Bale density control system

Details Bale density control system Bale density control system

1978-02-28

1979-09-25

Wilhite, Billy J.

Presses

Automatic or material triggered control

B30B 1526

Patent

active

041686594

ABSTRACT:
Hydraulic "squeeze cylinders" control the size of the discharge orifice on an extrusion baler and are operated by a control circuit that relieves pressure in the cylinders in response to the buildup of a certain predetermined pressure level in the circuit. Pressurized fluid for the squeeze cylinders is supplied by a single-acting pump cylinder that is connected between the reciprocal plunger head and its push rod in such a way as to deliver a slug of pressurized fluid into the circuit on each compression stroke of the plunger, the pump drawing in a fresh slug from a reservoir during each retraction stroke of the plunger. A pilot-operated relief valve is operated by circuit fluid when the latter reaches the predetermined pressure level to open a relief path for fluid in the squeeze cylinders, and specially calibrated ports in the circuit between the pump and the cylinders cause the relief valve-operating portion of the circuit on the pump side of the calibrated ports to exist at a higher pressure level than the remaining portion on the squeeze cylinder side.

REFERENCES:
patent: 2576784 (1951-11-01), Dodds
patent: 2582672 (1952-01-01), Bobst
patent: 2708872 (1955-05-01), Lauck
patent: 2718189 (1955-09-01), Bornzin
patent: 2763201 (1956-09-01), Hauswirth
patent: 2796825 (1957-06-01), Kreigbaum
patent: 2890646 (1959-06-01), Soteropulos
patent: 2982201 (1961-05-01), Kruger
patent: 3015262 (1962-01-01), Baines
patent: 3121387 (1964-02-01), Fuhrwerk
patent: 3866529 (1975-02-01), Holman

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