| 摘要 |
<p>The articulated boom-dipper-bucket assembly is utilized in a tunnel boring machine of the type which includes a hollow cylindrical body (12) with a front circular cutting edge (14) and a central axis on which an excavator (30) including the assembly is positioned. The assembly includes a base (46) having a front face (48) facing axially of the machine and being mounted on a bulkhead (40) having siderails which are received in channels fixed to the body and extending parallel to the central axis. Apiston and cylinder mechanism is associated with the bulkhead (40) for reciprocating same in a direction parallel to the central axis. The assembly further includes a boom (52) having one end pivotally mounted to the front face (48) of the base (46) at one side thereof and a second end positioned outwardly from the base, an elongate dipper member (58) pivotally mounted at a first inner end (60) to the second outer end (62) of the boom, and a bucket-scoop (13) having an inner edge and an outer cutting edge (64) and being pivotally mounted to a second outer end of the dipper member (58). The assembly also includes a mechanism for rotating the base on the bulkhead, a first reciprocal power mechanism (66) pivotally connected at one end to the front face (48) of the base (46)atthe other side thereof and pivotally connected at the other end to the boom (52) at a point spaced from the first end thereof, a second reciprocal power mechan- i ism (72) pivotally connected at one end to the first end of the boom (52) and at the other end to the first end of the dipper member (58) and a third reciprocal power mechanism (80) pivotally connected at one end to the first end of the dipper member (58) and at the other end to the inner edge of the bucket-scoop.</p> |
