| 摘要 |
An "extrusion" type baler controls bale density by regulating the size of the discharge orifice of the bale case, and the "squeeze" cylinders which provide power for changing the size of the orifice are hydraulically connected to a special pump associated with the plunger of the machine so that pressurized oil is added to or taken away from the cylinders depending upon the resistive force encountered by the plunger and its pump during the compaction stroke. The loader which stuffs a new charge of material up into the baling chamber ahead of the retracted plunger may, under certain circumstances, fail to load a new charge of material. The plunger, however, continues to reciprocate at all times and would thus add an additional slug of oil to the cylinders following deactivation of the loader but for the presence of a special control valve in the circuit which precludes flow of oil from the pump to other components of the circuit unless the loader has been operated through a loading stroke immediately prior to the next compaction stroke of the plunger. When a predetermined pressure level is achieved in the circuit, a relief path will open so as to depressurize the cylinders by an incremental amount.
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