WO2007065503A1 - Screening drum for screening granular material - Google Patents

Screening drum for screening granular material Download PDF

Info

Publication number
WO2007065503A1
WO2007065503A1 PCT/EP2006/010356 EP2006010356W WO2007065503A1 WO 2007065503 A1 WO2007065503 A1 WO 2007065503A1 EP 2006010356 W EP2006010356 W EP 2006010356W WO 2007065503 A1 WO2007065503 A1 WO 2007065503A1
Authority
WO
WIPO (PCT)
Prior art keywords
drum
screening
annular screen
screen sections
mesh width
Prior art date
Application number
PCT/EP2006/010356
Other languages
French (fr)
Inventor
Klaus Thesenfitz
Original Assignee
Lintec Gmbh & Co. Kg
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 Lintec Gmbh & Co. Kg filed Critical Lintec Gmbh & Co. Kg
Publication of WO2007065503A1 publication Critical patent/WO2007065503A1/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING 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
    • B07B1/00Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/18Drum screens
    • B07B1/22Revolving drums
    • B07B1/24Revolving drums with fixed or moving interior agitators
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/05Crushing, pulverising or disintegrating apparatus; Aggregate screening, cleaning, drying or heating apparatus; Dust-collecting arrangements specially adapted therefor

Definitions

  • the present invention provides a screening drum of the type indicated above, which is characterised in that the guiding parts are formed as spirally extending guiding helixes and that the pitches of the guiding helixes are variable over the length of the annular screen section in the transport direction of the material.
  • the pitch can relatively strongly decrease over the length of the annular screen section, if the mesh width is coarse with regard to the granulate size distribution and the screened material contains a high share of fine-grained components.
  • the pitch (P) can also relatively little decrease over the length of an annular screen section, if the mesh width is fine with regard to the granulate size distribution of the screened material and the screened material contains a high share of coarse-grained components.
  • the individual annular screen sections are formed with multiple-threaded guiding helixes.
  • the locally present pitches P of the guiding helixes determine the material flow and the dwell time of a mineral mixture, for example, in a screening zone and sets the material stream.
  • the material stream itself is defined as the mineral amount per time unit and is usually indicated as tons per hour, thus it is a screening performance of a screening drum.
  • the grain composition of a mineral mixture is taken into account above all.
  • the composition itself depends on the formulation of the produced asphalt.
  • the mesh width of the mounted screens is important. As usually several asphalt formulations are produced by one asphalt producing device, the used mesh widths are a compromise obtained from different requirements and they are therefore designed closely to user specifications.
  • the course of the pitch continuously decreases in a screening zone, thus it is declining.
  • the amount of the decrease is expressed by the spiral factor and this is within the range of 0,95 to 0,75%.
  • the spiral factor is large with a high share of coarse-grained material and with a large mesh width and vice versa.
  • the figure shows a longitudinal illustration of a screening drum according to the invention.
  • a drum 2 can be seen, which is rotated around its geometrical axis 3.
  • the material to be screened is charged from the right hand side onto the drum 2 and that via an input device 100 not explained in detail.
  • the mineral mixture passes through openings in the drum 2 into the actual screening area, which is disposed at the circumference of the screening drum.
  • the mineral mixture passes through the individual screening zones I to V.
  • the screening zone I or the corresponding annular screen section, respectively, is arranged closest to the drum 2 and the associated screens are located at a small radial distance from the drum 2.
  • the annular screen section III is located at the distal end with regard to the openings and also has a relatively small radial distance to the drum 2.
  • the annular zone II is located radially further outside with regard to the screening zone I.
  • the screening zone V is located at the distal end (on the right-hand side in the figure) with regard to the openings. This zone is, as opposed to the screening zones I to IV, a screening zone comprising only one screen of a certain relatively large mesh width.
  • the mesh widths can be selected in correspondence with known screening drums, in order to be able to catch screened material in separate silo containers (not shown) in the area below the drum 3 or the screening zone I to V, respectively.
  • Guiding helixes can be seen in the figure, which spirally extent in the circumferential direction of the drum 2 and ensure that the material to be screened is moved, as viewed in the figure, from the left hand side to the right hand side, in order to be finally passed into the individual silo containers.
  • the pitch of the guiding helix 15 is small, whereas the pitch of the guiding helix in the screening zone III is large. The corresponding applies to the screening zone III. If the pitch P further decreases, the number of the guiding helixes must be reduced, as also illustrated in the screening zone III at the right part.
  • the guiding helixes for the screening zones II and IV are not shown across the total circumference, but only in local section illustration. It can be recognised, though, that a graduation of the pitch P is given here as well.
  • the invention relates in general to the screening of material to the screened, and as far as the use in the production of asphalt has been described in the specification given above, this is not to be construed as limiting.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)
  • Combined Means For Separation Of Solids (AREA)

