EP1615727A1 - Method for screening soil and a screening device - Google Patents

Method for screening soil and a screening device

Info

Publication number
EP1615727A1
EP1615727A1 EP04726528A EP04726528A EP1615727A1 EP 1615727 A1 EP1615727 A1 EP 1615727A1 EP 04726528 A EP04726528 A EP 04726528A EP 04726528 A EP04726528 A EP 04726528A EP 1615727 A1 EP1615727 A1 EP 1615727A1
Authority
EP
European Patent Office
Prior art keywords
soil
screening device
scoop
screening
shafts
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.)
Granted
Application number
EP04726528A
Other languages
German (de)
French (fr)
Other versions
EP1615727B1 (en
Inventor
Paavo Vasara
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.)
Yhteisviejat Tamex Oy
Original Assignee
Yhteisviejat Tamex Oy
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 Yhteisviejat Tamex Oy filed Critical Yhteisviejat Tamex Oy
Publication of EP1615727A1 publication Critical patent/EP1615727A1/en
Application granted granted Critical
Publication of EP1615727B1 publication Critical patent/EP1615727B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
    • E02F3/92—Digging elements, e.g. suction heads
    • E02F3/9256—Active suction heads; Suction heads with cutting elements, i.e. the cutting elements are mounted within the housing of the suction head
    • E02F3/9268—Active suction heads; Suction heads with cutting elements, i.e. the cutting elements are mounted within the housing of the suction head with rotating cutting elements
    • E02F3/9281—Active suction heads; Suction heads with cutting elements, i.e. the cutting elements are mounted within the housing of the suction head with rotating cutting elements with axis of rotation in horizontal and transverse direction of the suction pipe
    • 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
    • B07B1/14—Roller screens
    • B07B1/15—Roller screens using corrugated, grooved or ribbed rollers
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/40—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets
    • E02F3/407—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets with ejecting or other unloading device
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F7/00—Equipment for conveying or separating excavated material
    • E02F7/06—Delivery chutes or screening plants or mixing plants mounted on dredgers or excavators

