US3012674A - Oscillating screen structure - Google Patents

Oscillating screen structure Download PDF

Info

Publication number
US3012674A
US3012674A US742128A US74212858A US3012674A US 3012674 A US3012674 A US 3012674A US 742128 A US742128 A US 742128A US 74212858 A US74212858 A US 74212858A US 3012674 A US3012674 A US 3012674A
Authority
US
United States
Prior art keywords
wires
system
screen
constituent
parallel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US742128A
Inventor
Hoppe Gerhard
Original Assignee
Hoppe Gerhard
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hoppe Gerhard filed Critical Hoppe Gerhard
Priority to US742128A priority Critical patent/US3012674A/en
Application granted granted Critical
Publication of US3012674A publication Critical patent/US3012674A/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPERATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, OR SIFTING OR BY USING GAS CURRENTS; OTHER SEPARATING BY DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • B07B1/4672Woven meshes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPERATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, OR SIFTING OR BY USING GAS CURRENTS; OTHER SEPARATING BY DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/48Stretching devices for screens

Description

Dec. 12, 1961 HOPPE OSCILLATING SCREEN STRUCTURE 2 Sheets-Sheet 1 Filed June 16. 1958 Dec. 12, 1961 e. HOPPE oscmmmc SCREEN STRUCTURE 2 Sheets-Sheet 2 Filed June 16. 1958 a 57 1 2 41 b m w v W L. a w a b b M a m: F

b v a W D m w r l a m f w v. s c

te tates ice 3,012,674 OCILLATING SCREEN STRUCTURE Gerhard ll-foppe, Frankiiampstrabe 69A, Gelsenkirchen, Germany Filed June 16, 1958, der. No. 742,128 4 (Ilaims. (Cl. 209-491) This invention has reference to screens as used for separating particles of different size.

Oscillating screens or sieves serving the above purpose have often a tendency to become clogged, particularly if the particles to be separated are wet or damp.

It is, therefore, one object of this invention to provide screens for separating particles of different size which have not the tendency to clog.

There are prior art screens wherein the danger of clogging has been successfully avoided. These non-clogging screens are, however, subject to various limitations and/ or drawbacks, and all of them are relatively complicated.

It is, therefore, another object of this invention to provide non-clogging or self-cleaning screens which, though highly effective, are simple, easy to manufacture and inexpensive.

Further objects and advantages of the invention will become apparent as the following description proceeds, and the features of novelty which characterize the invention will be pointed out with particularity in the claims annexed to, and forming part of, this specification.

For a better understanding of the invention reference may be had to the accompanying drawings in which-- FIG. 1 shows in form of an isometric view a screen embodying this invention in combination with a conventional oscillatory frame supporting the same;

FIG. la is a top-plan view of the screen structure of FIG. 1 shown on a larger scale;

FIG. 2 is a top-plan View of a modification of the screen structure shown in FIG. la;

FIG. 3 is a top-plan view of another screen structure having operating characteristics similar to those of the structures of FEGS. 12; and

FIG. 4 is a section along A-A of FIG. 3.

Referring now to the drawings, and more particularly to FIG. 1 thereof, reference letters a have been applied to indicate an upper sieve frame. Upper frame a is supported on a base or base frame 0 by means of four resilient rods or springs e of which but two can be seen in FIG. 1. Frame a supports the screen proper to which reference letter b has been applied. The screen proper has been shown but diagrammatically in FIG. 1. The woven screen structures fully shown in FIG. 1a and FIG. 2 are intended to take the place of the screen proper indicated by reference letter b in FIG. 1. A pair of helical springs f interconnects upper frame a and lower frame c. Lower frame c' is supported by a plurality of springs f" of which but two have been shown in FIG. 1. A shaft g projects transversely across upper frame a and is adapted to be rotated byan electric motor (not shown), supported by frame a. Shaft g supports an eccentric weight d, is. a weight whose center of gravity is spaced from the longitudinal axis of shaft g. As a result. frame a and sieve b will be caused to oscillate, or vibrate, when shaft ,9 and weight d are rotated.

