Classifying – separating – and assorting solids – Sifting – Distributers or spreaders
Patent
1987-02-05
1989-04-04
Peters, Jr., Joseph F.
Classifying, separating, and assorting solids
Sifting
Distributers or spreaders
209247, B07B 140
Patent
active
048183792
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a screening apparatus and is particularly suitable to and intended for screening machines of the multi-deck type.
The manner in which granular materials are being fed to a screen is of vital influence when it comes to achieving optimum capacity and efficiency.
Normally, screens are fed by means of feeding equipment such as conveyors, screws, vibrating feeders, etc. In such cases a more or less even distribution of the material to be screened is achieved prior to the screening apparatus. Often the material will be fed straight on to the screen cloth or the screening apparatus is equipped with a so-called feeder plate onto which the material is brought in order to protect the screen cloths from wear. The material then falls from this feeder plate onto the screen cloth.
This way of feeding has the consequence that the active screening area is not optimally utilized, because certain areas near the inlet are not engaged or the distribution of the material across the width is uneven. Frequently, the bed of material is thicker in the middle than near the sides so that the centre would be overloaded while the outer parts of the screen cloths could take more load.
Further, the material to be screened, which consists of a mixture of fine and coarse particles, must be segregated in the screening process so that the fine particles can be separated from the coarser ones. This happens relatively slowly and the relative capacities per screening surface area are correspondingly small. As a consequence, screens have to be unnecessarily large.
The invention aims at avoiding the disadvantages above and solves the problem of obtaining screening apparatuses where the material, upon arrival at the screen cloths, is evenly distributed and also already to a certain extent segregated, so that the screen cloths can be optimally used for their purpose and the screening apparatuses can be made much smaller, thereby reducing the screening costs considerably.
SUMMARY OF THE INVENTION
To provide this function according to the invention the inlet space of the screening apparatus has one or more distributing and segregating devices which are integrated in the movement of the screening apparatus.
It has also proven advantageous that the distributing and segregating devices are components that are exchangeably attached to the frame of the screening apparatus. The frame then permits different distributing and segregating devices to be attached at the inlet space, to suit the properties of the material and the production. The material can also arrive at the screen from almost any direction and at almost any speed which also requires a selection of distributing and segregating devices. it is then of course important that the same type of attachment to the frame of the screen fits all the different types so that they can be exchanged in a modular fashion.
An example of a distributing and segregating device could be an enclosed box with openings for inlet and outlet to the screen cloths, where the bottom at the inlet space has a roof-like shape and slopes from the centre out towards the sides and where the subsequent part of the bottom has a more shallow flat surface.
Depending upon the type of material to be screened and its properties it can be necessary to include further deflecting or guiding elements. This could be made in the form of a vertically adjustable, distributing profile at a distance above the bottom, before the outlet opening. This distributor could be serrated, castellated, etc. at its lower edge.
For other materials it could be necessary to have deflecting or guiding components attached to the bottom and possibly made adjustable. By means of such parts an even better distribution of the material across the entire width can be arranged. Another example of distributing and segregating device could be a box with one or more inlets, an outlet to the screen cloths and two distributing flaps which slope from the centre towards the sides in a roof-like fashion and which can be set
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patent: 4568461 (1986-02-01), Aoustin
patent: 4576713 (1986-03-01), Melin
Bartz Clifford T.
Fredrik Mogensen AB
Peters Jr. Joseph F.
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