| 1 | This paper designed a new type of muffler for pneumatic rock drill with the theory of impedance. | |
| 2 | At last, the performance evaluation of hydraulic drill machine is applied to validate the correctness of the proposed algorithm. | |
| 3 | However, burns these fuels to produce the gas, is provides the power for the compressed-air driven rock drill one good method. | |
| 4 | Application:it is fitting for serving as drill heads of heavy rock-digging. machines. | |
| 5 | The operating principle of hydraulic impact mechanism with double-chamber oil scavenger is introduced with the formula of its piston's moving velocity given. |
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