Presses – With drain means for expressed liquid – Drainage through or along pressure surface
Patent
1988-07-25
1990-02-20
Coe, Philip R.
Presses
With drain means for expressed liquid
Drainage through or along pressure surface
100150, B30B 912
Patent
active
049016369
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention is directed to a spindle press. More particularly it relates to a spindle press for pressing fluid out of a material, such as sugar beet pulp, which has a housing including a spray casing and a screen casing defining a first annular space therebetween for guiding out fluid, a press spindle rotatable in said housing and having an interior space for guiding out fluid and perforations for fluid, wherein a second annular space is formed between the housing and the spindle for feeding the material to be pressed into and for discharging the pressed material from it.
In a known spindle press of this type (DE-OS 23 64 292) constructed as a pulp press, the housing is constructed in three parts from an upper part, a central part and a lower part. A drive housing is placed on the upper part. The press spindle is supported at the bottom in a central pivot bearing and at the top in a combined radial and axial bearing of the drive housing having a large diameter. The wet pulp is introduced into the upper part radially at the circumference by means of upwardly extending filling shafts, the upper part comprising interruptors; at this upper part, a circular cylindrical upper continuation of the spindle body carries worm wings for precompressing the wet pulp. At the top, the upper part comprises a front wall which extends in a horizontal plane and is sealed with a gland relative to the upper continuation of the press spindle. The overall height and the expenditure in terms of construction of this pulp press are relatively high. The drive housing, including the drives, and the upper part load the central and lower part of the housing. The relatively large axial length of the upper part and the interruptors and worm wings of the upper continuation of the spindle body acting in the upper part do not provide a sufficient precompression of the wet pulp, in spite of the expenditure involved.
SUMMARY OF THE INVENTION
The invention has the object of increasing the precompression of the material to be pressed in the head of the spindle press with little construction related expenditure.
In keeping with these objects and with others which will become apparant hereinafter, one feature of the present invention resides, briefly stated, in that a front wall which extends transversely to the longitudinal axis of the spindle press is constructed so as to be helical in an opposite manner relative to the configuration of the worm wings, and so that the commencement of the worm wings lies behind an outlet side and of the front wall.
The longitudinal axis of the spindle press can extend vertically (upright) or horizontally (lying) or can occupy any intermediate position. In a circular cylindrical housing, the cross-sectional surface area of the spindle body preferably increases from the feed side to the outlet side. The pitch of the worm wings on the spindle body likewise preferably decreases from the feed side to the outlet side. As a rule, interruptors are fastened at the housing between adjacent worm wings so as to be distributed in a transverse plane and extend until the vicinity of the spindle body. The front wall can be welded, e.g. with the screen wall on the outside. A considerable precompression of the material to be pressed results because of the screwlike construction of the front wall as soon as the material has filled the entire second annular space between the screen casing and the spindle body after the spindle press is started. After this considerable precompression, it is easier to achieve the desired amount of dry substance of the pressed material in the remainder of the second annular space until the outlet annular gap.
In accordance with another feature of the present invention, a screw part of the front wall extends from an axial end of each filling opening on the feed side to an axial end of the same on the outlet side in direction of rotation or an axial of filling opening on the outlet side which filling opening is adjacent in direction of rotation of the press spindle. A commencement of ea
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patent: 3426677 (1969-02-01), Combs
patent: 3478679 (1969-11-01), Bauserman
patent: 3998148 (1976-12-01), Mainka et al.
Luhrs Hermann
Tegtmeyer Kurt
Werner Wolfgang
Coe Philip R.
Gerrity Stephen F.
Salzgitter Maschinenbau GmbH
Striker Michael J.
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