Abstract

The invention relates to a screening drum (2) for screening granular material comprising an input device at the front ends of the lying drum rotating around its longitudinal axis (3) , and an output of the material into a first annular space (8) between the drum (2) and inner annular screen sections consecutively arranged in the longitudinal direction of the drum and concentrically surrounding the drum, and a transfer of the material into radially outer annular screen sections . The mesh width of the annular screen sections is selected such that the section with smaller mesh width is the one axially nearest to the output and the section with the largest mesh width is the annular screen section axially located the furthest away from the output. Guiding parts are provided in the annular screen sections for transporting the material, which are formed as spirally shaped guiding helixes (15, 16) and the pitches (P) of which increase in sections in the transport direction.

Description

respective screens in accordance with the contents of fine and coarse-grained material components.
In this regard the present invention provides a screening drum of the type indicated above, which is characterised in that the guiding parts are formed as spirally extending guiding helixes and that the pitches of the guiding helixes are variable over the length of the annular screen section in the transport direction of the material.
In particular, the pitch can relatively strongly decrease over the length of the annular screen section, if the mesh width is coarse with regard to the granulate size distribution and the screened material contains a high share of fine-grained components.
The pitch (P) can also relatively little decrease over the length of an annular screen section, if the mesh width is fine with regard to the granulate size distribution of the screened material and the screened material contains a high share of coarse-grained components.
In especially preferred embodiments of the screening drum, the individual annular screen sections are formed with multiple-threaded guiding helixes.
The locally present pitches P of the guiding helixes determine the material flow and the dwell time of a mineral mixture, for example, in a screening zone and sets the material stream. The material stream itself is defined as the mineral amount per time unit and is usually indicated as tons per hour, thus it is a screening performance of a screening drum.
In the configuration of the optimum pitch of the guiding helixes of a screening drum, the grain composition of a mineral mixture is taken into account above all. The composition itself depends on the formulation of the produced asphalt. Furthermore, the mesh width of the mounted screens is important. As usually several asphalt formulations are produced by one asphalt producing device, the used mesh widths are a compromise obtained from different requirements and they are therefore designed closely to user specifications.
In the calculation of the optimum pitch in a screening zone both factors must be considered. The grain composition of the mineral mixture in connection with the screen mesh width gives the percentage of material discharge during the passage through the screening zone. In this, the material flow continuously decreases. By this decrease the pitch of the guiding helixes can be reduced in turn, in order to increase the dwell time in the screening zone and improve the screening result thereby.
In a preferred embodiment the course of the pitch continuously decreases in a screening zone, thus it is declining. The amount of the decrease is expressed by the spiral factor and this is within the range of 0,95 to 0,75%. The spiral factor is large with a high share of coarse-grained material and with a large mesh width and vice versa. The invention is explained below by way of example based on the only figure of the drawing.
The figure shows a longitudinal illustration of a screening drum according to the invention.
In the figure, a drum 2 can be seen, which is rotated around its geometrical axis 3. The material to be screened is charged from the right hand side onto the drum 2 and that via an input device 100 not explained in detail. After drying and heating of the minerals inside of the screening drum, the mineral mixture passes through openings in the drum 2 into the actual screening area, which is disposed at the circumference of the screening drum. The mineral mixture passes through the individual screening zones I to V. The screening zone I or the corresponding annular screen section, respectively, is arranged closest to the drum 2 and the associated screens are located at a small radial distance from the drum 2. The annular screen section III is located at the distal end with regard to the openings and also has a relatively small radial distance to the drum 2.
The annular zone II is located radially further outside with regard to the screening zone I. The same applies to the screening zone IV with regard to the screening zone III.
At the distal end (on the right-hand side in the figure) with regard to the openings, the screening zone V is located. This zone is, as opposed to the screening zones I to IV, a screening zone comprising only one screen of a certain relatively large mesh width.
The mesh widths can be selected in correspondence with known screening drums, in order to be able to catch screened material in separate silo containers (not shown) in the area below the drum 3 or the screening zone I to V, respectively.
Guiding helixes can be seen in the figure, which spirally extent in the circumferential direction of the drum 2 and ensure that the material to be screened is moved, as viewed in the figure, from the left hand side to the right hand side, in order to be finally passed into the individual silo containers.
It can be seen that in the screening zone I, for example, the pitch of the guiding helix 15 is small, whereas the pitch of the guiding helix in the screening zone III is large. The corresponding applies to the screening zone III. If the pitch P further decreases, the number of the guiding helixes must be reduced, as also illustrated in the screening zone III at the right part. For the sake of clarity of illustration the guiding helixes for the screening zones II and IV are not shown across the total circumference, but only in local section illustration. It can be recognised, though, that a graduation of the pitch P is given here as well.
The invention relates in general to the screening of material to the screened, and as far as the use in the production of asphalt has been described in the specification given above, this is not to be construed as limiting.

