EP0148814A1 - Surface criblante - Google Patents

Surface criblante

Info

Publication number
EP0148814A1
EP0148814A1 EP83901322A EP83901322A EP0148814A1 EP 0148814 A1 EP0148814 A1 EP 0148814A1 EP 83901322 A EP83901322 A EP 83901322A EP 83901322 A EP83901322 A EP 83901322A EP 0148814 A1 EP0148814 A1 EP 0148814A1
Authority
EP
European Patent Office
Prior art keywords
sieve screen
screen
sieve
deck
end edges
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.)
Withdrawn
Application number
EP83901322A
Other languages
German (de)
English (en)
Other versions
EP0148814A4 (fr
Inventor
Jeremy James Lees
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.)
Ilecard Pty Ltd
Original Assignee
Ilecard Pty Ltd
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 Ilecard Pty Ltd filed Critical Ilecard Pty Ltd
Publication of EP0148814A1 publication Critical patent/EP0148814A1/fr
Publication of EP0148814A4 publication Critical patent/EP0148814A4/fr
Withdrawn legal-status Critical Current

Links

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
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/01—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons
    • B01D33/03—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with vibrating filter elements
    • B01D33/0346—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with vibrating filter elements with flat filtering elements
    • B01D33/0376—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with vibrating filter elements with flat filtering elements supported
    • B01D33/0392—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with vibrating filter elements with flat filtering elements supported with curved filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
    • B01D33/76—Filters with filtering elements which move during the filtering operation having feed or discharge devices for discharging the filter cake, e.g. chutes
    • B01D33/763—Filters with filtering elements which move during the filtering operation having feed or discharge devices for discharging the filter cake, e.g. chutes for continuously discharging concentrated liquid
    • 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
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B07B1/34—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens jigging or moving to-and-fro perpendicularly or approximately perpendiculary to the plane of the screen

