EP0081471B1 - Système de criblage - Google Patents

Système de criblage Download PDF

Info

Publication number
EP0081471B1
EP0081471B1 EP82850244A EP82850244A EP0081471B1 EP 0081471 B1 EP0081471 B1 EP 0081471B1 EP 82850244 A EP82850244 A EP 82850244A EP 82850244 A EP82850244 A EP 82850244A EP 0081471 B1 EP0081471 B1 EP 0081471B1
Authority
EP
European Patent Office
Prior art keywords
screen
elements
screening
frame
stiffening
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.)
Expired
Application number
EP82850244A
Other languages
German (de)
English (en)
Other versions
EP0081471A1 (fr
Inventor
Bengt Lars Arne Dehlen
Sven Erik Dyrup
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.)
Trelleborg AB
Original Assignee
Trelleborg 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26658032&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0081471(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from SE8201272A external-priority patent/SE428763B/sv
Application filed by Trelleborg AB filed Critical Trelleborg AB
Priority to AT82850244T priority Critical patent/ATE28414T1/de
Publication of EP0081471A1 publication Critical patent/EP0081471A1/fr
Application granted granted Critical
Publication of EP0081471B1 publication Critical patent/EP0081471B1/fr
Expired 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
    • B07B1/4645—Screening surfaces built up of modular 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
    • B07B1/48—Stretching devices for screens
    • 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
    • B07B1/48—Stretching devices for screens
    • B07B1/49—Stretching devices for screens stretching more than one screen or screen section by the same or different stretching means

