DE2740500A1 - Multiple screen mineral grader - has funnel hopper beneath several screens for undersize material and discharge conduit for oversize material - Google Patents

Abstract

The screening appts. comprises a number of screens in end-to-end relation but with spaces between the ends of adjacent screens whereby oversize material falls from corresponding ends of the several screens. Means for depositing substantially uniform quantities of material to be screened at the opposite ends of the several screens, is provided. A funnel-like hopper beneath the several screens receives the undersize material which passes through the screens and converges the same to a common discharge conduit. A conduit for discharging oversize material from the several screens extends and guide means at the ends of the several screens receives oversize material falling and converge such material in a lateral direction and directs the same into a discharge conduit. The oversize material discharge conduit being substantially narrower than the width of the screens to permit the undersize material to fall past the conduit to the hopper.

Description

Sieve device

In the case of industrial sieving, it has been proposed to use the silicon joint or to increase the screening capacity by having a relatively long screen surface is used and the material is placed at some points along the screen surface. With such proposals, the oversized material will be elongated from all application points Jes sieves carried to the end of the sieving and therefore the material to be sieved becomes which is applied to the sieve at the last application point, to the oversized material applied by the previous application points. Accordingly, the efficiency is of sieving over the entire length of the sieve is not uniform and the sieving result is not uniform is not even. Furthermore, since the material which is on the sieve at different Points is applied, along the screen surface wanders through different distances, the sieving effect is not uniform with regard to the individual applications.

Brenn increased sieving capacity is required, there is a another and more obvious alternative in it, merely additional, perfect to use separate and independent screening devices of the conventional type.

The invention provides a screen structure in which the entire Sieve surface consists of several sieves, which are generally in an end-to-end relationship are located, with facilities for uniform application of the starting material on Entrance end of each sieve, and with facilities for collecting the oversized ones Material at the exit end of each sieve, as well as with a collection system for collecting and forwarding the oversized material from the individual screens to one common emptying point.

With the above arrangement, each of the individuals does Sieves its sieving function independently and becomes through the working of neighboring sieves not affected. Achieving maximum screening performance and uniform screening is achieved by combining the new screen assembly of the invention with the non-clogging screen assembly according to US patent application 660,490, and also by Applying the flow divider according to US patent application 653 364. This flow divider ensures that the starting material fed to the individual sieves with regard to Composition and quantity is very uniform.

The invention includes a vibratory screening device in which a high screening capacity is achieved by creating a series of inclined screens, which are generally arranged in end-to-end relationship, thus undersized Material that passes through the sieves in a common filling vessel, which is arranged below the sieves, is recorded. The oversized material falls from the lower end of each screen and guide devices located there direct the oversized material from the individual sieves into a common line, which extends longitudinally below the screens to remove the oversized material from the Derive device. A divider above the device divides the Input material in equal parts, which correspond to the number of sieves, and loads the upper ends of each sieve with such parts.

Figure 1 of the accompanying drawings is a general side view one Embodiment of the device according to the invention, parts of the device for additional illustration are broken away; Pig. 2 is a similar, something schematic view of the sieve part of the device of FIG. 1; Fig. 3 is a Top view of the structure of FIG. 2; Fig. 4 is a longitudinal cross-sectional view Line IV-IV of Figure 2; and Fig. 5 is a similar cross-sectional view in line V-V of Fig. 2.

The screening device shown in the accompanying drawings has a generally rectangular, inclined screen frame 10 in which three separate, mutually identical screen elements 12, 13 and 14 are clamped.

The screen frame 10 is by means of rubber mountings 17 and 18 on one Rigid support frame 16 attached, wherein the rubber mounts allow the screen frame, to vibrate to promote the screening of the material. On the screen frame 10 is the ordinary vibrating motor 20 attached, which has an unbalanced mass of one or other type for the purpose of generating vibration pulses so that the sieve frame is caused to vibrate on its rubber mounts 17 and 18 rapidly.