Definitions

  • the invention relates to a screening device and a method for screening of soil removed from the ground and transporting it off the site by means of a scoop or a similar soil- processing device and in which method screening is carried out by means of a screening device connected to the scoop and soil removed with the scoop under the water surface by means of the scoop motion, whereby soil and water are moved towards the screening device, essentially deviating from the horizontal and most suitably located in an essentially tilted or vertical direction, and through it into the scoop and the soil gained into the scoop is sucked by means of a pump and removed into an outlet tube.
  • a horizontal screening device comprises several shafts rotatable side by side and furnished with discs. The distance between shafts and the size of discs are so chosen that the discs are partly overlapping each other. The soil to be screened is lifted onto to the screening table and the soil material that has penetrated the screen is transported away from the screen underside.
  • a screen coop in the bottom plate of which there is in the rear part an opening, into which shafts rotatable side by side are placed and shafts are furnished with discs. Soil is taken into the scoop, the scoop is lifted up and rotation of shafts started. The soil that has penetrated the screen falls from scoop, while not penetrated soil remains in it. On screening the scoop is kept for instance over the platform of a lorry. The soil that has not penetrated the screen is emptied elsewhere tilting the scoop.
  • the screening method and device according publication 94729 is intended for screening of soil transported in different ways to the screening device and lifted onto the screen table, whereby screening takes place by means of gravitation through the horizontal screen table. Soil that has not penetrated the screen must be removed from the screen table every now and then.
  • a screening method and screening device according to utility model 1803 connected to a working machine can itself take soil, the working machine must then be driven to the screening site, where screening takes place in the working machine scoop by means of gravitation a scoopfiil at a time.
  • the method according to the invention is characterized in that screening is carried out by rotating the shafts of the screening device, which is formed of several shafts side by side and of discs fixed to them at a distance from each other, while at the same time by means of the said pump soil and water is sucked through said screening device.
  • the screening device in accordance with the invention is characterized in that the screening device is formed of several rotatable shafts side by side and of discs fixed to them overlapping each other and at a distance from and in respect to each other.
  • the advantage of the invention is that especially by removing soil on dredging the watercourses it is possible to keep the scoop connected to the working machine all the time or at least mainly in the bottom,, to move it in bottom direction during working and at the same time to screen bottom soil and remove screened soil from the bottom without lifting up the scoop.
  • the layers are often of a sediment one wants to get mixed in the water as little as possible during dredging. In some cases the sediments even contain poisons.
  • the important advantage is that the dredging scoop can be in slow motion during working in the bottom, and also when sucking water by pump into the scoop, the removed soil and water moves through the screen to the pump and to the outlet tube without the bottom soil getting hardly mixed at all in the water of the watercourse.
  • the screen separates soil, which cannot be let to the pump and the outlet tube. Separation takes place during working without lifting up the scoop apparatus from bottom.
  • the screening device When the screening device is in a position deviating from the horizontal, it can while working with the scoop, carry out screening.
  • the screen device can clean itself and the construction is so made that the screening device rejects pieces, which cannot penetrate the screen.
  • suction dredging blocks often are formed in the grating in front of the screen by plastic bags, ends of boards, scrap metal etc. and clearing the screen of them means interruptions in work. Blocks appear especially on dredging of rivers, city canals and harbours. In the invention the screening device clears itself and thus interruptions due to blocks are minimized.
  • Fig. 1 is the scoop and the screening device according to the invention in working position .
  • Fig. 2 is the scoop with the screening device in it viewed from the front
  • Fig. 3 is the scoop and the screening device in profile.
  • Figure 1 shows bottom dredging of a watercourse by scoop equipment 1 connected, for > instance, to arm 2 of a dredge floating on the surface. Further, the scoop equipment can be turned with respect to arm 2 by means of cylinder 6.
  • the scoop apparatus comprises a pump 4 and for it a motor 5 and also an outlet tube 3.
  • Scoop equipment 1 is open only from its front edge, whereby soil gets into the scoop, when the scoop is moved on the bottom at a certain depth. Pump 4 sucks through the same open portion water and soil into the scoop. Working causes very little mixing of the soil in the surrounding water. Scoop apparatus 1 needs not to be lifted up in between. Its transfers to new motion are also done under water close to the bottom. Greater objects do not remain in the scoop, but the more or less vertical assembly of the screening device rejects greater pieces and moves them away either sidewards or upwards.
  • FIG. 2 shows the location of screening device in the scoop.
  • the screening device has shafts 9 and discs 12 fitted to them. Furthermore, discs 12 are partly overlapping. Shafts 9 are rotated in the same direction by means of a rotating means inside box 7 and a driving motor 15. There are in the upper and lower part additional ribs 10. Shafts 9 can be fitted horizontally or vertically. Vertically assembled screening device rejects bigger pieces better sidewards.
  • discs 12 of the screening device are visible as a section view, in this case the vertical assembly.
  • the screening device can even be tilted, especially backward, with other words, the upper part backward towards pump 4.
  • high pressure water jets can be fitted for screening device cleaning and also if there is hard clay in the bottom.
  • hard clods of clay in front of the screening device can be crushed, which otherwise would not penetrate the screen. Also between the discs clay may get stuck and rotate so that the penetration power of the screen deteriorates.
  • the water jet scan also be directed to clean the screen.
  • the water jet nozzle parts are protected by projecting parts 8.
  • Nozzle tubes 13 run from distributor pipe 16 and are turn towards the screening device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Crushing And Grinding (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

The shafts of a screening device are rotated to drive a scoop equipment (1) such that the scoop equipment scoops soil from under the water. A pump (4) sucks soil and water from the scoop equipment into an outlet tube (3). An independent claim is also included for a screening device.