Definitions

  • the present invention relates to a screen comprising a screen frame with supporting elements for a screen deck inserted in the screen frame, and fastening means for the screen deck.
  • screening machines with small individually fastenable screen elements are not often used since they necessitate reconstruction of existing screening machines.
  • the most commonly used variant of screening machines makes use instead of screen cloths of substantial size, very often 1-2 m 2 per unit.
  • This type of screen cloths are fastened in the screen frames by providing the screen cloth units with hooks by which the screen cloth units are clamped between opposed edges of the screen frame.
  • An example of such a clamping method is disclosed in DE-OS 2,005,376.
  • This fastening method is utilized for the majority of all screening machines which at present are manufactured all over the world, as a result of which the frame constructions of most screening machines are of a similar kind.
  • it has been tried to divide the screen deck into smaller units which are readily exchangeable to facilitate rapid exchange of a worn section and also to afford an opportunity for rapidly shifting from one hole size to another within a section of the screen deck.
  • US-A-2,910,180 relates to a screening device of the type defined in the preamble of claim 1 where use is made of resilient forces in the screening elements to hold them fixed against their supporting elements.
  • the screening elements are not elongated and therefore require a special tool to bend them when locating them in position in the device.
  • FR-A-2,047,758 and US-A-3,833,120 are concerned with the conventional technique where the reinforcing structure is subjected to a pretensioning in the plane of the screen cloth at right angles to the screening direction in order to reduce the vertical vibration of the reinforcing members and, accordingly, to suppress the vertical vibration of the rubber screen.
  • CH-A-495,791 is based on the conventional technique where the screen cloth is subjected to a pretensioning in a plane transverse of the screening direction, and furthermore makes use of magnetic forces to hold the screen cloth down against its supporting structure.
  • a screening system comprising a screen frame with supporting elements for a screen deck inserted in the screen frame and fastening means for the screen deck which comprises several screen elements made from an elastomer and placed adjacent each other and having stiffening elements which are included in the screen elements and which by bending, are prestressed against the supporting elements by elastic deformation, upon mounting in the screen frame, it is required, according to the present invention, that the screen elements are mounted with their longitudinal direction extending transverse to the screen direction and that the length to width ratio of the screen elements is at least 3:1, so that the bending can be effected without the use of a special tool.
  • the invention thus is based on the idea that the separate screen elements forming said screen deck should be formed as elongated and rigid plank-like elements and, upon mounting, be subjected to an elastic deformation in order to provide the required holding-down force against the supporting elements of the screen frame.
  • the present invention makes it much easier to apply the requisite holding-down force against the supporting elements of the screen frame.
  • the screen frame is designed in such a manner that the support elements force the screen elements to curve convexly, the screening elements can be formed with straight stiffening elements.
  • One end of the screen elements is then secured to the frame, and-the screen elements are bent over the supporting elements to be secured underneath a hold-down rib at the opposite side of the screen frame.
  • the force required for bending the screen elements will be considerably less than a force directed in the plane of the screen elements and applied in order to stretch the screen elements to such an extent that the same holding-down force is obtained.
  • the screening system according to the invention can be utilized not only for screening machines in which the screen decks are curved convexly, but also in screening machines with planar decks. In such a case, it is possible, according to a development of the invention, to plastically deform the stiffening elements in a direction opposite to the elastic deformation to which the stiffening elements are subjected during mounting of the screen elements in the screening machine.
  • the screen elements in the screening system of the present invention preferably are formed for overlap jointing at their side edges extending along one another.
  • the screen elements are formed as elongated elements similarto planks.
  • the elements have a length to width ratio of preferably at least 4:1 or, which is even better, at least 5:1.
  • the stiffening elements will lie closer to one another, and thus the total holding-down force will be greater, without it being necessary, upon mounting of the individual elements, to exert an inconveniently greatforce on the free ends of the elements when they are bent down and mounted in the screen frame.
  • Fig. 1 shows a screen element consisting of an elastomer, for instance natural or synthetic rubber, such as polyurethane.
  • the screen element has holes 2 made during the manufacture of the element.
  • Reinforcing or stiffening elements 3 are inserted along the longitudinal sides of the screen element. These reinforcing elements are made of rigid material and may consist of metallic square tubes, as illustrated in the drawings. If necessary, the screen elements may also be reinforced with a suitable number of laid-in stiffening elements 4 extending at right angles to the stiffening or reinforcing elements 3.
  • the screen element is then formed for overlap jointing by being provided with a recess 5 at one long side and an overlap flange 6 at the other long side.
  • Fig. 2 shows an example of a screen frame in a screening machine.
  • the screen frame has side members 7, hold-down ribs 8 and longitudinal supporting elements 9.
  • the side members 7 also are provided with supporting surfaces 10.
  • the supporting surfaces 10 and the supporting elements 9 are mounted at different levels, such that the screen elements 1 will curve upwardly over the supporting elements 9.
  • the screen elements are mounted by clamping their one ends against the supporting surface 10 by means of the hold-down rib 8, whereupon the elements are pressed down over the supporting elements 9 by being subjected to a force in the direction of the arrow 11. Finally, the elements 1 are retained in this elastically deformed position by securing the hold-down rib 8 to the left side in Fig. 2.
  • the present invention thus utilizes the elasticity or spring force provided by the stiffening elements 3 in order to obtain the requisite holding-down action against the supporting elements 9 during the subsequent use of the screening machine.
  • the holding-down action can be very large if an appropriate material is selected for the stiffening elements 3.
  • These elements may consist of, for example, metallic material which is rigid and can be subjected to heavy elastic deformation without surpassing the 0.2% yield strength during mounting.
  • the invention has been utilized in connection with a screening machine with a convexly curved screen deck.
  • the invention may also be utilized with screening machines in which the finished screen deck is planar, in which case the stiffening elements may have been subjected to a plastic predeformation (see Fig. 3) such that the screen elements are curved in a direction opposite to the elastic deformation imparted to them during mounting .
  • this plastic predeformation is illustrated by the arrows 12 which indicate the amount by which the screen elements deviate from a straight line 13.
  • the invention has been described above with reference to a screen frame in which the screening cloth elements extend from one side to the other. However, the invention may be used also with screening machines designed in a different manner, in which the screening deck is divided into two or more juxtaposed areas, as shown in - Fig. 4.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Vehicle Body Suspensions (AREA)
  • Eye Examination Apparatus (AREA)
  • Transplanting Machines (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)
  • Surgical Instruments (AREA)
  • Bidet-Like Cleaning Device And Other Flush Toilet Accessories (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Bipolar Transistors (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Paper (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Claims (5)

1. Système de criblage comprenant un cadre de crible (7) avec des éléments de support (9) pour une surface de criblage disposée dans le cadre, ainsi que des moyens de fixation (8, 10) pour la surface de criblage, laquelle est composée de plusieurs éléments de crible (1) faits d'un élastomère, placés les uns à côtés des autres et possédant des éléments de raidissement (3) qui sont inclus dans les éléments de crible (1) et sont appliqués contre les éléments de support (9), au montage dans le cadre (1), sous une précontrainte produite par une déformation élastique par courbure, caractérisé en ce que les éléments de crible (1) sont montés de manière que leur sens longitudinal soit transversal à la direction de criblage et que le rapport de la longueur à la largeur des éléments de crible (1) est d'au moins 3:1, si bien que la courbure peut être produite sans l'emploi d'un outil spécial.
2. Système selon la revendication 1, caractérisé en ce que le rapport de la longueur à la largeur des éléments de crible (1) est d'au moins 4:1.
3. Système selon la revendication 2, caractérisé en ce que le rapport de la longueur à la largeur des éléments de crible (1) est d'au moins 5:1.
4. Système selon la revendication 1, 2 ou 3, caractérisé en ce que les éléments de raidissement (3) sont montés dans le cadre de crible (7) avec une déformation élastique dont la force de rappel élastique résultante est au moins aussi grande que l'inertie résultante agissant sur la surface de criblage (1) en direction opposée lorsque la surface de criblage est utilisée dans un cribleur dynamique.
5. Système selon l'une quelconque des revendications 1-4, caractérisé en ce que les éléments de crible (1) possèdent des éléments raidisseurs transversaux (4), inclus dans ces éléments et s'étendant à angle droit par rapport aux éléments de raidissement (3).
EP82850244A 1981-12-07 1982-11-29 Système de criblage Expired EP0081471B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82850244T ATE28414T1 (de) 1981-12-07 1982-11-29 Siebsystem.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE8107293 1981-12-07
SE8107293 1981-12-07
SE8201272 1982-03-02
SE8201272A SE428763B (sv) 1981-12-07 1982-03-02 Anordning vid en sikt

