EP0051180A2 - Fond de tamis - Google Patents

Fond de tamis Download PDF

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Publication number
EP0051180A2
EP0051180A2 EP81108351A EP81108351A EP0051180A2 EP 0051180 A2 EP0051180 A2 EP 0051180A2 EP 81108351 A EP81108351 A EP 81108351A EP 81108351 A EP81108351 A EP 81108351A EP 0051180 A2 EP0051180 A2 EP 0051180A2
Authority
EP
European Patent Office
Prior art keywords
sieve
plane
openings
webs
slit
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Withdrawn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
EP81108351A
Other languages
German (de)
English (en)
Other versions
EP0051180A3 (fr
Inventor
Gerhard Schmidt
Wolfgang Lehmann
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.)
Hein Lehmann AG
Original Assignee
Hein Lehmann AG
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 Hein Lehmann AG filed Critical Hein Lehmann AG
Publication of EP0051180A2 publication Critical patent/EP0051180A2/fr
Publication of EP0051180A3 publication Critical patent/EP0051180A3/fr
Withdrawn legal-status Critical Current

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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
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • B07B1/4618—Manufacturing of screening surfaces

Definitions

  • the invention relates to a sieve tray with prefabricated individual segments made of elastic material, with gap-shaped sieve openings and crossbars.
  • a sieve tray of this type is often used for dewatering material to be sieved, e.g. B. used in fine coal screening.
  • the aim is to provide the sieve bottom with the largest possible open sieve area.
  • the width of the slit-shaped sieve opening is specified, only the length of the slits can be varied, i.e., as long as possible.
  • the length of the screen openings limiting longitudinal ridges but the danger of deformation of the gap and essential because of the sieving S rises paltgenaumaschine can not be kept longer.
  • such a sieve tray is easily blocked by plug-in grain.
  • the object of the invention is to improve a sieve tray of the type mentioned in such a way that it has sieve openings of high gap accuracy and dimensional stability in a large flat sieve top (sieve plane) free of elevations and, moreover, does not clog. Furthermore, it is an object of the invention to provide a sieve plate of high stability which is inexpensive to manufacture.
  • the columns need only be interrupted at the edge and, if necessary, once more in the middle of the individual segments.
  • the sieve bottom usually has a large number of prefabricated individual segments which are connected to one another by casting.
  • a pourable plastic is suitable for this, e.g. Polyurethane.
  • the individual segments are manufactured, for example, as injection molded parts.
  • the screenings placed on the screen floor no longer slide over the screen level without being dewatered sufficiently. Rather, the water contained in the screenings can flow off well through the gaps, the lengths of which are more than doubled.
  • the crosspieces can have comparatively small distances without thereby adversely reducing the open screen area, the gap accuracy and dimensional stability of the gap-shaped screen openings reaching a high level. The clogging tendency of the sieve bottom is therefore significantly reduced.
  • the largest possible open screen area without loss of gap accuracy can be achieved if at least every second, preferably at least two out of three crossbars end below the screen level. For example, in the case of a square single segment with an edge length of approximately 122 mm, six of a total of nine transverse webs could be moved according to the invention, thereby creating gaps with a length of approximately 53 mm.
  • the water extracted from the material to be screened can then drain off particularly freely if the transverse webs in question end at least 1 mm, preferably at least 3 mm below the screen level.
  • the corresponding individual segments can be manufactured using the injection molding process.
  • the associated molded parts for generating the gap-shaped sieve openings that pass through in the area of the sieve plane can be pulled off parallel to the sieve plane and in the direction of the longitudinal extent of the sieve openings. This allows a continuous conicity of the sieve openings, widening downwards from the sieve level.
  • the demolding process can be further facilitated by the fact that the screen openings also have a small conicity in the screen plane. In such a single segment, eight out of nine crossbars end below the sieve level.
  • the sieve bottom consists of a larger number of individual segments 2.
  • the spaced apart, ready-to-install pre-fabricated individual segments 2 are made by casting with a castable plastic, e.g. Polyurethane, bonded together.
  • the webs 3 given thereby can contain reinforcements and / or can be provided with fastening elements or be prepared for them.
  • the tops of the individual segments 2 and the webs 3 lie in a common sieve plane.
  • the individual segments have slit-shaped sieve openings 4 which are delimited by longitudinal webs 5, 6 and 7 and by transverse webs 8, 9, 10 and 11. In the area of the sieve level, the sieve openings run continuously over about half of a single segment.
  • a sieve tray according to the invention consists of rubber-elastic material.
  • An injection-moldable plastic for example a suitable one, is used for the individual segments Polyurethane, and a castable plastic, for example a polyurethane composed of two components, is used for the webs connecting the individual segments.
  • the individual segments are prefabricated ready for installation before the webs are cast, eg manufactured using the injection molding process.
  • the injection molding process is particularly suitable here, since the individual segment is manufactured in a two-part mold.
  • the individual segments are made square with an edge length of 122 mm.
  • Dimensions for example, much larger or smaller, possible.
  • the width of the slit-shaped sieve openings is narrow, for example 1.5 mm and less, in particular for drainage purposes.
  • the width of the longitudinal webs can, due to the additional support provided by the transverse webs not reaching to the sieve level, be made comparatively narrow despite the rubber-elastic material. As a result, the open screen area can be increased without sacrificing gap accuracy. ;
  • a sieve tray according to the invention is suitable for dewatering material with a high water content, e.g. Fine coal or sand. Because the water contained in the screenings no longer glides across the screen level due to the large open screen area, but can flow off unhindered. The enlargement of the open screen area can be achieved without loss of splitting accuracy and dimensional stability of the individual segments.
  • a high water content e.g. Fine coal or sand.
  • FIGS. 2 and 3 each show an enlarged section along lines II-II and III-III of the sieve plate shown in FIG. 1.
  • the individual segments 2 have marginal longitudinal webs 5 and transverse webs 8 which are extended downwards.
  • Another longitudinal web 7 and a transverse web 9 arranged in the middle of the individual segment 2 are also extended downwards. All longitudinal and transverse webs extended downwards are flush on their undersides.
  • six crosspieces 10, 11 do not extend to the screen plane 12, but end approximately 4 mm below it.
  • the middle crossbar 11 is also extended downwards from three successive crossbars that are not pulled through to the full height and is flush with the longitudinal and crossbars at the edges.
  • the elongated transverse webs 11 have a greater width than the transverse webs 10.
  • the undersides of the lower transverse and longitudinal webs not extended downward lie in a common plane 13.
  • the lower longitudinal webs 6 are approximately half as high as the elongated longitudinal webs 5.
  • the cross section All longitudinal and transverse webs, in particular also that of the lower transverse webs 10, are selected so that a sieve passage widening downward from the sieve plane is ensured.
  • the longitudinal and transverse webs intersect at right angles.
  • the longitudinal axes of the slit-shaped sieve openings can lie transversely or longitudinally to the sieve transport direction in a ready-to-use sieve bottom. In applications where sieve must be dewatered well with a particularly high water content, it is advisable to install the sieve bottom in such a way that the longitudinal axes of the sieve openings run in the sieve transport direction.
  • FIG. 4 shows a partial plan view of a further sieve tray 1 according to the invention, the individual segments 2 of which have sieve openings 4 which run completely through in the region of the sieve plane 12 except for one of the edge transverse webs 8. Otherwise, this sieve tray corresponds to that shown in FIGS. 1 to 3. Only the middle crossbars 15 and one of the two edge crossbars 14 of each individual segment also end below the sieve level. When the webs 3 are cast, separate sealing measures must be taken in the connection area of the perforated transverse webs 14 to prevent the liquid plastic from penetrating into the sieve openings. The substantial enlargement of the open screen area compensated for this disadvantage. In addition, this results in both advantages in the geometric design of the screen openings and also relief, in particular in the demolding of injection-molded individual segments.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Road Paving Structures (AREA)
EP81108351A 1980-11-03 1981-10-15 Fond de tamis Withdrawn EP0051180A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3041338 1980-11-03
DE19803041338 DE3041338A1 (de) 1980-11-03 1980-11-03 Siebboden