Description

METHOD FOR SCREENING SOIL AND A SCREENING DEVICE
The invention relates to a screening device and a method for screening of soil removed from the ground and transporting it off the site by means of a scoop or a similar soil- processing device and in which method screening is carried out by means of a screening device connected to the scoop and soil removed with the scoop under the water surface by means of the scoop motion, whereby soil and water are moved towards the screening device, essentially deviating from the horizontal and most suitably located in an essentially tilted or vertical direction, and through it into the scoop and the soil gained into the scoop is sucked by means of a pump and removed into an outlet tube.
Previously known is, among other things a, screening device as above described from Finnish patent publication 94729, where a horizontal screening device comprises several shafts rotatable side by side and furnished with discs. The distance between shafts and the size of discs are so chosen that the discs are partly overlapping each other. The soil to be screened is lifted onto to the screening table and the soil material that has penetrated the screen is transported away from the screen underside.
Further, from the Finnish utility model registration 1803 a screen coop is known, in the bottom plate of which there is in the rear part an opening, into which shafts rotatable side by side are placed and shafts are furnished with discs. Soil is taken into the scoop, the scoop is lifted up and rotation of shafts started. The soil that has penetrated the screen falls from scoop, while not penetrated soil remains in it. On screening the scoop is kept for instance over the platform of a lorry. The soil that has not penetrated the screen is emptied elsewhere tilting the scoop.
The screening method and device according publication 94729 is intended for screening of soil transported in different ways to the screening device and lifted onto the screen table, whereby screening takes place by means of gravitation through the horizontal screen table. Soil that has not penetrated the screen must be removed from the screen table every now and then.
A screening method and screening device according to utility model 1803 connected to a working machine can itself take soil, the working machine must then be driven to the screening site, where screening takes place in the working machine scoop by means of gravitation a scoopfiil at a time.
The disadvantage of above presented methods is their limited scope of screening by gravitation, whereby the screen table or a similar screening shaft assembly must be horizontal, because of which, among other things, by means of a scoop screen according to utility model 1803 screening may be started only when the scoop has been lifted up and kept there in place, in order to take the screened outcome in safe-keeping. Screening is not possible at the same time soil is taken with the scoop from the ground.
In the solution or publication FI-94729 separate machines are needed to gain and to move soil over to the screen table.
However, it is by means of above described methods and equipment not possible to carry out processing and screening of underwater soil and to transport screened material. Therefore, a new method and screening device were developed, by means of which screening can be carried out surprisingly at once under water on the bottom, at same time soil is being loosened off. The method according to the invention is characterized in that screening is carried out by rotating the shafts of the screening device, which is formed of several shafts side by side and of discs fixed to them at a distance from each other, while at the same time by means of the said pump soil and water is sucked through said screening device.
The screening device in accordance with the invention is characterized in that the screening device is formed of several rotatable shafts side by side and of discs fixed to them overlapping each other and at a distance from and in respect to each other.
The advantage of the invention is that especially by removing soil on dredging the watercourses it is possible to keep the scoop connected to the working machine all the time or at least mainly in the bottom,, to move it in bottom direction during working and at the same time to screen bottom soil and remove screened soil from the bottom without lifting up the scoop. On dredging the watercourse bottom, that is removing layers from it, the layers are often of a sediment one wants to get mixed in the water as little as possible during dredging. In some cases the sediments even contain poisons. The important advantage is that the dredging scoop can be in slow motion during working in the bottom, and also when sucking water by pump into the scoop, the removed soil and water moves through the screen to the pump and to the outlet tube without the bottom soil getting hardly mixed at all in the water of the watercourse. The screen separates soil, which cannot be let to the pump and the outlet tube. Separation takes place during working without lifting up the scoop apparatus from bottom. When the screening device is in a position deviating from the horizontal, it can while working with the scoop, carry out screening. The screen device can clean itself and the construction is so made that the screening device rejects pieces, which cannot penetrate the screen.
By known suction dredging blocks often are formed in the grating in front of the screen by plastic bags, ends of boards, scrap metal etc. and clearing the screen of them means interruptions in work. Blocks appear especially on dredging of rivers, city canals and harbours. In the invention the screening device clears itself and thus interruptions due to blocks are minimized.
In the following the invention is disclosed with reference to the enclosed drawing, where Fig. 1 is the scoop and the screening device according to the invention in working position . Fig. 2 is the scoop with the screening device in it viewed from the front Fig. 3 is the scoop and the screening device in profile.
Figure 1 shows bottom dredging of a watercourse by scoop equipment 1 connected, for > instance, to arm 2 of a dredge floating on the surface. Further, the scoop equipment can be turned with respect to arm 2 by means of cylinder 6. The scoop apparatus comprises a pump 4 and for it a motor 5 and also an outlet tube 3. Scoop equipment 1 is open only from its front edge, whereby soil gets into the scoop, when the scoop is moved on the bottom at a certain depth. Pump 4 sucks through the same open portion water and soil into the scoop. Working causes very little mixing of the soil in the surrounding water. Scoop apparatus 1 needs not to be lifted up in between. Its transfers to new motion are also done under water close to the bottom. Greater objects do not remain in the scoop, but the more or less vertical assembly of the screening device rejects greater pieces and moves them away either sidewards or upwards.
Figure 2 shows the location of screening device in the scoop. The screening device has shafts 9 and discs 12 fitted to them. Furthermore, discs 12 are partly overlapping. Shafts 9 are rotated in the same direction by means of a rotating means inside box 7 and a driving motor 15. There are in the upper and lower part additional ribs 10. Shafts 9 can be fitted horizontally or vertically. Vertically assembled screening device rejects bigger pieces better sidewards.
In figure 3 discs 12 of the screening device are visible as a section view, in this case the vertical assembly. The screening device can even be tilted, especially backward, with other words, the upper part backward towards pump 4.
In addition, high pressure water jets can be fitted for screening device cleaning and also if there is hard clay in the bottom. By means of water jets, among other things, hard clods of clay in front of the screening device can be crushed, which otherwise would not penetrate the screen. Also between the discs clay may get stuck and rotate so that the penetration power of the screen deteriorates. The water jet scan also be directed to clean the screen. In the figure the water jet nozzle parts are protected by projecting parts 8. Nozzle tubes 13 run from distributor pipe 16 and are turn towards the screening device.

