WO1985001456A1 - Method for screening of wooden chips and the like and a screen - Google Patents

Method for screening of wooden chips and the like and a screen Download PDF

Info

Publication number
WO1985001456A1
WO1985001456A1 PCT/SE1984/000248 SE8400248W WO8501456A1 WO 1985001456 A1 WO1985001456 A1 WO 1985001456A1 SE 8400248 W SE8400248 W SE 8400248W WO 8501456 A1 WO8501456 A1 WO 8501456A1
Authority
WO
WIPO (PCT)
Prior art keywords
carriers
screening
chute
frame
rods
Prior art date
Application number
PCT/SE1984/000248
Other languages
French (fr)
Inventor
Svante Lundqvist
Original Assignee
General Production And Planning Ab
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 General Production And Planning Ab filed Critical General Production And Planning Ab
Publication of WO1985001456A1 publication Critical patent/WO1985001456A1/en

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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
    • B07B1/12—Apparatus having only parallel elements
    • 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

Definitions

  • a known screening device includes a chute arranged upon a bottom frame, by which the chute is provided with an upper bottom which includes a screening grid consisting of mutual parallel screening rods, and is brought to vibrate relative to the frame by help of a vibrating device.
  • the bottom frame is provided with longish carriers, which are arranged projecting up between the screening rods so that gaps are obtained between the rods.
  • the screening rods performs a to-and-fro movement relative to the carriers, by which stuff with a piece size less or equal to the width of the gaps are falling through the screening grid and will be picked up on a lower botton arranged on the chute.
  • the purpose with the present invention is to satisfy the wishes mentioned above.
  • the purpose has been achieved by an invention which is constituted by a method for screening with a screening device which partly shows the same members as the known screening device and which is characterized in that the carriers is brought to vibrate partly relative to the bottom frame and partly relative the chute with the screening rods, by which the chute preferably is vibrating in the same plane as the carriers.
  • the relative movement between the screening rods and the carriers is controlled by a mutual phase displacement of these respectively movement of vibration.
  • the invention also includes a screening device which is characterized in that the carriers are movably arranged on the frame.
  • the carriers are connected to the frame by struts, which include a spring device.
  • the vibrating movement of the carriers thereby is effected by a vibration device which is attached to any of the struts.
  • the vibration movement of the chute and the screening rods is effected by a vibration device attached on the frame and which is connected with the chute.
  • the vibration device thereby preferably is constituted by a crank device which is driven by an electrical motor.
  • the carriers and the chute are vibrated by crank devices attached to the frame, whose crank motion is controllable for adjusting of a mutual phase displacement of the two vibration movements.
  • the carriers are provided with a mass, which is considerably less than the one of the chute, by which the carriers easier can be brought to vibrate with a higher frequency than the chute.
  • the screening method in accordance with the invention is not limited to a division of a stuff into two fractions. By providing the chute with several bottoms a division in several fractions can be achieved.
  • the method is in particular active by screening wooden chips, but is not limited to this kind of stuff.
  • the method also can be used e.g. to separate gravel from wooden chips and the like.
  • Figure 1 shows a screen for transporting and screening of wooden chips as seen fron one side.
  • Figure 2 shows the screen in accordance with figure 1 in a cross-section.
  • the screen in accordance with the example includes a chute 1 with an U-formed cross-section, which is carried by a frame 2 by suspension bars 3.
  • the chute 1 is provided with an upper bottom 4 and a lower bottom 5.
  • a screening aperture is arranged in the upper bottom 4 of the chute, which is covered by a screening grid consisting of mutually parallel screening rods 6 made of round iron.
  • the frame 2 futher carries two loop-formed struts 7 whose attachements in the frame 2 consist of plate springs 8 which can be bent in the longitudinal direction of the chute 1.
  • the loop struts 7 are twistable connected mutually by longish carriers 9 made of flat iron which are arranged edgeways so that one carrier 9 projects up between two screening rods 6 so that gaps are obtained between the screening rods 6 and the carriers 9.
  • a vibrator 10 is arranged, which oscillations coincides with the bending plane of the plate springs 8.
  • the chute 1 futher is connected to the frame 2 by a crank vibrator 11, which stroke length and number of revolutions can be adjusted relative to the carrier vibrator 10 which oscillations also is adjustable.
  • the wooden chips which have to be screened is feeded into the chute 1 at the arrow against the upper bottom 4 and is moved by the shaking movement of the chute 1 effected by the crank arm vibrator 11 down to the screening grid where chips having a piece size less than the gap between the screening rods 6 and the carriers 9 is brought to fall through down to the lower bottom 5 in order to be moved on by the shaking movement of the chute 1 and away form it at the arrow from the lower bottom 5.
  • the coarse fraction which pass over the screening grid is moved on by the shaking movement of the chute 1 and out from this one at the arrow from the upper bottom 4.
  • the two fractions are transported ahead separately by help of following conveyors.
  • the chute 1 and the screening rods 6 is controlled relative to the loop struts 7 and the carriers 9 by help of control devices as e.g. guides or other in itself known devices which are not shown in the figures.
  • control devices as e.g. guides or other in itself known devices which are not shown in the figures.
  • the gap between the screening rods 6 and the carriers 9 has a constant width at the relative movement between the screening rods 6 and the carriers 9, which in its turn gives a moore exact limit between the two fractions that are separated in the screen.
  • Such an exact fractionating has not earlier been possible to achieve for instance by help of the known screening device mentioned above, where the carriers are firmly connected to the base of the device and where the chute with the screening grid is not provided with any guide to the base, e.g. indirectly the carriers which projects in the screening grid.
  • Eventually play which arise by wearing of the suspension attachements brings the chute and the screening grid to move also sideways causing a varying width of the gaps between the screening grid and the carriers.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Jigging Conveyors (AREA)