Definitions

  • the present invention relates to a sieve screen deck and more particularly to such a sieve screen deck having a self . supporting sieve screen with side walls which sieve screen may 5 be vibrated over substantially its whole surface.
  • Screen decks are used to separate liquids from a wide ran of solid particulate matter and to separate fines from flowabl streams of particulate matter.
  • a slurry or a mixture of particles is flowed onto the upper end of the screen deck.
  • the mixture flows down a sieve screen in the deck the liquid or fines fall through the apertures in the sieve screen.
  • the sieve screen is rigidly connected to a frame around its full periphery. In a planar screen this is usually done by clamping the sieve screen around its edges t 15 the screen while in the case of a curved sieve screen, i.e. a sieve bend, the curved edges are supported and stiffly held in place by radius bows which are generally wedged in place or fimrly located by springs.
  • the sieving 20 action of such a screen deck may be enhanced by vibrating the screen or by rapping the screen i.e. by applying repeated impacts to one face of the screen or to the screen frame.
  • Rapping is normally done by connecting a rapping bar to the underside of the sieve screen and positioning on the frame, or 25 on the ground beneath the frame a mechanical impacting means which imparts blows in rapid succession to the rapping bar or b vibrating the complete screen and holding frame.
  • the application of the rapping or vibrating force to a curved sieve screen which is rigidly held around its sides to a frame result 30 in only a small part of the sieve screen actually moving.
  • the present invention consists in a sieve screen deck, comprising a self supporting sieve screen having two opposed end edges, rapping or vibrating means to cause the sieve screen to vibrate, and a frame to which the sieve screen is connected, the sieve screen including sieving means defining a plurality of substantially parallel narrow slots and an array of backing bars connected to the sieving means which render the sieve screen self supporting, the sieve screen being connected to the frame only at or adjacent its two end edges and at least one of the connections being through a resilient bush or like means allowing limited vibrational movement between the sieve screen and the frames, a side wall being provided substantially along the full length on each side of the sieve screen between its end edges so as to prevent material which is passing across the sieve screen between the two end edges from flowing over an edge of the sieve screen intermediate the said end edges, each side wall being formed of a resilient synthetic plastics material or rubber such that they do not impede substantially the ability of the sieve screen to vibrate and flex under the influence of the rapping or vibrating means.
  • Side walls to prevent material falling over the side edges of the sieve screen may be formed of a suitable synthetic plastics material or the like and connected to the side edges of the sieve screen.
  • the plastics material should have sufficient resilience that the vibration of the sieve screen is not substantially impeded.
  • the side walls are cast in-situ on the side edges of the sieve screen. In other embodiments they may be clipped on, screwed on or attached in any other suitable manner. It has been found suitable to form the side walls of a polyurethane material which may be cast in-situ or formed separately and attached.
  • the sieve screen is preferably formed of a parallel array of wedge wires lying at right angles to the slope of the screen.
  • the wedge wires are preferably connected to an array of backing bars running longitudinally of the screen parallel to its fall line.
  • a rapping bar is preferably connected to the backing bars parallel to the wedge wires.
  • the screen may be planar or may curve along its length to form a sieve bend.
  • the sieve screen comprises a sheet of metal into which an array of slots has been etched or otherwise formed.
  • the sheet may be inherently self supporting or it may be supported by backing bars as described above
  • the sieve screen is preferably formed with slots having a width of from 10 microns to 4mm, most preferably the slots have a width of from 100 microns to 1mm.
  • the frame of the sieve screen deck is of conventional construction subject to the fact that the screen is only connected along its end edges to the frame.
  • the frame may be welded up from steel or formed in any other suitable manner.
  • the frame may completely surround the sieve screen however in ⁇ other embodiments a plurality of sieve screens may be disposed in side by side array with a single frame supporting all of them in which case each sieve screen is not individually surrounded by the frames.
  • the sieve screen is connected at or adjacent its end edges to the frame.
  • One or both of the ends of the sieve screen are connected to the frame through resilient bushes or like means which allow a limited amount of vibrational movement between the sieve screen and the frame. In a typical situation the bushes might allow a maximum movement of the sieve screen relative to the frames of 2 or 3mm, as compared with a maximum amplitude of vibration of the sieve screen of 5mm.
  • one end of the sieve screen may be rigidly connected to the frame. If the sieve screen is curved it may be desirable to provide adjustable connection means on the frame to attach the sieve screen to the frame. This is due to the fact that the exact curvature varies slightly between screens of the same nominal dimensions.
  • the impact means may be mounted directly onto a rapping bar and be pivotally connected thereto. This arrangement allows greater control to be effected over the vibrations of the sieve screen which can substantially alter the sieving action of the sieve screen deck.
  • the impact means preferably comprises a double acting pneumatic ram having a lug at one end which may be bolted to a corresponding double clevis on the rapping bar.
  • the angle of impact of the piston within the pneumatic ram may be varied by loosening the bolt connecting the ram to the rapping bar and rotating the pneumatic ram about the axis of the bolt. If desired the magnitude of the rapping force may be varied by adding weights to the free end of the piston rod projecting from the pneumatic ram.
  • vibration of the sieve screen is brought about by the oscillation of a vibration bar connected to the underside of the sieve screen ' across its free width intermediate its ends.
  • the vibration bar is pivotally connected to one end of each one of an array of fingers which are rigidly connected at their other end to, and extend radially from, a rod which is caused to reciprocate about its longitudinal axis by the action of a motor rotating an eccentric which actuates a further arm extending radially from the rod.
  • Fig. 1 is a side elevational view of a sieve screen deck according to this invention.
  • Fig. 2 is a rear elevational view of the sieve screen deck of Fig. 1.
  • the sieve screen deck 100 comprises a curved sieve screen 101 mounted in a frame 102 and a vibrating means 103.
  • the frame 102 includes a distribution box 104 on its rear side, which serves to distribute an incoming slurry entering the sieve screen deck 100 through inlet 105 evenly across the width of the sieve screen 101, a pair of side frame members 106 and transverse frame members 107.
  • the sieve screen 101 is formed of a large number of horizontal wedge bars connected to an array of backing bars 110.
  • the screen 101 is bolted at its upper end to an upper transverse frame member 107 while at its lower end the screen is connected to a lower transverse frame member 107 through rubber bushes 108.
  • the sieve screen 101 is formed on either side with a flexible side wall 109 which is cast in-situ on the sieve screen 101 from a flexible polyurethane resin. These side walls serve to prevent material being passed across the sieve
  • a vibration bar 111 is connected to the. backing bars 11O across the full width of the sieve screen 101.
  • a plurality of U-shaped saddles 112 are connected to the rear surface of the vibration bar 111.
  • Each saddle 112 is pivotally connected to the face end of one of a plurality of fingers 113 which are welded to extend radially from a rod 114.
  • the rod 113 extends transversely across the sieve screen deck 100 and is supported at either end by a bearing 115 such that it may rotationally oscillate about its longitudinal axis.
  • a further arm 116 extends radially from rod 115 and at its free end has a bush which surrounds an eccentric cam (not shown) driven by motor 117 which is mounted on frame 102.
  • a slurry or like feedstock is fed into the distribution bar 104 through inlet 105 and flows evenly onto sieve screen 101.
  • the sceeen 101 is caused to vibrate due to the motor driven eccentric causing the rod 114 to rotationally oscillate which in turn causes the vibration bar 111 to vibrate.
  • the sieve screen deck 100 has been found to be substantially less susceptible to blinding than any of the conventional sieve screen decks described in the preamble to this specification.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)