Claims

Claims
1. Screening drum (2) for screening granular material comprising an input device an the front ends of the lying drum rotating around its longitudinal axis (3) , and an output of the material into a first annular space (8) between the drum (2) and inner annular screen sections consecutively arranged in the longitudinal direction of the drum and concentrically surrounding the drum, and a transfer of the material into radially outer annular screen sections, wherein the mesh width of the annular screen sections is selected such that the section with smaller mesh width is the one axially nearest to the output and the section with the largest mesh width is the annular screen section axially located the furthest away from the output (9), and comprising guiding parts in the annular screen sections for transporting the material and having silos arranged at the bottom side of the drum for reception of screened material of different particle sizes, characterised in that the guiding parts are formed as spirally extending guiding helixes (15, 16) , and that the pitches of the guiding helixes of the individual consecutively arranged annular screen sections increase in sections in the transport direction.
2. Screening drum according to claim 1, characterised in that the guiding parts are configured at least in areas as multiple-threaded screws.
PCT/EP2006/010356 2005-12-08 2006-10-27 Screening drum for screening granular material WO2007065503A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005058751.8 2005-12-08
DE102005058751 2005-12-08

Publications (1)

Publication Number Publication Date
WO2007065503A1 true WO2007065503A1 (en) 2007-06-14

Family

ID=37686053

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/010356 WO2007065503A1 (en) 2005-12-08 2006-10-27 Screening drum for screening granular material

Country Status (2)

Country Link
CN (1) CN1978072A (en)
WO (1) WO2007065503A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103286070A (en) * 2013-06-13 2013-09-11 无锡朗特机械设备有限公司 Screw-pitch-variable hole-pitch-variable drum screen separator
CN103286069A (en) * 2013-06-13 2013-09-11 无锡朗特机械设备有限公司 Hole-pitch-variable drum screen separator

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102179372B (en) * 2011-03-23 2013-05-15 程利岳 Fruit classifier
CN102139267B (en) * 2011-03-23 2013-09-18 程利岳 Fruit sorting machine
CN103272774B (en) * 2013-06-13 2015-11-18 无锡朗特机械设备有限公司 Varying pitch trommel separator
CN103433200B (en) * 2013-08-30 2015-06-17 清华大学 Drum-type particle sorting device
CN104841637B (en) * 2015-06-04 2018-05-01 温利春 Cleaning rice machine
CN106140609B (en) * 2016-08-30 2018-06-05 河南威猛振动设备股份有限公司 A kind of intersection rotary screen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2858019A (en) * 1956-11-23 1958-10-28 Harry A Lindahl Grain cleaning and separating apparatus
WO1990006400A1 (en) * 1988-12-07 1990-06-14 Wibau Maschinen Gmbh & Co. Kg Drying and sorting device for granular bulk materials
EP0521361A2 (en) * 1991-06-29 1993-01-07 LINTEC GmbH + Co. KG Sieve drum
WO2005014186A1 (en) * 2003-07-16 2005-02-17 Seko Spa Riddling device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2858019A (en) * 1956-11-23 1958-10-28 Harry A Lindahl Grain cleaning and separating apparatus
WO1990006400A1 (en) * 1988-12-07 1990-06-14 Wibau Maschinen Gmbh & Co. Kg Drying and sorting device for granular bulk materials
EP0521361A2 (en) * 1991-06-29 1993-01-07 LINTEC GmbH + Co. KG Sieve drum
WO2005014186A1 (en) * 2003-07-16 2005-02-17 Seko Spa Riddling device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103286070A (en) * 2013-06-13 2013-09-11 无锡朗特机械设备有限公司 Screw-pitch-variable hole-pitch-variable drum screen separator
CN103286069A (en) * 2013-06-13 2013-09-11 无锡朗特机械设备有限公司 Hole-pitch-variable drum screen separator

Also Published As

Publication number Publication date
CN1978072A (en) 2007-06-13

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