Claims

1. A method for screening of soil removed from the ground and for transporting it off the site by means of a scoop (1) or a similar soil-processing device, in which method screening is carried out by means of a screening device (9, 12) connected to the scoop and soil is removed with the scoop under water by means of the scoop motion, whereby soil and water get moved towards the screening device (9, 12), essentially deviating from the horizontal and most suitably located in an essentially tilted or vertical direction, and through it into scoop (1), and the soil gained into the scoop is sucked by means of a pump (4) and removed into outlet tube (3), characterized in that screening is carried out by rotating the shafts of the screening device formed of several shafts (9) side by side and of discs (12) fixed to them at a distance from each other, while at the same time by means of the pump (4) soil and water is sucked through said screening device.
2. A method according to claim 1 characterized in that shafts (9) are rotated in the same direction.
3. A method according to claim 1 characterized in that in order to intensify the scattering of soil the water jet taken to the screening device is directed to the soil in the screening device (9, 12) or outside it.
4. Screening device (9, 12) connected to scoop (1) or a similar movable device removing soil and assembled to work in a position essentially deviating from the horizontal most suitably tilted or vertical and for transportation of soil under water through the screening device, connected to the scoop a pump (4) there is for sucking soil and water through screening device (9, 12) and removing into outlet tube (3), characterized in that the screening device comprises several rotatable shafts (9) side by side and interlocked discs (12) fitted to them with a distance from each other and in respect to each other.
5. Screening device according to claim 4 characterized in that shafts (9) are horizontal.
6. Screening device according to claim 4 characterized in that shafts (9) are vertical or vertical and tilted backward from their upper side.
7. Screening device according to claim 4 characterized in that the periphery of the disc (12) located on a shaft (9) is wave-like.
EP04726528A 2003-04-09 2004-04-08 Method for screening soil and a screening device Expired - Lifetime EP1615727B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20030530A FI113846B (en) 2003-04-09 2003-04-09 Soil screening method for dredging rivers, city canals and harbors, involves scooping soil with scoop equipment and sucking soil and water from scoop equipment into outlet tube
PCT/FI2004/000218 WO2004089557A1 (en) 2003-04-09 2004-04-08 Method for screening soil and a screening device

