US3221877A - Bar screen - Google Patents

Bar screen Download PDF

Info

Publication number
US3221877A
US3221877A US239266A US23926662A US3221877A US 3221877 A US3221877 A US 3221877A US 239266 A US239266 A US 239266A US 23926662 A US23926662 A US 23926662A US 3221877 A US3221877 A US 3221877A
Authority
US
United States
Prior art keywords
bars
screen
section
bridge
bar
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
US239266A
Other languages
English (en)
Inventor
Koning Jacob De
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US3221877A publication Critical patent/US3221877A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/04—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices according to size
    • B07B13/07—Apparatus in which aggregates or articles are moved along or past openings which increase in size in the direction of movement

Definitions

  • the present invention relates to a screen with srceen bars clamped on the side of the feed only.
  • Screens of this type are used for screening material containing particles of widely divergent grain size, such as run-of-mine coal.
  • the object is to separate off a considerable portion of the fine material quickly and in a simple way, so that the classifying screens, handling the coarse material, are less heavily loaded.
  • the known screening devices have the drawback that the slots between the bars frequently get obstructed by particles of about equal size being pressed into the slots between the bars by the large lumps sliding over the screen deck.
  • the capacity of the screening device decreases, in consequence of which a large portion of the fine material is not separated off and the screen has to be frequently stopped for cleaning.
  • some improvement can be achieved by the use of shaker screens or vibrating screens.
  • this renders the screening device complex and expensive.
  • the slots can diverge to a small degree only, so that these screens, too, frequently get obstructed.
  • This invention has for its primary object the provision of a device for screening material of widely diverging grain size, which does not get obstructed and can be built as a stationary screen.
  • the size to which the cut is made is substantially determined by the distance between the elastic and the more rigid bars.
  • the material sliding over the surface of the screen will exert such a force on this particle that the elastic bar is bent or deflected sideways.
  • the slot between the bars will widen and diverge towards the discharge end.
  • the particle jammed between the bars will now fall through the screen or be pushed forwards by the material sliding over the screen and fall through the screen at a point where the slot is sufficiently wide. In this way, the screen keeps itself clean, so that it can no longer be obstructed.
  • the upper surface of the elastic bars is at a lower lever than that of the more rigid bars, the big heavy lumps are carried by the latter, so that the elastic bars, which are of course weaker, are not loaded by them.
  • the elastic bars are circular in section so as to enable them to deflect to the same extent in all directions.
  • the other bars are strengthened vertically, so that their stiffness in this direction suflices for carrying the weight of the big lumps present in the material to be screened.
  • These bars preferably consist of a bar of circular section and a bar of rectangular section having its shorter side welded onto the undersurface of the firstmentioned bar, the horizontal centerlines of the circular section part and of the elastic bars being at the same level. In this way, it is achieved that bending of an elastic bar is always allegedlyd with an increase of the slot width "ice between the bars.
  • the rigid bars may be clamped or supported on both ends, while they may furthermore be designed so as to be capable of deflecting sideways if necessary.
  • FIG. 1 is a perspective view of a screen according to the invention
  • FIG. 2 is a perspective view of -a screen section drawn to a larger scale
  • FIG. 3 shows a cross-sectional view of the screen bar attachment.
  • the material to be screened for instance run-of-mine coal, is supplied to a pre-grading screen 2 by a belt conveyor 1.
  • the pre-grading screen is provided with a number of Stepped screen sections 3 mounted between two side walls 4, only one of which is shown in the drawing to allow a better view of the construction.
