Research Article
Design Optimization and Performance Analysis of the Pneumatic DTH Hammer with Self-Propelled Round Bit
Table 4
Technical parameters of the novel DTH hammer in comparison with other DTH hammers.
| | Type of DTH hammer | Novel hammer (Φ105 mm) | Valve hammer (Φ89 mm) | Valveless hammer (Φ89 mm) | RC hammer (Φ108 mm) | Rock drill (Φ75 mm) |
| | Impact energy (J) | 76 | 113 | 210 | 165 | >70 | | Frequency (Hz) | 28 | 16 | 19.2 | 18 | >33 | | Pressure (MPa) | 1.2 | 0.63 | 1.05 | 1.0 | — | | Air consumption (m3/min) | 3.18 | 9 | 4.5 | 5 | <3.5 |
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