Referring now to FIG. la, the woven wire screen shown therein comprises weft wires interwoven with warp wires. The terms weft wires and warp as applied to the screen shown in FIG. la are intended to indicate that the wires extend at right angles and are interwoven in the fashion of yarn of which textile materials are made. The wires referred to as weft wires may extend either in a direction longitudinally of frame a and in transverse direction. The same applies as to the wires referred-to as warp wires. In FIG. la wires a, b may be considered as weft wires and wires 0 as Warp wires. The woven sieve structure of FIG. la comprises a first system of parallel wires 11 and a second system of parallel wires b. Wires a and b are arranged in parallel and are interleaving, and the stretchability of wires a in a direction longitudinally thereof differs from the stretchability of wires b in a direction longitudinally thereof. The difference in stretchability between the wires a forming a first system of wires and the wires b forming a second system of wires is sufiiciently large to establish a tendency of relative movement between the constituent wires of said first system and the constituent wires of said second system when the screen oscillates under load conditions as an integral part of the structure of FIG. 1, or in an equivalent arrangernent.

The difference in stretchability between the wires a and the wires b may be achieved in a number of ways. Both wires a and b may be made of the same material but their cross-section may differ as indicated in FIG. 1a. As an alternative, the difference in stretchability may be achieved by selecting different materials for wires a and 1). Another means of obtaining twosystems of parallel wires a, b and of establishing a substantial difference in the stretchability thereof is to impart a different bias to the constituent wires of each system, in which case the wires may be made of the same material and have equal cross-sections. As a further alternative for achieving substantially different degrees of stretchability one may resort to auxiliary spring means for controlling the bias of either system of parallel wires a, b as will be more fully explained in connection with FIGS. 3 and 4.

I Referring now to FIG. 2, the wire screen shown therein comprises four systems of wires. Reference character a has been applied to indicate a system of horizontal wires, reference character b has been applied to indicate.

another system of horizontal wires, reference character a has been applied to indicate a system of vertical wires, and reference character b has been applied to indicate another system of vertical wires. Horizontal wires a, b are arranged in interleaving relation and the same applies to vertical wires a, b. The stretchability of horizontal wires a differs from the stretchability of horizontal wires b and the stretchability of vertical wires a differs. from the stretchability of vertical wires b. The constituent wires of the two systems of horizontal wires a, b are interwoven with the constituent wires of the two systems of vertical wires a, b in the fashion clearly shown in FIG. 2.

Referring now to FIGS. 3 and 4, the structure shown therein comprises a first system of parallel wires a and a second system of parallel wires b. Wires b are arranged parallel to and interleaving with wires a. Wires a and b may be made of the same material and may have equal cross-sections. The frame structure for supporting wires a and b includes two parallel bars c made of a relatively inflexible or non-resilient material and four bars e made of a relatively flexible or resilient material. Bars e are arranged below bars 0, and separated from each other by spacer bars 01. A continuous wire a may be wound around bars 0 only, whereas a continuous wire b may be wound around bars e and bars 0, as clearly shown in FIG. 4. The spacer bars (1 are clamped against bars 0, thus preventing unwinding of wire a in case that the same should break at any point thereof. The structure further comprises clamping bars f having lateral grooves g for clamping the turns of continuous wire b against spacer bars d, thus precluding unwinding of the turn of Wire b in case that the same should break at any point thereof. The clamping action of bars d and f is achieved by a number of screws h arranged in spaced relation from each other i and projecting transversely through bars f and d into bars 0.

It will be apparent from the foregoing that though Patented Dec. 12, 196i wires a and b may have inherently the same stretchability in a direction longitudinally thereof, a different stretchability is imparted to wires (1 and b by virtue of the different nature of the terminal supports and e thereof.

The structures shown in the drawings are primarily intended for grading moist coal of relatively small particle size, but may also be used for, and/or adapted for, other purposes.