  • Each of the screen sections comprises a bridge 5 with downwardly flanged edges 6 in which holes 7 are drilled for fastening the bridges to the side walls 4.
  • the ends of screen bars 8 are welded to the undersurface of the bridges at regular intervals.
  • Each of the screen bars consists of a round bar 9 and a fiat bar 10.
  • Each flat bar 10 is rectangular in cross section and right triangular in longitudinal section with its shorter side being welded onto the undersurface of the associated round bar 9, so that the screen bar is stiffened vertically. Near the bridge the height of the bar 10 is greater than near the free end. Between the bars 8 thin bars 11 of circular cross-section are provided.
  • One of the ends of these bars is fastened to the unde'rsurface of the bridge by means of a clamping plate 12 and bolts 13, so that the bars can be quickly replaced when worn.
  • a clamping plate 12 and bolts 13 Welded against the undersurface of the bridge at the points where the thin bars 11 are to be mounted are filling plates 14 so that, after the bars have been clamped into position, the upper surface of these bars is at a lower lever than that of the bars 8.
  • the thickness of the filling plate is such that the horizontal centerlines of the bars 9 and 11 are at the same level. If the bar 11 bends, the slot between the two bars widens, so that a particle which has got jammed between the bars cannot remain there, but falls through the screen.
  • the material supplied slides onto the bridge 5 of the first screen section.
  • the bars attached to this bridge are set at such an angle that the material will slide along the screen deck by its own weight.
  • a suitable angle of slope for dry-screening is 20 to 25.
  • the distance between the bars 8 and 11 in the embodiment is 60 mm., the elastic bars 11 having a diameter of 16 mm. and a length of 600 mm.- Owing to the elasticity of the bars 11 the effective size to which the cut is made exceeds the actual slot width.
  • the oversize is fed from the screening device to a moving screen which has to perform a high precision separation at 90 mm.
  • the load of this screen is considerably reduced by the application of the pre-grading screen according to the invention, so that a small and, consequently, cheap screen will suffice.
  • the load of the screen described in the example was found to be only 20% of the weight of the material supplied to device 2.
  • a device for screening and sizing material comprising a stationary screen having a plurality of screening bars secured only at their material feed end and extending beside each other in the material feed direction, said bars being alternately of high and low elasticity, and means for securing said bars at their material feed ends and for causing the upper surface of the bars of low elasticity to be at a higher level than the upper surface of the bars of high elasticity throughout the lengths of the respective bars.
  • each of the bars of low elasticity include a respective circular section and secured to the undersurface thereof a rigidizing rectangular section.
  • said securing means includes a bridge to the underside of which all of said bars are clamped at their said material feed ends, said bridge extending in the material feed direction beyond the point where the bars are clamped a predetermined distance sufiicient for desired screening.
  • a device as in claim 6 including a plurality of screens each as recited therein disposed in series with the clamped ends of the bars of each screen being under the free ends of the bars of the preceding screen.
  • each of the said bars of high elasticity are circular in section, each of the bars of low elasticity having a first portion of circu lar cross section and a second portion of rectangular cross section and a generally triangular longitudinal cross section with its shorter side being welded onto the undersurface of the respective first portion so that the longer end of the second portion is adjacent the bridge to which the bar is clamped, the horizontal centerlines of the circular section of the low elasticity bars being at the same level.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Basic Packing Technique (AREA)
US239266A 1961-11-28 1962-11-21 Bar screen Expired - Lifetime US3221877A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL271936 1961-11-28

