Classifying – separating – and assorting solids – Sifting – Drum sifters
Patent
1989-04-07
1990-09-18
Hajec, Donald T.
Classifying, separating, and assorting solids
Sifting
Drum sifters
209243, 209254, 209411, B07B 122
Patent
active
049576186
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to vertical screening devices, and more particularly to a vertical screening device having at least one cylinder screen and adapted to be connected with its lower end portion to a similar screening device or a drive unit and, with its upper end portion, to a similar screening device or a distributor device, said screening device further being adapted, together with the other devices connected thereto, to be imparted a movement of rotation. The screening device may thus be of the type disclosed in Swedish Patent No. 434,349, although it must not necessarily be imparted an oscillating angular velocity. The screening device is so designed that it can be removed laterally once the connections with the other devices have been undone.
SUMMARY OF THE INVENTION
The novel features of the invention reside in that the screening device comprises a bearing device for a feed screw cooperating with the cylinder screen, said bearing device being disposed within the cylinder screen and fixedly connected thereto, and said feed screw being connected through a link extending outside the periphery of the cylinder screen, to a fixed point provided outside the screening device for holding the feed screw still. The advantage of a stationary feed screw is that the screening material to be fed is imparted a predetermined feed rate, and that the material moves helically downwards in the cylinder screen. This means improved distribution and mixing of the screening material. Thus, the present invention has made it possible to use a stationary feed screw in the screening device contemplated.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in more detail hereinbelow with reference to the accompanying drawings showing, by way of example only, one embodiment of the screening device.
FIG. 1 shows the screening device in vertical cross-section.
FIG. 2 shows the bearing device in vertical cross-section.
FIG. 3 shows the bearing device from above.
FIG. 4 is a section taken along the line A--A in FIG. 2, and
FIG. 5 is a top plan view showing the link with the parts associated therewith.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The screening device 1 comprises a bearing device 3, disposed within a cylinder screen 2 and fixedly connected thereto. The bearing device supports a feed screw 4 which cooperates with the cylinder screen 2 and which is connected through a link 5 (FIG. 5) extending outside the periphery of the cylinder screen 2, to a fixed point 6 provided outside the screening device 1 for holding the feed screw 4 stationary. More specifically, the fixed point 6 is located at a fixed outer cylinder 23 disposed outside the screening device 1.
The bearing device 3 constitutes a fixed connection, for transmitting rotational and torsional forces between upper and lower end portions 7 and 8, respectively, of the screening device 1, which suitably consist of flanges. The cylinder screen 2 is, however, fixedly connected to only end portion 7, there being a space defined between the cylinder screen 2 and the other end portion 8. This space is used for accommodating the connection between the link 5 and the feed screw 4.
The link 5 of the feed screw 4 is fixed to a flange 9 fixedly connected to the feed screw 4 and located opposite the end flange 8 and opposite a corresponding flange 10 on the cylinder screen 2. Sealing means 11 are provided between the flanges 8, 9 and 10. As seen in the drawings, the sealing means 11, here being brushes, are mounted on the flange 9 so as to engage the flanges 8 and 10.
As will be appreciated from FIGS. 1 and 5, the link 5 is fixed to the outer side of the flange 9 outwardly of the sealing means 11, whereby the link 5 will in no way interfere therewith.
The bearing device 3 comprises a cylindrical tube 12 which is lower than the screening device 1. The feed screw 4 is mounted around the tube 12 by means of a substantially equally high tubular central body 13, while the screw 14 itself extends with a fully open part above the tu
REFERENCES:
patent: 263564 (1882-08-01), Nielsen
patent: 745743 (1903-12-01), Thayer
patent: 4645590 (1987-02-01), Satake
Hajec Donald T.
Lindema Kommanditbolag
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