Publications (2)

Publication Number Publication Date
EP0081471A1 EP0081471A1 (fr) 1983-06-15
EP0081471B1 true EP0081471B1 (fr) 1987-07-22

Family

ID=26658032

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82850244A Expired EP0081471B1 (fr) 1981-12-07 1982-11-29 Système de criblage

Country Status (11)

Country Link
EP (1) EP0081471B1 (fr)
JP (1) JPS58502040A (fr)
AT (1) ATE28414T1 (fr)
AU (1) AU554492B2 (fr)
CA (1) CA1202602A (fr)
DE (1) DE3276789D1 (fr)
DK (1) DK151461C (fr)
ES (1) ES8308232A1 (fr)
FI (1) FI73901C (fr)
NO (1) NO156438C (fr)
WO (1) WO1983002075A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3628418A1 (de) * 1986-08-21 1988-02-25 Krupp Gmbh Sieb mit auswechselbarem siebbelag
US5586661A (en) * 1994-12-15 1996-12-24 Illinois Tool Works Inc. Dam member for a screen deck
BR9500893A (pt) * 1995-02-24 1997-04-29 Aco Paulista Sa Peneira vibratória modular
US5755334A (en) * 1996-03-19 1998-05-26 Illinois Tool Works Inc. Method and apparatus for mounting a panel on a support member
AUPQ012999A0 (en) * 1999-05-03 1999-05-27 Usf Johnson Screens Pty Ltd Screening equipment
US7922003B2 (en) * 2006-09-29 2011-04-12 M-I L.L.C. Magnetic screen clamping
CN102873025A (zh) * 2012-09-29 2013-01-16 山东润科机电设备有限公司 振动筛
CN113893599B (zh) 2020-07-06 2022-07-01 河北冠能石油机械制造有限公司 用于泥浆振动筛的振动筛筛网
EP4176981A1 (fr) * 2021-11-09 2023-05-10 Steinhaus GmbH Système de fixation de panneau de criblage à positionnement automatique

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2910180A (en) * 1955-03-07 1959-10-27 Tyler Co W S Screen deck structure
NL138604C (fr) * 1968-09-25
JPS4915993Y1 (fr) * 1969-05-16 1974-04-22
JPS5521037B1 (fr) * 1971-03-23 1980-06-06
DE2461237C3 (de) * 1974-12-23 1980-01-24 Hein, Lehmann Ag, 4000 Duesseldorf Spannbarer, elastischer Siebboden
AT344629B (de) * 1976-05-21 1978-08-10 Steinhaus Gmbh Siebfeld
US4120784A (en) * 1976-06-16 1978-10-17 N. Greening Limited Screening apparatus
DE2754374A1 (de) * 1977-12-07 1979-06-13 Kueper Gummi Spannbarer siebboden
DE2932696A1 (de) * 1979-08-11 1981-02-19 Heinz D Gaertner Gmbh Siebboden aus gummi oder kunststoff fuer spann- oder plansiebe
JPS6018525Y2 (ja) * 1979-09-04 1985-06-05 不二サッシ株式会社 引戸戸先の引寄せ装置

Also Published As

Publication number Publication date
DE3276789D1 (en) 1987-08-27
FI831639L (fi) 1983-06-08
DK278683A (da) 1983-06-23
NO831442L (no) 1983-06-23
WO1983002075A1 (fr) 1983-06-23
DK278683D0 (da) 1983-06-16
ATE28414T1 (de) 1987-08-15
EP0081471A1 (fr) 1983-06-15
FI831639A0 (fi) 1983-05-11
FI73901C (fi) 1987-12-10
ES517937A0 (es) 1983-08-16
DK151461C (da) 1988-05-30
ES8308232A1 (es) 1983-08-16
DK151461B (da) 1987-12-07
JPS58502040A (ja) 1983-12-01
CA1202602A (fr) 1986-04-01
AU554492B2 (en) 1986-08-21
NO156438C (no) 1987-09-23
AU1016083A (en) 1983-06-30
FI73901B (fi) 1987-08-31
NO156438B (no) 1987-06-15

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