Abstract

A method for screening of wooden chips and the similar stuff placed upon a vibrating conveyor including a chute (1) and a frame (2), at which the bottom (4) of the chute (1) is provided with a screening grid consisting of mutually parallel screening rods (6) and is brought to vibrate relative to the frame (2) by help of a vibrating device (11) and at which the frame (2) is provided with longish carriers (9) which are arranged projecting up between the screening rods (6) and the carriers (9), and at which the carriers (9) is brought to vibrate partly relative to the frame (2) and partly relative to the chute (1) with the screening rods. The chute (1) with the screening rods (6) is vibrating in the same plane as the carriers (9) at which the relative movement between the screening rods (6) and the carriers (9) is controlled by a mutual phase displacement of these respectively movement of vibration. The invention also includes a screen for carrying out the method at which the carriers are movably arranged on the frame (2) and connected to a vibrating device (10).

Description

METHOD FOR SCREENING OF WOODEN CHIPS AND THE LIKE AND A SCREEN
The present invention concerns a method for screening of wooden chips and the similar stuff and a device forming a screen for carrying out the invention. A known screening device includes a chute arranged upon a bottom frame, by which the chute is provided with an upper bottom which includes a screening grid consisting of mutual parallel screening rods, and is brought to vibrate relative to the frame by help of a vibrating device. The bottom frame is provided with longish carriers, which are arranged projecting up between the screening rods so that gaps are obtained between the rods. When the chute is vibrating, e.g. oscillates in a plane in its longitudinal direction, the screening rods performs a to-and-fro movement relative to the carriers, by which stuff with a piece size less or equal to the width of the gaps are falling through the screening grid and will be picked up on a lower botton arranged on the chute.
It has appeared that the known device has a range of application limited to certain kind of stuff and a limited capacity. Thus it is a wish partly to widen the range of application of the device and partly to encrease the capacity inside given limitations.
The purpose with the present invention is to satisfy the wishes mentioned above. The purpose has been achieved by an invention which is constituted by a method for screening with a screening device which partly shows the same members as the known screening device and which is characterized in that the carriers is brought to vibrate partly relative to the bottom frame and partly relative the chute with the screening rods, by which the chute preferably is vibrating in the same plane as the carriers. In particular the relative movement between the screening rods and the carriers is controlled by a mutual phase displacement of these respectively movement of vibration.
The invention also includes a screening device which is characterized in that the carriers are movably arranged on the frame. Preferably the carriers are connected to the frame by struts, which include a spring device. The vibrating movement of the carriers thereby is effected by a vibration device which is attached to any of the struts. The vibration movement of the chute and the screening rods is effected by a vibration device attached on the frame and which is connected with the chute. The vibration device thereby preferably is constituted by a crank device which is driven by an electrical motor.
In an alternative performance of the invention, the carriers and the chute are vibrated by crank devices attached to the frame, whose crank motion is controllable for adjusting of a mutual phase displacement of the two vibration movements.
The carriers are provided with a mass, which is considerably less than the one of the chute, by which the carriers easier can be brought to vibrate with a higher frequency than the chute. By this an intencive movement in the stuff to be screened will be achieved at the gap between the carriers and the screening rods, by which an effective screening will be achieved. The higher frequency of oscillation of the carriers also has proved to prevent clogging of the screening grid.
The screening method in accordance with the invention is not limited to a division of a stuff into two fractions. By providing the chute with several bottoms a division in several fractions can be achieved. The method is in particular active by screening wooden chips, but is not limited to this kind of stuff. The method also can be used e.g. to separate gravel from wooden chips and the like.
The invention is described below in an performance concerning a screen for wooden chips according to accompanying drawings.
Figure 1 shows a screen for transporting and screening of wooden chips as seen fron one side.
Figure 2 shows the screen in accordance with figure 1 in a cross-section.