Publications (1)

Publication Number Publication Date
US3221877A true US3221877A (en) 1965-12-07

Family

ID=19753444

Family Applications (1)

Application Number Title Priority Date Filing Date
US239266A Expired - Lifetime US3221877A (en) 1961-11-28 1962-11-21 Bar screen

Country Status (3)

Country Link
US (1) US3221877A (es)
ES (1) ES282848A1 (es)
GB (1) GB958739A (es)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3572505A (en) * 1969-12-11 1971-03-30 Stamicarbon Screening device
US4071193A (en) * 1976-07-19 1978-01-31 The Black Clawson Company Method of and apparatus for flow spreading
US4400268A (en) * 1979-09-07 1983-08-23 Buhler-Miag Gmbh Arrangement for piling a bulky material having different grain sizes
WO1992010312A1 (en) * 1990-12-11 1992-06-25 The Read Corporation Material sizing apparatus with rod-vibrating decks
US5219078A (en) * 1990-12-11 1993-06-15 The Read Corporation Material separating and sizing apparatus with vibrating rods and method
WO1994009089A1 (en) * 1992-10-08 1994-04-28 The Read Corporation Waste material separating apparatus and method
US5375774A (en) * 1991-07-18 1994-12-27 Perry; Timothy J. Tip separator and method of operation for fluorescent tube digester
US5769240A (en) * 1995-10-11 1998-06-23 Western Wire Works, Inc. Screening systems and methods for screening particulate material
US5816412A (en) * 1996-04-02 1998-10-06 Western Wire Works, Inc. Screening systems and methods for screening particulate material
US6070737A (en) * 1997-12-30 2000-06-06 Western Wire Works, Inc. Screening systems and methods for screening particulate material
US6116428A (en) * 1998-08-03 2000-09-12 Desiter Machine Company, Inc. Finger screen deck assembly
US20040074815A1 (en) * 2002-09-19 2004-04-22 Hmh Engineering - Consulting Trading Gmbh Apparatus for separating coarse grain and fine grain
WO2004069430A1 (en) * 2003-02-03 2004-08-19 Svante Björk AB Arrangement for separation of particles, and a separation method in connection with a process for manufacturing power cables
US20080110807A1 (en) * 2006-11-10 2008-05-15 Allain Equipment Manufacturing Ltd. Screen for Particle Separation
EP2042244A2 (de) * 2007-09-25 2009-04-01 Michael Meserle Verfahren und Vorrichtung zum Entfernen von Staub und/oder faserförmigen Beimengungen aus einem Kunststoffgranulat
WO2013096972A1 (en) * 2011-12-23 2013-06-27 Holmberg Tim Adjustable spring grizzly bar material separator
US11260325B2 (en) * 2020-01-06 2022-03-01 Tongji University Filtering device for removing impurities in a mixture of biological diatomite

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4865720A (en) * 1986-03-19 1989-09-12 Gilmore Larry J Debris separator system
AUPN550295A0 (en) * 1995-09-15 1995-10-12 Act Electricity & Water Filter

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US760590A (en) * 1901-09-20 1904-05-24 Edward J Vodra Grading-machine.
US850447A (en) * 1905-11-01 1907-04-16 Invincible Grain Cleaner Company Separating or grading machine.
US910904A (en) * 1908-06-04 1909-01-26 Thomas Chipera Sieve for fanning-mills.
US2443176A (en) * 1945-02-21 1948-06-15 Us Interior V-opening screen
DE1017840B (de) * 1955-09-06 1957-10-17 Ulrich Hagemann Anordnung zum gewichtsmaessigen Trennen groessenmaessig vorsortierter Teile
FR1263873A (fr) * 1960-04-26 1961-06-19 Babbitless Sa Crible pour matières diverses et notamment pour ordures ménagères

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US760590A (en) * 1901-09-20 1904-05-24 Edward J Vodra Grading-machine.
US850447A (en) * 1905-11-01 1907-04-16 Invincible Grain Cleaner Company Separating or grading machine.
US910904A (en) * 1908-06-04 1909-01-26 Thomas Chipera Sieve for fanning-mills.
US2443176A (en) * 1945-02-21 1948-06-15 Us Interior V-opening screen
DE1017840B (de) * 1955-09-06 1957-10-17 Ulrich Hagemann Anordnung zum gewichtsmaessigen Trennen groessenmaessig vorsortierter Teile
FR1263873A (fr) * 1960-04-26 1961-06-19 Babbitless Sa Crible pour matières diverses et notamment pour ordures ménagères

