In top-hammer drilling system, the rock drills converting electric, hydraulic or pneumatic energy into mechanical energy by means of a piston and a rotary mechanism. The piston hits the shank adapter and creates a shock wave, which is transmitted through the drill rods to the bit. A series of connected drill rods is termed a drill string. Besides thrust and percussive forces, rotary force is also transmitted down the drill hole by drill rods from the drill to the bit. The energy is discharged against the bottom of the hole to achieve penetration and the surface of the rock is crushed into drill cuttings. These cuttings are in turn transported up the hole by means of flushing air that is supplied through the flushing hole in the drill string, which also cools the bit at same time. The feed force keeps the drill constantly in contact with the rock surface in order to utilize the impact power to the maximum.
In good drilling conditions use of these drills, is an obvious choice due to low energy consumption and investments on drill-strings. In the case of relatively short holes (up to 5 m), only one steel is used at any one time. For the drilling of longer holes (e.g. up to 10 m for production blasting), additional rods are attached, generally by means of screw threads at the ends of the rods, as the hole is deepened. The length of rod depends on the travel of the feed mechanism. Top hammer rigs are used in underground mines, while in quarries and in surface mines using small diameter holes (such as gold mines when bench heights are kept relatively low to improve grade control). Top hammer drills perform best with small diameter holes and relatively short depths, as their penetration rate decreases with depth and drill deviation increases with depth.
Top-Hammer Drilling Tools consist of shank adapter, drill rods, drill bits and coupling sleeves. Plato supplies complete range of tools and accessories for top-hammer drilling chain. Our Top-hammer Drilling tools are designed and in widely application for mining, tunneling, construction and quarrying work to meet all clients’ drilling needs. When select the Platos’ tools, you could request the integrated into your drilling operation, or choose the individual component to complete your current rock drilling system.
We only use carefully selected materials to produce tools, but our experience show us that design and manufacturing technique are also very important, for this reason CNC has been widely used in each of our important production procedure, and all of our workmen are well trained and skilled, to ensure reliable and cost effective tools for clients.
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