Publications (2)

Publication Number Publication Date
EP1615727A1 true EP1615727A1 (en) 2006-01-18
EP1615727B1 EP1615727B1 (en) 2010-03-24

Family

ID=8565938

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04726528A Expired - Lifetime EP1615727B1 (en) 2003-04-09 2004-04-08 Method for screening soil and a screening device

Country Status (5)

Country Link
EP (1) EP1615727B1 (en)
AT (1) ATE461757T1 (en)
DE (1) DE602004026168D1 (en)
FI (1) FI113846B (en)
WO (1) WO2004089557A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007132065A1 (en) 2006-05-15 2007-11-22 Ramtec Oy Screen scoop and power transmission module for screen scoop

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2005081C2 (en) * 2010-07-14 2012-01-17 Damen Dredging Equipment B V CUTTING HEAD.
JP5181110B1 (en) * 2011-08-17 2013-04-10 独立行政法人農業・食品産業技術総合研究機構 Removal method of contaminated soil surface
ITTO20120162A1 (en) * 2012-02-24 2013-08-25 Cangini Benne Srl SCREENING BUCKET
PT2877640T (en) 2012-07-27 2018-12-18 Nautilus Minerals Pacific Pty A self cleaning collection apparatus and method
CN102995686B (en) * 2012-12-06 2014-08-20 哈尔滨工程大学 Pool dredging system
JP6423825B2 (en) * 2016-07-07 2018-11-14 株式会社伊藤商会 Sieve structure
CN109899069A (en) * 2019-03-11 2019-06-18 李成份 A kind of coal mining equipment

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI81864C (en) * 1986-03-17 1993-01-13 Laennen Tehtaat Oy SUGMUDDRINGSANORDNING
DE9116810U1 (en) * 1991-02-18 1993-12-16 Wack, Helmut, 66440 Blieskastel Bucket for earthmoving equipment
FI94729C (en) * 1993-10-22 1995-10-25 Humuspehtoori Oy Method and apparatus for screening soil mass
JP2660664B2 (en) * 1994-07-11 1997-10-08 新キャタピラー三菱株式会社 Excavation sieve sorting equipment for self-propelled vehicles for work
JP2003045579A (en) * 2001-07-30 2003-02-14 Sumitomo Wiring Syst Ltd Modular plug

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004089557A1 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007132065A1 (en) 2006-05-15 2007-11-22 Ramtec Oy Screen scoop and power transmission module for screen scoop
EP2018457A1 (en) * 2006-05-15 2009-01-28 Ramtec Oy Screen scoop and power transmission module for screen scoop
EP2018457A4 (en) * 2006-05-15 2014-01-08 Ramtec Oy Screen scoop and power transmission module for screen scoop

Also Published As

Publication number Publication date
FI20030530A0 (en) 2003-04-09
WO2004089557A1 (en) 2004-10-21
EP1615727B1 (en) 2010-03-24
DE602004026168D1 (en) 2010-05-06
FI113846B (en) 2004-06-30
ATE461757T1 (en) 2010-04-15

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