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2022
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What are the classification, installation and preparation of DTH drills?
What are the classification, installation and preparation of DTH drills? There are two kinds of rock drills and drilling rigs. Drilling rigs are divided into open-pit drilling rigs and underground drilling rigs. ① Rock drill: used to drill holes in rocks of medium hardness and above, with a diameter of 20-100mm and a depth of less than 20 meters. According to its power, it can be divided into pneumatic, internal combustion, hydraulic and electric rock drills, of which pneumatic rock drills are the most widely used.
DTH BITWhat are the classification, installation and preparation?
There are two kinds of rock drills and drilling rigs. Drilling rigs are divided into open-pit drilling rigs and underground drilling rigs.
① Rock drill: used to drill holes in rocks of medium hardness and above, with a diameter of 20-100mm and a depth of less than 20 meters. According to its power, it can be divided into pneumatic, internal combustion, hydraulic and electric rock drills, of which pneumatic rock drills are the most widely used.
② open-pit drilling rig: according to the working mechanism of broken rock is divided into steel wire percussion drill, down-the-hole drill, tooth wheel drill and rotary drilling rig. Due to the low efficiency, the wire rope percussion drill is gradually replaced by other drilling rigs. Down-the-hole drilling rig uses the drill pipe to drive the pneumatic impactor and the drill bit to rotate together, and uses the piston impact drill of the pneumatic impactor to crush the ore rock. Cone drills use the rolling action of a cone bit to break up ore rock. Suitable for drilling in hard ore rock with a diameter of 150-440mm. It has the advantages of high efficiency and low labor intensity. It was obtained in large and medium-sized open-pit metal mines. are widely used. DTH drill consists of impactor (or drill), rotary mechanism, lifting mechanism, pressure device, walking mechanism, slag discharge system, drill frame and drill pipe. Rotary drilling rigs are only suitable for drilling softer rock and coal.
③ Downhole drilling rig: When drilling downhole holes with a diameter of less than 150mm, in addition to rock drills, small diameter down-the-hole drills of 80-150mm can also be used. When drilling holes with a diameter of less than 70mm in coal or soft ore rock, electric drills or pneumatic drills are generally used, and the drill rod is driven by an electric motor (or pneumatic motor) to drill holes, and the drilled rock (coal) cuttings pass through the drill rod. Discharge of spiral groove. Development of foreign down-the-hole drilling rigs
In recent years, foreign down-the-hole drill manufacturers have launched a series of new products. For example, Sanvik's TITON100 down-the-hole drill, crawler down-the-hole drill, atlas copco's ROC L830 down-the-hole drill' 6. ROC L830 down-the-hole drill is equipped with a compressor, which can provide 3MPa air pressure. Equipped with a unique bucket conveyor system, can handle the diameter of 140mm large drill pipe. The common feature of these devices is that the degree of automation is getting higher and higher. Some functions realize the application of intelligent GPS technology on these drilling rigs, realize the automatic positioning of the boom, save on-site time marking and positioning, improve operation efficiency, and enable operators to concentrate on monitoring the drilling progress. At the same time, pay more attention to safety and environmental protection and the improvement of man-machine relationship. With the implementation of new engine emission regulations, mobility, intelligent control and environmental regulations Tier 3/Euro IIIA emission regulations, most foreign drilling rig manufacturers have adopted diesel engines that meet emission standards.
(1)DTH BITInstallation and preparation
1. Prepare a rock cavern. The size of the cavern can be determined according to the drilling method. Generally, the height of the cavern is 2.6-2.8 m when drilling horizontal holes, and the width of the cavern is 2.5 m and the height is 2.8-3 m when drilling upward holes, downward holes or inclined holes.
2, the gas, water pipes, lighting lines, etc. to the working face near the use.
3. Erect the pillar firmly according to the design requirements of the hole. The upper and lower ends of the column shall be padded with planks. After installing the horizontal shaft and snap ring on the column according to a certain height and direction, use a manual winch to lift the machine, fix it on the column at the required angle, and then adjust the hole of the drill. To.
(2) Pre-operation inspection of DTH bit
1. When starting work, carefully check whether the gas and water pipes are firmly connected and whether there is air leakage or water leakage.
2. Check whether the oil injector is full of oil.
3. Check whether the screws, nuts and joints of each part have been tightened and whether the column is firmly supported.
(3)DTH BITDrilling Procedure
When opening the hole, start the motor first, and then pull the push handle of the manipulator after the transfer is normal. Make it get the proper thrust and then pull.
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