US3002446A - Screw press - Google Patents

Description

E. V. JUNG SCREW PRESS Oct. 3, 1961 2 Sheets-Sheet 1 Filed May 26, 1959 IN VENTOR Z/"Zdfld 211247;;

BY J me/2 A RNEY5 Oct. 3, 1961 v, JUNG 3,002,446

SCREW PRESS Filed May 26, 1959 2 Sheets-Sheet 2 INVENTOR BY W *M AT ORNFY5 United States Patent 3,002,446 SCREW PRESS Erland Viktor Jung, Landskrona, Sweden, assignor to Aktiebolaget Landsverk, Landskrona, Sweden Filed May 26, 1959, Ser. No. 815,921 Claims priority, application Germany Jan. 7, 1959 6 Claims. (Cl. 100-145) This invention relates to a vertical screw press and particularly to the type thereof comprising a spindle with outwardly extending screw blades, a surrounding stationary drainage jacket and an upper central hopper for the material to be pressed, such as beet pulp and other kinds of pulp.

In known presses of this kind the motor and the gear for driving the spindle are usually provided above the hopper, through which the shaft extends. This arrangement reduces the space within the hopper, and the material must be fed to the hopper from the side by means of a separate feeding screw. As the volume of this material is c onsiderably larger than the pressed and discharged material, it is difiicult to feed and equally distribute the required material around the shaft of the spindle. The uneven distribution involves the inconvenience that the shaft of the spindle will be exerted to an eccentric pressure and therefore must be dimensioned with respect thereto. As the shaft passes through the hopper and as it is desired to have a hopper of a great height for obtaining a certain pressure for feeding the material in between the screw blades the shaft obtains a great length and must be given a corresponding diameter. As further the motor and the gear are provided at a high level the access thereto may be uncomfortable.

An object of the invention is to provide driving means for the screw at the top of the spindle in such a way that the upper shaft end is shortened.

Another object of the invention is to apply the driving means at the top of the spindle in such a manner that at least the upper portion of the hopper is free of the shaft, so that the material to be pressed may be accumulated to a suflicient height and be more evenly distributed.

A further object of the invention is to provide a driving gear allowing the material to pass through the same on its way through the press.

Other objects and advantages of the invention will become apparent upon reading the following specification and studying the accompanying drawings in which:

FIGURE 1 is a vertical sectional view of a press having the driving gear wheel provided on the upper axle neck of the spindle.

FIGURE 2 is a sectional view on an enlarged scale of a sealing device for the driving gear wheel.

FIGURE 3 is a sectional view of a screw press having a driving gear ring secured to the screw blades.

In the drawings, a spindle with a casing or body 1, which diminishes upwards along a suitable curve, such as conically or parabolically, carries pairs of screw 'blades or flights 2 which rotate at a short distance from a surrounding, cylindrical drainage jacket 3 located within a housing 4. Resistors 5 secured to the housing extend through the jacket 3 and between the different pairs of flights 2 for counteracting the tendency of the pressed material to rotate with the spindle. An upper axle neck 6 and a lower axle neck 7 may form the ends of a spindle shaft or may be made as separate parts secured to the casing 1. The upper axle neck 6 is journalled in a bearing 8 which is supported by preferably three arms 9 passing with their outer ends through the jacket 3 and being welded to a ring-shaped frame 10. The arms 9 are made thin and high in order to offer only a slight resistance to the material passing downwards between the arms and simultaneously guide the material and prevent it from 5 3,902,446 Patented Oct. 3, 1961 rotating with the spindle. The lower axle'neck 7 is journalled in a thrust bearing 11 provided in the base portion of the press.

