Presses – With drain means for expressed liquid – Drainage through or along pressure surface
Patent
1988-07-11
1990-07-17
Stinson, Frankie L.
Presses
With drain means for expressed liquid
Drainage through or along pressure surface
100127, 100131, 100145, 100150, B30B 302
Patent
active
049414046
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a screw-type spindle press. More particularly, it relates to a screw type spindle press which has a housing including a spray casing and a screen casing defining an annular space therebetween, a press spindle rotatable in said housing within said screen casing so as to form a pressing space therebetween and provided with a plurality of wing members, and at least one axial zone which is free of the wing members, and at least one hollow perforated dewatering member which is provided in the above mentioned axial zone in the pressing space between the spindle and the screen casing and having an outlet in the annular space between the screen casing and the spray casing.
In a known pulp press of this type (DE-OS 31 25 653) the dewatering members, which are similar to the interruptors, are fastened directly at the housing, so that their hollow space is partly defined by means of the screen shell. Accordingly, dewatering surfaces are lost on the screen wall on the one hand and at the dewatering members on the other hand.
In another known pulp press of this type (DE Utility Model 1 846 103) interruptors are arranged in the axial zones between adjacent worm wings, which interruptors are guided through openings in the spray shell and the screen shell from the outside and are fastened at the spray shell. A hollow spindle body of the press spindle is perforated along its entire length for conducting the press fluid out of the pulp press cake.
The worm wings and the interruptors are provided with screen surfaces and with ducts for conducting out the press fluid. Details of the construction of the interruptors are not disclosed. It is disadvantageous that the length of the interruptors and, accordingly, their open cross-sectional surface area of flow-off decreases in a transporting direction of the pulp press.
Half-moon-shaped interruptors which are swivelable around their longitudinal axis are known, per se, from DE-PS 963 230; the pointed edge of these interruptors can be directed against the pulp flow. Every interruptor has a hollow space which communicates with the first annular space or pressing room via a series of nozzles in a rear wall of the interruptor. The nozzles serve to feed heat into the pressing room, particularly by means of steam for heating the pulp press when starting. The nozzles are also supposed to be suitable for conducting away the pressed out fluid. However, this appears to be ruled out, since the nozzles lie in an expansion area of the interruptor which decreases in cross-sectional surface area and in which the adjacent pressed pulp expands, that is, they release no fluid, but, on the contrary, suck it in. SUMMARY OF THE INVENTION
The invention has the object of increasing the output.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated in a screw press of the above mentioned general type in which the dewatering member or every one of the dewatering members is arranged at a radial distance from the spindle and the screen casing and is held by at least one carrier. The longitudinal axis of the screw press can be arranged so as to be vertical (upright) or horizontal (so as to lie) or can occupy any intermediate inclined position. With a circular cylindrical housing, the cross-sectional surface area of the spindle body preferably increases from the inlet side to the outlet side. Likewise, the pitch of the worm wings on the spindle body preferably decreases from the inlet side to the outlet side and the spindle body is hollow and perforated. As a rule, interruptors are fastened at the housing between adjacent worm wings so as to be distributed in a transverse plane and extend into the pressing room until the vicinity of the spindle body to the extent that this is allowed by the dewatering members. The radial distance of every dewatering member from the spindle body can be equal to its radial distance from the screen shell. The dewatering members prefera
REFERENCES:
patent: 3998148 (1976-12-01), Mainka et al.
patent: 4530761 (1985-07-01), Koch et al.
Salzgitter Maschinenbau GmbH
Stinson Frankie L.
Striker Michael J.
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