Screens 12, 13 and 14 are removable by conventional means mounted in the frame and preferably have the new type of twin-screen structure, as shown and described in U.S. Patent Application 660,490. The usage the arrangement according to this patent application brings a novel and very useful Result of not clogging, which allows the use of relatively shorter sieves to achieve sieving efficiency and uniformity as before was not attainable. The use of shorter screens is with the present one Multi-sieve arrangement of particular importance because this significantly increases the overall length of the multi-sieve structure reduced.

The feedstock to be screened is fed into a three-way flow splitter or divider, denoted by 22 in FIG. 1, introduced via an inlet line 23. The material introduced into the divider 22 becomes uniform into three in the divider Portions or

Components divided, which emptied through lines 24, 25 and 26 The said lines lead to outlets 27, 28 and 29. The means, through which the three material portions in components of uniform density, distribution and amount to be divided are clearly described in U.S. Patent Application 653,364.

The material from the outlets 27, 28 and 29 is on the upper ends the sieves 12, 13 and 14 applied. As shown at 30 in Figure 1, the material from the outlet 27 by means of a bead 30 across the top of the screen 12 expanded and similar flanges are at the lower ends of the outlets 28 and 29 provided.

The undersized material, which through the individual sieves 12, 13 and 14 passes through, is received in a filling vessel 35, which at its lower Has an outlet 36 at the end. The oversized material wanders through the individual sieves downwards and falls from their lower ends. The oversized material from the sieve 12 falls from the lower end of the sieve surface into a transversely extending, funnel-like one Collector 37 down, which guides the oversized material into a channel 38, wherein the channel extends below the sieves 13 and 14 and in an outlet 39 for the oversized stuff ends. The cross-section of the channel 38 is best can be seen from FIG. 5.

A funnel-like structure 40, which in the Piguren 2 and 4 denoted by 37 is similar, is provided at the lower end of the sieve 13 and empties the oversized material from screen 13 into channel 38. The oversized Material in front of the sieve 14 goes from the end of the sieve into a similar funnel-shaped structure and is then fed directly into the outlet line 39.

A subordinate portion of the undersized material that passes through passes the sieves 13 and 14, falls on the upper surface of the flume 38, but the contour of this surface and the vibration of the device do so sieved material to fall from the channel into the filling vessel 35.

The invention is not limited to those reproduced here by way of example Embodiments turned off alone. In the context of the invention, the Pachmann are rather numerous amendments were made without further ado.

- claims

Claims (6)

Claims 1.) Sieve device, characterized by a number Screens (12, 88, 14) in a generally end-to-end relationship, but with gaps between the ends of adjacent screens, eliminating oversized material of corresponding Ends of each sieve fall off; Means (22, 27, 28, 29) for applying substantially uniform amounts of material to be screened on the opposite sides Ends of each sieve; a funnel-like filling vessel (35) below each Screens for receiving the undersized material that passes through the screens and merging the screened material into a common discharge line (36); a service for emptying oversized material from each sieve, which generally long of the device extends below the screens; and guided tours at the ends of each sieve to accommodate the oversized material which falls down, for merging such material in the lateral direction and straightening of this material into the drainage line, the drainage line for the oversized material is much narrower than the width of the sieve to make it the undersized Allow material to fall past this power into the filling vessel (35). 2.) Device according to claim 1, characterized by devices (23, 30) above the sieves to receive a continuous stream to be sieved Material, for dividing the stream into equal parts according to the number of sieves, and for emptying the individual parts onto the individual sieves. 3.) Device according to claim 1, characterized in that each of the individual sieves is inclined in the longitudinal direction, whereby the sieving is subject to Material flows along the screens from the high end to the low end. 4.) Device according to claim 3, characterized by devices above the sieves for receiving a continuous stream of material to be sieved, to split this stream into equal parts which the number Sieves corresponds, and for emptying the individual parts on the individual sieves near the high ends of the sieves. 5.) Device according to claim 1, characterized by transversely extending, funnel-like devices at the outlet ends of each sieve for receiving and merging the stream of oversized material in a lateral direction for delivery to the longitudinal line. 6.) Device according to claim 3, characterized by transversely extending, funnel-like devices at the lower ends of each sieve for receiving and merging the stream of oversized material laterally and towards the Delivery to the longitudinal line.