Adjustable pressure worm press

• US 3,877,365 A
• Filed: 07/09/1973
• Issued: 04/15/1975
• Est. Priority Date: 07/09/1973
• Status: Expired due to Term

• Current Assignee: Lennart Berggren
• Original Assignee: Lennart Berggren
• Inventors: Berggren, Lennart
• Primary Examiner(s): Feldman, Peter
• Application Number:
  US05/377,210
• Time in Patent Office: 645 Days
• Field of Search: 100/117,126,145,146,147,148,149,150,37
• US Class Current: 100/117
• CPC Class Codes: B30B 9/121 Screw constructions
• CPC Class Codes: B30B 9/124 using a rotatable and axially movable screw
• CPC Class Codes: B30B 9/18 with means for adjusting the outlet for the solid
• CPC Class Codes: D21C 9/18 De-watering de-watering in general F26B; Elimination of cooking or pulp-treating liquors from the pulpD21C9/002, D21C9/02 take precedence; paper-making machines D21F; strainers in digesters D21C7/00; presses in general B30B

Abstract

A worm press suitable for squeezing liquid out of wood pulp has an axially movable worm operating in a strainer cylinder with a flaring outlet end for the solids. The worm shaft carries a freely rotatable frusto-conical end piece. The worm shaft is actually displaced by hydraulic pressure to vary the crosssectional area of the outlet. A small reciprocating axial movement helps to prevent jamming of the press.

Claims

1. A worm press for the removal of liquid from a mixture of a solid and liquid, the press comprising a cylindrical strainer surrounding a rotatable worm, means for supplying the mixture to be pressed at the one end of the strainer and means for discharging the pressed solid at the other end of the strainer through an annular outlet opening surrounded by a wall which diverges in the direction of movement of the solid along the worm, wherein the worm has a core having portions of successively increasing diameter along a major part of its length so that the space between the core and the strainer decreases in the direction of movement of the solid along the worm, the worm is axially movable relative to the diverging outlet wall by hydraulic means during operation of the press and the inner periphery of the outlet opening is defined by a frusto-conical body which is freely rotatable relative to, but is axially movable with, the worm, said frusto-conical body having a smooth peripheral surface diverging from its axis at an angle not exceeding the angle of divergence of said outlet wall, which surface of said body is substantially flush with said worm core so as to substantially form an extension of said worm core.

2. A press as claimed in claim 1, in which the hydraulic means is arranged to cause the worm, in operation of the press, to carry out a continuous reciprocating movement.