Publications (2)

Publication Number Publication Date
EP0051180A2 true EP0051180A2 (fr) 1982-05-12
EP0051180A3 EP0051180A3 (fr) 1983-07-06

Family

ID=6115824

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81108351A Withdrawn EP0051180A3 (fr) 1980-11-03 1981-10-15 Fond de tamis

Country Status (3)

Country Link
EP (1) EP0051180A3 (fr)
DE (1) DE3041338A1 (fr)
ES (1) ES269693Y (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2007200082B2 (en) * 2006-01-13 2010-09-30 Flsmidth A/S A screening module
US8113357B2 (en) * 2006-01-13 2012-02-14 Ludowici Australia Pty. Ltd. Screening module
EP2560769A4 (fr) * 2010-04-19 2014-02-12 Derrick Corp Tamis vibrant en polyuréthane
CN105127092A (zh) * 2015-09-15 2015-12-09 中国矿业大学 一种标准轨座式弹性杆筛板

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3207581A1 (de) * 1982-03-03 1983-09-15 Hein, Lehmann AG, 4000 Düsseldorf Plattenfoermiges siebelement
DE29805984U1 (de) * 1998-04-01 1998-07-02 A.S. Apparatebau GmbH, 83607 Holzkirchen Siebboden

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1255463B (de) * 1966-04-15 1967-11-30 Skelleftea Gummifabriks A B Siebelement
DE2634934C3 (de) * 1976-08-04 1979-06-28 Hein, Lehmann Ag, 4000 Duesseldorf Plattenartiges Siebelement

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2007200082B2 (en) * 2006-01-13 2010-09-30 Flsmidth A/S A screening module
US8113357B2 (en) * 2006-01-13 2012-02-14 Ludowici Australia Pty. Ltd. Screening module
EP2560769A4 (fr) * 2010-04-19 2014-02-12 Derrick Corp Tamis vibrant en polyuréthane
EP3108971A3 (fr) * 2010-04-19 2017-07-19 Derrick Corporation Écran vibratoire de polyuréthane
CN105127092A (zh) * 2015-09-15 2015-12-09 中国矿业大学 一种标准轨座式弹性杆筛板

Also Published As

Publication number Publication date
DE3041338A1 (de) 1982-05-13
ES269693U (es) 1983-07-01
EP0051180A3 (fr) 1983-07-06
ES269693Y (es) 1984-01-16

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

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Effective date: 19840614

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Inventor name: LEHMANN, WOLFGANG

Inventor name: SCHMIDT, GERHARD