig is different from that of a general rock drilling rig. The gas distribution and piston reciprocating mechanism are independent, namely the impactor, as shown in Fig. 2. The front end directly connects the drill bit and the rear end connects the drill pipe. When the rock is impacted, the piston (hammer body) in the impactor reciprocates against the brazing tail through the gas distribution device (valve) so that the drill bit impacts the rock at the bottom of the hole. The high-speed rotation of the impactor in the hole is achieved by a separate slewing mechanism, namely a motor or pneumatic rotating device outside the hole, and a drill pipe connected to the rear end of the impactor. The rock powder produced during rock drilling is flushed out of the exhaust hole by the feng shui gas mixture. The mixed gas is injected into the impactor through the center of the drill pipe by the powder discharge mechanism, and then enters the bottom of the hole through the gas groove on the impactor cylinder block. Drilling machinery is divided into rock drills and drilling rigs. The drilling rigs are divided into surface drilling rigs and downhole drilling rigs.

1 Rock Drilling Machine: It is used to drill holes with a diameter of 20 to 100 mm and a depth of less than 20 meters in rocks above medium hard. According to its power can be divided into wind, internal combustion, hydraulic and electric rock drills, of which the pneumatic rock drill is the most widely used.

2 Surface drilling rigs: According to the working mechanism of broken ore rock, it can be divided into steel rope impact rigs, downhole drilling rigs, roller rigs and rotary drilling rigs. Because of its low efficiency, steel rope impact rigs have gradually been replaced by other rigs. DTH drilling rigs use a drill pipe to drive a pneumatic impactor to rotate together with a drill bit. The piston impact drill bit of a pneumatic impactor is used to crush ore rock, which is usually used to drill holes with a diameter of 80 to 250 mm in small and medium-sized mines. The roller rig uses a roller bit of a roller bit to crush the ore and is suitable for drilling holes of 150-440 mm in diameter in hard rock. It has the advantages of high efficiency and low labor intensity, and is obtained in large and medium-sized open metal mines. widely used. DTH (or cone) drilling rigs consist of impactor (or drill bit), slewing gear, lifting mechanism, pressurizing device, traveling mechanism, slagging system, drill frame and drill pipe. Rotary rigs are only suitable for drilling softer rock and coal.

3 Downhole rigs: When drilling downhole blastholes with an aperture of less than 150 mm, small-diameter submersible drills of 80 to 150 mm can be used in addition to rock drills. When drill holes with a diameter of less than 70 mm are drilled in coal or soft rock, electric drills or pneumatic drills are generally used to drive the drill rods with a motor (or air motor), and the drilled rock (coal) passes through the drill pipe. The spiral groove discharges.