| 摘要 |
A method and apparatus for compressing fibrous material into dense bales having uniform size, shape and weight. Weighed longitudinally extended charges of material having a predetermined transverse dimensional profile are individually loaded into a compression chamber defined by side plates and first and second movable end platens. A long-stroke small-diameter hydraulic piston pushes the first end platen against the charge toward the second end platen, partially compressing the charge. The first end platen is then latched in a fixed position at full stroke while the second end platen, via a short-stroke large-diameter hydraulic piston, applies a further compressive force to the charge against the first end platen. The resulting fully compressed charge is pushed out of the compression chamber, bound loosely while still fully compressed, then released, whereupon the bale longitudinally expands into the bindings to a predetermined length. As the large-diameter piston retracts to begin the subsequent compression cycle, hydraulic oil is routed therefrom to other hydraulic cylinders to effect retraction thereof, thereby lessening demand on the hydraulic pump, saving energy and reducing cycle time.
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