| 摘要 |
An excavating machine having a cutter head which is provided with both reciprocating impact hammers and a static pick. The impact hammers are mounted on either side of the static pick so as to flank this, and the tip of this can be extended or retracted relative to the tips of the hammers. The ripper pick can thus scarf out a mound of earth left between the two impact hammers, or can be extended to cut a channel into which the impact hammers then drive the adjacent material. The impact hammers can be tilted relative to the axis of the ripper pick so that their tips either precede or follow that of the pick as they are moved across the working face. The cutter assembly may be mounted to a tracked vehicle so as to extend forwardly from this for continuous mining, or laterally from this for long wall mining.
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