Abstract

Surface criblante (100), dont le crible (101) comporte une pluralité d'étroites fentes essentiellement parallèles, formées de préférence d'un réseau parallèle de fils métalliques horizontaux reliés à un réseau de barres de support (110) s'étendant longitudinalement par rapport au crible et parallèlement à sa ligne de chute. Le crible (101) est relié aux éléments de cadre (107) à ses deux extrémités, dont au moins une extrémité est reliée à un mécanisme résilient (108) de telle façon que le crible (101) peut vibrer et fléchir sous l'influence d'un mécanisme d'ébranlage ou de vibration (103). Des parois latérales (109) sont prévues le long des côtés du crible (101) afin d'empêcher l'écoulement du matériau au-dessus des côtés du crible, les parois latérales (109) étant à base d'un matériau résilient afin de ne pratiquement pas réduire l'aptitude du crible (101) à vibrer et à fléchir sous l'influence du mécanisme d'ébranlage ou de vibration (103).
EP19830901322 1983-05-13 1983-05-13 Surface criblante. Withdrawn EP0148814A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/AU1983/000062 WO1984004474A1 (fr) 1983-05-13 1983-05-13 Surface criblante

Publications (2)

Publication Number Publication Date
EP0148814A1 true EP0148814A1 (fr) 1985-07-24
EP0148814A4 EP0148814A4 (fr) 1986-05-14

Family

ID=3761140

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830901322 Withdrawn EP0148814A4 (fr) 1983-05-13 1983-05-13 Surface criblante.

Country Status (4)

Country Link
EP (1) EP0148814A4 (fr)
JP (1) JPS60501245A (fr)
NO (1) NO850116L (fr)
WO (1) WO1984004474A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006007114A (ja) * 2004-06-25 2006-01-12 Inoac Corp スクリーンフィルタ
CN115971040B (zh) * 2022-12-16 2023-08-04 河北地质大学 一种自动筛制样品的装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124530A (en) * 1964-03-10 Filter
US3483974A (en) * 1968-02-09 1969-12-16 Universal Oil Prod Co Bar type screening unit with resilient edge sealing means
EP0125794A2 (fr) * 1983-04-13 1984-11-21 Minpro Pty. Limited Tamis soumis à deux mouvements vibratoires

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1565883A (en) * 1923-05-25 1925-12-15 Alfred L Adrianson Screen
DE1172101B (de) * 1961-11-21 1964-06-11 Eduard Uez Ruettelsiebeinrichtung fuer Baumaschinen
SU431710A1 (en) * 1972-02-21 1979-07-25 G Pk Exi Obogatitel Oboru Inertia screen
US3835999A (en) * 1972-10-18 1974-09-17 Bauer Bros Co Screen units used for dewatering and classifying the contents of a liquid slurry

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124530A (en) * 1964-03-10 Filter
US3483974A (en) * 1968-02-09 1969-12-16 Universal Oil Prod Co Bar type screening unit with resilient edge sealing means
EP0125794A2 (fr) * 1983-04-13 1984-11-21 Minpro Pty. Limited Tamis soumis à deux mouvements vibratoires

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO8404474A1 *

Also Published As

Publication number Publication date
EP0148814A4 (fr) 1986-05-14
WO1984004474A1 (fr) 1984-11-22
NO850116L (no) 1985-01-10
JPS60501245A (ja) 1985-08-08

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19850513

AK Designated contracting states

Designated state(s): CH DE FR GB LI NL SE

A4 Supplementary search report drawn up and despatched

Effective date: 19860514

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19860707

RIN1 Information on inventor provided before grant (corrected)

Inventor name: LEES, JEREMY, JAMES