Difficulties in the construction of down-the-hole hammer drilling tools used by water well drilling rigs
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The DTH hammer drill tool for water well drilling rigs consists of a cylinder liner and a piston that moves up and down in the cylinder liner. The lower end of the cylinder sleeve is connected with the drill bit, and the upper end is connected with the drill rod through a threaded joint. The 0.7-1.4MPa high-pressure air provided by the air compressor pushes the piston into the rock formation through the check valve above the piston, the air distributor and the air inlet below the piston.
Down the hole drilling rigs use high-performance geared motors as rotation power and hydraulic cylinders as propulsion power. The hydraulic system is omitted, the mechanical efficiency is high, the cost is low, and the performance is stable. When the drilling tool is stuck, the motor is not easy to burn out, and the reducer is not easy to be damaged. It is lightweight and easy to move. The weight of the down-the-hole drill (within kg) is 500KG.
Using a rolling trolley, the track is not easy to wear. The down-the-hole drilling rig adopts semi-automatic drill pipe disassembly, which has high working efficiency. Bring huge economic benefits to users. In particular, it solves the difficulty of down-the-hole hammer drilling in the soil layer, and the construction problem of the rotary drilling machine in the hard rock layer, gravel layer and pebble layer. The drilling process of the drill bit of the water well drilling rig is summarized. It is also necessary to pay attention to the tracking of the casing, to understand the specific conditions of the wellbore in time, and to keep the wellbore clean when necessary. The drill bit on the water well drilling rig is drilling. It is strictly forbidden to lift the drill bit forcibly.
In order to meet the drilling needs of different formations and improve drilling efficiency, drilling rigs are developing in the direction of multi-functional drilling rigs, full hydraulic transmission and operation: drilling rigs are equipped with various equipment and accessories, which can perform percussion drilling, rotary drilling and down-the-hole hammers.