It will be understood that, although I have shown and described in detail but preferred embodiments of my invention, the invention is not limited thereto, and the illustrated embodiments may be modified and other embodiments made without departing from the spirit and scope or" the invention as set forth in the accompanying claims.

I claim as my invention:

1. In combination a woven screen for separating particles of difierent sizes and means for imparting an oscillatory motion to said screen, said screen comprising weft wires interwoven with warp wires, said weft wires forming a first system and a second system of parallel screen wires, the constituent wires of said second system being arranged parallel to and interleaving with the constituent wires of said first system, the constituent wires of said second system being adapted to have a different stretchability in a direction longitudinally thereof than the constituent wires of said first system, and the difference in stretchability between the constituent wires of said first system and the constituent wires of said second system being sufficiently large to establish a tendency of relative movement between the constituent wires of said first system and the constituent wires of said second system when said screen oscillates under load conditions.

2. In combination a woven screen for separating particles of diiferent sizes and means for imparting an oscillatory motion to said screen, said screen comprising weft wires interwoven with warp wires, said weft wires forming a first system and a second system of parallel wires, the constituent wires of said second system being arranged parallel to and interleaving with the constituent wires of said first system, the constituent wires of said second system being of a material different from that of the constituent wires of said first system, and the properties of the material of the constituent wires of said first system and of the material of the constituent wires of said second system being adapted to establish a tendency of relative movement between the constituent wires of said first system and the constituent wires of said second system when said screen oscillates under load conditions.

3. In combination a woven screen for separating particles of different sizes and means for imparting an oscillatory motion to said screen, said screen comprising weft wires interwoven with warp wires, said weft Wires forming a first system and a second system of parallel Wires, the constituent wires of said second system being arranged parallel to and interleaving with the constituent wires of said first system, and the constituent wires of said second system having a sufficiently different bias from the constituent wires of said first system to establish a tendency of relative movement between the constituent wires of said first system and the constituent wires of said second system when said screen osciilates under load conditions.

4. In combination a woven screen for separating particles of different sizes and means for imparting an oscillatory motion to said screen, said screen comprising a first system of parallel wires and a second system of parallel wires, the constituent wires or" said first system and the constituent wires of said second system being arranged in parallel interleaving relation and being adapted to have a different stretchability in a direction longitudinally thereof, said screen further comprising a third system of parallel wires and a fourth system of parallel wires, the constituent wires of said third system and the constituent Wires of said fourth system being arranged in parallel interleaving relation and being adapted to have a different stretchability in a direction longitudinally thereof, and the constituent wires of said first system and of said second system being arranged at right angles to and interwoven with the constituent wires of said third system and said fourth system.

References Cited in the file of this patent UNITED STATES PATENTS

US742128A 1958-06-16 1958-06-16 Oscillating screen structure Expired - Lifetime US3012674A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US742128A US3012674A (en) 1958-06-16 1958-06-16 Oscillating screen structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US742128A US3012674A (en) 1958-06-16 1958-06-16 Oscillating screen structure

Publications (1)

Publication Number Publication Date
US3012674A true US3012674A (en) 1961-12-12

Family

ID=24983594

Family Applications (1)

Application Number Title Priority Date Filing Date
US742128A Expired - Lifetime US3012674A (en) 1958-06-16 1958-06-16 Oscillating screen structure

Country Status (1)