The screen in accordance with the example includes a chute 1 with an U-formed cross-section, which is carried by a frame 2 by suspension bars 3. The chute 1 is provided with an upper bottom 4 and a lower bottom 5. A screening aperture is arranged in the upper bottom 4 of the chute, which is covered by a screening grid consisting of mutually parallel screening rods 6 made of round iron.
The frame 2 futher carries two loop-formed struts 7 whose attachements in the frame 2 consist of plate springs 8 which can be bent in the longitudinal direction of the chute 1. The loop struts 7 are twistable connected mutually by longish carriers 9 made of flat iron which are arranged edgeways so that one carrier 9 projects up between two screening rods 6 so that gaps are obtained between the screening rods 6 and the carriers 9. At one of the loop struts 7 a vibrator 10 is arranged, which oscillations coincides with the bending plane of the plate springs 8. The chute 1 futher is connected to the frame 2 by a crank vibrator 11, which stroke length and number of revolutions can be adjusted relative to the carrier vibrator 10 which oscillations also is adjustable.
The wooden chips which have to be screened is feeded into the chute 1 at the arrow against the upper bottom 4 and is moved by the shaking movement of the chute 1 effected by the crank arm vibrator 11 down to the screening grid where chips having a piece size less than the gap between the screening rods 6 and the carriers 9 is brought to fall through down to the lower bottom 5 in order to be moved on by the shaking movement of the chute 1 and away form it at the arrow from the lower bottom 5. The coarse fraction which pass over the screening grid is moved on by the shaking movement of the chute 1 and out from this one at the arrow from the upper bottom 4. The two fractions are transported ahead separately by help of following conveyors.
In an alternative performance of the example above, the chute 1 and the screening rods 6 is controlled relative to the loop struts 7 and the carriers 9 by help of control devices as e.g. guides or other in itself known devices which are not shown in the figures. To that one secures that the gap between the screening rods 6 and the carriers 9 has a constant width at the relative movement between the screening rods 6 and the carriers 9, which in its turn gives a moore exact limit between the two fractions that are separated in the screen. Such an exact fractionating has not earlier been possible to achieve for instance by help of the known screening device mentioned above, where the carriers are firmly connected to the base of the device and where the chute with the screening grid is not provided with any guide to the base, e.g. indirectly the carriers which projects in the screening grid. Eventually play which arise by wearing of the suspension attachements brings the chute and the screening grid to move also sideways causing a varying width of the gaps between the screening grid and the carriers.

Claims

PATENT CLAIMS
1. A method for screening of wooden chips and the similar stuff placed upon a vibrating conveyor including a chute (1) and a frame (2), at which the bottom (4) of the chute (1) is provided with a screening grid consisting of mutually parallel screening rods (6) and is brought to vibrate relative to the frame (2) by help of a vibrating device (11) and at which the frame (2) is provided with longish carriers (9) which are arranged projecting up between the screening rods (6) so that gaps arises between the screening rods (6) and the carriers (9), c h a r a c t e r i z e d in that the carriers (9) are brought to vibrate partly relative to the frame (2) and partly relative to the chute (1) with the screening rods (6).
2. A method accordning to claim 1, c h a r a c t e r i z e d in that the chute (1) and with the screening rods (6) is vibrating in the same plane as the carriers (9).
3. A method accordning to claim 1-2, c h a r a c t e r i z e d in that the relative movement between the screening rods (6) and the carriers (9) is controlled by a mutual phase displacement of these respectively movement of vibration.
4. A screen for wooden chips and the similar stuff placed upon a vibrating conveyor including a chute (1) and a frame (2), at wihch the bottom (4) of the chute (1) is provided with a screening grid consisting of mutually parallel screening rods (6) and is brought to vibrate by help of a vibrating device (11) and at which the frame (2) is provided with longish carriers (9) wich are arranged projecting up between the screening rods (6) so that gaps arises between the screening rods (6) and the carriers (9), c ha r a c t e r i z e d in that the carriers (9) are movable arranged on the frame (2) and connected to a vibrating device (10).
5. A screen accordning to claim 4, c h a r a c t e r i z e d in that the carriers (9) are connected to the frame (2) by struts (7) including a vibrating device (8).
6. A screen according to claim 1-4, c h a r a c t e r i z e d in that the screening rods (6) are connected to the carriers (9) by guides of a known kind.
PCT/SE1984/000248 1983-10-06 1984-06-29 Method for screening of wooden chips and the like and a screen WO1985001456A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8305500-4 1983-10-06
SE8305500A SE435687B (en) 1983-10-06 1983-10-06 PROCEDURE FOR SALING TREFLIS AND SIMILAR AND SALL