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3572505A (en) * 1969-12-11 1971-03-30 Stamicarbon Screening device
US4071193A (en) * 1976-07-19 1978-01-31 The Black Clawson Company Method of and apparatus for flow spreading
US4400268A (en) * 1979-09-07 1983-08-23 Buhler-Miag Gmbh Arrangement for piling a bulky material having different grain sizes
WO1992010312A1 (en) * 1990-12-11 1992-06-25 The Read Corporation Material sizing apparatus with rod-vibrating decks
US5219078A (en) * 1990-12-11 1993-06-15 The Read Corporation Material separating and sizing apparatus with vibrating rods and method
US5322170A (en) * 1990-12-11 1994-06-21 The Read Corporation Waste material separating apparatus and method
US5398815A (en) * 1990-12-11 1995-03-21 The Read Corporation Landfill waste material separating method
US5375774A (en) * 1991-07-18 1994-12-27 Perry; Timothy J. Tip separator and method of operation for fluorescent tube digester
WO1994009089A1 (en) * 1992-10-08 1994-04-28 The Read Corporation Waste material separating apparatus and method
US5769240A (en) * 1995-10-11 1998-06-23 Western Wire Works, Inc. Screening systems and methods for screening particulate material
US5816412A (en) * 1996-04-02 1998-10-06 Western Wire Works, Inc. Screening systems and methods for screening particulate material
US6070737A (en) * 1997-12-30 2000-06-06 Western Wire Works, Inc. Screening systems and methods for screening particulate material
US6116428A (en) * 1998-08-03 2000-09-12 Desiter Machine Company, Inc. Finger screen deck assembly
US20040074815A1 (en) * 2002-09-19 2004-04-22 Hmh Engineering - Consulting Trading Gmbh Apparatus for separating coarse grain and fine grain
US7011217B2 (en) * 2002-09-19 2006-03-14 HMH Engineering—Consulting Trading GmbH Apparatus for separating coarse grain and fine grain
WO2004069430A1 (en) * 2003-02-03 2004-08-19 Svante Björk AB Arrangement for separation of particles, and a separation method in connection with a process for manufacturing power cables
US20060021918A1 (en) * 2003-02-03 2006-02-02 Bjoerk Svante Arrangement for separation of particles, and a separation method in connection with a process for manufacturing power cables
US20080110807A1 (en) * 2006-11-10 2008-05-15 Allain Equipment Manufacturing Ltd. Screen for Particle Separation
EP2042244A2 (de) * 2007-09-25 2009-04-01 Michael Meserle Verfahren und Vorrichtung zum Entfernen von Staub und/oder faserförmigen Beimengungen aus einem Kunststoffgranulat
EP2042244A3 (de) * 2007-09-25 2011-03-23 Michael Meserle Verfahren und Vorrichtung zum Entfernen von Staub und/oder faserförmigen Beimengungen aus einem Kunststoffgranulat
WO2013096972A1 (en) * 2011-12-23 2013-06-27 Holmberg Tim Adjustable spring grizzly bar material separator
US8708154B1 (en) 2011-12-23 2014-04-29 Tim Holmberg Adjustable spring grizzly bar material separator
US20150129467A1 (en) * 2011-12-23 2015-05-14 Tim Holmberg Adjustable spring grizzly bar material separator
US11260325B2 (en) * 2020-01-06 2022-03-01 Tongji University Filtering device for removing impurities in a mixture of biological diatomite

Also Published As

Publication number Publication date
GB958739A (en) 1964-05-27
ES282848A1 (es) 1963-04-16

Similar Documents

Publication Publication Date Title
US3221877A (en) Bar screen
US10507494B2 (en) Vibrating screen deck deflector systems and methods
SE435585B (sv) Sallanordning
US5699918A (en) Screen for vibrating material sorting apparatus
EP3251759B1 (en) A multi-deck screening assembly
US3169111A (en) Dewatering screen having liquid film disrupting barrier
US2853191A (en) Method and apparatus for classifying fine grained matter according to size
US3756405A (en) Separating apparatus and method
US3572505A (en) Screening device
US4126543A (en) Method and apparatus for screening particulate materials
US1939314A (en) Separator for coal and the like
RU2405633C1 (ru) Многоситный вибрационный грохот
GB2067099A (en) Vibratory screening feeder
US1138245A (en) Device for sorting and feeding refuse.
SU1669590A1 (ru) Пневмоклассификатор сыпучего материала
US546891A (en) Screening apparatus
SU1176976A1 (ru) Пневмосепаратор сыпучих материалов
US2875895A (en) Sizing machine
US2572177A (en) Method of classifying or separating comminuted material according to size
US3045823A (en) Process and apparatus for separating a mixture of particles according to size
SE460582B (sv) Sorteringsanordning
SU1311786A1 (ru) Ситова рама дл рассевов с круговым поступательным движением
SU1450886A1 (ru) Классификатор сыпучих материалов
SU1699654A1 (ru) Сито
SE505792C2 (sv) Materialseparationsanordning