Country Link
US (1) US3012674A (en)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52105167U (en) * 1976-02-07 1977-08-10
JPS52111964U (en) * 1976-02-23 1977-08-25
JPS52118280U (en) * 1976-03-06 1977-09-07
JPS5348272A (en) * 1977-10-26 1978-05-01 Mitsuboshi Belting Ltd Rubber screen in polyurethane for vibration screen
US4120785A (en) * 1976-02-23 1978-10-17 Mitsuboshi Belting Limited Rubber screens for vibratory screening apparatus
US5944197A (en) * 1997-04-24 1999-08-31 Southwestern Wire Cloth, Inc. Rectangular opening woven screen mesh for filtering solid particles
US5967336A (en) * 1997-09-02 1999-10-19 Southwestern Wire Cloth, Inc. Vibrating screen assembly with improved frame
WO2001032291A1 (en) * 1999-11-03 2001-05-10 Varco I/P, Inc. A screen, a screen arrangement and a screen vibratory system
US6305549B1 (en) 1999-07-06 2001-10-23 Southwestern Wire Cloth, Inc. Vibrating screen assembly of dissimilar materials
US6439392B1 (en) 1997-09-02 2002-08-27 Southwestern Wire Cloth, Inc. Vibrating screen assembly with tubular frame
WO2004089558A2 (en) * 2003-04-12 2004-10-21 United Wire Limited Filtering screen
US20060243643A1 (en) * 2002-11-06 2006-11-02 Eric Scott Automatic separator or shaker with electromagnetic vibrator apparatus
US20090057206A1 (en) * 2007-08-31 2009-03-05 Thomas Robert Larson Shale shaker screens with aligned wires
US8113356B2 (en) 2008-10-10 2012-02-14 National Oilwell Varco L.P. Systems and methods for the recovery of lost circulation and similar material
US8118172B2 (en) 2005-11-16 2012-02-21 National Oilwell Varco L.P. Shale shakers with cartridge screen assemblies
US8133164B2 (en) 2008-01-14 2012-03-13 National Oilwell Varco L.P. Transportable systems for treating drilling fluid
US8172740B2 (en) 2002-11-06 2012-05-08 National Oilwell Varco L.P. Controlled centrifuge systems
US8201693B2 (en) 2006-05-26 2012-06-19 National Oilwell Varco, L.P. Apparatus and method for separating solids from a solids laden liquid
US8231010B2 (en) 2006-12-12 2012-07-31 Varco I/P, Inc. Screen assemblies and vibratory separators
US8312995B2 (en) 2002-11-06 2012-11-20 National Oilwell Varco, L.P. Magnetic vibratory screen clamping
US8316557B2 (en) 2006-10-04 2012-11-27 Varco I/P, Inc. Reclamation of components of wellbore cuttings material
US8556083B2 (en) 2008-10-10 2013-10-15 National Oilwell Varco L.P. Shale shakers with selective series/parallel flow path conversion
US8561805B2 (en) 2002-11-06 2013-10-22 National Oilwell Varco, L.P. Automatic vibratory separator
US8622220B2 (en) 2007-08-31 2014-01-07 Varco I/P Vibratory separators and screens
US9073104B2 (en) 2008-08-14 2015-07-07 National Oilwell Varco, L.P. Drill cuttings treatment systems
US9079222B2 (en) 2008-10-10 2015-07-14 National Oilwell Varco, L.P. Shale shaker
US9643111B2 (en) 2013-03-08 2017-05-09 National Oilwell Varco, L.P. Vector maximizing screen

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US910904A (en) * 1908-06-04 1909-01-26 Thomas Chipera Sieve for fanning-mills.
US1190221A (en) * 1914-11-30 1916-07-04 Alvin A Daugherty Sack.
DE354143C (en) * 1922-06-02 Louis Herrmann Fa Slot screen from reared on transverse webs Profildraehten
FR724931A (en) * 1931-10-21 1932-05-04 Improvements to multiple electrical connecting strips and trades for their manufacture
FR821870A (en) * 1936-05-19 1937-12-15 Improvements to screening funds
US2314880A (en) * 1941-05-23 1943-03-30 Richard D Heller Screen
DE1017840B (en) * 1955-09-06 1957-10-17 Ulrich Hagemann An arrangement for separating gewichtsmaessigen groessenmaessig presorted parts
US2837210A (en) * 1949-06-27 1958-06-03 Ackert Rudolf Oscillating sieves, screens or the like
US2893442A (en) * 1953-03-30 1959-07-07 Genin Paul Reinforcing woven materials for making laminated articles

