Working principle and structural features of SYZX75 wire-line coring hydro-hammer are presented.

The paper introduces technical specifications and structural concepts of newly developed "three-in-one" drilling tool(wire-line coring,hydro-hammer and PDM)and describes experiment of testing drilling hole and main borehole of CCSD.

The evaluation result shows that hydro-hammer dril.

YZX127 hydro hammer used for full face drilling is described with its structural characteristics, performance parameters and laboratory test results as well as the application prospects introduced.

Development Courses of YZX127 hydro hammer is systematically introduced.

cone bit/disc cutter drilling method, percussive drilling method (no circulation and reverse circulation) and air/fluid powered DTH drilling method, is described with concrete proposals initiated for increasing the technical level of large diameter rock socket drilling.

Visual Software System Development on Pneumatic DTH Design;

The Modal Analysis of Pneumatic DTH Short Drillstring;

Laboratory experiment and studying on bidirectional pneumatic DTH hammer

In order to illustrate the application future of virtual prototyping technology in geological engineering machinery,a pneumatic DTH hammer was selected as an example to be simulated and evaluated with the sof.

Differential-volume DTH was presented in the paper,which was totally different to traditional pneumatic DTH hammer with two-side inlet-exhausted structure,the energy efficiency and work efficiency are anticipated 20% higher than DTH hammer.