Publications (1)

Publication Number Publication Date
WO1985001456A1 true WO1985001456A1 (en) 1985-04-11

Family

ID=20352792

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1984/000248 WO1985001456A1 (en) 1983-10-06 1984-06-29 Method for screening of wooden chips and the like and a screen

Country Status (5)

Country Link
US (1) US4664790A (en)
EP (1) EP0188416A1 (en)
AU (1) AU3157184A (en)
SE (1) SE435687B (en)
WO (1) WO1985001456A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993007971A1 (en) * 1991-10-22 1993-04-29 Edem Steel Ltd. Vibrating conveyor screening method and apparatus

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US5117983A (en) * 1989-08-07 1992-06-02 Weyerhaeuser Company Bar screen having a reciprocating action
US5069778A (en) * 1990-11-13 1991-12-03 Rotex, Inc. Screen deck with pedestal mounted slats
GB9320279D0 (en) * 1993-10-01 1993-11-17 Radix Systems Ltd The aligning of elongated objects
US6000554A (en) * 1996-05-13 1999-12-14 Comcorp, Inc. Reciprocating screening conveyor
DE10136109A1 (en) * 2001-07-26 2003-02-13 Schenck Process Gmbh Vibratory conveying apparatus
FR2896238B1 (en) * 2006-01-16 2009-11-06 Cogema SCREENING AND ONLINE NUCLEAR FUEL PELLETS
US9427780B2 (en) 2011-10-26 2016-08-30 Rejean Houle Vibrating slot sieve slurry processing apparatus and method
US8557127B2 (en) 2011-10-26 2013-10-15 Rejean Houle Apparatus and method for removing solid debris from slurry processing system
US8562832B2 (en) 2011-10-26 2013-10-22 Rejean Houle Three-stage slurry processing apparatus and method
CN108126821A (en) * 2018-01-16 2018-06-08 王朝荣 A kind of removable automatic sand sieving device
EP3747556A4 (en) * 2018-01-31 2021-10-27 JX Nippon Mining & Metals Corporation Method for removing wire-form objects, device for removing wire-form objects, and method for processing electronic/electrical apparatus component scrap
CN110583243B (en) * 2019-10-20 2023-04-07 海南大学 Soil-covering type straw crushing and returning machine
EP4368360A1 (en) * 2022-11-07 2024-05-15 Universita' Degli Studi di Firenze Screening device for the production of calibrated wood chips for use in pellet-fuelled boilers and stoves

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US2911097A (en) * 1958-10-20 1959-11-03 Bixby Zimmer Engineering Compa Screen
GB2126129A (en) * 1982-08-10 1984-03-21 Marcus Danielsson Screening device

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US431176A (en) * 1890-07-01 Fruit-grader
US1472439A (en) * 1922-09-08 1923-10-30 Clarence J Sandoe Screening device
US1552397A (en) * 1922-09-23 1925-09-01 Lucy W Edwards Mechanical movement
US1606301A (en) * 1923-09-07 1926-11-09 Inland Engineering Company Screening and feeding apparatus
US1703726A (en) * 1927-12-14 1929-02-26 Clara J Davis Screen
US3023904A (en) * 1954-03-15 1962-03-06 Brueckenbau Flender Gmbh Screen for use in oscillating screening devices
US2870910A (en) * 1954-03-15 1959-01-27 Brueckenbau Flender Gmbh Screen for use in oscillating screening devices
GB1154196A (en) * 1966-07-27 1969-06-04 Albert Wehner Screening Machines
SE435585B (en) * 1983-05-16 1984-10-08 Kmw Mekan Ab screening device
US4558787A (en) * 1983-08-01 1985-12-17 Marcus Danielsson Screening device having a screen deck composed of two screen frames

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2911097A (en) * 1958-10-20 1959-11-03 Bixby Zimmer Engineering Compa Screen
GB2126129A (en) * 1982-08-10 1984-03-21 Marcus Danielsson Screening device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993007971A1 (en) * 1991-10-22 1993-04-29 Edem Steel Ltd. Vibrating conveyor screening method and apparatus
US5368167A (en) * 1991-10-22 1994-11-29 Edem Steel Ltd. Vibrating conveyor screening method and apparatus

Also Published As

Publication number Publication date
EP0188416A1 (en) 1986-07-30
SE435687B (en) 1984-10-15
AU3157184A (en) 1985-04-23
US4664790A (en) 1987-05-12
SE8305500D0 (en) 1983-10-06

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