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE354143C (en) * 1922-06-02 Louis Herrmann Fa Slot screen from reared on transverse webs Profildraehten
US910904A (en) * 1908-06-04 1909-01-26 Thomas Chipera Sieve for fanning-mills.
US1190221A (en) * 1914-11-30 1916-07-04 Alvin A Daugherty Sack.
FR724931A (en) * 1931-10-21 1932-05-04 Improvements to multiple electrical connecting strips and trades for their manufacture
FR821870A (en) * 1936-05-19 1937-12-15 Improvements to screening funds
US2314880A (en) * 1941-05-23 1943-03-30 Richard D Heller Screen
US2837210A (en) * 1949-06-27 1958-06-03 Ackert Rudolf Oscillating sieves, screens or the like
US2893442A (en) * 1953-03-30 1959-07-07 Genin Paul Reinforcing woven materials for making laminated articles
DE1017840B (en) * 1955-09-06 1957-10-17 Ulrich Hagemann An arrangement for separating gewichtsmaessigen groessenmaessig presorted parts

Cited By (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS554072Y2 (en) * 1976-02-07 1980-01-30
JPS52105167U (en) * 1976-02-07 1977-08-10
JPS554069Y2 (en) * 1976-02-23 1980-01-30
US4120785A (en) * 1976-02-23 1978-10-17 Mitsuboshi Belting Limited Rubber screens for vibratory screening apparatus
JPS52111964U (en) * 1976-02-23 1977-08-25
JPS52118280U (en) * 1976-03-06 1977-09-07
JPS554070Y2 (en) * 1976-03-06 1980-01-30
JPS5348272A (en) * 1977-10-26 1978-05-01 Mitsuboshi Belting Ltd Rubber screen in polyurethane for vibration screen
JPS5733387B2 (en) * 1977-10-26 1982-07-16
US5944197A (en) * 1997-04-24 1999-08-31 Southwestern Wire Cloth, Inc. Rectangular opening woven screen mesh for filtering solid particles
US6439392B1 (en) 1997-09-02 2002-08-27 Southwestern Wire Cloth, Inc. Vibrating screen assembly with tubular frame
US5967336A (en) * 1997-09-02 1999-10-19 Southwestern Wire Cloth, Inc. Vibrating screen assembly with improved frame
US6269954B1 (en) 1997-09-02 2001-08-07 Southwestern Wire Cloth, Inc. Seal for adjoining screen assemblies in vibrating machinery
US6305549B1 (en) 1999-07-06 2001-10-23 Southwestern Wire Cloth, Inc. Vibrating screen assembly of dissimilar materials
US6237780B1 (en) * 1999-11-03 2001-05-29 Tuboscope I/P, Inc. Vibratory separator screens
GB2368296A (en) * 1999-11-03 2002-05-01 Varco Int A screen,a screen arrangement and a screen vibratory system
GB2368296B (en) * 1999-11-03 2003-03-26 Varco Int A screen,a screen arrangement and a screen vibratory system
WO2001032291A1 (en) * 1999-11-03 2001-05-10 Varco I/P, Inc. A screen, a screen arrangement and a screen vibratory system
US8746459B2 (en) 2002-10-17 2014-06-10 National Oilwell Varco, L.P. Automatic vibratory separator
US8312995B2 (en) 2002-11-06 2012-11-20 National Oilwell Varco, L.P. Magnetic vibratory screen clamping
US8561805B2 (en) 2002-11-06 2013-10-22 National Oilwell Varco, L.P. Automatic vibratory separator
US8695805B2 (en) 2002-11-06 2014-04-15 National Oilwell Varco, L.P. Magnetic vibratory screen clamping
US20060243643A1 (en) * 2002-11-06 2006-11-02 Eric Scott Automatic separator or shaker with electromagnetic vibrator apparatus
US8172740B2 (en) 2002-11-06 2012-05-08 National Oilwell Varco L.P. Controlled centrifuge systems
US7571817B2 (en) 2002-11-06 2009-08-11 Varco I/P, Inc. Automatic separator or shaker with electromagnetic vibrator apparatus
US20060081529A1 (en) * 2003-04-12 2006-04-20 United Whire Limited Filtering screen
US8104623B2 (en) 2003-04-12 2012-01-31 United Wire Limited Filtering screen
GB2401803B (en) * 2003-04-12 2005-08-03 United Wire Ltd Filtering screen
WO2004089558A3 (en) * 2003-04-12 2005-03-24 United Wire Ltd Filtering screen
WO2004089558A2 (en) * 2003-04-12 2004-10-21 United Wire Limited Filtering screen
US8246771B2 (en) 2003-04-12 2012-08-21 United Wire Limited Filtering screen
US8118172B2 (en) 2005-11-16 2012-02-21 National Oilwell Varco L.P. Shale shakers with cartridge screen assemblies
US8201693B2 (en) 2006-05-26 2012-06-19 National Oilwell Varco, L.P. Apparatus and method for separating solids from a solids laden liquid
US8533974B2 (en) 2006-10-04 2013-09-17 Varco I/P, Inc. Reclamation of components of wellbore cuttings material
US8316557B2 (en) 2006-10-04 2012-11-27 Varco I/P, Inc. Reclamation of components of wellbore cuttings material
US8231010B2 (en) 2006-12-12 2012-07-31 Varco I/P, Inc. Screen assemblies and vibratory separators
US20090057206A1 (en) * 2007-08-31 2009-03-05 Thomas Robert Larson Shale shaker screens with aligned wires
US8622220B2 (en) 2007-08-31 2014-01-07 Varco I/P Vibratory separators and screens
US7980392B2 (en) * 2007-08-31 2011-07-19 Varco I/P Shale shaker screens with aligned wires
US8133164B2 (en) 2008-01-14 2012-03-13 National Oilwell Varco L.P. Transportable systems for treating drilling fluid
US9073104B2 (en) 2008-08-14 2015-07-07 National Oilwell Varco, L.P. Drill cuttings treatment systems
US8556083B2 (en) 2008-10-10 2013-10-15 National Oilwell Varco L.P. Shale shakers with selective series/parallel flow path conversion
US8113356B2 (en) 2008-10-10 2012-02-14 National Oilwell Varco L.P. Systems and methods for the recovery of lost circulation and similar material
US9677353B2 (en) 2008-10-10 2017-06-13 National Oilwell Varco, L.P. Shale shakers with selective series/parallel flow path conversion
US9079222B2 (en) 2008-10-10 2015-07-14 National Oilwell Varco, L.P. Shale shaker
US9643111B2 (en) 2013-03-08 2017-05-09 National Oilwell Varco, L.P. Vector maximizing screen

