1. The miners used rock drills and compressed air to drive through hard rock.

2. The rock drill is indispensable for digging coal mines.

3. This paper analysed the noise characteristic of pneumatic rock drill stell. Introducing the harness method of pneumatic rock drill stell noise.

4. Mini rock drill has been produced based on patented technology for rock drill warm extrusion.

5. Since the process of colliding mechanism of electric rock drill is complex, there isn′t a set of calculating method practically still now.

6. In this article, Rock Drill, Drill Steel, Bit and Rock have been carefully studied as a whole system.

7. The paper, first puts forward a rock drill should not be studied as a single object.

8. Round a elastic rod, this paper establishes a rock drill model which composed of four basic components .

9. According to movement of piston in hydraulic rock drill, the deferential equation on piston was set up and its kinematic parameters' formula was deduced.

10. Disassamble the rock drill and inspect the wear, replace worn part.

11. The impact hammer of a hydraulic rock drill is a mechanism with high pressure and high frequency. Its seal performances affect the efficient(), energy consumption and steadiness of the rock drill.

12. Lubricant, Grease, Engine Oil, Hydraulic Oil, Transformer Oil, Rock Drill Oil, Marine Oil, Diesel , Petrol - Chemical Product Petrochemical Products.

13. The importance of correct lubrication of the rock drill cannot be over-emphasized. In adequate lubrication accelerates wear and can ever lead to breakdown.

14. Used in paper machine oil, rock drill oil, turbine oil, hydraulic press oil, convector oil and other industrial lubricant used in water.

15. What we have done in this paper is of great significance in designing the heavy rock drill to drill deep and large diameter hole.

16. This paper designed a new type of muffler for pneumatic rock drill with the theory of impedance.

17. The energy loss of the impact mechanism of hydraulic rock drill greatly affects drilling efficiency when it operates.

18. Leading energy loss of the flow valve in hydraulic rock drill was analyzed and its formula was presented.

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19. This design draft , mainly about the technological process of YTP26 Air-leg Rock Drill, and elabora about the milling machine typical jig design.

20. Finally, based on the theories and methods presented, a new independently-rotated valveless pneumatic rock drill was designed.

21. On the basis of theoretical linear model, the paper studies the influence of input flow on operating parameters of shock mechanism for hydraulic rock drill, and a series of brief formulae are derived.

22. According to the drive mechanism and the demand of the hydraulic rock drill, the structure character and the designing ways of the impact device, control valve and supporting arm were introduced.

23. Therefore this system is a effective means for developing a hydraulic rock drill.