Above the bearing 8 a hub 12 is fastened to the axle neck 6 by means of a key not shown, and by preferably three arms 13 it is connected with a gear ring 14 engaging a gear wheel 15 on the shaft of a gear reduction motor 30. Also the arms 13 are made thin and high, and for feeding the material downwards between the arms 9 of the bearing 8 they form oblique shovels or wings. The gear ring 14 has an upper flange 16 and a lower flange 17, of which the flange 16 embraces the lower edge of the wall 18 of a hopper and the flange 17 embraces an upwardly directed flange secured by a horizontal ring to the frame 10 and forming an extension of the jacket 3. Between the rotating flanges 16, 17 and the opposite, stationary surfaces sealing rings 19 are provided, and the inner surface of the gear ring forms a continuous connection between the jacket 3 and the wall 18. A plate 20 covering the hub 12 is fastened to the end surface of the axle neck 6 by means of bolts and carries a conical hood 21 for guiding the material. The ring-shaped frame 10 forms the support of a bar-shaped frame portion 22 which serves as a base for the motor 30 and also carries the hopper 18. The hopper, which has a conical and downwards Widening form, has a height considerably greater than its diameter. It has an upper, central charging opening 23 to which the material is fed by means of a separate screw 24. By this arrangement the material is very evenly distributed around the axis of the spindle to prevent eccentric stresses on the spindle. The arms 9 and 13 represent only a slight resistance to the material, and by the weight of the material in the high hopper and by the additional pressure from the wings 13 a compressed filling of the uppermost screw blades 2 will be obtained, whereby the capacity of the press will be increased.

The embodiment of the invention shown in FIGURE 3 differs from that according to FIGURES 1 and 2 especially in the mounting of the gear ring 14, which is welded directly to four screw blades 27 provided on the spindle in the first press section, but it is also possible to mount the gear ring at a lower level above the lowest portion of the screw blades. Instead of the arms 13 the hood 21 is provided with upper projecting, oblique feeding Wings 28 and similar lower wings 29, between which one or more resistors 5 are provided, which are secured to the hopper wall and counteract the tendency of the material to rotate.

I claim:

1. A vertical screw press comprising a spindle with outwardly extending screw blades, a surrounding stationary drainage jacket, a central hopper forming an upper extension of said jacket and extending above the top portion of said spindle, a bearing for an upper axle neck of the spindle provided at a level above said screw blades and supported by a plurality of outwardly extending arms connected to a ring-shaped frame around said spindle, and a driving gear ring secured to the spindle at a level below said hopper and above the lowest portion of the screw blades and forming within the gear ring a passage for the material passing downwardly from said hopper.

2. A vertical screw press comprising a spindle with outwardly extending screw blades, a surrounding stationary drainage jacket, a central hopper forming an upper extension of said jacket and extending above the top portion of said spindle, a bearing for an upper axle neck of the spindle provided at a level above said screw blades and supported by a plurality of outwardly extending arms connected to a ring-shaped frame around said spindle, and a driving gear ring located at a level below said hopper and above the lowest portion of the screw blades and secured to the upper axle neck of the spindle by means of a hub and arms connecting the gear ring with the hub and forming passages between the arms for the material passing downwardly from said hopper.

3. A screw press as claimed in claim 2, wherein the gear ring is located between the hopper and the bearing and the arms of the gear ring are formed as oblique wings for feeding the material to be pressed.

4. A vertical screw press comprising a spindle with outwardly extending screw blades, a surrounding stationary drainage jacket, a central hopper forming an upper extension of said jacket and extending above the top portion of said spindle, a bearing for an upper axle neck of the spindle provided at a level above said screw blades and supported by a plurality of outwardly extending arms located within said hopper, and a driving gear ring surrounding the screw blades and secured to said screw blades.

5. A vertical screw press comprising a spindle with outwardly extending screw blades, a surrounding stationary drainage jacket, a central hopper forming an upper extension of said jacket, a bearing for an upper axle neck of the spindle provided at a level above said screw blades and supported by outwardly extending arms, and a driving gear ring secured to the spindle and forming within the gear ring a passage for the material to be pressed, 25

said gear ring being located between the drainage jacket and the hopper and having a lower sealing ring bearing against the jacket and an upper sealing ring bearing against the hopper.

6. A vertical screw press comprising a spindle with outwardly extending screw blades, a surrounding stationary drainage jacket and extending above the top portion of said spindle, a central hopper forming an upper extension of said jacket and having a height above the upper portion of the spindle exceeding its width, a feeding device located at the top of the hopper, a bearing for an upper axle neck of the spindle provided at a level above said screw blades and supported by a plurality of outwardly extending arms, oblique feeding wings secured to the top portion of the spindle above said bearing, and a driving gear ring secured to the spindle at a level below said hopper and above the lowest portion of the screw blades and forming within the gear ring a passage for the material passing downwardly from said hopper.

References Cited in the file of this patent UNITED STATES PATENTS

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