Similar Documents

Publication Publication Date Title
US3410055A (en) Expandable bed filter and method
CA1230856A (en) Multi-dimensional screen
US1997713A (en) Screen and method of making same
US3970549A (en) Screen assembly and dewatering technique
US3226989A (en) Vibratory screen systems
CA2382677C (en) A screen, a screen arrangement and a screen vibratory system
US3452876A (en) Dewatering equipment
MX171519B (en) Under sifter
US1242982A (en) Screening device.
WO1985000556A1 (en) Electrostatic dissipating fabric
US3191896A (en) Vibration pad
GB814554A (en) Improvements in or relating to articles of furniture, such as chairs or the like
US1879377A (en) Screen and method of making the same
US2142728A (en) Perforating device
US3716138A (en) Screen
US2882024A (en) Apparatus for the vibrational treatment of material of a nature ranging from granular to pulverulent nature
GB1526663A (en) Vibratory screening apparatus for finely divided material
GB2134214A (en) Sifter stroke screening unit
DE04029422T1 (en) Sieve for vibrating machine
US2246483A (en) dillon
US3325007A (en) Screen with vibration-isolated vibration generator
US4810372A (en) Dry material separator
DE1935153A1 (en) Self cleaning filter for the removal of dust from gases
US2297486A (en) Conveying apparatus
US3169111A (en) Dewatering screen having liquid film disrupting barrier