Apparatus and method for baling lint cotton fibers
An apparatus and method for producing a bale of lint cotton fiber by pre-compressing each consecutive charge of fiber fed from the lint slide to a predetermined and uniform density. The apparatus includes a supply chamber predisposed with both vertical and horizontal platens driven by independent hydraulic cylinders. The movement and cycling of the platens is such that measured charges of fibers are presented to a vertical tramping device at consistent and uniform density. The tramping device, consisting of a platen driven by two hydraulic cylinders, packs each charge into a stationary box, one charge after another. This process continues until the desired bale weight is reached. The tramper cylinders are driven to a predetermined pressure setting during the tramping phase of each stroke cycle (extension) resulting in uniform compression (density). To maintain uniform density throughout the tramping phase of bale formation, the tramper stroke is varied by means of a closed loop control system and infinite position sensing.
1. A method for controlling an apparatus for baling fibrous materials to control the weight of bales produced by said apparatus, comprising the steps of:
a) controlling a feed rate of unbaled fibrous material into a pre-compression supply station to form discrete charges of material having substantially uniform weight and density,
b) iteratively urging said pre-compressed charges of material into a tramping mechanism,
c) compressing each of said charges of material within a baler box of known dimensions by applying a force with said tramping mechanism to a uniform density by linearly moving a tramping foot to a variable position into and within said baler box,
d) sensing positions of said tramping foot during operation of the apparatus and sensing the force required to urge said tramping foot to a variable position within said baler box for each of said charges of material based on a predetermined level of force,
e) dynamically determining a moisture content of said fibrous material based on an assumed density and force relationship, and the force and position sensed; and,
f) varying the rate of feed of said fibrous material in accordance with said dynamically determined moisture content relative to a predetermined moisture content.
2. The method as defined in claim 1 further comprising varying the movement of said tramping foot to achieve substantially universal density in a bale formed from a plurality of charges of material within said baler box.
3. The method as described in claim 1 further comprising varying the rate of feed of said fibrous material based on said dynamically determined moisture content to achieve substantially the same weight in successive bales of fibrous material formed from said charges.
4. The method as defined in claim 1 further comprising,
a. moving said baler box containing a desired quantity of fibrous material to a baling station concomitantly with moving a second baler box into position to receive charges of fibrous material;
b. compressing the fibrous material in said baler box to a final bale compression in said baling station while tramping subsequent charges of fibrous material into said second baler box; and,
c. dynamically monitoring the pressure utilized by said tramping mechanism and said baling station and allocating horsepower to meet the needs of each.
5. The method as described in claim 1 wherein said iteratively urging step comprises:
a. compressing a charge of fibrous material into a pre-compression chamber along a first axis,
b. maintaining said compression on said charge of fibrous material while urging said fibrous material along an orthogonal axis from said pre-compression chamber into said tramping mechanism.
6. The method as defined in claim 5 further comprising intentionally shearing any excess fibrous material extending beyond said pre-compression chamber.
7. The method as described in claim 5 further comprising varying the rate of feed of said fibrous material forming selective charges of fibrous material in accordance with said dynamically determined moisture content to achieve substantially the same weight in successive bales of fibrous material formed from said charges.