Zuanshan Mining Machinery Co., Ltd
ZUANSHAN,Outstanding because of being professional ……
Each bit is made from quality alloy steel, and has been precision machined to produce a perfect body, heat treated to the required hardness, given surface compression for fatigue resistance, and fitted with precision buttons.
Five basic designs are available: Convex, Flat front, SpeedBit, Concave, and RocketBit. These are designed for specific applications for all rock types, hardness and conditions.
The optimum range of hole size for blast hole drilling with DTH is 90 mm to 254 mm (3 ½”–10″). Smaller blast holes are generally drilled using tophammer, and larger holes generally use rotary machines.
Key features of a high quality DTH pipe are durability, accuracy and manageability. DTH pipes are made from cold drawn piping, providing a superior surface finish and tolerance compared to conventional pipes made from hot rolled piping. This drastically reduces the risk of scaling from the pipes entering the hammer, a major cause of premature hammer failure.
The joints are friction welded to achieve maximum strength, and the threads of the end-pieces are heat treated for optimum durability and strength of the thread profile. This not only ensures long thread life, but also makes coupling and coupling quick and simple, reducing drilling time.
Pipe diameter should be close to the hammer diameter to provide optimum flushing, reducing the chances of getting stuck. In most applications, the standard API threads will be the best choice. We also offers a wide range of subs and crossover subs to meet an array of demands, all manufactured to the same standards as the pipes.